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

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/*
 * Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the Apache License 2.0 (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

/*
 * 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/err.h>
#include <openssl/proverr.h>
#include "internal/nelem.h"
#include "internal/sizes.h"
#include "internal/cryptlib.h"
#include "prov/providercommon.h"
#include "prov/implementations.h"
#include "prov/provider_ctx.h"
#include "prov/securitycheck.h"
#include "crypto/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 2019-2021 The OpenSSL Project Authors. All Rights Reserved.
3		*
4		* Licensed under the Apache License 2.0 (the "License"). You may not use
5		* this file except in compliance with the License. You can obtain a copy
6		* in the file LICENSE in the source distribution or at
7		* https://www.openssl.org/source/license.html
8		*/
9
10		/*
11		* 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/err.h>
26		#include <openssl/proverr.h>
27		#include "internal/nelem.h"
28		#include "internal/sizes.h"
29		#include "internal/cryptlib.h"
30		#include "prov/providercommon.h"
31		#include "prov/implementations.h"
32		#include "prov/provider_ctx.h"
33		#include "prov/securitycheck.h"
34		#include "crypto/dsa.h"
35		#include "prov/der_dsa.h"
36
37		static OSSL_FUNC_signature_newctx_fn dsa_newctx;
38		static OSSL_FUNC_signature_sign_init_fn dsa_sign_init;
39		static OSSL_FUNC_signature_verify_init_fn dsa_verify_init;
40		static OSSL_FUNC_signature_sign_fn dsa_sign;
41		static OSSL_FUNC_signature_verify_fn dsa_verify;
42		static OSSL_FUNC_signature_digest_sign_init_fn dsa_digest_sign_init;
43		static OSSL_FUNC_signature_digest_sign_update_fn dsa_digest_signverify_update;
44		static OSSL_FUNC_signature_digest_sign_final_fn dsa_digest_sign_final;
45		static OSSL_FUNC_signature_digest_verify_init_fn dsa_digest_verify_init;
46		static OSSL_FUNC_signature_digest_verify_update_fn dsa_digest_signverify_update;
47		static OSSL_FUNC_signature_digest_verify_final_fn dsa_digest_verify_final;
48		static OSSL_FUNC_signature_freectx_fn dsa_freectx;
49		static OSSL_FUNC_signature_dupctx_fn dsa_dupctx;
50		static OSSL_FUNC_signature_get_ctx_params_fn dsa_get_ctx_params;
51		static OSSL_FUNC_signature_gettable_ctx_params_fn dsa_gettable_ctx_params;
52		static OSSL_FUNC_signature_set_ctx_params_fn dsa_set_ctx_params;
53		static OSSL_FUNC_signature_settable_ctx_params_fn dsa_settable_ctx_params;
54		static OSSL_FUNC_signature_get_ctx_md_params_fn dsa_get_ctx_md_params;
55		static OSSL_FUNC_signature_gettable_ctx_md_params_fn dsa_gettable_ctx_md_params;
56		static OSSL_FUNC_signature_set_ctx_md_params_fn dsa_set_ctx_md_params;
57		static OSSL_FUNC_signature_settable_ctx_md_params_fn dsa_settable_ctx_md_params;
58
59		/*
60		* What's passed as an actual key is defined by the KEYMGMT interface.
61		* We happen to know that our KEYMGMT simply passes DSA structures, so
62		* we use that here too.
63		*/
64
65		typedef struct {
66		OSSL_LIB_CTX *libctx;
67		char *propq;
68		DSA *dsa;
69
70		/*
71		* Flag to determine if the hash function can be changed (1) or not (0)
72		* Because it's dangerous to change during a DigestSign or DigestVerify
73		* operation, this flag is cleared by their Init function, and set again
74		* by their Final function.
