Line data Source code
1 : /* ecc-curves.c - Elliptic Curve parameter mangement
2 : * Copyright (C) 2007, 2008, 2010, 2011 Free Software Foundation, Inc.
3 : * Copyright (C) 2013 g10 Code GmbH
4 : *
5 : * This file is part of Libgcrypt.
6 : *
7 : * Libgcrypt is free software; you can redistribute it and/or modify
8 : * it under the terms of the GNU Lesser General Public License as
9 : * published by the Free Software Foundation; either version 2.1 of
10 : * the License, or (at your option) any later version.
11 : *
12 : * Libgcrypt is distributed in the hope that it will be useful,
13 : * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 : * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 : * GNU Lesser General Public License for more details.
16 : *
17 : * You should have received a copy of the GNU Lesser General Public
18 : * License along with this program; if not, see <http://www.gnu.org/licenses/>.
19 : */
20 :
21 : #include <config.h>
22 : #include <stdio.h>
23 : #include <stdlib.h>
24 : #include <string.h>
25 : #include <errno.h>
26 :
27 : #include "g10lib.h"
28 : #include "mpi.h"
29 : #include "cipher.h"
30 : #include "context.h"
31 : #include "ec-context.h"
32 : #include "pubkey-internal.h"
33 : #include "ecc-common.h"
34 :
35 :
36 : /* This tables defines aliases for curve names. */
37 : static const struct
38 : {
39 : const char *name; /* Our name. */
40 : const char *other; /* Other name. */
41 : } curve_aliases[] =
42 : {
43 : { "Curve25519", "1.3.6.1.4.1.3029.1.5.1" },
44 : { "Ed25519", "1.3.6.1.4.1.11591.15.1" },
45 :
46 : { "NIST P-192", "1.2.840.10045.3.1.1" }, /* X9.62 OID */
47 : { "NIST P-192", "prime192v1" }, /* X9.62 name. */
48 : { "NIST P-192", "secp192r1" }, /* SECP name. */
49 : { "NIST P-192", "nistp192" }, /* rfc5656. */
50 :
51 : { "NIST P-224", "secp224r1" },
52 : { "NIST P-224", "1.3.132.0.33" }, /* SECP OID. */
53 : { "NIST P-224", "nistp224" }, /* rfc5656. */
54 :
55 : { "NIST P-256", "1.2.840.10045.3.1.7" }, /* From NIST SP 800-78-1. */
56 : { "NIST P-256", "prime256v1" },
57 : { "NIST P-256", "secp256r1" },
58 : { "NIST P-256", "nistp256" }, /* rfc5656. */
59 :
60 : { "NIST P-384", "secp384r1" },
61 : { "NIST P-384", "1.3.132.0.34" },
62 : { "NIST P-384", "nistp384" }, /* rfc5656. */
63 :
64 : { "NIST P-521", "secp521r1" },
65 : { "NIST P-521", "1.3.132.0.35" },
66 : { "NIST P-521", "nistp521" }, /* rfc5656. */
67 :
68 : { "brainpoolP160r1", "1.3.36.3.3.2.8.1.1.1" },
69 : { "brainpoolP192r1", "1.3.36.3.3.2.8.1.1.3" },
70 : { "brainpoolP224r1", "1.3.36.3.3.2.8.1.1.5" },
71 : { "brainpoolP256r1", "1.3.36.3.3.2.8.1.1.7" },
72 : { "brainpoolP320r1", "1.3.36.3.3.2.8.1.1.9" },
73 : { "brainpoolP384r1", "1.3.36.3.3.2.8.1.1.11"},
74 : { "brainpoolP512r1", "1.3.36.3.3.2.8.1.1.13"},
75 :
76 : { "GOST2001-test", "1.2.643.2.2.35.0" },
77 : { "GOST2001-CryptoPro-A", "1.2.643.2.2.35.1" },
78 : { "GOST2001-CryptoPro-B", "1.2.643.2.2.35.2" },
79 : { "GOST2001-CryptoPro-C", "1.2.643.2.2.35.3" },
80 : { "GOST2001-CryptoPro-A", "GOST2001-CryptoPro-XchA" },
81 : { "GOST2001-CryptoPro-C", "GOST2001-CryptoPro-XchB" },
82 : { "GOST2001-CryptoPro-A", "1.2.643.2.2.36.0" },
83 : { "GOST2001-CryptoPro-C", "1.2.643.2.2.36.1" },
84 :
85 : { "GOST2012-tc26-A", "1.2.643.7.1.2.1.2.1" },
86 : { "GOST2012-tc26-B", "1.2.643.7.1.2.1.2.2" },
87 :
88 : { "secp256k1", "1.3.132.0.10" },
89 :
90 : { NULL, NULL}
91 : };
92 :
93 :
94 : typedef struct
95 : {
96 : const char *desc; /* Description of the curve. */
97 : unsigned int nbits; /* Number of bits. */
98 : unsigned int fips:1; /* True if this is a FIPS140-2 approved curve. */
99 :
100 : /* The model describing this curve. This is mainly used to select
101 : the group equation. */
102 : enum gcry_mpi_ec_models model;
103 :
104 : /* The actual ECC dialect used. This is used for curve specific
105 : optimizations and to select encodings etc. */
106 : enum ecc_dialects dialect;
107 :
108 : const char *p; /* The prime defining the field. */
109 : const char *a, *b; /* The coefficients. For Twisted Edwards
110 : Curves b is used for d. For Montgomery
111 : Curves (a,b) has ((A-2)/4,B^-1). */
112 : const char *n; /* The order of the base point. */
113 : const char *g_x, *g_y; /* Base point. */
114 : const char *h; /* Cofactor. */
115 : } ecc_domain_parms_t;
116 :
117 :
118 : /* This static table defines all available curves. */
119 : static const ecc_domain_parms_t domain_parms[] =
120 : {
121 : {
122 : /* (-x^2 + y^2 = 1 + dx^2y^2) */
123 : "Ed25519", 256, 0,
124 : MPI_EC_EDWARDS, ECC_DIALECT_ED25519,
125 : "0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFED",
126 : "-0x01",
127 : "-0x2DFC9311D490018C7338BF8688861767FF8FF5B2BEBE27548A14B235ECA6874A",
128 : "0x1000000000000000000000000000000014DEF9DEA2F79CD65812631A5CF5D3ED",
129 : "0x216936D3CD6E53FEC0A4E231FDD6DC5C692CC7609525A7B2C9562D608F25D51A",
130 : "0x6666666666666666666666666666666666666666666666666666666666666658",
131 : "0x08"
132 : },
133 : {
134 : /* (y^2 = x^3 + 486662*x^2 + x) */
135 : "Curve25519", 256, 0,
136 : MPI_EC_MONTGOMERY, ECC_DIALECT_STANDARD,
137 : "0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFED",
138 : "0x01DB41",
139 : "0x01",
140 : "0x1000000000000000000000000000000014DEF9DEA2F79CD65812631A5CF5D3ED",
141 : "0x0000000000000000000000000000000000000000000000000000000000000009",
142 : "0x20AE19A1B8A086B4E01EDD2C7748D14C923D4D7E6D7C61B229E9C5A27ECED3D9",
143 : "0x08"
144 : },
145 : #if 0 /* No real specs yet found. */
