[thirdparty/openssl.git] / providers / implementations / signature / dsa.c

/*
 * Copyright 2019 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
 */

#include <string.h>

#include <openssl/crypto.h>
#include <openssl/core_numbers.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 "internal/nelem.h"
#include "internal/sizes.h"
#include "prov/providercommonerr.h"
#include "prov/implementations.h"
#include "prov/providercommonerr.h"
#include "prov/provider_ctx.h"
#include "crypto/dsa.h"

static OSSL_OP_signature_newctx_fn dsa_newctx;
static OSSL_OP_signature_sign_init_fn dsa_signature_init;
static OSSL_OP_signature_verify_init_fn dsa_signature_init;
static OSSL_OP_signature_sign_fn dsa_sign;
static OSSL_OP_signature_verify_fn dsa_verify;
static OSSL_OP_signature_digest_sign_init_fn dsa_digest_signverify_init;
static OSSL_OP_signature_digest_sign_update_fn dsa_digest_signverify_update;
static OSSL_OP_signature_digest_sign_final_fn dsa_digest_sign_final;
static OSSL_OP_signature_digest_verify_init_fn dsa_digest_signverify_init;
static OSSL_OP_signature_digest_verify_update_fn dsa_digest_signverify_update;
static OSSL_OP_signature_digest_verify_final_fn dsa_digest_verify_final;
static OSSL_OP_signature_freectx_fn dsa_freectx;
static OSSL_OP_signature_dupctx_fn dsa_dupctx;
static OSSL_OP_signature_get_ctx_params_fn dsa_get_ctx_params;
static OSSL_OP_signature_gettable_ctx_params_fn dsa_gettable_ctx_params;
static OSSL_OP_signature_set_ctx_params_fn dsa_set_ctx_params;
static OSSL_OP_signature_settable_ctx_params_fn dsa_settable_ctx_params;
static OSSL_OP_signature_get_ctx_md_params_fn dsa_get_ctx_md_params;
static OSSL_OP_signature_gettable_ctx_md_params_fn dsa_gettable_ctx_md_params;
static OSSL_OP_signature_set_ctx_md_params_fn dsa_set_ctx_md_params;
static OSSL_OP_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 {
    OPENSSL_CTX *libctx;
    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 agorithm */
    unsigned char aid[OSSL_MAX_ALGORITHM_ID_SIZE];
    size_t  aid_len;

    /* main digest */
    EVP_MD *md;
    EVP_MD_CTX *mdctx;
    size_t mdsize;
} PROV_DSA_CTX;

static size_t dsa_get_md_size(const PROV_DSA_CTX *pdsactx)
{
    if (pdsactx->md != NULL)
        return EVP_MD_size(pdsactx->md);
    return 0;
}

static int dsa_get_md_nid(const EVP_MD *md)
{
    /*
     * Because the DSA library deals with NIDs, we need to translate.
     * We do so using EVP_MD_is_a(), and therefore need a name to NID
     * map.
     */
    static const OSSL_ITEM name_to_nid[] = {
        { NID_sha1,   OSSL_DIGEST_NAME_SHA1   },
        { NID_sha224, OSSL_DIGEST_NAME_SHA2_224 },
        { NID_sha256, OSSL_DIGEST_NAME_SHA2_256 },
        { NID_sha384, OSSL_DIGEST_NAME_SHA2_384 },
        { NID_sha512, OSSL_DIGEST_NAME_SHA2_512 },
        { NID_sha3_224, OSSL_DIGEST_NAME_SHA3_224 },
        { NID_sha3_256, OSSL_DIGEST_NAME_SHA3_256 },
        { NID_sha3_384, OSSL_DIGEST_NAME_SHA3_384 },
        { NID_sha3_512, OSSL_DIGEST_NAME_SHA3_512 },
    };
    size_t i;
    int mdnid = NID_undef;

    if (md == NULL)
        goto end;

    for (i = 0; i < OSSL_NELEM(name_to_nid); i++) {
        if (EVP_MD_is_a(md, name_to_nid[i].ptr)) {
            mdnid = (int)name_to_nid[i].id;
            break;
        }
    }