75		*/
76		unsigned int flag_allow_md : 1;
77
78		char mdname[OSSL_MAX_NAME_SIZE];
79
80		/* The Algorithm Identifier of the combined signature algorithm */
81		unsigned char aid_buf[OSSL_MAX_ALGORITHM_ID_SIZE];
82		unsigned char *aid;
83		size_t aid_len;
84
85		/* main digest */
86		EVP_MD *md;
87		EVP_MD_CTX *mdctx;
88		int operation;
89		} PROV_DSA_CTX;
90
91
92		static size_t dsa_get_md_size(const PROV_DSA_CTX *pdsactx)
93	942	{
94	942	if (pdsactx->md != NULL)
95	942	return EVP_MD_get_size(pdsactx->md);
96	0	return 0;
97	942	}
98
99		static void dsa_newctx(void provctx, const char *propq)
100	1.28k	{
101	1.28k	PROV_DSA_CTX *pdsactx;
102
103	1.28k	if (!ossl_prov_is_running())
104	0	return NULL;
105
106	1.28k	pdsactx = OPENSSL_zalloc(sizeof(PROV_DSA_CTX));
107	1.28k	if (pdsactx == NULL)
108	0	return NULL;
109
110	1.28k	pdsactx->libctx = PROV_LIBCTX_OF(provctx);
111	1.28k	pdsactx->flag_allow_md = 1;
112	1.28k	if (propq != NULL && (pdsactx->propq = OPENSSL_strdup(propq)) == NULL) {
113	0	OPENSSL_free(pdsactx);
114	0	pdsactx = NULL;
115	0	ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
116	0	}
117	1.28k	return pdsactx;
118	1.28k	}
119
120		static int dsa_setup_md(PROV_DSA_CTX *ctx,
121		const char mdname, const char mdprops)
122	942	{
123	942	if (mdprops == NULL)
124	942	mdprops = ctx->propq;
125
126	942	if (mdname != NULL) {
127	942	int sha1_allowed = (ctx->operation != EVP_PKEY_OP_SIGN);
128	942	WPACKET pkt;
129	942	EVP_MD *md = EVP_MD_fetch(ctx->libctx, mdname, mdprops);
130	942	int md_nid = ossl_digest_get_approved_nid_with_sha1(ctx->libctx, md,
131	942	sha1_allowed);
132	942	size_t mdname_len = strlen(mdname);
133
134	942	if (md == NULL \|\| md_nid < 0) {
135	0	if (md == NULL)
136	0	ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
137	0	"%s could not be fetched", mdname);
138	0	if (md_nid < 0)
139	0	ERR_raise_data(ERR_LIB_PROV, PROV_R_DIGEST_NOT_ALLOWED,
140	0	"digest=%s", mdname);
141	0	if (mdname_len >= sizeof(ctx->mdname))
142	0	ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
143	0	"%s exceeds name buffer length", mdname);
144	0	EVP_MD_free(md);
145	0	return 0;
146	0	}
147
148	942	if (!ctx->flag_allow_md) {
149	0	if (ctx->mdname[0] != '\0' && !EVP_MD_is_a(md, ctx->mdname)) {
150	0	ERR_raise_data(ERR_LIB_PROV, PROV_R_DIGEST_NOT_ALLOWED,
151	0	"digest %s != %s", mdname, ctx->mdname);
152	0	EVP_MD_free(md);
153	0	return 0;
154	0	}
155	0	EVP_MD_free(md);
156	0	return 1;
157	0	}
158
159	942	EVP_MD_CTX_free(ctx->mdctx);
160	942	EVP_MD_free(ctx->md);
161
162		/*
163		* We do not care about DER writing errors.
164		* All it really means is that for some reason, there's no
165		* AlgorithmIdentifier to be had, but the operation itself is
166		* still valid, just as long as it's not used to construct
167		* anything that needs an AlgorithmIdentifier.
