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

Source (jump to first uncovered line)
/*
 * Copyright 2019-2023 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;

    /* If this is set to 1 then the generated k is not random */
    unsigned int nonce_type;

    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)
{
    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;
    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)
{
    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,
                            pdsactx->nonce_type, pdsactx->mdname,
                            pdsactx->libctx, pdsactx->propq);
    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;

    p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_NONCE_TYPE);
    if (p != NULL && !OSSL_PARAM_set_uint(p, pdsactx->nonce_type))
        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_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;
    }
    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;
}

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_uint(OSSL_SIGNATURE_PARAM_NONCE_TYPE, NULL),
    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 },
    OSSL_DISPATCH_END
};

Coverage Report

Created: 2024-05-21 06:33

Line	Count	Source (jump to first uncovered line)
1		/*
2		* Copyright 2019-2023 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		/* If this is set to 1 then the generated k is not random */
78		unsigned int nonce_type;
79
80		char mdname[OSSL_MAX_NAME_SIZE];
81
82		/* The Algorithm Identifier of the combined signature algorithm */
83		unsigned char aid_buf[OSSL_MAX_ALGORITHM_ID_SIZE];
84		unsigned char *aid;
85		size_t aid_len;
86
87		/* main digest */
88		EVP_MD *md;
89		EVP_MD_CTX *mdctx;
90		int operation;
91		} PROV_DSA_CTX;
92
93
94		static size_t dsa_get_md_size(const PROV_DSA_CTX *pdsactx)
95	0	{
96	0	int md_size;
97
98	0	if (pdsactx->md != NULL) {
99	0	md_size = EVP_MD_get_size(pdsactx->md);
100	0	if (md_size <= 0)
101	0	return 0;
102	0	return (size_t)md_size;
103	0	}
104	0	return 0;
105	0	}
106
107		static void dsa_newctx(void provctx, const char *propq)
108	0	{
109	0	PROV_DSA_CTX *pdsactx;
110
111	0	if (!ossl_prov_is_running())
112	0	return NULL;
113
114	0	pdsactx = OPENSSL_zalloc(sizeof(PROV_DSA_CTX));
115	0	if (pdsactx == NULL)
116	0	return NULL;
117
118	0	pdsactx->libctx = PROV_LIBCTX_OF(provctx);
119	0	pdsactx->flag_allow_md = 1;
120	0	if (propq != NULL && (pdsactx->propq = OPENSSL_strdup(propq)) == NULL) {
121	0	OPENSSL_free(pdsactx);
122	0	pdsactx = NULL;
123	0	}
124	0	return pdsactx;
125	0	}
126
127		static int dsa_setup_md(PROV_DSA_CTX *ctx,
128		const char mdname, const char mdprops)
129	0	{
130	0	if (mdprops == NULL)
131	0	mdprops = ctx->propq;
132
133	0	if (mdname != NULL) {
134	0	int sha1_allowed = (ctx->operation != EVP_PKEY_OP_SIGN);
135	0	WPACKET pkt;
136	0	EVP_MD *md = EVP_MD_fetch(ctx->libctx, mdname, mdprops);
137	0	int md_nid = ossl_digest_get_approved_nid_with_sha1(ctx->libctx, md,
138	0	sha1_allowed);
139	0	size_t mdname_len = strlen(mdname);
140
141	0	if (md == NULL \|\| md_nid < 0) {
142	0	if (md == NULL)
143	0	ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
144	0	"%s could not be fetched", mdname);
145	0	if (md_nid < 0)
146	0	ERR_raise_data(ERR_LIB_PROV, PROV_R_DIGEST_NOT_ALLOWED,
147	0	"digest=%s", mdname);
148	0	if (mdname_len >= sizeof(ctx->mdname))
149	0	ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
150	0	"%s exceeds name buffer length", mdname);
151	0	EVP_MD_free(md);
152	0	return 0;
153	0	}
154
155	0	if (!ctx->flag_allow_md) {
156	0	if (ctx->mdname[0] != '\0' && !EVP_MD_is_a(md, ctx->mdname)) {
157	0	ERR_raise_data(ERR_LIB_PROV, PROV_R_DIGEST_NOT_ALLOWED,
158	0	"digest %s != %s", mdname, ctx->mdname);
159	0	EVP_MD_free(md);
160	0	return 0;
161	0	}
162	0	EVP_MD_free(md);
163	0	return 1;
164	0	}
165
166	0	EVP_MD_CTX_free(ctx->mdctx);
167	0	EVP_MD_free(ctx->md);
168
169		/*
170		* We do not care about DER writing errors.