    if (mdnid == NID_undef)
        ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_DIGEST);

 end:
    return mdnid;
}

static void *dsa_newctx(void *provctx)
{
    PROV_DSA_CTX *pdsactx = OPENSSL_zalloc(sizeof(PROV_DSA_CTX));

    if (pdsactx == NULL)
        return NULL;

    pdsactx->libctx = PROV_LIBRARY_CONTEXT_OF(provctx);
    pdsactx->flag_allow_md = 1;
    return pdsactx;
}

static int dsa_setup_md(PROV_DSA_CTX *ctx,
                        const char *mdname, const char *mdprops)
{
    if (mdname != NULL) {
        EVP_MD *md = EVP_MD_fetch(ctx->libctx, mdname, mdprops);
        int md_nid = dsa_get_md_nid(md);
        size_t algorithmidentifier_len = 0;
        const unsigned char *algorithmidentifier;

        EVP_MD_free(ctx->md);
        ctx->md = NULL;
        ctx->mdname[0] = '\0';

        algorithmidentifier =
            dsa_algorithmidentifier_encoding(md_nid, &algorithmidentifier_len);

        if (algorithmidentifier == NULL) {
            EVP_MD_free(md);
            return 0;
        }

        ctx->md = md;
        OPENSSL_strlcpy(ctx->mdname, mdname, sizeof(ctx->mdname));
        memcpy(ctx->aid, algorithmidentifier, algorithmidentifier_len);
        ctx->aid_len = algorithmidentifier_len;
    }
    return 1;
}

static int dsa_signature_init(void *vpdsactx, void *vdsa)
{
    PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;

    if (pdsactx == NULL || vdsa == NULL || !DSA_up_ref(vdsa))
        return 0;
    DSA_free(pdsactx->dsa);
    pdsactx->dsa = vdsa;
    return 1;
}

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

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

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

    ret = dsa_sign_int(pdsactx->libctx, 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 (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,
                                      const char *props, void *vdsa)
{
    PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;

    pdsactx->flag_allow_md = 0;
    if (!dsa_signature_init(vpdsactx, vdsa))
        return 0;

    if (!dsa_setup_md(pdsactx, mdname, props))
        return 0;

    pdsactx->mdctx = EVP_MD_CTX_new();
    if (pdsactx->mdctx == NULL)
        goto error;

    if (!EVP_DigestInit_ex(pdsactx->mdctx, pdsactx->md, NULL))
        goto error;

    return 1;

 error:
    EVP_MD_CTX_free(pdsactx->mdctx);
    EVP_MD_free(pdsactx->md);
    pdsactx->mdctx = NULL;
    pdsactx->md = NULL;
    return 0;
}

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 (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) {
        /*
         * TODO(3.0): 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_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 (pdsactx == NULL || pdsactx->mdctx == NULL)
        return 0;

    /*
     * TODO(3.0): 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 *pdsactx = (PROV_DSA_CTX *)vpdsactx;

    DSA_free(pdsactx->dsa);
    EVP_MD_CTX_free(pdsactx->mdctx);
    EVP_MD_free(pdsactx->md);

    OPENSSL_free(pdsactx);
}

static void *dsa_dupctx(void *vpdsactx)
{
    PROV_DSA_CTX *srcctx = (PROV_DSA_CTX *)vpdsactx;
    PROV_DSA_CTX *dstctx;

    dstctx = OPENSSL_zalloc(sizeof(*srcctx));
    if (dstctx == NULL)
        return NULL;

    *dstctx = *srcctx;
    dstctx->dsa = NULL;
    dstctx->md = NULL;
    dstctx->mdctx = 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;
    }

