/src/openssl30/providers/implementations/signature/ecdsa_sig.c

Source (jump to first uncovered line)
/*
 * Copyright 2020-2021 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_dispatch.h>
#include <openssl/core_names.h>
#include <openssl/dsa.h>
#include <openssl/params.h>
#include <openssl/evp.h>
#include <openssl/err.h>
#include <openssl/proverr.h>
#include "internal/nelem.h"
#include "internal/sizes.h"
#include "internal/cryptlib.h"
#include "prov/providercommon.h"
#include "prov/implementations.h"
#include "prov/provider_ctx.h"
#include "prov/securitycheck.h"
#include "crypto/ec.h"
#include "prov/der_ec.h"

static OSSL_FUNC_signature_newctx_fn ecdsa_newctx;
static OSSL_FUNC_signature_sign_init_fn ecdsa_sign_init;
static OSSL_FUNC_signature_verify_init_fn ecdsa_verify_init;
static OSSL_FUNC_signature_sign_fn ecdsa_sign;
static OSSL_FUNC_signature_verify_fn ecdsa_verify;
static OSSL_FUNC_signature_digest_sign_init_fn ecdsa_digest_sign_init;
static OSSL_FUNC_signature_digest_sign_update_fn ecdsa_digest_signverify_update;
static OSSL_FUNC_signature_digest_sign_final_fn ecdsa_digest_sign_final;
static OSSL_FUNC_signature_digest_verify_init_fn ecdsa_digest_verify_init;
static OSSL_FUNC_signature_digest_verify_update_fn ecdsa_digest_signverify_update;
static OSSL_FUNC_signature_digest_verify_final_fn ecdsa_digest_verify_final;
static OSSL_FUNC_signature_freectx_fn ecdsa_freectx;
static OSSL_FUNC_signature_dupctx_fn ecdsa_dupctx;
static OSSL_FUNC_signature_get_ctx_params_fn ecdsa_get_ctx_params;
static OSSL_FUNC_signature_gettable_ctx_params_fn ecdsa_gettable_ctx_params;
static OSSL_FUNC_signature_set_ctx_params_fn ecdsa_set_ctx_params;
static OSSL_FUNC_signature_settable_ctx_params_fn ecdsa_settable_ctx_params;
static OSSL_FUNC_signature_get_ctx_md_params_fn ecdsa_get_ctx_md_params;
static OSSL_FUNC_signature_gettable_ctx_md_params_fn ecdsa_gettable_ctx_md_params;
static OSSL_FUNC_signature_set_ctx_md_params_fn ecdsa_set_ctx_md_params;
static OSSL_FUNC_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 {
    OSSL_LIB_CTX *libctx;
    char *propq;
    EC_KEY *ec;
    char mdname[OSSL_MAX_NAME_SIZE];

    /*
     * Flag to determine if the hash function can be changed (1) or not (0)
     * Because it's dangerous to change during a DigestSign or DigestVerify
     * operation, this flag is cleared by their Init function, and set again
     * by their Final function.
     */
    unsigned int flag_allow_md : 1;

    /* 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;
    int operation;

    EVP_MD *md;
    EVP_MD_CTX *mdctx;
    /*
     * 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;
#if !defined(OPENSSL_NO_ACVP_TESTS)
    /*
     * 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;
#endif
} PROV_ECDSA_CTX;

static void *ecdsa_newctx(void *provctx, const char *propq)
{
    PROV_ECDSA_CTX *ctx;

    if (!ossl_prov_is_running())
        return NULL;

    ctx = OPENSSL_zalloc(sizeof(PROV_ECDSA_CTX));
    if (ctx == NULL)
        return NULL;

    ctx->flag_allow_md = 1;
    ctx->libctx = PROV_LIBCTX_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_signverify_init(void *vctx, void *ec,
                                 const OSSL_PARAM params[], int operation)
{
    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;

    if (!ossl_prov_is_running()
            || ctx == NULL)
        return 0;

    if (ec == NULL && ctx->ec == NULL) {
        ERR_raise(ERR_LIB_PROV, PROV_R_NO_KEY_SET);
        return 0;
    }

    if (ec != NULL) {
        if (!ossl_ec_check_key(ctx->libctx, ec, operation == EVP_PKEY_OP_SIGN))
            return 0;
        if (!EC_KEY_up_ref(ec))
            return 0;
        EC_KEY_free(ctx->ec);
        ctx->ec = ec;
    }

    ctx->operation = operation;

    if (!ecdsa_set_ctx_params(ctx, params))
        return 0;

    return 1;
}

static int ecdsa_sign_init(void *vctx, void *ec, const OSSL_PARAM params[])
{
    return ecdsa_signverify_init(vctx, ec, params, EVP_PKEY_OP_SIGN);
}

static int ecdsa_verify_init(void *vctx, void *ec, const OSSL_PARAM params[])
{
    return ecdsa_signverify_init(vctx, ec, params, EVP_PKEY_OP_VERIFY);
}

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 (!ossl_prov_is_running())
        return 0;

    if (sig == NULL) {
        *siglen = ecsize;
        return 1;
    }

#if !defined(OPENSSL_NO_ACVP_TESTS)
    if (ctx->kattest && !ECDSA_sign_setup(ctx->ec, NULL, &ctx->kinv, &ctx->r))
        return 0;
#endif