171		* All it really means is that for some reason, there's no
172		* AlgorithmIdentifier to be had, but the operation itself is
173		* still valid, just as long as it's not used to construct
174		* anything that needs an AlgorithmIdentifier.
175		*/
176	0	ctx->aid_len = 0;
177	0	if (WPACKET_init_der(&pkt, ctx->aid_buf, sizeof(ctx->aid_buf))
178	0	&& ossl_DER_w_algorithmIdentifier_DSA_with_MD(&pkt, -1, ctx->dsa,
179	0	md_nid)
180	0	&& WPACKET_finish(&pkt)) {
181	0	WPACKET_get_total_written(&pkt, &ctx->aid_len);
182	0	ctx->aid = WPACKET_get_curr(&pkt);
183	0	}
184	0	WPACKET_cleanup(&pkt);
185
186	0	ctx->mdctx = NULL;
187	0	ctx->md = md;
188	0	OPENSSL_strlcpy(ctx->mdname, mdname, sizeof(ctx->mdname));
189	0	}
190	0	return 1;
191	0	}
192
193		static int dsa_signverify_init(void vpdsactx, void vdsa,
194		const OSSL_PARAM params[], int operation)
195	0	{
196	0	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
197
198	0	if (!ossl_prov_is_running()
199	0	\|\| pdsactx == NULL)
200	0	return 0;
201
202	0	if (vdsa == NULL && pdsactx->dsa == NULL) {
203	0	ERR_raise(ERR_LIB_PROV, PROV_R_NO_KEY_SET);
204	0	return 0;
205	0	}
206
207	0	if (vdsa != NULL) {
208	0	if (!ossl_dsa_check_key(pdsactx->libctx, vdsa,
209	0	operation == EVP_PKEY_OP_SIGN)) {
210	0	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
211	0	return 0;
212	0	}
213	0	if (!DSA_up_ref(vdsa))
214	0	return 0;
215	0	DSA_free(pdsactx->dsa);
216	0	pdsactx->dsa = vdsa;
217	0	}
218
219	0	pdsactx->operation = operation;
220
221	0	if (!dsa_set_ctx_params(pdsactx, params))
222	0	return 0;
223
224	0	return 1;
225	0	}
226
227		static int dsa_sign_init(void vpdsactx, void vdsa, const OSSL_PARAM params[])
228	0	{
229	0	return dsa_signverify_init(vpdsactx, vdsa, params, EVP_PKEY_OP_SIGN);
230	0	}
231
232		static int dsa_verify_init(void vpdsactx, void vdsa,
233		const OSSL_PARAM params[])
234	0	{
235	0	return dsa_signverify_init(vpdsactx, vdsa, params, EVP_PKEY_OP_VERIFY);
236	0	}
237
238		static int dsa_sign(void vpdsactx, unsigned char sig, size_t *siglen,
239		size_t sigsize, const unsigned char *tbs, size_t tbslen)
240	0	{
241	0	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
242	0	int ret;
243	0	unsigned int sltmp;
244	0	size_t dsasize = DSA_size(pdsactx->dsa);
245	0	size_t mdsize = dsa_get_md_size(pdsactx);
246
247	0	if (!ossl_prov_is_running())
248	0	return 0;
249
250	0	if (sig == NULL) {
251	0	*siglen = dsasize;
252	0	return 1;
253	0	}
254
255	0	if (sigsize < (size_t)dsasize)
256	0	return 0;
257
258	0	if (mdsize != 0 && tbslen != mdsize)
259	0	return 0;
260
261	0	ret = ossl_dsa_sign_int(0, tbs, tbslen, sig, &sltmp, pdsactx->dsa,
262	0	pdsactx->nonce_type, pdsactx->mdname,
263	0	pdsactx->libctx, pdsactx->propq);
264	0	if (ret <= 0)
265	0	return 0;
266
267	0	*siglen = sltmp;
268	0	return 1;
269	0	}
270
271		static int dsa_verify(void vpdsactx, const unsigned char sig, size_t siglen,
272		const unsigned char *tbs, size_t tbslen)
273	0	{
274	0	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
275	0	size_t mdsize = dsa_get_md_size(pdsactx);
276
277	0	if (!ossl_prov_is_running() \|\| (mdsize != 0 && tbslen != mdsize))
278	0	return 0;
279