    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 || params == 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(void)
{
    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 || params == NULL)
        return 0;

    p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST);
    /* Not allowed during certain operations */
    if (p != NULL && !pdsactx->flag_allow_md)
        return 0;
    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 known_settable_ctx_params[] = {
    OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
    OSSL_PARAM_END
};

static const OSSL_PARAM *dsa_settable_ctx_params(void)
{
    /*
     * TODO(3.0): Should this function return a different set of settable ctx
     * params if the ctx is being used for a DigestSign/DigestVerify? In that
     * case it is not allowed to set the digest size/digest name because the
     * digest is explicitly set as part of the init.
     */
    return known_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 dsa_signature_functions[] = {
    { OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))dsa_newctx },
    { OSSL_FUNC_SIGNATURE_SIGN_INIT, (void (*)(void))dsa_signature_init },
    { OSSL_FUNC_SIGNATURE_SIGN, (void (*)(void))dsa_sign },
    { OSSL_FUNC_SIGNATURE_VERIFY_INIT, (void (*)(void))dsa_signature_init },
    { OSSL_FUNC_SIGNATURE_VERIFY, (void (*)(void))dsa_verify },
    { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT,
      (void (*)(void))dsa_digest_signverify_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_signverify_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 }
};
Commit	Line	Data
4889dadc MC	1	/*
	2	* Copyright 2019 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
505b41fc RL	10	#include <string.h>
505b41fc RL	11
4889dadc MC	12	#include <openssl/crypto.h>
	13	#include <openssl/core_numbers.h>
	14	#include <openssl/core_names.h>
505b41fc	15	#include <openssl/err.h>
4889dadc MC	16	#include <openssl/dsa.h>
4889dadc MC	17	#include <openssl/params.h>
45a845e4	18	#include <openssl/evp.h>
8bee6512	19	#include <openssl/err.h>
505b41fc	20	#include "internal/nelem.h"
c24937d5	21	#include "internal/sizes.h"
505b41fc	22	#include "prov/providercommonerr.h"
af3e7e1b	23	#include "prov/implementations.h"
8bee6512	24	#include "prov/providercommonerr.h"
ddd21319	25	#include "prov/provider_ctx.h"
e683582b	26	#include "crypto/dsa.h"
4889dadc MC	27
4889dadc MC	28	static OSSL_OP_signature_newctx_fn dsa_newctx;
390acbeb MC	29	static OSSL_OP_signature_sign_init_fn dsa_signature_init;
390acbeb MC	30	static OSSL_OP_signature_verify_init_fn dsa_signature_init;
4889dadc	31	static OSSL_OP_signature_sign_fn dsa_sign;
45a845e4 MC	32	static OSSL_OP_signature_verify_fn dsa_verify;
	33	static OSSL_OP_signature_digest_sign_init_fn dsa_digest_signverify_init;
	34	static OSSL_OP_signature_digest_sign_update_fn dsa_digest_signverify_update;
	35	static OSSL_OP_signature_digest_sign_final_fn dsa_digest_sign_final;
	36	static OSSL_OP_signature_digest_verify_init_fn dsa_digest_signverify_init;
	37	static OSSL_OP_signature_digest_verify_update_fn dsa_digest_signverify_update;
	38	static OSSL_OP_signature_digest_verify_final_fn dsa_digest_verify_final;
