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Documents. It also provides a basic default RevocationCallback which is required by LTVVerifier.Following lists an example about how to establish long term validation of signatures using the default signature callback for subfilter “ETSI.RFC3161” and the default RevocationCallback. For more details, please refer to the simple demo “ltv” in the “\examples\simple_demo” folder of the download package.Example:How to establish long term validation of signatures using the default signature callback for subfilter “ETSI.RFC3161” and the default RevocationCallbackimport sysimport siteif sys.version_info.major == 2:_PYTHON2_ = Trueelse:_PYTHON2_ = Falseif _PYTHON2_:#replace with the python2 lib pathsite.addsitedir(‘../../../’)from FoxitPDFSDKPython2 import *else:from FoxitPDFSDKPython3 import *…# Implementation of pdf.SignatureCallbackclass SignatureCallbackImpl(SignatureCallback):def __init__(self, *args):if _PYTHON2_:super(SignatureCallbackImpl, self).__init__()else:super().__init__()self.digest_context_ = Noneself.sub_filter_ = args[0]def __del__(self):self.__disown__()def Release(self):passdef GetTextFromFile(self, *args):file_buffer = Noneif self.digest_context_ is None or not self.digest_context_.GetFileReadCallback():return False, Nonefile_read = self.digest_context_.GetFileReadCallback()val, buffer = file_read.ReadBlock((self.digest_context_.GetByteRangeElement(0),self.digest_context_.GetByteRangeElement(1)))file_buffer = bufferval, buffer = file_read.ReadBlock((self.digest_context_.GetByteRangeElement(2),self.digest_context_.GetByteRangeElement(3)))file_buffer += bufferreturn True, file_bufferdef StartCalcDigest(self, *args):file = args[0]byte_range_array = args[1]size_of_array = len(args[1])signature = args[2]client_data = args[3]self.digest_context_ = DigestContext(file, byte_range_array,size_of_array)return self.digest_context_.HashInit()def ContinueCalcDigest(self, *args):try:if self.digest_context_ is None:return Progressive.e_Errorret, file_buffer = self.GetTextFromFile()if not ret:return Progressive.e_Errorself.digest_context_.HashUpdate(file_buffer)return Progressive.e_Finishedexcept Exception as ex:print(ex.GetMessage())return Progressive.e_Errordef GetDigest(self, *args):try:if self.digest_context_ is None:return “”digest = self.digest_context_.HashDigest()return digestexcept Exception as ex:print(ex.GetMessage())return “”def Sign(self, *args):try:digest = args[0][0]digest_length = args[0][1]cert_path = args[1]password = args[2]digest_algorithm = args[3]client_data = args[4]if self.digest_context_ is None:return “”plain_text = “”if “adbe.pkcs7.sha1” == self.sub_filter_:plain_text = digestpk12 = crypto.load_pkcs12(open(cert_path, ‘rb’).read(), password)pkey = pk12.get_privatekey()signcert = pk12.get_certificate()PKCS7_NOSIGS = 0x4bio_in = crypto._new_mem_buf(plain_text)pkcs7 = crypto._lib.PKCS7_sign(signcert._x509, pkey._pkey,crypto._ffi.NULL, bio_in,PKCS7_NOSIGS)bio_out = crypto._new_mem_buf()crypto._lib.i2d_PKCS7_bio(bio_out, pkcs7)signed_data = crypto._bio_to_string(bio_out)return signed_dataexcept Exception as ex:print(ex.GetMessage())return “”def VerifySigState(self, *args):# Usually, the content of a signature field is contain the certification of signer.# But we can’t judge this certification is trusted.# For this example, the signer is ourself. So when using api PKCS7_verify to verify,# we pass NULL to it’s parameter certs.# Meanwhile, if application should specify the certificates, we suggest pass flag PKCS7_NOINTERN to# api PKCS7_verify.if self.digest_context_ is None:return Signature.e_StateVerifyErrorDataplain_text = “”digest = args[0][0]digest_length = args[0][1]signed_data = args[1][0]signed_data_len = args[1][1]client_data = args[2]if “adbe.pkcs7.sha1” != self.sub_filter_:return Signature.e_StateUnknownp7 = crypto.load_pkcs7_data(crypto.FILETYPE_ASN1, signed_data)PKCS7_NOVERIFY = 0x20p7bio = crypto._new_mem_buf(digest)res = crypto._lib.PKCS7_verify(p7._pkcs7, crypto._ffi.NULL,crypto._ffi.NULL, p7bio,crypto._ffi.NULL, PKCS7_NOVERIFY)if res:return Signature.e_StateVerifyNoChangeelse:return Signature.e_StateVerifyChangedef IsNeedPadData(self, *args):return Falsedef CheckCertificateValidity(self, *args):# User can check the validity of input certificate here.