| 1 | ### -*-python-*- |
| 2 | ### |
| 3 | ### Setup for Catacomb/Python bindings |
| 4 | ### |
| 5 | ### (c) 2004 Straylight/Edgeware |
| 6 | ### |
| 7 | |
| 8 | ###----- Licensing notice --------------------------------------------------- |
| 9 | ### |
| 10 | ### This file is part of the Python interface to Catacomb. |
| 11 | ### |
| 12 | ### Catacomb/Python is free software; you can redistribute it and/or modify |
| 13 | ### it under the terms of the GNU General Public License as published by |
| 14 | ### the Free Software Foundation; either version 2 of the License, or |
| 15 | ### (at your option) any later version. |
| 16 | ### |
| 17 | ### Catacomb/Python is distributed in the hope that it will be useful, |
| 18 | ### but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | ### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | ### GNU General Public License for more details. |
| 21 | ### |
| 22 | ### You should have received a copy of the GNU General Public License |
| 23 | ### along with Catacomb/Python; if not, write to the Free Software Foundation, |
| 24 | ### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 25 | |
| 26 | import _base |
| 27 | import types as _types |
| 28 | from binascii import hexlify as _hexify, unhexlify as _unhexify |
| 29 | from sys import argv as _argv |
| 30 | |
| 31 | ###-------------------------------------------------------------------------- |
| 32 | ### Basic stuff. |
| 33 | |
| 34 | ## For the benefit of the default keyreporter, we need the program na,e. |
| 35 | _base._ego(_argv[0]) |
| 36 | |
| 37 | ## Initialize the module. Drag in the static methods of the various |
| 38 | ## classes; create names for the various known crypto algorithms. |
| 39 | def _init(): |
| 40 | d = globals() |
| 41 | b = _base.__dict__; |
| 42 | for i in b: |
| 43 | if i[0] != '_': |
| 44 | d[i] = b[i]; |
| 45 | for i in ['MP', 'GF', 'Field', |
| 46 | 'ECPt', 'ECPtCurve', 'ECCurve', 'ECInfo', |
| 47 | 'DHInfo', 'BinDHInfo', 'RSAPriv', 'BBSPriv', |
| 48 | 'PrimeFilter', 'RabinMiller', |
| 49 | 'Group', 'GE', |
| 50 | 'KeySZ', 'KeyData']: |
| 51 | c = d[i] |
| 52 | pre = '_' + i + '_' |
| 53 | plen = len(pre) |
| 54 | for j in b: |
| 55 | if j[:plen] == pre: |
| 56 | setattr(c, j[plen:], classmethod(b[j])) |
| 57 | for i in [gcciphers, gchashes, gcmacs, gcprps]: |
| 58 | for c in i.itervalues(): |
| 59 | d[c.name.replace('-', '_').translate(None, '/')] = c |
| 60 | for c in gccrands.itervalues(): |
| 61 | d[c.name.replace('-', '_').translate(None, '/') + 'rand'] = c |
| 62 | _init() |
| 63 | |
| 64 | ## A handy function for our work: add the methods of a named class to an |
| 65 | ## existing class. This is how we write the Python-implemented parts of our |
| 66 | ## mostly-C types. |
| 67 | def _augment(c, cc): |
| 68 | for i in cc.__dict__: |
| 69 | a = cc.__dict__[i] |
| 70 | if type(a) is _types.MethodType: |
| 71 | a = a.im_func |
| 72 | elif type(a) not in (_types.FunctionType, staticmethod, classmethod): |
| 73 | continue |
| 74 | setattr(c, i, a) |
| 75 | |
| 76 | ## Parsing functions tend to return the object parsed and the remainder of |
| 77 | ## the input. This checks that the remainder is input and, if so, returns |
| 78 | ## just the object. |
| 79 | def _checkend(r): |
| 80 | x, rest = r |
| 81 | if rest != '': |
| 82 | raise SyntaxError, 'junk at end of string' |
| 83 | return x |