    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 (!ossl_prov_is_running() || (ctx->mdsize != 0 && tbslen != ctx->mdsize))
        return 0;

    return ECDSA_verify(0, tbs, tbslen, sig, siglen, ctx->ec);
}

static int ecdsa_setup_md(PROV_ECDSA_CTX *ctx, const char *mdname,
                          const char *mdprops)
{
    EVP_MD *md = NULL;
    size_t mdname_len;
    int md_nid, sha1_allowed;
    WPACKET pkt;

    if (mdname == NULL)
        return 1;

    mdname_len = strlen(mdname);
    if (mdname_len >= sizeof(ctx->mdname)) {
        ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
                       "%s exceeds name buffer length", mdname);
        return 0;
    }
    if (mdprops == NULL)
        mdprops = ctx->propq;
    md = EVP_MD_fetch(ctx->libctx, mdname, mdprops);
    if (md == NULL) {
        ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
                       "%s could not be fetched", mdname);
        return 0;
    }
    sha1_allowed = (ctx->operation != EVP_PKEY_OP_SIGN);
    md_nid = ossl_digest_get_approved_nid_with_sha1(ctx->libctx, md,
                                                    sha1_allowed);
    if (md_nid < 0) {
        ERR_raise_data(ERR_LIB_PROV, PROV_R_DIGEST_NOT_ALLOWED,
                       "digest=%s", mdname);
        EVP_MD_free(md);
        return 0;
    }

    if (!ctx->flag_allow_md) {
        if (ctx->mdname[0] != '\0' && !EVP_MD_is_a(md, ctx->mdname)) {
            ERR_raise_data(ERR_LIB_PROV, PROV_R_DIGEST_NOT_ALLOWED,
                           "digest %s != %s", mdname, ctx->mdname);
            EVP_MD_free(md);
            return 0;
        }
        EVP_MD_free(md);
        return 1;
    }

    EVP_MD_CTX_free(ctx->mdctx);
    EVP_MD_free(ctx->md);

    ctx->aid_len = 0;
    if (WPACKET_init_der(&pkt, ctx->aid_buf, sizeof(ctx->aid_buf))
        && ossl_DER_w_algorithmIdentifier_ECDSA_with_MD(&pkt, -1, ctx->ec,
                                                        md_nid)
        && WPACKET_finish(&pkt)) {
        WPACKET_get_total_written(&pkt, &ctx->aid_len);
        ctx->aid = WPACKET_get_curr(&pkt);
    }
    WPACKET_cleanup(&pkt);
    ctx->mdctx = NULL;
    ctx->md = md;
    ctx->mdsize = EVP_MD_get_size(ctx->md);
    OPENSSL_strlcpy(ctx->mdname, mdname, sizeof(ctx->mdname));

    return 1;
}

static int ecdsa_digest_signverify_init(void *vctx, const char *mdname,
                                        void *ec, const OSSL_PARAM params[],
                                        int operation)
{
    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;

    if (!ossl_prov_is_running())
        return 0;

    if (!ecdsa_signverify_init(vctx, ec, params, operation)
        || !ecdsa_setup_md(ctx, mdname, NULL))
        return 0;

    ctx->flag_allow_md = 0;

    if (ctx->mdctx == NULL) {
        ctx->mdctx = EVP_MD_CTX_new();
        if (ctx->mdctx == NULL)
            goto error;
    }

    if (!EVP_DigestInit_ex2(ctx->mdctx, ctx->md, params))
        goto error;
    return 1;
error:
    EVP_MD_CTX_free(ctx->mdctx);
    ctx->mdctx = NULL;
    return 0;
}

static int ecdsa_digest_sign_init(void *vctx, const char *mdname, void *ec,
                                  const OSSL_PARAM params[])
{
    return ecdsa_digest_signverify_init(vctx, mdname, ec, params,
                                        EVP_PKEY_OP_SIGN);
}

static int ecdsa_digest_verify_init(void *vctx, const char *mdname, void *ec,
                                    const OSSL_PARAM params[])
{
    return ecdsa_digest_signverify_init(vctx, mdname, ec, params,
                                        EVP_PKEY_OP_VERIFY);
}

int ecdsa_digest_signverify_update(void *vctx, const unsigned char *data,
                                   size_t datalen)
{
    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;

    if (ctx == NULL || ctx->mdctx == NULL)
        return 0;

    return EVP_DigestUpdate(ctx->mdctx, data, datalen);
}

int ecdsa_digest_sign_final(void *vctx, unsigned char *sig, size_t *siglen,
                            size_t sigsize)
{
    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
    unsigned char digest[EVP_MAX_MD_SIZE];
    unsigned int dlen = 0;

    if (!ossl_prov_is_running() || ctx == NULL || ctx->mdctx == NULL)
        return 0;

    /*
     * If sig is NULL then we're just finding out the sig size. Other fields
     * are ignored. Defer to ecdsa_sign.
     */
    if (sig != NULL
        && !EVP_DigestFinal_ex(ctx->mdctx, digest, &dlen))
        return 0;
    ctx->flag_allow_md = 1;
    return ecdsa_sign(vctx, sig, siglen, sigsize, digest, (size_t)dlen);
}

int ecdsa_digest_verify_final(void *vctx, const unsigned char *sig,
                              size_t siglen)
{
    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
    unsigned char digest[EVP_MAX_MD_SIZE];
    unsigned int dlen = 0;

    if (!ossl_prov_is_running() || ctx == NULL || ctx->mdctx == NULL)
        return 0;

    if (!EVP_DigestFinal_ex(ctx->mdctx, digest, &dlen))
        return 0;
    ctx->flag_allow_md = 1;
    return ecdsa_verify(ctx, sig, siglen, digest, (size_t)dlen);
}

static void ecdsa_freectx(void *vctx)
{
    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;

    OPENSSL_free(ctx->propq);
    EVP_MD_CTX_free(ctx->mdctx);
    EVP_MD_free(ctx->md);
    ctx->propq = NULL;
    ctx->mdctx = NULL;
    ctx->md = NULL;
    ctx->mdsize = 0;
    EC_KEY_free(ctx->ec);
    BN_clear_free(ctx->kinv);
    BN_clear_free(ctx->r);
    OPENSSL_free(ctx);
}

static void *ecdsa_dupctx(void *vctx)
{
    PROV_ECDSA_CTX *srcctx = (PROV_ECDSA_CTX *)vctx;
    PROV_ECDSA_CTX *dstctx;

    if (!ossl_prov_is_running())
        return NULL;

    dstctx = OPENSSL_zalloc(sizeof(*srcctx));
    if (dstctx == NULL)
        return NULL;

