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pysm4.py
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pysm4.py
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#-*-coding:utf-8-*-
''' pysm4 implementation '''
import copy
#Expanded SM4 box table
SM4_BOXES_TABLE = [
0xd6, 0x90, 0xe9, 0xfe, 0xcc, 0xe1, 0x3d, 0xb7, 0x16, 0xb6, 0x14, 0xc2, 0x28, 0xfb, 0x2c,
0x05, 0x2b, 0x67, 0x9a, 0x76, 0x2a, 0xbe, 0x04, 0xc3, 0xaa, 0x44, 0x13, 0x26, 0x49, 0x86,
0x06, 0x99, 0x9c, 0x42, 0x50, 0xf4, 0x91, 0xef, 0x98, 0x7a, 0x33, 0x54, 0x0b, 0x43, 0xed,
0xcf, 0xac, 0x62, 0xe4, 0xb3, 0x1c, 0xa9, 0xc9, 0x08, 0xe8, 0x95, 0x80, 0xdf, 0x94, 0xfa,
0x75, 0x8f, 0x3f, 0xa6, 0x47, 0x07, 0xa7, 0xfc, 0xf3, 0x73, 0x17, 0xba, 0x83, 0x59, 0x3c,
0x19, 0xe6, 0x85, 0x4f, 0xa8, 0x68, 0x6b, 0x81, 0xb2, 0x71, 0x64, 0xda, 0x8b, 0xf8, 0xeb,
0x0f, 0x4b, 0x70, 0x56, 0x9d, 0x35, 0x1e, 0x24, 0x0e, 0x5e, 0x63, 0x58, 0xd1, 0xa2, 0x25,
0x22, 0x7c, 0x3b, 0x01, 0x21, 0x78, 0x87, 0xd4, 0x00, 0x46, 0x57, 0x9f, 0xd3, 0x27, 0x52,
0x4c, 0x36, 0x02, 0xe7, 0xa0, 0xc4, 0xc8, 0x9e, 0xea, 0xbf, 0x8a, 0xd2, 0x40, 0xc7, 0x38,
0xb5, 0xa3, 0xf7, 0xf2, 0xce, 0xf9, 0x61, 0x15, 0xa1, 0xe0, 0xae, 0x5d, 0xa4, 0x9b, 0x34,
0x1a, 0x55, 0xad, 0x93, 0x32, 0x30, 0xf5, 0x8c, 0xb1, 0xe3, 0x1d, 0xf6, 0xe2, 0x2e, 0x82,
0x66, 0xca, 0x60, 0xc0, 0x29, 0x23, 0xab, 0x0d, 0x53, 0x4e, 0x6f, 0xd5, 0xdb, 0x37, 0x45,
0xde, 0xfd, 0x8e, 0x2f, 0x03, 0xff, 0x6a, 0x72, 0x6d, 0x6c, 0x5b, 0x51, 0x8d, 0x1b, 0xaf,
0x92, 0xbb, 0xdd, 0xbc, 0x7f, 0x11, 0xd9, 0x5c, 0x41, 0x1f, 0x10, 0x5a, 0xd8, 0x0a, 0xc1,
0x31, 0x88, 0xa5, 0xcd, 0x7b, 0xbd, 0x2d, 0x74, 0xd0, 0x12, 0xb8, 0xe5, 0xb4, 0xb0, 0x89,
0x69, 0x97, 0x4a, 0x0c, 0x96, 0x77, 0x7e, 0x65, 0xb9, 0xf1, 0x09, 0xc5, 0x6e, 0xc6, 0x84,
0x18, 0xf0, 0x7d, 0xec, 0x3a, 0xdc, 0x4d, 0x20, 0x79, 0xee, 0x5f, 0x3e, 0xd7, 0xcb, 0x39,
0x48,
]
# System parameter
SM4_FK = [0xa3b1bac6, 0x56aa3350, 0x677d9197, 0xb27022dc]
# fixed parameter
SM4_CK = [
0x00070e15, 0x1c232a31, 0x383f464d, 0x545b6269,
0x70777e85, 0x8c939aa1, 0xa8afb6bd, 0xc4cbd2d9,
0xe0e7eef5, 0xfc030a11, 0x181f262d, 0x343b4249,
0x50575e65, 0x6c737a81, 0x888f969d, 0xa4abb2b9,
0xc0c7ced5, 0xdce3eaf1, 0xf8ff060d, 0x141b2229,
0x30373e45, 0x4c535a61, 0x686f767d, 0x848b9299,
0xa0a7aeb5, 0xbcc3cad1, 0xd8dfe6ed, 0xf4fb0209,
0x10171e25, 0x2c333a41, 0x484f565d, 0x646b7279
]
SM4_ENCRYPT = 0
SM4_DECRYPT = 1
def rotl(x, n):
return ((x << n) & 0xffffffff) | ((x >> (32 - n)) & 0xffffffff)
def get_uint32_be(key_data):
return (key_data[0] << 24) | (key_data[1] << 16) | (key_data[2] << 8) | (key_data[3])
def put_uint32_be(n):
return [((n >> 24) & 0xff), ((n >> 16) & 0xff), ((n >> 8) & 0xff), ((n) & 0xff)]
class CryptSM4(object):
def __init__(self, mode=SM4_ENCRYPT):