| 84 | |
| 85 | ###-------------------------------------------------------------------------- |
| 86 | ### Bytestrings. |
| 87 | |
| 88 | class _tmp: |
| 89 | def fromhex(x): |
| 90 | return ByteString(_unhexify(x)) |
| 91 | fromhex = staticmethod(fromhex) |
| 92 | def __hex__(me): |
| 93 | return _hexify(me) |
| 94 | def __repr__(me): |
| 95 | return 'bytes(%r)' % hex(me) |
| 96 | _augment(ByteString, _tmp) |
| 97 | ByteString.__hash__ = str.__hash__ |
| 98 | bytes = ByteString.fromhex |
| 99 | |
| 100 | ###-------------------------------------------------------------------------- |
| 101 | ### Hashing. |
| 102 | |
| 103 | class _tmp: |
| 104 | def check(me, h): |
| 105 | hh = me.done() |
| 106 | return ctstreq(h, hh) |
| 107 | _augment(GHash, _tmp) |
| 108 | _augment(Poly1305Hash, _tmp) |
| 109 | |
| 110 | ###-------------------------------------------------------------------------- |
| 111 | ### NaCl `secretbox'. |
| 112 | |
| 113 | def secret_box(k, n, m): |
| 114 | E = xsalsa20(k).setiv(n) |
| 115 | r = E.enczero(poly1305.keysz.default) |
| 116 | s = E.enczero(poly1305.masksz) |
| 117 | y = E.encrypt(m) |
| 118 | t = poly1305(r)(s).hash(y).done() |
| 119 | return ByteString(t + y) |
| 120 | |
| 121 | def secret_unbox(k, n, c): |
| 122 | E = xsalsa20(k).setiv(n) |
| 123 | r = E.enczero(poly1305.keysz.default) |
| 124 | s = E.enczero(poly1305.masksz) |
| 125 | y = c[poly1305.tagsz:] |
| 126 | if not poly1305(r)(s).hash(y).check(c[0:poly1305.tagsz]): |
| 127 | raise ValueError, 'decryption failed' |
| 128 | return E.decrypt(c[poly1305.tagsz:]) |
| 129 | |
| 130 | ###-------------------------------------------------------------------------- |
| 131 | ### Multiprecision integers and binary polynomials. |
| 132 | |
| 133 | def _split_rat(x): |
| 134 | if isinstance(x, BaseRat): return x._n, x._d |
| 135 | else: return x, 1 |
| 136 | class BaseRat (object): |
| 137 | """Base class implementing fields of fractions over Euclidean domains.""" |
| 138 | def __new__(cls, a, b): |
| 139 | a, b = cls.RING(a), cls.RING(b) |
| 140 | q, r = divmod(a, b) |
| 141 | if r == 0: return q |
| 142 | g = b.gcd(r) |
| 143 | me = super(BaseRat, cls).__new__(cls) |
| 144 | me._n = a//g |
| 145 | me._d = b//g |
| 146 | return me |
| 147 | @property |
| 148 | def numer(me): return me._n |
| 149 | @property |
| 150 | def denom(me): return me._d |
| 151 | def __str__(me): return '%s/%s' % (me._n, me._d) |
| 152 | def __repr__(me): return '%s(%s, %s)' % (type(me).__name__, me._n, me._d) |
| 153 | |
| 154 | def __add__(me, you): |
| 155 | n, d = _split_rat(you) |
| 156 | return type(me)(me._n*d + n*me._d, d*me._d) |
| 157 | __radd__ = __add__ |
| 158 | def __sub__(me, you): |
| 159 | n, d = _split_rat(you) |
| 160 | return type(me)(me._n*d - n*me._d, d*me._d) |
| 161 | def __rsub__(me, you): |
| 162 | n, d = _split_rat(you) |
| 163 | return type(me)(n*me._d - me._n*d, d*me._d) |
| 164 | def __mul__(me, you): |
| 165 | n, d = _split_rat(you) |
| 166 | return type(me)(me._n*n, me._d*d) |
| 167 | def __div__(me, you): |
| 168 | n, d = _split_rat(you) |
| 169 | return type(me)(me._n*d, me._d*n) |
| 170 | def __rdiv__(me, you): |
| 171 | n, d = _split_rat(you) |
| 172 | return type(me)(me._d*n, me._n*d) |
| 173 | def __cmp__(me, you): |
| 174 | n, d = _split_rat(you) |
| 175 | return type(me)(me._n*d, n*me._d) |
| 176 | def __rcmp__(me, you): |
