Gestionnaire de fichiers - Editer - /usr/lib/python2.7/site-packages/passlib/crypto/scrypt/_gen_files.py
Arrière
"""passlib.utils.scrypt._gen_files - meta script that generates _salsa.py""" #========================================================================== # imports #========================================================================== # core import os # pkg # local #========================================================================== # constants #========================================================================== _SALSA_OPS = [ # row = (target idx, source idx 1, source idx 2, rotate) # interpreted as salsa operation over uint32... # target = (source1+source2)<<rotate ##/* Operate on columns. */ ##define R(a,b) (((a) << (b)) | ((a) >> (32 - (b)))) ##x[ 4] ^= R(x[ 0]+x[12], 7); x[ 8] ^= R(x[ 4]+x[ 0], 9); ##x[12] ^= R(x[ 8]+x[ 4],13); x[ 0] ^= R(x[12]+x[ 8],18); ( 4, 0, 12, 7), ( 8, 4, 0, 9), ( 12, 8, 4, 13), ( 0, 12, 8, 18), ##x[ 9] ^= R(x[ 5]+x[ 1], 7); x[13] ^= R(x[ 9]+x[ 5], 9); ##x[ 1] ^= R(x[13]+x[ 9],13); x[ 5] ^= R(x[ 1]+x[13],18); ( 9, 5, 1, 7), ( 13, 9, 5, 9), ( 1, 13, 9, 13), ( 5, 1, 13, 18), ##x[14] ^= R(x[10]+x[ 6], 7); x[ 2] ^= R(x[14]+x[10], 9); ##x[ 6] ^= R(x[ 2]+x[14],13); x[10] ^= R(x[ 6]+x[ 2],18); ( 14, 10, 6, 7), ( 2, 14, 10, 9), ( 6, 2, 14, 13), ( 10, 6, 2, 18), ##x[ 3] ^= R(x[15]+x[11], 7); x[ 7] ^= R(x[ 3]+x[15], 9); ##x[11] ^= R(x[ 7]+x[ 3],13); x[15] ^= R(x[11]+x[ 7],18); ( 3, 15, 11, 7), ( 7, 3, 15, 9), ( 11, 7, 3, 13), ( 15, 11, 7, 18), ##/* Operate on rows. */ ##x[ 1] ^= R(x[ 0]+x[ 3], 7); x[ 2] ^= R(x[ 1]+x[ 0], 9); ##x[ 3] ^= R(x[ 2]+x[ 1],13); x[ 0] ^= R(x[ 3]+x[ 2],18); ( 1, 0, 3, 7), ( 2, 1, 0, 9), ( 3, 2, 1, 13), ( 0, 3, 2, 18), ##x[ 6] ^= R(x[ 5]+x[ 4], 7); x[ 7] ^= R(x[ 6]+x[ 5], 9); ##x[ 4] ^= R(x[ 7]+x[ 6],13); x[ 5] ^= R(x[ 4]+x[ 7],18); ( 6, 5, 4, 7), ( 7, 6, 5, 9), ( 4, 7, 6, 13), ( 5, 4, 7, 18), ##x[11] ^= R(x[10]+x[ 9], 7); x[ 8] ^= R(x[11]+x[10], 9); ##x[ 9] ^= R(x[ 8]+x[11],13); x[10] ^= R(x[ 9]+x[ 8],18); ( 11, 10, 9, 7), ( 8, 11, 10, 9), ( 9, 8, 11, 13), ( 10, 9, 8, 18), ##x[12] ^= R(x[15]+x[14], 7); x[13] ^= R(x[12]+x[15], 9); ##x[14] ^= R(x[13]+x[12],13); x[15] ^= R(x[14]+x[13],18); ( 12, 15, 14, 7), ( 13, 12, 15, 9), ( 14, 13, 12, 13), ( 15, 14, 13, 18), ] def main(): target = os.path.join(os.path.dirname(__file__), "_salsa.py") fh = file(target, "w") write = fh.write VNAMES = ["v%d" % i for i in range(16)] PAD = " " * 4 PAD2 = " " * 8 PAD3 = " " * 12 TLIST = ", ".join("b%d" % i for i in range(16)) VLIST = ", ".join(VNAMES) kwds = dict( VLIST=VLIST, TLIST=TLIST, ) write('''\ """passlib.utils.scrypt._salsa - salsa 20/8 core, autogenerated by _gen_salsa.py""" #================================================================= # salsa function #================================================================= def salsa20(input): \"""apply the salsa20/8 core to the provided input :args input: input list containing 16 32-bit integers :returns: result list containing 16 32-bit integers \""" %(TLIST)s = input %(VLIST)s = \\ %(TLIST)s i = 0 while i < 4: ''' % kwds) for idx, (target, source1, source2, rotate) in enumerate(_SALSA_OPS): write('''\ # salsa op %(idx)d: [%(it)d] ^= ([%(is1)d]+[%(is2)d])<<<%(rot1)d t = (%(src1)s + %(src2)s) & 0xffffffff %(dst)s ^= ((t & 0x%(rmask)08x) << %(rot1)d) | (t >> %(rot2)d) ''' % dict( idx=idx, is1 = source1, is2=source2, it=target, src1=VNAMES[source1], src2=VNAMES[source2], dst=VNAMES[target], rmask=(1<<(32-rotate))-1, rot1=rotate, rot2=32-rotate, )) write('''\ i += 1 ''') for idx in range(16): write(PAD + "b%d = (b%d + v%d) & 0xffffffff\n" % (idx,idx,idx)) write('''\ return %(TLIST)s #================================================================= # eof #================================================================= ''' % kwds) if __name__ == "__main__": main() #========================================================================== # eof #==========================================================================
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