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/*
* Copyright 2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
/*
* ECDSA low level APIs are deprecated for public use, but still ok for
* internal use.
*/
#include "internal/deprecated.h"
#include <string.h> /* memcpy */
#include <openssl/crypto.h>
#include <openssl/core_numbers.h>
#include <openssl/core_names.h>
#include <openssl/dsa.h>
#include <openssl/params.h>
#include <openssl/evp.h>
#include <openssl/err.h>
#include "internal/nelem.h"
#include "internal/sizes.h"
#include "internal/cryptlib.h"
#include "prov/providercommonerr.h"
#include "prov/implementations.h"
#include "prov/provider_ctx.h"
#include "crypto/ec.h"
#include "prov/der_ec.h"
static OSSL_OP_signature_newctx_fn ecdsa_newctx;
static OSSL_OP_signature_sign_init_fn ecdsa_signature_init;
static OSSL_OP_signature_verify_init_fn ecdsa_signature_init;
static OSSL_OP_signature_sign_fn ecdsa_sign;
static OSSL_OP_signature_verify_fn ecdsa_verify;
static OSSL_OP_signature_digest_sign_init_fn ecdsa_digest_signverify_init;
static OSSL_OP_signature_digest_sign_update_fn ecdsa_digest_signverify_update;
static OSSL_OP_signature_digest_sign_final_fn ecdsa_digest_sign_final;
static OSSL_OP_signature_digest_verify_init_fn ecdsa_digest_signverify_init;
static OSSL_OP_signature_digest_verify_update_fn ecdsa_digest_signverify_update;
static OSSL_OP_signature_digest_verify_final_fn ecdsa_digest_verify_final;
static OSSL_OP_signature_freectx_fn ecdsa_freectx;
static OSSL_OP_signature_dupctx_fn ecdsa_dupctx;
static OSSL_OP_signature_get_ctx_params_fn ecdsa_get_ctx_params;
static OSSL_OP_signature_gettable_ctx_params_fn ecdsa_gettable_ctx_params;
static OSSL_OP_signature_set_ctx_params_fn ecdsa_set_ctx_params;
static OSSL_OP_signature_settable_ctx_params_fn ecdsa_settable_ctx_params;
static OSSL_OP_signature_get_ctx_md_params_fn ecdsa_get_ctx_md_params;
static OSSL_OP_signature_gettable_ctx_md_params_fn ecdsa_gettable_ctx_md_params;
static OSSL_OP_signature_set_ctx_md_params_fn ecdsa_set_ctx_md_params;
static OSSL_OP_signature_settable_ctx_md_params_fn ecdsa_settable_ctx_md_params;
/*
* What's passed as an actual key is defined by the KEYMGMT interface.
* We happen to know that our KEYMGMT simply passes DSA structures, so
* we use that here too.
*/
typedef struct {
OPENSSL_CTX *libctx;
char *propq;
EC_KEY *ec;
char mdname[OSSL_MAX_NAME_SIZE];
/* The Algorithm Identifier of the combined signature algorithm */
unsigned char aid_buf[OSSL_MAX_ALGORITHM_ID_SIZE];
unsigned char *aid;
size_t aid_len;
size_t mdsize;
EVP_MD *md;
EVP_MD_CTX *mdctx;
/*
* This indicates that KAT (CAVS) test is running. Externally an app will
* override the random callback such that the generated private key and k
* are known.
* Normal operation will loop to choose a new k if the signature is not
* valid - but for this mode of operation it forces a failure instead.
*/
unsigned int kattest;
/*
* Internally used to cache the results of calling the EC group
* sign_setup() methods which are then passed to the sign operation.
* This is used by CAVS failure tests to terminate a loop if the signature
* is not valid.
* This could of also been done with a simple flag.
