Foxit PDF SDK
FSDK.Signature Class Reference
Inheritance diagram for FSDK.Signature:
FSDK.PagingSealSignature

Public Member Functions

 ClearSignedData ()
 Clear the data and appearance if current signature is singed and verified valid. More...
 
 constructor (document, sig_field_dict)
 Constructor, from signature field dictionary. More...
 
 constructor (field)
 Constructor, with parent class object. More...
 
 EnableEmbedFont (enable_embed_font)
 Enable or disable embed font. More...
 
 EnableIncrementalSaveForFirstSigning (enable_incremental_save)
 Enable or disable incremental save for first signing. User should call this function before calling function FSDK.Signature.StartSign.
Default: false. More...
 
 GenerateAppearance ()
 Generate the appearance of unsigned signature. More...
 
 GetAppearanceFlags ()
 Get signature appearance flags. More...
 
 GetBitmap ()
 Get a bitmap which is used for the signature appearance. More...
 
 GetByteRangeArray (out_byte_range_array:[number, number, number, number])
 Get the byte ranges data, including 4 elements. More...
 
 GetCert (index)
 Get a certificate from current signature's certificate chain by index. More...
 
 GetCertCount ()
 Get the count of certificates in current signature's certificate chain. More...
 
 GetCertificateInfo (key)
 Get certificate information. More...
 
 GetDocPermission ()
 Get document permission for current signature. More...
 
 GetDocument ()
 Get the PDF document, which current signature belongs to. More...
 
 GetFieldMDPAction ()
 Get FieldMDP("MDP" means modification detection and prevention) action type. More...
 
 GetFieldMDPActionFields ()
 Get the field name array which is used for FieldMDP action. More...
 
 GetFilter ()
 Get filter. More...
 
 GetKeyLabel (label_name)
 Get the string for specified key label. More...
 
 GetKeyValue (key)
 Get the string value for specified key name. More...
 
 GetPAdESLevel ()
 Get PAdES level. More...
 
 GetPagingSealGroupElements ()
 Get the group elements of current paging seal signature. More...
 
 GetPagingSealSignature ()
 Get the paging seal signature. More...
 
 GetSignatureDict ()
 Get signature dictionary. More...
 
 GetSignatureType ()
 Get signature type. More...
 
 GetSignedVersionDocument (file_path)
 Get the PDF document in the signed version in which current signature was signed. More...
 
 GetSignTime ()
 Get time of signing. More...
 
 GetState ()
 Get current state. More...
 
 GetSubFilter ()
 Get sub filter. More...
 
 IsEmpty ()
 Check whether current object is empty or not. More...
 
 IsSigned ()
 Check whether current signature is signed or not. More...
 
 IsTimeStamp ()
 Check if current signature is a time stamp signature. More...
 
 SetAppearanceContent (appearance_content)
 Set customized appearance content (as low level drawing operation commands) for signed signature appearance. More...
 
 SetAppearanceFlags (appearance_flags)
 Set signature appearance flags. More...
 
 SetBitmap (bitmap)
 Set a bitmap for the signature appearance. More...
 
 SetCertChain (cert_chain)
 Set a certificate chain. More...
 
 SetCustomObject (key, pdf_object)
 Set custom PDF object for signature dictionary. More...
 
 SetDefaultContentsLength (default_length)
 Set the default length of signature contents which represents signature value (known as signed data). More...
 
 SetDocPermission (permission)
 Set document permission for current signature. More...
 
 SetFieldMDPActionFields (action, field_array)
 Set FieldMDP("MDP" means modification detection and prevention) action names array. More...
 
 SetFilter (filter)
 Set filter. More...
 
 SetImage (file_path, frame_index)
 Set an image for the signature appearance, with a specified frame index. More...
 
 SetImage (image, frame_index)
 Set an image for the signature appearance, with a specified frame index. More...
 
 SetKeyLabel (label_name, label_value)
 Set the string for specified key label. More...
 
 SetKeyValue (key, value)
 Set the string value for specified key name. More...
 
 SetSignTime (sign_time)
 Set time of signing. More...
 
 SetSubFilter (sub_filter)
 Set sub filter. More...
 
 StartSign (cert_file_stream, cert_password, digest_algorithm, save_path, client_data, pause)
 Start signing current signature if current signature is unsigned. More...
 
 StartSign (cert_path, cert_password, digest_algorithm, save_path, client_data, pause)
 Start signing current signature if current signature is unsigned. More...
 
 StartSign (cert_path, cert_password, digest_algorithm, stream_callback, client_data, pause)
 Start signing current signature if current signature is unsigned. More...
 
 StartVerify (client_data, pause)
 Start verifying the intergrity of current signature if current signature is signed. More...
 

Public Attributes

 e_StateVerifyNoSupportWay
 Unsupported signature.
 

Static Public Attributes

static e_APFlagBitmap
 If set, show bitmap on signature appearance.
 
static e_APFlagDN
 If set, show distinguish name on signature appearance.
 
static e_APFlagFoxitEditorFlag
 If set, show Foxit Editor content on signature appearance.
 
static e_APFlagFoxitFlag
 Enumeration for signature appearance flags. More...
 
static e_APFlagLabel
 If set, show label on signature appearance.
 
static e_APFlagLocation
 If set, show location on signature appearance.
 
static e_APFlagProducer
 If set, show producer content on signature appearance.
 
static e_APFlagReason
 If set, show reason on signature appearance.
 
static e_APFlagSigner
 If set, show signer on signature appearance.
 
static e_APFlagSigningTime
 If set, show signing time on signature appearance.
 
static e_APFlagText
 If set, show text content on signature appearance.
 
static e_DigestSHA1
 Enumeration for signature digest algorithm. More...
 
static e_DigestSHA256
 Signature digest algorithm: sha256 algorithm.
 
static e_DigestSHA384
 Signature digest algorithm: sha384 algorithm.
 
static e_DigestSHA512
 Signature digest algorithm: sha512 algorithm.
 
static e_DocPermFillingFormAndSigning
 Permitted changes are filling in forms, instantiating page templates, and signing. Other changes will invalidate the signature.
 
