/*

 * Copyright 2020-2024 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 "internal/deterministic_nonce.h"

#include "prov/providercommon.h"

#include "prov/implementations.h"

#include "prov/provider_ctx.h"

#include "prov/securitycheck.h"

#include "prov/der_ec.h"

#include "crypto/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_sign_message_update_fn ecdsa_signverify_message_update;

static OSSL_FUNC_signature_sign_message_final_fn ecdsa_sign_message_final;

static OSSL_FUNC_signature_verify_fn ecdsa_verify;

static OSSL_FUNC_signature_verify_message_update_fn ecdsa_signverify_message_update;

static OSSL_FUNC_signature_verify_message_final_fn ecdsa_verify_message_final;

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_query_key_types_fn ecdsa_sigalg_query_key_types;

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;

static OSSL_FUNC_signature_set_ctx_params_fn ecdsa_sigalg_set_ctx_params;

static OSSL_FUNC_signature_settable_ctx_params_fn ecdsa_sigalg_settable_ctx_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;

    /* |operation| reuses EVP's operation bitfield */

    int operation;

    /*

     * Flag to determine if a full sigalg is run (1) or if a composable

     * signature algorithm is run (0).

     *

     * When a full sigalg is run (1), this currently affects the following

     * other flags, which are to remain untouched after their initialization:

     *

     * - flag_allow_md (initialized to 0)

     */

    unsigned int flag_sigalg : 1;

    /*

     * 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];

    size_t  aid_len;

    /* main digest */

    char mdname[OSSL_MAX_NAME_SIZE];

    EVP_MD *md;

    EVP_MD_CTX *mdctx;

    size_t mdsize;

    /* Signature, for verification */

    unsigned char *sig;

    size_t siglen;

    /*

     * 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

#ifdef FIPS_MODULE

    /*

     * FIPS 140-3 IG 2.4.B mandates that verification based on a digest of a

     * message is not permitted.  However, signing based on a digest is still

     * permitted.

     */

    int verify_message;

#endif

    /* If this is set then the generated k is not random */

    unsigned int nonce_type;

    OSSL_FIPS_IND_DECLARE

} 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;

    OSSL_FIPS_IND_INIT(ctx)

    ctx->flag_allow_md = 1;

#ifdef FIPS_MODULE

    ctx->verify_message = 1;

#endif

    ctx->libctx = PROV_LIBCTX_OF(provctx);

    if (propq != NULL && (ctx->propq = OPENSSL_strdup(propq)) == NULL) {

        OPENSSL_free(ctx);

        ctx = NULL;

    }

    return ctx;

}

static int ecdsa_setup_md(PROV_ECDSA_CTX *ctx,

                          const char *mdname, const char *mdprops,

                          const char *desc)

{

    EVP_MD *md = NULL;

    size_t mdname_len;

    int md_nid, md_size;

    WPACKET pkt;

    unsigned char *aid = NULL;

    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;

    }

    md_size = EVP_MD_get_size(md);

    if (md_size <= 0) {

        ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,

                       "%s has invalid md size %d", mdname, md_size);

        goto err;

    }

    md_nid = ossl_digest_get_approved_nid(md);

#ifdef FIPS_MODULE

    if (md_nid == NID_undef) {

        ERR_raise_data(ERR_LIB_PROV, PROV_R_DIGEST_NOT_ALLOWED,

                       "digest=%s", mdname);

        goto err;

    }

#endif

    /* XOF digests don't work */

    if (EVP_MD_xof(md)) {

        ERR_raise(ERR_LIB_PROV, PROV_R_XOF_DIGESTS_NOT_ALLOWED);

        goto err;

    }

#ifdef FIPS_MODULE

    {

        int sha1_allowed

            = ((ctx->operation

                & (EVP_PKEY_OP_SIGN | EVP_PKEY_OP_SIGNMSG)) == 0);

        if (!ossl_fips_ind_digest_sign_check(OSSL_FIPS_IND_GET(ctx),

                                             OSSL_FIPS_IND_SETTABLE1,

                                             ctx->libctx,

                                             md_nid, sha1_allowed, desc,

                                             ossl_fips_config_signature_digest_check))

            goto err;

    }

#endif

    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);

            goto err;