168		*/
169	942	ctx->aid_len = 0;
170	942	if (WPACKET_init_der(&pkt, ctx->aid_buf, sizeof(ctx->aid_buf))
171	942	&& ossl_DER_w_algorithmIdentifier_DSA_with_MD(&pkt, -1, ctx->dsa,
172	942	md_nid)
173	942	&& WPACKET_finish(&pkt)) {
174	942	WPACKET_get_total_written(&pkt, &ctx->aid_len);
175	942	ctx->aid = WPACKET_get_curr(&pkt);
176	942	}
177	942	WPACKET_cleanup(&pkt);
178
179	942	ctx->mdctx = NULL;
180	942	ctx->md = md;
181	942	OPENSSL_strlcpy(ctx->mdname, mdname, sizeof(ctx->mdname));
182	942	}
183	942	return 1;
184	942	}
185
186		static int dsa_signverify_init(void vpdsactx, void vdsa,
187		const OSSL_PARAM params[], int operation)
188	942	{
189	942	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
190
191	942	if (!ossl_prov_is_running()
192	942	\|\| pdsactx == NULL)
193	0	return 0;
194
195	942	if (vdsa == NULL && pdsactx->dsa == NULL) {
196	0	ERR_raise(ERR_LIB_PROV, PROV_R_NO_KEY_SET);
197	0	return 0;
198	0	}
199
200	942	if (vdsa != NULL) {
201	942	if (!ossl_dsa_check_key(pdsactx->libctx, vdsa,
202	942	operation == EVP_PKEY_OP_SIGN)) {
203	0	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
204	0	return 0;
205	0	}
206	942	if (!DSA_up_ref(vdsa))
207	0	return 0;
208	942	DSA_free(pdsactx->dsa);
209	942	pdsactx->dsa = vdsa;
210	942	}
211
212	942	pdsactx->operation = operation;
213
214	942	if (!dsa_set_ctx_params(pdsactx, params))
215	0	return 0;
216
217	942	return 1;
218	942	}
219
220		static int dsa_sign_init(void vpdsactx, void vdsa, const OSSL_PARAM params[])
221	0	{
222	0	return dsa_signverify_init(vpdsactx, vdsa, params, EVP_PKEY_OP_SIGN);
223	0	}
224
225		static int dsa_verify_init(void vpdsactx, void vdsa,
226		const OSSL_PARAM params[])
227	0	{
228	0	return dsa_signverify_init(vpdsactx, vdsa, params, EVP_PKEY_OP_VERIFY);
229	0	}
230
231		static int dsa_sign(void vpdsactx, unsigned char sig, size_t *siglen,
232		size_t sigsize, const unsigned char *tbs, size_t tbslen)
233	0	{
234	0	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
235	0	int ret;
236	0	unsigned int sltmp;
237	0	size_t dsasize = DSA_size(pdsactx->dsa);
238	0	size_t mdsize = dsa_get_md_size(pdsactx);
239
240	0	if (!ossl_prov_is_running())
241	0	return 0;
242
243	0	if (sig == NULL) {
244	0	*siglen = dsasize;
245	0	return 1;
246	0	}
247
248	0	if (sigsize < (size_t)dsasize)
249	0	return 0;
250
251	0	if (mdsize != 0 && tbslen != mdsize)
252	0	return 0;
253
254	0	ret = ossl_dsa_sign_int(0, tbs, tbslen, sig, &sltmp, pdsactx->dsa);
255	0	if (ret <= 0)
256	0	return 0;
257
258	0	*siglen = sltmp;
259	0	return 1;
260	0	}
261
262		static int dsa_verify(void vpdsactx, const unsigned char sig, size_t siglen,
263		const unsigned char *tbs, size_t tbslen)
264	942	{
265	942	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
266	942	size_t mdsize = dsa_get_md_size(pdsactx);
267
268	942	if (!ossl_prov_is_running() \|\| (mdsize != 0 && tbslen != mdsize))
269	0	return 0;
270
271	942	return DSA_verify(0, tbs, tbslen, sig, siglen, pdsactx->dsa);
272	942	}
273
274		static int dsa_digest_signverify_init(void vpdsactx, const char mdname,
275		void *vdsa, const OSSL_PARAM params[],
276		int operation)
277	942	{
278	942	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
279
280	942	if (!ossl_prov_is_running())
281	0	return 0;
282
283	942	if (!dsa_signverify_init(vpdsactx, vdsa, params, operation))
284	0	return 0;
285
286	942	if (!dsa_setup_md(pdsactx, mdname, NULL))
