Why Do Go and Pycrypto Produce Different AES-CFB Ciphertexts?

Different Results Between Go and Pycrypto with AES-CFB

When attempting to implement AES-CFB encryption using Python's Pycrypto and Go's crypto package, significant discrepancies in ciphertext results were observed. This discrepancy arises due to different settings used in the encryption process:

Python Pycrypto:

• AES-CFB mode with 16-bit segments (CFB16)

Go crypto package:

• AES-CFB mode with 8-bit segments (CFB8)

Resolution
Go does not natively support CFB8 out-of-the-box. However, by modifying the source code of the built-in CFBDecrypter and CFBEncrypter in the crypto package, Go can be adapted to support CFB8. This modification involves replacing certain hard-coded constants to accommodate the 8-bit segment size.

By implementing this modification, Go becomes fully compatible with the encryption settings used in the Python Pycrypto implementation. Consequently, it can successfully decrypt ciphertext generated by Pycrypto and vice versa.

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