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add support of p7s files #163

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@d1vory d1vory commented Oct 12, 2023

Added support of signed files, that come in format of .p7s. Magic bytes for recognizing were taken from go library

bytearray([0x30, 0x83]), bytearray([0x30, 0x84])
]
signed_data_match = bytearray([0x06, 0x09, 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01, 0x07])
for i, match in enumerate(start_header):
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there is parsed ASN1 file which may be a different length. Check possibly samples here: https://lapo.it/asn1js/
full OID may be checked too for x30:x82:
contentType ContentType OBJECT IDENTIFIER 1.2.840.113549.1.7.2 signedData (PKCS #7)

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