146 : {
147 : /* x^2 + y^2 = 1 + 3617x^2y^2 mod 2^414 - 17 */
148 : "Curve3617",
149 : "0x3FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
150 : "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEF",
151 : MPI_EC_EDWARDS, 0,
152 : "0x01",
153 : "0x0e21",
154 : "0x07FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEB3CC92414CF"
155 : "706022B36F1C0338AD63CF181B0E71A5E106AF79",
156 : "0x1A334905141443300218C0631C326E5FCD46369F44C03EC7F57FF35498A4AB4D"
157 : "6D6BA111301A73FAA8537C64C4FD3812F3CBC595",
158 : "0x22",
159 : "0x08"
160 : },
161 : #endif /*0*/
162 : {
163 : "NIST P-192", 192, 0,
164 : MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
165 : "0xfffffffffffffffffffffffffffffffeffffffffffffffff",
166 : "0xfffffffffffffffffffffffffffffffefffffffffffffffc",
167 : "0x64210519e59c80e70fa7e9ab72243049feb8deecc146b9b1",
168 : "0xffffffffffffffffffffffff99def836146bc9b1b4d22831",
169 :
170 : "0x188da80eb03090f67cbf20eb43a18800f4ff0afd82ff1012",
171 : "0x07192b95ffc8da78631011ed6b24cdd573f977a11e794811",
172 : "0x01"
173 : },
174 : {
175 : "NIST P-224", 224, 1,
176 : MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
177 : "0xffffffffffffffffffffffffffffffff000000000000000000000001",
178 : "0xfffffffffffffffffffffffffffffffefffffffffffffffffffffffe",
179 : "0xb4050a850c04b3abf54132565044b0b7d7bfd8ba270b39432355ffb4",
180 : "0xffffffffffffffffffffffffffff16a2e0b8f03e13dd29455c5c2a3d" ,
181 :
182 : "0xb70e0cbd6bb4bf7f321390b94a03c1d356c21122343280d6115c1d21",
183 : "0xbd376388b5f723fb4c22dfe6cd4375a05a07476444d5819985007e34",
184 : "0x01"
185 : },
186 : {
187 : "NIST P-256", 256, 1,
188 : MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
189 : "0xffffffff00000001000000000000000000000000ffffffffffffffffffffffff",
190 : "0xffffffff00000001000000000000000000000000fffffffffffffffffffffffc",
191 : "0x5ac635d8aa3a93e7b3ebbd55769886bc651d06b0cc53b0f63bce3c3e27d2604b",
192 : "0xffffffff00000000ffffffffffffffffbce6faada7179e84f3b9cac2fc632551",
193 :
194 : "0x6b17d1f2e12c4247f8bce6e563a440f277037d812deb33a0f4a13945d898c296",
195 : "0x4fe342e2fe1a7f9b8ee7eb4a7c0f9e162bce33576b315ececbb6406837bf51f5",
196 : "0x01"
197 : },
198 : {
199 : "NIST P-384", 384, 1,
200 : MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
201 : "0xfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe"
202 : "ffffffff0000000000000000ffffffff",
203 : "0xfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe"
204 : "ffffffff0000000000000000fffffffc",
205 : "0xb3312fa7e23ee7e4988e056be3f82d19181d9c6efe8141120314088f5013875a"
206 : "c656398d8a2ed19d2a85c8edd3ec2aef",
207 : "0xffffffffffffffffffffffffffffffffffffffffffffffffc7634d81f4372ddf"
208 : "581a0db248b0a77aecec196accc52973",
209 :
210 : "0xaa87ca22be8b05378eb1c71ef320ad746e1d3b628ba79b9859f741e082542a38"
211 : "5502f25dbf55296c3a545e3872760ab7",
212 : "0x3617de4a96262c6f5d9e98bf9292dc29f8f41dbd289a147ce9da3113b5f0b8c0"
213 : "0a60b1ce1d7e819d7a431d7c90ea0e5f",
214 : "0x01"
215 : },
216 : {
217 : "NIST P-521", 521, 1,
218 : MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
219 : "0x01ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
220 : "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
221 : "0x01ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
222 : "fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffc",
223 : "0x051953eb9618e1c9a1f929a21a0b68540eea2da725b99b315f3b8b489918ef10"
224 : "9e156193951ec7e937b1652c0bd3bb1bf073573df883d2c34f1ef451fd46b503f00",
225 : "0x1fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
226 : "ffa51868783bf2f966b7fcc0148f709a5d03bb5c9b8899c47aebb6fb71e91386409",
227 :
228 : "0x00c6858e06b70404e9cd9e3ecb662395b4429c648139053fb521f828af606b4d"
229 : "3dbaa14b5e77efe75928fe1dc127a2ffa8de3348b3c1856a429bf97e7e31c2e5bd66",
230 : "0x011839296a789a3bc0045c8a5fb42c7d1bd998f54449579b446817afbd17273e"
231 : "662c97ee72995ef42640c550b9013fad0761353c7086a272c24088be94769fd16650",
232 : "0x01"
233 : },
234 :
235 : { "brainpoolP160r1", 160, 0,
236 : MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
237 : "0xe95e4a5f737059dc60dfc7ad95b3d8139515620f",
238 : "0x340e7be2a280eb74e2be61bada745d97e8f7c300",
239 : "0x1e589a8595423412134faa2dbdec95c8d8675e58",
240 : "0xe95e4a5f737059dc60df5991d45029409e60fc09",
241 : "0xbed5af16ea3f6a4f62938c4631eb5af7bdbcdbc3",
242 : "0x1667cb477a1a8ec338f94741669c976316da6321",
243 : "0x01"
244 : },
245 :
246 : { "brainpoolP192r1", 192, 0,
247 : MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
248 : "0xc302f41d932a36cda7a3463093d18db78fce476de1a86297",
249 : "0x6a91174076b1e0e19c39c031fe8685c1cae040e5c69a28ef",
250 : "0x469a28ef7c28cca3dc721d044f4496bcca7ef4146fbf25c9",
251 : "0xc302f41d932a36cda7a3462f9e9e916b5be8f1029ac4acc1",
252 : "0xc0a0647eaab6a48753b033c56cb0f0900a2f5c4853375fd6",
253 : "0x14b690866abd5bb88b5f4828c1490002e6773fa2fa299b8f",
254 : "0x01"
255 : },
256 :
257 : { "brainpoolP224r1", 224, 0,
258 : MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
259 : "0xd7c134aa264366862a18302575d1d787b09f075797da89f57ec8c0ff",
260 : "0x68a5e62ca9ce6c1c299803a6c1530b514e182ad8b0042a59cad29f43",
261 : "0x2580f63ccfe44138870713b1a92369e33e2135d266dbb372386c400b",
262 : "0xd7c134aa264366862a18302575d0fb98d116bc4b6ddebca3a5a7939f",
263 : "0x0d9029ad2c7e5cf4340823b2a87dc68c9e4ce3174c1e6efdee12c07d",
264 : "0x58aa56f772c0726f24c6b89e4ecdac24354b9e99caa3f6d3761402cd",
265 : "0x01"
266 : },
267 :
268 : { "brainpoolP256r1", 256, 0,