# If no need to check, just return e_CertValid.return SignatureCallback.e_CertValidPAdESFoxit PDF SDK also supports PAdES (PDF Advanced Electronic Signature) which is the application for CAdES signature in the field of PDF. CAdES is a new standard for advanced digital signature, its default subfilter is “ETSI.CAdES.detached”. PAdES signature includes four levels: B-B, B-T, B-LT, and B-LTA.B-B: Must include the basic attributes.B-T: Must include document time stamp or signature time stamp to provide trusted time for existing signatures, based on B-B.B-LT: Must include DSS/VRI to provide certificates and revocation information, based on B-T.B-LTA: Must include the trusted time DTS for existing revocation information, based on B-LT.Foxit PDF SDK provides a default signature callback
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Error_code:print(“Fail to open the signed PDF file.\r\n”)return# Get the last signature which is just added and signed.sig_count = signed_pdf_doc.GetSignatureCount()signed_signature = signed_pdf_doc.GetSignature(sig_count – 1)# Verify the intergrity of signature.signed_signature.StartVerify(“”, None)print(“[Verify] Finished!\r\n”)is_signed = signed_signature.IsSigned()sig_state = signed_signature.GetState()print(“[After verifying] Signed?:{}\tState:{}\r\n”.format(“true” if is_signed else “false”,TransformSignatureStateToString(sig_state)))How to implement signature callback function of signingimport sysimport siteif sys.version_info.major == 2:_PYTHON2_ = Trueelse:_PYTHON2_ = Falseif _PYTHON2_:#replace with the python2 lib pathsite.addsitedir(‘../../../’)from FoxitPDFSDKPython2 import *else:from FoxitPDFSDKPython3 import *…# Implementation of pdf.SignatureCallbackclass SignatureCallbackImpl(SignatureCallback):def __init__(self, *args):if _PYTHON2_:super(SignatureCallbackImpl, self).__init__()else:super().__init__()self.digest_context_ = Noneself.sub_filter_ = args[0]def __del__(self):self.__disown__()def Release(self):passdef GetTextFromFile(self, *args):file_buffer = Noneif self.digest_context_ is None or not self.digest_context_.GetFileReadCallback():return False, Nonefile_read = self.digest_context_.GetFileReadCallback()val, buffer = file_read.ReadBlock((self.digest_context_.GetByteRangeElement(0),self.digest_context_.GetByteRangeElement(1)))file_buffer = bufferval, buffer = file_read.ReadBlock((self.digest_context_.GetByteRangeElement(2),self.digest_context_.GetByteRangeElement(3)))file_buffer += bufferreturn True, file_bufferdef StartCalcDigest(self, *args):file = args[0]byte_range_array = args[1]size_of_array = len(args[1])signature = args[2]client_data = args[3]self.digest_context_ = DigestContext(file, byte_range_array,size_of_array)return self.digest_context_.HashInit()def ContinueCalcDigest(self, *args):try:if self.digest_context_ is None:return Progressive.e_Errorret, file_buffer = self.GetTextFromFile()if not ret:return Progressive.e_Errorself.digest_context_.HashUpdate(file_buffer)return Progressive.e_Finishedexcept Exception as ex:print(ex.GetMessage())return Progressive.e_Errordef GetDigest(self, *args):try:if self.digest_context_ is None:return “”digest = self.digest_context_.HashDigest()return digestexcept Exception as ex:print(ex.GetMessage())return “”def Sign(self, *args):try:digest = args[0][0]digest_length = args[0][1]cert_path = args[1]password = args[2]digest_algorithm = args[3]client_data = args[4]if self.digest_context_ is None:return “”plain_text = “”if “adbe.pkcs7.sha1” == self.sub_filter_:plain_text = digestpk12 = crypto.load_pkcs12(open(cert_path, ‘rb’).read(), password)pkey = pk12.get_privatekey()signcert = pk12.get_certificate()PKCS7_NOSIGS = 0x4bio_in = crypto._new_mem_buf(plain_text)pkcs7 = crypto._lib.PKCS7_sign(signcert._x509, pkey._pkey,crypto._ffi.NULL, bio_in,PKCS7_NOSIGS)bio_out = crypto._new_mem_buf()crypto._lib.i2d_PKCS7_bio(bio_out, pkcs7)signed_data = crypto._bio_to_string(bio_out)return signed_dataexcept Exception as ex:print(ex.GetMessage())return “”def VerifySigState(self, *args):# Usually, the content of a signature field is contain the certification of signer.