Module refinery.units.crypto.cipher.sm4

Classes

class SM4 (key, mode)

Helper class that provides a standard way to create an ABC using inheritance.

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class SM4(BlockCipher):

    block_size = 16
    key_size = {16}

    _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_sbox = [
        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,
    ]

    @property
    def key(self):
        return self._key

    @key.setter
    def key(self, key):
        a, b, c, d = struct.unpack('>4L', key)
        a ^= 0xA3B1BAC6
        b ^= 0x56AA3350
        c ^= 0x677D9197
        d ^= 0xB27022DC
        key = []
        for v in self._sm4_ck:
            a, b, c, d = b, c, d, a ^ self.tau(b ^ c ^ d ^ v, 13, 23)
            key.append(d)
        self._key = key

    @classmethod
    def tau(cls, x: int, *shifts) -> int:
        s = cls._sm4_sbox
        t = (s[x & 0xFF]
            | s[x >> 0x08 & 0xFF] << 0x08
            | s[x >> 0x10 & 0xFF] << 0x10
            | s[x >> 0x18 & 0xFF] << 0x18)
        y = t
        for shift in shifts:
            y ^= rotl32(t, shift)
        return y

    def block_encrypt(self, data: BufferType) -> BufferType:
        a, b, c, d = struct.unpack('>4L', data)
        for k in self.key:
            a, b, c, d = b, c, d, a ^ self.tau(b ^ c ^ d ^ k, 2, 10, 18, 24)
        return struct.pack('>4L', d, c, b, a)

    def block_decrypt(self, data: BufferType) -> BufferType:
        d, c, b, a = struct.unpack('>4L', data)
        for k in reversed(self.key):
            d, c, b, a = c, b, a, d ^ self.tau(a ^ b ^ c ^ k, 2, 10, 18, 24)
        return struct.pack('>4L', a, b, c, d)

Ancestors

• BlockCipher
• CipherInterface
• abc.ABC

Class variables

var mode

var block_size

var key_size

Static methods

def tau(x, *shifts)

Expand source code Browse git

@classmethod
def tau(cls, x: int, *shifts) -> int:
    s = cls._sm4_sbox
    t = (s[x & 0xFF]
        | s[x >> 0x08 & 0xFF] << 0x08
        | s[x >> 0x10 & 0xFF] << 0x10
        | s[x >> 0x18 & 0xFF] << 0x18)
    y = t
    for shift in shifts:
        y ^= rotl32(t, shift)
    return y

Instance variables

var key

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@property
def key(self):
    return self._key

Methods

def block_encrypt(self, data)

Expand source code Browse git

def block_encrypt(self, data: BufferType) -> BufferType:
    a, b, c, d = struct.unpack('>4L', data)
    for k in self.key:
        a, b, c, d = b, c, d, a ^ self.tau(b ^ c ^ d ^ k, 2, 10, 18, 24)
    return struct.pack('>4L', d, c, b, a)

def block_decrypt(self, data)

Expand source code Browse git

def block_decrypt(self, data: BufferType) -> BufferType:
    d, c, b, a = struct.unpack('>4L', data)
    for k in reversed(self.key):
        d, c, b, a = c, b, a, d ^ self.tau(a ^ b ^ c ^ k, 2, 10, 18, 24)
    return struct.pack('>4L', a, b, c, d)

class sm4 (key, iv=b'', *, padding=None, mode=None, raw=False, little_endian=False, segment_size=0, mac_len=0, assoc_len=0)

The SM4 symmetric blockcipher algorithm published as GB/T 32907-2016 by the State Cryptography Administration of China (SCA).

Expand source code Browse git

class sm4(StandardBlockCipherUnit, cipher=BlockCipherFactory(SM4)):
    """
    The SM4 symmetric blockcipher algorithm published as GB/T 32907-2016 by the State Cryptography
    Administration of China (SCA).
    """
    pass

Ancestors

• StandardBlockCipherUnit
• BlockCipherUnitBase
• StandardCipherUnit
• CipherUnit
• Unit
• UnitBase
• Entry

Class variables

var block_size

var key_size

Inherited members

• StandardBlockCipherUnit:
  • Arg
  • assemble
  • filter
  • finish
  • handles
  • labelled
  • log_debug
  • log_detach
  • log_fail
  • log_info
  • log_level
  • log_warn
  • nozzle
  • process
  • read
  • read1
  • reverse
  • run
  • source
  • superinit