static e_DocPermFillingFormSigningAndAnnotating
 Permitted changes are the same as for 2, as well as annotation creation, deletion, and modification. Other changes will invalidate the signature.
 
static e_DocPermNoChangesAllowed
 No changes to the PDF document (which is signed by the signture) are permitted. Any change to this kind of PDF document will invalidate the signature.
 
static e_DocPermUnrestricted
 Enumeration for signature document permission. More...
 
static e_FieldMDPActionAll
 All form fields' flags will be set read-only.
 
static e_FieldMDPActionExclude
 Flags of form fields (except specified form fields) will be set read-only. More...
 
static e_FieldMDPActionInclude
 Specified form fields' flags will be set read-only. More...
 
static e_FieldMDPActionNone
 Enumeration for signature FieldMDP("MDP" means modification detection and prevention) action type. More...
 
static e_KeyNameContactInfo
 Signature key name: contact information.
 
static e_KeyNameDN
 Signature key name: distinguish name.
 
static e_KeyNameLocation
 Signature key name: location.
 
static e_KeyNameProducer
 Signature key name: producer content.
 
static e_KeyNameReason
 Signature key name: reason.
 
static e_KeyNameSigner
 Enumeration for signature key name. More...
 
static e_KeyNameText
 Signature key name: text content.
 
static e_LabelNameDN
 Signature key name for distinguish name. More...
 
static e_LabelNameLocation
 Signature label name for location. More...
 
static e_LabelNameProducer
 Signature key name for producer name. More...
 
static e_LabelNameReason
 Signature label name for reason. More...
 
static e_LabelNameSigner
 Enumeration for signature label name. More...
 
static e_LabelNameSignTime
 Signature label name for sign time. More...
 
static e_PAdESLevelBB
 PAdES level: B-B.
 
static e_PAdESLevelBLT
 PAdES level: B-LT.
 
static e_PAdESLevelBLTA
 PAdES level: B-LTA.
 
static e_PAdESLevelBT
 PAdES level: B-T.
 
static e_PAdESLevelNone
 PAdES level: none.
 
static e_PAdESLevelNotPAdES
 Enumeration for PAdES level. More...
 
static e_SignatureTypeOrdinary
 Enumeration for signature type. More...
 
static e_SignatureTypePagingSeal
 Signature type: paging seal.
 
static e_SignatureTypeTimeStamp
 Signature type: time stamp.
 
static e_StateCertCannotGetVRI
 Cannot get verify relevant information.
 
static e_StateNoSignData
 Signature does not have any data for signing.It means that there is not "V" entry in the signature dictionary.
 
static e_StateSigned
 Signed signature.
 
static e_StateUnknown
 Enumeration for signature states. More...
 
static e_StateUnsigned
 Unsigned signature.
 
static e_StateVerifyChange
 The document has been changed within the scope of the signature. (This indicates that signature is invalid.)
 
static e_StateVerifyChangeIllegal
 The document has been changed outside of signature scope, and the changed invalidate the signature.
 
static e_StateVerifyChangeLegal
 The document has been changed outside of signature scope, but the changed is permitted.
 
static e_StateVerifyErrorByteRange
 Non expected byte range.
 
static e_StateVerifyErrorData
 Signature data is destroyed (that means the signature data cannot be parsed properly).
 
static e_StateVerifyIncredible
 Signature cannot be trusted (containing aggression).
 
static e_StateVerifyInvalid
 Verification state of a signature is invalid.
 
static e_StateVerifyIssueCurrent
 The verified issue is current issuer.
 
static e_StateVerifyIssueExpire
 Certificate for verifying issuer is expired.
 
static e_StateVerifyIssueRevoke
 Certificate for verifying issuer is revoked.
 
static e_StateVerifyIssueUncheck
 Not check the issuer.
 
static e_StateVerifyIssueUnknown
 Verification state of the issuer is unknown.
 
static e_StateVerifyIssueValid
 Verification state of the issuer is valid.
 
static e_StateVerifyNoChange
 The document has not been changed within the scope of the signature.
 
static e_StateVerifyTimestampDoc
 The signature is a time stamp signature.
 
static e_StateVerifyTimestampExpire
 Verification state of the time stamp is expired.
 
static e_StateVerifyTimestampInvalid
 Verification state of the time stamp is invalid.
 
static e_StateVerifyTimestampIssueUnknown
 Verification state of the time stamp issuer is unknown.
 
static e_StateVerifyTimestampIssueValid
 Verification state of the time stamp issuer is valid.
 
static e_StateVerifyTimestampNone
 No time stamp or not check time stamp.
 
static e_StateVerifyTimestampTimeBefore
 Verification state of the time stamp time is valid, since the times is before the expiration date.
 
static e_StateVerifyTimestampValid
 Verification state of the time stamp is valid.
 
static e_StateVerifyValid
 Verification state of a signature is valid.
 

Detailed Description

A digital signature (PDF 1.3) can be used to authenticate the identity of a user and the document's contents. It stores information about the signer and the state of the document when it was signed. The signature is contained in a signature field, as a type of form field, so class FSDK.Signature is derived from class FSDK.Field. A signature object can be retrieved/added by following functions:

In a signature, filter and sub filter keys are used to specify the filter and sub filter of signature callback object which will be used to sign and verify the signature. Foxit PDF SDK has default signature callbacks for following filter and sub filter:

  • filter: "Adobe.PPKLite" and sub filter: "adbe.pkcs7.detached"
  • filter: "Adobe.PPKLite" and sub filter: "adbe.pkcs7.sha1"
  • filter: "Adobe.PPKLite" and sub filter: "ETSI.CAdES.detached"
  • filter: "Adobe.PPKLite" and sub filter: "ETSI.RFC3161"

For sub filter "ETSI.CAdES.detached" and sub filter "ETSI.RFC3161", please ensure a default time stmap server has been set to FSDK.TimeStampServerMgr if default signature callbacks for them will be used to do signing. For other filter and sub filter or if user wants to use customized signature callback for above filter and sub filter, user should prepare customized signature callback and register the callback to Foxit PDF SDK by function FSDK.Library.RegisterSignatureCallback.
This class offers functions to get/set signature information/properties, sign or verify a signature, and so on. For example:

  • To sign an unsigned signature, please use functions FSDK.Signature.StartSign. When signing a signature successfully, user is strongly recommended to close current document and then open the signed PDF document and then do following operation.
  • To verify the integrity of a signed signature, please use functions FSDK.Signature.StartVerify. To check if a signed signature is valid or not, please refer to class FSDK.LTVVerifier.
  • To retrieve signature dictionary directly, please use function FSDK.Signature.GetSignatureDict.

