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How to use ss method in Selene

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pypy_sha256.py

Source:pypy_sha256.py

1#!/usr/bin/env python2#3# SHA256 compression function implementation below is a verbatim copy of PyPy's implementation from4# https://bitbucket.org/pypy/pypy/raw/f1f064b3faf1e012f7a9a9ab08f18074637ebe8a/lib_pypy/_sha256.py .5#6# It is licensed under the MIT license and copyright PyPy Copyright holders 2003-20157# See https://bitbucket.org/pypy/pypy/src/tip/LICENSE for the full copyright notice.8#9SHA_BLOCKSIZE = 6410SHA_DIGESTSIZE = 3211def new_shaobject():12    return {13        'digest': [0]*8,14        'count_lo': 0,15        'count_hi': 0,16        'data': [0]* SHA_BLOCKSIZE,17        'local': 0,18        'digestsize': 019    }20ROR = lambda x, y: (((x & 0xffffffff) >> (y & 31)) | (x << (32 - (y & 31)))) & 0xffffffff21Ch = lambda x, y, z: (z ^ (x & (y ^ z)))22Maj = lambda x, y, z: (((x | y) & z) | (x & y))23S = lambda x, n: ROR(x, n)24R = lambda x, n: (x & 0xffffffff) >> n25Sigma0 = lambda x: (S(x, 2) ^ S(x, 13) ^ S(x, 22))26Sigma1 = lambda x: (S(x, 6) ^ S(x, 11) ^ S(x, 25))27Gamma0 = lambda x: (S(x, 7) ^ S(x, 18) ^ R(x, 3))28Gamma1 = lambda x: (S(x, 17) ^ S(x, 19) ^ R(x, 10))29def sha_transform(sha_info):30    W = []31    d = sha_info['data']32    for i in range(0,16):33        W.append( (d[4*i]<<24) + (d[4*i+1]<<16) + (d[4*i+2]<<8) + d[4*i+3])34    for i in range(16,64):35        W.append( (Gamma1(W[i - 2]) + W[i - 7] + Gamma0(W[i - 15]) + W[i - 16]) & 0xffffffff )36    ss = sha_info['digest'][:]37    def RND(a,b,c,d,e,f,g,h,i,ki):38        t0 = h + Sigma1(e) + Ch(e, f, g) + ki + W[i];39        t1 = Sigma0(a) + Maj(a, b, c);40        d += t0;41        h  = t0 + t1;42        return d & 0xffffffff, h & 0xffffffff43    ss[3], ss[7] = RND(ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],0,0x428a2f98);44    ss[2], ss[6] = RND(ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],1,0x71374491);45    ss[1], ss[5] = RND(ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],2,0xb5c0fbcf);46    ss[0], ss[4] = RND(ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],3,0xe9b5dba5);47    ss[7], ss[3] = RND(ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],4,0x3956c25b);48    ss[6], ss[2] = RND(ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],5,0x59f111f1);49    ss[5], ss[1] = RND(ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],6,0x923f82a4);50    ss[4], ss[0] = RND(ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],7,0xab1c5ed5);51    ss[3], ss[7] = RND(ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],8,0xd807aa98);52    ss[2], ss[6] = RND(ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],9,0x12835b01);53    ss[1], ss[5] = RND(ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],10,0x243185be);54    ss[0], ss[4] = RND(ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],11,0x550c7dc3);55    ss[7], ss[3] = RND(ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],12,0x72be5d74);56    ss[6], ss[2] = RND(ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],13,0x80deb1fe);57    ss[5], ss[1] = RND(ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],14,0x9bdc06a7);58    ss[4], ss[0] = RND(ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],15,0xc19bf174);59    ss[3], ss[7] = RND(ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],16,0xe49b69c1);60    ss[2], ss[6] = RND(ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],17,0xefbe4786);61    ss[1], ss[5] = RND(ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],18,0x0fc19dc6);62    ss[0], ss[4] = RND(ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],19,0x240ca1cc);63    ss[7], ss[3] = RND(ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],20,0x2de92c6f);64    ss[6], ss[2] = RND(ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],21,0x4a7484aa);65    ss[5], ss[1] = RND(ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],22,0x5cb0a9dc);66    ss[4], ss[0] = RND(ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],23,0x76f988da);67    ss[3], ss[7] = RND(ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],24,0x983e5152);68    ss[2], ss[6] = RND(ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],25,0xa831c66d);69    