    *dstctx = *srcctx;
    dstctx->ec = NULL;
    dstctx->md = NULL;
    dstctx->mdctx = NULL;
    dstctx->propq = NULL;

    if (srcctx->ec != NULL && !EC_KEY_up_ref(srcctx->ec))
        goto err;
    /* Test KATS should not need to be supported */
    if (srcctx->kinv != NULL || srcctx->r != NULL)
        goto err;
    dstctx->ec = srcctx->ec;

    if (srcctx->md != NULL && !EVP_MD_up_ref(srcctx->md))
        goto err;
    dstctx->md = srcctx->md;

    if (srcctx->mdctx != NULL) {
        dstctx->mdctx = EVP_MD_CTX_new();
        if (dstctx->mdctx == NULL
                || !EVP_MD_CTX_copy_ex(dstctx->mdctx, srcctx->mdctx))
            goto err;
    }

    if (srcctx->propq != NULL) {
        dstctx->propq = OPENSSL_strdup(srcctx->propq);
        if (dstctx->propq == NULL)
            goto err;
    }

    return dstctx;
 err:
    ecdsa_freectx(dstctx);
    return NULL;
}

static int ecdsa_get_ctx_params(void *vctx, OSSL_PARAM *params)
{
    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
    OSSL_PARAM *p;

    if (ctx == NULL)
        return 0;

    p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_ALGORITHM_ID);
    if (p != NULL && !OSSL_PARAM_set_octet_string(p, ctx->aid, ctx->aid_len))
        return 0;

    p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_DIGEST_SIZE);
    if (p != NULL && !OSSL_PARAM_set_size_t(p, ctx->mdsize))
        return 0;

    p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_DIGEST);
    if (p != NULL && !OSSL_PARAM_set_utf8_string(p, ctx->md == NULL
                                                    ? ctx->mdname
                                                    : EVP_MD_get0_name(ctx->md)))
        return 0;

    return 1;
}

static const OSSL_PARAM known_gettable_ctx_params[] = {
    OSSL_PARAM_octet_string(OSSL_SIGNATURE_PARAM_ALGORITHM_ID, NULL, 0),
    OSSL_PARAM_size_t(OSSL_SIGNATURE_PARAM_DIGEST_SIZE, NULL),
    OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
    OSSL_PARAM_END
};

static const OSSL_PARAM *ecdsa_gettable_ctx_params(ossl_unused void *vctx,
                                                   ossl_unused void *provctx)
{
    return known_gettable_ctx_params;
}

static int ecdsa_set_ctx_params(void *vctx, const OSSL_PARAM params[])
{
    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
    const OSSL_PARAM *p;
    size_t mdsize = 0;

    if (ctx == NULL)
        return 0;
    if (params == NULL)
        return 1;

#if !defined(OPENSSL_NO_ACVP_TESTS)
    p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_KAT);
    if (p != NULL && !OSSL_PARAM_get_uint(p, &ctx->kattest))
        return 0;
#endif

    p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST);
    if (p != NULL) {
        char mdname[OSSL_MAX_NAME_SIZE] = "", *pmdname = mdname;
        char mdprops[OSSL_MAX_PROPQUERY_SIZE] = "", *pmdprops = mdprops;
        const OSSL_PARAM *propsp =
            OSSL_PARAM_locate_const(params,
                                    OSSL_SIGNATURE_PARAM_PROPERTIES);

        if (!OSSL_PARAM_get_utf8_string(p, &pmdname, sizeof(mdname)))
            return 0;
        if (propsp != NULL
            && !OSSL_PARAM_get_utf8_string(propsp, &pmdprops, sizeof(mdprops)))
            return 0;
        if (!ecdsa_setup_md(ctx, mdname, mdprops))
            return 0;
    }

    p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST_SIZE);
    if (p != NULL) {
        if (!OSSL_PARAM_get_size_t(p, &mdsize)
            || (!ctx->flag_allow_md && mdsize != ctx->mdsize))
            return 0;
        ctx->mdsize = mdsize;
    }

    return 1;
}

static const OSSL_PARAM settable_ctx_params[] = {
    OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
    OSSL_PARAM_size_t(OSSL_SIGNATURE_PARAM_DIGEST_SIZE, NULL),
    OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PROPERTIES, NULL, 0),
    OSSL_PARAM_uint(OSSL_SIGNATURE_PARAM_KAT, NULL),
    OSSL_PARAM_END
};

static const OSSL_PARAM settable_ctx_params_no_digest[] = {
    OSSL_PARAM_uint(OSSL_SIGNATURE_PARAM_KAT, NULL),
    OSSL_PARAM_END
};

static const OSSL_PARAM *ecdsa_settable_ctx_params(void *vctx,
                                                   ossl_unused void *provctx)
{
    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;

    if (ctx != NULL && !ctx->flag_allow_md)
        return settable_ctx_params_no_digest;
    return settable_ctx_params;
}

static int ecdsa_get_ctx_md_params(void *vctx, OSSL_PARAM *params)
{
    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;

    if (ctx->mdctx == NULL)
        return 0;

    return EVP_MD_CTX_get_params(ctx->mdctx, params);
}

static const OSSL_PARAM *ecdsa_gettable_ctx_md_params(void *vctx)
{
    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;

    if (ctx->md == NULL)
        return 0;

    return EVP_MD_gettable_ctx_params(ctx->md);
}

static int ecdsa_set_ctx_md_params(void *vctx, const OSSL_PARAM params[])
{
    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;

    if (ctx->mdctx == NULL)
        return 0;

    return EVP_MD_CTX_set_params(ctx->mdctx, params);
}

static const OSSL_PARAM *ecdsa_settable_ctx_md_params(void *vctx)
{
    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;

    if (ctx->md == NULL)
        return 0;

