/src/openssl31/providers/implementations/signature/dsa_sig.c

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/*
 * Copyright 2019-2022 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 "crypto/dsa.h"
#include "prov/der_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_verify_fn dsa_verify;
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_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;

/*
 * 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;

    /*
     * 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;

    char mdname[OSSL_MAX_NAME_SIZE];

    /* The Algorithm Identifier of the combined signature algorithm */
    unsigned char aid_buf[OSSL_MAX_ALGORITHM_ID_SIZE];
    unsigned char *aid;
    size_t  aid_len;

    /* main digest */
    EVP_MD *md;
    EVP_MD_CTX *mdctx;
    int operation;
} PROV_DSA_CTX;


static size_t dsa_get_md_size(const PROV_DSA_CTX *pdsactx)
{
    if (pdsactx->md != NULL)
        return EVP_MD_get_size(pdsactx->md);
    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;
    if (propq != NULL && (pdsactx->propq = OPENSSL_strdup(propq)) == NULL) {
        OPENSSL_free(pdsactx);
        pdsactx = NULL;
        ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
    }
    return pdsactx;
}

static int dsa_setup_md(PROV_DSA_CTX *ctx,
                        const char *mdname, const char *mdprops)
{
    if (mdprops == NULL)
        mdprops = ctx->propq;

    if (mdname != NULL) {
        int sha1_allowed = (ctx->operation != EVP_PKEY_OP_SIGN);
        WPACKET pkt;
        EVP_MD *md = EVP_MD_fetch(ctx->libctx, mdname, mdprops);
        int md_nid = ossl_digest_get_approved_nid_with_sha1(ctx->libctx, md,
                                                            sha1_allowed);
        size_t mdname_len = strlen(mdname);

        if (md == NULL || md_nid < 0) {
            if (md == NULL)
                ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
                               "%s could not be fetched", mdname);
            if (md_nid < 0)
                ERR_raise_data(ERR_LIB_PROV, PROV_R_DIGEST_NOT_ALLOWED,
                               "digest=%s", mdname);
            if (mdname_len >= sizeof(ctx->mdname))
                ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
                               "%s exceeds name buffer length", 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);

        /*
         * 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);
            ctx->aid = WPACKET_get_curr(&pkt);
        }
        WPACKET_cleanup(&pkt);

        ctx->mdctx = NULL;
        ctx->md = md;
        OPENSSL_strlcpy(ctx->mdname, mdname, sizeof(ctx->mdname));
    }
    return 1;
}

static int dsa_signverify_init(void *vpdsactx, void *vdsa,
                               const OSSL_PARAM params[], int operation)
{
    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 (!ossl_dsa_check_key(pdsactx->libctx, vdsa,
                                operation == EVP_PKEY_OP_SIGN)) {
            ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
            return 0;
        }
        if (!DSA_up_ref(vdsa))
            return 0;
        DSA_free(pdsactx->dsa);
        pdsactx->dsa = vdsa;
    }

    pdsactx->operation = operation;

    if (!dsa_set_ctx_params(pdsactx, params))
        return 0;

    return 1;
}

static int dsa_sign_init(void *vpdsactx, void *vdsa, const OSSL_PARAM params[])
{
    return dsa_signverify_init(vpdsactx, vdsa, params, EVP_PKEY_OP_SIGN);
}

static int dsa_verify_init(void *vpdsactx, void *vdsa,
                           const OSSL_PARAM params[])
{
    return dsa_signverify_init(vpdsactx, vdsa, params, EVP_PKEY_OP_VERIFY);
}

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;
    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;

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

    if (sigsize < (size_t)dsasize)
        return 0;

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

    ret = ossl_dsa_sign_int(0, tbs, tbslen, sig, &sltmp, pdsactx->dsa);
    if (ret <= 0)
        return 0;

    *siglen = sltmp;
    return 1;
}

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;
    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_digest_signverify_init(void *vpdsactx, const char *mdname,
                                      void *vdsa, const OSSL_PARAM params[],
                                      int operation)
{
    PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;

    if (!ossl_prov_is_running())
        return 0;

    if (!dsa_signverify_init(vpdsactx, vdsa, params, operation))
        return 0;

    if (!dsa_setup_md(pdsactx, mdname, NULL))
        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_SIGN);
}

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_VERIFY);
}

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 || pdsactx->mdctx == NULL)
        return 0;

