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-rw-r--r--comm/third_party/libgcrypt/cipher/ecc-curves.c1603
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diff --git a/comm/third_party/libgcrypt/cipher/ecc-curves.c b/comm/third_party/libgcrypt/cipher/ecc-curves.c
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+/* ecc-curves.c - Elliptic Curve parameter mangement
+ * Copyright (C) 2007, 2008, 2010, 2011 Free Software Foundation, Inc.
+ * Copyright (C) 2013 g10 Code GmbH
+ *
+ * This file is part of Libgcrypt.
+ *
+ * Libgcrypt is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * Libgcrypt is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include "g10lib.h"
+#include "mpi.h"
+#include "mpi-internal.h"
+#include "cipher.h"
+#include "context.h"
+#include "ec-context.h"
+#include "pubkey-internal.h"
+#include "ecc-common.h"
+
+
+static gpg_err_code_t
+point_from_keyparam (gcry_mpi_point_t *r_a,
+ gcry_sexp_t keyparam, const char *name, mpi_ec_t ec);
+
+/* This tables defines aliases for curve names. */
+static const struct
+{
+ const char *name; /* Our name. */
+ const char *other; /* Other name. */
+} curve_aliases[] =
+ {
+ { "Ed25519", "1.3.6.1.4.1.11591.15.1" }, /* OpenPGP */
+ { "Ed25519", "1.3.101.112" }, /* rfc8410 */
+
+ { "Curve25519", "1.3.6.1.4.1.3029.1.5.1" }, /* OpenPGP */
+ { "Curve25519", "1.3.101.110" }, /* rfc8410 */
+ { "Curve25519", "X25519" }, /* rfc8410 */
+
+ { "Ed448", "1.3.101.113" }, /* rfc8410 */
+ { "X448", "1.3.101.111" }, /* rfc8410 */
+
+ { "NIST P-192", "1.2.840.10045.3.1.1" }, /* X9.62 OID */
+ { "NIST P-192", "prime192v1" }, /* X9.62 name. */
+ { "NIST P-192", "secp192r1" }, /* SECP name. */
+ { "NIST P-192", "nistp192" }, /* rfc5656. */
+
+ { "NIST P-224", "secp224r1" },
+ { "NIST P-224", "1.3.132.0.33" }, /* SECP OID. */
+ { "NIST P-224", "nistp224" }, /* rfc5656. */
+
+ { "NIST P-256", "1.2.840.10045.3.1.7" }, /* From NIST SP 800-78-1. */
+ { "NIST P-256", "prime256v1" },
+ { "NIST P-256", "secp256r1" },
+ { "NIST P-256", "nistp256" }, /* rfc5656. */
+
+ { "NIST P-384", "secp384r1" },
+ { "NIST P-384", "1.3.132.0.34" },
+ { "NIST P-384", "nistp384" }, /* rfc5656. */
+
+ { "NIST P-521", "secp521r1" },
+ { "NIST P-521", "1.3.132.0.35" },
+ { "NIST P-521", "nistp521" }, /* rfc5656. */
+
+ { "brainpoolP160r1", "1.3.36.3.3.2.8.1.1.1" },
+ { "brainpoolP192r1", "1.3.36.3.3.2.8.1.1.3" },
+ { "brainpoolP224r1", "1.3.36.3.3.2.8.1.1.5" },
+ { "brainpoolP256r1", "1.3.36.3.3.2.8.1.1.7" },
+ { "brainpoolP320r1", "1.3.36.3.3.2.8.1.1.9" },
+ { "brainpoolP384r1", "1.3.36.3.3.2.8.1.1.11"},
+ { "brainpoolP512r1", "1.3.36.3.3.2.8.1.1.13"},
+
+ { "GOST2001-test", "1.2.643.2.2.35.0" },
+ { "GOST2001-CryptoPro-A", "1.2.643.2.2.35.1" },
+ { "GOST2001-CryptoPro-B", "1.2.643.2.2.35.2" },
+ { "GOST2001-CryptoPro-C", "1.2.643.2.2.35.3" },
+ { "GOST2001-CryptoPro-A", "GOST2001-CryptoPro-XchA" },
+ { "GOST2001-CryptoPro-C", "GOST2001-CryptoPro-XchB" },
+ { "GOST2001-CryptoPro-A", "1.2.643.2.2.36.0" },
+ { "GOST2001-CryptoPro-C", "1.2.643.2.2.36.1" },
+
+ { "GOST2012-256-tc26-A", "1.2.643.7.1.2.1.1.1" },
+ { "GOST2001-CryptoPro-A", "1.2.643.7.1.2.1.1.2" },
+ { "GOST2001-CryptoPro-A", "GOST2012-256-tc26-B" },
+ { "GOST2001-CryptoPro-B", "1.2.643.7.1.2.1.1.3" },
+ { "GOST2001-CryptoPro-B", "GOST2012-256-tc26-C" },
+ { "GOST2001-CryptoPro-C", "1.2.643.7.1.2.1.1.4" },
+ { "GOST2001-CryptoPro-C", "GOST2012-256-tc26-D" },
+
+ { "GOST2012-512-test", "GOST2012-test" },
+ { "GOST2012-512-test", "1.2.643.7.1.2.1.2.0" },
+ { "GOST2012-512-tc26-A", "GOST2012-tc26-A" },
+ { "GOST2012-512-tc26-B", "GOST2012-tc26-B" },
+ { "GOST2012-512-tc26-A", "1.2.643.7.1.2.1.2.1" },
+ { "GOST2012-512-tc26-B", "1.2.643.7.1.2.1.2.2" },
+ { "GOST2012-512-tc26-C", "1.2.643.7.1.2.1.2.3" },
+
+ { "secp256k1", "1.3.132.0.10" },
+
+ { "sm2p256v1", "1.2.156.10197.1.301" },
+
+ { NULL, NULL}
+ };
+
+
+typedef struct
+{
+ const char *desc; /* Description of the curve. */
+ unsigned int nbits; /* Number of bits. */
+ unsigned int fips:1; /* True if this is a FIPS140-2 approved curve. */
+
+ /* The model describing this curve. This is mainly used to select
+ the group equation. */
+ enum gcry_mpi_ec_models model;
+
+ /* The actual ECC dialect used. This is used for curve specific
+ optimizations and to select encodings etc. */
+ enum ecc_dialects dialect;
+
+ const char *p; /* The prime defining the field. */
+ const char *a, *b; /* The coefficients. For Twisted Edwards
+ Curves b is used for d. For Montgomery
+ Curves (a,b) has ((A-2)/4,B^-1). */
+ const char *n; /* The order of the base point. */
+ const char *g_x, *g_y; /* Base point. */
+ unsigned int h; /* Cofactor. */
+} ecc_domain_parms_t;
+
+
+/* This static table defines all available curves. */
+static const ecc_domain_parms_t domain_parms[] =
+ {
+ {
+ /* (-x^2 + y^2 = 1 + dx^2y^2) */
+ "Ed25519", 255, 0,
+ MPI_EC_EDWARDS, ECC_DIALECT_ED25519,
+ "0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFED",
+ "-0x01",
+ "-0x2DFC9311D490018C7338BF8688861767FF8FF5B2BEBE27548A14B235ECA6874A",
+ "0x1000000000000000000000000000000014DEF9DEA2F79CD65812631A5CF5D3ED",
+ "0x216936D3CD6E53FEC0A4E231FDD6DC5C692CC7609525A7B2C9562D608F25D51A",
+ "0x6666666666666666666666666666666666666666666666666666666666666658",
+ 8
+ },
+ {
+ /* (y^2 = x^3 + 486662*x^2 + x) */
+ "Curve25519", 255, 0,
+ MPI_EC_MONTGOMERY, ECC_DIALECT_STANDARD,
+ "0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFED",
+ "0x01DB41",
+ "0x01",
+ "0x1000000000000000000000000000000014DEF9DEA2F79CD65812631A5CF5D3ED",
+ "0x0000000000000000000000000000000000000000000000000000000000000009",
+ "0x20AE19A1B8A086B4E01EDD2C7748D14C923D4D7E6D7C61B229E9C5A27ECED3D9",
+ 8
+ /* Note: As per RFC-7748 errata eid4730 the g_y value should be
+ * "0x5F51E65E475F794B1FE122D388B72EB36DC2B28192839E4DD6163A5D81312C14"
+ * but that breaks the keygrip. The new value is recovered in
+ * the function _gcry_ecc_fill_in_curve. See bug #4712.