    return EVP_MD_settable_ctx_params(ctx->md);
}

const OSSL_DISPATCH ossl_ecdsa_signature_functions[] = {
    { OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))ecdsa_newctx },
    { OSSL_FUNC_SIGNATURE_SIGN_INIT, (void (*)(void))ecdsa_sign_init },
    { OSSL_FUNC_SIGNATURE_SIGN, (void (*)(void))ecdsa_sign },
    { OSSL_FUNC_SIGNATURE_VERIFY_INIT, (void (*)(void))ecdsa_verify_init },
    { OSSL_FUNC_SIGNATURE_VERIFY, (void (*)(void))ecdsa_verify },
    { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT,
      (void (*)(void))ecdsa_digest_sign_init },
    { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_UPDATE,
      (void (*)(void))ecdsa_digest_signverify_update },
    { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_FINAL,
      (void (*)(void))ecdsa_digest_sign_final },
    { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_INIT,
      (void (*)(void))ecdsa_digest_verify_init },
    { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_UPDATE,
      (void (*)(void))ecdsa_digest_signverify_update },
    { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_FINAL,
      (void (*)(void))ecdsa_digest_verify_final },
    { OSSL_FUNC_SIGNATURE_FREECTX, (void (*)(void))ecdsa_freectx },
    { OSSL_FUNC_SIGNATURE_DUPCTX, (void (*)(void))ecdsa_dupctx },
    { OSSL_FUNC_SIGNATURE_GET_CTX_PARAMS, (void (*)(void))ecdsa_get_ctx_params },
    { OSSL_FUNC_SIGNATURE_GETTABLE_CTX_PARAMS,
      (void (*)(void))ecdsa_gettable_ctx_params },
    { OSSL_FUNC_SIGNATURE_SET_CTX_PARAMS, (void (*)(void))ecdsa_set_ctx_params },
    { OSSL_FUNC_SIGNATURE_SETTABLE_CTX_PARAMS,
      (void (*)(void))ecdsa_settable_ctx_params },
    { OSSL_FUNC_SIGNATURE_GET_CTX_MD_PARAMS,
      (void (*)(void))ecdsa_get_ctx_md_params },
    { OSSL_FUNC_SIGNATURE_GETTABLE_CTX_MD_PARAMS,
      (void (*)(void))ecdsa_gettable_ctx_md_params },
    { OSSL_FUNC_SIGNATURE_SET_CTX_MD_PARAMS,
      (void (*)(void))ecdsa_set_ctx_md_params },
    { OSSL_FUNC_SIGNATURE_SETTABLE_CTX_MD_PARAMS,
      (void (*)(void))ecdsa_settable_ctx_md_params },
    { 0, NULL }
};