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

int dsa_digest_sign_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) {
        /*
         * 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;
    }

    pdsactx->flag_allow_md = 1;

    return dsa_sign(vpdsactx, sig, siglen, sigsize, digest, (size_t)dlen);
}


int dsa_digest_verify_final(void *vpdsactx, const unsigned char *sig,
                            size_t siglen)
{
    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;

    /*
     * 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;

    pdsactx->flag_allow_md = 1;

    return dsa_verify(vpdsactx, sig, siglen, digest, (size_t)dlen);
}

static void dsa_freectx(void *vpdsactx)
{
    PROV_DSA_CTX *ctx = (PROV_DSA_CTX *)vpdsactx;

    OPENSSL_free(ctx->propq);
    EVP_MD_CTX_free(ctx->mdctx);
    EVP_MD_free(ctx->md);
    ctx->propq = NULL;
    ctx->mdctx = NULL;
    ctx->md = NULL;
    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->md = NULL;
    dstctx->mdctx = 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, 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;

    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_END
};

static const OSSL_PARAM *dsa_gettable_ctx_params(ossl_unused void *ctx,
                                                 ossl_unused void *provctx)
{
    return known_gettable_ctx_params;
}

static int dsa_set_ctx_params(void *vpdsactx, const OSSL_PARAM params[])
{
    PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
    const OSSL_PARAM *p;

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

    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))
            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),
    OSSL_PARAM_END
};

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 },
    { 0, NULL }
};

