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Commit | Line | Data |
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dcddc10a PH |
1 | from __future__ import unicode_literals |
2 | ||
f3bcebb1 | 3 | from math import ceil |
4 | ||
edf65256 | 5 | from .compat import compat_b64decode, compat_pycrypto_AES |
0012690a | 6 | from .utils import bytes_to_intlist, intlist_to_bytes |
48ea9cea | 7 | |
edf65256 | 8 | |
9 | if compat_pycrypto_AES: | |
10 | def aes_cbc_decrypt_bytes(data, key, iv): | |
11 | """ Decrypt bytes with AES-CBC using pycryptodome """ | |
12 | return compat_pycrypto_AES.new(key, compat_pycrypto_AES.MODE_CBC, iv).decrypt(data) | |
13 | ||
09906f55 ÁS |
14 | def aes_gcm_decrypt_and_verify_bytes(data, key, tag, nonce): |
15 | """ Decrypt bytes with AES-GCM using pycryptodome """ | |
16 | return compat_pycrypto_AES.new(key, compat_pycrypto_AES.MODE_GCM, nonce).decrypt_and_verify(data, tag) | |
17 | ||
edf65256 | 18 | else: |
19 | def aes_cbc_decrypt_bytes(data, key, iv): | |
20 | """ Decrypt bytes with AES-CBC using native implementation since pycryptodome is unavailable """ | |
21 | return intlist_to_bytes(aes_cbc_decrypt(*map(bytes_to_intlist, (data, key, iv)))) | |
22 | ||
09906f55 ÁS |
23 | def aes_gcm_decrypt_and_verify_bytes(data, key, tag, nonce): |
24 | """ Decrypt bytes with AES-GCM using native implementation since pycryptodome is unavailable """ | |
25 | return intlist_to_bytes(aes_gcm_decrypt_and_verify(*map(bytes_to_intlist, (data, key, tag, nonce)))) | |
26 | ||
edf65256 | 27 | |
f3bcebb1 | 28 | BLOCK_SIZE_BYTES = 16 |
29 | ||
5f6a1245 | 30 | |
a04e0055 THD |
31 | def aes_ecb_encrypt(data, key, iv=None): |
32 | """ | |
33 | Encrypt with aes in ECB mode | |
34 | ||
35 | @param {int[]} data cleartext | |
36 | @param {int[]} key 16/24/32-Byte cipher key | |
37 | @param {int[]} iv Unused for this mode | |
38 | @returns {int[]} encrypted data | |
39 | """ | |
40 | expanded_key = key_expansion(key) | |
41 | block_count = int(ceil(float(len(data)) / BLOCK_SIZE_BYTES)) | |
42 | ||
43 | encrypted_data = [] | |
44 | for i in range(block_count): | |
45 | block = data[i * BLOCK_SIZE_BYTES: (i + 1) * BLOCK_SIZE_BYTES] | |
46 | encrypted_data += aes_encrypt(block, expanded_key) | |
47 | encrypted_data = encrypted_data[:len(data)] | |
48 | ||
49 | return encrypted_data | |
50 | ||
51 | ||
52 | def aes_ecb_decrypt(data, key, iv=None): | |
53 | """ | |
54 | Decrypt with aes in ECB mode | |
55 | ||
56 | @param {int[]} data cleartext | |
57 | @param {int[]} key 16/24/32-Byte cipher key | |
58 | @param {int[]} iv Unused for this mode | |
59 | @returns {int[]} decrypted data | |
60 | """ | |
61 | expanded_key = key_expansion(key) | |
62 | block_count = int(ceil(float(len(data)) / BLOCK_SIZE_BYTES)) | |
63 | ||
64 | encrypted_data = [] | |
65 | for i in range(block_count): | |
66 | block = data[i * BLOCK_SIZE_BYTES: (i + 1) * BLOCK_SIZE_BYTES] | |