        }

        EVP_MD_free(md);

        return 1;

    }

    EVP_MD_CTX_free(ctx->mdctx);

    EVP_MD_free(ctx->md);

    ctx->aid_len = 0;

#ifndef FIPS_MODULE

    if (md_nid != NID_undef) {

#else

    {

#endif

        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);

            aid = WPACKET_get_curr(&pkt);

        }

        WPACKET_cleanup(&pkt);

        if (aid != NULL && ctx->aid_len != 0)

            memmove(ctx->aid_buf, aid, ctx->aid_len);

    }

    ctx->mdctx = NULL;

    ctx->md = md;

    ctx->mdsize = (size_t)md_size;

    OPENSSL_strlcpy(ctx->mdname, mdname, sizeof(ctx->mdname));

    return 1;

 err:

    EVP_MD_free(md);

    return 0;

}

static int

ecdsa_signverify_init(PROV_ECDSA_CTX *ctx, void *ec,

                      OSSL_FUNC_signature_set_ctx_params_fn *set_ctx_params,

                      const OSSL_PARAM params[], int operation,

                      const char *desc)

{

    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 (!EC_KEY_up_ref(ec))

            return 0;

        EC_KEY_free(ctx->ec);

        ctx->ec = ec;

    }

    ctx->operation = operation;

    OSSL_FIPS_IND_SET_APPROVED(ctx)

    if (!set_ctx_params(ctx, params))

        return 0;

#ifdef FIPS_MODULE

    if (!ossl_fips_ind_ec_key_check(OSSL_FIPS_IND_GET(ctx),

                                    OSSL_FIPS_IND_SETTABLE0, ctx->libctx,

                                    EC_KEY_get0_group(ctx->ec), desc,

                                    (operation & (EVP_PKEY_OP_SIGN

                                                  | EVP_PKEY_OP_SIGNMSG)) != 0))

        return 0;

#endif

    return 1;

}

static int ecdsa_sign_init(void *vctx, void *ec, const OSSL_PARAM params[])

{

    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;

#ifdef FIPS_MODULE

    ctx->verify_message = 1;

#endif

    return ecdsa_signverify_init(ctx, ec, ecdsa_set_ctx_params, params,

                                 EVP_PKEY_OP_SIGN, "ECDSA Sign Init");

}

/*

 * Sign tbs without digesting it first.  This is suitable for "primitive"

 * signing and signing the digest of a message.

 */

static int ecdsa_sign_directly(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;

    if (ctx->nonce_type != 0) {

        const char *mdname = NULL;

        if (ctx->mdname[0] != '\0')

            mdname = ctx->mdname;

        ret = ossl_ecdsa_deterministic_sign(tbs, tbslen, sig, &sltmp,

                                            ctx->ec, ctx->nonce_type,

                                            mdname,

                                            ctx->libctx, ctx->propq);

    } else {

        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_signverify_message_update(void *vctx,

                                         const unsigned char *data,

                                         size_t datalen)

{

    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;

    if (ctx == NULL)

        return 0;

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

}

static int ecdsa_sign_message_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)

        return 0;

    if (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;

    return ecdsa_sign_directly(vctx, sig, siglen, sigsize, digest, dlen);

}

/*

 * If signing a message, digest tbs and sign the result.

 * Otherwise, sign tbs directly.

 */

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;

    if (ctx->operation == EVP_PKEY_OP_SIGNMSG) {

        /*

         * If |sig| is NULL, the caller is only looking for the sig length.

         * DO NOT update the input in this case.

         */

        if (sig == NULL)

            return ecdsa_sign_message_final(ctx, sig, siglen, sigsize);

        if (ecdsa_signverify_message_update(ctx, tbs, tbslen) <= 0)

            return 0;

        return ecdsa_sign_message_final(ctx, sig, siglen, sigsize);

    }

    return ecdsa_sign_directly(ctx, sig, siglen, sigsize, tbs, tbslen);

}

static int ecdsa_verify_init(void *vctx, void *ec, const OSSL_PARAM params[])

{

    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;

#ifdef FIPS_MODULE

    ctx->verify_message = 0;

#endif

    return ecdsa_signverify_init(ctx, ec, ecdsa_set_ctx_params, params,

                                 EVP_PKEY_OP_VERIFY, "ECDSA Verify Init");