Coverage Report

Created: 2025-06-13 06:58

Line	Count	Source (jump to first uncovered line)
1		/*
2		* Copyright 2019-2022 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		* DSA 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>
17
18		#include <openssl/crypto.h>
19		#include <openssl/core_dispatch.h>
20		#include <openssl/core_names.h>
21		#include <openssl/err.h>
22		#include <openssl/dsa.h>
23		#include <openssl/params.h>
24		#include <openssl/evp.h>
25		#include <openssl/proverr.h>
26		#include "internal/nelem.h"
27		#include "internal/sizes.h"
28		#include "internal/cryptlib.h"
29		#include "prov/providercommon.h"
30		#include "prov/implementations.h"
31		#include "prov/provider_ctx.h"
32		#include "prov/securitycheck.h"
33		#include "crypto/dsa.h"
34		#include "prov/der_dsa.h"
35
36		static OSSL_FUNC_signature_newctx_fn dsa_newctx;
37		static OSSL_FUNC_signature_sign_init_fn dsa_sign_init;
38		static OSSL_FUNC_signature_verify_init_fn dsa_verify_init;
39		static OSSL_FUNC_signature_sign_fn dsa_sign;
40		static OSSL_FUNC_signature_verify_fn dsa_verify;
41		static OSSL_FUNC_signature_digest_sign_init_fn dsa_digest_sign_init;
42		static OSSL_FUNC_signature_digest_sign_update_fn dsa_digest_signverify_update;
43		static OSSL_FUNC_signature_digest_sign_final_fn dsa_digest_sign_final;
44		static OSSL_FUNC_signature_digest_verify_init_fn dsa_digest_verify_init;
45		static OSSL_FUNC_signature_digest_verify_update_fn dsa_digest_signverify_update;
46		static OSSL_FUNC_signature_digest_verify_final_fn dsa_digest_verify_final;
47		static OSSL_FUNC_signature_freectx_fn dsa_freectx;
48		static OSSL_FUNC_signature_dupctx_fn dsa_dupctx;
49		static OSSL_FUNC_signature_get_ctx_params_fn dsa_get_ctx_params;
50		static OSSL_FUNC_signature_gettable_ctx_params_fn dsa_gettable_ctx_params;
51		static OSSL_FUNC_signature_set_ctx_params_fn dsa_set_ctx_params;
52		static OSSL_FUNC_signature_settable_ctx_params_fn dsa_settable_ctx_params;
53		static OSSL_FUNC_signature_get_ctx_md_params_fn dsa_get_ctx_md_params;
54		static OSSL_FUNC_signature_gettable_ctx_md_params_fn dsa_gettable_ctx_md_params;
55		static OSSL_FUNC_signature_set_ctx_md_params_fn dsa_set_ctx_md_params;
56		static OSSL_FUNC_signature_settable_ctx_md_params_fn dsa_settable_ctx_md_params;
57
58		/*
59		* What's passed as an actual key is defined by the KEYMGMT interface.
60		* We happen to know that our KEYMGMT simply passes DSA structures, so
61		* we use that here too.
62		*/
63
64		typedef struct {
65		OSSL_LIB_CTX *libctx;
66		char *propq;
67		DSA *dsa;
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		char mdname[OSSL_MAX_NAME_SIZE];
78
79		/* The Algorithm Identifier of the combined signature algorithm */
80		unsigned char aid_buf[OSSL_MAX_ALGORITHM_ID_SIZE];
81		unsigned char *aid;
82		size_t aid_len;
83
84		/* main digest */
85		EVP_MD *md;
86		EVP_MD_CTX *mdctx;
87		int operation;
88		} PROV_DSA_CTX;
89
90
91		static size_t dsa_get_md_size(const PROV_DSA_CTX *pdsactx)
92	942	{
93	942	if (pdsactx->md != NULL)
94	942	return EVP_MD_get_size(pdsactx->md);
95	0	return 0;
96	942	}
97
98		static void dsa_newctx(void provctx, const char *propq)
99	1.28k	{
100	1.28k	PROV_DSA_CTX *pdsactx;
101
102	1.28k	if (!ossl_prov_is_running())
103	0	return NULL;
104
105	1.28k	pdsactx = OPENSSL_zalloc(sizeof(PROV_DSA_CTX));
106	1.28k	if (pdsactx == NULL)
107	0	return NULL;
108
109	1.28k	pdsactx->libctx = PROV_LIBCTX_OF(provctx);
110	1.28k	pdsactx->flag_allow_md = 1;
111	1.28k	if (propq != NULL && (pdsactx->propq = OPENSSL_strdup(propq)) == NULL) {
112	0	OPENSSL_free(pdsactx);
113	0	pdsactx = NULL;
114	0	ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
115	0	}
116	1.28k	return pdsactx;
117	1.28k	}
118
119		static int dsa_setup_md(PROV_DSA_CTX *ctx,