Coverage Report

Created: 2025-06-13 06:58

Line	Count	Source (jump to first uncovered line)
1		/*
2		* Copyright 2020-2021 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		/*
11		* ECDSA low level APIs are deprecated for public use, but still ok for
12		* internal use.
13		*/
14		#include "internal/deprecated.h"
15
16		#include <string.h> /* memcpy */
17		#include <openssl/crypto.h>
18		#include <openssl/core_dispatch.h>
19		#include <openssl/core_names.h>
20		#include <openssl/dsa.h>
21		#include <openssl/params.h>
22		#include <openssl/evp.h>
23		#include <openssl/err.h>
24		#include <openssl/proverr.h>
25		#include "internal/nelem.h"
26		#include "internal/sizes.h"
27		#include "internal/cryptlib.h"
28		#include "prov/providercommon.h"
29		#include "prov/implementations.h"
30		#include "prov/provider_ctx.h"
31		#include "prov/securitycheck.h"
32		#include "crypto/ec.h"
33		#include "prov/der_ec.h"
34
35		static OSSL_FUNC_signature_newctx_fn ecdsa_newctx;
36		static OSSL_FUNC_signature_sign_init_fn ecdsa_sign_init;
37		static OSSL_FUNC_signature_verify_init_fn ecdsa_verify_init;
38		static OSSL_FUNC_signature_sign_fn ecdsa_sign;
39		static OSSL_FUNC_signature_verify_fn ecdsa_verify;
40		static OSSL_FUNC_signature_digest_sign_init_fn ecdsa_digest_sign_init;
41		static OSSL_FUNC_signature_digest_sign_update_fn ecdsa_digest_signverify_update;
42		static OSSL_FUNC_signature_digest_sign_final_fn ecdsa_digest_sign_final;
43		static OSSL_FUNC_signature_digest_verify_init_fn ecdsa_digest_verify_init;
44		static OSSL_FUNC_signature_digest_verify_update_fn ecdsa_digest_signverify_update;
45		static OSSL_FUNC_signature_digest_verify_final_fn ecdsa_digest_verify_final;
46		static OSSL_FUNC_signature_freectx_fn ecdsa_freectx;
47		static OSSL_FUNC_signature_dupctx_fn ecdsa_dupctx;
48		static OSSL_FUNC_signature_get_ctx_params_fn ecdsa_get_ctx_params;
49		static OSSL_FUNC_signature_gettable_ctx_params_fn ecdsa_gettable_ctx_params;
50		static OSSL_FUNC_signature_set_ctx_params_fn ecdsa_set_ctx_params;
51		static OSSL_FUNC_signature_settable_ctx_params_fn ecdsa_settable_ctx_params;
52		static OSSL_FUNC_signature_get_ctx_md_params_fn ecdsa_get_ctx_md_params;
53		static OSSL_FUNC_signature_gettable_ctx_md_params_fn ecdsa_gettable_ctx_md_params;
54		static OSSL_FUNC_signature_set_ctx_md_params_fn ecdsa_set_ctx_md_params;
55		static OSSL_FUNC_signature_settable_ctx_md_params_fn ecdsa_settable_ctx_md_params;
56
57		/*
58		* What's passed as an actual key is defined by the KEYMGMT interface.
59		* We happen to know that our KEYMGMT simply passes DSA structures, so
60		* we use that here too.
61		*/
62
63		typedef struct {
64		OSSL_LIB_CTX *libctx;
65		char *propq;
66		EC_KEY *ec;
67		char mdname[OSSL_MAX_NAME_SIZE];
68
69		/*
70		* Flag to determine if the hash function can be changed (1) or not (0)
71		* Because it's dangerous to change during a DigestSign or DigestVerify
72		* operation, this flag is cleared by their Init function, and set again
73		* by their Final function.
74		*/
75		unsigned int flag_allow_md : 1;
76
77		/* The Algorithm Identifier of the combined signature algorithm */
78		unsigned char aid_buf[OSSL_MAX_ALGORITHM_ID_SIZE];
79		unsigned char *aid;
80		size_t aid_len;
81		size_t mdsize;
82		int operation;
83
84		EVP_MD *md;
85		EVP_MD_CTX *mdctx;
86		/*
87		* Internally used to cache the results of calling the EC group
88		* sign_setup() methods which are then passed to the sign operation.
89		* This is used by CAVS failure tests to terminate a loop if the signature
90		* is not valid.
91		* This could of also been done with a simple flag.
92		*/
93		BIGNUM *kinv;
94		BIGNUM *r;
95		#if !defined(OPENSSL_NO_ACVP_TESTS)
96		/*
97		* This indicates that KAT (CAVS) test is running. Externally an app will
98		* override the random callback such that the generated private key and k
99		* are known.
100		* Normal operation will loop to choose a new k if the signature is not
101		* valid - but for this mode of operation it forces a failure instead.
102		*/
103		unsigned int kattest;
104		#endif
105		} PROV_ECDSA_CTX;
106
107		static void ecdsa_newctx(void provctx, const char *propq)
108	10.8k	{
109	10.8k	PROV_ECDSA_CTX *ctx;
110
111	10.8k	if (!ossl_prov_is_running())
112	0	return NULL;
113
114	10.8k	ctx = OPENSSL_zalloc(sizeof(PROV_ECDSA_CTX));
115	10.8k	if (ctx == NULL)
116	0	return NULL;
117
118	10.8k	ctx->flag_allow_md = 1;
119	10.8k	ctx->libctx = PROV_LIBCTX_OF(provctx);
120	10.8k	if (propq != NULL && (ctx->propq = OPENSSL_strdup(propq)) == NULL) {
121	0	OPENSSL_free(ctx);
122	0	ctx = NULL;
123	0	ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
124	0	}
125	10.8k	return ctx;
126	10.8k	}
127
128		static int ecdsa_signverify_init(void vctx, void ec,
129		const OSSL_PARAM params[], int operation)
130	7.45k	{
131	7.45k	PROV_ECDSA_CTX ctx = (PROV_ECDSA_CTX )vctx;
132
133	7.45k	if (!ossl_prov_is_running()
134	7.45k	\|\| ctx == NULL)
135	0	return 0;
136
137	7.45k	if (ec == NULL && ctx->ec == NULL) {
138	0	ERR_raise(ERR_LIB_PROV, PROV_R_NO_KEY_SET);
139	0	return 0;