}

static int ecdsa_verify_directly(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_verify_set_sig(void *vctx,

                                const unsigned char *sig, size_t siglen)

{

    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;

    OSSL_PARAM params[2];

    params[0] =

        OSSL_PARAM_construct_octet_string(OSSL_SIGNATURE_PARAM_SIGNATURE,

                                          (unsigned char *)sig, siglen);

    params[1] = OSSL_PARAM_construct_end();

    return ecdsa_sigalg_set_ctx_params(ctx, params);

}

static int ecdsa_verify_message_final(void *vctx)

{

    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;

    /*

     * The digests used here are all known (see ecdsa_get_md_nid()), so they

     * should not exceed the internal buffer size of EVP_MAX_MD_SIZE.

     */

    if (!EVP_DigestFinal_ex(ctx->mdctx, digest, &dlen))

        return 0;

    return ecdsa_verify_directly(vctx, ctx->sig, ctx->siglen,

                               digest, dlen);

}

/*

 * If verifying a message, digest tbs and verify the result.

 * Otherwise, verify tbs directly.

 */

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->operation == EVP_PKEY_OP_VERIFYMSG) {

        if (ecdsa_verify_set_sig(ctx, sig, siglen) <= 0)

            return 0;

        if (ecdsa_signverify_message_update(ctx, tbs, tbslen) <= 0)

            return 0;

        return ecdsa_verify_message_final(ctx);

    }

    return ecdsa_verify_directly(ctx, sig, siglen, tbs, tbslen);

}

/* DigestSign/DigestVerify wrappers */

static int ecdsa_digest_signverify_init(void *vctx, const char *mdname,

                                        void *ec, const OSSL_PARAM params[],

                                        int operation, const char *desc)

{

    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;

    if (!ossl_prov_is_running())

        return 0;

#ifdef FIPS_MODULE

    ctx->verify_message = 1;

#endif

    if (!ecdsa_signverify_init(vctx, ec, ecdsa_set_ctx_params, params,

                               operation, desc))

        return 0;

    if (mdname != NULL

        /* was ecdsa_setup_md already called in ecdsa_signverify_init()? */

        && (mdname[0] == '\0' || OPENSSL_strcasecmp(ctx->mdname, mdname) != 0)

        && !ecdsa_setup_md(ctx, mdname, NULL, desc))

        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_SIGNMSG,

                                        "ECDSA Digest Sign Init");

}

static 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;

    /* Sigalg implementations shouldn't do digest_sign */

    if (ctx->flag_sigalg)

        return 0;

    return ecdsa_signverify_message_update(vctx, 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;

    int ok = 0;

    if (ctx == NULL)

        return 0;

    /* Sigalg implementations shouldn't do digest_sign */

    if (ctx->flag_sigalg)

        return 0;

    ok = ecdsa_sign_message_final(ctx, sig, siglen, sigsize);

    ctx->flag_allow_md = 1;

    return ok;

}

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_VERIFYMSG,

                                        "ECDSA Digest Verify Init");

}

int ecdsa_digest_verify_final(void *vctx, const unsigned char *sig,

                              size_t siglen)

{

    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;

    int ok = 0;

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

        return 0;

    /* Sigalg implementations shouldn't do digest_verify */

    if (ctx->flag_sigalg)

        return 0;

    if (ecdsa_verify_set_sig(ctx, sig, siglen))

        ok = ecdsa_verify_message_final(ctx);

    ctx->flag_allow_md = 1;

    return ok;

}

static void ecdsa_freectx(void *vctx)

{

    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;

    EVP_MD_CTX_free(ctx->mdctx);

    EVP_MD_free(ctx->md);

    OPENSSL_free(ctx->propq);

    OPENSSL_free(ctx->sig);

    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->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_len == 0 ? NULL : ctx->aid_buf,

                                                  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;

    p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_NONCE_TYPE);

    if (p != NULL && !OSSL_PARAM_set_uint(p, ctx->nonce_type))

        return 0;

#ifdef FIPS_MODULE

    p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_FIPS_VERIFY_MESSAGE);

    if (p != NULL && !OSSL_PARAM_set_uint(p, ctx->verify_message))

        return 0;

