I'm trying to convert some PHP code using OpenSSL to Python and I'm stuck
on openssl_sign() which uses an RSA private key to compute a signature.
Example PHP code:
$privkeyid = openssl_get_privatekey($priv_key, $key_pass);
openssl_sign($data, $signature, $privkeyid);
openssl_free_key($privkeyid);
I've tried several permutations of the stuff in M2Crypto.EVP but I can't get
it to work...
The openssl module in PHP basicly does this (C code):
EVP_SignInit(&md_ctx, EVP_sha1());
EVP_SignUpdate(&md_ctx, data, data_len);
EVP_SignFinal(&md_ctx, sigbuf, &siglen, pkey);
Looks like some magic is used to get pkey, I think that's what I'm missing.
See php_openssl_evp_from_zval() in PHP's ext/openssl/openssl.c.
I've tried the following:
key = M2Crypto.EVP.load_key(keyfile, lambda x: passphr)
hmac = M2Crypto.EVP.HMAC(key, 'sha1')
hmac.update(message)
hmac.final()
But this results in:
File "/usr/lib/python2.4/site-packages/M2Crypto/EVP.py", line 39, in
__init__
m2.hmac_init(self.ctx, key, self.md)
TypeError: expected a readable buffer object
Segmentation fault
Unfortunately M2Crypto documentation is practically nonexistent..
Best regards,
--
Konrad
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