/*

 * Copyright 2019-2024 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

 */

/*

 * DSA low level APIs are deprecated for public use, but still ok for

 * internal use.

 */

#include "internal/deprecated.h"

#include <string.h>

#include <openssl/crypto.h>

#include <openssl/core_dispatch.h>

#include <openssl/core_names.h>

#include <openssl/err.h>

#include <openssl/dsa.h>

#include <openssl/params.h>

#include <openssl/evp.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 "prov/der_dsa.h"

#include "crypto/dsa.h"

static OSSL_FUNC_signature_newctx_fn dsa_newctx;

static OSSL_FUNC_signature_sign_init_fn dsa_sign_init;

static OSSL_FUNC_signature_verify_init_fn dsa_verify_init;

static OSSL_FUNC_signature_sign_fn dsa_sign;

static OSSL_FUNC_signature_sign_message_update_fn dsa_signverify_message_update;

static OSSL_FUNC_signature_sign_message_final_fn dsa_sign_message_final;

static OSSL_FUNC_signature_verify_fn dsa_verify;

static OSSL_FUNC_signature_verify_message_update_fn dsa_signverify_message_update;

static OSSL_FUNC_signature_verify_message_final_fn dsa_verify_message_final;

static OSSL_FUNC_signature_digest_sign_init_fn dsa_digest_sign_init;

static OSSL_FUNC_signature_digest_sign_update_fn dsa_digest_signverify_update;

static OSSL_FUNC_signature_digest_sign_final_fn dsa_digest_sign_final;

static OSSL_FUNC_signature_digest_verify_init_fn dsa_digest_verify_init;

static OSSL_FUNC_signature_digest_verify_update_fn dsa_digest_signverify_update;

static OSSL_FUNC_signature_digest_verify_final_fn dsa_digest_verify_final;

static OSSL_FUNC_signature_freectx_fn dsa_freectx;

static OSSL_FUNC_signature_dupctx_fn dsa_dupctx;

static OSSL_FUNC_signature_query_key_types_fn dsa_sigalg_query_key_types;

static OSSL_FUNC_signature_get_ctx_params_fn dsa_get_ctx_params;

static OSSL_FUNC_signature_gettable_ctx_params_fn dsa_gettable_ctx_params;

static OSSL_FUNC_signature_set_ctx_params_fn dsa_set_ctx_params;

static OSSL_FUNC_signature_settable_ctx_params_fn dsa_settable_ctx_params;

static OSSL_FUNC_signature_get_ctx_md_params_fn dsa_get_ctx_md_params;

static OSSL_FUNC_signature_gettable_ctx_md_params_fn dsa_gettable_ctx_md_params;

static OSSL_FUNC_signature_set_ctx_md_params_fn dsa_set_ctx_md_params;

static OSSL_FUNC_signature_settable_ctx_md_params_fn dsa_settable_ctx_md_params;

static OSSL_FUNC_signature_set_ctx_params_fn dsa_sigalg_set_ctx_params;

static OSSL_FUNC_signature_settable_ctx_params_fn dsa_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;

    DSA *dsa;

    /* |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;

    /* If this is set to 1 then the generated k is not random */

    unsigned int nonce_type;

    /* 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;

    /* Signature, for verification */

    unsigned char *sig;

    size_t siglen;

    OSSL_FIPS_IND_DECLARE

} PROV_DSA_CTX;

static size_t dsa_get_md_size(const PROV_DSA_CTX *pdsactx)

{

    int md_size;

    if (pdsactx->md != NULL) {

        md_size = EVP_MD_get_size(pdsactx->md);

        if (md_size <= 0)

            return 0;

        return (size_t)md_size;

    }

    return 0;

}

static void *dsa_newctx(void *provctx, const char *propq)

{

    PROV_DSA_CTX *pdsactx;

    if (!ossl_prov_is_running())

        return NULL;

    pdsactx = OPENSSL_zalloc(sizeof(PROV_DSA_CTX));

    if (pdsactx == NULL)

        return NULL;

    pdsactx->libctx = PROV_LIBCTX_OF(provctx);

    pdsactx->flag_allow_md = 1;

    OSSL_FIPS_IND_INIT(pdsactx)

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

        OPENSSL_free(pdsactx);

        pdsactx = NULL;

    }

    return pdsactx;

}

static int dsa_setup_md(PROV_DSA_CTX *ctx,

                        const char *mdname, const char *mdprops,

                        const char *desc)