4889dadc MC	39	static OSSL_OP_signature_freectx_fn dsa_freectx;
4889dadc MC	40	static OSSL_OP_signature_dupctx_fn dsa_dupctx;
9c45222d MC	41	static OSSL_OP_signature_get_ctx_params_fn dsa_get_ctx_params;
	42	static OSSL_OP_signature_gettable_ctx_params_fn dsa_gettable_ctx_params;
	43	static OSSL_OP_signature_set_ctx_params_fn dsa_set_ctx_params;
	44	static OSSL_OP_signature_settable_ctx_params_fn dsa_settable_ctx_params;
45a845e4 MC	45	static OSSL_OP_signature_get_ctx_md_params_fn dsa_get_ctx_md_params;
	46	static OSSL_OP_signature_gettable_ctx_md_params_fn dsa_gettable_ctx_md_params;
	47	static OSSL_OP_signature_set_ctx_md_params_fn dsa_set_ctx_md_params;
	48	static OSSL_OP_signature_settable_ctx_md_params_fn dsa_settable_ctx_md_params;
4889dadc MC	49
	50	/*
	51	* What's passed as an actual key is defined by the KEYMGMT interface.
	52	* We happen to know that our KEYMGMT simply passes DSA structures, so
	53	* we use that here too.
	54	*/
	55
	56	typedef struct {
45a845e4	57	OPENSSL_CTX *libctx;
4889dadc	58	DSA *dsa;
8bee6512 RL	59
	60	/*
	61	* Flag to determine if the hash function can be changed (1) or not (0)
	62	* Because it's dangerous to change during a DigestSign or DigestVerify
	63	* operation, this flag is cleared by their Init function, and set again
	64	* by their Final function.
	65	*/
	66	unsigned int flag_allow_md : 1;
	67
c24937d5	68	char mdname[OSSL_MAX_NAME_SIZE];
505b41fc RL	69
	70	/* The Algorithm Identifier of the combined signature agorithm */
	71	unsigned char aid[OSSL_MAX_ALGORITHM_ID_SIZE];
	72	size_t aid_len;
	73
	74	/* main digest */
45a845e4 MC	75	EVP_MD *md;
45a845e4 MC	76	EVP_MD_CTX *mdctx;
8bee6512	77	size_t mdsize;
4889dadc MC	78	} PROV_DSA_CTX;
4889dadc MC	79
8bee6512 RL	80	static size_t dsa_get_md_size(const PROV_DSA_CTX *pdsactx)
	81	{
	82	if (pdsactx->md != NULL)
	83	return EVP_MD_size(pdsactx->md);
	84	return 0;
	85	}
	86
	87	static int dsa_get_md_nid(const EVP_MD *md)
	88	{
	89	/*
	90	* Because the DSA library deals with NIDs, we need to translate.
	91	* We do so using EVP_MD_is_a(), and therefore need a name to NID
	92	* map.
	93	*/
	94	static const OSSL_ITEM name_to_nid[] = {
	95	{ NID_sha1, OSSL_DIGEST_NAME_SHA1 },
	96	{ NID_sha224, OSSL_DIGEST_NAME_SHA2_224 },
	97	{ NID_sha256, OSSL_DIGEST_NAME_SHA2_256 },
	98	{ NID_sha384, OSSL_DIGEST_NAME_SHA2_384 },
	99	{ NID_sha512, OSSL_DIGEST_NAME_SHA2_512 },
	100	{ NID_sha3_224, OSSL_DIGEST_NAME_SHA3_224 },
	101	{ NID_sha3_256, OSSL_DIGEST_NAME_SHA3_256 },
	102	{ NID_sha3_384, OSSL_DIGEST_NAME_SHA3_384 },
	103	{ NID_sha3_512, OSSL_DIGEST_NAME_SHA3_512 },
	104	};
	105	size_t i;
	106	int mdnid = NID_undef;
	107
	108	if (md == NULL)
	109	goto end;
	110
	111	for (i = 0; i < OSSL_NELEM(name_to_nid); i++) {
	112	if (EVP_MD_is_a(md, name_to_nid[i].ptr)) {
	113	mdnid = (int)name_to_nid[i].id;
	114	break;
	115	}
	116	}
	117
	118	if (mdnid == NID_undef)
	119	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_DIGEST);
	120
	121	end:
	122	return mdnid;
	123	}
	124
4889dadc MC	125	static void dsa_newctx(void provctx)
4889dadc MC	126	{
45a845e4 MC	127	PROV_DSA_CTX *pdsactx = OPENSSL_zalloc(sizeof(PROV_DSA_CTX));