280	0	return DSA_verify(0, tbs, tbslen, sig, siglen, pdsactx->dsa);
281	0	}
282
283		static int dsa_digest_signverify_init(void vpdsactx, const char mdname,
284		void *vdsa, const OSSL_PARAM params[],
285		int operation)
286	0	{
287	0	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
288
289	0	if (!ossl_prov_is_running())
290	0	return 0;
291
292	0	if (!dsa_signverify_init(vpdsactx, vdsa, params, operation))
293	0	return 0;
294
295	0	if (!dsa_setup_md(pdsactx, mdname, NULL))
296	0	return 0;
297
298	0	pdsactx->flag_allow_md = 0;
299
300	0	if (pdsactx->mdctx == NULL) {
301	0	pdsactx->mdctx = EVP_MD_CTX_new();
302	0	if (pdsactx->mdctx == NULL)
303	0	goto error;
304	0	}
305
306	0	if (!EVP_DigestInit_ex2(pdsactx->mdctx, pdsactx->md, params))
307	0	goto error;
308
309	0	return 1;
310
311	0	error:
312	0	EVP_MD_CTX_free(pdsactx->mdctx);
313	0	pdsactx->mdctx = NULL;
314	0	return 0;
315	0	}
316
317		static int dsa_digest_sign_init(void vpdsactx, const char mdname,
318		void *vdsa, const OSSL_PARAM params[])
319	0	{
320	0	return dsa_digest_signverify_init(vpdsactx, mdname, vdsa, params,
321	0	EVP_PKEY_OP_SIGN);
322	0	}
323
324		static int dsa_digest_verify_init(void vpdsactx, const char mdname,
325		void *vdsa, const OSSL_PARAM params[])
326	0	{
327	0	return dsa_digest_signverify_init(vpdsactx, mdname, vdsa, params,
328	0	EVP_PKEY_OP_VERIFY);
329	0	}
330
331		int dsa_digest_signverify_update(void vpdsactx, const unsigned char data,
332		size_t datalen)
333	0	{
334	0	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
335
336	0	if (pdsactx == NULL \|\| pdsactx->mdctx == NULL)
337	0	return 0;
338
339	0	return EVP_DigestUpdate(pdsactx->mdctx, data, datalen);
340	0	}
341
342		int dsa_digest_sign_final(void vpdsactx, unsigned char sig, size_t *siglen,
343		size_t sigsize)
344	0	{
345	0	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
346	0	unsigned char digest[EVP_MAX_MD_SIZE];
347	0	unsigned int dlen = 0;
348
349	0	if (!ossl_prov_is_running() \|\| pdsactx == NULL \|\| pdsactx->mdctx == NULL)
350	0	return 0;
351
352		/*
353		* If sig is NULL then we're just finding out the sig size. Other fields
354		* are ignored. Defer to dsa_sign.
355		*/
356	0	if (sig != NULL) {
357		/*
358		* There is the possibility that some externally provided
359		* digests exceed EVP_MAX_MD_SIZE. We should probably handle that somehow -
360		* but that problem is much larger than just in DSA.
361		*/
362	0	if (!EVP_DigestFinal_ex(pdsactx->mdctx, digest, &dlen))
363	0	return 0;
364	0	}
365
366	0	pdsactx->flag_allow_md = 1;
367
368	0	return dsa_sign(vpdsactx, sig, siglen, sigsize, digest, (size_t)dlen);
369	0	}
370
371
372		int dsa_digest_verify_final(void vpdsactx, const unsigned char sig,
373		size_t siglen)
374	0	{
375	0	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
376	0	unsigned char digest[EVP_MAX_MD_SIZE];
377	0	unsigned int dlen = 0;
378
379	0	if (!ossl_prov_is_running() \|\| pdsactx == NULL \|\| pdsactx->mdctx == NULL)
380	0	return 0;
381
382		/*
383		* There is the possibility that some externally provided
384		* digests exceed EVP_MAX_MD_SIZE. We should probably handle that somehow -
385		* but that problem is much larger than just in DSA.