{

    EVP_MD *md = NULL;

    if (mdprops == NULL)

        mdprops = ctx->propq;

    if (mdname != NULL) {

        WPACKET pkt;

        int md_nid;

        size_t mdname_len = strlen(mdname);

        unsigned char *aid = NULL;

        md = EVP_MD_fetch(ctx->libctx, mdname, mdprops);

        md_nid = ossl_digest_get_approved_nid(md);

        if (md == NULL) {

            ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,

                           "%s could not be fetched", mdname);

            goto err;

        }

        if (md_nid == NID_undef) {

            ERR_raise_data(ERR_LIB_PROV, PROV_R_DIGEST_NOT_ALLOWED,

                           "digest=%s", mdname);

            goto err;

        }

        if (mdname_len >= sizeof(ctx->mdname)) {

            ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,

                           "%s exceeds name buffer length", mdname);

            goto err;

        }

        /* 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);

        /*

         * We do not care about DER writing errors.

         * All it really means is that for some reason, there's no

         * AlgorithmIdentifier to be had, but the operation itself is

         * still valid, just as long as it's not used to construct

         * anything that needs an AlgorithmIdentifier.

         */

        ctx->aid_len = 0;

        if (WPACKET_init_der(&pkt, ctx->aid_buf, sizeof(ctx->aid_buf))

            && ossl_DER_w_algorithmIdentifier_DSA_with_MD(&pkt, -1, ctx->dsa,

                                                          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;

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

    }

    return 1;

 err:

    EVP_MD_free(md);

    return 0;

}

#ifdef FIPS_MODULE

static int dsa_sign_check_approved(PROV_DSA_CTX *ctx, int signing,

                                   const char *desc)

{

    /* DSA Signing is not approved in FIPS 140-3 */

    if (signing

        && !OSSL_FIPS_IND_ON_UNAPPROVED(ctx, OSSL_FIPS_IND_SETTABLE2,

                                        ctx->libctx, desc, "DSA",

                                        ossl_fips_config_dsa_sign_disallowed))

        return 0;

    return 1;

}

static int dsa_check_key(PROV_DSA_CTX *ctx, int sign, const char *desc)

{

    int approved = ossl_dsa_check_key(ctx->dsa, sign);

    if (!approved) {

        if (!OSSL_FIPS_IND_ON_UNAPPROVED(ctx, OSSL_FIPS_IND_SETTABLE0,

                                         ctx->libctx, desc, "DSA Key",

                                         ossl_fips_config_signature_digest_check)) {

            ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);

            return 0;

        }

    }

    return 1;

}

#endif

static int

dsa_signverify_init(void *vpdsactx, void *vdsa,

                    OSSL_FUNC_signature_set_ctx_params_fn *set_ctx_params,

                    const OSSL_PARAM params[], int operation,

                    const char *desc)

{

    PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;

    if (!ossl_prov_is_running()

            || pdsactx == NULL)

        return 0;

    if (vdsa == NULL && pdsactx->dsa == NULL) {

        ERR_raise(ERR_LIB_PROV, PROV_R_NO_KEY_SET);

        return 0;

    }

    if (vdsa != NULL) {

        if (!DSA_up_ref(vdsa))

            return 0;

        DSA_free(pdsactx->dsa);

        pdsactx->dsa = vdsa;

    }

    pdsactx->operation = operation;

    OSSL_FIPS_IND_SET_APPROVED(pdsactx)

    if (!set_ctx_params(pdsactx, params))

        return 0;

#ifdef FIPS_MODULE

    {

        int operation_is_sign

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

        if (!dsa_sign_check_approved(pdsactx, operation_is_sign, desc))

            return 0;

        if (!dsa_check_key(pdsactx, operation_is_sign, desc))

            return 0;

    }

#endif

    return 1;

}

static int dsa_sign_init(void *vpdsactx, void *vdsa, const OSSL_PARAM params[])

{

    return dsa_signverify_init(vpdsactx, vdsa, dsa_set_ctx_params, params,

                               EVP_PKEY_OP_SIGN, "DSA Sign Init");

}

/*

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

 * signing and signing the digest of a message, i.e. should be used with

 * implementations of the keytype related algorithms.