+ */
+ },
+ {
+ /* (x^2 + y^2 = 1 + dx^2y^2) */
+ "Ed448", 448, 0,
+ MPI_EC_EDWARDS, ECC_DIALECT_SAFECURVE,
+ "0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFE"
+ "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
+ "0x01",
+ "0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFE"
+ "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF6756",
+ "0x3FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
+ "7CCA23E9C44EDB49AED63690216CC2728DC58F552378C292AB5844F3",
+ "0x4F1970C66BED0DED221D15A622BF36DA9E146570470F1767EA6DE324"
+ "A3D3A46412AE1AF72AB66511433B80E18B00938E2626A82BC70CC05E",
+ "0x693F46716EB6BC248876203756C9C7624BEA73736CA3984087789C1E"
+ "05A0C2D73AD3FF1CE67C39C4FDBD132C4ED7C8AD9808795BF230FA14",
+ 4,
+ },
+ {
+ /* (y^2 = x^3 + 156326*x^2 + x) */
+ "X448", 448, 0,
+ MPI_EC_MONTGOMERY, ECC_DIALECT_SAFECURVE,
+ "0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFE"
+ "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
+ "0x98A9",
+ "0x01",
+ "0x3FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
+ "7CCA23E9C44EDB49AED63690216CC2728DC58F552378C292AB5844F3",
+ "0x00000000000000000000000000000000000000000000000000000000"
+ "00000000000000000000000000000000000000000000000000000005",
+ "0x7D235D1295F5B1F66C98AB6E58326FCECBAE5D34F55545D060F75DC2"
+ "8DF3F6EDB8027E2346430D211312C4B150677AF76FD7223D457B5B1A",
+ 4,
+ },
+#if 0 /* No real specs yet found. */
+ {
+ /* x^2 + y^2 = 1 + 3617x^2y^2 mod 2^414 - 17 */
+ "Curve3617",
+ "0x3FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"
+ "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEF",
+ MPI_EC_EDWARDS, 0,
+ "0x01",
+ "0x0e21",
+ "0x07FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEB3CC92414CF"
+ "706022B36F1C0338AD63CF181B0E71A5E106AF79",
+ "0x1A334905141443300218C0631C326E5FCD46369F44C03EC7F57FF35498A4AB4D"
+ "6D6BA111301A73FAA8537C64C4FD3812F3CBC595",
+ "0x22",
+ 8
+ },
+#endif /*0*/
+ {
+ "NIST P-192", 192, 0,
+ MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
+ "0xfffffffffffffffffffffffffffffffeffffffffffffffff",
+ "0xfffffffffffffffffffffffffffffffefffffffffffffffc",
+ "0x64210519e59c80e70fa7e9ab72243049feb8deecc146b9b1",
+ "0xffffffffffffffffffffffff99def836146bc9b1b4d22831",
+
+ "0x188da80eb03090f67cbf20eb43a18800f4ff0afd82ff1012",
+ "0x07192b95ffc8da78631011ed6b24cdd573f977a11e794811",
+ 1
+ },
+ {
+ "NIST P-224", 224, 1,
+ MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
+ "0xffffffffffffffffffffffffffffffff000000000000000000000001",
+ "0xfffffffffffffffffffffffffffffffefffffffffffffffffffffffe",
+ "0xb4050a850c04b3abf54132565044b0b7d7bfd8ba270b39432355ffb4",
+ "0xffffffffffffffffffffffffffff16a2e0b8f03e13dd29455c5c2a3d" ,
+
+ "0xb70e0cbd6bb4bf7f321390b94a03c1d356c21122343280d6115c1d21",
+ "0xbd376388b5f723fb4c22dfe6cd4375a05a07476444d5819985007e34",
+ 1
+ },
+ {
+ "NIST P-256", 256, 1,
+ MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
+ "0xffffffff00000001000000000000000000000000ffffffffffffffffffffffff",
+ "0xffffffff00000001000000000000000000000000fffffffffffffffffffffffc",
+ "0x5ac635d8aa3a93e7b3ebbd55769886bc651d06b0cc53b0f63bce3c3e27d2604b",
+ "0xffffffff00000000ffffffffffffffffbce6faada7179e84f3b9cac2fc632551",
+
+ "0x6b17d1f2e12c4247f8bce6e563a440f277037d812deb33a0f4a13945d898c296",
+ "0x4fe342e2fe1a7f9b8ee7eb4a7c0f9e162bce33576b315ececbb6406837bf51f5",
+ 1
+ },
+ {
+ "NIST P-384", 384, 1,
+ MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
+ "0xfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe"
+ "ffffffff0000000000000000ffffffff",
+ "0xfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe"
+ "ffffffff0000000000000000fffffffc",
+ "0xb3312fa7e23ee7e4988e056be3f82d19181d9c6efe8141120314088f5013875a"
+ "c656398d8a2ed19d2a85c8edd3ec2aef",
+ "0xffffffffffffffffffffffffffffffffffffffffffffffffc7634d81f4372ddf"
+ "581a0db248b0a77aecec196accc52973",
+
+ "0xaa87ca22be8b05378eb1c71ef320ad746e1d3b628ba79b9859f741e082542a38"
+ "5502f25dbf55296c3a545e3872760ab7",
+ "0x3617de4a96262c6f5d9e98bf9292dc29f8f41dbd289a147ce9da3113b5f0b8c0"
+ "0a60b1ce1d7e819d7a431d7c90ea0e5f",
+ 1
+ },
+ {
+ "NIST P-521", 521, 1,
+ MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
+ "0x01ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
+ "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
+ "0x01ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
+ "fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffc",
+ "0x051953eb9618e1c9a1f929a21a0b68540eea2da725b99b315f3b8b489918ef10"
+ "9e156193951ec7e937b1652c0bd3bb1bf073573df883d2c34f1ef451fd46b503f00",
+ "0x01ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
+ "fffa51868783bf2f966b7fcc0148f709a5d03bb5c9b8899c47aebb6fb71e91386409",
+
+ "0x00c6858e06b70404e9cd9e3ecb662395b4429c648139053fb521f828af606b4d"
+ "3dbaa14b5e77efe75928fe1dc127a2ffa8de3348b3c1856a429bf97e7e31c2e5bd66",
+ "0x011839296a789a3bc0045c8a5fb42c7d1bd998f54449579b446817afbd17273e"
+ "662c97ee72995ef42640c550b9013fad0761353c7086a272c24088be94769fd16650",
+ 1
+ },
+
+ { "brainpoolP160r1", 160, 0,
+ MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
+ "0xe95e4a5f737059dc60dfc7ad95b3d8139515620f",
+ "0x340e7be2a280eb74e2be61bada745d97e8f7c300",
+ "0x1e589a8595423412134faa2dbdec95c8d8675e58",
+ "0xe95e4a5f737059dc60df5991d45029409e60fc09",
+ "0xbed5af16ea3f6a4f62938c4631eb5af7bdbcdbc3",
+ "0x1667cb477a1a8ec338f94741669c976316da6321",
+ 1
+ },
+
+ { "brainpoolP192r1", 192, 0,
+ MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
+ "0xc302f41d932a36cda7a3463093d18db78fce476de1a86297",
+ "0x6a91174076b1e0e19c39c031fe8685c1cae040e5c69a28ef",
+ "0x469a28ef7c28cca3dc721d044f4496bcca7ef4146fbf25c9",
+ "0xc302f41d932a36cda7a3462f9e9e916b5be8f1029ac4acc1",
+ "0xc0a0647eaab6a48753b033c56cb0f0900a2f5c4853375fd6",
+ "0x14b690866abd5bb88b5f4828c1490002e6773fa2fa299b8f",
+ 1
+ },
+
+ { "brainpoolP224r1", 224, 0,
+ MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
+ "0xd7c134aa264366862a18302575d1d787b09f075797da89f57ec8c0ff",
+ "0x68a5e62ca9ce6c1c299803a6c1530b514e182ad8b0042a59cad29f43",
