DigitalSignatureCollection class
DigitalSignatureCollection class
Provides a read-only collection of digital signatures attached to a document. To learn more, visit the Work with Digital Signatures documentation article.
Remarks
Constructors
| Name | Description |
|---|---|
| DigitalSignatureCollection() | The default constructor. |
Indexers
| Name | Description |
|---|---|
__getitem__(index) | Gets a document signature at the specified index. |
Properties
| Name | Description |
|---|---|
| count | Gets the number of elements contained in the collection. |
| is_valid | Returns True if all digital signatures in this collection are valid and the document has not been tampered with Also returns True if there are no digital signatures. Returns False if at least one digital signature is invalid. |
Examples
Shows how to validate and display information about each signature in a document.
doc = aw.Document(MY_DIR + "Digitally signed.docx")
for signature in doc.digital_signatures:
print(f"\n{'Valid' if signature.is_valid else 'Invalid'} signature: ")
print(f"\tReason:\t{signature.comments}")
print(f"\tType:\t{signature.signature_type}")
print(f"\tSign time:\t{signature.sign_time}")
# System.Security.Cryptography.X509Certificates.X509Certificate2 is not supported. That is why the following information is not accesible.
#print(f"\tSubject name:\t{signature.certificate_holder.certificate.subject_name}")
#print(f"\tIssuer name:\t{signature.certificate_holder.certificate.issuer_name.name}")
print()
Shows how to sign documents with X.509 certificates.
# Verify that a document is not signed.
self.assertFalse(aw.FileFormatUtil.detect_file_format(MY_DIR + "Document.docx").has_digital_signature)
# Create a CertificateHolder object from a PKCS12 file, which we will use to sign the document.
certificate_holder = aw.digitalsignatures.CertificateHolder.create(MY_DIR + "morzal.pfx", "aw", None)
# There are two ways of saving a signed copy of a document to the local file system:
# 1 - Designate a document by a local system filename and save a signed copy at a location specified by another filename.
sign_options = aw.digitalsignatures.SignOptions()
sign_options.sign_time = datetime.utcnow()
aw.digitalsignatures.DigitalSignatureUtil.sign(
MY_DIR + "Document.docx", ARTIFACTS_DIR + "Document.digital_signature.docx",
certificate_holder, sign_options)
self.assertTrue(aw.FileFormatUtil.detect_file_format(ARTIFACTS_DIR + "Document.digital_signature.docx").has_digital_signature)
# 2 - Take a document from a stream and save a signed copy to another stream.
with open(MY_DIR + "Document.docx", "rb") as in_doc:
with open(ARTIFACTS_DIR + "Document.digital_signature.docx", "wb") as out_doc:
aw.digitalsignatures.DigitalSignatureUtil.sign(in_doc, out_doc, certificate_holder)
self.assertTrue(aw.FileFormatUtil.detect_file_format(ARTIFACTS_DIR + "Document.digital_signature.docx").has_digital_signature)
# Please verify that all of the document's digital signatures are valid and check their details.
signed_doc = aw.Document(ARTIFACTS_DIR + "Document.digital_signature.docx")
digital_signature_collection = signed_doc.digital_signatures
self.assertTrue(digital_signature_collection.is_valid)
self.assertEqual(1, digital_signature_collection.count)
self.assertEqual(aw.digitalsignatures.DigitalSignatureType.XML_DSIG, digital_signature_collection[0].signature_type)
self.assertEqual("CN=Morzal.Me", signed_doc.digital_signatures[0].issuer_name)
self.assertEqual("CN=Morzal.Me", signed_doc.digital_signatures[0].subject_name)