 */

static int dsa_sign_directly(void *vpdsactx,

                             unsigned char *sig, size_t *siglen, size_t sigsize,

                             const unsigned char *tbs, size_t tbslen)

{

    PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;

    int ret;

    unsigned int sltmp;

    size_t dsasize = DSA_size(pdsactx->dsa);

    size_t mdsize = dsa_get_md_size(pdsactx);

    if (!ossl_prov_is_running())

        return 0;

#ifdef FIPS_MODULE

    if (!dsa_sign_check_approved(pdsactx, 1, "Sign"))

        return 0;

#endif

    if (sig == NULL) {

        *siglen = dsasize;

        return 1;

    }

    if (sigsize < dsasize)

        return 0;

    if (mdsize != 0 && tbslen != mdsize)

        return 0;

    ret = ossl_dsa_sign_int(0, tbs, tbslen, sig, &sltmp, pdsactx->dsa,

                            pdsactx->nonce_type, pdsactx->mdname,

                            pdsactx->libctx, pdsactx->propq);

    if (ret <= 0)

        return 0;

    *siglen = sltmp;

    return 1;

}

static int dsa_signverify_message_update(void *vpdsactx,

                                         const unsigned char *data,

                                         size_t datalen)

{

    PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;

    if (pdsactx == NULL)

        return 0;

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

}

static int dsa_sign_message_final(void *vpdsactx, unsigned char *sig,

                                  size_t *siglen, size_t sigsize)

{

    PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;

    unsigned char digest[EVP_MAX_MD_SIZE];

    unsigned int dlen = 0;

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

        return 0;

    /*

     * If sig is NULL then we're just finding out the sig size. Other fields

     * are ignored. Defer to dsa_sign.

     */

    if (sig != NULL) {

        /*

         * When this function is used through dsa_digest_sign_final(),

         * there is the possibility that some externally provided digests

         * exceed EVP_MAX_MD_SIZE. We should probably handle that

         * somehow but that problem is much larger than just in DSA.

         */

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

            return 0;

    }

    return dsa_sign_directly(vpdsactx, sig, siglen, sigsize, digest, dlen);

}

/*

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

 * Otherwise, sign tbs directly.

 */

static int dsa_sign(void *vpdsactx, unsigned char *sig, size_t *siglen,

                    size_t sigsize, const unsigned char *tbs, size_t tbslen)

{

    PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;

    if (pdsactx->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 dsa_sign_message_final(pdsactx, sig, siglen, sigsize);

        if (dsa_signverify_message_update(pdsactx, tbs, tbslen) <= 0)

            return 0;

        return dsa_sign_message_final(pdsactx, sig, siglen, sigsize);

    }

    return dsa_sign_directly(pdsactx, sig, siglen, sigsize, tbs, tbslen);

}

static int dsa_verify_init(void *vpdsactx, void *vdsa,

                           const OSSL_PARAM params[])

{

    return dsa_signverify_init(vpdsactx, vdsa, dsa_set_ctx_params, params,

                               EVP_PKEY_OP_VERIFY, "DSA Verify Init");

}

static int dsa_verify_directly(void *vpdsactx,

                               const unsigned char *sig, size_t siglen,

                               const unsigned char *tbs, size_t tbslen)

{

    PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;

    size_t mdsize = dsa_get_md_size(pdsactx);

    if (!ossl_prov_is_running() || (mdsize != 0 && tbslen != mdsize))

        return 0;

    return DSA_verify(0, tbs, tbslen, sig, siglen, pdsactx->dsa);

}

static int dsa_verify_set_sig(void *vpdsactx,

                              const unsigned char *sig, size_t siglen)

{

    PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;

    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 dsa_sigalg_set_ctx_params(pdsactx, params);

}

static int dsa_verify_message_final(void *vpdsactx)

{

    PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;

    unsigned char digest[EVP_MAX_MD_SIZE];

    unsigned int dlen = 0;

    if (!ossl_prov_is_running())

        return 0;

    if (pdsactx == NULL || pdsactx->mdctx == NULL)

        return 0;

    /*

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

     * should not exceed the internal buffer size of EVP_MAX_MD_SIZE.

     */

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

        return 0;

    return dsa_verify_directly(vpdsactx, pdsactx->sig, pdsactx->siglen,

                               digest, dlen);

}

/*

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

 * Otherwise, verify tbs directly.

