diff options
Diffstat (limited to 'src/add_python/lilliput/ae_mode_2.py')
| -rw-r--r-- | src/add_python/lilliput/ae_mode_2.py | 62 |
1 files changed, 31 insertions, 31 deletions
diff --git a/src/add_python/lilliput/ae_mode_2.py b/src/add_python/lilliput/ae_mode_2.py index fb6feff..4d5e499 100644 --- a/src/add_python/lilliput/ae_mode_2.py +++ b/src/add_python/lilliput/ae_mode_2.py @@ -20,12 +20,12 @@ using Lilliput-AE's nonce-misuse-resistant mode based on SCT-2. from .constants import BLOCK_BYTES from .helpers import ( - ArrayToBlockbytesMatrix, - BlockbytesMatrixToBytes, - BuildAuth, - Padding10LSB, + bytes_to_block_matrix, + block_matrix_to_bytes, + build_auth, + pad10, TagValidationError, - XorState + xor_state ) from . import tbc @@ -34,7 +34,7 @@ TWEAK_BITS = 128 TWEAK_BYTES = TWEAK_BITS//8 -def _TweakTag(j, padded): +def _tweak_tag(j, padded): tweak = [0 for byte in range(0, TWEAK_BYTES)] tweak[TWEAK_BYTES - 1] |= ((j >> 120) & 0xf) @@ -47,7 +47,7 @@ def _TweakTag(j, padded): return tweak -def _TweakTagEnd(N): +def _tweak_tag_end(N): tweak = [0 for byte in range(0, TWEAK_BYTES)] for byte in range(0, TWEAK_BYTES - 1): @@ -57,61 +57,61 @@ def _TweakTagEnd(N): return tweak -def _AddTagJ(tag, j): +def _add_tag_j(tag, j): array_j = [0 for byte in range(0, TWEAK_BYTES)] for byte in range(0, TWEAK_BYTES): array_j[byte] = (j >> (byte * 8)) - xorr = XorState(tag, array_j) + xorr = xor_state(tag, array_j) xorr[TWEAK_BYTES - 1] |= 0x80 return xorr -def _MesssageAuthTag(M, N, Auth, key): +def _message_auth_tag(M, N, Auth, key): l = len(M)//BLOCK_BYTES need_padding = len(M)%BLOCK_BYTES > 0 tag = list(Auth) - M = ArrayToBlockbytesMatrix(M) + M = bytes_to_block_matrix(M) for j in range(0, l): - tweak = _TweakTag(j, False) + tweak = _tweak_tag(j, False) encryption = tbc.encrypt(tweak, key, M[j]) - tag = XorState(tag, encryption) + tag = xor_state(tag, encryption) if need_padding: - tweak = _TweakTag(l, True) - m_padded = Padding10LSB(M[l]) + tweak = _tweak_tag(l, True) + m_padded = pad10(M[l]) encryption = tbc.encrypt(tweak, key, m_padded) - tag = XorState(tag, encryption) + tag = xor_state(tag, encryption) - tweak = _TweakTagEnd(N) + tweak = _tweak_tag_end(N) encryption = tbc.encrypt(tweak, key, tag) tag = encryption return tag -def _MessageEncryption(M, N, tag, key): +def _message_encryption(M, N, tag, key): l = len(M)//BLOCK_BYTES need_padding = len(M)%BLOCK_BYTES > 0 - M = ArrayToBlockbytesMatrix(M) + M = bytes_to_block_matrix(M) C = [] for j in range(0, l): - tweak = _AddTagJ(tag, j) + tweak = _add_tag_j(tag, j) padded_nonce = list(N) + [0x00] encryption = tbc.encrypt(tweak, key, padded_nonce) - C.append(XorState(M[j], encryption)) + C.append(xor_state(M[j], encryption)) if need_padding: - tweak = _AddTagJ(tag, l) + tweak = _add_tag_j(tag, l) padded_nonce = list(N) + [0x00] encryption = tbc.encrypt(tweak, key, padded_nonce) - C.append(XorState(M[l], encryption)) + C.append(xor_state(M[l], encryption)) return C @@ -120,22 +120,22 @@ def _MessageEncryption(M, N, tag, key): def encrypt(A, M, N, key): K = list(key) - Auth = BuildAuth(TWEAK_BITS, A, K) - tag = _MesssageAuthTag(M, N, Auth, K) - C = _MessageEncryption(M, N, tag, K) + Auth = build_auth(TWEAK_BITS, A, K) + tag = _message_auth_tag(M, N, Auth, K) + C = _message_encryption(M, N, tag, K) - return BlockbytesMatrixToBytes(C), bytes(tag) + return block_matrix_to_bytes(C), bytes(tag) def decrypt(A, C, N, tag, key): K = list(key) tag = list(tag) - M = BlockbytesMatrixToBytes( - _MessageEncryption(C, N, tag, K) + M = block_matrix_to_bytes( + _message_encryption(C, N, tag, K) ) - Auth = BuildAuth(TWEAK_BITS, A, K) - tag2 = _MesssageAuthTag(M, N, Auth, K) + Auth = build_auth(TWEAK_BITS, A, K) + tag2 = _message_auth_tag(M, N, Auth, K) if tag != tag2: raise TagValidationError(tag, tag2) |