140	0	}
141
142	7.45k	if (ec != NULL) {
143	7.45k	if (!ossl_ec_check_key(ctx->libctx, ec, operation == EVP_PKEY_OP_SIGN))
144	0	return 0;
145	7.45k	if (!EC_KEY_up_ref(ec))
146	0	return 0;
147	7.45k	EC_KEY_free(ctx->ec);
148	7.45k	ctx->ec = ec;
149	7.45k	}
150
151	7.45k	ctx->operation = operation;
152
153	7.45k	if (!ecdsa_set_ctx_params(ctx, params))
154	0	return 0;
155
156	7.45k	return 1;
157	7.45k	}
158
159		static int ecdsa_sign_init(void vctx, void ec, const OSSL_PARAM params[])
160	0	{
161	0	return ecdsa_signverify_init(vctx, ec, params, EVP_PKEY_OP_SIGN);
162	0	}
163
164		static int ecdsa_verify_init(void vctx, void ec, const OSSL_PARAM params[])
165	0	{
166	0	return ecdsa_signverify_init(vctx, ec, params, EVP_PKEY_OP_VERIFY);
167	0	}
168
169		static int ecdsa_sign(void vctx, unsigned char sig, size_t *siglen,
170		size_t sigsize, const unsigned char *tbs, size_t tbslen)
171	2.33k	{
172	2.33k	PROV_ECDSA_CTX ctx = (PROV_ECDSA_CTX )vctx;
173	2.33k	int ret;
174	2.33k	unsigned int sltmp;
175	2.33k	size_t ecsize = ECDSA_size(ctx->ec);
176
177	2.33k	if (!ossl_prov_is_running())
178	0	return 0;
179
180	2.33k	if (sig == NULL) {
181	1.16k	*siglen = ecsize;
182	1.16k	return 1;
183	1.16k	}
184
185		#if !defined(OPENSSL_NO_ACVP_TESTS)
186		if (ctx->kattest && !ECDSA_sign_setup(ctx->ec, NULL, &ctx->kinv, &ctx->r))
187		return 0;
188		#endif
189
190	1.16k	if (sigsize < (size_t)ecsize)
191	0	return 0;
192
193	1.16k	if (ctx->mdsize != 0 && tbslen != ctx->mdsize)
194	0	return 0;
195
196	1.16k	ret = ECDSA_sign_ex(0, tbs, tbslen, sig, &sltmp, ctx->kinv, ctx->r, ctx->ec);
197	1.16k	if (ret <= 0)
198	0	return 0;
199
200	1.16k	*siglen = sltmp;
201	1.16k	return 1;
202	1.16k	}
203
204		static int ecdsa_verify(void vctx, const unsigned char sig, size_t siglen,
205		const unsigned char *tbs, size_t tbslen)
206	990	{
207	990	PROV_ECDSA_CTX ctx = (PROV_ECDSA_CTX )vctx;
208
209	990	if (!ossl_prov_is_running() \|\| (ctx->mdsize != 0 && tbslen != ctx->mdsize))
210	0	return 0;
211
212	990	return ECDSA_verify(0, tbs, tbslen, sig, siglen, ctx->ec);
213	990	}
214
215		static int ecdsa_setup_md(PROV_ECDSA_CTX ctx, const char mdname,
216		const char *mdprops)
217	7.45k	{
218	7.45k	EVP_MD *md = NULL;
219	7.45k	size_t mdname_len;
220	7.45k	int md_nid, sha1_allowed;
221	7.45k	WPACKET pkt;
222
223	7.45k	if (mdname == NULL)
224	0	return 1;
225
226	7.45k	mdname_len = strlen(mdname);
227	7.45k	if (mdname_len >= sizeof(ctx->mdname)) {
228	0	ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
229	0	"%s exceeds name buffer length", mdname);
230	0	return 0;
231	0	}
232	7.45k	if (mdprops == NULL)
233	7.45k	mdprops = ctx->propq;
234	7.45k	md = EVP_MD_fetch(ctx->libctx, mdname, mdprops);
235	7.45k	if (md == NULL) {
236	0	ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
237	0	"%s could not be fetched", mdname);
238	0	return 0;
239	0	}
240	7.45k	sha1_allowed = (ctx->operation != EVP_PKEY_OP_SIGN);
241	7.45k	md_nid = ossl_digest_get_approved_nid_with_sha1(ctx->libctx, md,
242	7.45k	sha1_allowed);
243	7.45k	if (md_nid < 0) {
244	0	ERR_raise_data(ERR_LIB_PROV, PROV_R_DIGEST_NOT_ALLOWED,
245	0	"digest=%s", mdname);
246	0	EVP_MD_free(md);
247	0	return 0;
248	0	}
249
250	7.45k	if (!ctx->flag_allow_md) {
251	0	if (ctx->mdname[0] != '\0' && !EVP_MD_is_a(md, ctx->mdname)) {
252	0	ERR_raise_data(ERR_LIB_PROV, PROV_R_DIGEST_NOT_ALLOWED,
253	0	"digest %s != %s", mdname, ctx->mdname);
254	0	EVP_MD_free(md);
255	0	return 0;
256	0	}
257	0	EVP_MD_free(md);
258	0	return 1;
259	0	}
260
261	7.45k	EVP_MD_CTX_free(ctx->mdctx);
262	7.45k	EVP_MD_free(ctx->md);
263
264	7.45k	ctx->aid_len = 0;
265	7.45k	if (WPACKET_init_der(&pkt, ctx->aid_buf, sizeof(ctx->aid_buf))
266	7.45k	&& ossl_DER_w_algorithmIdentifier_ECDSA_with_MD(&pkt, -1, ctx->ec,
267	7.45k	md_nid)
268	7.45k	&& WPACKET_finish(&pkt)) {
269	7.45k	WPACKET_get_total_written(&pkt, &ctx->aid_len);
270	7.45k	ctx->aid = WPACKET_get_curr(&pkt);
271	7.45k	}
272	7.45k	WPACKET_cleanup(&pkt);
273	7.45k	ctx->mdctx = NULL;
274	7.45k	ctx->md = md;
275	7.45k	ctx->mdsize = EVP_MD_get_size(ctx->md);
276	7.45k	OPENSSL_strlcpy(ctx->mdname, mdname, sizeof(ctx->mdname));
277
278	7.45k	return 1;
279	7.45k	}
280
281		static int ecdsa_digest_signverify_init(void vctx, const char mdname,
282		void *ec, const OSSL_PARAM params[],
283		int operation)
284	7.45k	{
285	7.45k	PROV_ECDSA_CTX ctx = (PROV_ECDSA_CTX )vctx;
286
287	7.45k	if (!ossl_prov_is_running())
288	0	return 0;
289
290	7.45k	if (!ecdsa_signverify_init(vctx, ec, params, operation)
291	7.45k	\|\| !ecdsa_setup_md(ctx, mdname, NULL))
292	0	return 0;
293
294	7.45k	ctx->flag_allow_md = 0;
295
296	7.45k	if (ctx->mdctx == NULL) {
297	7.45k	ctx->mdctx = EVP_MD_CTX_new();
298	7.45k	if (ctx->mdctx == NULL)
299	0	goto error;
300	7.45k	}
301
302	7.45k	if (!EVP_DigestInit_ex2(ctx->mdctx, ctx->md, params))
303	0	goto error;
304	7.45k	return 1;
305	0	error:
306	0	EVP_MD_CTX_free(ctx->mdctx);
307	0	ctx->mdctx = NULL;
308	0	return 0;
309	7.45k	}
310
311		static int ecdsa_digest_sign_init(void vctx, const char mdname, void *ec,
312		const OSSL_PARAM params[])