+ "0x2580f63ccfe44138870713b1a92369e33e2135d266dbb372386c400b",
+ "0xd7c134aa264366862a18302575d0fb98d116bc4b6ddebca3a5a7939f",
+ "0x0d9029ad2c7e5cf4340823b2a87dc68c9e4ce3174c1e6efdee12c07d",
+ "0x58aa56f772c0726f24c6b89e4ecdac24354b9e99caa3f6d3761402cd",
+ 1
+ },
+
+ { "brainpoolP256r1", 256, 0,
+ MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
+ "0xa9fb57dba1eea9bc3e660a909d838d726e3bf623d52620282013481d1f6e5377",
+ "0x7d5a0975fc2c3057eef67530417affe7fb8055c126dc5c6ce94a4b44f330b5d9",
+ "0x26dc5c6ce94a4b44f330b5d9bbd77cbf958416295cf7e1ce6bccdc18ff8c07b6",
+ "0xa9fb57dba1eea9bc3e660a909d838d718c397aa3b561a6f7901e0e82974856a7",
+ "0x8bd2aeb9cb7e57cb2c4b482ffc81b7afb9de27e1e3bd23c23a4453bd9ace3262",
+ "0x547ef835c3dac4fd97f8461a14611dc9c27745132ded8e545c1d54c72f046997",
+ 1
+ },
+
+ { "brainpoolP320r1", 320, 0,
+ MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
+ "0xd35e472036bc4fb7e13c785ed201e065f98fcfa6f6f40def4f92b9ec7893ec28"
+ "fcd412b1f1b32e27",
+ "0x3ee30b568fbab0f883ccebd46d3f3bb8a2a73513f5eb79da66190eb085ffa9f4"
+ "92f375a97d860eb4",
+ "0x520883949dfdbc42d3ad198640688a6fe13f41349554b49acc31dccd88453981"
+ "6f5eb4ac8fb1f1a6",
+ "0xd35e472036bc4fb7e13c785ed201e065f98fcfa5b68f12a32d482ec7ee8658e9"
+ "8691555b44c59311",
+ "0x43bd7e9afb53d8b85289bcc48ee5bfe6f20137d10a087eb6e7871e2a10a599c7"
+ "10af8d0d39e20611",
+ "0x14fdd05545ec1cc8ab4093247f77275e0743ffed117182eaa9c77877aaac6ac7"
+ "d35245d1692e8ee1",
+ 1
+ },
+
+ { "brainpoolP384r1", 384, 0,
+ MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
+ "0x8cb91e82a3386d280f5d6f7e50e641df152f7109ed5456b412b1da197fb71123"
+ "acd3a729901d1a71874700133107ec53",
+ "0x7bc382c63d8c150c3c72080ace05afa0c2bea28e4fb22787139165efba91f90f"
+ "8aa5814a503ad4eb04a8c7dd22ce2826",
+ "0x04a8c7dd22ce28268b39b55416f0447c2fb77de107dcd2a62e880ea53eeb62d5"
+ "7cb4390295dbc9943ab78696fa504c11",
+ "0x8cb91e82a3386d280f5d6f7e50e641df152f7109ed5456b31f166e6cac0425a7"
+ "cf3ab6af6b7fc3103b883202e9046565",
+ "0x1d1c64f068cf45ffa2a63a81b7c13f6b8847a3e77ef14fe3db7fcafe0cbd10e8"
+ "e826e03436d646aaef87b2e247d4af1e",
+ "0x8abe1d7520f9c2a45cb1eb8e95cfd55262b70b29feec5864e19c054ff9912928"
+ "0e4646217791811142820341263c5315",
+ 1
+ },
+
+ { "brainpoolP512r1", 512, 0,
+ MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
+ "0xaadd9db8dbe9c48b3fd4e6ae33c9fc07cb308db3b3c9d20ed6639cca70330871"
+ "7d4d9b009bc66842aecda12ae6a380e62881ff2f2d82c68528aa6056583a48f3",
+ "0x7830a3318b603b89e2327145ac234cc594cbdd8d3df91610a83441caea9863bc"
+ "2ded5d5aa8253aa10a2ef1c98b9ac8b57f1117a72bf2c7b9e7c1ac4d77fc94ca",
+ "0x3df91610a83441caea9863bc2ded5d5aa8253aa10a2ef1c98b9ac8b57f1117a7"
+ "2bf2c7b9e7c1ac4d77fc94cadc083e67984050b75ebae5dd2809bd638016f723",
+ "0xaadd9db8dbe9c48b3fd4e6ae33c9fc07cb308db3b3c9d20ed6639cca70330870"
+ "553e5c414ca92619418661197fac10471db1d381085ddaddb58796829ca90069",
+ "0x81aee4bdd82ed9645a21322e9c4c6a9385ed9f70b5d916c1b43b62eef4d0098e"
+ "ff3b1f78e2d0d48d50d1687b93b97d5f7c6d5047406a5e688b352209bcb9f822",
+ "0x7dde385d566332ecc0eabfa9cf7822fdf209f70024a57b1aa000c55b881f8111"
+ "b2dcde494a5f485e5bca4bd88a2763aed1ca2b2fa8f0540678cd1e0f3ad80892",
+ 1
+ },
+ {
+ "GOST2001-test", 256, 0,
+ MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
+ "0x8000000000000000000000000000000000000000000000000000000000000431",
+ "0x0000000000000000000000000000000000000000000000000000000000000007",
+ "0x5fbff498aa938ce739b8e022fbafef40563f6e6a3472fc2a514c0ce9dae23b7e",
+ "0x8000000000000000000000000000000150fe8a1892976154c59cfc193accf5b3",
+
+ "0x0000000000000000000000000000000000000000000000000000000000000002",
+ "0x08e2a8a0e65147d4bd6316030e16d19c85c97f0a9ca267122b96abbcea7e8fc8",
+ 1
+ },
+ {
+ "GOST2001-CryptoPro-A", 256, 0,
+ MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
+ "0xfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffd97",
+ "0xfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffd94",
+ "0x00000000000000000000000000000000000000000000000000000000000000a6",
+ "0xffffffffffffffffffffffffffffffff6c611070995ad10045841b09b761b893",
+ "0x0000000000000000000000000000000000000000000000000000000000000001",
+ "0x8d91e471e0989cda27df505a453f2b7635294f2ddf23e3b122acc99c9e9f1e14",
+ 1
+ },
+ {
+ "GOST2001-CryptoPro-B", 256, 0,
+ MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
+ "0x8000000000000000000000000000000000000000000000000000000000000c99",
+ "0x8000000000000000000000000000000000000000000000000000000000000c96",
+ "0x3e1af419a269a5f866a7d3c25c3df80ae979259373ff2b182f49d4ce7e1bbc8b",
+ "0x800000000000000000000000000000015f700cfff1a624e5e497161bcc8a198f",
+ "0x0000000000000000000000000000000000000000000000000000000000000001",
+ "0x3fa8124359f96680b83d1c3eb2c070e5c545c9858d03ecfb744bf8d717717efc",
+ 1
+ },
+ {
+ "GOST2001-CryptoPro-C", 256, 0,
+ MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
+ "0x9b9f605f5a858107ab1ec85e6b41c8aacf846e86789051d37998f7b9022d759b",
+ "0x9b9f605f5a858107ab1ec85e6b41c8aacf846e86789051d37998f7b9022d7598",
+ "0x000000000000000000000000000000000000000000000000000000000000805a",
+ "0x9b9f605f5a858107ab1ec85e6b41c8aa582ca3511eddfb74f02f3a6598980bb9",
+ "0x0000000000000000000000000000000000000000000000000000000000000000",
+ "0x41ece55743711a8c3cbf3783cd08c0ee4d4dc440d4641a8f366e550dfdb3bb67",
+ 1
+ },
+ {
+ "GOST2012-256-A", 256, 0,
+ MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
+ "0xfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffd97",
+ "0xc2173f1513981673af4892c23035a27ce25e2013bf95aa33b22c656f277e7335",
+ "0x295f9bae7428ed9ccc20e7c359a9d41a22fccd9108e17bf7ba9337a6f8ae9513",
+ "0x400000000000000000000000000000000fd8cddfc87b6635c115af556c360c67",
+ "0x91e38443a5e82c0d880923425712b2bb658b9196932e02c78b2582fe742daa28",
+ "0x32879423ab1a0375895786c4bb46e9565fde0b5344766740af268adb32322e5c",
+ 4
+ },
+ {
+ "GOST2012-512-test", 511, 0,
+ MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
+ "0x4531acd1fe0023c7550d267b6b2fee80922b14b2ffb90f04d4eb7c09b5d2d15d"
+ "f1d852741af4704a0458047e80e4546d35b8336fac224dd81664bbf528be6373",