	128
	129	if (pdsactx == NULL)
	130	return NULL;
	131
	132	pdsactx->libctx = PROV_LIBRARY_CONTEXT_OF(provctx);
8bee6512	133	pdsactx->flag_allow_md = 1;
45a845e4	134	return pdsactx;
4889dadc MC	135	}
4889dadc MC	136
8bee6512 RL	137	static int dsa_setup_md(PROV_DSA_CTX *ctx,
	138	const char mdname, const char mdprops)
	139	{
	140	if (mdname != NULL) {
	141	EVP_MD *md = EVP_MD_fetch(ctx->libctx, mdname, mdprops);
	142	int md_nid = dsa_get_md_nid(md);
	143	size_t algorithmidentifier_len = 0;
	144	const unsigned char *algorithmidentifier;
	145
	146	EVP_MD_free(ctx->md);
	147	ctx->md = NULL;
	148	ctx->mdname[0] = '\0';
	149
	150	algorithmidentifier =
	151	dsa_algorithmidentifier_encoding(md_nid, &algorithmidentifier_len);
	152
	153	if (algorithmidentifier == NULL) {
	154	EVP_MD_free(md);
	155	return 0;
	156	}
	157
	158	ctx->md = md;
	159	OPENSSL_strlcpy(ctx->mdname, mdname, sizeof(ctx->mdname));
b0593c08 RL	160	memcpy(ctx->aid, algorithmidentifier, algorithmidentifier_len);
b0593c08 RL	161	ctx->aid_len = algorithmidentifier_len;
8bee6512 RL	162	}
	163	return 1;
	164	}
	165
390acbeb	166	static int dsa_signature_init(void vpdsactx, void vdsa)
4889dadc MC	167	{
	168	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
	169
	170	if (pdsactx == NULL \|\| vdsa == NULL \|\| !DSA_up_ref(vdsa))
	171	return 0;
	172	DSA_free(pdsactx->dsa);
	173	pdsactx->dsa = vdsa;
	174	return 1;
	175	}
	176
	177	static int dsa_sign(void vpdsactx, unsigned char sig, size_t *siglen,
	178	size_t sigsize, const unsigned char *tbs, size_t tbslen)
	179	{
	180	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
	181	int ret;
	182	unsigned int sltmp;
	183	size_t dsasize = DSA_size(pdsactx->dsa);
8bee6512	184	size_t mdsize = dsa_get_md_size(pdsactx);
4889dadc MC	185
	186	if (sig == NULL) {
	187	*siglen = dsasize;
	188	return 1;
	189	}
	190
	191	if (sigsize < (size_t)dsasize)
	192	return 0;
	193
8bee6512	194	if (mdsize != 0 && tbslen != mdsize)
4889dadc MC	195	return 0;
4889dadc MC	196
e683582b SL	197	ret = dsa_sign_int(pdsactx->libctx, 0, tbs, tbslen, sig, &sltmp,
e683582b SL	198	pdsactx->dsa);
4889dadc MC	199	if (ret <= 0)
	200	return 0;
	201
	202	*siglen = sltmp;
	203	return 1;
	204	}
	205
390acbeb MC	206	static int dsa_verify(void vpdsactx, const unsigned char sig, size_t siglen,
	207	const unsigned char *tbs, size_t tbslen)
	208	{
	209	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
8bee6512	210	size_t mdsize = dsa_get_md_size(pdsactx);
390acbeb	211
8bee6512	212	if (mdsize != 0 && tbslen != mdsize)
390acbeb MC	213	return 0;
	214
	215	return DSA_verify(0, tbs, tbslen, sig, siglen, pdsactx->dsa);
	216	}
	217
45a845e4 MC	218	static int dsa_digest_signverify_init(void vpdsactx, const char mdname,
	219	const char props, void vdsa)
	220	{
	221	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
45a845e4	222
8bee6512	223	pdsactx->flag_allow_md = 0;
45a845e4 MC	224	if (!dsa_signature_init(vpdsactx, vdsa))
	225	return 0;
	226
8bee6512 RL	227	if (!dsa_setup_md(pdsactx, mdname, props))
8bee6512 RL	228	return 0;
505b41fc	229
45a845e4 MC	230	pdsactx->mdctx = EVP_MD_CTX_new();
45a845e4 MC	231	if (pdsactx->mdctx == NULL)
505b41fc	232	goto error;