287	0	return 0;
288
289	942	pdsactx->flag_allow_md = 0;
290
291	942	if (pdsactx->mdctx == NULL) {
292	942	pdsactx->mdctx = EVP_MD_CTX_new();
293	942	if (pdsactx->mdctx == NULL)
294	0	goto error;
295	942	}
296
297	942	if (!EVP_DigestInit_ex2(pdsactx->mdctx, pdsactx->md, params))
298	0	goto error;
299
300	942	return 1;
301
302	0	error:
303	0	EVP_MD_CTX_free(pdsactx->mdctx);
304	0	pdsactx->mdctx = NULL;
305	0	return 0;
306	942	}
307
308		static int dsa_digest_sign_init(void vpdsactx, const char mdname,
309		void *vdsa, const OSSL_PARAM params[])
310	0	{
311	0	return dsa_digest_signverify_init(vpdsactx, mdname, vdsa, params,
312	0	EVP_PKEY_OP_SIGN);
313	0	}
314
315		static int dsa_digest_verify_init(void vpdsactx, const char mdname,
316		void *vdsa, const OSSL_PARAM params[])
317	1.28k	{
318	1.28k	return dsa_digest_signverify_init(vpdsactx, mdname, vdsa, params,
319	1.28k	EVP_PKEY_OP_VERIFY);
320	1.28k	}
321
322		int dsa_digest_signverify_update(void vpdsactx, const unsigned char data,
323		size_t datalen)
324	942	{
325	942	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
326
327	942	if (pdsactx == NULL \|\| pdsactx->mdctx == NULL)
328	0	return 0;
329
330	942	return EVP_DigestUpdate(pdsactx->mdctx, data, datalen);
331	942	}
332
333		int dsa_digest_sign_final(void vpdsactx, unsigned char sig, size_t *siglen,
334		size_t sigsize)
335	0	{
336	0	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
337	0	unsigned char digest[EVP_MAX_MD_SIZE];
338	0	unsigned int dlen = 0;
339
340	0	if (!ossl_prov_is_running() \|\| pdsactx == NULL \|\| pdsactx->mdctx == NULL)
341	0	return 0;
342
343		/*
344		* If sig is NULL then we're just finding out the sig size. Other fields
345		* are ignored. Defer to dsa_sign.
346		*/
347	0	if (sig != NULL) {
348		/*
349		* There is the possibility that some externally provided
350		* digests exceed EVP_MAX_MD_SIZE. We should probably handle that somehow -
351		* but that problem is much larger than just in DSA.
352		*/
353	0	if (!EVP_DigestFinal_ex(pdsactx->mdctx, digest, &dlen))
354	0	return 0;
355	0	}
356
357	0	pdsactx->flag_allow_md = 1;
358
359	0	return dsa_sign(vpdsactx, sig, siglen, sigsize, digest, (size_t)dlen);
360	0	}
361
362
363		int dsa_digest_verify_final(void vpdsactx, const unsigned char sig,
364		size_t siglen)
365	942	{
366	942	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
367	942	unsigned char digest[EVP_MAX_MD_SIZE];
368	942	unsigned int dlen = 0;
369
370	942	if (!ossl_prov_is_running() \|\| pdsactx == NULL \|\| pdsactx->mdctx == NULL)
371	0	return 0;
372
373		/*
374		* There is the possibility that some externally provided
375		* digests exceed EVP_MAX_MD_SIZE. We should probably handle that somehow -
376		* but that problem is much larger than just in DSA.
377		*/
378	942	if (!EVP_DigestFinal_ex(pdsactx->mdctx, digest, &dlen))
379	0	return 0;
380
381	942	pdsactx->flag_allow_md = 1;
382
383	942	return dsa_verify(vpdsactx, sig, siglen, digest, (size_t)dlen);
384	942	}
385
386		static void dsa_freectx(void *vpdsactx)
387	2.57k	{
388	2.57k	PROV_DSA_CTX ctx = (PROV_DSA_CTX )vpdsactx;
389
390	2.57k	OPENSSL_free(ctx->propq);
391	2.57k	EVP_MD_CTX_free(ctx->mdctx);
392	2.57k	EVP_MD_free(ctx->md);
393	2.57k	ctx->propq = NULL;
394	2.57k	ctx->mdctx = NULL;
395	2.57k	ctx->md = NULL;
396	2.57k	DSA_free(ctx->dsa);
397	2.57k	OPENSSL_free(ctx);
398	2.57k	}
399