269 : MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
270 : "0xa9fb57dba1eea9bc3e660a909d838d726e3bf623d52620282013481d1f6e5377",
271 : "0x7d5a0975fc2c3057eef67530417affe7fb8055c126dc5c6ce94a4b44f330b5d9",
272 : "0x26dc5c6ce94a4b44f330b5d9bbd77cbf958416295cf7e1ce6bccdc18ff8c07b6",
273 : "0xa9fb57dba1eea9bc3e660a909d838d718c397aa3b561a6f7901e0e82974856a7",
274 : "0x8bd2aeb9cb7e57cb2c4b482ffc81b7afb9de27e1e3bd23c23a4453bd9ace3262",
275 : "0x547ef835c3dac4fd97f8461a14611dc9c27745132ded8e545c1d54c72f046997",
276 : "0x01"
277 : },
278 :
279 : { "brainpoolP320r1", 320, 0,
280 : MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
281 : "0xd35e472036bc4fb7e13c785ed201e065f98fcfa6f6f40def4f92b9ec7893ec28"
282 : "fcd412b1f1b32e27",
283 : "0x3ee30b568fbab0f883ccebd46d3f3bb8a2a73513f5eb79da66190eb085ffa9f4"
284 : "92f375a97d860eb4",
285 : "0x520883949dfdbc42d3ad198640688a6fe13f41349554b49acc31dccd88453981"
286 : "6f5eb4ac8fb1f1a6",
287 : "0xd35e472036bc4fb7e13c785ed201e065f98fcfa5b68f12a32d482ec7ee8658e9"
288 : "8691555b44c59311",
289 : "0x43bd7e9afb53d8b85289bcc48ee5bfe6f20137d10a087eb6e7871e2a10a599c7"
290 : "10af8d0d39e20611",
291 : "0x14fdd05545ec1cc8ab4093247f77275e0743ffed117182eaa9c77877aaac6ac7"
292 : "d35245d1692e8ee1",
293 : "0x01"
294 : },
295 :
296 : { "brainpoolP384r1", 384, 0,
297 : MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
298 : "0x8cb91e82a3386d280f5d6f7e50e641df152f7109ed5456b412b1da197fb71123"
299 : "acd3a729901d1a71874700133107ec53",
300 : "0x7bc382c63d8c150c3c72080ace05afa0c2bea28e4fb22787139165efba91f90f"
301 : "8aa5814a503ad4eb04a8c7dd22ce2826",
302 : "0x04a8c7dd22ce28268b39b55416f0447c2fb77de107dcd2a62e880ea53eeb62d5"
303 : "7cb4390295dbc9943ab78696fa504c11",
304 : "0x8cb91e82a3386d280f5d6f7e50e641df152f7109ed5456b31f166e6cac0425a7"
305 : "cf3ab6af6b7fc3103b883202e9046565",
306 : "0x1d1c64f068cf45ffa2a63a81b7c13f6b8847a3e77ef14fe3db7fcafe0cbd10e8"
307 : "e826e03436d646aaef87b2e247d4af1e",
308 : "0x8abe1d7520f9c2a45cb1eb8e95cfd55262b70b29feec5864e19c054ff9912928"
309 : "0e4646217791811142820341263c5315",
310 : "0x01"
311 : },
312 :
313 : { "brainpoolP512r1", 512, 0,
314 : MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
315 : "0xaadd9db8dbe9c48b3fd4e6ae33c9fc07cb308db3b3c9d20ed6639cca70330871"
316 : "7d4d9b009bc66842aecda12ae6a380e62881ff2f2d82c68528aa6056583a48f3",
317 : "0x7830a3318b603b89e2327145ac234cc594cbdd8d3df91610a83441caea9863bc"
318 : "2ded5d5aa8253aa10a2ef1c98b9ac8b57f1117a72bf2c7b9e7c1ac4d77fc94ca",
319 : "0x3df91610a83441caea9863bc2ded5d5aa8253aa10a2ef1c98b9ac8b57f1117a7"
320 : "2bf2c7b9e7c1ac4d77fc94cadc083e67984050b75ebae5dd2809bd638016f723",
321 : "0xaadd9db8dbe9c48b3fd4e6ae33c9fc07cb308db3b3c9d20ed6639cca70330870"
322 : "553e5c414ca92619418661197fac10471db1d381085ddaddb58796829ca90069",
323 : "0x81aee4bdd82ed9645a21322e9c4c6a9385ed9f70b5d916c1b43b62eef4d0098e"
324 : "ff3b1f78e2d0d48d50d1687b93b97d5f7c6d5047406a5e688b352209bcb9f822",
325 : "0x7dde385d566332ecc0eabfa9cf7822fdf209f70024a57b1aa000c55b881f8111"
326 : "b2dcde494a5f485e5bca4bd88a2763aed1ca2b2fa8f0540678cd1e0f3ad80892",
327 : "0x01"
328 : },
329 : {
330 : "GOST2001-test", 256, 0,
331 : MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
332 : "0x8000000000000000000000000000000000000000000000000000000000000431",
333 : "0x0000000000000000000000000000000000000000000000000000000000000007",
334 : "0x5fbff498aa938ce739b8e022fbafef40563f6e6a3472fc2a514c0ce9dae23b7e",
335 : "0x8000000000000000000000000000000150fe8a1892976154c59cfc193accf5b3",
336 :
337 : "0x0000000000000000000000000000000000000000000000000000000000000002",
338 : "0x08e2a8a0e65147d4bd6316030e16d19c85c97f0a9ca267122b96abbcea7e8fc8",
339 : "0x01"
340 : },
341 : {
342 : "GOST2001-CryptoPro-A", 256, 0,
343 : MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
344 : "0xfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffd97",
345 : "0xfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffd94",
346 : "0x00000000000000000000000000000000000000000000000000000000000000a6",
347 : "0xffffffffffffffffffffffffffffffff6c611070995ad10045841b09b761b893",
348 : "0x0000000000000000000000000000000000000000000000000000000000000001",
349 : "0x8d91e471e0989cda27df505a453f2b7635294f2ddf23e3b122acc99c9e9f1e14",
350 : "0x01"
351 : },
352 : {
353 : "GOST2001-CryptoPro-B", 256, 0,
354 : MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
355 : "0x8000000000000000000000000000000000000000000000000000000000000c99",
356 : "0x8000000000000000000000000000000000000000000000000000000000000c96",
357 : "0x3e1af419a269a5f866a7d3c25c3df80ae979259373ff2b182f49d4ce7e1bbc8b",
358 : "0x800000000000000000000000000000015f700cfff1a624e5e497161bcc8a198f",
359 : "0x0000000000000000000000000000000000000000000000000000000000000001",
360 : "0x3fa8124359f96680b83d1c3eb2c070e5c545c9858d03ecfb744bf8d717717efc",
361 : "0x01"
362 : },
363 : {
364 : "GOST2001-CryptoPro-C", 256, 0,
365 : MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
366 : "0x9b9f605f5a858107ab1ec85e6b41c8aacf846e86789051d37998f7b9022d759b",
367 : "0x9b9f605f5a858107ab1ec85e6b41c8aacf846e86789051d37998f7b9022d7598",
368 : "0x000000000000000000000000000000000000000000000000000000000000805a",
369 : "0x9b9f605f5a858107ab1ec85e6b41c8aa582ca3511eddfb74f02f3a6598980bb9",
370 : "0x0000000000000000000000000000000000000000000000000000000000000000",
371 : "0x41ece55743711a8c3cbf3783cd08c0ee4d4dc440d4641a8f366e550dfdb3bb67",
372 : "0x01"
373 : },