45a845e4	233
505b41fc RL	234	if (!EVP_DigestInit_ex(pdsactx->mdctx, pdsactx->md, NULL))
505b41fc RL	235	goto error;
45a845e4 MC	236
45a845e4 MC	237	return 1;
505b41fc RL	238
	239	error:
	240	EVP_MD_CTX_free(pdsactx->mdctx);
	241	EVP_MD_free(pdsactx->md);
	242	pdsactx->mdctx = NULL;
505b41fc RL	243	pdsactx->md = NULL;
505b41fc RL	244	return 0;
45a845e4 MC	245	}
	246
	247	int dsa_digest_signverify_update(void vpdsactx, const unsigned char data,
	248	size_t datalen)
	249	{
	250	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
	251
	252	if (pdsactx == NULL \|\| pdsactx->mdctx == NULL)
	253	return 0;
	254
	255	return EVP_DigestUpdate(pdsactx->mdctx, data, datalen);
	256	}
	257
	258	int dsa_digest_sign_final(void vpdsactx, unsigned char sig, size_t *siglen,
	259	size_t sigsize)
	260	{
	261	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
	262	unsigned char digest[EVP_MAX_MD_SIZE];
	263	unsigned int dlen = 0;
	264
	265	if (pdsactx == NULL \|\| pdsactx->mdctx == NULL)
	266	return 0;
	267
	268	/*
	269	* If sig is NULL then we're just finding out the sig size. Other fields
	270	* are ignored. Defer to dsa_sign.
	271	*/
	272	if (sig != NULL) {
	273	/*
	274	* TODO(3.0): There is the possibility that some externally provided
	275	* digests exceed EVP_MAX_MD_SIZE. We should probably handle that somehow -
	276	* but that problem is much larger than just in DSA.
	277	*/
	278	if (!EVP_DigestFinal_ex(pdsactx->mdctx, digest, &dlen))
	279	return 0;
	280	}
	281
8bee6512 RL	282	pdsactx->flag_allow_md = 1;
8bee6512 RL	283
45a845e4 MC	284	return dsa_sign(vpdsactx, sig, siglen, sigsize, digest, (size_t)dlen);
	285	}
	286
	287
	288	int dsa_digest_verify_final(void vpdsactx, const unsigned char sig,
	289	size_t siglen)
	290	{
	291	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
	292	unsigned char digest[EVP_MAX_MD_SIZE];
	293	unsigned int dlen = 0;
	294
	295	if (pdsactx == NULL \|\| pdsactx->mdctx == NULL)
	296	return 0;
	297
	298	/*
	299	* TODO(3.0): There is the possibility that some externally provided
	300	* digests exceed EVP_MAX_MD_SIZE. We should probably handle that somehow -
	301	* but that problem is much larger than just in DSA.
	302	*/
	303	if (!EVP_DigestFinal_ex(pdsactx->mdctx, digest, &dlen))
	304	return 0;
	305
8bee6512 RL	306	pdsactx->flag_allow_md = 1;
8bee6512 RL	307
45a845e4 MC	308	return dsa_verify(vpdsactx, sig, siglen, digest, (size_t)dlen);
45a845e4 MC	309	}
390acbeb	310
4889dadc MC	311	static void dsa_freectx(void *vpdsactx)
	312	{
	313	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
	314
	315	DSA_free(pdsactx->dsa);
45a845e4 MC	316	EVP_MD_CTX_free(pdsactx->mdctx);
45a845e4 MC	317	EVP_MD_free(pdsactx->md);
4889dadc MC	318
	319	OPENSSL_free(pdsactx);
	320	}
	321
	322	static void dsa_dupctx(void vpdsactx)
	323	{
	324	PROV_DSA_CTX srcctx = (PROV_DSA_CTX )vpdsactx;
	325	PROV_DSA_CTX *dstctx;
	326
	327	dstctx = OPENSSL_zalloc(sizeof(*srcctx));
	328	if (dstctx == NULL)
	329	return NULL;
	330
	331	dstctx = srcctx;
45a845e4 MC	332	dstctx->dsa = NULL;
	333	dstctx->md = NULL;
	334	dstctx->mdctx = NULL;
	335
	336	if (srcctx->dsa != NULL && !DSA_up_ref(srcctx->dsa))
	337	goto err;