| 177 | n, d = _split_rat(you) |
| 178 | return cmp(n*me._d, me._n*d) |
| 179 | |
| 180 | class IntRat (BaseRat): |
| 181 | RING = MP |
| 182 | |
| 183 | class GFRat (BaseRat): |
| 184 | RING = GF |
| 185 | |
| 186 | class _tmp: |
| 187 | def negp(x): return x < 0 |
| 188 | def posp(x): return x > 0 |
| 189 | def zerop(x): return x == 0 |
| 190 | def oddp(x): return x.testbit(0) |
| 191 | def evenp(x): return not x.testbit(0) |
| 192 | def mont(x): return MPMont(x) |
| 193 | def barrett(x): return MPBarrett(x) |
| 194 | def reduce(x): return MPReduce(x) |
| 195 | def __div__(me, you): return IntRat(me, you) |
| 196 | def __rdiv__(me, you): return IntRat(you, me) |
| 197 | _augment(MP, _tmp) |
| 198 | |
| 199 | class _tmp: |
| 200 | def zerop(x): return x == 0 |
| 201 | def reduce(x): return GFReduce(x) |
| 202 | def trace(x, y): return x.reduce().trace(y) |
| 203 | def halftrace(x, y): return x.reduce().halftrace(y) |
| 204 | def modsqrt(x, y): return x.reduce().sqrt(y) |
| 205 | def quadsolve(x, y): return x.reduce().quadsolve(y) |
| 206 | def __div__(me, you): return GFRat(me, you) |
| 207 | def __rdiv__(me, you): return GFRat(you, me) |
| 208 | _augment(GF, _tmp) |
| 209 | |
| 210 | class _tmp: |
| 211 | def product(*arg): |
| 212 | 'product(ITERABLE) or product(I, ...) -> PRODUCT' |
| 213 | return MPMul(*arg).done() |
| 214 | product = staticmethod(product) |
| 215 | _augment(MPMul, _tmp) |
| 216 | |
| 217 | ###-------------------------------------------------------------------------- |
| 218 | ### Abstract fields. |
| 219 | |
| 220 | class _tmp: |
| 221 | def fromstring(str): return _checkend(Field.parse(str)) |
| 222 | fromstring = staticmethod(fromstring) |
| 223 | _augment(Field, _tmp) |
| 224 | |
| 225 | class _tmp: |
| 226 | def __repr__(me): return '%s(%sL)' % (type(me).__name__, me.p) |
| 227 | def __hash__(me): return 0x114401de ^ hash(me.p) |
| 228 | def ec(me, a, b): return ECPrimeProjCurve(me, a, b) |
| 229 | _augment(PrimeField, _tmp) |
| 230 | |
| 231 | class _tmp: |
| 232 | def __repr__(me): return '%s(%#xL)' % (type(me).__name__, me.p) |
| 233 | def ec(me, a, b): return ECBinProjCurve(me, a, b) |
| 234 | _augment(BinField, _tmp) |
| 235 | |
| 236 | class _tmp: |
| 237 | def __hash__(me): return 0x23e4701c ^ hash(me.p) |
| 238 | _augment(BinPolyField, _tmp) |
| 239 | |
| 240 | class _tmp: |
| 241 | def __hash__(me): |
| 242 | h = 0x9a7d6240 |
| 243 | h ^= hash(me.p) |
| 244 | h ^= 2*hash(me.beta) & 0xffffffff |
| 245 | return h |
| 246 | _augment(BinNormField, _tmp) |
| 247 | |
| 248 | class _tmp: |
| 249 | def __str__(me): return str(me.value) |
| 250 | def __repr__(me): return '%s(%s)' % (repr(me.field), repr(me.value)) |
| 251 | _augment(FE, _tmp) |
| 252 | |
| 253 | ###-------------------------------------------------------------------------- |
| 254 | ### Elliptic curves. |
| 255 | |
| 256 | class _tmp: |
| 257 | def __repr__(me): |
| 258 | return '%s(%r, %s, %s)' % (type(me).__name__, me.field, me.a, me.b) |
| 259 | def frombuf(me, s): |
| 260 | return ecpt.frombuf(me, s) |
| 261 | def fromraw(me, s): |
| 262 | return ecpt.fromraw(me, s) |
| 263 | def pt(me, *args): |
| 264 | return me(*args) |
| 265 | _augment(ECCurve, _tmp) |
| 266 | |
| 267 | class _tmp: |
| 268 | def __hash__(me): |
| 269 | h = 0x6751d341 |
| 270 | h ^= hash(me.field) |
| 271 | h ^= 2*hash(me.a) ^ 0xffffffff |
| 272 | h ^= 5*hash(me.b) ^ 0xffffffff |