Before signing an unsigned signature, user can call following functions to set information for signing and signed appearance:

If an unsigned signature has been set some information for signing, but the document is saved directly or closed without signing the signature, these data (including filter and sub filter) will be lost in the saved document or in the closed document. When the document is opened again, the unsigned signature needs to be specified at least filter and sub filter for signing; otherwise, this signature cannot be signed.

See also
FSDK.Field
FSDK.Form
FSDK.PDFDoc
FSDK.PDFPage
FSDK.TimeStampServerMgr
FSDK.LTVVerifier

Member Function Documentation

◆ ClearSignedData()

FSDK.Signature.ClearSignedData ( )

Clear the data and appearance if current signature is singed and verified valid.

This function is used for a signed and valid signature.
Attention: From 7.0, this function is only used to verify the intergrity of a signature. To check if a signature is valid or not, please refer to class FSDK.LTVVerifier.

Returns
true means clear the data and appearance successfully, while false means no need to clear data and appearance or any error.

◆ constructor() [1/2]

FSDK.Signature.constructor ( document  ,
sig_field_dict   
)

Constructor, from signature field dictionary.

Parameters
[in]documentA valid PDF document.
[in]sig_field_dictA PDF dictionary which represents a signature field. It should belong to the PDF document specified by parameter document;

◆ constructor() [2/2]

FSDK.Signature.constructor ( field  )

Constructor, with parent class object.

Parameters
[in]fieldParent class object.

◆ EnableEmbedFont()

FSDK.Signature.EnableEmbedFont ( enable_embed_font  )

Enable or disable embed font.

Parameters
enable_embed_fontA flag indicates that whether to embed font for siganture's text. true means that embed font for siganture's text. false means that not to embed font for siganture's text.
Returns
None.

◆ EnableIncrementalSaveForFirstSigning()

FSDK.Signature.EnableIncrementalSaveForFirstSigning ( enable_incremental_save  )

Enable or disable incremental save for first signing. User should call this function before calling function FSDK.Signature.StartSign.
Default: false.

Parameters
[in]enable_incremental_saveA flag indicates that whether to use incremental save for first signing. true means that use incremental save for first signing. false means that use default save for first signing.
Returns
None.

◆ GenerateAppearance()

FSDK.Signature.GenerateAppearance ( )

Generate the appearance of unsigned signature.

This function is used to display the unsigned ordinary signature on page without calling the function FSDK.Signature.StartSign.

Returns
true means success, while false means failure.

◆ GetAppearanceFlags()

FSDK.Signature.GetAppearanceFlags ( )

Get signature appearance flags.

Signature appearance flags indicate which information will be shown. Currently, this is only useful after FSDK.Signature.SetAppearanceFlags is set successfully. For a signature gotten from PDF document, the return value of this function would be useless.

Returns
Signature appearance flags. Please refer to values starting from FSDK.Signature.e_APFlagFoxitFlag and this would be one or a combination of these values.

◆ GetBitmap()

FSDK.Signature.GetBitmap ( )

Get a bitmap which is used for the signature appearance.

Returns
The bitmap used in appearance. If the return value of function FSDK.Bitmap.IsEmpty for the returned bitmap object is true, that means no bitmap is used in appearance or there is any error.

◆ GetByteRangeArray()

FSDK.Signature.GetByteRangeArray ( out_byte_range_array:  [number, number, number, number])

Get the byte ranges data, including 4 elements.

This function is used for a signed signature to retrieve its byte range for digest calculation. The array of byte ranges contains 4 elements. These 4 elements are always in pairs of integers (starting byte offset, length in bytes), describing the exact byte range for the digest calculation.
Please refer to <PDF Reference 1.7> Section 8.7 Digital Signatures for more details.

Parameters
[out]out_byte_range_arrayOutput parameter that receives data of byte ranges. Please ensure this array can contain 4 elements.
Returns
true means success, while false means failure.

◆ GetCert()

FSDK.Signature.GetCert ( index  )

Get a certificate from current signature's certificate chain by index.

This function is recommended to be used before verifying a signature. When sub filter of current signature is "adbe.x509.rsa_sha1", application needs to call this function to get verified public certificate before verifying signature. The first certificate in certificate chain is the signing certificate, and it can be used to verify the signature.

Parameters
[in]indexThe index of certificate to be gotten. Valid range: from 0 to (count-1). count is returned by function FSDK.Signature.GetCertCount.
Returns
A certificate.

◆ GetCertCount()

FSDK.Signature.GetCertCount ( )

Get the count of certificates in current signature's certificate chain.

This function is recommended to be used before verifying a signature. When sub filter of current signature is "adbe.x509.rsa_sha1", application needs to call this function to get the count of certificates in certificate chain and then call function FSDK.Signature.GetCert to get verified public certificate before verifying signature.

Returns
The count of certificates.

◆ GetCertificateInfo()

FSDK.Signature.GetCertificateInfo ( key  )

Get certificate information.

This function is used for a signed signature. Currently, this function only supports for iOS and android platform.

Parameters
[in]keyCertificate key string. Currently it can be one of the following keys:
  • "SerialNumber"
  • "Issuer"
  • "Subject"
  • "ValidPeriodFrom"
  • "ValidPeriodTo"
Returns
Certificate information string.
Note
For "ValidPeriodFrom" or "ValidPeriodTo" key, timezone value will not be computed in.

◆ GetDocPermission()

FSDK.Signature.GetDocPermission ( )

Get document permission for current signature.

Returns
The document permission.Please refer to values starting from FSDK.Signature.e_DocPermUnrestricted and this should be one of these values.

◆ GetDocument()

FSDK.Signature.GetDocument ( )

Get the PDF document, which current signature belongs to.

Returns
A PDF document object.