67 | encrypted_data += aes_decrypt(block, expanded_key) | |
68 | encrypted_data = encrypted_data[:len(data)] | |
69 | ||
70 | return encrypted_data | |
71 | ||
72 | ||
09906f55 | 73 | def aes_ctr_decrypt(data, key, iv): |
f3bcebb1 | 74 | """ |
75 | Decrypt with aes in counter mode | |
5f6a1245 | 76 | |
f3bcebb1 | 77 | @param {int[]} data cipher |
78 | @param {int[]} key 16/24/32-Byte cipher key | |
09906f55 | 79 | @param {int[]} iv 16-Byte initialization vector |
f3bcebb1 | 80 | @returns {int[]} decrypted data |
81 | """ | |
09906f55 ÁS |
82 | return aes_ctr_encrypt(data, key, iv) |
83 | ||
84 | ||
85 | def aes_ctr_encrypt(data, key, iv): | |
86 | """ | |
87 | Encrypt with aes in counter mode | |
88 | ||
89 | @param {int[]} data cleartext | |
90 | @param {int[]} key 16/24/32-Byte cipher key | |
91 | @param {int[]} iv 16-Byte initialization vector | |
92 | @returns {int[]} encrypted data | |
93 | """ | |
f3bcebb1 | 94 | expanded_key = key_expansion(key) |
6e74bc41 | 95 | block_count = int(ceil(float(len(data)) / BLOCK_SIZE_BYTES)) |
09906f55 | 96 | counter = iter_vector(iv) |
5f6a1245 | 97 | |
09906f55 | 98 | encrypted_data = [] |
f3bcebb1 | 99 | for i in range(block_count): |
09906f55 | 100 | counter_block = next(counter) |
2514d263 JW |
101 | block = data[i * BLOCK_SIZE_BYTES: (i + 1) * BLOCK_SIZE_BYTES] |
102 | block += [0] * (BLOCK_SIZE_BYTES - len(block)) | |
5f6a1245 | 103 | |
f3bcebb1 | 104 | cipher_counter_block = aes_encrypt(counter_block, expanded_key) |
09906f55 ÁS |
105 | encrypted_data += xor(block, cipher_counter_block) |
106 | encrypted_data = encrypted_data[:len(data)] | |
5f6a1245 | 107 | |
09906f55 | 108 | return encrypted_data |
f3bcebb1 | 109 | |
5f6a1245 | 110 | |
c8434e83 | 111 | def aes_cbc_decrypt(data, key, iv): |
112 | """ | |
113 | Decrypt with aes in CBC mode | |
5f6a1245 | 114 | |
c8434e83 | 115 | @param {int[]} data cipher |
116 | @param {int[]} key 16/24/32-Byte cipher key | |
117 | @param {int[]} iv 16-Byte IV | |
118 | @returns {int[]} decrypted data | |
119 | """ | |
120 | expanded_key = key_expansion(key) | |
121 | block_count = int(ceil(float(len(data)) / BLOCK_SIZE_BYTES)) | |
5f6a1245 JW |
122 | |
123 | decrypted_data = [] | |
c8434e83 | 124 | previous_cipher_block = iv |
125 | for i in range(block_count): | |
2514d263 JW |
126 | block = data[i * BLOCK_SIZE_BYTES: (i + 1) * BLOCK_SIZE_BYTES] |
127 | block += [0] * (BLOCK_SIZE_BYTES - len(block)) | |
5f6a1245 | 128 | |
c8434e83 | 129 | decrypted_block = aes_decrypt(block, expanded_key) |
130 | decrypted_data += xor(decrypted_block, previous_cipher_block) | |
131 | previous_cipher_block = block | |
132 | decrypted_data = decrypted_data[:len(data)] | |
5f6a1245 | 133 | |
c8434e83 | 134 | return decrypted_data |
135 | ||
5f6a1245 | 136 | |
c9619f0a YCH |
137 | def aes_cbc_encrypt(data, key, iv): |
138 | """ | |
139 | Encrypt with aes in CBC mode. Using PKCS#7 padding | |
140 | ||
141 | @param {int[]} data cleartext | |
