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digital-signaturepython-3.4verifypyopenssl
Brent Douglas
Brent Douglas

Reputation: 41

pyOpenSSL signature verification using Python 3

I am trying to verify a signature using pyOpenSSL with Python 3.4.2. Here is my code.

from OpenSSL import crypto

some_byte_string = b'This is a byte string.'
crt = crypto.load_certificate(crypto.FILETYPE_PEM, pem)

# self.signature is a base64 encoded string
crypto.verify(crt, self.signature, some_byte_string, 'sha1')

That produces the following exception:

verify_result = _lib.EVP_VerifyFinal(md_ctx, signature, len(signature), pkey)
TypeError: initializer for ctype 'unsigned char *' must be a bytes or list or tuple, not str

I have also tried using a regular string for 'some_byte_string' but I get the following exception when I try that:

_lib.EVP_VerifyUpdate(md_ctx, data, len(data))
TypeError: initializer for ctype 'void *' must be a cdata pointer, not str

I saw a previous SO question that referenced the unittest for pyOpenSSL verify and this appears to be what I am doing though obviously something is wrong.

Edit: Forgot to mention the version of pyOpenSSL I am using is pyOpenSSL-0.14-py3.4.

Upvotes: 3

Views: 1773

Answers (1)

Brent Douglas
Brent Douglas

Reputation: 41

Apparently it's a bug with 0.14 and will be fixed in 0.15.

https://github.com/pyca/pyopenssl/issues/15

Upvotes: 1

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