◆ GetFieldMDPAction()

FSDK.Signature.GetFieldMDPAction ( )

Get FieldMDP("MDP" means modification detection and prevention) action type.

Returns
FieldMDP action type. Please refer to values starting from FSDK.Signature.e_FieldMDPActionNone and this should be one of these values.

◆ GetFieldMDPActionFields()

FSDK.Signature.GetFieldMDPActionFields ( )

Get the field name array which is used for FieldMDP action.

Returned field name array is associated to the FieldMDP action (which can be checked by function FSDK.Signature.GetFieldMDPAction):

Returns
FieldMDP action field name array.

◆ GetFilter()

FSDK.Signature.GetFilter ( )

Get filter.

Filter and sub filter are used to specify which registered signature callback object will be used to sign/verify current signature.

Returns
Filter string.

◆ GetKeyLabel()

FSDK.Signature.GetKeyLabel ( label_name  )

Get the string for specified key label.

If current signature is a time stamp signature, this function will always return an empty string.

Parameters
[in]label_nameKey label. Please refer to values starting from FSDK.Signature.e_LabelNameSigner and this should be one of these values.
Returns
String for specified key label.

◆ GetKeyValue()

FSDK.Signature.GetKeyValue ( key  )

Get the string value for specified key name.

This function is used to get string value of some key in signature dictionary, such as "Reason", "Location" and so on. Specially,

Parameters
[in]keyKey name. Please refer to values starting from FSDK.Signature.e_KeyNameSigner and this should be one of these values.
Returns
The string value.

◆ GetPAdESLevel()

FSDK.Signature.GetPAdESLevel ( )

Get PAdES level.

Returns
PAdES level. Please refer to values starting from FSDK.Signature.e_PAdESLevelNotPAdES and this would be one of these values.

◆ GetPagingSealGroupElements()

FSDK.Signature.GetPagingSealGroupElements ( )

Get the group elements of current paging seal signature.

If current signature type is FSDK.Signature.e_SignatureTypePagingSeal, this function will return the array of signature associated with current signature. Otherwise, an empty array will be returned.

Returns
A signature array.

◆ GetPagingSealSignature()

FSDK.Signature.GetPagingSealSignature ( )

Get the paging seal signature.

If current signature type is FSDK.Signature.e_SignatureTypePagingSeal, this function will return the paging seal signature object associated with current signature.

Returns
A FSDK.PagingSealSignature object. If the return value of function FSDK.Signature.IsEmpty for the returned object is true, that means current signature is not paging seal signature.

◆ GetSignatureDict()

FSDK.Signature.GetSignatureDict ( )

Get signature dictionary.

Signature dictionary is a part of signature field dictionary.

Returns
The signature dictionary. If there is any error, this function will return null.

◆ GetSignatureType()

FSDK.Signature.GetSignatureType ( )

Get signature type.

Returns
Signature type. Please refer to values starting from FSDK.Signature.e_SignatureTypeOrdinary and this would be one of these values.

◆ GetSignedVersionDocument()

FSDK.Signature.GetSignedVersionDocument ( file_path  )

Get the PDF document in the signed version in which current signature was signed.

This function is useful when a PDF document has benn signed by serveral signatures and user wants to get the PDF document in which one signature is signed.

Parameters
[in]file_pathThe full path of the original opened PDF document which current signature belongs to. It should not be an empty string.
Returns
A PDF document object in singed version in which current signature was signed. The returned PDF document may represent a differenct PDF document from current PDF document where current signature is retrieved, or is just current PDF document. User should ensure to keep current PDF document object valid when reading or operating signed version document. Please ensure the returned document object has been loaded successfully, before using most functions in class FSDK.PDFDoc.

◆ GetSignTime()

FSDK.Signature.GetSignTime ( )

Get time of signing.

Returns
A date and time object that receives the signing time. If no signing time is found, this function will return a date and time object with all values 0.

◆ GetState()

FSDK.Signature.GetState ( )

Get current state.

  • Before verifying a signature, this function is to get the state about if current signature is signed or if current signature is lack of data for signing.
  • After verifying a signature, this function is to get the verified state – which indicates that the verified signature is signed; if the verified signature is still unsigned, this function will get the unsigned state instead.
Returns
The value of signature state. Please refer to values starting from FSDK.Signature.e_StateUnknown and this would be one or combination of them.
Specially, if the returned state is FSDK.Signature.e_StateNoSignData, that means current signature has no data for signing, and please at least call function FSDK.Signature.SetKeyValue to set necessary filter and sub filter to current signature. Use can also call following functions to set other data for signing and signed appearance before calling function FSDK.Signature.StartSign:

◆ GetSubFilter()

FSDK.Signature.GetSubFilter ( )

Get sub filter.

Filter and sub filter are used to specify which registered signature callback object will be used to sign/verify current signature.

Returns
Sub filter string.

◆ IsEmpty()

FSDK.Signature.IsEmpty ( )

Check whether current object is empty or not.

When the current object is empty, that means current object is useless.

Returns
true means current object is empty, while false means not.

◆ IsSigned()

FSDK.Signature.IsSigned ( )

Check whether current signature is signed or not.

Returns
true means current signature is signed, and false means not.

◆ IsTimeStamp()

FSDK.Signature.IsTimeStamp ( )

Check if current signature is a time stamp signature.

Returns
true means current signature is a time stamp signature, while false means not.

◆ SetAppearanceContent()

FSDK.Signature.SetAppearanceContent ( appearance_content  )

Set customized appearance content (as low level drawing operation commands) for signed signature appearance.

This function can only be used for an unsigned signature before calling function FSDK.Signature.StartSign for the unsigned signature.
Once customized appearance content is set, it will be used as the signed appearance. In this case, appearance flags set by FSDK.Signature.SetAppearanceFlags will be ignored and related informations will not be used in appearance – these information are set by: FSDK.Signature.SetSignTime, FSDK.Signature.SetKeyValue (except filter and sub-filter), FSDK.Signature.SetBitmap, FSDK.Signature.SetImage.
If current signature is a time stamp signature, this function will do nothing.