374 : {
375 : "GOST2012-test", 511, 0,
376 : MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
377 : "0x4531acd1fe0023c7550d267b6b2fee80922b14b2ffb90f04d4eb7c09b5d2d15d"
378 : "f1d852741af4704a0458047e80e4546d35b8336fac224dd81664bbf528be6373",
379 : "0x0000000000000000000000000000000000000000000000000000000000000007",
380 : "0x1cff0806a31116da29d8cfa54e57eb748bc5f377e49400fdd788b649eca1ac4"
381 : "361834013b2ad7322480a89ca58e0cf74bc9e540c2add6897fad0a3084f302adc",
382 : "0x4531acd1fe0023c7550d267b6b2fee80922b14b2ffb90f04d4eb7c09b5d2d15d"
383 : "a82f2d7ecb1dbac719905c5eecc423f1d86e25edbe23c595d644aaf187e6e6df",
384 :
385 : "0x24d19cc64572ee30f396bf6ebbfd7a6c5213b3b3d7057cc825f91093a68cd762"
386 : "fd60611262cd838dc6b60aa7eee804e28bc849977fac33b4b530f1b120248a9a",
387 : "0x2bb312a43bd2ce6e0d020613c857acddcfbf061e91e5f2c3f32447c259f39b2"
388 : "c83ab156d77f1496bf7eb3351e1ee4e43dc1a18b91b24640b6dbb92cb1add371e",
389 : "0x01"
390 : },
391 : {
392 : "GOST2012-tc26-A", 512, 0,
393 : MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
394 : "0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
395 : "fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffdc7",
396 : "0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
397 : "fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffdc4",
398 : "0xe8c2505dedfc86ddc1bd0b2b6667f1da34b82574761cb0e879bd081cfd0b6265"
399 : "ee3cb090f30d27614cb4574010da90dd862ef9d4ebee4761503190785a71c760",
400 : "0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
401 : "27e69532f48d89116ff22b8d4e0560609b4b38abfad2b85dcacdb1411f10b275",
402 : "0x0000000000000000000000000000000000000000000000000000000000000000"
403 : "0000000000000000000000000000000000000000000000000000000000000003",
404 : "0x7503cfe87a836ae3a61b8816e25450e6ce5e1c93acf1abc1778064fdcbefa921"
405 : "df1626be4fd036e93d75e6a50e3a41e98028fe5fc235f5b889a589cb5215f2a4",
406 : "0x01"
407 : },
408 : {
409 : "GOST2012-tc26-B", 512, 0,
410 : MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
411 : "0x8000000000000000000000000000000000000000000000000000000000000000"
412 : "000000000000000000000000000000000000000000000000000000000000006f",
413 : "0x8000000000000000000000000000000000000000000000000000000000000000"
414 : "000000000000000000000000000000000000000000000000000000000000006c",
415 : "0x687d1b459dc841457e3e06cf6f5e2517b97c7d614af138bcbf85dc806c4b289f"
416 : "3e965d2db1416d217f8b276fad1ab69c50f78bee1fa3106efb8ccbc7c5140116",
417 : "0x8000000000000000000000000000000000000000000000000000000000000001"
418 : "49a1ec142565a545acfdb77bd9d40cfa8b996712101bea0ec6346c54374f25bd",
419 : "0x0000000000000000000000000000000000000000000000000000000000000000"
420 : "0000000000000000000000000000000000000000000000000000000000000002",
421 : "0x1a8f7eda389b094c2c071e3647a8940f3c123b697578c213be6dd9e6c8ec7335"
422 : "dcb228fd1edf4a39152cbcaaf8c0398828041055f94ceeec7e21340780fe41bd",
423 : "0x01"
424 : },
425 :
426 : {
427 : "secp256k1", 256, 0,
428 : MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
429 : "0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F",
430 : "0x0000000000000000000000000000000000000000000000000000000000000000",
431 : "0x0000000000000000000000000000000000000000000000000000000000000007",
432 : "0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141",
433 : "0x79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798",
434 : "0x483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8",
435 : "0x01"
436 : },
437 :
438 : { NULL, 0, 0, 0, 0, NULL, NULL, NULL, NULL, NULL }
439 : };
440 :
441 :
442 :
443 :
444 : /* Return a copy of POINT. */
445 : static gcry_mpi_point_t
446 0 : point_copy (gcry_mpi_point_t point)
447 : {
448 : gcry_mpi_point_t newpoint;
449 :
450 0 : if (point)
451 : {
452 0 : newpoint = mpi_point_new (0);
453 0 : point_set (newpoint, point);
454 : }
455 : else
456 0 : newpoint = NULL;
457 0 : return newpoint;
458 : }
459 :
460 :
461 : /* Helper to scan a hex string. */
462 : static gcry_mpi_t
463 0 : scanval (const char *string)
464 : {
465 : gpg_err_code_t rc;
466 : gcry_mpi_t val;
467 :
468 0 : rc = _gcry_mpi_scan (&val, GCRYMPI_FMT_HEX, string, 0, NULL);
469 0 : if (rc)
470 0 : log_fatal ("scanning ECC parameter failed: %s\n", gpg_strerror (rc));
471 0 : return val;
472 : }
473 :
474 :
475 : /* Return the index of the domain_parms table for a curve with NAME.
476 : Return -1 if not found. */
477 : static int
478 0 : find_domain_parms_idx (const char *name)
479 : {
480 : int idx, aliasno;
481 :
482 : /* First check our native curves. */
483 0 : for (idx = 0; domain_parms[idx].desc; idx++)
484 0 : if (!strcmp (name, domain_parms[idx].desc))
485 0 : return idx;
486 :
487 : /* If not found consult the alias table. */
488 0 : if (!domain_parms[idx].desc)
489 : {
490 0 : for (aliasno = 0; curve_aliases[aliasno].name; aliasno++)
491 0 : if (!strcmp (name, curve_aliases[aliasno].other))
492 0 : break;
493 0 : if (curve_aliases[aliasno].name)
494 : {
495 0 : for (idx = 0; domain_parms[idx].desc; idx++)
496 0 : if (!strcmp (curve_aliases[aliasno].name, domain_parms[idx].desc))
497 0 : return idx;
498 : }
499 : }
500 :
501 0 : return -1;
502 : }
503 :
504 :
505 : /* Generate the crypto system setup. This function takes the NAME of
506 : a curve or the desired number of bits and stores at R_CURVE the
507 : parameters of the named curve or those of a suitable curve. If
508 : R_NBITS is not NULL, the chosen number of bits is stored there.
