* 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_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 "internal/cryptlib.h"
+#include "prov/providercommonerr.h"
#include "prov/implementations.h"
+#include "prov/providercommonerr.h"
#include "prov/provider_ctx.h"
#include "crypto/dsa.h"
+#include "prov/der_dsa.h"
static OSSL_OP_signature_newctx_fn dsa_newctx;
static OSSL_OP_signature_sign_init_fn dsa_signature_init;
typedef struct {
OPENSSL_CTX *libctx;
DSA *dsa;
- size_t mdsize;
- /* Should be big enough */
- char mdname[80];
+
+ /*
+ * 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;
+ 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));
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);
+ WPACKET pkt;
+
+ if (md == NULL || md_nid == NID_undef) {
+ EVP_MD_free(md);
+ return 0;
+ }
+
+ EVP_MD_CTX_free(ctx->mdctx);
+ EVP_MD_free(ctx->md);
+
+ /*
+ * TODO(3.0) Should we 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))
+ && DER_w_algorithmIdentifier_DSA_with(&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_signature_init(void *vpdsactx, void *vdsa)
{
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;
if (sigsize < (size_t)dsasize)
return 0;
- if (pdsactx->mdsize != 0 && tbslen != pdsactx->mdsize)
+ if (mdsize != 0 && tbslen != mdsize)
return 0;
- ret = dsa_sign_int(pdsactx->libctx, 0, tbs, tbslen, sig, &sltmp,
- pdsactx->dsa);
+ ret = dsa_sign_int(0, tbs, tbslen, sig, &sltmp, pdsactx->dsa);
if (ret <= 0)
return 0;
const unsigned char *tbs, size_t tbslen)
{
PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
+ size_t mdsize = dsa_get_md_size(pdsactx);
- if (pdsactx->mdsize != 0 && tbslen != pdsactx->mdsize)
+ if (mdsize != 0 && tbslen != mdsize)
return 0;
return DSA_verify(0, tbs, tbslen, sig, siglen, pdsactx->dsa);
const char *props, void *vdsa)
{
PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
- EVP_MD *md;
+ pdsactx->flag_allow_md = 0;
if (!dsa_signature_init(vpdsactx, vdsa))
return 0;
- md = EVP_MD_fetch(pdsactx->libctx, mdname, props);
- if (md == NULL)
+ if (!dsa_setup_md(pdsactx, mdname, props))
return 0;
- pdsactx->md = md;
- pdsactx->mdsize = EVP_MD_size(md);
+
pdsactx->mdctx = EVP_MD_CTX_new();
if (pdsactx->mdctx == NULL)
- return 0;
+ goto error;
- if (!EVP_DigestInit_ex(pdsactx->mdctx, md, NULL))
- return 0;
+ 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,
return 0;
}
+ pdsactx->flag_allow_md = 1;
+
return dsa_sign(vpdsactx, sig, siglen, sigsize, digest, (size_t)dlen);
}
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);
}
if (pdsactx == NULL || params == NULL)
return 0;
- p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_DIGEST_SIZE);
- if (p != NULL && !OSSL_PARAM_set_size_t(p, pdsactx->mdsize))
+ 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->md == NULL
- ? pdsactx->mdname
- : EVP_MD_name(pdsactx->md)))
+ 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_size_t(OSSL_SIGNATURE_PARAM_DIGEST_SIZE, NULL),
+ OSSL_PARAM_octet_string(OSSL_SIGNATURE_PARAM_ALGORITHM_ID, NULL, 0),
OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
OSSL_PARAM_END
};
{
PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
const OSSL_PARAM *p;
- char *mdname;
if (pdsactx == NULL || params == NULL)
return 0;
- if (pdsactx->md != NULL) {
- /*
- * You cannot set the digest name/size when doing a DigestSign or
- * DigestVerify.
- */
- return 1;
- }
-
- p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST_SIZE);
- if (p != NULL && !OSSL_PARAM_get_size_t(p, &pdsactx->mdsize))
- return 0;
-
- /*
- * We never actually use the mdname, but we do support getting it later.
- * This can be useful for applications that want to know the MD that they
- * previously set.
- */
p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST);
- mdname = pdsactx->mdname;
- if (p != NULL
- && !OSSL_PARAM_get_utf8_string(p, &mdname, sizeof(pdsactx->mdname)))
+ /* 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_size_t(OSSL_SIGNATURE_PARAM_DIGEST_SIZE, NULL),
OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
OSSL_PARAM_END
};
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