self.sk = [0]*32
self.mode = mode
# Calculating round encryption key.
# args: [in] a: a is a 32 bits unsigned value;
# return: sk[i]: i{0,1,2,3,...31}.
@classmethod
def _round_key(cls, ka):
b = [0, 0, 0, 0]
a = put_uint32_be(ka)
b[0] = SM4_BOXES_TABLE[a[0]]
b[1] = SM4_BOXES_TABLE[a[1]]
b[2] = SM4_BOXES_TABLE[a[2]]
b[3] = SM4_BOXES_TABLE[a[3]]
bb = get_uint32_be(b[0:4])
rk = bb ^ (rotl(bb, 13)) ^ (rotl(bb, 23))
return rk
# Calculating and getting encryption/decryption contents.
# args: [in] x0: original contents;
# args: [in] x1: original contents;
# args: [in] x2: original contents;
# args: [in] x3: original contents;
# args: [in] rk: encryption/decryption key;
# return the contents of encryption/decryption contents.
@classmethod
def _f(cls, x0, x1, x2, x3, rk):
# "T algorithm" == "L algorithm" + "t algorithm".
# args: [in] a: a is a 32 bits unsigned value;
# return: c: c is calculated with line algorithm "L" and nonline algorithm "t"
def _sm4_l_t(ka):
b = [0, 0, 0, 0]
a = put_uint32_be(ka)
b[0] = SM4_BOXES_TABLE[a[0]]
b[1] = SM4_BOXES_TABLE[a[1]]
b[2] = SM4_BOXES_TABLE[a[2]]
b[3] = SM4_BOXES_TABLE[a[3]]
bb = get_uint32_be(b[0:4])
c = bb ^ (rotl(bb, 2)) ^ (rotl(bb, 10)) ^ (rotl(bb, 18)) ^ (rotl(bb, 24))
return c
return x0 ^ _sm4_l_t(x1 ^ x2 ^ x3 ^ rk)
def set_key(self, key, mode):
k = [0]*36
MK = [0, 0, 0, 0]
MK[0] = get_uint32_be(key[0:4])
MK[1] = get_uint32_be(key[4:8])
MK[2] = get_uint32_be(key[8:12])
MK[3] = get_uint32_be(key[12:16])
k[0:4] = list(map(lambda x, y: x ^ y, MK[0:4], SM4_FK[0:4]))
for i in range(32):
k[i + 4] = k[i] ^ (
self._round_key(k[i + 1] ^ k[i + 2] ^ k[i + 3] ^ SM4_CK[i]))
self.sk[i] = k[i + 4]
self.mode = mode
if mode == SM4_DECRYPT:
for idx in range(16):
t = self.sk[idx]
self.sk[idx] = self.sk[31 - idx]
self.sk[31 - idx] = t
def one_round(self, sk, in_put):
out_put = []
ulbuf = [0]*36
ulbuf[0] = get_uint32_be(in_put[0:4])
ulbuf[1] = get_uint32_be(in_put[4:8])
ulbuf[2] = get_uint32_be(in_put[8:12])
ulbuf[3] = get_uint32_be(in_put[12:16])
for idx in range(32):
ulbuf[idx + 4] = self._f(ulbuf[idx], ulbuf[idx + 1],
ulbuf[idx + 2], ulbuf[idx + 3], sk[idx])
out_put += put_uint32_be(ulbuf[35])
out_put += put_uint32_be(ulbuf[34])
out_put += put_uint32_be(ulbuf[33])
out_put += put_uint32_be(ulbuf[32])
return out_put
def crypt_ecb(self, input_data):
''' SM4-ECB block encryption/decryption '''
i = 0
output_data = []
length = len(input_data)
while length > 0:
output_data += self.one_round(self.sk, input_data[i:i+16])
i += 16
length -= 16
return bytes(output_data)
def crypt_cbc(self, iv, input_data):
''' SM4-CBC buffer encryption/decryption '''
i = 0
output_data = []
tmp_input = [0]*16
if self.mode == SM4_ENCRYPT:
length = len(input_data)
while length > 0:
tmp_input[0:16] = list(map(lambda x, y: x ^ y, input_data[i:i+16], iv[0:16]))
output_data += self.one_round(self.sk, tmp_input[0:16])
iv = copy.deepcopy(output_data[i:i+16])
i += 16
length -= 16
return bytes(output_data)
else:
length = len(input_data)
while length > 0:
output_data += self.one_round(self.sk, input_data[i:i+16])
output_data[i:i+16] = list(map(lambda x, y: x ^ y, output_data[i:i+16], iv[0:16]))
iv = copy.deepcopy(input_data[i:i + 16])
i += 16
length -= 16
return bytes(output_data)