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Create and verify ANSI X9.31 RSA signatures using OpenSSL libcrypto
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Load OpenSSL libcrypto
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Set up libcrypto argtypes and initialize the library
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Create ANSI X9.31 RSA signatures using OpenSSL libcrypto
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Init an RSAX931Signer instance
:param str keydata: The RSA private key in PEM format
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Sign a message (digest) using the private key
:param str msg: The message (digest) to sign
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:return: The signature, or an empty string if the encryption failed
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Verify ANSI X9.31 RSA signatures using OpenSSL libcrypto
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Init an RSAX931Verifier instance
:param str pubdata: The RSA public key in PEM format
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Recover the message (digest) from the signature using the public key
:param str signed: The signature created with the private key
:rtype: str
:return: The message (digest) recovered from the signature, or an empty
string if the decryption failed
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