509 : NULL may be given for R_CURVE, if the value is not required and for
510 : example only a quick test for availability is desired. Note that
511 : the curve fields should be initialized to zero because fields which
512 : are not NULL are skipped. */
513 : gpg_err_code_t
514 0 : _gcry_ecc_fill_in_curve (unsigned int nbits, const char *name,
515 : elliptic_curve_t *curve, unsigned int *r_nbits)
516 : {
517 : int idx;
518 0 : const char *resname = NULL; /* Set to a found curve name. */
519 :
520 0 : if (name)
521 0 : idx = find_domain_parms_idx (name);
522 : else
523 : {
524 0 : for (idx = 0; domain_parms[idx].desc; idx++)
525 0 : if (nbits == domain_parms[idx].nbits
526 0 : && domain_parms[idx].model == MPI_EC_WEIERSTRASS)
527 0 : break;
528 0 : if (!domain_parms[idx].desc)
529 0 : idx = -1;
530 : }
531 0 : if (idx < 0)
532 0 : return GPG_ERR_UNKNOWN_CURVE;
533 :
534 0 : resname = domain_parms[idx].desc;
535 :
536 : /* In fips mode we only support NIST curves. Note that it is
537 : possible to bypass this check by specifying the curve parameters
538 : directly. */
539 0 : if (fips_mode () && !domain_parms[idx].fips )
540 0 : return GPG_ERR_NOT_SUPPORTED;
541 :
542 0 : switch (domain_parms[idx].model)
543 : {
544 : case MPI_EC_WEIERSTRASS:
545 : case MPI_EC_EDWARDS:
546 : case MPI_EC_MONTGOMERY:
547 0 : break;
548 : default:
549 0 : return GPG_ERR_BUG;
550 : }
551 :
552 :
553 0 : if (r_nbits)
554 0 : *r_nbits = domain_parms[idx].nbits;
555 :
556 0 : if (curve)
557 : {
558 0 : curve->model = domain_parms[idx].model;
559 0 : curve->dialect = domain_parms[idx].dialect;
560 0 : if (!curve->p)
561 0 : curve->p = scanval (domain_parms[idx].p);
562 0 : if (!curve->a)
563 : {
564 0 : curve->a = scanval (domain_parms[idx].a);
565 0 : if (curve->a->sign)
566 0 : mpi_add (curve->a, curve->p, curve->a);
567 : }
568 0 : if (!curve->b)
569 : {
570 0 : curve->b = scanval (domain_parms[idx].b);
571 0 : if (curve->b->sign)
572 0 : mpi_add (curve->b, curve->p, curve->b);
573 : }
574 0 : if (!curve->n)
575 0 : curve->n = scanval (domain_parms[idx].n);
576 0 : if (!curve->h)
577 0 : curve->h = scanval (domain_parms[idx].h);
578 0 : if (!curve->G.x)
579 0 : curve->G.x = scanval (domain_parms[idx].g_x);
580 0 : if (!curve->G.y)
581 0 : curve->G.y = scanval (domain_parms[idx].g_y);
582 0 : if (!curve->G.z)
583 0 : curve->G.z = mpi_alloc_set_ui (1);
584 0 : if (!curve->name)
585 0 : curve->name = resname;
586 : }
587 :
588 0 : return 0;
589 : }
590 :
591 :
592 : /* Give the name of the curve NAME, store the curve parameters into P,
593 : A, B, G, N, and H if they point to NULL value. Note that G is returned
594 : in standard uncompressed format. Also update MODEL and DIALECT if
595 : they are not NULL. */
596 : gpg_err_code_t
597 0 : _gcry_ecc_update_curve_param (const char *name,
598 : enum gcry_mpi_ec_models *model,
599 : enum ecc_dialects *dialect,
600 : gcry_mpi_t *p, gcry_mpi_t *a, gcry_mpi_t *b,
601 : gcry_mpi_t *g, gcry_mpi_t *n, gcry_mpi_t *h)
602 : {
603 : int idx;
604 :
605 0 : idx = find_domain_parms_idx (name);
606 0 : if (idx < 0)
607 0 : return GPG_ERR_UNKNOWN_CURVE;
608 :
609 0 : if (g)
610 : {
611 : char *buf;
612 : size_t len;
613 :
614 0 : len = 4;
615 0 : len += strlen (domain_parms[idx].g_x+2);
616 0 : len += strlen (domain_parms[idx].g_y+2);
617 0 : len++;
618 0 : buf = xtrymalloc (len);
619 0 : if (!buf)
620 0 : return gpg_err_code_from_syserror ();
621 0 : strcpy (stpcpy (stpcpy (buf, "0x04"), domain_parms[idx].g_x+2),
622 0 : domain_parms[idx].g_y+2);
623 0 : _gcry_mpi_release (*g);
624 0 : *g = scanval (buf);
625 0 : xfree (buf);
626 : }
627 0 : if (model)
628 0 : *model = domain_parms[idx].model;
629 0 : if (dialect)
630 0 : *dialect = domain_parms[idx].dialect;
631 0 : if (p)
632 : {
633 0 : _gcry_mpi_release (*p);
634 0 : *p = scanval (domain_parms[idx].p);
635 : }
636 0 : if (a)
637 : {
638 0 : _gcry_mpi_release (*a);
639 0 : *a = scanval (domain_parms[idx].a);
640 : }
641 0 : if (b)
642 : {
643 0 : _gcry_mpi_release (*b);
644 0 : *b = scanval (domain_parms[idx].b);
645 : }
646 0 : if (n)
647 : {
648 0 : _gcry_mpi_release (*n);
649 0 : *n = scanval (domain_parms[idx].n);
650 : }
651 0 : if (h)
652 : {
653 0 : _gcry_mpi_release (*h);
654 0 : *h = scanval (domain_parms[idx].h);
655 : }
656 0 : return 0;
657 : }
658 :
659 :
660 : /* Return the name matching the parameters in PKEY. This works only
661 : with curves described by the Weierstrass equation. */
662 : const char *
663 0 : _gcry_ecc_get_curve (gcry_sexp_t keyparms, int iterator, unsigned int *r_nbits)
664 : {
665 : gpg_err_code_t rc;
666 0 : const char *result = NULL;
667 : elliptic_curve_t E;
668 0 : gcry_mpi_t mpi_g = NULL;
669 0 : gcry_mpi_t tmp = NULL;
670 : int idx;
671 :
672 0 : memset (&E, 0, sizeof E);
673 :
674 0 : if (r_nbits)
675 0 : *r_nbits = 0;
676 :
677 0 : if (!keyparms)
678 : {
679 0 : idx = iterator;
680 0 : if (idx >= 0 && idx < DIM (domain_parms))
681 : {
682 0 : result = domain_parms[idx].desc;
683 0 : if (r_nbits)
684 0 : *r_nbits = domain_parms[idx].nbits;
685 : }
686 0 : return result;
687 : }
688 :
689 :
690 : /*
691 : * Extract the curve parameters..
692 : */
693 0 : rc = gpg_err_code (sexp_extract_param (keyparms, NULL, "-pabgnh",
694 : &E.p, &E.a, &E.b, &mpi_g, &E.n, &E.h,
695 : NULL));
696 0 : if (rc == GPG_ERR_NO_OBJ)
697 : {
698 : /* This might be the second use case of checking whether a
699 : specific curve given by name is supported. */
700 : gcry_sexp_t l1;
701 : char *name;
702 :
703 0 : l1 = sexp_find_token (keyparms, "curve", 5);
704 0 : if (!l1)
705 0 : goto leave; /* No curve name parameter. */
706 :
707 0 : name = sexp_nth_string (l1, 1);
708 0 : sexp_release (l1);
709 0 : if (!name)
710 0 : goto leave; /* Name missing or out of core. */
711 :
712 0 : idx = find_domain_parms_idx (name);