+ "0x0000000000000000000000000000000000000000000000000000000000000007",
+ "0x1cff0806a31116da29d8cfa54e57eb748bc5f377e49400fdd788b649eca1ac4"
+ "361834013b2ad7322480a89ca58e0cf74bc9e540c2add6897fad0a3084f302adc",
+ "0x4531acd1fe0023c7550d267b6b2fee80922b14b2ffb90f04d4eb7c09b5d2d15d"
+ "a82f2d7ecb1dbac719905c5eecc423f1d86e25edbe23c595d644aaf187e6e6df",
+
+ "0x24d19cc64572ee30f396bf6ebbfd7a6c5213b3b3d7057cc825f91093a68cd762"
+ "fd60611262cd838dc6b60aa7eee804e28bc849977fac33b4b530f1b120248a9a",
+ "0x2bb312a43bd2ce6e0d020613c857acddcfbf061e91e5f2c3f32447c259f39b2"
+ "c83ab156d77f1496bf7eb3351e1ee4e43dc1a18b91b24640b6dbb92cb1add371e",
+ 1
+ },
+ {
+ "GOST2012-512-tc26-A", 512, 0,
+ MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
+ "0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
+ "fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffdc7",
+ "0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
+ "fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffdc4",
+ "0xe8c2505dedfc86ddc1bd0b2b6667f1da34b82574761cb0e879bd081cfd0b6265"
+ "ee3cb090f30d27614cb4574010da90dd862ef9d4ebee4761503190785a71c760",
+ "0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
+ "27e69532f48d89116ff22b8d4e0560609b4b38abfad2b85dcacdb1411f10b275",
+ "0x0000000000000000000000000000000000000000000000000000000000000000"
+ "0000000000000000000000000000000000000000000000000000000000000003",
+ "0x7503cfe87a836ae3a61b8816e25450e6ce5e1c93acf1abc1778064fdcbefa921"
+ "df1626be4fd036e93d75e6a50e3a41e98028fe5fc235f5b889a589cb5215f2a4",
+ 1
+ },
+ {
+ "GOST2012-512-tc26-B", 512, 0,
+ MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
+ "0x8000000000000000000000000000000000000000000000000000000000000000"
+ "000000000000000000000000000000000000000000000000000000000000006f",
+ "0x8000000000000000000000000000000000000000000000000000000000000000"
+ "000000000000000000000000000000000000000000000000000000000000006c",
+ "0x687d1b459dc841457e3e06cf6f5e2517b97c7d614af138bcbf85dc806c4b289f"
+ "3e965d2db1416d217f8b276fad1ab69c50f78bee1fa3106efb8ccbc7c5140116",
+ "0x8000000000000000000000000000000000000000000000000000000000000001"
+ "49a1ec142565a545acfdb77bd9d40cfa8b996712101bea0ec6346c54374f25bd",
+ "0x0000000000000000000000000000000000000000000000000000000000000000"
+ "0000000000000000000000000000000000000000000000000000000000000002",
+ "0x1a8f7eda389b094c2c071e3647a8940f3c123b697578c213be6dd9e6c8ec7335"
+ "dcb228fd1edf4a39152cbcaaf8c0398828041055f94ceeec7e21340780fe41bd",
+ 1
+ },
+ {
+ "GOST2012-512-tc26-C", 512, 0,
+ MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
+ "0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
+ "fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffdc7",
+ "0xdc9203e514a721875485a529d2c722fb187bc8980eb866644de41c68e1430645"
+ "46e861c0e2c9edd92ade71f46fcf50ff2ad97f951fda9f2a2eb6546f39689bd3",
+ "0xb4c4ee28cebc6c2c8ac12952cf37f16ac7efb6a9f69f4b57ffda2e4f0de5ade0"
+ "38cbc2fff719d2c18de0284b8bfef3b52b8cc7a5f5bf0a3c8d2319a5312557e1",
+ "0x3fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
+ "c98cdba46506ab004c33a9ff5147502cc8eda9e7a769a12694623cef47f023ed",
+ "0xe2e31edfc23de7bdebe241ce593ef5de2295b7a9cbaef021d385f7074cea043a"
+ "a27272a7ae602bf2a7b9033db9ed3610c6fb85487eae97aac5bc7928c1950148",
+ "0xf5ce40d95b5eb899abbccff5911cb8577939804d6527378b8c108c3d2090ff9be"
+ "18e2d33e3021ed2ef32d85822423b6304f726aa854bae07d0396e9a9addc40f",
+ 4
+ },
+
+ {
+ "secp256k1", 256, 0,
+ MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
+ "0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F",
+ "0x0000000000000000000000000000000000000000000000000000000000000000",
+ "0x0000000000000000000000000000000000000000000000000000000000000007",
+ "0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141",
+ "0x79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798",
+ "0x483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8",
+ 1
+ },
+
+ {
+ "sm2p256v1", 256, 0,
+ MPI_EC_WEIERSTRASS, ECC_DIALECT_STANDARD,
+ "0xfffffffeffffffffffffffffffffffffffffffff00000000ffffffffffffffff",
+ "0xfffffffeffffffffffffffffffffffffffffffff00000000fffffffffffffffc",
+ "0x28e9fa9e9d9f5e344d5a9e4bcf6509a7f39789f515ab8f92ddbcbd414d940e93",
+ "0xfffffffeffffffffffffffffffffffff7203df6b21c6052b53bbf40939d54123",
+ "0x32c4ae2c1f1981195f9904466a39c9948fe30bbff2660be1715a4589334c74c7",
+ "0xbc3736a2f4f6779c59bdcee36b692153d0a9877cc62a474002df32e52139f0a0",
+ 1
+ },
+
+ { NULL, 0, 0, 0, 0, NULL, NULL, NULL, NULL, NULL }
+ };
+
+
+
+
+/* Return a copy of POINT. */
+static gcry_mpi_point_t
+point_copy (gcry_mpi_point_t point)
+{
+ gcry_mpi_point_t newpoint;
+
+ if (point)
+ {
+ newpoint = mpi_point_new (0);
+ point_set (newpoint, point);
+ }
+ else
+ newpoint = NULL;
+ return newpoint;
+}
+
+
+/* Helper to scan a hex string. */
+static gcry_mpi_t
+scanval (const char *string)
+{
+ gpg_err_code_t rc;
+ gcry_mpi_t val;
+
+ rc = _gcry_mpi_scan (&val, GCRYMPI_FMT_HEX, string, 0, NULL);
+ if (rc)
+ log_fatal ("scanning ECC parameter failed: %s\n", gpg_strerror (rc));
+ return val;
+}
+
+
+/* Return the index of the domain_parms table for a curve with NAME.
+ Return -1 if not found. */
+static int
+find_domain_parms_idx (const char *name)
+{
+ int idx, aliasno;
+
+ /* First check our native curves. */
+ for (idx = 0; domain_parms[idx].desc; idx++)
+ if (!strcmp (name, domain_parms[idx].desc))
+ return idx;
+
+ /* If not found consult the alias table. */
+ if (!domain_parms[idx].desc)
+ {
+ for (aliasno = 0; curve_aliases[aliasno].name; aliasno++)
+ if (!strcmp (name, curve_aliases[aliasno].other))
+ break;
+ if (curve_aliases[aliasno].name)
+ {
+ for (idx = 0; domain_parms[idx].desc; idx++)
+ if (!strcmp (curve_aliases[aliasno].name, domain_parms[idx].desc))
+ return idx;
+ }
+ }
+
+ return -1;
+}
+
+
+/* Generate the crypto system setup. This function takes the NAME of
+ a curve or the desired number of bits and stores at R_CURVE the
+ parameters of the named curve or those of a suitable curve. If
+ R_NBITS is not NULL, the chosen number of bits is stored there.