120		const char mdname, const char mdprops)
121	942	{
122	942	if (mdprops == NULL)
123	942	mdprops = ctx->propq;
124
125	942	if (mdname != NULL) {
126	942	int sha1_allowed = (ctx->operation != EVP_PKEY_OP_SIGN);
127	942	WPACKET pkt;
128	942	EVP_MD *md = EVP_MD_fetch(ctx->libctx, mdname, mdprops);
129	942	int md_nid = ossl_digest_get_approved_nid_with_sha1(ctx->libctx, md,
130	942	sha1_allowed);
131	942	size_t mdname_len = strlen(mdname);
132
133	942	if (md == NULL \|\| md_nid < 0) {
134	0	if (md == NULL)
135	0	ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
136	0	"%s could not be fetched", mdname);
137	0	if (md_nid < 0)
138	0	ERR_raise_data(ERR_LIB_PROV, PROV_R_DIGEST_NOT_ALLOWED,
139	0	"digest=%s", mdname);
140	0	if (mdname_len >= sizeof(ctx->mdname))
141	0	ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
142	0	"%s exceeds name buffer length", mdname);
143	0	EVP_MD_free(md);
144	0	return 0;
145	0	}
146
147	942	if (!ctx->flag_allow_md) {
148	0	if (ctx->mdname[0] != '\0' && !EVP_MD_is_a(md, ctx->mdname)) {
149	0	ERR_raise_data(ERR_LIB_PROV, PROV_R_DIGEST_NOT_ALLOWED,
150	0	"digest %s != %s", mdname, ctx->mdname);
151	0	EVP_MD_free(md);
152	0	return 0;
153	0	}
154	0	EVP_MD_free(md);
155	0	return 1;
156	0	}
157
158	942	EVP_MD_CTX_free(ctx->mdctx);
159	942	EVP_MD_free(ctx->md);
160
161		/*
162		* We do not care about DER writing errors.
163		* All it really means is that for some reason, there's no
164		* AlgorithmIdentifier to be had, but the operation itself is
165		* still valid, just as long as it's not used to construct
166		* anything that needs an AlgorithmIdentifier.
167		*/
168	942	ctx->aid_len = 0;
169	942	if (WPACKET_init_der(&pkt, ctx->aid_buf, sizeof(ctx->aid_buf))
170	942	&& ossl_DER_w_algorithmIdentifier_DSA_with_MD(&pkt, -1, ctx->dsa,
171	942	md_nid)
172	942	&& WPACKET_finish(&pkt)) {
173	942	WPACKET_get_total_written(&pkt, &ctx->aid_len);
174	942	ctx->aid = WPACKET_get_curr(&pkt);
175	942	}
176	942	WPACKET_cleanup(&pkt);
177
178	942	ctx->mdctx = NULL;
179	942	ctx->md = md;
180	942	OPENSSL_strlcpy(ctx->mdname, mdname, sizeof(ctx->mdname));
181	942	}
182	942	return 1;
183	942	}
184
185		static int dsa_signverify_init(void vpdsactx, void vdsa,
186		const OSSL_PARAM params[], int operation)
187	942	{
188	942	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
189
190	942	if (!ossl_prov_is_running()
191	942	\|\| pdsactx == NULL)
192	0	return 0;
193
194	942	if (vdsa == NULL && pdsactx->dsa == NULL) {
195	0	ERR_raise(ERR_LIB_PROV, PROV_R_NO_KEY_SET);
196	0	return 0;
197	0	}
198
199	942	if (vdsa != NULL) {
200	942	if (!ossl_dsa_check_key(pdsactx->libctx, vdsa,
201	942	operation == EVP_PKEY_OP_SIGN)) {
202	0	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
203	0	return 0;
204	0	}
205	942	if (!DSA_up_ref(vdsa))
206	0	return 0;
207	942	DSA_free(pdsactx->dsa);
208	942	pdsactx->dsa = vdsa;
209	942	}
210
211	942	pdsactx->operation = operation;
212
213	942	if (!dsa_set_ctx_params(pdsactx, params))
214	0	return 0;
215
216	942	return 1;
217	942	}
218
219		static int dsa_sign_init(void vpdsactx, void vdsa, const OSSL_PARAM params[])
220	0	{
221	0	return dsa_signverify_init(vpdsactx, vdsa, params, EVP_PKEY_OP_SIGN);
222	0	}
223
224		static int dsa_verify_init(void vpdsactx, void vdsa,
225		const OSSL_PARAM params[])
226	0	{
227	0	return dsa_signverify_init(vpdsactx, vdsa, params, EVP_PKEY_OP_VERIFY);
228	0	}
229
230		static int dsa_sign(void vpdsactx, unsigned char sig, size_t *siglen,
231		size_t sigsize, const unsigned char *tbs, size_t tbslen)
232	0	{
233	0	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
234	0	int ret;
235	0	unsigned int sltmp;
236	0	size_t dsasize = DSA_size(pdsactx->dsa);
237	0	size_t mdsize = dsa_get_md_size(pdsactx);