713 0 : xfree (name);
714 0 : if (idx >= 0) /* Curve found. */
715 : {
716 0 : result = domain_parms[idx].desc;
717 0 : if (r_nbits)
718 0 : *r_nbits = domain_parms[idx].nbits;
719 : }
720 0 : return result;
721 : }
722 :
723 0 : if (rc)
724 0 : goto leave;
725 :
726 0 : if (mpi_g)
727 : {
728 0 : _gcry_mpi_point_init (&E.G);
729 0 : if (_gcry_ecc_os2ec (&E.G, mpi_g))
730 0 : goto leave;
731 : }
732 :
733 0 : for (idx = 0; domain_parms[idx].desc; idx++)
734 : {
735 0 : mpi_free (tmp);
736 0 : tmp = scanval (domain_parms[idx].p);
737 0 : if (!mpi_cmp (tmp, E.p))
738 : {
739 0 : mpi_free (tmp);
740 0 : tmp = scanval (domain_parms[idx].a);
741 0 : if (!mpi_cmp (tmp, E.a))
742 : {
743 0 : mpi_free (tmp);
744 0 : tmp = scanval (domain_parms[idx].b);
745 0 : if (!mpi_cmp (tmp, E.b))
746 : {
747 0 : mpi_free (tmp);
748 0 : tmp = scanval (domain_parms[idx].n);
749 0 : if (!mpi_cmp (tmp, E.n))
750 : {
751 0 : mpi_free (tmp);
752 0 : tmp = scanval (domain_parms[idx].h);
753 0 : if (!mpi_cmp (tmp, E.h))
754 : {
755 0 : mpi_free (tmp);
756 0 : tmp = scanval (domain_parms[idx].g_x);
757 0 : if (!mpi_cmp (tmp, E.G.x))
758 : {
759 0 : mpi_free (tmp);
760 0 : tmp = scanval (domain_parms[idx].g_y);
761 0 : if (!mpi_cmp (tmp, E.G.y))
762 : {
763 0 : result = domain_parms[idx].desc;
764 0 : if (r_nbits)
765 0 : *r_nbits = domain_parms[idx].nbits;
766 0 : goto leave;
767 : }
768 : }
769 : }
770 : }
771 : }
772 : }
773 : }
774 : }
775 :
776 : leave:
777 0 : _gcry_mpi_release (tmp);
778 0 : _gcry_mpi_release (E.p);
779 0 : _gcry_mpi_release (E.a);
780 0 : _gcry_mpi_release (E.b);
781 0 : _gcry_mpi_release (mpi_g);
782 0 : _gcry_mpi_point_free_parts (&E.G);
783 0 : _gcry_mpi_release (E.n);
784 0 : _gcry_mpi_release (E.h);
785 0 : return result;
786 : }
787 :
788 :
789 : /* Helper to extract an MPI from key parameters. */
790 : static gpg_err_code_t
791 0 : mpi_from_keyparam (gcry_mpi_t *r_a, gcry_sexp_t keyparam, const char *name)
792 : {
793 0 : gcry_err_code_t ec = 0;
794 : gcry_sexp_t l1;
795 :
796 0 : l1 = sexp_find_token (keyparam, name, 0);
797 0 : if (l1)
798 : {
799 0 : *r_a = sexp_nth_mpi (l1, 1, GCRYMPI_FMT_USG);
800 0 : sexp_release (l1);
801 0 : if (!*r_a)
802 0 : ec = GPG_ERR_INV_OBJ;
803 : }
804 0 : return ec;
805 : }
806 :
807 : /* Helper to extract a point from key parameters. If no parameter
808 : with NAME is found, the functions tries to find a non-encoded point
809 : by appending ".x", ".y" and ".z" to NAME. ".z" is in this case
810 : optional and defaults to 1. EC is the context which at this point
811 : may not be fully initialized. */
812 : static gpg_err_code_t
813 0 : point_from_keyparam (gcry_mpi_point_t *r_a,
814 : gcry_sexp_t keyparam, const char *name, mpi_ec_t ec)
815 : {
816 : gcry_err_code_t rc;
817 : gcry_sexp_t l1;
818 : gcry_mpi_point_t point;
819 :
820 0 : l1 = sexp_find_token (keyparam, name, 0);
821 0 : if (l1)
822 : {
823 : gcry_mpi_t a;
824 :
825 0 : a = sexp_nth_mpi (l1, 1, GCRYMPI_FMT_OPAQUE);
826 0 : sexp_release (l1);
827 0 : if (!a)
828 0 : return GPG_ERR_INV_OBJ;
829 :
830 0 : point = mpi_point_new (0);
831 0 : if (ec && ec->dialect == ECC_DIALECT_ED25519)
832 0 : rc = _gcry_ecc_eddsa_decodepoint (a, ec, point, NULL, NULL);
833 : else
834 0 : rc = _gcry_ecc_os2ec (point, a);
835 0 : mpi_free (a);
836 0 : if (rc)
837 : {
838 0 : mpi_point_release (point);
839 0 : return rc;
840 : }
841 : }
842 : else
843 : {
844 : char *tmpname;
845 0 : gcry_mpi_t x = NULL;
846 0 : gcry_mpi_t y = NULL;
847 0 : gcry_mpi_t z = NULL;
848 :
849 0 : tmpname = xtrymalloc (strlen (name) + 2 + 1);
850 0 : if (!tmpname)
851 0 : return gpg_err_code_from_syserror ();
852 0 : strcpy (stpcpy (tmpname, name), ".x");
853 0 : rc = mpi_from_keyparam (&x, keyparam, tmpname);
854 0 : if (rc)
855 : {
856 0 : xfree (tmpname);
857 0 : return rc;
858 : }
859 0 : strcpy (stpcpy (tmpname, name), ".y");
860 0 : rc = mpi_from_keyparam (&y, keyparam, tmpname);
861 0 : if (rc)
862 : {
863 0 : mpi_free (x);
864 0 : xfree (tmpname);
865 0 : return rc;
866 : }
867 0 : strcpy (stpcpy (tmpname, name), ".z");
868 0 : rc = mpi_from_keyparam (&z, keyparam, tmpname);
869 0 : if (rc)
870 : {
871 0 : mpi_free (y);
872 0 : mpi_free (x);
873 0 : xfree (tmpname);
874 0 : return rc;
875 : }
876 0 : if (!z)
877 0 : z = mpi_set_ui (NULL, 1);
878 0 : if (x && y)
879 0 : point = mpi_point_snatch_set (NULL, x, y, z);
880 : else
881 : {
882 0 : mpi_free (x);
883 0 : mpi_free (y);
884 0 : mpi_free (z);
885 0 : point = NULL;
886 : }
887 0 : xfree (tmpname);
888 : }
889 :
890 0 : if (point)
891 0 : *r_a = point;
892 0 : return 0;
893 : }
894 :
895 :
896 : /* This function creates a new context for elliptic curve operations.
897 : Either KEYPARAM or CURVENAME must be given. If both are given and
898 : KEYPARAM has no curve parameter, CURVENAME is used to add missing
899 : parameters. On success 0 is returned and the new context stored at
900 : R_CTX. On error NULL is stored at R_CTX and an error code is
901 : returned. The context needs to be released using
902 : gcry_ctx_release. */
903 : gpg_err_code_t
904 0 : _gcry_mpi_ec_new (gcry_ctx_t *r_ctx,
905 : gcry_sexp_t keyparam, const char *curvename)
906 : {
907 : gpg_err_code_t errc;
908 0 : gcry_ctx_t ctx = NULL;
909 0 : enum gcry_mpi_ec_models model = MPI_EC_WEIERSTRASS;
910 0 : enum ecc_dialects dialect = ECC_DIALECT_STANDARD;
911 0 : gcry_mpi_t p = NULL;
912 0 : gcry_mpi_t a = NULL;
913 0 : gcry_mpi_t b = NULL;
914 0 : gcry_mpi_point_t G = NULL;
915 0 : gcry_mpi_t n = NULL;
916 0 : gcry_mpi_t h = NULL;
917 0 : gcry_mpi_point_t Q = NULL;
918 0 : gcry_mpi_t d = NULL;
919 0 : int flags = 0;
920 : gcry_sexp_t l1;
921 :
922 0 : *r_ctx = NULL;
923 :
924 0 : if (keyparam)
925 : {
926 : /* Parse an optional flags list. */
927 0 : l1 = sexp_find_token (keyparam, "flags", 0);
928 0 : if (l1)
929 : {