142 | @param {int[]} key 16/24/32-Byte cipher key | |
143 | @param {int[]} iv 16-Byte IV | |
144 | @returns {int[]} encrypted data | |
145 | """ | |
146 | expanded_key = key_expansion(key) | |
147 | block_count = int(ceil(float(len(data)) / BLOCK_SIZE_BYTES)) | |
148 | ||
149 | encrypted_data = [] | |
150 | previous_cipher_block = iv | |
151 | for i in range(block_count): | |
152 | block = data[i * BLOCK_SIZE_BYTES: (i + 1) * BLOCK_SIZE_BYTES] | |
153 | remaining_length = BLOCK_SIZE_BYTES - len(block) | |
154 | block += [remaining_length] * remaining_length | |
155 | mixed_block = xor(block, previous_cipher_block) | |
156 | ||
157 | encrypted_block = aes_encrypt(mixed_block, expanded_key) | |
158 | encrypted_data += encrypted_block | |
159 | ||
160 | previous_cipher_block = encrypted_block | |
161 | ||
162 | return encrypted_data | |
163 | ||
164 | ||
09906f55 | 165 | def aes_gcm_decrypt_and_verify(data, key, tag, nonce): |
f3bcebb1 | 166 | """ |
09906f55 | 167 | Decrypt with aes in GBM mode and checks authenticity using tag |
5f6a1245 | 168 | |
09906f55 ÁS |
169 | @param {int[]} data cipher |
170 | @param {int[]} key 16-Byte cipher key | |
171 | @param {int[]} tag authentication tag | |
172 | @param {int[]} nonce IV (recommended 12-Byte) | |
173 | @returns {int[]} decrypted data | |
f3bcebb1 | 174 | """ |
5f6a1245 | 175 | |
09906f55 | 176 | # XXX: check aes, gcm param |
5f6a1245 | 177 | |
09906f55 | 178 | hash_subkey = aes_encrypt([0] * BLOCK_SIZE_BYTES, key_expansion(key)) |
5f6a1245 | 179 | |
09906f55 ÁS |
180 | if len(nonce) == 12: |
181 | j0 = nonce + [0, 0, 0, 1] | |
182 | else: | |
183 | fill = (BLOCK_SIZE_BYTES - (len(nonce) % BLOCK_SIZE_BYTES)) % BLOCK_SIZE_BYTES + 8 | |
184 | ghash_in = nonce + [0] * fill + bytes_to_intlist((8 * len(nonce)).to_bytes(8, 'big')) | |
185 | j0 = ghash(hash_subkey, ghash_in) | |
5f6a1245 | 186 | |
09906f55 | 187 | # TODO: add nonce support to aes_ctr_decrypt |
5f6a1245 | 188 | |
09906f55 ÁS |
189 | # nonce_ctr = j0[:12] |
190 | iv_ctr = inc(j0) | |
191 | ||
192 | decrypted_data = aes_ctr_decrypt(data, key, iv_ctr + [0] * (BLOCK_SIZE_BYTES - len(iv_ctr))) | |
193 | pad_len = len(data) // 16 * 16 | |
194 | s_tag = ghash( | |
195 | hash_subkey, | |
196 | data | |
197 | + [0] * (BLOCK_SIZE_BYTES - len(data) + pad_len) # pad | |
198 | + bytes_to_intlist((0 * 8).to_bytes(8, 'big') # length of associated data | |
199 | + ((len(data) * 8).to_bytes(8, 'big'))) # length of data | |
200 | ) | |
201 | ||
202 | if tag != aes_ctr_encrypt(s_tag, key, j0): | |
203 | raise ValueError("Mismatching authentication tag") | |
204 | ||
205 | return decrypted_data | |
f3bcebb1 | 206 | |
5f6a1245 | 207 | |
f3bcebb1 | 208 | def aes_encrypt(data, expanded_key): |
209 | """ | |
210 | Encrypt one block with aes | |
5f6a1245 | 211 | |
f3bcebb1 | 212 | @param {int[]} data 16-Byte state |
5f6a1245 | 213 | @param {int[]} expanded_key 176/208/240-Byte expanded key |