| 273 | return h |
| 274 | _augment(ECPrimeCurve, _tmp) |
| 275 | |
| 276 | class _tmp: |
| 277 | def __hash__(me): |
| 278 | h = 0x2ac203c5 |
| 279 | h ^= hash(me.field) |
| 280 | h ^= 2*hash(me.a) ^ 0xffffffff |
| 281 | h ^= 5*hash(me.b) ^ 0xffffffff |
| 282 | return h |
| 283 | _augment(ECBinCurve, _tmp) |
| 284 | |
| 285 | class _tmp: |
| 286 | def __repr__(me): |
| 287 | if not me: return 'ECPt()' |
| 288 | return 'ECPt(%s, %s)' % (me.ix, me.iy) |
| 289 | def __str__(me): |
| 290 | if not me: return 'inf' |
| 291 | return '(%s, %s)' % (me.ix, me.iy) |
| 292 | _augment(ECPt, _tmp) |
| 293 | |
| 294 | class _tmp: |
| 295 | def __repr__(me): |
| 296 | return 'ECInfo(curve = %r, G = %r, r = %s, h = %s)' % \ |
| 297 | (me.curve, me.G, me.r, me.h) |
| 298 | def __hash__(me): |
| 299 | h = 0x9bedb8de |
| 300 | h ^= hash(me.curve) |
| 301 | h ^= 2*hash(me.G) & 0xffffffff |
| 302 | return h |
| 303 | def group(me): |
| 304 | return ECGroup(me) |
| 305 | _augment(ECInfo, _tmp) |
| 306 | |
| 307 | class _tmp: |
| 308 | def __repr__(me): |
| 309 | if not me: return '%r()' % (me.curve) |
| 310 | return '%r(%s, %s)' % (me.curve, me.x, me.y) |
| 311 | def __str__(me): |
| 312 | if not me: return 'inf' |
| 313 | return '(%s, %s)' % (me.x, me.y) |
| 314 | _augment(ECPtCurve, _tmp) |
| 315 | |
| 316 | ###-------------------------------------------------------------------------- |
| 317 | ### Key sizes. |
| 318 | |
| 319 | class _tmp: |
| 320 | def __repr__(me): return 'KeySZAny(%d)' % me.default |
| 321 | def check(me, sz): return True |
| 322 | def best(me, sz): return sz |
| 323 | _augment(KeySZAny, _tmp) |
| 324 | |
| 325 | class _tmp: |
| 326 | def __repr__(me): |
| 327 | return 'KeySZRange(%d, %d, %d, %d)' % \ |
| 328 | (me.default, me.min, me.max, me.mod) |
| 329 | def check(me, sz): return me.min <= sz <= me.max and sz % me.mod == 0 |
| 330 | def best(me, sz): |
| 331 | if sz < me.min: raise ValueError, 'key too small' |
| 332 | elif sz > me.max: return me.max |
| 333 | else: return sz - (sz % me.mod) |
| 334 | _augment(KeySZRange, _tmp) |
| 335 | |
| 336 | class _tmp: |
| 337 | def __repr__(me): return 'KeySZSet(%d, %s)' % (me.default, me.set) |
| 338 | def check(me, sz): return sz in me.set |
| 339 | def best(me, sz): |
| 340 | found = -1 |
| 341 | for i in me.set: |
| 342 | if found < i <= sz: found = i |
| 343 | if found < 0: raise ValueError, 'key too small' |
| 344 | return found |
| 345 | _augment(KeySZSet, _tmp) |
| 346 | |
| 347 | ###-------------------------------------------------------------------------- |
| 348 | ### Abstract groups. |
| 349 | |
| 350 | class _tmp: |
| 351 | def __repr__(me): |
| 352 | return '%s(p = %s, r = %s, g = %s)' % \ |
| 353 | (type(me).__name__, me.p, me.r, me.g) |
| 354 | _augment(FGInfo, _tmp) |
| 355 | |
| 356 | class _tmp: |
| 357 | def group(me): return PrimeGroup(me) |
| 358 | _augment(DHInfo, _tmp) |
| 359 | |
| 360 | class _tmp: |
| 361 | def group(me): return BinGroup(me) |
| 362 | _augment(BinDHInfo, _tmp) |
| 363 | |
| 364 | class _tmp: |
| 365 | def __repr__(me): |
| 366 | return '%s(%r)' % (type(me).__name__, me.info) |
| 367 | _augment(Group, _tmp) |
| 368 | |
| 369 | class _tmp: |
| 370 | def __hash__(me): |
| 371 | info = me.info |
| 372 | h = 0xbce3cfe6 |
| 373 | h ^= hash(info.p) |
| 374 | h ^= 2*hash(info.r) & 0xffffffff |
| 375 | h ^= 5*hash(info.g) & 0xffffffff |