400		static void dsa_dupctx(void vpdsactx)
401	1.28k	{
402	1.28k	PROV_DSA_CTX srcctx = (PROV_DSA_CTX )vpdsactx;
403	1.28k	PROV_DSA_CTX *dstctx;
404
405	1.28k	if (!ossl_prov_is_running())
406	0	return NULL;
407
408	1.28k	dstctx = OPENSSL_zalloc(sizeof(*srcctx));
409	1.28k	if (dstctx == NULL)
410	0	return NULL;
411
412	1.28k	dstctx = srcctx;
413	1.28k	dstctx->dsa = NULL;
414	1.28k	dstctx->md = NULL;
415	1.28k	dstctx->mdctx = NULL;
416	1.28k	dstctx->propq = NULL;
417
418	1.28k	if (srcctx->dsa != NULL && !DSA_up_ref(srcctx->dsa))
419	0	goto err;
420	1.28k	dstctx->dsa = srcctx->dsa;
421
422	1.28k	if (srcctx->md != NULL && !EVP_MD_up_ref(srcctx->md))
423	0	goto err;
424	1.28k	dstctx->md = srcctx->md;
425
426	1.28k	if (srcctx->mdctx != NULL) {
427	1.28k	dstctx->mdctx = EVP_MD_CTX_new();
428	1.28k	if (dstctx->mdctx == NULL
429	1.28k	\|\| !EVP_MD_CTX_copy_ex(dstctx->mdctx, srcctx->mdctx))
430	0	goto err;
431	1.28k	}
432	1.28k	if (srcctx->propq != NULL) {
433	0	dstctx->propq = OPENSSL_strdup(srcctx->propq);
434	0	if (dstctx->propq == NULL)
435	0	goto err;
436	0	}
437
438	1.28k	return dstctx;
439	0	err:
440	0	dsa_freectx(dstctx);
441	0	return NULL;
442	1.28k	}
443
444		static int dsa_get_ctx_params(void vpdsactx, OSSL_PARAM params)
445	0	{
446	0	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
447	0	OSSL_PARAM *p;
448
449	0	if (pdsactx == NULL)
450	0	return 0;
451
452	0	p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_ALGORITHM_ID);
453	0	if (p != NULL
454	0	&& !OSSL_PARAM_set_octet_string(p, pdsactx->aid, pdsactx->aid_len))
455	0	return 0;
456
457	0	p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_DIGEST);
458	0	if (p != NULL && !OSSL_PARAM_set_utf8_string(p, pdsactx->mdname))
459	0	return 0;
460
461	0	return 1;
462	0	}
463
464		static const OSSL_PARAM known_gettable_ctx_params[] = {
465		OSSL_PARAM_octet_string(OSSL_SIGNATURE_PARAM_ALGORITHM_ID, NULL, 0),
466		OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
467		OSSL_PARAM_END
468		};
469
470		static const OSSL_PARAM dsa_gettable_ctx_params(ossl_unused void ctx,
471		ossl_unused void *provctx)
472	0	{
473	0	return known_gettable_ctx_params;
474	0	}
475
476		static int dsa_set_ctx_params(void *vpdsactx, const OSSL_PARAM params[])
477	617	{
478	617	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
479	617	const OSSL_PARAM *p;
480
481	617	if (pdsactx == NULL)
482	0	return 0;
483	617	if (params == NULL)
484	617	return 1;
485
486	0	p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST);
487	0	if (p != NULL) {
488	0	char mdname[OSSL_MAX_NAME_SIZE] = "", *pmdname = mdname;
489	0	char mdprops[OSSL_MAX_PROPQUERY_SIZE] = "", *pmdprops = mdprops;
490	0	const OSSL_PARAM *propsp =
491	0	OSSL_PARAM_locate_const(params,
492	0	OSSL_SIGNATURE_PARAM_PROPERTIES);
493
494	0	if (!OSSL_PARAM_get_utf8_string(p, &pmdname, sizeof(mdname)))
495	0	return 0;
496	0	if (propsp != NULL
497	0	&& !OSSL_PARAM_get_utf8_string(propsp, &pmdprops, sizeof(mdprops)))
498	0	return 0;
499	0	if (!dsa_setup_md(pdsactx, mdname, mdprops))
500	0	return 0;
501	0	}
502
503	0	return 1;
504	0	}
505
506		static const OSSL_PARAM settable_ctx_params[] = {
507		OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
508		OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PROPERTIES, NULL, 0),
509		OSSL_PARAM_END
510		};
511
512		static const OSSL_PARAM settable_ctx_params_no_digest[] = {