386		*/
387	0	if (!EVP_DigestFinal_ex(pdsactx->mdctx, digest, &dlen))
388	0	return 0;
389
390	0	pdsactx->flag_allow_md = 1;
391
392	0	return dsa_verify(vpdsactx, sig, siglen, digest, (size_t)dlen);
393	0	}
394
395		static void dsa_freectx(void *vpdsactx)
396	0	{
397	0	PROV_DSA_CTX ctx = (PROV_DSA_CTX )vpdsactx;
398
399	0	OPENSSL_free(ctx->propq);
400	0	EVP_MD_CTX_free(ctx->mdctx);
401	0	EVP_MD_free(ctx->md);
402	0	ctx->propq = NULL;
403	0	ctx->mdctx = NULL;
404	0	ctx->md = NULL;
405	0	DSA_free(ctx->dsa);
406	0	OPENSSL_free(ctx);
407	0	}
408
409		static void dsa_dupctx(void vpdsactx)
410	0	{
411	0	PROV_DSA_CTX srcctx = (PROV_DSA_CTX )vpdsactx;
412	0	PROV_DSA_CTX *dstctx;
413
414	0	if (!ossl_prov_is_running())
415	0	return NULL;
416
417	0	dstctx = OPENSSL_zalloc(sizeof(*srcctx));
418	0	if (dstctx == NULL)
419	0	return NULL;
420
421	0	dstctx = srcctx;
422	0	dstctx->dsa = NULL;
423	0	dstctx->md = NULL;
424	0	dstctx->mdctx = NULL;
425	0	dstctx->propq = NULL;
426
427	0	if (srcctx->dsa != NULL && !DSA_up_ref(srcctx->dsa))
428	0	goto err;
429	0	dstctx->dsa = srcctx->dsa;
430
431	0	if (srcctx->md != NULL && !EVP_MD_up_ref(srcctx->md))
432	0	goto err;
433	0	dstctx->md = srcctx->md;
434
435	0	if (srcctx->mdctx != NULL) {
436	0	dstctx->mdctx = EVP_MD_CTX_new();
437	0	if (dstctx->mdctx == NULL
438	0	\|\| !EVP_MD_CTX_copy_ex(dstctx->mdctx, srcctx->mdctx))
439	0	goto err;
440	0	}
441	0	if (srcctx->propq != NULL) {
442	0	dstctx->propq = OPENSSL_strdup(srcctx->propq);
443	0	if (dstctx->propq == NULL)
444	0	goto err;
445	0	}
446
447	0	return dstctx;
448	0	err:
449	0	dsa_freectx(dstctx);
450	0	return NULL;
451	0	}
452
453		static int dsa_get_ctx_params(void vpdsactx, OSSL_PARAM params)
454	0	{
455	0	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
456	0	OSSL_PARAM *p;
457
458	0	if (pdsactx == NULL)
459	0	return 0;
460
461	0	p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_ALGORITHM_ID);
462	0	if (p != NULL
463	0	&& !OSSL_PARAM_set_octet_string(p, pdsactx->aid, pdsactx->aid_len))
464	0	return 0;
465
466	0	p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_DIGEST);
467	0	if (p != NULL && !OSSL_PARAM_set_utf8_string(p, pdsactx->mdname))
468	0	return 0;
469
470	0	p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_NONCE_TYPE);
471	0	if (p != NULL && !OSSL_PARAM_set_uint(p, pdsactx->nonce_type))
472	0	return 0;
473
474	0	return 1;
475	0	}
476
477		static const OSSL_PARAM known_gettable_ctx_params[] = {
478		OSSL_PARAM_octet_string(OSSL_SIGNATURE_PARAM_ALGORITHM_ID, NULL, 0),
479		OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
480		OSSL_PARAM_uint(OSSL_SIGNATURE_PARAM_NONCE_TYPE, NULL),
481		OSSL_PARAM_END
482		};
483
484		static const OSSL_PARAM dsa_gettable_ctx_params(ossl_unused void ctx,
485		ossl_unused void *provctx)
486	0	{
487	0	return known_gettable_ctx_params;
488	0	}
489
490		static int dsa_set_ctx_params(void *vpdsactx, const OSSL_PARAM params[])
491	0	{
492	0	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
493	0	const OSSL_PARAM *p;
494
495	0	if (pdsactx == NULL)
496	0	return 0;
497	0	if (params == NULL)
498	0	return 1;
499
500	0	p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST);
501	0	if (p != NULL) {
502	0	char mdname[OSSL_MAX_NAME_SIZE] = "", *pmdname = mdname;
503	0	char mdprops[OSSL_MAX_PROPQUERY_SIZE] = "", *pmdprops = mdprops;
504	0	const OSSL_PARAM *propsp =
505	0	OSSL_PARAM_locate_const(params,
506	0	OSSL_SIGNATURE_PARAM_PROPERTIES);
507
508	0	if (!OSSL_PARAM_get_utf8_string(p, &pmdname, sizeof(mdname)))
509	0	return 0;
510	0	if (propsp != NULL
511	0	&& !OSSL_PARAM_get_utf8_string(propsp, &pmdprops, sizeof(mdprops)))
512	0	return 0;
513	0	if (!dsa_setup_md(pdsactx, mdname, mdprops))
514	0	return 0;
515	0	}