| 376 | return h |
| 377 | _augment(PrimeGroup, _tmp) |
| 378 | |
| 379 | class _tmp: |
| 380 | def __hash__(me): |
| 381 | info = me.info |
| 382 | h = 0x80695949 |
| 383 | h ^= hash(info.p) |
| 384 | h ^= 2*hash(info.r) & 0xffffffff |
| 385 | h ^= 5*hash(info.g) & 0xffffffff |
| 386 | return h |
| 387 | _augment(BinGroup, _tmp) |
| 388 | |
| 389 | class _tmp: |
| 390 | def __hash__(me): return 0x0ec23dab ^ hash(me.info) |
| 391 | _augment(ECGroup, _tmp) |
| 392 | |
| 393 | class _tmp: |
| 394 | def __repr__(me): |
| 395 | return '%r(%r)' % (me.group, str(me)) |
| 396 | _augment(GE, _tmp) |
| 397 | |
| 398 | ###-------------------------------------------------------------------------- |
| 399 | ### RSA encoding techniques. |
| 400 | |
| 401 | class PKCS1Crypt (object): |
| 402 | def __init__(me, ep = '', rng = rand): |
| 403 | me.ep = ep |
| 404 | me.rng = rng |
| 405 | def encode(me, msg, nbits): |
| 406 | return _base._p1crypt_encode(msg, nbits, me.ep, me.rng) |
| 407 | def decode(me, ct, nbits): |
| 408 | return _base._p1crypt_decode(ct, nbits, me.ep, me.rng) |
| 409 | |
| 410 | class PKCS1Sig (object): |
| 411 | def __init__(me, ep = '', rng = rand): |
| 412 | me.ep = ep |
| 413 | me.rng = rng |
| 414 | def encode(me, msg, nbits): |
| 415 | return _base._p1sig_encode(msg, nbits, me.ep, me.rng) |
| 416 | def decode(me, msg, sig, nbits): |
| 417 | return _base._p1sig_decode(msg, sig, nbits, me.ep, me.rng) |
| 418 | |
| 419 | class OAEP (object): |
| 420 | def __init__(me, mgf = sha_mgf, hash = sha, ep = '', rng = rand): |
| 421 | me.mgf = mgf |
| 422 | me.hash = hash |
| 423 | me.ep = ep |
| 424 | me.rng = rng |
| 425 | def encode(me, msg, nbits): |
| 426 | return _base._oaep_encode(msg, nbits, me.mgf, me.hash, me.ep, me.rng) |
| 427 | def decode(me, ct, nbits): |
| 428 | return _base._oaep_decode(ct, nbits, me.mgf, me.hash, me.ep, me.rng) |
| 429 | |
| 430 | class PSS (object): |
| 431 | def __init__(me, mgf = sha_mgf, hash = sha, saltsz = None, rng = rand): |
| 432 | me.mgf = mgf |
| 433 | me.hash = hash |
| 434 | if saltsz is None: |
| 435 | saltsz = hash.hashsz |
| 436 | me.saltsz = saltsz |
| 437 | me.rng = rng |
| 438 | def encode(me, msg, nbits): |
| 439 | return _base._pss_encode(msg, nbits, me.mgf, me.hash, me.saltsz, me.rng) |
| 440 | def decode(me, msg, sig, nbits): |
| 441 | return _base._pss_decode(msg, sig, nbits, |
| 442 | me.mgf, me.hash, me.saltsz, me.rng) |
| 443 | |
| 444 | class _tmp: |
| 445 | def encrypt(me, msg, enc): |
| 446 | return me.pubop(enc.encode(msg, me.n.nbits)) |
| 447 | def verify(me, msg, sig, enc): |
| 448 | if msg is None: return enc.decode(msg, me.pubop(sig), me.n.nbits) |
| 449 | try: |
| 450 | x = enc.decode(msg, me.pubop(sig), me.n.nbits) |
| 451 | return x is None or x == msg |
| 452 | except ValueError: |
| 453 | return False |
| 454 | _augment(RSAPub, _tmp) |
| 455 | |
| 456 | class _tmp: |
| 457 | def decrypt(me, ct, enc): return enc.decode(me.privop(ct), me.n.nbits) |
| 458 | def sign(me, msg, enc): return me.privop(enc.encode(msg, me.n.nbits)) |
| 459 | _augment(RSAPriv, _tmp) |
| 460 | |
| 461 | ###-------------------------------------------------------------------------- |
| 462 | ### Bernstein's elliptic curve crypto and related schemes. |
| 463 | |
| 464 | X25519_BASE = \ |
| 465 | bytes('0900000000000000000000000000000000000000000000000000000000000000') |