	338	dstctx->dsa = srcctx->dsa;
	339
	340	if (srcctx->md != NULL && !EVP_MD_up_ref(srcctx->md))
	341	goto err;
	342	dstctx->md = srcctx->md;
	343
	344	if (srcctx->mdctx != NULL) {
	345	dstctx->mdctx = EVP_MD_CTX_new();
	346	if (dstctx->mdctx == NULL
	347	\|\| !EVP_MD_CTX_copy_ex(dstctx->mdctx, srcctx->mdctx))
	348	goto err;
4889dadc MC	349	}
	350
	351	return dstctx;
45a845e4 MC	352	err:
	353	dsa_freectx(dstctx);
	354	return NULL;
4889dadc MC	355	}
4889dadc MC	356
9c45222d MC	357	static int dsa_get_ctx_params(void vpdsactx, OSSL_PARAM params)
	358	{
	359	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
	360	OSSL_PARAM *p;
	361
	362	if (pdsactx == NULL \|\| params == NULL)
	363	return 0;
	364
505b41fc RL	365	p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_ALGORITHM_ID);
	366	if (p != NULL
	367	&& !OSSL_PARAM_set_octet_string(p, pdsactx->aid, pdsactx->aid_len))
	368	return 0;
	369
9c45222d	370	p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_DIGEST);
8bee6512	371	if (p != NULL && !OSSL_PARAM_set_utf8_string(p, pdsactx->mdname))
9c45222d MC	372	return 0;
	373
	374	return 1;
	375	}
	376
	377	static const OSSL_PARAM known_gettable_ctx_params[] = {
505b41fc	378	OSSL_PARAM_octet_string(OSSL_SIGNATURE_PARAM_ALGORITHM_ID, NULL, 0),
9c45222d MC	379	OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
	380	OSSL_PARAM_END
	381	};
	382
	383	static const OSSL_PARAM *dsa_gettable_ctx_params(void)
	384	{
	385	return known_gettable_ctx_params;
	386	}
	387
	388	static int dsa_set_ctx_params(void *vpdsactx, const OSSL_PARAM params[])
4889dadc MC	389	{
	390	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
	391	const OSSL_PARAM *p;
4889dadc MC	392
	393	if (pdsactx == NULL \|\| params == NULL)
	394	return 0;
	395
9c45222d	396	p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST);
8bee6512 RL	397	/* Not allowed during certain operations */
8bee6512 RL	398	if (p != NULL && !pdsactx->flag_allow_md)
9c45222d	399	return 0;
8bee6512 RL	400	if (p != NULL) {
	401	char mdname[OSSL_MAX_NAME_SIZE] = "", *pmdname = mdname;
	402	char mdprops[OSSL_MAX_PROPQUERY_SIZE] = "", *pmdprops = mdprops;
	403	const OSSL_PARAM *propsp =
	404	OSSL_PARAM_locate_const(params,
	405	OSSL_SIGNATURE_PARAM_PROPERTIES);
	406
	407	if (!OSSL_PARAM_get_utf8_string(p, &pmdname, sizeof(mdname)))
	408	return 0;
	409	if (propsp != NULL
	410	&& !OSSL_PARAM_get_utf8_string(propsp, &pmdprops, sizeof(mdprops)))
	411	return 0;
	412	if (!dsa_setup_md(pdsactx, mdname, mdprops))
	413	return 0;
	414	}
4889dadc MC	415
	416	return 1;
	417	}
	418
9c45222d	419	static const OSSL_PARAM known_settable_ctx_params[] = {
9c45222d MC	420	OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
	421	OSSL_PARAM_END
	422	};
	423
	424	static const OSSL_PARAM *dsa_settable_ctx_params(void)
	425	{
45a845e4 MC	426	/*
	427	* TODO(3.0): Should this function return a different set of settable ctx
	428	* params if the ctx is being used for a DigestSign/DigestVerify? In that
	429	* case it is not allowed to set the digest size/digest name because the
	430	* digest is explicitly set as part of the init.
	431	*/
9c45222d MC	432	return known_settable_ctx_params;
	433	}
	434