#endif

    if (!OSSL_FIPS_IND_GET_CTX_PARAM(ctx, params))

        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_uint(OSSL_SIGNATURE_PARAM_NONCE_TYPE, NULL),

#ifdef FIPS_MODULE

    OSSL_PARAM_uint(OSSL_SIGNATURE_PARAM_FIPS_VERIFY_MESSAGE, NULL),

#endif

    OSSL_FIPS_IND_GETTABLE_CTX_PARAM()

    OSSL_PARAM_END

};

static const OSSL_PARAM *ecdsa_gettable_ctx_params(ossl_unused void *vctx,

                                                   ossl_unused void *provctx)

{

    return known_gettable_ctx_params;

}

/**

 * @brief Set up common params for ecdsa_set_ctx_params and

 * ecdsa_sigalg_set_ctx_params. The caller is responsible for checking |vctx| is

 * not NULL and |params| is not empty.

 */

static int ecdsa_common_set_ctx_params(void *vctx, const OSSL_PARAM params[])

{

    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;

    const OSSL_PARAM *p;

    if (!OSSL_FIPS_IND_SET_CTX_PARAM(ctx, OSSL_FIPS_IND_SETTABLE0, params,

                                     OSSL_SIGNATURE_PARAM_FIPS_KEY_CHECK))

        return 0;

    if (!OSSL_FIPS_IND_SET_CTX_PARAM(ctx, OSSL_FIPS_IND_SETTABLE1, params,

                                     OSSL_SIGNATURE_PARAM_FIPS_DIGEST_CHECK))

        return 0;

#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_NONCE_TYPE);

    if (p != NULL

        && !OSSL_PARAM_get_uint(p, &ctx->nonce_type))

        return 0;

    return 1;

}

#define ECDSA_COMMON_SETTABLE_CTX_PARAMS                                      \

    OSSL_PARAM_uint(OSSL_SIGNATURE_PARAM_KAT, NULL),                          \

    OSSL_PARAM_uint(OSSL_SIGNATURE_PARAM_NONCE_TYPE, NULL),                   \

    OSSL_FIPS_IND_SETTABLE_CTX_PARAM(OSSL_SIGNATURE_PARAM_FIPS_KEY_CHECK)     \

    OSSL_FIPS_IND_SETTABLE_CTX_PARAM(OSSL_SIGNATURE_PARAM_FIPS_DIGEST_CHECK)  \

    OSSL_PARAM_END

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;

    int ret;

    if (ctx == NULL)

        return 0;

    if (ossl_param_is_empty(params))

        return 1;

    if ((ret = ecdsa_common_set_ctx_params(ctx, params)) <= 0)

        return ret;

    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, "ECDSA Set Ctx"))

            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),

    ECDSA_COMMON_SETTABLE_CTX_PARAMS

};

static const OSSL_PARAM *ecdsa_settable_ctx_params(void *vctx,

                                                   ossl_unused void *provctx)

{

    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 },

    OSSL_DISPATCH_END

};

/* ------------------------------------------------------------------ */

/*

 * So called sigalgs (composite ECDSA+hash) implemented below.  They

 * are pretty much hard coded.

 */

static OSSL_FUNC_signature_query_key_types_fn ecdsa_sigalg_query_key_types;

static OSSL_FUNC_signature_settable_ctx_params_fn ecdsa_sigalg_settable_ctx_params;

static OSSL_FUNC_signature_set_ctx_params_fn ecdsa_sigalg_set_ctx_params;

/*

 * ecdsa_sigalg_signverify_init() is almost like ecdsa_digest_signverify_init(),

 * just doesn't allow fetching an MD from whatever the user chooses.

 */

static int ecdsa_sigalg_signverify_init(void *vctx, void *vec,

                                      OSSL_FUNC_signature_set_ctx_params_fn *set_ctx_params,

                                      const OSSL_PARAM params[],

                                      const char *mdname,

                                      int operation, const char *desc)

{

    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;

    if (!ossl_prov_is_running())

        return 0;

    if (!ecdsa_signverify_init(vctx, vec, set_ctx_params, params, operation,

                               desc))

        return 0;

    if (!ecdsa_setup_md(ctx, mdname, NULL, desc))

        return 0;