f3bcebb1 | 214 | @returns {int[]} 16-Byte cipher |
215 | """ | |
48ea9cea | 216 | rounds = len(expanded_key) // BLOCK_SIZE_BYTES - 1 |
c8434e83 | 217 | |
f3bcebb1 | 218 | data = xor(data, expanded_key[:BLOCK_SIZE_BYTES]) |
2514d263 | 219 | for i in range(1, rounds + 1): |
f3bcebb1 | 220 | data = sub_bytes(data) |
221 | data = shift_rows(data) | |
222 | if i != rounds: | |
ff1dec81 | 223 | data = list(iter_mix_columns(data, MIX_COLUMN_MATRIX)) |
2514d263 | 224 | data = xor(data, expanded_key[i * BLOCK_SIZE_BYTES: (i + 1) * BLOCK_SIZE_BYTES]) |
c8434e83 | 225 | |
226 | return data | |
227 | ||
5f6a1245 | 228 | |
c8434e83 | 229 | def aes_decrypt(data, expanded_key): |
230 | """ | |
231 | Decrypt one block with aes | |
5f6a1245 | 232 | |
c8434e83 | 233 | @param {int[]} data 16-Byte cipher |
234 | @param {int[]} expanded_key 176/208/240-Byte expanded key | |
235 | @returns {int[]} 16-Byte state | |
236 | """ | |
237 | rounds = len(expanded_key) // BLOCK_SIZE_BYTES - 1 | |
5f6a1245 | 238 | |
c8434e83 | 239 | for i in range(rounds, 0, -1): |
2514d263 | 240 | data = xor(data, expanded_key[i * BLOCK_SIZE_BYTES: (i + 1) * BLOCK_SIZE_BYTES]) |
c8434e83 | 241 | if i != rounds: |
ff1dec81 | 242 | data = list(iter_mix_columns(data, MIX_COLUMN_MATRIX_INV)) |
c8434e83 | 243 | data = shift_rows_inv(data) |
244 | data = sub_bytes_inv(data) | |
245 | data = xor(data, expanded_key[:BLOCK_SIZE_BYTES]) | |
5f6a1245 | 246 | |
f3bcebb1 | 247 | return data |
248 | ||
5f6a1245 | 249 | |
f3bcebb1 | 250 | def aes_decrypt_text(data, password, key_size_bytes): |
251 | """ | |
252 | Decrypt text | |
253 | - The first 8 Bytes of decoded 'data' are the 8 high Bytes of the counter | |
254 | - The cipher key is retrieved by encrypting the first 16 Byte of 'password' | |
255 | with the first 'key_size_bytes' Bytes from 'password' (if necessary filled with 0's) | |
256 | - Mode of operation is 'counter' | |
5f6a1245 | 257 | |
f3bcebb1 | 258 | @param {str} data Base64 encoded string |
259 | @param {str,unicode} password Password (will be encoded with utf-8) | |
260 | @param {int} key_size_bytes Possible values: 16 for 128-Bit, 24 for 192-Bit or 32 for 256-Bit | |
261 | @returns {str} Decrypted data | |
262 | """ | |
263 | NONCE_LENGTH_BYTES = 8 | |
5f6a1245 | 264 | |
cf282071 | 265 | data = bytes_to_intlist(compat_b64decode(data)) |
48ea9cea | 266 | password = bytes_to_intlist(password.encode('utf-8')) |
5f6a1245 | 267 | |
2514d263 | 268 | key = password[:key_size_bytes] + [0] * (key_size_bytes - len(password)) |
48ea9cea | 269 | key = aes_encrypt(key[:BLOCK_SIZE_BYTES], key_expansion(key)) * (key_size_bytes // BLOCK_SIZE_BYTES) |
5f6a1245 | 270 | |
f3bcebb1 | 271 | nonce = data[:NONCE_LENGTH_BYTES] |
272 | cipher = data[NONCE_LENGTH_BYTES:] | |
5f6a1245 | 273 | |
09906f55 | 274 | decrypted_data = aes_ctr_decrypt(cipher, key, nonce + [0] * (BLOCK_SIZE_BYTES - NONCE_LENGTH_BYTES)) |
0012690a | 275 | plaintext = intlist_to_bytes(decrypted_data) |