Parameters
[in]appearance_contentCustomized appearance content. This should be sequence of drawing operation commands to be used for the appearance, for example "10 10 m 20 10 l S". Please refer to <PDF Reference 1.7> P196 for more details.
Returns
None.

◆ SetAppearanceFlags()

FSDK.Signature.SetAppearanceFlags ( appearance_flags  )

Set signature appearance flags.

This function is recommended to be used before calling function FSDK.Signature.StartSign for an unsigned signature.
Signature appearance flags indicate which information will be shown in the signed appearance. If customized appearance content has been set by function FSDK.Signature.SetAppearanceContent, appearance flags will be ignored.
If current signature is a time stamp signature, this function will do nothing.

Parameters
[in]appearance_flagsSignature appearance flags. Please refer to values starting from FSDK.Signature.e_APFlagFoxitFlag and this should be one or a combination of these values.
Returns
None.

◆ SetBitmap()

FSDK.Signature.SetBitmap ( bitmap  )

Set a bitmap for the signature appearance.

This function is recommended to be used before calling function FSDK.Signature.StartSign for an unsigned signature. If customized appearance content has been set by function FSDK.Signature.SetAppearanceContent, the bitmap will not be used in signed appearance.
If current signature is a time stamp signature, this function will do nothing.

Parameters
[in]bitmapA bitmap to be set to the appearance. It should be valid.
Returns
None.

◆ SetCertChain()

FSDK.Signature.SetCertChain ( cert_chain  )

Set a certificate chain.

This function is recommended to be used before signing an unsigned signature. When the signature sub filter is "adbe.x509.rsa_sha1", users need to call this function to set the cert chain to the signature. For other sub filter, this function will return directly without doing anything.

Parameters
[in]cert_chainA string array that represents the certificate chain.
Returns
None.

◆ SetCustomObject()

FSDK.Signature.SetCustomObject ( key  ,
pdf_object   
)

Set custom PDF object for signature dictionary.

This function is recommended to be used before calling function FSDK.Signature.StartSign for an unsigned signature.

Parameters
[in]keyThe key of signature dictionary, whose value element will be set. It should not be an empty string.
[in]pdf_objectA custom FSDK.PDFObject object to be set as the key's value. It should not be null. It can be a direct PDF object or an indirect PDF object.
Returns
None.

◆ SetDefaultContentsLength()

FSDK.Signature.SetDefaultContentsLength ( default_length  )

Set the default length of signature contents which represents signature value (known as signed data).

This function can only be used before function FSDK.Signature.StartSign for an unsigned signature.
Signature contents represent the signature value (known as signed data). When initializing the signature field, the signature contents will be initialized with the default length 7942. When using custom signature callback to sign and verify an unsigned signature, user can call this function to change the default length of signature contents. In this case, user should also ensure that the length of returned signed data in callback function FSDK.SignatureCallback.Sign should not be larger than the default length set by this function.

Parameters
[in]default_lengthThe default length of the signature value (known as signed data), in bytes. It should not be less than 4098.
Returns
None.

◆ SetDocPermission()

FSDK.Signature.SetDocPermission ( permission  )

Set document permission for current signature.

This function is only useful for an unsigned signature. If this function is used for a signed signature, nothing will be done.
Some notes about the permission value:

Parameters
[in]permissionThe document permission. Please refer to values starting from FSDK.Signature.e_DocPermUnrestricted and this should be one of these values.
Returns
None.

◆ SetFieldMDPActionFields()

FSDK.Signature.SetFieldMDPActionFields ( action  ,
field_array   
)

Set FieldMDP("MDP" means modification detection and prevention) action names array.

This function is only useful for an unsigned signature. If this function is used for a signed signature, nothing will be done.
If current signature is signed, this function is invalidate.

Parameters
[in]actionFieldMDP action type.Please refer to values starting from FSDK.Signature.e_FieldMDPActionNone and this should be one of these values.
  • If this value is FSDK.Signature.e_FieldMDPActionNone, that means no FieldMDP action will be used.
  • If this value is FSDK.Signature.e_FieldMDPActionAll, parameter field_array will be ignored and all fields will be included in the object digest (and hence do not permit changes after current signature is signed).
  • If this value is FSDK.Signature.e_FieldMDPActionInclude, that means only flags of form fields specified by parameter field_array will be set read-only and these fields will be included in the object digest (and hence do not permit changes after current signature is signed).
  • If this value is FSDK.Signature.e_FieldMDPActionExclude, that means flags of form fields (except those specified by parameter field_array) will be set read-only and these fields are included in the object digest (and hence do not permit changes after current signature is signed).
[in]field_arrayA field name array used for FieldMDP action.
Returns
None.

◆ SetFilter()

FSDK.Signature.SetFilter ( filter  )

Set filter.

Filter and sub filter are used to specify which registered signature callback object will be used to sign/verify current signature. User could should set filter and sub filter to use default signature callback in Foxit PDF SDK, or use other filter and sub fitler but please ensure that a signature callback object with non-default filter and sub filter should has been registered in Foxit PDF SDK before signing or verifying current signature. Filter and sub filter for default signature callback are:

  • filter: "Adobe.PPKLite" and sub filter: "adbe.pkcs7.detached"
  • filter: "Adobe.PPKLite" and sub filter: "adbe.pkcs7.sha1"
  • filter: "Adobe.PPKLite" and sub filter: "ETSI.CAdES.detached"
  • filter: "Adobe.PPKLite" and sub filter: "ETSI.RFC3161"
Parameters
[in]filterString for filter. It cannot be an empty string.
Returns
None.

◆ SetImage() [1/2]

FSDK.Signature.SetImage ( file_path  ,
frame_index   
)

Set an image for the signature appearance, with a specified frame index.

This function is recommended to be used before calling function FSDK.Signature.StartSign for an unsigned signature. If customized appearance content has been set by function FSDK.Signature.SetAppearanceContent, the image will not be used in signed appearance.
Input image may contain multiple frames, and only one frame of the image can be set to current signature.
If current signature is a time stamp signature, this function will do nothing.

Parameters
[in]file_pathA full path of an existing image file. It should not be an empty string.
[in]frame_indexFrame index. Valid range: from 0 to (count-1). count is returned by function FSDK.Image.GetFrameCount of input image file.
Returns
None.