+ NULL may be given for R_CURVE, if the value is not required and for
+ example only a quick test for availability is desired. Note that
+ the curve fields should be initialized to zero because fields which
+ are not NULL are skipped. */
+gpg_err_code_t
+_gcry_ecc_fill_in_curve (unsigned int nbits, const char *name,
+ elliptic_curve_t *curve, unsigned int *r_nbits)
+{
+ int idx;
+ const char *resname = NULL; /* Set to a found curve name. */
+
+ if (name)
+ idx = find_domain_parms_idx (name);
+ else
+ {
+ for (idx = 0; domain_parms[idx].desc; idx++)
+ if (nbits == domain_parms[idx].nbits
+ && domain_parms[idx].model == MPI_EC_WEIERSTRASS)
+ break;
+ if (!domain_parms[idx].desc)
+ idx = -1;
+ }
+ if (idx < 0)
+ return GPG_ERR_UNKNOWN_CURVE;
+
+ resname = domain_parms[idx].desc;
+
+ /* In fips mode we only support NIST curves. Note that it is
+ possible to bypass this check by specifying the curve parameters
+ directly. */
+ if (fips_mode () && !domain_parms[idx].fips )
+ return GPG_ERR_NOT_SUPPORTED;
+
+ switch (domain_parms[idx].model)
+ {
+ case MPI_EC_WEIERSTRASS:
+ case MPI_EC_EDWARDS:
+ case MPI_EC_MONTGOMERY:
+ break;
+ default:
+ return GPG_ERR_BUG;
+ }
+
+
+ if (r_nbits)
+ *r_nbits = domain_parms[idx].nbits;
+
+ if (curve)
+ {
+ curve->model = domain_parms[idx].model;
+ curve->dialect = domain_parms[idx].dialect;
+ if (!curve->p)
+ curve->p = scanval (domain_parms[idx].p);
+ if (!curve->a)
+ {
+ curve->a = scanval (domain_parms[idx].a);
+ if (curve->a->sign)
+ {
+ mpi_resize (curve->a, curve->p->nlimbs);
+ _gcry_mpih_sub_n (curve->a->d, curve->p->d,
+ curve->a->d, curve->p->nlimbs);
+ curve->a->nlimbs = curve->p->nlimbs;
+ curve->a->sign = 0;
+ }
+ }
+ if (!curve->b)
+ {
+ curve->b = scanval (domain_parms[idx].b);
+ if (curve->b->sign)
+ {
+ mpi_resize (curve->b, curve->p->nlimbs);
+ _gcry_mpih_sub_n (curve->b->d, curve->p->d,
+ curve->b->d, curve->p->nlimbs);
+ curve->b->nlimbs = curve->p->nlimbs;
+ curve->b->sign = 0;
+ }
+ }
+ if (!curve->n)
+ curve->n = scanval (domain_parms[idx].n);
+ if (!curve->G.x)
+ curve->G.x = scanval (domain_parms[idx].g_x);
+ if (!curve->G.y)
+ curve->G.y = scanval (domain_parms[idx].g_y);
+ curve->h = domain_parms[idx].h;
+
+ /*
+ * In the constants of domain_parms, we defined Curve25519
+ * domain parameters as the ones in RFC-7748 before the errata
+ * (eid4730). To keep the computation having exact same values,
+ * we recover the new value of g_y, here.
+ */
+ if (!strcmp (resname, "Curve25519"))
+ mpi_sub (curve->G.y, curve->p, curve->G.y);
+
+ if (!curve->G.z)
+ curve->G.z = mpi_alloc_set_ui (1);
+ if (!curve->name)
+ curve->name = resname;
+ }
+
+ return 0;
+}
+
+
+/* Give the name of the curve NAME, store the curve parameters into P,
+ A, B, G, and N if they point to NULL value. Note that G is
+ returned in standard uncompressed format. Also update MODEL and
+ DIALECT if they are not NULL. */
+gpg_err_code_t
+_gcry_ecc_update_curve_param (const char *name,
+ enum gcry_mpi_ec_models *model,
+ enum ecc_dialects *dialect,
+ gcry_mpi_t *p, gcry_mpi_t *a, gcry_mpi_t *b,
+ gcry_mpi_t *g, gcry_mpi_t *n)
+{
+ int idx;
+
+ idx = find_domain_parms_idx (name);
+ if (idx < 0)
+ return GPG_ERR_UNKNOWN_CURVE;
+
+ if (g)
+ {
+ char *buf;
+ size_t len;
+
+ len = 4;
+ len += strlen (domain_parms[idx].g_x+2);
+ len += strlen (domain_parms[idx].g_y+2);
+ len++;
+ buf = xtrymalloc (len);
+ if (!buf)
+ return gpg_err_code_from_syserror ();
+ strcpy (stpcpy (stpcpy (buf, "0x04"), domain_parms[idx].g_x+2),
+ domain_parms[idx].g_y+2);
+ _gcry_mpi_release (*g);
+ *g = scanval (buf);
+ xfree (buf);
+ }
+ if (model)
+ *model = domain_parms[idx].model;
+ if (dialect)
+ *dialect = domain_parms[idx].dialect;
+ if (p)
+ {
+ _gcry_mpi_release (*p);
+ *p = scanval (domain_parms[idx].p);
+ }
+ if (a)
+ {
+ _gcry_mpi_release (*a);
+ *a = scanval (domain_parms[idx].a);
+ }
+ if (b)
+ {
+ _gcry_mpi_release (*b);
+ *b = scanval (domain_parms[idx].b);
+ }
+ if (n)
+ {
+ _gcry_mpi_release (*n);
+ *n = scanval (domain_parms[idx].n);
+ }
+ return 0;
+}
+
+
+/* Return the name matching the parameters in PKEY. This works only
+ with curves described by the Weierstrass equation. */
+const char *
+_gcry_ecc_get_curve (gcry_sexp_t keyparms, int iterator, unsigned int *r_nbits)
+{
+ gpg_err_code_t rc;
+ const char *result = NULL;
+ elliptic_curve_t E;
+ gcry_mpi_point_t G = NULL;
+ gcry_mpi_t tmp = NULL;
+ int idx;
+
+ memset (&E, 0, sizeof E);
+
+ if (r_nbits)
+ *r_nbits = 0;
+
+ if (!keyparms)
+ {
+ idx = iterator;
+ if (idx >= 0 && idx < DIM (domain_parms))
+ {
+ result = domain_parms[idx].desc;
+ if (r_nbits)
+ *r_nbits = domain_parms[idx].nbits;
+ }
+ return result;
+ }
+
+
+ /*
+ * Extract the curve parameters..
