Created
April 5, 2014 09:14
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AES encryption example using M2Crypto module
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| import sys | |
| import base64 | |
| from M2Crypto import Rand, EVP | |
| ENC_METHOD="aes_256_cbc" | |
| MODE_B64, MODE_BIN = 0, 1 | |
| IV_LEN = 16 | |
| def encrypt(s, key, mode=MODE_BIN): | |
| iv = Rand.rand_bytes(IV_LEN) # can be : iv = os.urandom(IV_LEN) | |
| cipher = EVP.Cipher(ENC_METHOD, key=key, iv=iv, op=1) | |
| v = cipher.update(s) | |
| v = iv + v + cipher.final() | |
| if mode == MODE_B64: | |
| v = base64.urlsafe_b64encode(v) | |
| return v | |
| def decrypt(s, key, mode=MODE_BIN): | |
| if mode == MODE_B64: | |
| s = base64.urlsafe_b64decode(s) | |
| iv = s[:IV_LEN] | |
| cipher = EVP.Cipher(ENC_METHOD, key=key, iv=iv, op=0) | |
| v = cipher.update(s[IV_LEN:]) | |
| v = v + cipher.final() | |
| return v | |
| if __name__ == "__main__": | |
| passwd = 'mypassword' | |
| s = encrypt('test data for m2crypto encryption & decryption', passwd, mode=MODE_B64) | |
| print len(s), repr(s) | |
| s = decrypt(s, passwd, mode=MODE_B64) | |
| print len(s), repr(s) |
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