providers/implementations/signature/eddsa.c

   1 /*
   2  * Copyright 2020 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <openssl/crypto.h>
  11 #include <openssl/core_dispatch.h>
  12 #include <openssl/core_names.h>
  13 #include <openssl/err.h>
  14 #include <openssl/params.h>
  15 #include <openssl/evp.h>
  16 #include <openssl/err.h>
  17 #include "internal/nelem.h"
  18 #include "internal/sizes.h"
  19 #include "prov/providercommonerr.h"
  20 #include "prov/implementations.h"
  21 #include "prov/providercommonerr.h"
  22 #include "prov/provider_ctx.h"
  23 #include "crypto/ecx.h"
  24
  25 static OSSL_OP_signature_newctx_fn eddsa_newctx;
  26 static OSSL_OP_signature_digest_sign_init_fn eddsa_digest_signverify_init;
  27 static OSSL_OP_signature_digest_sign_fn ed25519_digest_sign;
  28 static OSSL_OP_signature_digest_sign_fn ed448_digest_sign;
  29 static OSSL_OP_signature_digest_verify_fn ed25519_digest_verify;
  30 static OSSL_OP_signature_digest_verify_fn ed448_digest_verify;
  31 static OSSL_OP_signature_freectx_fn eddsa_freectx;
  32 static OSSL_OP_signature_dupctx_fn eddsa_dupctx;
  33
  34 typedef struct {
  35     OPENSSL_CTX *libctx;
  36     ECX_KEY *key;
  37 } PROV_EDDSA_CTX;
  38
  39 static void *eddsa_newctx(void *provctx, const char *propq_unused)
  40 {
  41     PROV_EDDSA_CTX *peddsactx = OPENSSL_zalloc(sizeof(PROV_EDDSA_CTX));
  42
  43     if (peddsactx == NULL) {
  44         PROVerr(0, ERR_R_MALLOC_FAILURE);
  45         return NULL;
  46     }
  47
  48     peddsactx->libctx = PROV_LIBRARY_CONTEXT_OF(provctx);
  49
  50     return peddsactx;
  51 }
  52
  53 static int eddsa_digest_signverify_init(void *vpeddsactx, const char *mdname,
  54                                         void *vedkey)
  55 {
  56     PROV_EDDSA_CTX *peddsactx = (PROV_EDDSA_CTX *)vpeddsactx;
  57     ECX_KEY *edkey = (ECX_KEY *)vedkey;
  58
  59     if (mdname != NULL && mdname[0] != '\0') {
  60         PROVerr(0, PROV_R_INVALID_DIGEST);
  61         return 0;
  62     }
  63
  64     if (!ecx_key_up_ref(edkey)) {
  65         PROVerr(0, ERR_R_INTERNAL_ERROR);
  66         return 0;
  67     }
  68
  69     peddsactx->key = edkey;
  70
  71     return 1;
  72 }
  73
  74 int ed25519_digest_sign(void *vpeddsactx, unsigned char *sigret,
  75                         size_t *siglen, size_t sigsize,
  76                         const unsigned char *tbs, size_t tbslen)
  77 {
  78     PROV_EDDSA_CTX *peddsactx = (PROV_EDDSA_CTX *)vpeddsactx;
  79     const ECX_KEY *edkey = peddsactx->key;
  80
  81     if (sigret == NULL) {
  82         *siglen = ED25519_SIGSIZE;
  83         return 1;
  84     }
  85     if (sigsize < ED25519_SIGSIZE) {
  86         PROVerr(0, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
  87         return 0;
  88     }
  89
  90     if (ED25519_sign(sigret, tbs, tbslen, edkey->pubkey, edkey->privkey,
  91                      peddsactx->libctx, NULL) == 0) {
  92         PROVerr(0, PROV_R_FAILED_TO_SIGN);
  93         return 0;
  94     }
  95     *siglen = ED25519_SIGSIZE;
  96     return 1;
  97 }
  98
  99 int ed448_digest_sign(void *vpeddsactx, unsigned char *sigret,
 100                       size_t *siglen, size_t sigsize,
 101                       const unsigned char *tbs, size_t tbslen)
 102 {
 103     PROV_EDDSA_CTX *peddsactx = (PROV_EDDSA_CTX *)vpeddsactx;
 104     const ECX_KEY *edkey = peddsactx->key;
 105
 106     if (sigret == NULL) {
 107         *siglen = ED448_SIGSIZE;
 108         return 1;
 109     }
 110     if (sigsize < ED448_SIGSIZE) {
 111         PROVerr(0, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
 112         return 0;
 113     }
 114
