60 lines
2.3 KiB
Python
60 lines
2.3 KiB
Python
def rot_r(a: int, n: int) -> int:
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return ((a >> n) | (a << (32 - n))) & 0xffffffff
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def ch(x: int, y: int, z: int) -> int:
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return z ^ (x & (y ^ z))
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def maj(x: int, y: int, z: int) -> int:
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return (x & y) ^ (x & z) ^ (y & z)
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def sigma0(x: int) -> int:
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return rot_r(x, 2) ^ rot_r(x, 13) ^ rot_r(x, 22)
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def sigma1(x: int) -> int:
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return rot_r(x, 6) ^ rot_r(x, 11) ^ rot_r(x, 25)
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def gamma0(x: int) -> int:
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return rot_r(x, 7) ^ rot_r(x, 18) ^ (x >> 3)
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def gamma1(x: int) -> int:
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return rot_r(x, 17) ^ rot_r(x, 19) ^ (x >> 10)
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K = [
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0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
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0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
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0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
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0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
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0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
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0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
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0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
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0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
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]
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def sha256(data: bytes) -> bytes:
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H = [
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0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
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0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19
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]
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message = data + b'\x80'
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message += b'\x00' * ((56 - len(message) % 64) % 64)
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message += (len(data) * 8).to_bytes(8, 'big')
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for i_ in range(len(message) // 64):
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block = message[i_ * 64:(i_ + 1) * 64]
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w = [int.from_bytes(block[i * 4:(i + 1) * 4], 'big') for i in range(16)]
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for i in range(48):
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w.append((gamma1(w[-2]) + w[-7] + gamma0(w[-15]) + w[-16]) & 0xffffffff)
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g = H.copy()
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for i in range(64):
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t1 = (g[7] + sigma1(g[4]) + ch(g[4], g[5], g[6]) + K[i] + w[i]) & 0xffffffff
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t2 = (sigma0(g[0]) + maj(g[0], g[1], g[2])) & 0xffffffff
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g = (t1 + t2) & 0xffffffff, g[0], g[1], g[2], (g[3] + t1) & 0xffffffff, g[4], g[5], g[6]
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H = [(x + y) & 0xffffffff for x, y in zip(H, g)]
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return b''.join([x.to_bytes(4, 'big') for x in H])
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