5f6a1245 | 276 | |
f3bcebb1 | 277 | return plaintext |
278 | ||
582be358 | 279 | |
f3bcebb1 | 280 | RCON = (0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36) |
281 | SBOX = (0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76, | |
282 | 0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0, | |
283 | 0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15, | |
284 | 0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75, | |
285 | 0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0, 0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84, | |
286 | 0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B, 0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF, | |
287 | 0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, 0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8, | |
288 | 0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5, 0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2, | |
289 | 0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73, | |
290 | 0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB, | |
291 | 0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C, 0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79, | |
292 | 0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08, | |
293 | 0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A, | |
294 | 0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E, 0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E, | |
295 | 0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94, 0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF, | |
296 | 0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, 0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16) | |
c8434e83 | 297 | SBOX_INV = (0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb, |
298 | 0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb, | |
299 | 0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e, | |
300 | 0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25, | |
301 | 0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92, | |
302 | 0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84, | |
303 | 0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06, | |
304 | 0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b, | |
305 | 0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73, | |
306 | 0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e, | |
307 | 0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b, | |
308 | 0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4, | |
309 | 0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f, | |
310 | 0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef, | |
311 | 0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61, | |
312 | 0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d) | |
5f6a1245 JW |
313 | MIX_COLUMN_MATRIX = ((0x2, 0x3, 0x1, 0x1), |
314 | (0x1, 0x2, 0x3, 0x1), | |
