1 /* 2 * Copyright (C) 2017 - This file is part of libecc project 3 * 4 * Authors: 5 * Ryad BENADJILA <ryadbenadjila@gmail.com> 6 * Arnaud EBALARD <arnaud.ebalard@ssi.gouv.fr> 7 * Jean-Pierre FLORI <jean-pierre.flori@ssi.gouv.fr> 8 * 9 * Contributors: 10 * Nicolas VIVET <nicolas.vivet@ssi.gouv.fr> 11 * Karim KHALFALLAH <karim.khalfallah@ssi.gouv.fr> 12 * 13 * This software is licensed under a dual BSD and GPL v2 license. 14 * See LICENSE file at the root folder of the project. 15 */ 16 #include <libecc/lib_ecc_config.h> 17 #ifdef WITH_SIG_DECDSA 18 19 #if !defined(WITH_HMAC) 20 #error "DECDSA signature needs HMAC, please activate it!" 21 #endif 22 #include <libecc/hash/hmac.h> 23 24 #include <libecc/nn/nn_rand.h> 25 #include <libecc/nn/nn_mul_public.h> 26 #include <libecc/nn/nn_logical.h> 27 28 #include <libecc/sig/sig_algs_internal.h> 29 #include <libecc/sig/ec_key.h> 30 #include <libecc/utils/utils.h> 31 #ifdef VERBOSE_INNER_VALUES 32 #define EC_SIG_ALG "DECDSA" 33 #endif 34 #include <libecc/utils/dbg_sig.h> 35 36 int decdsa_init_pub_key(ec_pub_key *out_pub, const ec_priv_key *in_priv) 37 { 38 return __ecdsa_init_pub_key(out_pub, in_priv, DECDSA); 39 } 40 41 int decdsa_siglen(u16 p_bit_len, u16 q_bit_len, u8 hsize, u8 blocksize, u8 *siglen) 42 { 43 return __ecdsa_siglen(p_bit_len, q_bit_len, hsize, blocksize, siglen); 44 } 45 46 int _decdsa_sign_init(struct ec_sign_context *ctx) 47 { 48 int ret; 49 50 /* Override our random source with NULL since we want a deterministic 51 * generation. 52 */ 53 MUST_HAVE((ctx != NULL), ret, err); 54 55 ctx->rand = NULL; 56 ret = __ecdsa_sign_init(ctx, DECDSA); 57 58 err: 59 return ret; 60 } 61 62 int _decdsa_sign_update(struct ec_sign_context *ctx, 63 const u8 *chunk, u32 chunklen) 64 { 65 int ret; 66 67 /* NOTE: for deterministic ECDSA, the random source MUST be NULL, hence 68 * the following check. 69 */ 70 MUST_HAVE((ctx != NULL) && (ctx->rand == NULL), ret, err); 71 72 ret = __ecdsa_sign_update(ctx, chunk, chunklen, DECDSA); 73 74 err: 75 return ret; 76 } 77 78 int _decdsa_sign_finalize(struct ec_sign_context *ctx, u8 *sig, u8 siglen) 79 { 80 int ret; 81 82 /* NOTE: for deterministic ECDSA, the random source MUST be NULL, hence 83 * the following check. 84 */ 85 MUST_HAVE((ctx != NULL) && (ctx->rand == NULL), ret, err); 86 87 ret = __ecdsa_sign_finalize(ctx, sig, siglen, DECDSA); 88 89 err: 90 return ret; 91 } 92 93 int _decdsa_verify_init(struct ec_verify_context *ctx, const u8 *sig, u8 siglen) 94 { 95 return __ecdsa_verify_init(ctx, sig, siglen, DECDSA); 96 } 97 98 int _decdsa_verify_update(struct ec_verify_context *ctx, 99 const u8 *chunk, u32 chunklen) 100 { 101 return __ecdsa_verify_update(ctx, chunk, chunklen, DECDSA); 102 } 103 104 int _decdsa_verify_finalize(struct ec_verify_context *ctx) 105 { 106 return __ecdsa_verify_finalize(ctx, DECDSA); 107 } 108 109 int decdsa_public_key_from_sig(ec_pub_key *out_pub1, ec_pub_key *out_pub2, const ec_params *params, 110 const u8 *sig, u8 siglen, const u8 *hash, u8 hsize) 111 { 112 return __ecdsa_public_key_from_sig(out_pub1, out_pub2, params, sig, siglen, hash, hsize, DECDSA); 113 } 114 115 #else /* WITH_SIG_DECDSA */ 116 117 /* 118 * Dummy definition to avoid the empty translation unit ISO C warning 119 */ 120 typedef int dummy; 121 #endif /* WITH_SIG_DECDSA */ 122