238
239	0	if (!ossl_prov_is_running())
240	0	return 0;
241
242	0	if (sig == NULL) {
243	0	*siglen = dsasize;
244	0	return 1;
245	0	}
246
247	0	if (sigsize < (size_t)dsasize)
248	0	return 0;
249
250	0	if (mdsize != 0 && tbslen != mdsize)
251	0	return 0;
252
253	0	ret = ossl_dsa_sign_int(0, tbs, tbslen, sig, &sltmp, pdsactx->dsa);
254	0	if (ret <= 0)
255	0	return 0;
256
257	0	*siglen = sltmp;
258	0	return 1;
259	0	}
260
261		static int dsa_verify(void vpdsactx, const unsigned char sig, size_t siglen,
262		const unsigned char *tbs, size_t tbslen)
263	942	{
264	942	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
265	942	size_t mdsize = dsa_get_md_size(pdsactx);
266
267	942	if (!ossl_prov_is_running() \|\| (mdsize != 0 && tbslen != mdsize))
268	0	return 0;
269
270	942	return DSA_verify(0, tbs, tbslen, sig, siglen, pdsactx->dsa);
271	942	}
272
273		static int dsa_digest_signverify_init(void vpdsactx, const char mdname,
274		void *vdsa, const OSSL_PARAM params[],
275		int operation)
276	942	{
277	942	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
278
279	942	if (!ossl_prov_is_running())
280	0	return 0;
281
282	942	if (!dsa_signverify_init(vpdsactx, vdsa, params, operation))
283	0	return 0;
284
285	942	if (!dsa_setup_md(pdsactx, mdname, NULL))
286	0	return 0;
287
288	942	pdsactx->flag_allow_md = 0;
289
290	942	if (pdsactx->mdctx == NULL) {
291	942	pdsactx->mdctx = EVP_MD_CTX_new();
292	942	if (pdsactx->mdctx == NULL)
293	0	goto error;
294	942	}
295
296	942	if (!EVP_DigestInit_ex2(pdsactx->mdctx, pdsactx->md, params))
297	0	goto error;
298
299	942	return 1;
300
301	0	error:
302	0	EVP_MD_CTX_free(pdsactx->mdctx);
303	0	pdsactx->mdctx = NULL;
304	0	return 0;
305	942	}
306
307		static int dsa_digest_sign_init(void vpdsactx, const char mdname,
308		void *vdsa, const OSSL_PARAM params[])
309	0	{
310	0	return dsa_digest_signverify_init(vpdsactx, mdname, vdsa, params,
311	0	EVP_PKEY_OP_SIGN);
312	0	}
313
314		static int dsa_digest_verify_init(void vpdsactx, const char mdname,
315		void *vdsa, const OSSL_PARAM params[])
316	1.28k	{
317	1.28k	return dsa_digest_signverify_init(vpdsactx, mdname, vdsa, params,
318	1.28k	EVP_PKEY_OP_VERIFY);
319	1.28k	}
320
321		int dsa_digest_signverify_update(void vpdsactx, const unsigned char data,
322		size_t datalen)
323	942	{
324	942	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
325
326	942	if (pdsactx == NULL \|\| pdsactx->mdctx == NULL)
327	0	return 0;
328
329	942	return EVP_DigestUpdate(pdsactx->mdctx, data, datalen);
330	942	}
331
332		int dsa_digest_sign_final(void vpdsactx, unsigned char sig, size_t *siglen,
333		size_t sigsize)
334	0	{
335	0	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
336	0	unsigned char digest[EVP_MAX_MD_SIZE];
337	0	unsigned int dlen = 0;
338
339	0	if (!ossl_prov_is_running() \|\| pdsactx == NULL \|\| pdsactx->mdctx == NULL)
340	0	return 0;
341
342		/*
343		* If sig is NULL then we're just finding out the sig size. Other fields
344		* are ignored. Defer to dsa_sign.
345		*/
346	0	if (sig != NULL) {
347		/*
348		* There is the possibility that some externally provided
349		* digests exceed EVP_MAX_MD_SIZE. We should probably handle that somehow -
350		* but that problem is much larger than just in DSA.
351		*/
352	0	if (!EVP_DigestFinal_ex(pdsactx->mdctx, digest, &dlen))
353	0	return 0;
354	0	}
355
356	0	pdsactx->flag_allow_md = 1;
357
358	0	return dsa_sign(vpdsactx, sig, siglen, sigsize, digest, (size_t)dlen);
359	0	}
360
361
362		int dsa_digest_verify_final(void vpdsactx, const unsigned char sig,
363		size_t siglen)
364	942	{
365	942	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
366	942	unsigned char digest[EVP_MAX_MD_SIZE];
367	942	unsigned int dlen = 0;
368