45a845e4 MC	435	static int dsa_get_ctx_md_params(void vpdsactx, OSSL_PARAM params)
	436	{
	437	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
	438
	439	if (pdsactx->mdctx == NULL)
	440	return 0;
	441
	442	return EVP_MD_CTX_get_params(pdsactx->mdctx, params);
	443	}
	444
	445	static const OSSL_PARAM dsa_gettable_ctx_md_params(void vpdsactx)
	446	{
	447	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
	448
	449	if (pdsactx->md == NULL)
	450	return 0;
	451
	452	return EVP_MD_gettable_ctx_params(pdsactx->md);
	453	}
	454
	455	static int dsa_set_ctx_md_params(void *vpdsactx, const OSSL_PARAM params[])
	456	{
	457	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
	458
	459	if (pdsactx->mdctx == NULL)
	460	return 0;
	461
	462	return EVP_MD_CTX_set_params(pdsactx->mdctx, params);
	463	}
	464
	465	static const OSSL_PARAM dsa_settable_ctx_md_params(void vpdsactx)
	466	{
	467	PROV_DSA_CTX pdsactx = (PROV_DSA_CTX )vpdsactx;
	468
	469	if (pdsactx->md == NULL)
	470	return 0;
	471
	472	return EVP_MD_settable_ctx_params(pdsactx->md);
	473	}
	474
4889dadc MC	475	const OSSL_DISPATCH dsa_signature_functions[] = {
4889dadc MC	476	{ OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))dsa_newctx },
390acbeb	477	{ OSSL_FUNC_SIGNATURE_SIGN_INIT, (void (*)(void))dsa_signature_init },
4889dadc	478	{ OSSL_FUNC_SIGNATURE_SIGN, (void (*)(void))dsa_sign },
390acbeb MC	479	{ OSSL_FUNC_SIGNATURE_VERIFY_INIT, (void (*)(void))dsa_signature_init },
390acbeb MC	480	{ OSSL_FUNC_SIGNATURE_VERIFY, (void (*)(void))dsa_verify },
45a845e4 MC	481	{ OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT,
	482	(void (*)(void))dsa_digest_signverify_init },
	483	{ OSSL_FUNC_SIGNATURE_DIGEST_SIGN_UPDATE,
	484	(void (*)(void))dsa_digest_signverify_update },
	485	{ OSSL_FUNC_SIGNATURE_DIGEST_SIGN_FINAL,
	486	(void (*)(void))dsa_digest_sign_final },
	487	{ OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_INIT,
	488	(void (*)(void))dsa_digest_signverify_init },
	489	{ OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_UPDATE,
	490	(void (*)(void))dsa_digest_signverify_update },
	491	{ OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_FINAL,
	492	(void (*)(void))dsa_digest_verify_final },
4889dadc MC	493	{ OSSL_FUNC_SIGNATURE_FREECTX, (void (*)(void))dsa_freectx },
4889dadc MC	494	{ OSSL_FUNC_SIGNATURE_DUPCTX, (void (*)(void))dsa_dupctx },
9c45222d MC	495	{ OSSL_FUNC_SIGNATURE_GET_CTX_PARAMS, (void (*)(void))dsa_get_ctx_params },
	496	{ OSSL_FUNC_SIGNATURE_GETTABLE_CTX_PARAMS,
	497	(void (*)(void))dsa_gettable_ctx_params },
	498	{ OSSL_FUNC_SIGNATURE_SET_CTX_PARAMS, (void (*)(void))dsa_set_ctx_params },
	499	{ OSSL_FUNC_SIGNATURE_SETTABLE_CTX_PARAMS,
	500	(void (*)(void))dsa_settable_ctx_params },
45a845e4 MC	501	{ OSSL_FUNC_SIGNATURE_GET_CTX_MD_PARAMS,
	502	(void (*)(void))dsa_get_ctx_md_params },
	503	{ OSSL_FUNC_SIGNATURE_GETTABLE_CTX_MD_PARAMS,
	504	(void (*)(void))dsa_gettable_ctx_md_params },
	505	{ OSSL_FUNC_SIGNATURE_SET_CTX_MD_PARAMS,
	506	(void (*)(void))dsa_set_ctx_md_params },
	507	{ OSSL_FUNC_SIGNATURE_SETTABLE_CTX_MD_PARAMS,
	508	(void (*)(void))dsa_settable_ctx_md_params },
4889dadc MC	509	{ 0, NULL }
4889dadc MC	510	};