+ */
+ rc = gpg_err_code (sexp_extract_param (keyparms, NULL, "pabn",
+ &E.p, &E.a, &E.b, &E.n, NULL));
+ if (rc == GPG_ERR_NO_OBJ)
+ {
+ /* This might be the second use case of checking whether a
+ specific curve given by name is supported. */
+ gcry_sexp_t l1;
+ char *name;
+
+ l1 = sexp_find_token (keyparms, "curve", 5);
+ if (!l1)
+ goto leave; /* No curve name parameter. */
+
+ name = sexp_nth_string (l1, 1);
+ sexp_release (l1);
+ if (!name)
+ goto leave; /* Name missing or out of core. */
+
+ idx = find_domain_parms_idx (name);
+ xfree (name);
+ if (idx >= 0) /* Curve found. */
+ {
+ result = domain_parms[idx].desc;
+ if (r_nbits)
+ *r_nbits = domain_parms[idx].nbits;
+ }
+ return result;
+ }
+
+ if (rc)
+ goto leave;
+
+ rc = point_from_keyparam (&G, keyparms, "g", NULL);
+ if (rc)
+ goto leave;
+
+ _gcry_mpi_point_init (&E.G);
+ _gcry_mpi_point_set (&E.G, G->x, G->y, G->z);
+
+ for (idx = 0; domain_parms[idx].desc; idx++)
+ {
+ mpi_free (tmp);
+ tmp = scanval (domain_parms[idx].p);
+ if (mpi_cmp (tmp, E.p))
+ continue;
+
+ mpi_free (tmp);
+ tmp = scanval (domain_parms[idx].a);
+ if (tmp->sign)
+ {
+ if (!mpi_cmpabs (tmp, E.a))
+ /* For backward compatibility to <= libgcrypt 1.8, we
+ allow this match to support existing keys in SEXP. */
+ ;
+ else
+ {
+ mpi_resize (tmp, E.p->nlimbs);
+ _gcry_mpih_sub_n (tmp->d, E.p->d,
+ tmp->d, E.p->nlimbs);
+ tmp->nlimbs = E.p->nlimbs;
+ tmp->sign = 0;
+ if (mpi_cmp (tmp, E.a))
+ continue;
+ }
+ }
+ else if (mpi_cmp (tmp, E.a))
+ continue;
+
+ mpi_free (tmp);
+ tmp = scanval (domain_parms[idx].b);
+ if (tmp->sign)
+ {
+ if (!mpi_cmpabs (tmp, E.b))
+ /* Same for backward compatibility, see above. */
+ ;
+ else
+ {
+ mpi_resize (tmp, E.p->nlimbs);
+ _gcry_mpih_sub_n (tmp->d, E.p->d,
+ tmp->d, E.p->nlimbs);
+ tmp->nlimbs = E.p->nlimbs;
+ tmp->sign = 0;
+ if (mpi_cmp (tmp, E.b))
+ continue;
+ }
+ }
+ else if (mpi_cmp (tmp, E.b))
+ continue;
+
+ mpi_free (tmp);
+ tmp = scanval (domain_parms[idx].n);
+ if (mpi_cmp (tmp, E.n))
+ continue;
+
+ mpi_free (tmp);
+ tmp = scanval (domain_parms[idx].g_x);
+ if (mpi_cmp (tmp, E.G.x))
+ continue;
+
+ mpi_free (tmp);
+ tmp = scanval (domain_parms[idx].g_y);
+ if (mpi_cmp (tmp, E.G.y))
+ continue;
+
+ result = domain_parms[idx].desc;
+ if (r_nbits)
+ *r_nbits = domain_parms[idx].nbits;
+ break;
+ }
+
+ leave:
+ _gcry_mpi_point_release (G);
+ _gcry_mpi_release (tmp);
+ _gcry_mpi_release (E.p);
+ _gcry_mpi_release (E.a);
+ _gcry_mpi_release (E.b);
+ _gcry_mpi_point_free_parts (&E.G);
+ _gcry_mpi_release (E.n);
+ return result;
+}
+
+
+/* Helper to extract an MPI from key parameters. */
+static gpg_err_code_t
+mpi_from_keyparam (gcry_mpi_t *r_a, gcry_sexp_t keyparam, const char *name,
+ int opaque)
+{
+ gcry_err_code_t ec = 0;
+ gcry_sexp_t l1;
+
+ l1 = sexp_find_token (keyparam, name, 0);
+ if (l1)
+ {
+ *r_a = sexp_nth_mpi (l1, 1, opaque? GCRYMPI_FMT_OPAQUE : GCRYMPI_FMT_USG);
+ sexp_release (l1);
+ if (!*r_a)
+ ec = GPG_ERR_INV_OBJ;
+ }
+ return ec;
+}
+
+/* Helper to extract a point from key parameters. If no parameter
+ with NAME is found, the functions tries to find a non-encoded point
+ by appending ".x", ".y" and ".z" to NAME. ".z" is in this case
+ optional and defaults to 1. EC is the context which at this point
+ may not be fully initialized. */
+static gpg_err_code_t
+point_from_keyparam (gcry_mpi_point_t *r_a,
+ gcry_sexp_t keyparam, const char *name, mpi_ec_t ec)
+{
+ gcry_err_code_t rc;
+ gcry_sexp_t l1;
+ gcry_mpi_point_t point;
+
+ l1 = sexp_find_token (keyparam, name, 0);
+ if (l1)
+ {
+ gcry_mpi_t a;
+
+ a = sexp_nth_mpi (l1, 1, GCRYMPI_FMT_OPAQUE);
+ sexp_release (l1);
+ if (!a)
+ return GPG_ERR_INV_OBJ;
+
+ point = mpi_point_new (0);
+ rc = _gcry_mpi_ec_decode_point (point, a, ec);
+ mpi_free (a);
+ if (rc)
+ {
+ mpi_point_release (point);
+ return rc;
+ }
+ }
+ else
+ {
+ char *tmpname;
+ gcry_mpi_t x = NULL;
+ gcry_mpi_t y = NULL;
+ gcry_mpi_t z = NULL;
+
+ tmpname = xtrymalloc (strlen (name) + 2 + 1);
+ if (!tmpname)
+ return gpg_err_code_from_syserror ();
+ strcpy (stpcpy (tmpname, name), ".x");
+ rc = mpi_from_keyparam (&x, keyparam, tmpname, 0);
+ if (rc)
+ {
+ xfree (tmpname);
+ return rc;
+ }
+ strcpy (stpcpy (tmpname, name), ".y");
+ rc = mpi_from_keyparam (&y, keyparam, tmpname, 0);
+ if (rc)
+ {
+ mpi_free (x);
+ xfree (tmpname);
+ return rc;
+ }
+ strcpy (stpcpy (tmpname, name), ".z");
+ rc = mpi_from_keyparam (&z, keyparam, tmpname, 0);
+ if (rc)
+ {
+ mpi_free (y);
+ mpi_free (x);
+ xfree (tmpname);
+ return rc;
+ }
+ if (!z)
+ z = mpi_set_ui (NULL, 1);
+ if (x && y)
+ point = mpi_point_snatch_set (NULL, x, y, z);
+ else
+ {
+ mpi_free (x);
+ mpi_free (y);
+ mpi_free (z);
+ point = NULL;
+ }
+ xfree (tmpname);
+ }
+
+ if (point)
+ *r_a = point;
+ return 0;
+}
+
+
+
+static gpg_err_code_t
+mpi_ec_get_elliptic_curve (elliptic_curve_t *E, int *r_flags,
+ gcry_sexp_t keyparam, const char *curvename)
+{
+ gpg_err_code_t errc;
+ unsigned int nbits;
+ gcry_sexp_t l1;
+
+ errc = _gcry_pk_util_get_nbits (keyparam, &nbits);
+ if (errc)
+ return errc;
+
+ E->model = MPI_EC_WEIERSTRASS;
+ E->dialect = ECC_DIALECT_STANDARD;
+ E->h = 1;
+
+ if (keyparam)
+ {
+ /* Parse an optional flags list. */
+ l1 = sexp_find_token (keyparam, "flags", 0);
+ if (l1)
+ {
+ int flags = 0;
+
+ errc = _gcry_pk_util_parse_flaglist (l1, &flags, NULL);
+ sexp_release (l1);
+ l1 = NULL;
+ if (errc)
+ goto leave;
+
+ *r_flags |= flags;
+ }
+
+ /* Parse the deprecated optional transient-key flag. */
+ l1 = sexp_find_token (keyparam, "transient-key", 0);
+ if (l1)
+ {
+ *r_flags |= PUBKEY_FLAG_TRANSIENT_KEY;
+ sexp_release (l1);
+ }
+
+ /* Check whether a curve name was given. */
+ l1 = sexp_find_token (keyparam, "curve", 5);
+
+ /* If we don't have a curve name or if override parameters have
+ explicitly been requested, parse them. */
+ if (!l1 || (*r_flags & PUBKEY_FLAG_PARAM))
+ {
+ gcry_mpi_point_t G = NULL;
+ gcry_mpi_t cofactor = NULL;
+
+ errc = mpi_from_keyparam (&E->p, keyparam, "p", 0);
+ if (errc)
+ goto leave;
+ errc = mpi_from_keyparam (&E->a, keyparam, "a", 0);
+ if (errc)
+ goto leave;
+ errc = mpi_from_keyparam (&E->b, keyparam, "b", 0);
+ if (errc)
+ goto leave;
+ errc = point_from_keyparam (&G, keyparam, "g", NULL);
+ if (errc)
+ goto leave;
+ if (G)
+ {
+ _gcry_mpi_point_init (&E->G);
+ mpi_point_set (&E->G, G->x, G->y, G->z);
+ mpi_point_set (G, NULL, NULL, NULL);
+ mpi_point_release (G);
+ }
+ errc = mpi_from_keyparam (&E->n, keyparam, "n", 0);
+ if (errc)
+ goto leave;
+ errc = mpi_from_keyparam (&cofactor, keyparam, "h", 0);
+ if (errc)
+ goto leave;
+ if (cofactor)
+ {
+ mpi_get_ui (&E->h, cofactor);
+ mpi_free (cofactor);
+ }
+ }
+ }
+ else
+ l1 = NULL; /* No curvename. */
+
+ /* Check whether a curve parameter is available and use that to fill
+ in missing values. If no curve parameter is available try an
+ optional provided curvename. If only the curvename has been
+ given use that one. */
+ if (l1 || curvename || nbits)
+ {
+ char *name;
+
+ if (l1)
+ {
+ name = sexp_nth_string (l1, 1);
+ sexp_release (l1);
+ if (!name)
+ {
+ errc = GPG_ERR_INV_OBJ; /* Name missing or out of core. */
+ goto leave;
+ }
+ }
+ else
+ name = NULL;
+
+ errc = _gcry_ecc_fill_in_curve (nbits, name? name : curvename, E, NULL);
+ xfree (name);
+ if (errc)
+ goto leave;
+ }
+
+ leave:
+ return errc;
+}
+
+static gpg_err_code_t
+mpi_ec_setup_elliptic_curve (mpi_ec_t ec, int flags,
+ elliptic_curve_t *E, gcry_sexp_t keyparam)
+{
+ gpg_err_code_t errc = 0;
+
+ ec->G = mpi_point_snatch_set (NULL, E->G.x, E->G.y, E->G.z);
+ E->G.x = NULL;
+ E->G.y = NULL;
+ E->G.z = NULL;
+ ec->n = E->n;
+ E->n = NULL;
+ ec->h = E->h;
+ ec->name = E->name;
+
+ /* Now that we know the curve name we can look for the public key
+ Q. point_from_keyparam needs to know the curve parameters so
+ that it is able to use the correct decompression. Parsing
+ the private key D could have been done earlier but it is less
+ surprising if we do it here as well. */
+ if (keyparam)
+ {
+ int is_opaque_bytes = ((ec->dialect == ECC_DIALECT_ED25519
+ && (flags & PUBKEY_FLAG_EDDSA))
+ || (ec->dialect == ECC_DIALECT_SAFECURVE));
+
+ errc = point_from_keyparam (&ec->Q, keyparam, "q", ec);
+ if (errc)
+ return errc;
+ errc = mpi_from_keyparam (&ec->d, keyparam, "d", is_opaque_bytes);
+
+ /* Size of opaque bytes should match size of P. */
+ if (!errc && ec->d && is_opaque_bytes)
+ {
+ unsigned int n = mpi_get_nbits (ec->d);
+ unsigned int len;
+
+ len = (ec->nbits+7)/8;
+ /* EdDSA requires additional bit for sign. */
+ if ((ec->nbits%8) == 0 && ec->model == MPI_EC_EDWARDS)
+ len++;
+
+ if ((n+7)/8 != len)
+ {
+ if (ec->dialect == ECC_DIALECT_ED25519)
+ {
+ /*
+ * GnuPG (<= 2.2) or OpenPGP implementations with no
+ * SOS support may remove zeros at the beginning.