# But we can’t judge this certification is trusted.# For this example, the signer is ourself. So when using api PKCS7_verify to verify,# we pass NULL to it’s parameter certs.# Meanwhile, if application should specify the certificates, we suggest pass flag PKCS7_NOINTERN to# api PKCS7_verify.if self.digest_context_ is None:return Signature.e_StateVerifyErrorDataplain_text = “”digest = args[0][0]digest_length = args[0][1]signed_data = args[1][0]signed_data_len = args[1][1]client_data = args[2]if “adbe.pkcs7.sha1” != self.sub_filter_:return Signature.e_StateUnknownp7 = crypto.load_pkcs7_data(crypto.FILETYPE_ASN1, signed_data)PKCS7_NOVERIFY = 0x20p7bio = crypto._new_mem_buf(digest)res = crypto._lib.PKCS7_verify(p7._pkcs7, crypto._ffi.NULL,crypto._ffi.NULL, p7bio,crypto._ffi.NULL, PKCS7_NOVERIFY)if res:return Signature.e_StateVerifyNoChangeelse:return Signature.e_StateVerifyChangedef IsNeedPadData(self, *args):return Falsedef CheckCertificateValidity(self, *args):# User can check the validity of input certificate here.# If no need to check, just return e_CertValid.return SignatureCallback.e_CertValidLong term validation (LTV)Foxit PDF SDK provides APIs to establish long term validation of signatures, which is mainly used to solve the verification problem of signatures that have already expired. LTV requires DSS (Document Security Store) which contains the verification information of the signatures, as well as DTS (Document Timestamp Signature) which belongs to the type of time stamp signature.In order to support LTV, Foxit PDF SDK provides:Support for adding the signatures of time stamp type, and provides a default signature callback for the subfilter “ETSI.RFC3161”.TimeStampServerMgr and TimeStampServer classes, which are used to set and manager the server for time stamp. The default signature callback for the subfilter “ETSI.RFC3161” will use the default time stamp server.LTVVerifier class which offers the functionalities of verifying signatures and adding DSS information toLa Sabrosona de Zona en Zona - radiosguatemala.com
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Documents. It also provides a basic default RevocationCallback which is required by LTVVerifier.Following lists an example about how to establish long term validation of signatures using the default signature callback for subfilter “ETSI.RFC3161” and the default RevocationCallback. For more details, please refer to the simple demo “ltv” in the “\examples\simple_demo” folder of the download package.Example:How to establish long term validation of signatures using the default signature callback for subfilter “ETSI.RFC3161” and the default RevocationCallbackimport sysimport siteif sys.version_info.major == 2:_PYTHON2_ = Trueelse:_PYTHON2_ = Falseif _PYTHON2_:#replace with the python2 lib pathsite.addsitedir(‘../../../’)from FoxitPDFSDKPython2 import *else:from FoxitPDFSDKPython3 import *…# Implementation of pdf.SignatureCallbackclass SignatureCallbackImpl(SignatureCallback):def __init__(self, *args):if _PYTHON2_:super(SignatureCallbackImpl, self).__init__()else:super().__init__()self.digest_context_ = Noneself.sub_filter_ = args[0]def __del__(self):self.__disown__()def Release(self):passdef GetTextFromFile(self, *args):file_buffer = Noneif self.digest_context_ is None or not self.digest_context_.GetFileReadCallback():return False, Nonefile_read = self.digest_context_.GetFileReadCallback()val, buffer = file_read.ReadBlock((self.digest_context_.GetByteRangeElement(0),self.digest_context_.GetByteRangeElement(1)))file_buffer = bufferval, buffer = file_read.ReadBlock((self.digest_context_.GetByteRangeElement(2),self.digest_context_.GetByteRangeElement(3)))file_buffer += bufferreturn True, file_bufferdef StartCalcDigest(self, *args):file = args[0]byte_range_array = args[1]size_of_array = len(args[1])signature = args[2]client_data = args[3]self.digest_context_ = DigestContext(file, byte_range_array,size_of_array)return self.digest_context_.HashInit()def ContinueCalcDigest(self, *args):try:if self.digest_context_ is None:return Progressive.e_Errorret, file_buffer = self.GetTextFromFile()if not