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56 lines
1.6 KiB
Python
56 lines
1.6 KiB
Python
import pytest
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from keycard.crypto import aes
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def test_aes_cbc_encrypt_decrypt_roundtrip():
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key = b'0123456789abcdef'
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iv = b'abcdef9876543210'
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data = b'hello world 1234'
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ciphertext = aes.aes_cbc_encrypt(key, iv, data)
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decrypted = aes.aes_cbc_decrypt(key, iv, ciphertext)
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assert decrypted == data
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def test_aes_cbc_encrypt_padding():
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key = b'0123456789abcdef'
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iv = b'abcdef9876543210'
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data = b'abc'
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ciphertext = aes.aes_cbc_encrypt(key, iv, data)
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assert len(ciphertext) % 16 == 0
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decrypted = aes.aes_cbc_decrypt(key, iv, ciphertext)
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assert decrypted == data
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def test_aes_cbc_encrypt_no_padding():
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key = b'0123456789abcdef'
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iv = b'abcdef9876543210'
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data = b'1234567890abcdef'
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ciphertext = aes.aes_cbc_encrypt(key, iv, data, padding=False)
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assert len(ciphertext) == 16
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with pytest.raises(ValueError):
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aes.aes_cbc_decrypt(key, iv, ciphertext)
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def test_aes_cbc_decrypt_invalid_padding():
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key = b'0123456789abcdef'
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iv = b'abcdef9876543210'
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data = b'1234567890abcdef'
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ciphertext = aes.aes_cbc_encrypt(key, iv, data, padding=False)
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with pytest.raises(ValueError):
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aes.aes_cbc_decrypt(key, iv, ciphertext)
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@pytest.mark.parametrize('data', [
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b'',
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b'a',
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b'short',
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b'exactly16bytes!!',
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b'longer data that is not a multiple of block size',
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])
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def test_various_lengths(data):
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key = b'0123456789abcdef'
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iv = b'abcdef9876543210'
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ciphertext = aes.aes_cbc_encrypt(key, iv, data)
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decrypted = aes.aes_cbc_decrypt(key, iv, ciphertext)
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assert decrypted == data
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