*/
BIGNUM *kinv;
BIGNUM *r;
} PROV_ECDSA_CTX;
static void *ecdsa_newctx(void *provctx, const char *propq)
{
PROV_ECDSA_CTX *ctx = OPENSSL_zalloc(sizeof(PROV_ECDSA_CTX));
if (ctx == NULL)
return NULL;
ctx->libctx = PROV_LIBRARY_CONTEXT_OF(provctx);
if (propq != NULL && (ctx->propq = OPENSSL_strdup(propq)) == NULL) {
OPENSSL_free(ctx);
ctx = NULL;
ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
}
return ctx;
}
static int ecdsa_signature_init(void *vctx, void *ec)
{
PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
if (ctx == NULL || ec == NULL || !EC_KEY_up_ref(ec))
return 0;
EC_KEY_free(ctx->ec);
ctx->ec = ec;
return 1;
}
static int ecdsa_sign(void *vctx, unsigned char *sig, size_t *siglen,
size_t sigsize, const unsigned char *tbs, size_t tbslen)
{
PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
int ret;
unsigned int sltmp;
size_t ecsize = ECDSA_size(ctx->ec);
if (sig == NULL) {
*siglen = ecsize;
return 1;
}
if (ctx->kattest && !ECDSA_sign_setup(ctx->ec, NULL, &ctx->kinv, &ctx->r))
return 0;
if (sigsize < (size_t)ecsize)
return 0;
if (ctx->mdsize != 0 && tbslen != ctx->mdsize)
return 0;
ret = ECDSA_sign_ex(0, tbs, tbslen, sig, &sltmp, ctx->kinv, ctx->r, ctx->ec);
if (ret <= 0)
return 0;
*siglen = sltmp;
return 1;
}
static int ecdsa_verify(void *vctx, const unsigned char *sig, size_t siglen,
const unsigned char *tbs, size_t tbslen)
{
PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
if (ctx->mdsize != 0 && tbslen != ctx->mdsize)
return 0;
return ECDSA_verify(0, tbs, tbslen, sig, siglen, ctx->ec);
}
static int get_md_nid(const EVP_MD *md)
{
/*
* Because the ECDSA library deals with NIDs, we need to translate.
* We do so using EVP_MD_is_a(), and therefore need a name to NID
* map.
*/
static const OSSL_ITEM name_to_nid[] = {
{ NID_sha1, OSSL_DIGEST_NAME_SHA1 },
{ NID_sha224, OSSL_DIGEST_NAME_SHA2_224 },
{ NID_sha256, OSSL_DIGEST_NAME_SHA2_256 },
{ NID_sha384, OSSL_DIGEST_NAME_SHA2_384 },
{ NID_sha512, OSSL_DIGEST_NAME_SHA2_512 },
{ NID_sha3_224, OSSL_DIGEST_NAME_SHA3_224 },
{ NID_sha3_256, OSSL_DIGEST_NAME_SHA3_256 },
{ NID_sha3_384, OSSL_DIGEST_NAME_SHA3_384 },
{ NID_sha3_512, OSSL_DIGEST_NAME_SHA3_512 },
/* TODO - Add SHAKE OIDS when they are standardized */
};
size_t i;
int mdnid = NID_undef;
if (md == NULL)
goto end;
for (i = 0; i < OSSL_NELEM(name_to_nid); i++) {
if (EVP_MD_is_a(md, name_to_nid[i].ptr)) {
mdnid = (int)name_to_nid[i].id;
break;
}
}
if (mdnid == NID_undef)
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_DIGEST);
end:
return mdnid;
}
static void free_md(PROV_ECDSA_CTX *ctx)
{
EVP_MD_CTX_free(ctx->mdctx);
EVP_MD_free(ctx->md);
ctx->mdctx = NULL;
ctx->md = NULL;
ctx->mdsize = 0;
}
static int ecdsa_digest_signverify_init(void *vctx, const char *mdname,
void *ec)
{
PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
int md_nid = NID_undef;
WPACKET pkt;
free_md(ctx);
if (!ecdsa_signature_init(vctx, ec))
return 0;
ctx->md = EVP_MD_fetch(ctx->libctx, mdname
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