◆ SetImage() [2/2]

FSDK.Signature.SetImage ( image  ,
frame_index   
)

Set an image for the signature appearance, with a specified frame index.

This function is recommended to be used before calling function FSDK.Signature.StartSign for an unsigned signature. If customized appearance content has been set by function FSDK.Signature.SetAppearanceContent, the image will not be used in signed appearance.
Input image may contain multiple frames, and only one frame of the image can be set to current signature.
If current signature is a time stamp signature, this function will do nothing.

Parameters
[in]imageAn image. One of its frames will be set to current signature. This image contains at least one frame and the image type should not be FSDK.Image.e_Unknown.
[in]frame_indexFrame index. Valid range: from 0 to (count-1). count is returned by function FSDK.Image.GetFrameCount.
Returns
None.

◆ SetKeyLabel()

FSDK.Signature.SetKeyLabel ( label_name  ,
label_value   
)

Set the string for specified key label.

This function is recommended to be used before calling function FSDK.Signature.StartSign for an unsigned signature.
This function is used to set string value for custom label of some key in signature dictionary. If no custom label is set, default labels will be used by Foxit PDF SDK. Please refer to comment of values starting from FSDK.Signature.e_LabelNameSigner for more details.
If current signature is a time stamp signature, this function will do nothing.

Parameters
[in]label_nameKey label. Please refer to values starting from FSDK.Signature.e_LabelNameSigner and this should be one of these values.
[in]label_valueNew string value for key label. If this is an empty string, Foxit PDF SDK will use default label. Please refer to comment of values starting from FSDK.Signature.e_LabelNameSigner for more details.
Returns
None.

◆ SetKeyValue()

FSDK.Signature.SetKeyValue ( key  ,
value   
)

Set the string value for specified key name.

This function is recommended to be used before calling function FSDK.Signature.StartSign for an unsigned signature.
This function is used to set string value of some key in signature dictionary, such as signer, reason, location and so on.
If current signature is a time stamp signature, this function will do nothing.

Parameters
[in]keyKey name. Please refer to values starting from FSDK.Signature.e_KeyNameSigner and this should be one of these values.
[in]valueNew string value.
Returns
None.

◆ SetSignTime()

FSDK.Signature.SetSignTime ( sign_time  )

Set time of signing.

This function is recommended to be used before calling function FSDK.Signature.StartSign for an unsigned signature.

Parameters
[in]sign_timeThe signing time.
Returns
None.

◆ SetSubFilter()

FSDK.Signature.SetSubFilter ( sub_filter  )

Set sub filter.

Filter and sub filter are used to specify which registered signature callback object will be used to sign/verify current signature. User could should set filter and sub filter to use default signature callback in Foxit PDF SDK, or use other filter and sub fitler but please ensure that a signature callback object with non-default filter and sub filter should has been registered in Foxit PDF SDK before signing or verifying current signature. Filter and sub filter for default signature callback are:

  • filter: "Adobe.PPKLite" and sub filter: "adbe.pkcs7.detached"
  • filter: "Adobe.PPKLite" and sub filter: "adbe.pkcs7.sha1"
  • filter: "Adobe.PPKLite" and sub filter: "ETSI.CAdES.detached"
  • filter: "Adobe.PPKLite" and sub filter: "ETSI.RFC3161"
Parameters
[in]sub_filterString for sub filter.
Returns
None.

◆ StartSign() [1/3]

FSDK.Signature.StartSign ( cert_file_stream  ,
cert_password  ,
digest_algorithm  ,
save_path  ,
client_data  ,
pause   
)

Start signing current signature if current signature is unsigned.

This function is used for an unsigned signature. Filter and sub filter keys of current signature specify the name of signature callback object which will be used to sign current signature. So before signing, please ensure current signature has valid filter and sub filter string values. If the filter and sub filter are one of following strings that means to use the default signature callback in Foxit PDF SDK:

  • filter: "Adobe.PPKLite" and sub filter: "adbe.pkcs7.detached"
  • filter: "Adobe.PPKLite" and sub filter: "adbe.pkcs7.sha1"
  • filter: "Adobe.PPKLite" and sub filter: "ETSI.CAdES.detached"
  • filter: "Adobe.PPKLite" and sub filter: "ETSI.RFC3161"

For sub filter "ETSI.CAdES.detached" and sub filter "ETSI.RFC3161", please ensure a default time stmap server has been set to FSDK.TimeStampServerMgr if default signature callbacks for them will be used to do signing. For other filter and sub filter or if user wants to use customized signature callback for above filter and sub filter, please ensure a customized signature callback has been registered to Foxit PDF SDK by function FSDK.Library.RegisterSignatureCallback.
For PDF documents that are compliant with PDF/A specification, FSDK.Library.SetDefaultICCProfilesPath is recommended to be called and enable embeding font by calling FSDK.Signature.EnableEmbedFont before calling current function. It may take a long time to sign a signature, so Foxit PDF SDK uses a progressive process to do this.

Parameters
[in]cert_file_streamA FSDK.StreamCallback object which is implemented by user to access content of a certificate file which will be used for signing. This can be null if not necessary in custom signature callback.
If default signature callback is to be used for signing current signature, a PFX certificate file can be used.
[in]cert_passwordA password string used to open the cert file. If this is an empty string, that means no password is required.
[in]digest_algorithmThe algorithm of message digest for signed data. Please refer to values starting from FSDK.Signature.e_DigestSHA1 and this should be one of these values.
[in]save_pathA full PDF file path for saving the signing result. The signed document would be saved to another PDF file.
[in]client_dataA user-defined object, which will be passed to call back functions in FSDK.SignatureCallback. This is useless if the default callback object will be used to sign current signature. Default value: null.
[in]pausePause object which decides if the signing process needs to be paused. This can be null which means not to pause during the signing process. If this is not null, it should be a valid pause object implemented by user. Default value: null.
Returns
A progressive object. Please check the rate of current progress by function FSDK.Progressive.GetRateOfProgress. If the rate is not 100 yet, call function FSDK.Progressive.Continue to continue the progress until the progress is finished.
Note
This function does not support to save signed PDF document directly to the PDF file which is used to construct the related PDF document of current signature. In order to do so, user is recommended to do as following steps:
Assume that the related PDF document object is constructed from a PDF file named "org.pdf".
  1. Use current function to save the signed result to an temporary file. Here, this temporary file is named as "temp.tmp".
  2. Ensure that the related PDF document object has destructed – which is equal to "close document".
  3. Remove "org.pdf" and rename "temp.tmp" to "org.pdf".
Then user can open the signed PDF document to do other operation.

