| 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127 |
- rs = (0xee,0xa6,0xa7,0x25,0x1c,0x1e,0x72,0x91
- ,0x6d,0x11,0xc2,0xcb,0x21,0x4d,0x3c,0x25
- ,0x25,0x39,0x12,0x1d,0x8e,0x23,0x4e,0x65
- ,0x2d,0x65,0x1f,0xa4,0xc8,0xcf,0xf8,0x80)
- msg = (0x8e,0x99,0x3b,0x9f,0x48,0x68,0x12,0x73
- ,0xc2,0x96,0x50,0xba,0x32,0xfc,0x76,0xce
- ,0x48,0x33,0x2e,0xa7,0x16,0x4d,0x96,0xa4
- ,0x47,0x6f,0xb8,0xc5,0x31,0xa1,0x18,0x6a
- ,0xc0,0xdf,0xc1,0x7c,0x98,0xdc,0xe8,0x7b
- ,0x4d,0xa7,0xf0,0x11,0xec,0x48,0xc9,0x72
- ,0x71,0xd2,0xc2,0x0f,0x9b,0x92,0x8f,0xe2
- ,0x27,0x0d,0x6f,0xb8,0x63,0xd5,0x17,0x38
- ,0xb4,0x8e,0xee,0xe3,0x14,0xa7,0xcc,0x8a
- ,0xb9,0x32,0x16,0x45,0x48,0xe5,0x26,0xae
- ,0x90,0x22,0x43,0x68,0x51,0x7a,0xcf,0xea
- ,0xbd,0x6b,0xb3,0x73,0x2b,0xc0,0xe9,0xda
- ,0x99,0x83,0x2b,0x61,0xca,0x01,0xb6,0xde
- ,0x56,0x24,0x4a,0x9e,0x88,0xd5,0xf9,0xb3
- ,0x79,0x73,0xf6,0x22,0xa4,0x3d,0x14,0xa6
- ,0x59,0x9b,0x1f,0x65,0x4c,0xb4,0x5a,0x74
- ,0xe3,0x55,0xa5)
- tag = (0xf3,0xff,0xc7,0x70,0x3f,0x94,0x00,0xe5
- ,0x2a,0x7d,0xfb,0x4b,0x3d,0x33,0x05,0xd9)
- print len(msg)
- WORD = 0xffffffff
- def add(x, y):
- u = 0
- r = [0] * 17
- for i in range(17):
- u += (x[i] + y[i]) & WORD
- r[i] = u & 0xff
- u >>= 8
- return r
- def reduce(x):
- r = list(x)
- u = 0
- for i in range(16):
- u += r[i]
- r[i] = u & 0xff
- u >>= 8
- u += r[16]
- r[16] = u & 3
- u = 5 * (u >> 2)
- for i in range(16):
- u += r[i]
- r[i] = u & 0xff
- u >>= 8
- u += r[16]
- r[16] = u
- return r
- def modmul(x, y):
- r = [0] * 17
- for i in range(17):
- u = 0
- for j in range(i + 1):
- u += (x[j] * y[i - j]) & WORD
- for j in range(i + 1, 17):
- u += (320 * x[j] * y[i + 17 - j]) & WORD
- r[i] = u
- return reduce(r)
- def dump(why, v):
- print '%s = %s' % (why, ' '.join('%08x' % x for x in v))
- def freeze(x):
- # -2^130 - 5 in twos complement
- negative_130_5 = (5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 252)
- r = add(x, negative_130_5)
- dump('minusp', r)
- negative = bool(x[16] >> 7)
- if negative:
- return r
- else:
- return x
- def poly1305(msg, rs):
- r, s = list(rs[:16]), list(rs[16:])
- r[3] &= 15
- r[4] &= 252
- r[7] &= 15
- r[8] &= 252
- r[11] &= 15
- r[12] &= 252
- r[15] &= 15
- r.append(0)
- h = [0] * 17
- dump('r-init', r)
- dump('h-init', h)
- block = 0
- for offs in range(0, len(msg), 16):
- print '--- block %d ---' % block
- block += 1
- c = list(msg[offs:offs+16])
- c.append(1)
- while len(c) != 17: c.append(0)
- dump('c', c)
- h = add(h, c)
- dump('after-add', h)
- h = modmul(h, r)
- dump('after-mul', h)
- dump('end-block', h)
- h = freeze(h)
- dump('h', h)
- s.append(0)
- h = add(h, s)
- dump('final', h)
- return h[:16]
- r = poly1305(msg, rs)
- print repr([hex(x) for x in r])
|