516	0	p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_NONCE_TYPE);
517	0	if (p != NULL
518	0	&& !OSSL_PARAM_get_uint(p, &pdsactx->nonce_type))
519	0	return 0;
520
521	0	return 1;
522	0	}
523
524		static const OSSL_PARAM settable_ctx_params[] = {
525		OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
526		OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PROPERTIES, NULL, 0),
527		OSSL_PARAM_uint(OSSL_SIGNATURE_PARAM_NONCE_TYPE, NULL),
528		OSSL_PARAM_END
529		};
530
531		static const OSSL_PARAM settable_ctx_params_no_digest[] = {
532		OSSL_PARAM_END
533		};
534
535		static const OSSL_PARAM dsa_settable_ctx_params(void vpdsactx,
536		ossl_unused void *provctx)
537	0	{
538	0	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
539
540	0	if (pdsactx != NULL && !pdsactx->flag_allow_md)
541	0	return settable_ctx_params_no_digest;
542	0	return settable_ctx_params;
543	0	}
544
545		static int dsa_get_ctx_md_params(void vpdsactx, 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_get_params(pdsactx->mdctx, params);
553	0	}
554
555		static const OSSL_PARAM dsa_gettable_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_gettable_ctx_params(pdsactx->md);
563	0	}
564
565		static int dsa_set_ctx_md_params(void *vpdsactx, const OSSL_PARAM params[])
566	0	{
567	0	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
568
569	0	if (pdsactx->mdctx == NULL)
570	0	return 0;
571
572	0	return EVP_MD_CTX_set_params(pdsactx->mdctx, params);
573	0	}
574
575		static const OSSL_PARAM dsa_settable_ctx_md_params(void vpdsactx)
576	0	{
577	0	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
578
579	0	if (pdsactx->md == NULL)
580	0	return 0;
581
582	0	return EVP_MD_settable_ctx_params(pdsactx->md);
583	0	}
584
585		const OSSL_DISPATCH ossl_dsa_signature_functions[] = {
586		{ OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))dsa_newctx },
587		{ OSSL_FUNC_SIGNATURE_SIGN_INIT, (void (*)(void))dsa_sign_init },
588		{ OSSL_FUNC_SIGNATURE_SIGN, (void (*)(void))dsa_sign },
589		{ OSSL_FUNC_SIGNATURE_VERIFY_INIT, (void (*)(void))dsa_verify_init },
590		{ OSSL_FUNC_SIGNATURE_VERIFY, (void (*)(void))dsa_verify },
591		{ OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT,
592		(void (*)(void))dsa_digest_sign_init },
593		{ OSSL_FUNC_SIGNATURE_DIGEST_SIGN_UPDATE,
594		(void (*)(void))dsa_digest_signverify_update },
595		{ OSSL_FUNC_SIGNATURE_DIGEST_SIGN_FINAL,
596		(void (*)(void))dsa_digest_sign_final },
597		{ OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_INIT,
598		(void (*)(void))dsa_digest_verify_init },
599		{ OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_UPDATE,
600		(void (*)(void))dsa_digest_signverify_update },
601		{ OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_FINAL,
602		(void (*)(void))dsa_digest_verify_final },
603		{ OSSL_FUNC_SIGNATURE_FREECTX, (void (*)(void))dsa_freectx },
604		{ OSSL_FUNC_SIGNATURE_DUPCTX, (void (*)(void))dsa_dupctx },
605		{ OSSL_FUNC_SIGNATURE_GET_CTX_PARAMS, (void (*)(void))dsa_get_ctx_params },
606		{ OSSL_FUNC_SIGNATURE_GETTABLE_CTX_PARAMS,
607		(void (*)(void))dsa_gettable_ctx_params },
608		{ OSSL_FUNC_SIGNATURE_SET_CTX_PARAMS, (void (*)(void))dsa_set_ctx_params },
609		{ OSSL_FUNC_SIGNATURE_SETTABLE_CTX_PARAMS,
610		(void (*)(void))dsa_settable_ctx_params },
611		{ OSSL_FUNC_SIGNATURE_GET_CTX_MD_PARAMS,
612		(void (*)(void))dsa_get_ctx_md_params },
613		{ OSSL_FUNC_SIGNATURE_GETTABLE_CTX_MD_PARAMS,
614		(void (*)(void))dsa_gettable_ctx_md_params },
615		{ OSSL_FUNC_SIGNATURE_SET_CTX_MD_PARAMS,
616		(void (*)(void))dsa_set_ctx_md_params },
617		{ OSSL_FUNC_SIGNATURE_SETTABLE_CTX_MD_PARAMS,
618		(void (*)(void))dsa_settable_ctx_md_params },
619		OSSL_DISPATCH_END
620		};