513		OSSL_PARAM_END
514		};
515
516		static const OSSL_PARAM dsa_settable_ctx_params(void vpdsactx,
517		ossl_unused void *provctx)
518	1	{
519	1	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
520
521	1	if (pdsactx != NULL && !pdsactx->flag_allow_md)
522	0	return settable_ctx_params_no_digest;
523	1	return settable_ctx_params;
524	1	}
525
526		static int dsa_get_ctx_md_params(void vpdsactx, OSSL_PARAM params)
527	0	{
528	0	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
529
530	0	if (pdsactx->mdctx == NULL)
531	0	return 0;
532
533	0	return EVP_MD_CTX_get_params(pdsactx->mdctx, params);
534	0	}
535
536		static const OSSL_PARAM dsa_gettable_ctx_md_params(void vpdsactx)
537	0	{
538	0	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
539
540	0	if (pdsactx->md == NULL)
541	0	return 0;
542
543	0	return EVP_MD_gettable_ctx_params(pdsactx->md);
544	0	}
545
546		static int dsa_set_ctx_md_params(void *vpdsactx, const OSSL_PARAM params[])
547	0	{
548	0	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
549
550	0	if (pdsactx->mdctx == NULL)
551	0	return 0;
552
553	0	return EVP_MD_CTX_set_params(pdsactx->mdctx, params);
554	0	}
555
556		static const OSSL_PARAM dsa_settable_ctx_md_params(void vpdsactx)
557	0	{
558	0	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
559
560	0	if (pdsactx->md == NULL)
561	0	return 0;
562
563	0	return EVP_MD_settable_ctx_params(pdsactx->md);
564	0	}
565
566		const OSSL_DISPATCH ossl_dsa_signature_functions[] = {
567		{ OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))dsa_newctx },
568		{ OSSL_FUNC_SIGNATURE_SIGN_INIT, (void (*)(void))dsa_sign_init },
569		{ OSSL_FUNC_SIGNATURE_SIGN, (void (*)(void))dsa_sign },
570		{ OSSL_FUNC_SIGNATURE_VERIFY_INIT, (void (*)(void))dsa_verify_init },
571		{ OSSL_FUNC_SIGNATURE_VERIFY, (void (*)(void))dsa_verify },
572		{ OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT,
573		(void (*)(void))dsa_digest_sign_init },
574		{ OSSL_FUNC_SIGNATURE_DIGEST_SIGN_UPDATE,
575		(void (*)(void))dsa_digest_signverify_update },
576		{ OSSL_FUNC_SIGNATURE_DIGEST_SIGN_FINAL,
577		(void (*)(void))dsa_digest_sign_final },
578		{ OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_INIT,
579		(void (*)(void))dsa_digest_verify_init },
580		{ OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_UPDATE,
581		(void (*)(void))dsa_digest_signverify_update },
582		{ OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_FINAL,
583		(void (*)(void))dsa_digest_verify_final },
584		{ OSSL_FUNC_SIGNATURE_FREECTX, (void (*)(void))dsa_freectx },
585		{ OSSL_FUNC_SIGNATURE_DUPCTX, (void (*)(void))dsa_dupctx },
586		{ OSSL_FUNC_SIGNATURE_GET_CTX_PARAMS, (void (*)(void))dsa_get_ctx_params },
587		{ OSSL_FUNC_SIGNATURE_GETTABLE_CTX_PARAMS,
588		(void (*)(void))dsa_gettable_ctx_params },
589		{ OSSL_FUNC_SIGNATURE_SET_CTX_PARAMS, (void (*)(void))dsa_set_ctx_params },
590		{ OSSL_FUNC_SIGNATURE_SETTABLE_CTX_PARAMS,
591		(void (*)(void))dsa_settable_ctx_params },
592		{ OSSL_FUNC_SIGNATURE_GET_CTX_MD_PARAMS,
593		(void (*)(void))dsa_get_ctx_md_params },
594		{ OSSL_FUNC_SIGNATURE_GETTABLE_CTX_MD_PARAMS,
595		(void (*)(void))dsa_gettable_ctx_md_params },
596		{ OSSL_FUNC_SIGNATURE_SET_CTX_MD_PARAMS,
597		(void (*)(void))dsa_set_ctx_md_params },
598		{ OSSL_FUNC_SIGNATURE_SETTABLE_CTX_MD_PARAMS,
599		(void (*)(void))dsa_settable_ctx_md_params },
600		{ 0, NULL }
601		};