313	9.54k	{
314	9.54k	return ecdsa_digest_signverify_init(vctx, mdname, ec, params,
315	9.54k	EVP_PKEY_OP_SIGN);
316	9.54k	}
317
318		static int ecdsa_digest_verify_init(void vctx, const char mdname, void *ec,
319		const OSSL_PARAM params[])
320	1.28k	{
321	1.28k	return ecdsa_digest_signverify_init(vctx, mdname, ec, params,
322	1.28k	EVP_PKEY_OP_VERIFY);
323	1.28k	}
324
325		int ecdsa_digest_signverify_update(void vctx, const unsigned char data,
326		size_t datalen)
327	2.84k	{
328	2.84k	PROV_ECDSA_CTX ctx = (PROV_ECDSA_CTX )vctx;
329
330	2.84k	if (ctx == NULL \|\| ctx->mdctx == NULL)
331	0	return 0;
332
333	2.84k	return EVP_DigestUpdate(ctx->mdctx, data, datalen);
334	2.84k	}
335
336		int ecdsa_digest_sign_final(void vctx, unsigned char sig, size_t *siglen,
337		size_t sigsize)
338	3.70k	{
339	3.70k	PROV_ECDSA_CTX ctx = (PROV_ECDSA_CTX )vctx;
340	3.70k	unsigned char digest[EVP_MAX_MD_SIZE];
341	3.70k	unsigned int dlen = 0;
342
343	3.70k	if (!ossl_prov_is_running() \|\| ctx == NULL \|\| ctx->mdctx == NULL)
344	0	return 0;
345
346		/*
347		* If sig is NULL then we're just finding out the sig size. Other fields
348		* are ignored. Defer to ecdsa_sign.
349		*/
350	3.70k	if (sig != NULL
351	3.70k	&& !EVP_DigestFinal_ex(ctx->mdctx, digest, &dlen))
352	0	return 0;
353	3.70k	ctx->flag_allow_md = 1;
354	3.70k	return ecdsa_sign(vctx, sig, siglen, sigsize, digest, (size_t)dlen);
355	3.70k	}
356
357		int ecdsa_digest_verify_final(void vctx, const unsigned char sig,
358		size_t siglen)
359	990	{
360	990	PROV_ECDSA_CTX ctx = (PROV_ECDSA_CTX )vctx;
361	990	unsigned char digest[EVP_MAX_MD_SIZE];
362	990	unsigned int dlen = 0;
363
364	990	if (!ossl_prov_is_running() \|\| ctx == NULL \|\| ctx->mdctx == NULL)
365	0	return 0;
366
367	990	if (!EVP_DigestFinal_ex(ctx->mdctx, digest, &dlen))
368	0	return 0;
369	990	ctx->flag_allow_md = 1;
370	990	return ecdsa_verify(ctx, sig, siglen, digest, (size_t)dlen);
371	990	}
372
373		static void ecdsa_freectx(void *vctx)
374	15.0k	{
375	15.0k	PROV_ECDSA_CTX ctx = (PROV_ECDSA_CTX )vctx;
376
377	15.0k	OPENSSL_free(ctx->propq);
378	15.0k	EVP_MD_CTX_free(ctx->mdctx);
379	15.0k	EVP_MD_free(ctx->md);
380	15.0k	ctx->propq = NULL;
381	15.0k	ctx->mdctx = NULL;
382	15.0k	ctx->md = NULL;
383	15.0k	ctx->mdsize = 0;
384	15.0k	EC_KEY_free(ctx->ec);
385	15.0k	BN_clear_free(ctx->kinv);
386	15.0k	BN_clear_free(ctx->r);
387	15.0k	OPENSSL_free(ctx);
388	15.0k	}
389
390		static void ecdsa_dupctx(void vctx)
391	4.21k	{
392	4.21k	PROV_ECDSA_CTX srcctx = (PROV_ECDSA_CTX )vctx;
393	4.21k	PROV_ECDSA_CTX *dstctx;
394
395	4.21k	if (!ossl_prov_is_running())
396	0	return NULL;
397
398	4.21k	dstctx = OPENSSL_zalloc(sizeof(*srcctx));
399	4.21k	if (dstctx == NULL)
400	0	return NULL;
401
402	4.21k	dstctx = srcctx;
403	4.21k	dstctx->ec = NULL;
404	4.21k	dstctx->md = NULL;
405	4.21k	dstctx->mdctx = NULL;
406	4.21k	dstctx->propq = NULL;
407
408	4.21k	if (srcctx->ec != NULL && !EC_KEY_up_ref(srcctx->ec))
409	0	goto err;
410		/* Test KATS should not need to be supported */
411	4.21k	if (srcctx->kinv != NULL \|\| srcctx->r != NULL)
412	0	goto err;
413	4.21k	dstctx->ec = srcctx->ec;
414
415	4.21k	if (srcctx->md != NULL && !EVP_MD_up_ref(srcctx->md))
416	0	goto err;
417	4.21k	dstctx->md = srcctx->md;
418
419	4.21k	if (srcctx->mdctx != NULL) {
420	4.21k	dstctx->mdctx = EVP_MD_CTX_new();
421	4.21k	if (dstctx->mdctx == NULL
422	4.21k	\|\| !EVP_MD_CTX_copy_ex(dstctx->mdctx, srcctx->mdctx))
423	0	goto err;
424	4.21k	}
425
426	4.21k	if (srcctx->propq != NULL) {
427	0	dstctx->propq = OPENSSL_strdup(srcctx->propq);
428	0	if (dstctx->propq == NULL)
429	0	goto err;
430	0	}
431
432	4.21k	return dstctx;
433	0	err:
434	0	ecdsa_freectx(dstctx);
435	0	return NULL;
436	4.21k	}
437
438		static int ecdsa_get_ctx_params(void vctx, OSSL_PARAM params)
439	0	{
440	0	PROV_ECDSA_CTX ctx = (PROV_ECDSA_CTX )vctx;
441	0	OSSL_PARAM *p;
442
443	0	if (ctx == NULL)
444	0	return 0;
445
446	0	p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_ALGORITHM_ID);
447	0	if (p != NULL && !OSSL_PARAM_set_octet_string(p, ctx->aid, ctx->aid_len))
448	0	return 0;
449
450	0	p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_DIGEST_SIZE);
451	0	if (p != NULL && !OSSL_PARAM_set_size_t(p, ctx->mdsize))
452	0	return 0;
453
454	0	p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_DIGEST);
455	0	if (p != NULL && !OSSL_PARAM_set_utf8_string(p, ctx->md == NULL
456	0	? ctx->mdname
457	0	: EVP_MD_get0_name(ctx->md)))
458	0	return 0;
459
460	0	return 1;
461	0	}
462
463		static const OSSL_PARAM known_gettable_ctx_params[] = {
464		OSSL_PARAM_octet_string(OSSL_SIGNATURE_PARAM_ALGORITHM_ID, NULL, 0),
465		OSSL_PARAM_size_t(OSSL_SIGNATURE_PARAM_DIGEST_SIZE, NULL),
466		OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
467		OSSL_PARAM_END
468		};
469
470		static const OSSL_PARAM ecdsa_gettable_ctx_params(ossl_unused void vctx,
471		ossl_unused void *provctx)
472	0	{
473	0	return known_gettable_ctx_params;
474	0	}
475
476		static int ecdsa_set_ctx_params(void *vctx, const OSSL_PARAM params[])
477	4.88k	{
478	4.88k	PROV_ECDSA_CTX ctx = (PROV_ECDSA_CTX )vctx;