| 466 | |
| 467 | X448_BASE = \ |
| 468 | bytes('05000000000000000000000000000000000000000000000000000000' |
| 469 | '00000000000000000000000000000000000000000000000000000000') |
| 470 | |
| 471 | Z128 = bytes('00000000000000000000000000000000') |
| 472 | |
| 473 | class _BoxyPub (object): |
| 474 | def __init__(me, pub, *kw, **kwargs): |
| 475 | if len(pub) != me._PUBSZ: raise ValueError, 'bad public key' |
| 476 | super(_BoxyPub, me).__init__(*kw, **kwargs) |
| 477 | me.pub = pub |
| 478 | |
| 479 | class _BoxyPriv (_BoxyPub): |
| 480 | def __init__(me, priv, pub = None, *kw, **kwargs): |
| 481 | if len(priv) != me._KEYSZ: raise ValueError, 'bad private key' |
| 482 | if pub is None: pub = me._op(priv, me._BASE) |
| 483 | super(_BoxyPriv, me).__init__(pub = pub, *kw, **kwargs) |
| 484 | me.priv = priv |
| 485 | def agree(me, you): return me._op(me.priv, you.pub) |
| 486 | def boxkey(me, recip): |
| 487 | return me._hashkey(me.agree(recip)) |
| 488 | def box(me, recip, n, m): |
| 489 | return secret_box(me.boxkey(recip), n, m) |
| 490 | def unbox(me, recip, n, c): |
| 491 | return secret_unbox(me.boxkey(recip, n, c)) |
| 492 | |
| 493 | class X25519Pub (_BoxyPub): |
| 494 | _PUBSZ = X25519_PUBSZ |
| 495 | _BASE = X25519_BASE |
| 496 | |
| 497 | class X25519Priv (_BoxyPriv, X25519Pub): |
| 498 | _KEYSZ = X25519_KEYSZ |
| 499 | def _op(me, k, X): return x25519(k, X) |
| 500 | def _hashkey(me, z): return hsalsa20_prf(z, Z128) |
| 501 | |
| 502 | class X448Pub (_BoxyPub): |
| 503 | _PUBSZ = X448_PUBSZ |
| 504 | _BASE = X448_BASE |
| 505 | |
| 506 | class X448Priv (_BoxyPriv, X448Pub): |
| 507 | _KEYSZ = X448_KEYSZ |
| 508 | def _op(me, k, X): return x448(k, X) |
| 509 | ##def _hashkey(me, z): return ??? |
| 510 | |
| 511 | class Ed25519Pub (object): |
| 512 | def __init__(me, pub): |
| 513 | me.pub = pub |
| 514 | def verify(me, msg, sig): |
| 515 | return ed25519_verify(me.pub, msg, sig) |
| 516 | |
| 517 | class Ed25519Priv (Ed25519Pub): |
| 518 | def __init__(me, priv): |
| 519 | me.priv = priv |
| 520 | Ed25519Pub.__init__(me, ed25519_pubkey(priv)) |
| 521 | def sign(me, msg): |
| 522 | return ed25519_sign(me.priv, msg, pub = me.pub) |
| 523 | @classmethod |
| 524 | def generate(cls, rng = rand): |
| 525 | return cls(rng.block(ED25519_KEYSZ)) |
| 526 | |
| 527 | ###-------------------------------------------------------------------------- |
| 528 | ### Built-in named curves and prime groups. |
| 529 | |
| 530 | class _groupmap (object): |
| 531 | def __init__(me, map, nth): |
| 532 | me.map = map |
| 533 | me.nth = nth |
| 534 | me._n = max(map.values()) + 1 |
| 535 | me.i = me._n*[None] |
| 536 | def __repr__(me): |
| 537 | return '{%s}' % ', '.join(['%r: %r' % (k, me[k]) for k in me]) |
| 538 | def __len__(me): |
| 539 | return me._n |
| 540 | def __contains__(me, k): |
| 541 | return k in me.map |
| 542 | def __getitem__(me, k): |
| 543 | i = me.map[k] |
| 544 | if me.i[i] is None: |
| 545 | me.i[i] = me.nth(i) |
| 546 | return me.i[i] |
| 547 | def __setitem__(me, k, v): |
| 548 | raise TypeError, "immutable object" |
| 549 | def __iter__(me): |
| 550 | return iter(me.map) |
| 551 | def iterkeys(me): |
| 552 | return iter(me.map) |
| 553 | def itervalues(me): |
| 554 | for k in me: |
| 555 | yield me[k] |
| 556 | def iteritems(me): |
| 557 | for k in me: |
| 558 | yield k, me[k] |
| 559 | def keys(me): |
