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Filename :
_sha256.py
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import struct SHA_BLOCKSIZE = 64 SHA_DIGESTSIZE = 32 def new_shaobject(): return { 'digest': [0]*8, 'count_lo': 0, 'count_hi': 0, 'data': [0]* SHA_BLOCKSIZE, 'local': 0, 'digestsize': 0 } ROR = lambda x, y: (((x & 0xffffffff) >> (y & 31)) | (x << (32 - (y & 31)))) & 0xffffffff Ch = lambda x, y, z: (z ^ (x & (y ^ z))) Maj = lambda x, y, z: (((x | y) & z) | (x & y)) S = lambda x, n: ROR(x, n) R = lambda x, n: (x & 0xffffffff) >> n Sigma0 = lambda x: (S(x, 2) ^ S(x, 13) ^ S(x, 22)) Sigma1 = lambda x: (S(x, 6) ^ S(x, 11) ^ S(x, 25)) Gamma0 = lambda x: (S(x, 7) ^ S(x, 18) ^ R(x, 3)) Gamma1 = lambda x: (S(x, 17) ^ S(x, 19) ^ R(x, 10)) def sha_transform(sha_info): W = [] d = sha_info['data'] for i in xrange(0,16): W.append( (d[4*i]<<24) + (d[4*i+1]<<16) + (d[4*i+2]<<8) + d[4*i+3]) for i in xrange(16,64): W.append( (Gamma1(W[i - 2]) + W[i - 7] + Gamma0(W[i - 15]) + W[i - 16]) & 0xffffffff ) ss = sha_info['digest'][:] def RND(a,b,c,d,e,f,g,h,i,ki): t0 = h + Sigma1(e) + Ch(e, f, g) + ki + W[i]; t1 = Sigma0(a) + Maj(a, b, c); d += t0; h = t0 + t1; return d & 0xffffffff, h & 0xffffffff ss[3], ss[7] = RND(ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],0,0x428a2f98); ss[2], ss[6] = RND(ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],1,0x71374491); ss[1], ss[5] = RND(ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],2,0xb5c0fbcf); ss[0], ss[4] = RND(ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],3,0xe9b5dba5); ss[7], ss[3] = RND(ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],4,0x3956c25b); ss[6], ss[2] = RND(ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],5,0x59f111f1); ss[5], ss[1] = RND(ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],6,0x923f82a4); ss[4], ss[0] = RND(ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],7,0xab1c5ed5); ss[3], ss[7] = RND(ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],8,0xd807aa98); ss[2], ss[6] = RND(ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],9,0x12835b01); ss[1], ss[5] = RND(ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],10,0x243185be); ss[0], ss[4] = RND(ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],11,0x550c7dc3); ss[7], ss[3] = RND(ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],12,0x72be5d74); ss[6], ss[2] = RND(ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],13,0x80deb1fe); ss[5], ss[1] = RND(ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],14,0x9bdc06a7); ss[4], ss[0] = RND(ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],15,0xc19bf174); ss[3], ss[7] = RND(ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],16,0xe49b69c1); ss[2], ss[6] = RND(ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],17,0xefbe4786); ss[1], ss[5] = RND(ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],18,0x0fc19dc6); ss[0], ss[4] = RND(ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],19,0x240ca1cc); ss[7], ss[3] = RND(ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],20,0x2de92c6f); ss[6], ss[2] = RND(ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],21,0x4a7484aa); ss[5], ss[1] = RND(ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],22,0x5cb0a9dc); ss[4], ss[0] = RND(ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],23,0x76f988da); ss[3], ss[7] = RND(ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],24,0x983e5152); ss[2], ss[6] = RND(ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],25,0xa831c66d); ss[1], ss[5] = RND(ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],26,0xb00327c8); ss[0], ss[4] = RND(ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],27,0xbf597fc7); ss[7], ss[3] = RND(ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],28,0xc6e00bf3); ss[6], ss[2] = RND(ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],29,0xd5a79147); ss[5], ss[1] = RND(ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],30,0x06ca6351); ss[4], ss[0] = RND(ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],31,0x14292967); ss[3], ss[7] = RND(ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],32,0x27b70a85); ss[2], ss[6] = RND(ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],33,0x2e1b2138); ss[1], ss[5] = RND(ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],34,0x4d2c6dfc); ss[0], ss[4] = RND(ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],35,0x53380d13); ss[7], ss[3] = RND(ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],36,0x650a7354); ss[6], ss[2] = RND(ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],37,0x766a0abb); ss[5], ss[1] = RND(ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],38,0x81c2c92e); ss[4], ss[0] = RND(ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],39,0x92722c85); ss[3], ss[7] = RND(ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],40,0xa2bfe8a1); ss[2], ss[6] = RND(ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],41,0xa81a664b); ss[1], ss[5] = RND(ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],42,0xc24b8b70); ss[0], ss[4] = RND(ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],43,0xc76c51a3); ss[7], ss[3] = RND(ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],44,0xd192e819); ss[6], ss[2] = RND(ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],45,0xd6990624); ss[5], ss[1] = RND(ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],46,0xf40e3585); ss[4], ss[0] = RND(ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],47,0x106