◆ StartSign() [2/3]

FSDK.Signature.StartSign ( cert_path  ,
cert_password  ,
digest_algorithm  ,
save_path  ,
client_data  ,
pause   
)

Start signing current signature if current signature is unsigned.

This function is used for an unsigned signature. Filter and sub filter keys of current signature specify the name of signature callback object which will be used to sign current signature. So before signing, please ensure current signature has valid filter and sub filter string values. If the filter and sub filter are one of following strings that means to use the default signature callback in Foxit PDF SDK:

  • filter: "Adobe.PPKLite" and sub filter: "adbe.pkcs7.detached"
  • filter: "Adobe.PPKLite" and sub filter: "adbe.pkcs7.sha1"
  • filter: "Adobe.PPKLite" and sub filter: "ETSI.CAdES.detached"
  • filter: "Adobe.PPKLite" and sub filter: "ETSI.RFC3161"

For sub filter "ETSI.CAdES.detached" and sub filter "ETSI.RFC3161", please ensure a default time stmap server has been set to FSDK.TimeStampServerMgr if default signature callbacks for them will be used to do signing. For other filter and sub filter or if user wants to use customized signature callback for above filter and sub filter, please ensure a customized signature callback has been registered to Foxit PDF SDK by function FSDK.Library.RegisterSignatureCallback.
For PDF documents that are compliant with PDF/A specification, FSDK.Library.SetDefaultICCProfilesPath is recommended to be called and enable embeding font by calling FSDK.Signature.EnableEmbedFont before calling current function. It may take a long time to sign a signature, so Foxit PDF SDK uses a progressive process to do this.

Parameters
[in]cert_pathA full path of a certificate file (including file name and extension), which will be used for signing. This can be an empty string if not necessary in custom signature callback. When this file path is not empty, it should be a valid path.
If default signature callback is to be used for signing current signature, this can be a PFX certificate file.
[in]cert_passwordA password string used to open the cert file. If this is an empty string, that means no password is required.
[in]digest_algorithmThe algorithm of message digest for signed data. Please refer to values starting from FSDK.Signature.e_DigestSHA1 and this should be one of these values.
[in]save_pathA full PDF file path for saving the signing result. The signed document would be saved to another PDF file.
[in]client_dataA user-defined object, which will be passed to call back functions in FSDK.SignatureCallback. This is useless if the default callback object will be used to sign current signature. Default value: null.
[in]pausePause object which decides if the signing process needs to be paused. This can be null which means not to pause during the signing process. If this is not null, it should be a valid pause object implemented by user. Default value: null.
Returns
A progressive object. Please check the rate of current progress by function FSDK.Progressive.GetRateOfProgress. If the rate is not 100 yet, call function FSDK.Progressive.Continue to continue the progress until the progress is finished.
Note
This function does not support to save signed PDF document directly to the PDF file which is used to construct the related PDF document of current signature. In order to do so, user is recommended to do as following steps:
Assume that the related PDF document object is constructed from a PDF file named "org.pdf".
  1. Use current function to save the signed result to an temporary file. Here, this temporary file is named as "temp.tmp".
  2. Ensure that the related PDF document object has destructed – which is equal to "close document".
  3. Remove "org.pdf" and rename "temp.tmp" to "org.pdf".
Then user can open the signed PDF document to do other operation.

◆ StartSign() [3/3]

FSDK.Signature.StartSign ( cert_path  ,
cert_password  ,
digest_algorithm  ,
stream_callback  ,
client_data  ,
pause   
)

Start signing current signature if current signature is unsigned.

This function is used for an unsigned signature. Filter and sub filter keys of current signature specify the name of signature callback object which will be used to sign current signature. So before signing, please ensure current signature has valid filter and sub filter string values. If the filter and sub filter are one of following strings that means to use the default signature callback in Foxit PDF SDK:

  • filter: "Adobe.PPKLite" and sub filter: "adbe.pkcs7.detached"
  • filter: "Adobe.PPKLite" and sub filter: "adbe.pkcs7.sha1"
  • filter: "Adobe.PPKLite" and sub filter: "ETSI.CAdES.detached"
  • filter: "Adobe.PPKLite" and sub filter: "ETSI.RFC3161"

For sub filter "ETSI.CAdES.detached" and sub filter "ETSI.RFC3161", please ensure a default time stmap server has been set to FSDK.TimeStampServerMgr if default signature callbacks for them will be used to do signing. For other filter and sub filter or if user wants to use customized signature callback for above filter and sub filter, please ensure a customized signature callback has been registered to Foxit PDF SDK by function FSDK.Library.RegisterSignatureCallback.
For PDF documents that are compliant with PDF/A specification, FSDK.Library.SetDefaultICCProfilesPath is recommended to be called and enable embeding font by calling FSDK.Signature.EnableEmbedFont before calling current function. It may take a long time to sign a signature, so Foxit PDF SDK uses a progressive process to do this.