ret:return Progressive.e_Errorself.digest_context_.HashUpdate(file_buffer)return Progressive.e_Finishedexcept Exception as ex:print(ex.GetMessage())return Progressive.e_Errordef GetDigest(self, *args):try:if self.digest_context_ is None:return “”digest = self.digest_context_.HashDigest()return digestexcept Exception as ex:print(ex.GetMessage())return “”def Sign(self, *args):try:digest = args[0][0]digest_length = args[0][1]cert_path = args[1]password = args[2]digest_algorithm = args[3]client_data = args[4]if self.digest_context_ is None:return “”plain_text = “”if “adbe.pkcs7.sha1” == self.sub_filter_:plain_text = digestpk12 = crypto.load_pkcs12(open(cert_path, ‘rb’).read(), password)pkey = pk12.get_privatekey()signcert = pk12.get_certificate()PKCS7_NOSIGS = 0x4bio_in = crypto._new_mem_buf(plain_text)pkcs7 = crypto._lib.PKCS7_sign(signcert._x509, pkey._pkey,crypto._ffi.NULL, bio_in,PKCS7_NOSIGS)bio_out = crypto._new_mem_buf()crypto._lib.i2d_PKCS7_bio(bio_out, pkcs7)signed_data = crypto._bio_to_string(bio_out)return signed_dataexcept Exception as ex:print(ex.GetMessage())return “”def VerifySigState(self, *args):# Usually, the content of a signature field is contain the certification of signer.# But we can’t judge this certification is trusted.# For this example, the signer is ourself. So when using api PKCS7_verify to verify,# we pass NULL to it’s parameter certs.# Meanwhile, if application should specify the certificates, we suggest pass flag PKCS7_NOINTERN to# api PKCS7_verify.if self.digest_context_ is None:return Signature.e_StateVerifyErrorDataplain_text = “”digest = args[0][0]digest_length = args[0][1]signed_data = args[1][0]signed_data_len = args[1][1]client_data = args[2]if “adbe.pkcs7.sha1” != self.sub_filter_:return Signature.e_StateUnknownp7 = crypto.load_pkcs7_data(crypto.FILETYPE_ASN1, signed_data)PKCS7_NOVERIFY = 0x20p7bio = crypto._new_mem_buf(digest)res = crypto._lib.PKCS7_verify(p7._pkcs7, crypto._ffi.NULL,crypto._ffi.NULL, p7bio,crypto._ffi.NULL, PKCS7_NOVERIFY)if res:return Signature.e_StateVerifyNoChangeelse:return Signature.e_StateVerifyChangedef IsNeedPadData(self, *args):return Falsedef CheckCertificateValidity(self, *args):# User can check the validity of input certificate here.# If no need to check, just return e_CertValid.return SignatureCallback.e_CertValidPAdESFoxit PDF SDK also supports PAdES (PDF Advanced Electronic Signature) which is the application for CAdES signature in the field of PDF. CAdES is a new standard for advanced digital signature, its default subfilter is “ETSI.CAdES.detached”. PAdES signature includes four levels: B-B, B-T, B-LT, and B-LTA.B-B: Must include the basic attributes.B-T: Must include document time stamp or signature time stamp to provide trusted time for existing signatures, based on B-B.B-LT: Must include DSS/VRI to provide certificates and revocation information, based on B-T.B-LTA: Must include the trusted time DTS for existing revocation information, based on B-LT.Foxit PDF SDK provides a default signature callback
2025-04-05Error_code:print(“Fail to open the signed PDF file.\r\n”)return# Get the last signature which is just added and signed.sig_count = signed_pdf_doc.GetSignatureCount()signed_signature = signed_pdf_doc.GetSignature(sig_count – 1)# Verify the intergrity of signature.signed_signature.StartVerify(“”, None)print(“[Verify] Finished!\r\n”)is_signed = signed_signature.IsSigned()sig_state = signed_signature.GetState()print(“[After verifying] Signed?:{}\tState:{}\r\n”.format(“true” if is_signed else “false”,TransformSignatureStateToString(sig_state)))How to implement signature callback function of signingimport sysimport siteif sys.version_info.major == 2:_PYTHON2_ = Trueelse:_PYTHON2_ = Falseif _PYTHON2_:#replace with the python2 lib pathsite.addsitedir(‘../../../’)from FoxitPDFSDKPython2 import *else:from FoxitPDFSDKPython3 import *…# Implementation of pdf.SignatureCallbackclass SignatureCallbackImpl(SignatureCallback):def __init__(self, *args):if _PYTHON2_:super(SignatureCallbackImpl, self).__init__()else:super().__init__()self.digest_context_ = Noneself.sub_filter_ = args[0]def __del__(self):self.