aa070); ss[3], ss[7] = RND(ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],48,0x19a4c116); ss[2], ss[6] = RND(ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],49,0x1e376c08); ss[1], ss[5] = RND(ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],50,0x2748774c); ss[0], ss[4] = RND(ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],51,0x34b0bcb5); ss[7], ss[3] = RND(ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],52,0x391c0cb3); ss[6], ss[2] = RND(ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],53,0x4ed8aa4a); ss[5], ss[1] = RND(ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],54,0x5b9cca4f); ss[4], ss[0] = RND(ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],55,0x682e6ff3); ss[3], ss[7] = RND(ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],56,0x748f82ee); ss[2], ss[6] = RND(ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],57,0x78a5636f); ss[1], ss[5] = RND(ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],58,0x84c87814); ss[0], ss[4] = RND(ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],59,0x8cc70208); ss[7], ss[3] = RND(ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],60,0x90befffa); ss[6], ss[2] = RND(ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],61,0xa4506ceb); ss[5], ss[1] = RND(ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],62,0xbef9a3f7); ss[4], ss[0] = RND(ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],63,0xc67178f2); dig = [] for i, x in enumerate(sha_info['digest']): dig.append( (x + ss[i]) & 0xffffffff ) sha_info['digest'] = dig def sha_init(): sha_info = new_shaobject() sha_info['digest'] = [0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A, 0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19] sha_info['count_lo'] = 0 sha_info['count_hi'] = 0 sha_info['local'] = 0 sha_info['digestsize'] = 32 return sha_info def sha224_init(): sha_info = new_shaobject() sha_info['digest'] = [0xc1059ed8, 0x367cd507, 0x3070dd17, 0xf70e5939, 0xffc00b31, 0x68581511, 0x64f98fa7, 0xbefa4fa4] sha_info['count_lo'] = 0 sha_info['count_hi'] = 0 sha_info['local'] = 0 sha_info['digestsize'] = 28 return sha_info def getbuf(s): if isinstance(s, str): return s elif isinstance(s, unicode): return str(s) else: return buffer(s) def sha_update(sha_info, buffer): count = len(buffer) buffer_idx = 0 clo = (sha_info['count_lo'] + (count << 3)) & 0xffffffff if clo < sha_info['count_lo']: sha_info['count_hi'] += 1 sha_info['count_lo'] = clo sha_info['count_hi'] += (count >> 29) if sha_info['local']: i = SHA_BLOCKSIZE - sha_info['local'] if i > count: i = count # copy buffer for x in enumerate(buffer[buffer_idx:buffer_idx+i]): sha_info['data'][sha_info['local']+x[0]] = struct.unpack('B', x[1])[0] count -= i buffer_idx += i sha_info['local'] += i if sha_info['local'] == SHA_BLOCKSIZE: sha_transform(sha_info) sha_info['local'] = 0 else: return while count >= SHA_BLOCKSIZE: # copy buffer sha_info['data'] = [struct.unpack('B',c)[0] for c in buffer[buffer_idx:buffer_idx + SHA_BLOCKSIZE]] count -= SHA_BLOCKSIZE buffer_idx += SHA_BLOCKSIZE sha_transform(sha_info) # copy buffer pos = sha_info['local'] sha_info['data'][pos:pos+count] = [struct.unpack('B',c)[0] for c in buffer[buffer_idx:buffer_idx + count]] sha_info['local'] = count def sha_final(sha_info): lo_bit_count = sha_info['count_lo'] hi_bit_count = sha_info['count_hi'] count = (lo_bit_count >> 3) & 0x3f sha_info['data'][count] = 0x80; count += 1 if count > SHA_BLOCKSIZE - 8: # zero the bytes in data after the count sha_info['data'] = sha_info['data'][:count] + ([0] * (SHA_BLOCKSIZE - count)) sha_transform(sha_info) # zero bytes in data sha_info['data'] = [0] * SHA_BLOCKSIZE else: sha_info['data'] = sha_info['data'][:count] + ([0] * (SHA_BLOCKSIZE - count)) sha_info['data'][56] = (hi_bit_count >> 24) & 0xff sha_info['data'][57] = (hi_bit_count >> 16) & 0xff sha_info['data'][58] = (hi_bit_count >> 8) & 0xff sha_info['data'][59] = (hi_bit_count >> 0) & 0xff sha_info['data'][60] = (lo_bit_count >> 24) & 0xff sha_info['data'][61] = (lo_bit_count >> 16) & 0xff sha_info['data'][62] = (lo_bit_count >> 8) & 0xff sha_info['data'][63] = (lo_bit_count >> 0) & 0xff sha_transform(sha_info) dig = [] for i in sha_info['digest']: dig.extend([ ((i>>24) & 0xff), ((i>>16) & 0xff), ((i>>8) & 0xff), (i & 0xff) ]) return ''.join([chr(i) for i in dig]) class sha256(object): digest_size = digestsize = SHA_DIGESTSIZE block_size = SHA_BLOCKSIZE def __init__(self, s=None): self._sha = sha_init() if s: sha_update(self._sha, getbuf(s)) def update(self, s): sha_update(self._sha, getbuf(s)) def digest(self): return sha_final(self._sha.copy())[:self._sha['digestsize']] def hexdigest(self): return ''.join(['%.2x' % ord(i) for i in self.digest()]) def copy(self): new = sha256.__new__(sha256) new._sha = self._sha.copy() return new class sha224(sha256): digest_size = digestsize = 28 def __init__(self, s=None): self._sha = sha224_init() if s: sha_update(self._sha, getbuf(s)) def copy(self): new = sha224.__new__(sha224) new._sha = self._sha.copy() return new if __name__ == "__main__": a_str = "just a test string" assert 'e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855' == sha256().hexdigest() assert 'd7b553c6f09ac85d142415f857c5310f3bbbe7cdd787cce4b985acedd585266f' == sha256(a_str).hexdigest() assert '8113ebf33c97daa9998762aacafe750c7cefc2b2f173c90c59663a57fe626f21' == sha256(a_str*7).hexdigest() s = sha256(a_str) s.update(a_str) assert '03d9963e05a094593190b6fc794cb1a3e1ac7d7883f0b5855268afeccc70d461' == s.hexdigest()