315 | (0x1, 0x1, 0x2, 0x3), | |
316 | (0x3, 0x1, 0x1, 0x2)) | |
317 | MIX_COLUMN_MATRIX_INV = ((0xE, 0xB, 0xD, 0x9), | |
318 | (0x9, 0xE, 0xB, 0xD), | |
319 | (0xD, 0x9, 0xE, 0xB), | |
320 | (0xB, 0xD, 0x9, 0xE)) | |
c8434e83 | 321 | RIJNDAEL_EXP_TABLE = (0x01, 0x03, 0x05, 0x0F, 0x11, 0x33, 0x55, 0xFF, 0x1A, 0x2E, 0x72, 0x96, 0xA1, 0xF8, 0x13, 0x35, |
322 | 0x5F, 0xE1, 0x38, 0x48, 0xD8, 0x73, 0x95, 0xA4, 0xF7, 0x02, 0x06, 0x0A, 0x1E, 0x22, 0x66, 0xAA, | |
323 | 0xE5, 0x34, 0x5C, 0xE4, 0x37, 0x59, 0xEB, 0x26, 0x6A, 0xBE, 0xD9, 0x70, 0x90, 0xAB, 0xE6, 0x31, | |
324 | 0x53, 0xF5, 0x04, 0x0C, 0x14, 0x3C, 0x44, 0xCC, 0x4F, 0xD1, 0x68, 0xB8, 0xD3, 0x6E, 0xB2, 0xCD, | |
325 | 0x4C, 0xD4, 0x67, 0xA9, 0xE0, 0x3B, 0x4D, 0xD7, 0x62, 0xA6, 0xF1, 0x08, 0x18, 0x28, 0x78, 0x88, | |
326 | 0x83, 0x9E, 0xB9, 0xD0, 0x6B, 0xBD, 0xDC, 0x7F, 0x81, 0x98, 0xB3, 0xCE, 0x49, 0xDB, 0x76, 0x9A, | |
327 | 0xB5, 0xC4, 0x57, 0xF9, 0x10, 0x30, 0x50, 0xF0, 0x0B, 0x1D, 0x27, 0x69, 0xBB, 0xD6, 0x61, 0xA3, | |
328 | 0xFE, 0x19, 0x2B, 0x7D, 0x87, 0x92, 0xAD, 0xEC, 0x2F, 0x71, 0x93, 0xAE, 0xE9, 0x20, 0x60, 0xA0, | |
329 | 0xFB, 0x16, 0x3A, 0x4E, 0xD2, 0x6D, 0xB7, 0xC2, 0x5D, 0xE7, 0x32, 0x56, 0xFA, 0x15, 0x3F, 0x41, | |
330 | 0xC3, 0x5E, 0xE2, 0x3D, 0x47, 0xC9, 0x40, 0xC0, 0x5B, 0xED, 0x2C, 0x74, 0x9C, 0xBF, 0xDA, 0x75, | |
331 | 0x9F, 0xBA, 0xD5, 0x64, 0xAC, 0xEF, 0x2A, 0x7E, 0x82, 0x9D, 0xBC, 0xDF, 0x7A, 0x8E, 0x89, 0x80, | |
332 | 0x9B, 0xB6, 0xC1, 0x58, 0xE8, 0x23, 0x65, 0xAF, 0xEA, 0x25, 0x6F, 0xB1, 0xC8, 0x43, 0xC5, 0x54, | |
333 | 0xFC, 0x1F, 0x21, 0x63, 0xA5, 0xF4, 0x07, 0x09, 0x1B, 0x2D, 0x77, 0x99, 0xB0, 0xCB, 0x46, 0xCA, | |
334 | 0x45, 0xCF, 0x4A, 0xDE, 0x79, 0x8B, 0x86, 0x91, 0xA8, 0xE3, 0x3E, 0x42, 0xC6, 0x51, 0xF3, 0x0E, | |
335 | 0x12, 0x36, 0x5A, 0xEE, 0x29, 0x7B, 0x8D, 0x8C, 0x8F, 0x8A, 0x85, 0x94, 0xA7, 0xF2, 0x0D, 0x17, | |
336 | 0x39, 0x4B, 0xDD, 0x7C, 0x84, 0x97, 0xA2, 0xFD, 0x1C, 0x24, 0x6C, 0xB4, 0xC7, 0x52, 0xF6, 0x01) | |
337 | RIJNDAEL_LOG_TABLE = (0x00, 0x00, 0x19, 0x01, 0x32, 0x02, 0x1a, 0xc6, 0x4b, 0xc7, 0x1b, 0x68, 0x33, 0xee, 0xdf, 0x03, | |
338 | 0x64, 0x04, 0xe0, 0x0e, 0x34, 0x8d, 0x81, 0xef, 0x4c, 0x71, 0x08, 0xc8, 0xf8, 0x69, 0x1c, 0xc1, | |
339 | 0x7d, 0xc2, 0x1d, 0xb5, 0xf9, 0xb9, 0x27, 0x6a, 0x4d, 0xe4, 0xa6, 0x72, 0x9a, 0xc9, 0x09, 0x78, | |
340 | 0x65, 0x2f, 0x8a, 0x05, 0x21, 0x0f, 0xe1, 0x24, 0x12, 0xf0, 0x82, 0x45, 0x35, 0x93, 0xda, 0x8e, | |
341 | 0x96, 0x8f, 0xdb, 0xbd, 0x36, 0xd0, 0xce, 0x94, 0x13, 0x5c, 0xd2, 0xf1, 0x40, 0x46, 0x83, 0x38, | |
342 | 0x66, 0xdd, 0xfd, 0x30, 0xbf, 0x06, 0x8b, 0x62, 0xb3, 0x25, 0xe2, 0x98, 0x22, 0x88, 0x91, 0x10, | |
343 | 0x7e, 0x6e, 0x48, 0xc3, 0xa3, 0xb6, 0x1e, 0x42, 0x3a, 0x6b, 0x28, 0x54, 0xfa, 0x85, 0x3d, 0xba, | |
344 | 0x2b, 0x79, 0x0a, 0x15, 0x9b, 0x9f, 0x5e, 0xca, 0x4e, 0xd4, 0xac, 0xe5, 0xf3, 0x73, 0xa7, 0x57, | |
345 | 0xaf, 0x58, 0xa8, 0x50, 0xf4, 0xea, 0xd6, 0x74, 0x4f, 0xae, 0xe9, 0xd5, 0xe7, 0xe6, 0xad, 0xe8, | |