930 0 : errc = _gcry_pk_util_parse_flaglist (l1, &flags, NULL);
931 0 : sexp_release (l1);
932 0 : l1 = NULL;
933 0 : if (errc)
934 0 : goto leave;
935 : }
936 :
937 : /* Check whether a curve name was given. */
938 0 : l1 = sexp_find_token (keyparam, "curve", 5);
939 :
940 : /* If we don't have a curve name or if override parameters have
941 : explicitly been requested, parse them. */
942 0 : if (!l1 || (flags & PUBKEY_FLAG_PARAM))
943 : {
944 0 : errc = mpi_from_keyparam (&p, keyparam, "p");
945 0 : if (errc)
946 0 : goto leave;
947 0 : errc = mpi_from_keyparam (&a, keyparam, "a");
948 0 : if (errc)
949 0 : goto leave;
950 0 : errc = mpi_from_keyparam (&b, keyparam, "b");
951 0 : if (errc)
952 0 : goto leave;
953 0 : errc = point_from_keyparam (&G, keyparam, "g", NULL);
954 0 : if (errc)
955 0 : goto leave;
956 0 : errc = mpi_from_keyparam (&n, keyparam, "n");
957 0 : if (errc)
958 0 : goto leave;
959 0 : errc = mpi_from_keyparam (&h, keyparam, "h");
960 0 : if (errc)
961 0 : goto leave;
962 : }
963 : }
964 : else
965 0 : l1 = NULL; /* No curvename. */
966 :
967 : /* Check whether a curve parameter is available and use that to fill
968 : in missing values. If no curve parameter is available try an
969 : optional provided curvename. If only the curvename has been
970 : given use that one. */
971 0 : if (l1 || curvename)
972 : {
973 : char *name;
974 : elliptic_curve_t *E;
975 :
976 0 : if (l1)
977 : {
978 0 : name = sexp_nth_string (l1, 1);
979 0 : sexp_release (l1);
980 0 : if (!name)
981 : {
982 0 : errc = GPG_ERR_INV_OBJ; /* Name missing or out of core. */
983 0 : goto leave;
984 : }
985 : }
986 : else
987 0 : name = NULL;
988 :
989 0 : E = xtrycalloc (1, sizeof *E);
990 0 : if (!E)
991 : {
992 0 : errc = gpg_err_code_from_syserror ();
993 0 : xfree (name);
994 0 : goto leave;
995 : }
996 :
997 0 : errc = _gcry_ecc_fill_in_curve (0, name? name : curvename, E, NULL);
998 0 : xfree (name);
999 0 : if (errc)
1000 : {
1001 0 : xfree (E);
1002 0 : goto leave;
1003 : }
1004 :
1005 0 : model = E->model;
1006 0 : dialect = E->dialect;
1007 :
1008 0 : if (!p)
1009 : {
1010 0 : p = E->p;
1011 0 : E->p = NULL;
1012 : }
1013 0 : if (!a)
1014 : {
1015 0 : a = E->a;
1016 0 : E->a = NULL;
1017 : }
1018 0 : if (!b)
1019 : {
1020 0 : b = E->b;
1021 0 : E->b = NULL;
1022 : }
1023 0 : if (!G)
1024 : {
1025 0 : G = mpi_point_snatch_set (NULL, E->G.x, E->G.y, E->G.z);
1026 0 : E->G.x = NULL;
1027 0 : E->G.y = NULL;
1028 0 : E->G.z = NULL;
1029 : }
1030 0 : if (!n)
1031 : {
1032 0 : n = E->n;
1033 0 : E->n = NULL;
1034 : }
1035 0 : if (!h)
1036 : {
1037 0 : h = E->h;
1038 0 : E->h = NULL;
1039 : }
1040 0 : _gcry_ecc_curve_free (E);
1041 0 : xfree (E);
1042 : }
1043 :
1044 :
1045 0 : errc = _gcry_mpi_ec_p_new (&ctx, model, dialect, flags, p, a, b);
1046 0 : if (!errc)
1047 : {
1048 0 : mpi_ec_t ec = _gcry_ctx_get_pointer (ctx, CONTEXT_TYPE_EC);
1049 :
1050 0 : if (b)
1051 : {
1052 0 : mpi_free (ec->b);
1053 0 : ec->b = b;
1054 0 : b = NULL;
1055 : }
1056 0 : if (G)
1057 : {
1058 0 : ec->G = G;
1059 0 : G = NULL;
1060 : }
1061 0 : if (n)
1062 : {
1063 0 : ec->n = n;
1064 0 : n = NULL;
1065 : }
1066 0 : if (h)
1067 : {
1068 0 : ec->h = h;
1069 0 : h = NULL;
1070 : }
1071 :
1072 : /* Now that we know the curve name we can look for the public key
1073 : Q. point_from_keyparam needs to know the curve parameters so
1074 : that it is able to use the correct decompression. Parsing
1075 : the private key D could have been done earlier but it is less
1076 : surprising if we do it here as well. */
1077 0 : if (keyparam)
1078 : {
1079 0 : errc = point_from_keyparam (&Q, keyparam, "q", ec);
1080 0 : if (errc)
1081 0 : goto leave;
1082 0 : errc = mpi_from_keyparam (&d, keyparam, "d");
1083 0 : if (errc)
1084 0 : goto leave;
1085 : }
1086 :
1087 0 : if (Q)
1088 : {
1089 0 : ec->Q = Q;
1090 0 : Q = NULL;
1091 : }
1092 0 : if (d)
1093 : {
1094 0 : ec->d = d;
1095 0 : d = NULL;
1096 : }
1097 :
1098 0 : *r_ctx = ctx;
1099 0 : ctx = NULL;
1100 : }
1101 :
1102 : leave:
1103 0 : _gcry_ctx_release (ctx);
1104 0 : mpi_free (p);
1105 0 : mpi_free (a);
1106 0 : mpi_free (b);
1107 0 : _gcry_mpi_point_release (G);
1108 0 : mpi_free (n);
1109 0 : mpi_free (h);
1110 0 : _gcry_mpi_point_release (Q);
1111 0 : mpi_free (d);
1112 0 : return errc;
1113 : }
1114 :
1115 :
1116 : /* Return the parameters of the curve NAME as an S-expression. */
1117 : gcry_sexp_t
1118 0 : _gcry_ecc_get_param_sexp (const char *name)
1119 : {
1120 : unsigned int nbits;
1121 : elliptic_curve_t E;
1122 : mpi_ec_t ctx;
1123 : gcry_mpi_t g_x, g_y;
1124 : gcry_mpi_t pkey[7];
1125 : gcry_sexp_t result;
1126 : int i;
1127 :
1128 0 : memset (&E, 0, sizeof E);
1129 0 : if (_gcry_ecc_fill_in_curve (0, name, &E, &nbits))
1130 0 : return NULL;
1131 :
1132 0 : g_x = mpi_new (0);
1133 0 : g_y = mpi_new (0);
1134 0 : ctx = _gcry_mpi_ec_p_internal_new (MPI_EC_WEIERSTRASS,
1135 : ECC_DIALECT_STANDARD,
1136 : 0,
1137 : E.p, E.a, NULL);
1138 0 : if (_gcry_mpi_ec_get_affine (g_x, g_y, &E.G, ctx))
1139 0 : log_fatal ("ecc get param: Failed to get affine coordinates\n");
1140 0 : _gcry_mpi_ec_free (ctx);
1141 0 : _gcry_mpi_point_free_parts (&E.G);
1142 :
1143 0 : pkey[0] = E.p;
1144 0 : pkey[1] = E.a;
1145 0 : pkey[2] = E.b;
1146 0 : pkey[3] = _gcry_ecc_ec2os (g_x, g_y, E.p);
1147 0 : pkey[4] = E.n;
1148 0 : pkey[5] = E.h;
1149 0 : pkey[6] = NULL;
1150 :
1151 0 : mpi_free (g_x);
1152 0 : mpi_free (g_y);
1153 :
1154 0 : if (sexp_build (&result, NULL,
1155 : "(public-key(ecc(p%m)(a%m)(b%m)(g%m)(n%m)(h%m)))",
1156 : pkey[0], pkey[1], pkey[2], pkey[3], pkey[4], pkey[5]))
1157 0 : result = NULL;
1158 :
1159 0 : for (i=0; pkey[i]; i++)
1160 0 : _gcry_mpi_release (pkey[i]);
1161 :
1162 0 : return result;
1163 : }
1164 :
1165 :
1166 : /* Return an MPI (or opaque MPI) described by NAME and the context EC.