 115     if (ED448_sign(peddsactx->libctx, sigret, tbs, tbslen, edkey->pubkey,
 116                    edkey->privkey, NULL, 0) == 0) {
 117         PROVerr(0, PROV_R_FAILED_TO_SIGN);
 118         return 0;
 119     }
 120     *siglen = ED448_SIGSIZE;
 121     return 1;
 122 }
 123
 124 int ed25519_digest_verify(void *vpeddsactx, const unsigned char *sig,
 125                           size_t siglen, const unsigned char *tbs,
 126                           size_t tbslen)
 127 {
 128     PROV_EDDSA_CTX *peddsactx = (PROV_EDDSA_CTX *)vpeddsactx;
 129     const ECX_KEY *edkey = peddsactx->key;
 130
 131     if (siglen != ED25519_SIGSIZE)
 132         return 0;
 133
 134     return ED25519_verify(tbs, tbslen, sig, edkey->pubkey, peddsactx->libctx,
 135                           NULL);
 136 }
 137
 138 int ed448_digest_verify(void *vpeddsactx, const unsigned char *sig,
 139                         size_t siglen, const unsigned char *tbs,
 140                         size_t tbslen)
 141 {
 142     PROV_EDDSA_CTX *peddsactx = (PROV_EDDSA_CTX *)vpeddsactx;
 143     const ECX_KEY *edkey = peddsactx->key;
 144
 145     if (siglen != ED448_SIGSIZE)
 146         return 0;
 147
 148     return ED448_verify(peddsactx->libctx, tbs, tbslen, sig, edkey->pubkey,
 149                         NULL, 0);
 150 }
 151
 152 static void eddsa_freectx(void *vpeddsactx)
 153 {
 154     PROV_EDDSA_CTX *peddsactx = (PROV_EDDSA_CTX *)vpeddsactx;
 155
 156     ecx_key_free(peddsactx->key);
 157
 158     OPENSSL_free(peddsactx);
 159 }
 160
 161 static void *eddsa_dupctx(void *vpeddsactx)
 162 {
 163     PROV_EDDSA_CTX *srcctx = (PROV_EDDSA_CTX *)vpeddsactx;
 164     PROV_EDDSA_CTX *dstctx;
 165
 166     dstctx = OPENSSL_zalloc(sizeof(*srcctx));
 167     if (dstctx == NULL)
 168         return NULL;
 169
 170     *dstctx = *srcctx;
 171     dstctx->key = NULL;
 172
 173     if (srcctx->key != NULL && !ecx_key_up_ref(srcctx->key)) {
 174         PROVerr(0, ERR_R_INTERNAL_ERROR);
 175         goto err;
 176     }
 177     dstctx->key = srcctx->key;
 178
 179     return dstctx;
 180  err:
 181     eddsa_freectx(dstctx);
 182     return NULL;
 183 }
 184
 185 const OSSL_DISPATCH ed25519_signature_functions[] = {
 186     { OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))eddsa_newctx },
 187     { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT,
 188       (void (*)(void))eddsa_digest_signverify_init },
 189     { OSSL_FUNC_SIGNATURE_DIGEST_SIGN,
 190       (void (*)(void))ed25519_digest_sign },
 191     { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_INIT,
 192       (void (*)(void))eddsa_digest_signverify_init },
 193     { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY,
 194       (void (*)(void))ed25519_digest_verify },
 195     { OSSL_FUNC_SIGNATURE_FREECTX, (void (*)(void))eddsa_freectx },
 196     { OSSL_FUNC_SIGNATURE_DUPCTX, (void (*)(void))eddsa_dupctx },
 197     { 0, NULL }
 198 };
 199
 200 const OSSL_DISPATCH ed448_signature_functions[] = {
 201     { OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))eddsa_newctx },
 202     { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT,
 203       (void (*)(void))eddsa_digest_signverify_init },
 204     { OSSL_FUNC_SIGNATURE_DIGEST_SIGN,
 205       (void (*)(void))ed448_digest_sign },
 206     { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_INIT,
 207       (void (*)(void))eddsa_digest_signverify_init },
 208     { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY,
 209       (void (*)(void))ed448_digest_verify },
 210     { OSSL_FUNC_SIGNATURE_FREECTX, (void (*)(void))eddsa_freectx },
 211     { OSSL_FUNC_SIGNATURE_DUPCTX, (void (*)(void))eddsa_dupctx },
 212     { 0, NULL }
 213 };