+ * Recover those zeros.
+ */
+ /*
+ * Also, GnuPG (<= 2.2) may add additional zero at
+ * the beginning, when private key is moved from
+ * OpenPGP to gpg-agent. Remove such a zero-prefix.
+ */
+ const unsigned char *buf;
+ unsigned char *value;
+
+ buf = mpi_get_opaque (ec->d, &n);
+ if (!buf)
+ return GPG_ERR_INV_OBJ;
+
+ value = xtrymalloc_secure (len);
+ if (!value)
+ return gpg_err_code_from_syserror ();
+
+ if ((n+7)/8 < len)
+ /* Recover zeros. */
+ {
+ memset (value, 0, len - (n+7)/8);
+ memcpy (value + len - (n+7)/8, buf, (n+7)/8);
+ }
+ else if ((n+7)/8 == len + 1)
+ /* Remove a zero. */
+ memcpy (value, buf+1, len);
+ else
+ {
+ xfree (value);
+ return GPG_ERR_INV_OBJ;
+ }
+
+ mpi_set_opaque (ec->d, value, len*8);
+ }
+ else
+ {
+ if (DBG_CIPHER)
+ log_debug ("scalar size (%d) != prime size (%d)",
+ (n+7)/8, len);
+
+ errc = GPG_ERR_INV_OBJ;
+ }
+ }
+ }
+ }
+
+ return errc;
+}
+
+gpg_err_code_t
+_gcry_mpi_ec_internal_new (mpi_ec_t *r_ec, int *r_flags, const char *name_op,
+ gcry_sexp_t keyparam, const char *curvename)
+{
+ gpg_err_code_t errc;
+ elliptic_curve_t E;
+ mpi_ec_t ec;
+
+ *r_ec = NULL;
+
+ memset (&E, 0, sizeof E);
+ errc = mpi_ec_get_elliptic_curve (&E, r_flags, keyparam, curvename);
+ if (errc)
+ goto leave;
+
+ ec = _gcry_mpi_ec_p_internal_new (E.model, E.dialect, *r_flags,
+ E.p, E.a, E.b);
+ if (!ec)
+ goto leave;
+
+ errc = mpi_ec_setup_elliptic_curve (ec, *r_flags, &E, keyparam);
+ if (errc)
+ {
+ _gcry_mpi_ec_free (ec);
+ goto leave;
+ }
+ else
+ *r_ec = ec;
+
+ if (!errc && DBG_CIPHER)
+ {
+ gcry_mpi_t mpi_q = NULL;
+ gcry_sexp_t l1;
+ char msg[80];
+
+ l1 = sexp_find_token (keyparam, "q", 0);
+ if (l1)
+ {
+ mpi_q = sexp_nth_mpi (l1, 1, GCRYMPI_FMT_OPAQUE);
+ sexp_release (l1);
+ }
+
+ log_debug ("%s info: %s/%s%s\n", name_op,
+ _gcry_ecc_model2str (ec->model),
+ _gcry_ecc_dialect2str (ec->dialect),
+ (*r_flags & PUBKEY_FLAG_EDDSA)? "+EdDSA" : "");
+ if (ec->name)
+ log_debug ("%s name: %s\n", name_op, ec->name);
+ snprintf (msg, sizeof msg, "%s p", name_op);
+ log_printmpi (msg, ec->p);
+ snprintf (msg, sizeof msg, "%s a", name_op);
+ log_printmpi (msg, ec->a);
+ snprintf (msg, sizeof msg, "%s b", name_op);
+ log_printmpi (msg, ec->b);
+ snprintf (msg, sizeof msg, "%s g", name_op);
+ log_printpnt (msg, ec->G, NULL);
+ snprintf (msg, sizeof msg, "%s n", name_op);
+ log_printmpi (msg, ec->n);
+ log_debug ("%s h:+%02x\n", name_op, ec->h);
+ if (mpi_q)
+ {
+ snprintf (msg, sizeof msg, "%s q", name_op);
+ log_printmpi (msg, mpi_q);
+ mpi_free (mpi_q);
+ }
+ if (!fips_mode () && ec->d)
+ {
+ snprintf (msg, sizeof msg, "%s d", name_op);
+ log_printmpi (msg, ec->d);
+ }
+ }
+
+ leave:
+ _gcry_ecc_curve_free (&E);
+ return errc;
+}
+
+/* This function creates a new context for elliptic curve operations.