ss[1], ss[5] = RND(ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],26,0xb00327c8);70    ss[0], ss[4] = RND(ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],27,0xbf597fc7);71    ss[7], ss[3] = RND(ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],28,0xc6e00bf3);72    ss[6], ss[2] = RND(ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],29,0xd5a79147);73    ss[5], ss[1] = RND(ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],30,0x06ca6351);74    ss[4], ss[0] = RND(ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],31,0x14292967);75    ss[3], ss[7] = RND(ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],32,0x27b70a85);76    ss[2], ss[6] = RND(ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],33,0x2e1b2138);77    ss[1], ss[5] = RND(ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],34,0x4d2c6dfc);78    ss[0], ss[4] = RND(ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],35,0x53380d13);79    ss[7], ss[3] = RND(ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],36,0x650a7354);80    ss[6], ss[2] = RND(ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],37,0x766a0abb);81    ss[5], ss[1] = RND(ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],38,0x81c2c92e);82    ss[4], ss[0] = RND(ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],39,0x92722c85);83    ss[3], ss[7] = RND(ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],40,0xa2bfe8a1);84    ss[2], ss[6] = RND(ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],41,0xa81a664b);85    ss[1], ss[5] = RND(ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],42,0xc24b8b70);86    ss[0], ss[4] = RND(ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],43,0xc76c51a3);87    ss[7], ss[3] = RND(ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],44,0xd192e819);88    ss[6], ss[2] = RND(ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],45,0xd6990624);89    ss[5], ss[1] = RND(ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],46,0xf40e3585);90    ss[4], ss[0] = RND(ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],47,0x106aa070);91    ss[3], ss[7] = RND(ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],48,0x19a4c116);92    ss[2], ss[6] = RND(ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],49,0x1e376c08);93    ss[1], ss[5] = RND(ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],50,0x2748774c);94    ss[0], ss[4] = RND(ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],51,0x34b0bcb5);95    ss[7], ss[3] = RND(ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],52,0x391c0cb3);96    ss[6], ss[2] = RND(ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],53,0x4ed8aa4a);97    ss[5], ss[1] = RND(ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],54,0x5b9cca4f);98    ss[4], ss[0] = RND(ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],55,0x682e6ff3);99    ss[3], ss[7] = RND(ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],56,0x748f82ee);100    ss[2], ss[6] = RND(ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],57,0x78a5636f);101    ss[1], ss[5] = RND(ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],ss[5],58,0x84c87814);102    ss[0], ss[4] = RND(ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],ss[4],59,0x8cc70208);103    ss[7], ss[3] = RND(ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],ss[3],60,0x90befffa);104    ss[6], ss[2] = RND(ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],ss[2],61,0xa4506ceb);105    ss[5], ss[1] = RND(ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],ss[1],62,0xbef9a3f7);106    ss[4], ss[0] = RND(ss[1],ss[2],ss[3],ss[4],ss[5],ss[6],ss[7],ss[0],63,0xc67178f2);107    dig = []108    for i, x in enumerate(sha_info['digest']):109        dig.append( (x + ss[i]) & 0xffffffff )110    sha_info['digest'] = dig111def sha_init():112    sha_info = new_shaobject()113    sha_info['digest'] = [0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A, 0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19]114    sha_info['count_lo'] = 0115    sha_info['count_hi'] = 0116    sha_info['local'] = 0117    sha_info['digestsize'] = 32118    return sha_info119def sha224_init():120    sha_info = new_shaobject()121    sha_info['digest'] = [0xc1059ed8, 0x367cd507, 0x3070dd17, 