1167 : If COPY is true a copy is returned, if not a const MPI may be
1168 : returned. In any case mpi_free must be used. */
1169 : gcry_mpi_t
1170 0 : _gcry_ecc_get_mpi (const char *name, mpi_ec_t ec, int copy)
1171 : {
1172 0 : if (!*name)
1173 0 : return NULL;
1174 :
1175 0 : if (!strcmp (name, "p") && ec->p)
1176 0 : return mpi_is_const (ec->p) && !copy? ec->p : mpi_copy (ec->p);
1177 0 : if (!strcmp (name, "a") && ec->a)
1178 0 : return mpi_is_const (ec->a) && !copy? ec->a : mpi_copy (ec->a);
1179 0 : if (!strcmp (name, "b") && ec->b)
1180 0 : return mpi_is_const (ec->b) && !copy? ec->b : mpi_copy (ec->b);
1181 0 : if (!strcmp (name, "n") && ec->n)
1182 0 : return mpi_is_const (ec->n) && !copy? ec->n : mpi_copy (ec->n);
1183 0 : if (!strcmp (name, "h") && ec->h)
1184 0 : return mpi_is_const (ec->h) && !copy? ec->h : mpi_copy (ec->h);
1185 0 : if (!strcmp (name, "d") && ec->d)
1186 0 : return mpi_is_const (ec->d) && !copy? ec->d : mpi_copy (ec->d);
1187 :
1188 : /* Return a requested point coordinate. */
1189 0 : if (!strcmp (name, "g.x") && ec->G && ec->G->x)
1190 0 : return mpi_is_const (ec->G->x) && !copy? ec->G->x : mpi_copy (ec->G->x);
1191 0 : if (!strcmp (name, "g.y") && ec->G && ec->G->y)
1192 0 : return mpi_is_const (ec->G->y) && !copy? ec->G->y : mpi_copy (ec->G->y);
1193 0 : if (!strcmp (name, "q.x") && ec->Q && ec->Q->x)
1194 0 : return mpi_is_const (ec->Q->x) && !copy? ec->Q->x : mpi_copy (ec->Q->x);
1195 0 : if (!strcmp (name, "q.y") && ec->Q && ec->Q->y)
1196 0 : return mpi_is_const (ec->G->y) && !copy? ec->Q->y : mpi_copy (ec->Q->y);
1197 :
1198 : /* If the base point has been requested, return it in standard
1199 : encoding. */
1200 0 : if (!strcmp (name, "g") && ec->G)
1201 0 : return _gcry_mpi_ec_ec2os (ec->G, ec);
1202 :
1203 : /* If the public key has been requested, return it by default in
1204 : standard uncompressed encoding or if requested in other
1205 : encodings. */
1206 0 : if (*name == 'q' && (!name[1] || name[1] == '@'))
1207 : {
1208 : /* If only the private key is given, compute the public key. */
1209 0 : if (!ec->Q)
1210 0 : ec->Q = _gcry_ecc_compute_public (NULL, ec, NULL, NULL);
1211 :
1212 0 : if (!ec->Q)
1213 0 : return NULL;
1214 :
1215 0 : if (name[1] != '@')
1216 0 : return _gcry_mpi_ec_ec2os (ec->Q, ec);
1217 :
1218 0 : if (!strcmp (name+2, "eddsa") && ec->model == MPI_EC_EDWARDS)
1219 : {
1220 : unsigned char *encpk;
1221 : unsigned int encpklen;
1222 :
1223 0 : if (!_gcry_ecc_eddsa_encodepoint (ec->Q, ec, NULL, NULL, 0,
1224 : &encpk, &encpklen))
1225 0 : return mpi_set_opaque (NULL, encpk, encpklen*8);
1226 : }
1227 : }
1228 :
1229 0 : return NULL;
1230 : }
1231 :
1232 :
1233 : /* Return a point described by NAME and the context EC. */
1234 : gcry_mpi_point_t
1235 0 : _gcry_ecc_get_point (const char *name, mpi_ec_t ec)
1236 : {
1237 0 : if (!strcmp (name, "g") && ec->G)
1238 0 : return point_copy (ec->G);
1239 0 : if (!strcmp (name, "q"))
1240 : {
1241 : /* If only the private key is given, compute the public key. */
1242 0 : if (!ec->Q)
1243 0 : ec->Q = _gcry_ecc_compute_public (NULL, ec, NULL, NULL);
1244 :
1245 0 : if (ec->Q)
1246 0 : return point_copy (ec->Q);
1247 : }
1248 :
1249 0 : return NULL;
1250 : }
1251 :
1252 :
1253 : /* Store the MPI NEWVALUE into the context EC under NAME. */
1254 : gpg_err_code_t
1255 0 : _gcry_ecc_set_mpi (const char *name, gcry_mpi_t newvalue, mpi_ec_t ec)
1256 : {
1257 0 : gpg_err_code_t rc = 0;
1258 :
1259 0 : if (!*name)
1260 : ;
1261 0 : else if (!strcmp (name, "p"))
1262 : {
1263 0 : mpi_free (ec->p);
1264 0 : ec->p = mpi_copy (newvalue);
1265 0 : _gcry_mpi_ec_get_reset (ec);
1266 : }
1267 0 : else if (!strcmp (name, "a"))
1268 : {
1269 0 : mpi_free (ec->a);
1270 0 : ec->a = mpi_copy (newvalue);
1271 0 : _gcry_mpi_ec_get_reset (ec);
1272 : }
1273 0 : else if (!strcmp (name, "b"))
1274 : {
1275 0 : mpi_free (ec->b);
1276 0 : ec->b = mpi_copy (newvalue);
1277 : }
1278 0 : else if (!strcmp (name, "n"))
1279 : {
1280 0 : mpi_free (ec->n);
1281 0 : ec->n = mpi_copy (newvalue);
1282 : }
1283 0 : else if (!strcmp (name, "h"))
1284 : {
1285 0 : mpi_free (ec->h);
1286 0 : ec->h = mpi_copy (newvalue);
1287 : }
1288 0 : else if (*name == 'q' && (!name[1] || name[1] == '@'))
1289 : {
1290 0 : if (newvalue)
1291 : {
1292 0 : if (!ec->Q)
1293 0 : ec->Q = mpi_point_new (0);
1294 0 : if (ec->dialect == ECC_DIALECT_ED25519)
1295 0 : rc = _gcry_ecc_eddsa_decodepoint (newvalue, ec, ec->Q, NULL, NULL);
1296 : else
1297 0 : rc = _gcry_ecc_os2ec (ec->Q, newvalue);
1298 : }
1299 0 : if (rc || !newvalue)
1300 : {
1301 0 : _gcry_mpi_point_release (ec->Q);
1302 0 : ec->Q = NULL;
1303 : }
1304 : /* Note: We assume that Q matches d and thus do not reset d. */
1305 : }
1306 0 : else if (!strcmp (name, "d"))
1307 : {
1308 0 : mpi_free (ec->d);
1309 0 : ec->d = mpi_copy (newvalue);
1310 0 : if (ec->d)
1311 : {
1312 : /* We need to reset the public key because it may not
1313 : anymore match. */
1314 0 : _gcry_mpi_point_release (ec->Q);
1315 0 : ec->Q = NULL;
1316 : }
1317 : }
1318 : else
1319 0 : rc = GPG_ERR_UNKNOWN_NAME;
1320 :
1321 0 : return rc;
1322 : }
1323 :
1324 :
1325 : /* Store the point NEWVALUE into the context EC under NAME. */
1326 : gpg_err_code_t
1327 0 : _gcry_ecc_set_point (const char *name, gcry_mpi_point_t newvalue, mpi_ec_t ec)
1328 : {
1329 0 : if (!strcmp (name, "g"))
1330 : {
1331 0 : _gcry_mpi_point_release (ec->G);
1332 0 : ec->G = point_copy (newvalue);
1333 : }
1334 0 : else if (!strcmp (name, "q"))
1335 : {
1336 0 : _gcry_mpi_point_release (ec->Q);
1337 0 : ec->Q = point_copy (newvalue);
1338 : }
1339 : else
1340 0 : return GPG_ERR_UNKNOWN_NAME;
1341 :
1342 0 : return 0;
1343 : }
|