Parameters
[in]cert_pathA full path of a certificate file (including file name and extension), which will be used for signing. This can be an empty string if not necessary in custom signature callback. When this file path is not empty, it should be a valid path.
If default signature callback is to be used for signing current signature, this can be a PFX certificate file.
[in]cert_passwordA password string used to open the cert file. If this is an empty string, that means no password is required.
[in]digest_algorithmThe algorithm of message digest for signed data. Please refer to values starting from FSDK.Signature.e_DigestSHA1 and this should be one of these values.
[in]stream_callbackA FSDK.StreamCallback object which is implemented by user to save the signing result. The signed document would be saved to another PDF file.
[in]client_dataA user-defined object, which will be passed to call back functions in FSDK.SignatureCallback. This is useless if the default callback object will be used to sign current signature. Default value: null.
[in]pausePause object which decides if the signing process needs to be paused. This can be null which means not to pause during the signing process. If this is not null, it should be a valid pause object implemented by user. Default value: null.
Returns
A progressive object. Please check the rate of current progress by function FSDK.Progressive.GetRateOfProgress. If the rate is not 100 yet, call function FSDK.Progressive.Continue to continue the progress until the progress is finished.
Note
This function does not support to save signed PDF document directly to the PDF file which is used to construct the related PDF document of current signature. In order to do so, user is recommended to do as following steps:
Assume that the related PDF document object is constructed from a PDF file named "org.pdf".
  1. Use current function to save the signed result to an temporary file. Here, this temporary file is named as "temp.tmp".
  2. Ensure that the related PDF document object has destructed – which is equal to "close document".
  3. Remove "org.pdf" and rename "temp.tmp" to "org.pdf".
Then user can open the signed PDF document to do other operation.

◆ StartVerify()

FSDK.Signature.StartVerify ( client_data  ,
pause   
)

Start verifying the intergrity of current signature if current signature is signed.

This function is used for a signed signature. Filter and sub filter keys of current signature specify the name of signature callback object which will be used to verify current signature. So before verifying, please ensure: the necessary signature callback object has been registered by function FSDK.Library.RegisterSignatureCallback. If the filter and sub filter of current signed signature are one of following strings that means to use the default signature callback in Foxit PDF SDK and user does not need to register one for them:

  • filter: "Adobe.PPKLite" and sub filter: "adbe.pkcs7.detached"
  • filter: "Adobe.PPKLite" and sub filter: "adbe.pkcs7.sha1"
  • filter: "Adobe.PPKLite" and sub filter: "ETSI.CAdES.detached"
  • filter: "Adobe.PPKLite" and sub filter: "ETSI.RFC3161"

It may take a long time to verify a signature, so Foxit PDF SDK uses a progressive process to do this.
From 7.0, this function is only used to verify the intergrity of a signature. To check if a signature is valid or not, please refer to class FSDK.LTVVerifier.

Parameters
[in]client_dataA user-defined object, which will be passed to call back functions in FSDK.SignatureCallback. This is useless if the default callback object will be used to verify current signature. Default value: null.
[in]pausePause object which decides if the verifying process needs to be paused. This can be null which means not to pause during the verifying process. If this is not null, it should be a valid pause object implemented by user. Default value: null.
Returns
A progressive object. Please check the rate of current progress by function FSDK.Progressive.GetRateOfProgress. If the rate is not 100 yet, call function FSDK.Progressive.Continue to continue the progress until the progress is finished.

Member Data Documentation

◆ e_APFlagFoxitFlag

FSDK.Signature.e_APFlagFoxitFlag
static

Enumeration for signature appearance flags.

Values of this enumeration can be used alone or in combination.

If set, show Foxit flag on signature appearance.

◆ e_DigestSHA1

FSDK.Signature.e_DigestSHA1
static

Enumeration for signature digest algorithm.

Values of this enumeration should be used alone.

Signature digest algorithm: sha1 algorithm.

◆ e_DocPermUnrestricted

FSDK.Signature.e_DocPermUnrestricted
static

Enumeration for signature document permission.

Values of this enumeration should be used alone.

No restriction.

◆ e_FieldMDPActionExclude

FSDK.Signature.e_FieldMDPActionExclude
static

Flags of form fields (except specified form fields) will be set read-only.

Note
"Specified form fields" can be get/set by functions FSDK.Signature.GetFieldMDPActionFields and FSDK.Signature.SetFieldMDPActionFields. Please refer to these functions for more details.

◆ e_FieldMDPActionInclude

FSDK.Signature.e_FieldMDPActionInclude
static

Specified form fields' flags will be set read-only.

Note
"Specified form fields" can be get/set by functions FSDK.Signature.GetFieldMDPActionFields and FSDK.Signature.SetFieldMDPActionFields. Please refer to these functions for more details.

◆ e_FieldMDPActionNone

FSDK.Signature.e_FieldMDPActionNone
static

Enumeration for signature FieldMDP("MDP" means modification detection and prevention) action type.

Values of this enumeration should be used alone.

No Field MDP action.

◆ e_KeyNameSigner

FSDK.Signature.e_KeyNameSigner
static

Enumeration for signature key name.

Values of this enumeration should be used alone.

Signature key name: signer.

◆ e_LabelNameDN

FSDK.Signature.e_LabelNameDN
static

Signature key name for distinguish name.

Note
Default label name for distinguish name is "DN: " in Foxit PDF SDK.

◆ e_LabelNameLocation

FSDK.Signature.e_LabelNameLocation
static

Signature label name for location.

Note
Default label name for location is "Location: " in Foxit PDF SDK.

◆ e_LabelNameProducer

FSDK.Signature.e_LabelNameProducer
static

Signature key name for producer name.

Note
Default label name for producer name is empty in Foxit PDF SDK.

◆ e_LabelNameReason

FSDK.Signature.e_LabelNameReason
static

Signature label name for reason.

Note
Default label name for reason is "Reason: " in Foxit PDF SDK.

◆ e_LabelNameSigner

FSDK.Signature.e_LabelNameSigner
static

Enumeration for signature label name.

Values of this enumeration should be used alone.

Signature label name for signer.

Note
Default label name for signer is "Digitally signed by " in Foxit PDF SDK.

◆ e_LabelNameSignTime

FSDK.Signature.e_LabelNameSignTime
static

Signature label name for sign time.

Note
Default label name for sign time is "Date: " in Foxit PDF SDK.

◆ e_PAdESLevelNotPAdES

FSDK.Signature.e_PAdESLevelNotPAdES
static

Enumeration for PAdES level.

Values of this enumeration should be used alone.

Not a PAdES signature.

◆ e_SignatureTypeOrdinary

FSDK.Signature.e_SignatureTypeOrdinary
static

Enumeration for signature type.

Values of this enumeration should be used alone.

Signature type: ordinary.

◆ e_StateUnknown

FSDK.Signature.e_StateUnknown
static

Enumeration for signature states.

Values of this enumeration can be used alone or in combination.
These values can be divided into four parts:

Unknown signature.