0xf70e5939, 0xffc00b31, 0x68581511, 0x64f98fa7, 0xbefa4fa4]122    sha_info['count_lo'] = 0123    sha_info['count_hi'] = 0124    sha_info['local'] = 0125    sha_info['digestsize'] = 28126    return sha_info127def sha_update(sha_info, buffer):128    if isinstance(buffer, str):129        raise TypeError("Unicode strings must be encoded before hashing")130    count = len(buffer)131    buffer_idx = 0132    clo = (sha_info['count_lo'] + (count << 3)) & 0xffffffff133    if clo < sha_info['count_lo']:134        sha_info['count_hi'] += 1135    sha_info['count_lo'] = clo136    sha_info['count_hi'] += (count >> 29)137    if sha_info['local']:138        i = SHA_BLOCKSIZE - sha_info['local']139        if i > count:140            i = count141        # copy buffer142        sha_info['data'][sha_info['local']:sha_info['local']+i] = buffer[buffer_idx:buffer_idx+i]143        count -= i144        buffer_idx += i145        sha_info['local'] += i146        if sha_info['local'] == SHA_BLOCKSIZE:147            sha_transform(sha_info)148            sha_info['local'] = 0149        else:150            return151    while count >= SHA_BLOCKSIZE:152        # copy buffer153        sha_info['data'] = list(buffer[buffer_idx:buffer_idx + SHA_BLOCKSIZE])154        count -= SHA_BLOCKSIZE155        buffer_idx += SHA_BLOCKSIZE156        sha_transform(sha_info)157    # copy buffer158    pos = sha_info['local']159    sha_info['data'][pos:pos+count] = buffer[buffer_idx:buffer_idx + count]160    sha_info['local'] = count161def sha_final(sha_info):162    lo_bit_count = sha_info['count_lo']163    hi_bit_count = sha_info['count_hi']164    count = (lo_bit_count >> 3) & 0x3f165    sha_info['data'][count] = 0x80;166    count += 1167    if count > SHA_BLOCKSIZE - 8:168        # zero the bytes in data after the count169        sha_info['data'] = sha_info['data'][:count] + ([0] * (SHA_BLOCKSIZE - count))170        sha_transform(sha_info)171        # zero bytes in data172        sha_info['data'] = [0] * SHA_BLOCKSIZE173    else:174        sha_info['data'] = sha_info['data'][:count] + ([0] * (SHA_BLOCKSIZE - count))175    sha_info['data'][56] = (hi_bit_count >> 24) & 0xff176    sha_info['data'][57] = (hi_bit_count >> 16) & 0xff177    sha_info['data'][58] = (hi_bit_count >>  8) & 0xff178    sha_info['data'][59] = (hi_bit_count >>  0) & 0xff179    sha_info['data'][60] = (lo_bit_count >> 24) & 0xff180    sha_info['data'][61] = (lo_bit_count >> 16) & 0xff181    sha_info['data'][62] = (lo_bit_count >>  8) & 0xff182    sha_info['data'][63] = (lo_bit_count >>  0) & 0xff183    sha_transform(sha_info)184    dig = []185    for i in sha_info['digest']:186        dig.extend([ ((i>>24) & 0xff), ((i>>16) & 0xff), ((i>>8) & 0xff), (i & 0xff) ])187    return ''.join([chr(i) for i in dig])188class sha256(object):189    digest_size = digestsize = SHA_DIGESTSIZE190    block_size = SHA_BLOCKSIZE191    def __init__(self, s=None):192        self._sha = sha_init()193        if s:194            sha_update(self._sha, s)195    def update(self, s):196        sha_update(self._sha, s)197    def digest(self):198        return sha_final(self._sha.copy())[:self._sha['digestsize']]199    def hexdigest(self):200        return ''.join(['%.2x' % ord(i) for i in self.digest()])201    def copy(self):202        new = sha256.__new__(sha256)203        new._sha = self._sha.copy()204        return new205class sha224(sha256):206    digest_size = digestsize = 28207    def __init__(self, s=None):208        self._sha = sha224_init()209        if s:210            sha_update(self._sha, s)211    def copy(self):212        new = sha224.__new__(sha224)213        new._sha = self._sha.copy()214        return new215def test():216    a_str = "just a test string"217    assert 'e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855' == sha256().hexdigest()218    assert 'd7b553c6f09ac85d142415f857c5310f3bbbe7cdd787cce4b985acedd585266f' == sha256(a_str).hexdigest()219    assert '8113ebf33c97daa9998762aacafe750c7cefc2b2f173c90c59663a57fe626f21' == sha256(a_str*7).hexdigest()220    s = sha256(a_str)221    s.update(a_str)222    assert '03d9963e05a094593190b6fc794cb1a3e1ac7d7883f0b5855268afeccc70d461' == s.hexdigest()223if __name__ == "__main__":...

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