346 | 0x2c, 0xd7, 0x75, 0x7a, 0xeb, 0x16, 0x0b, 0xf5, 0x59, 0xcb, 0x5f, 0xb0, 0x9c, 0xa9, 0x51, 0xa0, | |
347 | 0x7f, 0x0c, 0xf6, 0x6f, 0x17, 0xc4, 0x49, 0xec, 0xd8, 0x43, 0x1f, 0x2d, 0xa4, 0x76, 0x7b, 0xb7, | |
348 | 0xcc, 0xbb, 0x3e, 0x5a, 0xfb, 0x60, 0xb1, 0x86, 0x3b, 0x52, 0xa1, 0x6c, 0xaa, 0x55, 0x29, 0x9d, | |
349 | 0x97, 0xb2, 0x87, 0x90, 0x61, 0xbe, 0xdc, 0xfc, 0xbc, 0x95, 0xcf, 0xcd, 0x37, 0x3f, 0x5b, 0xd1, | |
350 | 0x53, 0x39, 0x84, 0x3c, 0x41, 0xa2, 0x6d, 0x47, 0x14, 0x2a, 0x9e, 0x5d, 0x56, 0xf2, 0xd3, 0xab, | |
351 | 0x44, 0x11, 0x92, 0xd9, 0x23, 0x20, 0x2e, 0x89, 0xb4, 0x7c, 0xb8, 0x26, 0x77, 0x99, 0xe3, 0xa5, | |
352 | 0x67, 0x4a, 0xed, 0xde, 0xc5, 0x31, 0xfe, 0x18, 0x0d, 0x63, 0x8c, 0x80, 0xc0, 0xf7, 0x70, 0x07) | |
f3bcebb1 | 353 | |
5f6a1245 | 354 | |
09906f55 ÁS |
355 | def key_expansion(data): |
356 | """ | |
357 | Generate key schedule | |
358 | ||
359 | @param {int[]} data 16/24/32-Byte cipher key | |
360 | @returns {int[]} 176/208/240-Byte expanded key | |
361 | """ | |
362 | data = data[:] # copy | |
363 | rcon_iteration = 1 | |
364 | key_size_bytes = len(data) | |
365 | expanded_key_size_bytes = (key_size_bytes // 4 + 7) * BLOCK_SIZE_BYTES | |
366 | ||
367 | while len(data) < expanded_key_size_bytes: | |
368 | temp = data[-4:] | |
369 | temp = key_schedule_core(temp, rcon_iteration) | |
370 | rcon_iteration += 1 | |
371 | data += xor(temp, data[-key_size_bytes: 4 - key_size_bytes]) | |
372 | ||
373 | for _ in range(3): | |
374 | temp = data[-4:] | |
375 | data += xor(temp, data[-key_size_bytes: 4 - key_size_bytes]) | |
376 | ||
377 | if key_size_bytes == 32: | |
378 | temp = data[-4:] | |
379 | temp = sub_bytes(temp) | |
380 | data += xor(temp, data[-key_size_bytes: 4 - key_size_bytes]) | |
381 | ||
382 | for _ in range(3 if key_size_bytes == 32 else 2 if key_size_bytes == 24 else 0): | |
383 | temp = data[-4:] | |
384 | data += xor(temp, data[-key_size_bytes: 4 - key_size_bytes]) | |
385 | data = data[:expanded_key_size_bytes] | |
386 | ||
387 | return data | |
388 | ||
389 | ||
390 | def iter_vector(iv): | |
391 | while True: | |
392 | yield iv | |
393 | iv = inc(iv) | |
394 | ||
395 | ||
f3bcebb1 | 396 | def sub_bytes(data): |
48ea9cea | 397 | return [SBOX[x] for x in data] |
f3bcebb1 | 398 | |
5f6a1245 | 399 | |
c8434e83 | 400 | def sub_bytes_inv(data): |
401 | return [SBOX_INV[x] for x in data] | |
402 | ||
5f6a1245 | 403 | |
f3bcebb1 | 404 | def rotate(data): |
405 | return data[1:] + [data[0]] | |
406 | ||
5f6a1245 | 407 | |
f3bcebb1 | 408 | def key_schedule_core(data, rcon_iteration): |
409 | data = rotate(data) | |
410 | data = sub_bytes(data) | |
411 | data[0] = data[0] ^ RCON[rcon_iteration] | |
5f6a1245 | 412 | |
f3bcebb1 | 413 | return data |
414 | ||
5f6a1245 | 415 | |
f3bcebb1 | 416 | def xor(data1, data2): |
2514d263 | 417 | return [x ^ y for x, y in zip(data1, data2)] |
f3bcebb1 | 418 | |
5f6a1245 | 419 | |
ff1dec81 ÁS |
420 | def iter_mix_columns(data, matrix): |