+ Either KEYPARAM or CURVENAME must be given. If both are given and
+ KEYPARAM has no curve parameter, CURVENAME is used to add missing
+ parameters. On success 0 is returned and the new context stored at
+ R_CTX. On error NULL is stored at R_CTX and an error code is
+ returned. The context needs to be released using
+ gcry_ctx_release. */
+gpg_err_code_t
+_gcry_mpi_ec_new (gcry_ctx_t *r_ctx,
+ gcry_sexp_t keyparam, const char *curvename)
+{
+ gpg_err_code_t errc;
+ elliptic_curve_t E;
+ gcry_ctx_t ctx = NULL;
+ int flags = 0;
+ mpi_ec_t ec;
+
+ *r_ctx = NULL;
+
+ memset (&E, 0, sizeof E);
+ errc = mpi_ec_get_elliptic_curve (&E, &flags, keyparam, curvename);
+ if (errc)
+ goto leave;
+
+ errc = _gcry_mpi_ec_p_new (&ctx, E.model, E.dialect, flags, E.p, E.a, E.b);
+ if (errc)
+ goto leave;
+
+ ec = _gcry_ctx_get_pointer (ctx, CONTEXT_TYPE_EC);
+ errc = mpi_ec_setup_elliptic_curve (ec, flags, &E, keyparam);
+ if (errc)
+ goto leave;
+
+ *r_ctx = ctx;
+ ctx = NULL;
+
+ leave:
+ _gcry_ecc_curve_free (&E);
+ _gcry_ctx_release (ctx);
+ return errc;
+}
+
+
+/* Return the parameters of the curve NAME as an S-expression. */
+gcry_sexp_t
+_gcry_ecc_get_param_sexp (const char *name)
+{
+ unsigned int nbits;
+ elliptic_curve_t E;
+ mpi_ec_t ctx;
+ gcry_mpi_t g_x, g_y;
+ gcry_mpi_t pkey[5];
+ gcry_sexp_t result;
+ int i;
+
+ memset (&E, 0, sizeof E);
+ if (_gcry_ecc_fill_in_curve (0, name, &E, &nbits))
+ return NULL;
+
+ g_x = mpi_new (0);
+ g_y = mpi_new (0);
+ ctx = _gcry_mpi_ec_p_internal_new (E.model,
+ E.dialect,
+ 0,
+ E.p, E.a, E.b);
+ if (_gcry_mpi_ec_get_affine (g_x, g_y, &E.G, ctx))
+ log_fatal ("ecc get param: Failed to get affine coordinates\n");
+ _gcry_mpi_ec_free (ctx);
+ _gcry_mpi_point_free_parts (&E.G);
+
+ pkey[0] = E.p;
+ pkey[1] = E.a;
+ pkey[2] = E.b;
+ pkey[3] = _gcry_ecc_ec2os (g_x, g_y, E.p);
+ pkey[4] = E.n;
+
+ mpi_free (g_x);
+ mpi_free (g_y);
+
+ if (sexp_build (&result, NULL,
+ "(public-key(ecc(p%m)(a%m)(b%m)(g%m)(n%m)(h%u)))",
+ pkey[0], pkey[1], pkey[2], pkey[3], pkey[4], E.h))
+ result = NULL;
+
+ for (i=0; i < DIM (pkey); i++)
+ _gcry_mpi_release (pkey[i]);
+
+ return result;
+}
+
+
+/* Return an MPI (or opaque MPI) described by NAME and the context EC.
+ If COPY is true a copy is returned, if not a const MPI may be
+ returned. In any case mpi_free must be used. */
+gcry_mpi_t
+_gcry_ecc_get_mpi (const char *name, mpi_ec_t ec, int copy)
+{
+ if (!*name)
+ return NULL;
+
+ if (!strcmp (name, "p") && ec->p)
+ return mpi_is_const (ec->p) && !copy? ec->p : mpi_copy (ec->p);
+ if (!strcmp (name, "a") && ec->a)
+ return mpi_is_const (ec->a) && !copy? ec->a : mpi_copy (ec->a);
+ if (!strcmp (name, "b") && ec->b)
+ return mpi_is_const (ec->b) && !copy? ec->b : mpi_copy (ec->b);
+ if (!strcmp (name, "n") && ec->n)
+ return mpi_is_const (ec->n) && !copy? ec->n : mpi_copy (ec->n);
+ if (!strcmp (name, "h"))
+ {
+ gcry_mpi_t h = _gcry_mpi_get_const (ec->h);
+
+ return !copy? h : mpi_set (NULL, h);
+ }
+ if (!strcmp (name, "d") && ec->d)
+ return mpi_is_const (ec->d) && !copy? ec->d : mpi_copy (ec->d);
+
+ /* Return a requested point coordinate. */
+ if (!strcmp (name, "g.x") && ec->G && ec->G->x)
+ return mpi_is_const (ec->G->x) && !copy? ec->G->x : mpi_copy (ec->G->x);
+ if (!strcmp (name, "g.y") && ec->G && ec->G->y)
+ return mpi_is_const (ec->G->y) && !copy? ec->G->y : mpi_copy (ec->G->y);
+ if (!strcmp (name, "q.x") && ec->Q && ec->Q->x)
+ return mpi_is_const (ec->Q->x) && !copy? ec->Q->x : mpi_copy (ec->Q->x);
+ if (!strcmp (name, "q.y") && ec->Q && ec->Q->y)
+ return mpi_is_const (ec->Q->y) && !copy? ec->Q->y : mpi_copy (ec->Q->y);
+
+ /* If the base point has been requested, return it in standard
+ encoding. */
+ if (!strcmp (name, "g") && ec->G)
+ return _gcry_mpi_ec_ec2os (ec->G, ec);
+
+ /* If the public key has been requested, return it by default in
+ standard uncompressed encoding or if requested in other
+ encodings. */
+ if (*name == 'q' && (!name[1] || name[1] == '@'))
+ {
+ /* If only the private key is given, compute the public key. */
+ if (!ec->Q)
+ ec->Q = _gcry_ecc_compute_public (NULL, ec);
+
+ if (!ec->Q)
+ return NULL;
+
+ if (name[1] != '@')
+ return _gcry_mpi_ec_ec2os (ec->Q, ec);
+
+ if (!strcmp (name+2, "eddsa") && ec->model == MPI_EC_EDWARDS)
+ {
+ unsigned char *encpk;
+ unsigned int encpklen;
+
+ if (!_gcry_ecc_eddsa_encodepoint (ec->Q, ec, NULL, NULL, 0,
+ &encpk, &encpklen))
+ return mpi_set_opaque (NULL, encpk, encpklen*8);
+ }
+ }
+
+ return NULL;
+}
+
+
+/* Return a point described by NAME and the context EC. */
+gcry_mpi_point_t
+_gcry_ecc_get_point (const char *name, mpi_ec_t ec)
+{
+ if (!strcmp (name, "g") && ec->G)
+ return point_copy (ec->G);
+ if (!strcmp (name, "q"))
+ {
+ /* If only the private key is given, compute the public key. */
+ if (!ec->Q)
+ ec->Q = _gcry_ecc_compute_public (NULL, ec);
+
+ if (ec->Q)
+ return point_copy (ec->Q);
+ }
+
+ return NULL;
+}
+
+
+/* Store the MPI NEWVALUE into the context EC under NAME. */
+gpg_err_code_t
+_gcry_ecc_set_mpi (const char *name, gcry_mpi_t newvalue, mpi_ec_t ec)
+{
+ gpg_err_code_t rc = 0;
+
+ if (!*name)
+ ;
+ else if (!strcmp (name, "p"))
+ {
+ mpi_free (ec->p);
+ ec->p = mpi_copy (newvalue);
+ _gcry_mpi_ec_get_reset (ec);
+ }
+ else if (!strcmp (name, "a"))
+ {
+ mpi_free (ec->a);
+ ec->a = mpi_copy (newvalue);
+ _gcry_mpi_ec_get_reset (ec);
+ }
+ else if (!strcmp (name, "b"))
+ {
+ mpi_free (ec->b);
+ ec->b = mpi_copy (newvalue);
+ }
+ else if (!strcmp (name, "n"))
+ {
+ mpi_free (ec->n);
+ ec->n = mpi_copy (newvalue);
+ }
+ else if (!strcmp (name, "h"))
+ {
+ mpi_get_ui (&ec->h, newvalue);
+ }
+ else if (*name == 'q' && (!name[1] || name[1] == '@'))
+ {
+ if (newvalue)
+ {
+ if (!ec->Q)
+ ec->Q = mpi_point_new (0);
+ rc = _gcry_mpi_ec_decode_point (ec->Q, newvalue, ec);
+ }
+ if (rc || !newvalue)
+ {
+ _gcry_mpi_point_release (ec->Q);
+ ec->Q = NULL;
+ }
+ /* Note: We assume that Q matches d and thus do not reset d. */
+ }
+ else if (!strcmp (name, "d"))
+ {
+ mpi_free (ec->d);
+ ec->d = mpi_copy (newvalue);
+ if (ec->d)
+ {
+ /* We need to reset the public key because it may not
+ anymore match. */
+ _gcry_mpi_point_release (ec->Q);
+ ec->Q = NULL;
+ }
+ }
+ else
+ rc = GPG_ERR_UNKNOWN_NAME;
+
+ return rc;
+}
+
+
+/* Store the point NEWVALUE into the context EC under NAME. */
+gpg_err_code_t
+_gcry_ecc_set_point (const char *name, gcry_mpi_point_t newvalue, mpi_ec_t ec)
+{
+ if (!strcmp (name, "g"))
+ {
+ _gcry_mpi_point_release (ec->G);
+ ec->G = point_copy (newvalue);
+ }
+ else if (!strcmp (name, "q"))
+ {
+ _gcry_mpi_point_release (ec->Q);
+ ec->Q = point_copy (newvalue);
+ }
+ else
+ return GPG_ERR_UNKNOWN_NAME;
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-09-11 13:43:29 +0000