Created
December 27, 2013 21:15
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Python implantation of sha256
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| def sha256(data): | |
| bytes = "" | |
| h0 = 0x6a09e667 | |
| h1 = 0xbb67ae85 | |
| h2 = 0x3c6ef372 | |
| h3 = 0xa54ff53a | |
| h4 = 0x510e527f | |
| h5 = 0x9b05688c | |
| h6 = 0x1f83d9ab | |
| h7 = 0x5be0cd19 | |
| k = 64*[0] | |
| k =[ | |
| 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, | |
| 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, | |
| 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, | |
| 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, | |
| 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, | |
| 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, | |
| 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, | |
| 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2] | |
| def ror(x, y): | |
| return ((x >> y) | (x << (32-y))) & 0xFFFFFFFF | |
| for n in range(len(data)): | |
| bytes+='{0:08b}'.format(ord(data[n])) | |
| bits = bytes+"1" | |
| pBits = bits | |
| #pad until length equals 448 mod 512 | |
| while len(pBits)%512 != 448: | |
| pBits+="0" | |
| #append the original length | |
| pBits+='{0:064b}'.format(len(bits)-1) | |
| def chunks(l, n): | |
| return [l[i:i+n] for i in range(0, len(l), n)] | |
| def rol(n, b): | |
| return ((n << b) | (n >> (32 - b))) & 0xffffffff | |
| for c in chunks(pBits, 512): | |
| words = chunks(c, 32) | |
| w = [0]*64 | |
| for n in range(0, 16): | |
| w[n] = int(words[n], 2) | |
| for i in range(16, 64): | |
| s0 = ror(w[i-15], 7) ^ ror(w[i-15], 18) ^ (w[i-15] >> 3) | |
| s1 = ror(w[i-2], 17) ^ ror(w[i-2], 19) ^ (w[i-2] >> 10) | |
| w[i] = (w[i-16] + s0 + w[i-7] + s1) & 0xffffffff | |
| a = h0 | |
| b = h1 | |
| c = h2 | |
| d = h3 | |
| e = h4 | |
| f = h5 | |
| g = h6 | |
| h = h7 | |
| for i in range(0, 64): | |
| S1 = ror(e, 6) ^ ror(e, 11) ^ ror(e, 25) | |
| ch = (e & f) ^ ((~e) & g) | |
| temp1 = h + S1 + ch + k[i] + w[i] | |
| S0 = ror(a, 2) ^ ror(a, 13) ^ ror(a, 22) | |
| maj = (a & b) ^ (a & c) ^ (b & c) | |
| temp2 = S0 + maj | |
| h = g | |
| g = f | |
| f = e | |
| e = (d + temp1) & 0xffffffff | |
| d = c | |
| c = b | |
| b = a | |
| a = (temp1 + temp2) & 0xffffffff | |
| h0 = h0 + a & 0xffffffff | |
| h1 = h1 + b & 0xffffffff | |
| h2 = h2 + c & 0xffffffff | |
| h3 = h3 + d & 0xffffffff | |
| h4 = h4 + e & 0xffffffff | |
| h5 = h5 + f & 0xffffffff | |
| h6 = h6 + g & 0xffffffff | |
| h7 = h7 + h & 0xffffffff | |
| #b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9 | |
| return '%08x%08x%08x%08x%08x%08x%08x%08x' % (h0, h1, h2, h3, h4, h5, h6, h7) | |
| print sha256("hello world") |
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