__disown__()def Release(self):passdef GetTextFromFile(self, *args):file_buffer = Noneif self.digest_context_ is None or not self.digest_context_.GetFileReadCallback():return False, Nonefile_read = self.digest_context_.GetFileReadCallback()val, buffer = file_read.ReadBlock((self.digest_context_.GetByteRangeElement(0),self.digest_context_.GetByteRangeElement(1)))file_buffer = bufferval, buffer = file_read.ReadBlock((self.digest_context_.GetByteRangeElement(2),self.digest_context_.GetByteRangeElement(3)))file_buffer += bufferreturn True, file_bufferdef StartCalcDigest(self, *args):file = args[0]byte_range_array = args[1]size_of_array = len(args[1])signature = args[2]client_data = args[3]self.digest_context_ = DigestContext(file, byte_range_array,size_of_array)return self.digest_context_.HashInit()def ContinueCalcDigest(self, *args):try:if self.digest_context_ is None:return Progressive.e_Errorret, file_buffer = self.GetTextFromFile()if not ret:return Progressive.e_Errorself.digest_context_.HashUpdate(file_buffer)return Progressive.e_Finishedexcept Exception as ex:print(ex.GetMessage())return Progressive.e_Errordef GetDigest(self, *args):try:if self.digest_context_ is None:return “”digest = self.digest_context_.HashDigest()return digestexcept Exception as ex:print(ex.GetMessage())return “”def Sign(self, *args):try:digest = args[0][0]digest_length = args[0][1]cert_path = args[1]password = args[2]digest_algorithm = args[3]client_data = args[4]if self.digest_context_ is None:return “”plain_text = “”if “adbe.pkcs7.sha1” == self.sub_filter_:plain_text = digestpk12 = crypto.load_pkcs12(open(cert_path, ‘rb’).read(), password)pkey = pk12.get_privatekey()signcert = pk12.get_certificate()PKCS7_NOSIGS = 0x4bio_in = crypto._new_mem_buf(plain_text)pkcs7 = crypto._lib.PKCS7_sign(signcert._x509, pkey._pkey,crypto._ffi.NULL, bio_in,PKCS7_NOSIGS)bio_out = crypto._new_mem_buf()crypto._lib.i2d_PKCS7_bio(bio_out, pkcs7)signed_data = crypto._bio_to_string(bio_out)return signed_dataexcept Exception as ex:print(ex.GetMessage())return “”def VerifySigState(self, *args):# Usually, the content of a signature field is contain the certification of signer.# But we can’t judge this certification is trusted.# For this example, the signer is ourself. So when using api PKCS7_verify to verify,# we pass NULL to it’s parameter certs.# Meanwhile, if application should specify the certificates, we suggest pass flag PKCS7_NOINTERN to# api PKCS7_verify.if self.digest_context_ is None:return Signature.e_StateVerifyErrorDataplain_text = “”digest = args[0][0]digest_length = args[0][1]signed_data = args[1][0]signed_data_len = args[1][1]client_data = args[2]if “adbe.pkcs7.sha1” != self.sub_filter_:return Signature.e_StateUnknownp7 = crypto.load_pkcs7_data(crypto.FILETYPE_ASN1, signed_data)PKCS7_NOVERIFY = 0x20p7bio = crypto._new_mem_buf(digest)res = crypto._lib.PKCS7_verify(p7._pkcs7, crypto._ffi.NULL,crypto._ffi.NULL, p7bio,crypto._ffi.NULL, PKCS7_NOVERIFY)if res:return Signature.e_StateVerifyNoChangeelse:return Signature.e_StateVerifyChangedef IsNeedPadData(self, *args):return Falsedef CheckCertificateValidity(self, *args):# User can check the validity of input certificate here.# If no need to check, just return e_CertValid.return SignatureCallback.e_CertValidLong term validation (LTV)Foxit PDF SDK provides APIs to establish long term validation of signatures, which is mainly used to solve the verification problem of signatures that have already expired. LTV requires DSS (Document Security Store) which contains the verification information of the signatures, as well as DTS (Document Timestamp Signature) which belongs to the type of time stamp signature.In order to support LTV, Foxit PDF SDK provides:Support for adding the signatures of time stamp type, and provides a default signature callback for the subfilter “ETSI.RFC3161”.TimeStampServerMgr and TimeStampServer classes, which are used to set and manager the server for time stamp. The default signature callback for the subfilter “ETSI.RFC3161” will use the default time stamp server.LTVVerifier class which offers the functionalities of verifying signatures and adding DSS information to
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