| 560 | return [k for k in me] |
| 561 | def values(me): |
| 562 | return [me[k] for k in me] |
| 563 | def items(me): |
| 564 | return [(k, me[k]) for k in me] |
| 565 | eccurves = _groupmap(_base._eccurves, ECInfo._curven) |
| 566 | primegroups = _groupmap(_base._pgroups, DHInfo._groupn) |
| 567 | bingroups = _groupmap(_base._bingroups, BinDHInfo._groupn) |
| 568 | |
| 569 | ###-------------------------------------------------------------------------- |
| 570 | ### Prime number generation. |
| 571 | |
| 572 | class PrimeGenEventHandler (object): |
| 573 | def pg_begin(me, ev): |
| 574 | return me.pg_try(ev) |
| 575 | def pg_done(me, ev): |
| 576 | return PGEN_DONE |
| 577 | def pg_abort(me, ev): |
| 578 | return PGEN_TRY |
| 579 | def pg_fail(me, ev): |
| 580 | return PGEN_TRY |
| 581 | def pg_pass(me, ev): |
| 582 | return PGEN_TRY |
| 583 | |
| 584 | class SophieGermainStepJump (object): |
| 585 | def pg_begin(me, ev): |
| 586 | me.lf = PrimeFilter(ev.x) |
| 587 | me.hf = me.lf.muladd(2, 1) |
| 588 | return me.cont(ev) |
| 589 | def pg_try(me, ev): |
| 590 | me.step() |
| 591 | return me.cont(ev) |
| 592 | def cont(me, ev): |
| 593 | while me.lf.status == PGEN_FAIL or me.hf.status == PGEN_FAIL: |
| 594 | me.step() |
| 595 | if me.lf.status == PGEN_ABORT or me.hf.status == PGEN_ABORT: |
| 596 | return PGEN_ABORT |
| 597 | ev.x = me.lf.x |
| 598 | if me.lf.status == PGEN_DONE and me.hf.status == PGEN_DONE: |
| 599 | return PGEN_DONE |
| 600 | return PGEN_TRY |
| 601 | def pg_done(me, ev): |
| 602 | del me.lf |
| 603 | del me.hf |
| 604 | |
| 605 | class SophieGermainStepper (SophieGermainStepJump): |
| 606 | def __init__(me, step): |
| 607 | me.lstep = step; |
| 608 | me.hstep = 2 * step |
| 609 | def step(me): |
| 610 | me.lf.step(me.lstep) |
| 611 | me.hf.step(me.hstep) |
| 612 | |
| 613 | class SophieGermainJumper (SophieGermainStepJump): |
| 614 | def __init__(me, jump): |
| 615 | me.ljump = PrimeFilter(jump); |
| 616 | me.hjump = me.ljump.muladd(2, 0) |
| 617 | def step(me): |
| 618 | me.lf.jump(me.ljump) |
| 619 | me.hf.jump(me.hjump) |
| 620 | def pg_done(me, ev): |
| 621 | del me.ljump |
| 622 | del me.hjump |
| 623 | SophieGermainStepJump.pg_done(me, ev) |
| 624 | |
| 625 | class SophieGermainTester (object): |
| 626 | def __init__(me): |
| 627 | pass |
| 628 | def pg_begin(me, ev): |
| 629 | me.lr = RabinMiller(ev.x) |
| 630 | me.hr = RabinMiller(2 * ev.x + 1) |
| 631 | def pg_try(me, ev): |
| 632 | lst = me.lr.test(ev.rng.range(me.lr.x)) |
| 633 | if lst != PGEN_PASS and lst != PGEN_DONE: |
| 634 | return lst |
| 635 | rst = me.hr.test(ev.rng.range(me.hr.x)) |
| 636 | if rst != PGEN_PASS and rst != PGEN_DONE: |
| 637 | return rst |
| 638 | if lst == PGEN_DONE and rst == PGEN_DONE: |
| 639 | return PGEN_DONE |
| 640 | return PGEN_PASS |
| 641 | def pg_done(me, ev): |
| 642 | del me.lr |
| 643 | del me.hr |
| 644 | |
| 645 | class PrimitiveStepper (PrimeGenEventHandler): |
| 646 | def __init__(me): |
| 647 | pass |
| 648 | def pg_try(me, ev): |
| 649 | ev.x = me.i.next() |
| 650 | return PGEN_TRY |
| 651 | def pg_begin(me, ev): |
| 652 | me.i = iter(smallprimes) |
| 653 | return me.pg_try(ev) |
| 654 | |
| 655 | class PrimitiveTester (PrimeGenEventHandler): |
| 656 | def __init__(me, mod, hh = [], exp = None): |
| 657 | me.mod = MPMont(mod) |
| 658 | me.exp = exp |
| 659 | me.hh = hh |
| 660 | def pg_try(me, ev): |