 */

static int dsa_verify(void *vpdsactx,

                      const unsigned char *sig, size_t siglen,

                      const unsigned char *tbs, size_t tbslen)

{

    PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;

    if (pdsactx->operation == EVP_PKEY_OP_VERIFYMSG) {

        if (dsa_verify_set_sig(pdsactx, sig, siglen) <= 0)

            return 0;

        if (dsa_signverify_message_update(pdsactx, tbs, tbslen) <= 0)

            return 0;

        return dsa_verify_message_final(pdsactx);

    }

    return dsa_verify_directly(pdsactx, sig, siglen, tbs, tbslen);

}

/* DigestSign/DigestVerify wrappers */

static int dsa_digest_signverify_init(void *vpdsactx, const char *mdname,

                                      void *vdsa, const OSSL_PARAM params[],

                                      int operation, const char *desc)

{

    PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;

    if (!ossl_prov_is_running())

        return 0;

    if (!dsa_signverify_init(vpdsactx, vdsa, dsa_set_ctx_params, params,

                             operation, desc))

        return 0;

    if (mdname != NULL

        /* was dsa_setup_md already called in dsa_signverify_init()? */

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

        && !dsa_setup_md(pdsactx, mdname, NULL, desc))

        return 0;

    pdsactx->flag_allow_md = 0;

    if (pdsactx->mdctx == NULL) {

        pdsactx->mdctx = EVP_MD_CTX_new();

        if (pdsactx->mdctx == NULL)

            goto error;

    }

    if (!EVP_DigestInit_ex2(pdsactx->mdctx, pdsactx->md, params))

        goto error;

    return 1;

 error:

    EVP_MD_CTX_free(pdsactx->mdctx);

    pdsactx->mdctx = NULL;

    return 0;

}

static int dsa_digest_sign_init(void *vpdsactx, const char *mdname,

                                void *vdsa, const OSSL_PARAM params[])

{

    return dsa_digest_signverify_init(vpdsactx, mdname, vdsa, params,

                                      EVP_PKEY_OP_SIGNMSG,

                                      "DSA Digest Sign Init");

}

static int dsa_digest_signverify_update(void *vpdsactx, const unsigned char *data,

                                        size_t datalen)

{

    PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;

    if (pdsactx == NULL)

        return 0;

    /* Sigalg implementations shouldn't do digest_sign */

    if (pdsactx->flag_sigalg)

        return 0;

    return dsa_signverify_message_update(vpdsactx, data, datalen);

}

static int dsa_digest_sign_final(void *vpdsactx, unsigned char *sig,

                                 size_t *siglen, size_t sigsize)

{

    PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;

    int ok = 0;

    if (pdsactx == NULL)

        return 0;

    /* Sigalg implementations shouldn't do digest_sign */

    if (pdsactx->flag_sigalg)

        return 0;

    ok = dsa_sign_message_final(pdsactx, sig, siglen, sigsize);

    pdsactx->flag_allow_md = 1;

    return ok;

}

static int dsa_digest_verify_init(void *vpdsactx, const char *mdname,

                                  void *vdsa, const OSSL_PARAM params[])

{

    return dsa_digest_signverify_init(vpdsactx, mdname, vdsa, params,

                                      EVP_PKEY_OP_VERIFYMSG,

                                      "DSA Digest Verify Init");

}

int dsa_digest_verify_final(void *vpdsactx, const unsigned char *sig,

                            size_t siglen)

{

    PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;

    int ok = 0;

    if (pdsactx == NULL)

        return 0;

    /* Sigalg implementations shouldn't do digest_verify */

    if (pdsactx->flag_sigalg)

        return 0;

    if (dsa_verify_set_sig(pdsactx, sig, siglen))

        ok = dsa_verify_message_final(vpdsactx);

    pdsactx->flag_allow_md = 1;

    return ok;

}

static void dsa_freectx(void *vpdsactx)

{

    PROV_DSA_CTX *ctx = (PROV_DSA_CTX *)vpdsactx;

    EVP_MD_CTX_free(ctx->mdctx);

    EVP_MD_free(ctx->md);

    OPENSSL_free(ctx->sig);

    OPENSSL_free(ctx->propq);

    DSA_free(ctx->dsa);

    OPENSSL_free(ctx);

}

static void *dsa_dupctx(void *vpdsactx)

{

    PROV_DSA_CTX *srcctx = (PROV_DSA_CTX *)vpdsactx;

    PROV_DSA_CTX *dstctx;

    if (!ossl_prov_is_running())

        return NULL;

    dstctx = OPENSSL_zalloc(sizeof(*srcctx));

    if (dstctx == NULL)

        return NULL;

    *dstctx = *srcctx;

    dstctx->dsa = NULL;

    dstctx->propq = NULL;

    if (srcctx->dsa != NULL && !DSA_up_ref(srcctx->dsa))

        goto err;

    dstctx->dsa = srcctx->dsa;

    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:

    dsa_freectx(dstctx);

    return NULL;

}

static int dsa_get_ctx_params(void *vpdsactx, OSSL_PARAM *params)