479	4.88k	const OSSL_PARAM *p;
480	4.88k	size_t mdsize = 0;
481
482	4.88k	if (ctx == NULL)
483	0	return 0;
484	4.88k	if (params == NULL)
485	4.88k	return 1;
486
487		#if !defined(OPENSSL_NO_ACVP_TESTS)
488		p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_KAT);
489		if (p != NULL && !OSSL_PARAM_get_uint(p, &ctx->kattest))
490		return 0;
491		#endif
492
493	0	p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST);
494	0	if (p != NULL) {
495	0	char mdname[OSSL_MAX_NAME_SIZE] = "", *pmdname = mdname;
496	0	char mdprops[OSSL_MAX_PROPQUERY_SIZE] = "", *pmdprops = mdprops;
497	0	const OSSL_PARAM *propsp =
498	0	OSSL_PARAM_locate_const(params,
499	0	OSSL_SIGNATURE_PARAM_PROPERTIES);
500
501	0	if (!OSSL_PARAM_get_utf8_string(p, &pmdname, sizeof(mdname)))
502	0	return 0;
503	0	if (propsp != NULL
504	0	&& !OSSL_PARAM_get_utf8_string(propsp, &pmdprops, sizeof(mdprops)))
505	0	return 0;
506	0	if (!ecdsa_setup_md(ctx, mdname, mdprops))
507	0	return 0;
508	0	}
509
510	0	p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST_SIZE);
511	0	if (p != NULL) {
512	0	if (!OSSL_PARAM_get_size_t(p, &mdsize)
513	0	\|\| (!ctx->flag_allow_md && mdsize != ctx->mdsize))
514	0	return 0;
515	0	ctx->mdsize = mdsize;
516	0	}
517
518	0	return 1;
519	0	}
520
521		static const OSSL_PARAM settable_ctx_params[] = {
522		OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
523		OSSL_PARAM_size_t(OSSL_SIGNATURE_PARAM_DIGEST_SIZE, NULL),
524		OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PROPERTIES, NULL, 0),
525		OSSL_PARAM_uint(OSSL_SIGNATURE_PARAM_KAT, NULL),
526		OSSL_PARAM_END
527		};
528
529		static const OSSL_PARAM settable_ctx_params_no_digest[] = {
530		OSSL_PARAM_uint(OSSL_SIGNATURE_PARAM_KAT, NULL),
531		OSSL_PARAM_END
532		};
533
534		static const OSSL_PARAM ecdsa_settable_ctx_params(void vctx,
535		ossl_unused void *provctx)
536		{
537		PROV_ECDSA_CTX ctx = (PROV_ECDSA_CTX )vctx;
538
539		if (ctx != NULL && !ctx->flag_allow_md)
540		return settable_ctx_params_no_digest;
541		return settable_ctx_params;
542		}
543
544		static int ecdsa_get_ctx_md_params(void vctx, OSSL_PARAM params)
545	0	{
546	0	PROV_ECDSA_CTX ctx = (PROV_ECDSA_CTX )vctx;
547
548	0	if (ctx->mdctx == NULL)
549	0	return 0;
550
551	0	return EVP_MD_CTX_get_params(ctx->mdctx, params);
552	0	}
553
554		static const OSSL_PARAM ecdsa_gettable_ctx_md_params(void vctx)
555	0	{
556	0	PROV_ECDSA_CTX ctx = (PROV_ECDSA_CTX )vctx;
557
558	0	if (ctx->md == NULL)
559	0	return 0;
560
561	0	return EVP_MD_gettable_ctx_params(ctx->md);
562	0	}
563
564		static int ecdsa_set_ctx_md_params(void *vctx, const OSSL_PARAM params[])
565	0	{
566	0	PROV_ECDSA_CTX ctx = (PROV_ECDSA_CTX )vctx;
567
568	0	if (ctx->mdctx == NULL)
569	0	return 0;
570
571	0	return EVP_MD_CTX_set_params(ctx->mdctx, params);
572	0	}
573
574		static const OSSL_PARAM ecdsa_settable_ctx_md_params(void vctx)
575	0	{
576	0	PROV_ECDSA_CTX ctx = (PROV_ECDSA_CTX )vctx;
577
578	0	if (ctx->md == NULL)
579	0	return 0;
580
581	0	return EVP_MD_settable_ctx_params(ctx->md);
582	0	}
583
584		const OSSL_DISPATCH ossl_ecdsa_signature_functions[] = {
585		{ OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))ecdsa_newctx },
586		{ OSSL_FUNC_SIGNATURE_SIGN_INIT, (void (*)(void))ecdsa_sign_init },
587		{ OSSL_FUNC_SIGNATURE_SIGN, (void (*)(void))ecdsa_sign },
588		{ OSSL_FUNC_SIGNATURE_VERIFY_INIT, (void (*)(void))ecdsa_verify_init },
589		{ OSSL_FUNC_SIGNATURE_VERIFY, (void (*)(void))ecdsa_verify },
590		{ OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT,
591		(void (*)(void))ecdsa_digest_sign_init },
592		{ OSSL_FUNC_SIGNATURE_DIGEST_SIGN_UPDATE,
593		(void (*)(void))ecdsa_digest_signverify_update },
594		{ OSSL_FUNC_SIGNATURE_DIGEST_SIGN_FINAL,
595		(void (*)(void))ecdsa_digest_sign_final },
596		{ OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_INIT,
597		(void (*)(void))ecdsa_digest_verify_init },
598		{ OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_UPDATE,
599		(void (*)(void))ecdsa_digest_signverify_update },
600		{ OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_FINAL,
601		(void (*)(void))ecdsa_digest_verify_final },
602		{ OSSL_FUNC_SIGNATURE_FREECTX, (void (*)(void))ecdsa_freectx },
603		{ OSSL_FUNC_SIGNATURE_DUPCTX, (void (*)(void))ecdsa_dupctx },
604		{ OSSL_FUNC_SIGNATURE_GET_CTX_PARAMS, (void (*)(void))ecdsa_get_ctx_params },
605		{ OSSL_FUNC_SIGNATURE_GETTABLE_CTX_PARAMS,
606		(void (*)(void))ecdsa_gettable_ctx_params },
607		{ OSSL_FUNC_SIGNATURE_SET_CTX_PARAMS, (void (*)(void))ecdsa_set_ctx_params },
608		{ OSSL_FUNC_SIGNATURE_SETTABLE_CTX_PARAMS,
609		(void (*)(void))ecdsa_settable_ctx_params },
610		{ OSSL_FUNC_SIGNATURE_GET_CTX_MD_PARAMS,
611		(void (*)(void))ecdsa_get_ctx_md_params },
612		{ OSSL_FUNC_SIGNATURE_GETTABLE_CTX_MD_PARAMS,
613		(void (*)(void))ecdsa_gettable_ctx_md_params },
614		{ OSSL_FUNC_SIGNATURE_SET_CTX_MD_PARAMS,
615		(void (*)(void))ecdsa_set_ctx_md_params },
616		{ OSSL_FUNC_SIGNATURE_SETTABLE_CTX_MD_PARAMS,
617		(void (*)(void))ecdsa_settable_ctx_md_params },
618		{ 0, NULL }
619		};