| 661 | x = ev.x |
| 662 | if me.exp is not None: |
| 663 | x = me.mod.exp(x, me.exp) |
| 664 | if x == 1: return PGEN_FAIL |
| 665 | for h in me.hh: |
| 666 | if me.mod.exp(x, h) == 1: return PGEN_FAIL |
| 667 | ev.x = x |
| 668 | return PGEN_DONE |
| 669 | |
| 670 | class SimulStepper (PrimeGenEventHandler): |
| 671 | def __init__(me, mul = 2, add = 1, step = 2): |
| 672 | me.step = step |
| 673 | me.mul = mul |
| 674 | me.add = add |
| 675 | def _stepfn(me, step): |
| 676 | if step <= 0: |
| 677 | raise ValueError, 'step must be positive' |
| 678 | if step <= MPW_MAX: |
| 679 | return lambda f: f.step(step) |
| 680 | j = PrimeFilter(step) |
| 681 | return lambda f: f.jump(j) |
| 682 | def pg_begin(me, ev): |
| 683 | x = ev.x |
| 684 | me.lf = PrimeFilter(x) |
| 685 | me.hf = PrimeFilter(x * me.mul + me.add) |
| 686 | me.lstep = me._stepfn(me.step) |
| 687 | me.hstep = me._stepfn(me.step * me.mul) |
| 688 | SimulStepper._cont(me, ev) |
| 689 | def pg_try(me, ev): |
| 690 | me._step() |
| 691 | me._cont(ev) |
| 692 | def _step(me): |
| 693 | me.lstep(me.lf) |
| 694 | me.hstep(me.hf) |
| 695 | def _cont(me, ev): |
| 696 | while me.lf.status == PGEN_FAIL or me.hf.status == PGEN_FAIL: |
| 697 | me._step() |
| 698 | if me.lf.status == PGEN_ABORT or me.hf.status == PGEN_ABORT: |
| 699 | return PGEN_ABORT |
| 700 | ev.x = me.lf.x |
| 701 | if me.lf.status == PGEN_DONE and me.hf.status == PGEN_DONE: |
| 702 | return PGEN_DONE |
| 703 | return PGEN_TRY |
| 704 | def pg_done(me, ev): |
| 705 | del me.lf |
| 706 | del me.hf |
| 707 | del me.lstep |
| 708 | del me.hstep |
| 709 | |
| 710 | class SimulTester (PrimeGenEventHandler): |
| 711 | def __init__(me, mul = 2, add = 1): |
| 712 | me.mul = mul |
| 713 | me.add = add |
| 714 | def pg_begin(me, ev): |
| 715 | x = ev.x |
| 716 | me.lr = RabinMiller(x) |
| 717 | me.hr = RabinMiller(x * me.mul + me.add) |
| 718 | def pg_try(me, ev): |
| 719 | lst = me.lr.test(ev.rng.range(me.lr.x)) |
| 720 | if lst != PGEN_PASS and lst != PGEN_DONE: |
| 721 | return lst |
| 722 | rst = me.hr.test(ev.rng.range(me.hr.x)) |
| 723 | if rst != PGEN_PASS and rst != PGEN_DONE: |
| 724 | return rst |
| 725 | if lst == PGEN_DONE and rst == PGEN_DONE: |
| 726 | return PGEN_DONE |
| 727 | return PGEN_PASS |
| 728 | def pg_done(me, ev): |
| 729 | del me.lr |
| 730 | del me.hr |
| 731 | |
| 732 | def sgprime(start, step = 2, name = 'p', event = pgen_nullev, nsteps = 0): |
| 733 | start = MP(start) |
| 734 | return pgen(start, name, SimulStepper(step = step), SimulTester(), event, |
| 735 | nsteps, RabinMiller.iters(start.nbits)) |
| 736 | |
| 737 | def findprimitive(mod, hh = [], exp = None, name = 'g', event = pgen_nullev): |
| 738 | return pgen(0, name, PrimitiveStepper(), PrimitiveTester(mod, hh, exp), |
| 739 | event, 0, 1) |
| 740 | |
| 741 | def kcdsaprime(pbits, qbits, rng = rand, |
| 742 | event = pgen_nullev, name = 'p', nsteps = 0): |
| 743 | hbits = pbits - qbits |
| 744 | h = pgen(rng.mp(hbits, 1), name + ' [h]', |
| 745 | PrimeGenStepper(2), PrimeGenTester(), |
| 746 | event, nsteps, RabinMiller.iters(hbits)) |
| 747 | q = pgen(rng.mp(qbits, 1), name, SimulStepper(2 * h, 1, 2), |
| 748 | SimulTester(2 * h, 1), event, nsteps, RabinMiller.iters(qbits)) |
| 749 | p = 2 * q * h + 1 |
| 750 | return p, q, h |
| 751 | |
| 752 | #----- That's all, folks ---------------------------------------------------- |