{

    PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;

    OSSL_PARAM *p;

    if (pdsactx == NULL)

        return 0;

    p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_ALGORITHM_ID);

    if (p != NULL

        && !OSSL_PARAM_set_octet_string(p,

                                        pdsactx->aid_len == 0 ? NULL : pdsactx->aid_buf,

                                        pdsactx->aid_len))

        return 0;

    p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_DIGEST);

    if (p != NULL && !OSSL_PARAM_set_utf8_string(p, pdsactx->mdname))

        return 0;

    p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_NONCE_TYPE);

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

        return 0;

    if (!OSSL_FIPS_IND_GET_CTX_PARAM(pdsactx, 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_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),

    OSSL_PARAM_uint(OSSL_SIGNATURE_PARAM_NONCE_TYPE, NULL),

    OSSL_FIPS_IND_GETTABLE_CTX_PARAM()

    OSSL_PARAM_END

};

static const OSSL_PARAM *dsa_gettable_ctx_params(ossl_unused void *ctx,

                                                 ossl_unused void *provctx)

{

    return known_gettable_ctx_params;

}

/**

 * @brief Setup common params for dsa_set_ctx_params and dsa_sigalg_set_ctx_params

 * The caller is responsible for checking |vpdsactx| is not NULL and |params|

 * is not empty.

 */

static int dsa_common_set_ctx_params(void *vpdsactx, const OSSL_PARAM params[])

{

    PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;

    const OSSL_PARAM *p;

    if (!OSSL_FIPS_IND_SET_CTX_PARAM(pdsactx, OSSL_FIPS_IND_SETTABLE0, params,

                                     OSSL_SIGNATURE_PARAM_FIPS_KEY_CHECK))

        return 0;

    if (!OSSL_FIPS_IND_SET_CTX_PARAM(pdsactx, OSSL_FIPS_IND_SETTABLE1, params,

                                     OSSL_SIGNATURE_PARAM_FIPS_DIGEST_CHECK))

        return 0;

    if (!OSSL_FIPS_IND_SET_CTX_PARAM(pdsactx, OSSL_FIPS_IND_SETTABLE2, params,

                                     OSSL_SIGNATURE_PARAM_FIPS_SIGN_CHECK))

        return 0;

    p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_NONCE_TYPE);

    if (p != NULL

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

        return 0;

    return 1;

}

#define DSA_COMMON_SETTABLE_CTX_PARAMS                                        \

    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_FIPS_IND_SETTABLE_CTX_PARAM(OSSL_SIGNATURE_PARAM_FIPS_SIGN_CHECK)    \

    OSSL_PARAM_END

static int dsa_set_ctx_params(void *vpdsactx, const OSSL_PARAM params[])

{

    PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;

    const OSSL_PARAM *p;

    int ret;

    if (pdsactx == NULL)

        return 0;

    if (ossl_param_is_empty(params))

        return 1;

    if ((ret = dsa_common_set_ctx_params(pdsactx, 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 (!dsa_setup_md(pdsactx, mdname, mdprops, "DSA Set Ctx"))

            return 0;

    }

    return 1;

}

static const OSSL_PARAM settable_ctx_params[] = {

    OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),

    OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PROPERTIES, NULL, 0),

    DSA_COMMON_SETTABLE_CTX_PARAMS

};

static const OSSL_PARAM settable_ctx_params_no_digest[] = {

    OSSL_PARAM_END

};

static const OSSL_PARAM *dsa_settable_ctx_params(void *vpdsactx,

                                                 ossl_unused void *provctx)

{

    PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;

    if (pdsactx != NULL && !pdsactx->flag_allow_md)

        return settable_ctx_params_no_digest;

    return settable_ctx_params;

}

static int dsa_get_ctx_md_params(void *vpdsactx, OSSL_PARAM *params)

{

    PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;

    if (pdsactx->mdctx == NULL)

        return 0;

    return EVP_MD_CTX_get_params(pdsactx->mdctx, params);

}

static const OSSL_PARAM *dsa_gettable_ctx_md_params(void *vpdsactx)

{

    PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;

    if (pdsactx->md == NULL)

        return 0;

    return EVP_MD_gettable_ctx_params(pdsactx->md);

}

static int dsa_set_ctx_md_params(void *vpdsactx, const OSSL_PARAM params[])

{

    PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;

    if (pdsactx->mdctx == NULL)

        return 0;

    return EVP_MD_CTX_set_params(pdsactx->mdctx, params);