369	942	if (!ossl_prov_is_running() \|\| pdsactx == NULL \|\| pdsactx->mdctx == NULL)
370	0	return 0;
371
372		/*
373		* There is the possibility that some externally provided
374		* digests exceed EVP_MAX_MD_SIZE. We should probably handle that somehow -
375		* but that problem is much larger than just in DSA.
376		*/
377	942	if (!EVP_DigestFinal_ex(pdsactx->mdctx, digest, &dlen))
378	0	return 0;
379
380	942	pdsactx->flag_allow_md = 1;
381
382	942	return dsa_verify(vpdsactx, sig, siglen, digest, (size_t)dlen);
383	942	}
384
385		static void dsa_freectx(void *vpdsactx)
386	2.57k	{
387	2.57k	PROV_DSA_CTX ctx = (PROV_DSA_CTX )vpdsactx;
388
389	2.57k	OPENSSL_free(ctx->propq);
390	2.57k	EVP_MD_CTX_free(ctx->mdctx);
391	2.57k	EVP_MD_free(ctx->md);
392	2.57k	ctx->propq = NULL;
393	2.57k	ctx->mdctx = NULL;
394	2.57k	ctx->md = NULL;
395	2.57k	DSA_free(ctx->dsa);
396	2.57k	OPENSSL_free(ctx);
397	2.57k	}
398
399		static void dsa_dupctx(void vpdsactx)
400	1.28k	{
401	1.28k	PROV_DSA_CTX srcctx = (PROV_DSA_CTX )vpdsactx;
402	1.28k	PROV_DSA_CTX *dstctx;
403
404	1.28k	if (!ossl_prov_is_running())
405	0	return NULL;
406
407	1.28k	dstctx = OPENSSL_zalloc(sizeof(*srcctx));
408	1.28k	if (dstctx == NULL)
409	0	return NULL;
410
411	1.28k	dstctx = srcctx;
412	1.28k	dstctx->dsa = NULL;
413	1.28k	dstctx->md = NULL;
414	1.28k	dstctx->mdctx = NULL;
415	1.28k	dstctx->propq = NULL;
416
417	1.28k	if (srcctx->dsa != NULL && !DSA_up_ref(srcctx->dsa))
418	0	goto err;
419	1.28k	dstctx->dsa = srcctx->dsa;
420
421	1.28k	if (srcctx->md != NULL && !EVP_MD_up_ref(srcctx->md))
422	0	goto err;
423	1.28k	dstctx->md = srcctx->md;
424
425	1.28k	if (srcctx->mdctx != NULL) {
426	1.28k	dstctx->mdctx = EVP_MD_CTX_new();
427	1.28k	if (dstctx->mdctx == NULL
428	1.28k	\|\| !EVP_MD_CTX_copy_ex(dstctx->mdctx, srcctx->mdctx))
429	0	goto err;
430	1.28k	}
431	1.28k	if (srcctx->propq != NULL) {
432	0	dstctx->propq = OPENSSL_strdup(srcctx->propq);
433	0	if (dstctx->propq == NULL)
434	0	goto err;
435	0	}
436
437	1.28k	return dstctx;
438	0	err:
439	0	dsa_freectx(dstctx);
440	0	return NULL;
441	1.28k	}
442
443		static int dsa_get_ctx_params(void vpdsactx, OSSL_PARAM params)
444	0	{
445	0	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
446	0	OSSL_PARAM *p;
447
448	0	if (pdsactx == NULL)
449	0	return 0;
450
451	0	p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_ALGORITHM_ID);
452	0	if (p != NULL
453	0	&& !OSSL_PARAM_set_octet_string(p, pdsactx->aid, pdsactx->aid_len))
454	0	return 0;
455
456	0	p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_DIGEST);
457	0	if (p != NULL && !OSSL_PARAM_set_utf8_string(p, pdsactx->mdname))
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_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
466		OSSL_PARAM_END
467		};
468
469		static const OSSL_PARAM dsa_gettable_ctx_params(ossl_unused void ctx,
470		ossl_unused void *provctx)
471	0	{
472	0	return known_gettable_ctx_params;
473	0	}
474
475		static int dsa_set_ctx_params(void *vpdsactx, const OSSL_PARAM params[])
476	617	{
477	617	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
478	617	const OSSL_PARAM *p;
479
480	617	if (pdsactx == NULL)
481	0	return 0;
482	617	if (params == NULL)
483	617	return 1;
484
485	0	p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST);
486	0	if (p != NULL) {
487	0	char mdname[OSSL_MAX_NAME_SIZE] = "", *pmdname = mdname;
488	0	char mdprops[OSSL_MAX_PROPQUERY_SIZE] = "", *pmdprops = mdprops;
489	0	const OSSL_PARAM *propsp =
490	0	OSSL_PARAM_locate_const(params,
491	0	OSSL_SIGNATURE_PARAM_PROPERTIES);
492
493	0	if (!OSSL_PARAM_get_utf8_string(p, &pmdname, sizeof(mdname)))
494	0	return 0;
495	0	if (propsp != NULL
496	0	&& !OSSL_PARAM_get_utf8_string(propsp, &pmdprops, sizeof(mdprops)))
497	0	return 0;
498	0	if (!dsa_setup_md(pdsactx, mdname, mdprops))