421 | for i in (0, 4, 8, 12): | |
422 | for row in matrix: | |
423 | mixed = 0 | |
424 | for j in range(4): | |
425 | # xor is (+) and (-) | |
426 | mixed ^= (0 if data[i:i + 4][j] == 0 or row[j] == 0 else | |
427 | RIJNDAEL_EXP_TABLE[(RIJNDAEL_LOG_TABLE[data[i + j]] + RIJNDAEL_LOG_TABLE[row[j]]) % 0xFF]) | |
428 | yield mixed | |
c8434e83 | 429 | |
5f6a1245 | 430 | |
f3bcebb1 | 431 | def shift_rows(data): |
ff1dec81 | 432 | return [data[((column + row) & 0b11) * 4 + row] for column in range(4) for row in range(4)] |
f3bcebb1 | 433 | |
5f6a1245 | 434 | |
c8434e83 | 435 | def shift_rows_inv(data): |
ff1dec81 | 436 | return [data[((column - row) & 0b11) * 4 + row] for column in range(4) for row in range(4)] |
c8434e83 | 437 | |
5f6a1245 | 438 | |
09906f55 ÁS |
439 | def shift_block(data): |
440 | data_shifted = [] | |
441 | ||
442 | bit = 0 | |
443 | for n in data: | |
444 | if bit: | |
445 | n |= 0x100 | |
446 | bit = n & 1 | |
447 | n >>= 1 | |
448 | data_shifted.append(n) | |
449 | ||
450 | return data_shifted | |
451 | ||
452 | ||
f3bcebb1 | 453 | def inc(data): |
5f6a1245 | 454 | data = data[:] # copy |
2514d263 | 455 | for i in range(len(data) - 1, -1, -1): |
f3bcebb1 | 456 | if data[i] == 255: |
457 | data[i] = 0 | |
458 | else: | |
459 | data[i] = data[i] + 1 | |
460 | break | |
461 | return data | |
f36f92f4 | 462 | |
582be358 | 463 | |
09906f55 ÁS |
464 | def block_product(block_x, block_y): |
465 | # NIST SP 800-38D, Algorithm 1 | |
466 | ||
467 | if len(block_x) != BLOCK_SIZE_BYTES or len(block_y) != BLOCK_SIZE_BYTES: | |
468 | raise ValueError("Length of blocks need to be %d bytes" % BLOCK_SIZE_BYTES) | |
469 | ||
470 | block_r = [0xE1] + [0] * (BLOCK_SIZE_BYTES - 1) | |
471 | block_v = block_y[:] | |
472 | block_z = [0] * BLOCK_SIZE_BYTES | |
473 | ||
474 | for i in block_x: | |
475 | for bit in range(7, -1, -1): | |
476 | if i & (1 << bit): | |
477 | block_z = xor(block_z, block_v) | |
478 | ||
479 | do_xor = block_v[-1] & 1 | |
480 | block_v = shift_block(block_v) | |
481 | if do_xor: | |
482 | block_v = xor(block_v, block_r) | |
483 | ||
484 | return block_z | |
485 | ||
486 | ||
487 | def ghash(subkey, data): | |
488 | # NIST SP 800-38D, Algorithm 2 | |
489 | ||
490 | if len(data) % BLOCK_SIZE_BYTES: | |
491 | raise ValueError("Length of data should be %d bytes" % BLOCK_SIZE_BYTES) | |
492 | ||
493 | last_y = [0] * BLOCK_SIZE_BYTES | |
494 | for i in range(0, len(data), BLOCK_SIZE_BYTES): | |
495 | block = data[i : i + BLOCK_SIZE_BYTES] # noqa: E203 | |
496 | last_y = block_product(xor(last_y, block), subkey) | |
497 | ||
498 | return last_y | |
499 | ||
500 | ||
501 | __all__ = [ | |
502 | 'aes_ctr_decrypt', | |
503 | 'aes_cbc_decrypt', | |
504 | 'aes_cbc_decrypt_bytes', | |
505 | 'aes_decrypt_text', | |
506 | 'aes_encrypt', | |
507 | 'aes_gcm_decrypt_and_verify', | |
508 | 'aes_gcm_decrypt_and_verify_bytes', | |
509 | 'key_expansion' | |
510 | ] |