}

static const OSSL_PARAM *dsa_settable_ctx_md_params(void *vpdsactx)

{

    PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;

    if (pdsactx->md == NULL)

        return 0;

    return EVP_MD_settable_ctx_params(pdsactx->md);

}

const OSSL_DISPATCH ossl_dsa_signature_functions[] = {

    { OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))dsa_newctx },

    { OSSL_FUNC_SIGNATURE_SIGN_INIT, (void (*)(void))dsa_sign_init },

    { OSSL_FUNC_SIGNATURE_SIGN, (void (*)(void))dsa_sign },

    { OSSL_FUNC_SIGNATURE_VERIFY_INIT, (void (*)(void))dsa_verify_init },

    { OSSL_FUNC_SIGNATURE_VERIFY, (void (*)(void))dsa_verify },

    { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT,

      (void (*)(void))dsa_digest_sign_init },

    { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_UPDATE,

      (void (*)(void))dsa_digest_signverify_update },

    { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_FINAL,

      (void (*)(void))dsa_digest_sign_final },

    { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_INIT,

      (void (*)(void))dsa_digest_verify_init },

    { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_UPDATE,

      (void (*)(void))dsa_digest_signverify_update },

    { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_FINAL,

      (void (*)(void))dsa_digest_verify_final },

    { OSSL_FUNC_SIGNATURE_FREECTX, (void (*)(void))dsa_freectx },

    { OSSL_FUNC_SIGNATURE_DUPCTX, (void (*)(void))dsa_dupctx },

    { OSSL_FUNC_SIGNATURE_GET_CTX_PARAMS, (void (*)(void))dsa_get_ctx_params },

    { OSSL_FUNC_SIGNATURE_GETTABLE_CTX_PARAMS,

      (void (*)(void))dsa_gettable_ctx_params },

    { OSSL_FUNC_SIGNATURE_SET_CTX_PARAMS, (void (*)(void))dsa_set_ctx_params },

    { OSSL_FUNC_SIGNATURE_SETTABLE_CTX_PARAMS,

      (void (*)(void))dsa_settable_ctx_params },

    { OSSL_FUNC_SIGNATURE_GET_CTX_MD_PARAMS,

      (void (*)(void))dsa_get_ctx_md_params },

    { OSSL_FUNC_SIGNATURE_GETTABLE_CTX_MD_PARAMS,

      (void (*)(void))dsa_gettable_ctx_md_params },

    { OSSL_FUNC_SIGNATURE_SET_CTX_MD_PARAMS,

      (void (*)(void))dsa_set_ctx_md_params },

    { OSSL_FUNC_SIGNATURE_SETTABLE_CTX_MD_PARAMS,

      (void (*)(void))dsa_settable_ctx_md_params },

    OSSL_DISPATCH_END

};

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

/*

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

 * are pretty much hard coded.

 */

static OSSL_FUNC_signature_query_key_types_fn dsa_sigalg_query_key_types;

static OSSL_FUNC_signature_settable_ctx_params_fn dsa_sigalg_settable_ctx_params;

static OSSL_FUNC_signature_set_ctx_params_fn dsa_sigalg_set_ctx_params;

/*

 * dsa_sigalg_signverify_init() is almost like dsa_digest_signverify_init(),

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

 */

static int dsa_sigalg_signverify_init(void *vpdsactx, void *vdsa,

                                      OSSL_FUNC_signature_set_ctx_params_fn *set_ctx_params,

                                      const OSSL_PARAM params[],

                                      const char *mdname,

                                      int operation, const char *desc)

{

    PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;

    if (!ossl_prov_is_running())

        return 0;

    if (!dsa_signverify_init(vpdsactx, vdsa, set_ctx_params, params, operation,

                             desc))

        return 0;

    if (!dsa_setup_md(pdsactx, mdname, NULL, desc))

        return 0;

    pdsactx->flag_sigalg = 1;

    pdsactx->flag_allow_md = 0;

    if (pdsactx->mdctx == NULL) {

        pdsactx->mdctx = EVP_MD_CTX_new();

        if (pdsactx->mdctx == NULL)

            goto error;

    }

    if (!EVP_DigestInit_ex2(pdsactx->mdctx, pdsactx->md, params))

        goto error;

    return 1;

 error:

    EVP_MD_CTX_free(pdsactx->mdctx);

    pdsactx->mdctx = NULL;

    return 0;

}

static const char **dsa_sigalg_query_key_types(void)

{

    static const char *keytypes[] = { "DSA", NULL };