499	0	return 0;
500	0	}
501
502	0	return 1;
503	0	}
504
505		static const OSSL_PARAM settable_ctx_params[] = {
506		OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
507		OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PROPERTIES, NULL, 0),
508		OSSL_PARAM_END
509		};
510
511		static const OSSL_PARAM settable_ctx_params_no_digest[] = {
512		OSSL_PARAM_END
513		};
514
515		static const OSSL_PARAM dsa_settable_ctx_params(void vpdsactx,
516		ossl_unused void *provctx)
517	1	{
518	1	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
519
520	1	if (pdsactx != NULL && !pdsactx->flag_allow_md)
521	0	return settable_ctx_params_no_digest;
522	1	return settable_ctx_params;
523	1	}
524
525		static int dsa_get_ctx_md_params(void vpdsactx, OSSL_PARAM params)
526	0	{
527	0	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
528
529	0	if (pdsactx->mdctx == NULL)
530	0	return 0;
531
532	0	return EVP_MD_CTX_get_params(pdsactx->mdctx, params);
533	0	}
534
535		static const OSSL_PARAM dsa_gettable_ctx_md_params(void vpdsactx)
536	0	{
537	0	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
538
539	0	if (pdsactx->md == NULL)
540	0	return 0;
541
542	0	return EVP_MD_gettable_ctx_params(pdsactx->md);
543	0	}
544
545		static int dsa_set_ctx_md_params(void *vpdsactx, const OSSL_PARAM params[])
546	0	{
547	0	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
548
549	0	if (pdsactx->mdctx == NULL)
550	0	return 0;
551
552	0	return EVP_MD_CTX_set_params(pdsactx->mdctx, params);
553	0	}
554
555		static const OSSL_PARAM dsa_settable_ctx_md_params(void vpdsactx)
556	0	{
557	0	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
558
559	0	if (pdsactx->md == NULL)
560	0	return 0;
561
562	0	return EVP_MD_settable_ctx_params(pdsactx->md);
563	0	}
564
565		const OSSL_DISPATCH ossl_dsa_signature_functions[] = {
566		{ OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))dsa_newctx },
567		{ OSSL_FUNC_SIGNATURE_SIGN_INIT, (void (*)(void))dsa_sign_init },
568		{ OSSL_FUNC_SIGNATURE_SIGN, (void (*)(void))dsa_sign },
569		{ OSSL_FUNC_SIGNATURE_VERIFY_INIT, (void (*)(void))dsa_verify_init },
570		{ OSSL_FUNC_SIGNATURE_VERIFY, (void (*)(void))dsa_verify },
571		{ OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT,
572		(void (*)(void))dsa_digest_sign_init },
573		{ OSSL_FUNC_SIGNATURE_DIGEST_SIGN_UPDATE,
574		(void (*)(void))dsa_digest_signverify_update },
575		{ OSSL_FUNC_SIGNATURE_DIGEST_SIGN_FINAL,
576		(void (*)(void))dsa_digest_sign_final },
577		{ OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_INIT,
578		(void (*)(void))dsa_digest_verify_init },
579		{ OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_UPDATE,
580		(void (*)(void))dsa_digest_signverify_update },
581		{ OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_FINAL,
582		(void (*)(void))dsa_digest_verify_final },
583		{ OSSL_FUNC_SIGNATURE_FREECTX, (void (*)(void))dsa_freectx },
584		{ OSSL_FUNC_SIGNATURE_DUPCTX, (void (*)(void))dsa_dupctx },
585		{ OSSL_FUNC_SIGNATURE_GET_CTX_PARAMS, (void (*)(void))dsa_get_ctx_params },
586		{ OSSL_FUNC_SIGNATURE_GETTABLE_CTX_PARAMS,
587		(void (*)(void))dsa_gettable_ctx_params },
588		{ OSSL_FUNC_SIGNATURE_SET_CTX_PARAMS, (void (*)(void))dsa_set_ctx_params },
589		{ OSSL_FUNC_SIGNATURE_SETTABLE_CTX_PARAMS,
590		(void (*)(void))dsa_settable_ctx_params },
591		{ OSSL_FUNC_SIGNATURE_GET_CTX_MD_PARAMS,
592		(void (*)(void))dsa_get_ctx_md_params },
593		{ OSSL_FUNC_SIGNATURE_GETTABLE_CTX_MD_PARAMS,
594		(void (*)(void))dsa_gettable_ctx_md_params },
595		{ OSSL_FUNC_SIGNATURE_SET_CTX_MD_PARAMS,
596		(void (*)(void))dsa_set_ctx_md_params },
597		{ OSSL_FUNC_SIGNATURE_SETTABLE_CTX_MD_PARAMS,
598		(void (*)(void))dsa_settable_ctx_md_params },
599		{ 0, NULL }
600		};