EC_KEY *ec;
char mdname[OSSL_MAX_NAME_SIZE];
+ /*
+ * 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;
+
/* The Algorithm Identifier of the combined signature algorithm */
unsigned char aid_buf[OSSL_MAX_ALGORITHM_ID_SIZE];
unsigned char *aid;
if (ctx == NULL)
return NULL;
+ ctx->flag_allow_md = 1;
ctx->libctx = PROV_LIBCTX_OF(provctx);
if (propq != NULL && (ctx->propq = OPENSSL_strdup(propq)) == NULL) {
OPENSSL_free(ctx);
return ECDSA_verify(0, tbs, tbslen, sig, siglen, ctx->ec);
}
-static void free_md(PROV_ECDSA_CTX *ctx)
+static int ecdsa_setup_md(PROV_ECDSA_CTX *ctx, const char *mdname,
+ const char *mdprops)
{
- OPENSSL_free(ctx->propq);
+ EVP_MD *md = NULL;
+ size_t mdname_len;
+ int md_nid, sha1_allowed;
+ WPACKET pkt;
+
+ if (mdname == NULL)
+ return 1;
+
+ mdname_len = strlen(mdname);
+ if (mdname_len >= sizeof(ctx->mdname)) {
+ ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
+ "%s exceeds name buffer length", mdname);
+ return 0;
+ }
+ if (mdprops == NULL)
+ mdprops = ctx->propq;
+ md = EVP_MD_fetch(ctx->libctx, mdname, mdprops);
+ if (md == NULL) {
+ ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
+ "%s could not be fetched", mdname);
+ return 0;
+ }
+ sha1_allowed = (ctx->operation != EVP_PKEY_OP_SIGN);
+ md_nid = digest_get_approved_nid_with_sha1(md, sha1_allowed);
+ if (md_nid == NID_undef) {
+ ERR_raise_data(ERR_LIB_PROV, PROV_R_DIGEST_NOT_ALLOWED,
+ "digest=%s", mdname);
+ EVP_MD_free(md);
+ return 0;
+ }
+
EVP_MD_CTX_free(ctx->mdctx);
EVP_MD_free(ctx->md);
- ctx->propq = NULL;
+
+ ctx->aid_len = 0;
+ if (WPACKET_init_der(&pkt, ctx->aid_buf, sizeof(ctx->aid_buf))
+ && ossl_DER_w_algorithmIdentifier_ECDSA_with_MD(&pkt, -1, ctx->ec,
+ 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 = NULL;
- ctx->mdsize = 0;
+ ctx->md = md;
+ ctx->mdsize = EVP_MD_size(ctx->md);
+ OPENSSL_strlcpy(ctx->mdname, mdname, sizeof(ctx->mdname));
+
+ return 1;
}
static int ecdsa_digest_signverify_init(void *vctx, const char *mdname,
void *ec, int operation)
{
PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
- int md_nid = NID_undef;
- WPACKET pkt;
- int sha1_allowed = (ctx->operation != EVP_PKEY_OP_SIGN);
if (!ossl_prov_is_running())
return 0;
- free_md(ctx);
-
- if (!ecdsa_signverify_init(vctx, ec, operation))
+ ctx->flag_allow_md = 0;
+ if (!ecdsa_signverify_init(vctx, ec, operation)
+ || !ecdsa_setup_md(ctx, mdname, NULL))
return 0;
- ctx->md = EVP_MD_fetch(ctx->libctx, mdname, ctx->propq);
- md_nid = digest_get_approved_nid_with_sha1(ctx->md, sha1_allowed);
- if (md_nid == NID_undef)
- goto error;
-
- ctx->mdsize = EVP_MD_size(ctx->md);
ctx->mdctx = EVP_MD_CTX_new();
if (ctx->mdctx == NULL)
goto error;
- /*
- * 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))
- && ossl_DER_w_algorithmIdentifier_ECDSA_with_MD(&pkt, -1, ctx->ec,
- md_nid)
- && WPACKET_finish(&pkt)) {
- WPACKET_get_total_written(&pkt, &ctx->aid_len);
- ctx->aid = WPACKET_get_curr(&pkt);
- }
- WPACKET_cleanup(&pkt);
-
if (!EVP_DigestInit_ex(ctx->mdctx, ctx->md, NULL))
goto error;
return 1;
error:
- free_md(ctx);
+ EVP_MD_CTX_free(ctx->mdctx);
+ EVP_MD_free(ctx->md);
+ ctx->mdctx = NULL;
+ ctx->md = NULL;
return 0;
}
* If sig is NULL then we're just finding out the sig size. Other fields
* are ignored. Defer to ecdsa_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(ctx->mdctx, digest, &dlen))
- return 0;
- }
-
+ if (sig != NULL
+ && !EVP_DigestFinal_ex(ctx->mdctx, digest, &dlen))
+ return 0;
+ ctx->flag_allow_md = 1;
return ecdsa_sign(vctx, sig, siglen, sigsize, digest, (size_t)dlen);
}
if (!ossl_prov_is_running() || ctx == NULL || ctx->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(ctx->mdctx, digest, &dlen))
return 0;
-
+ ctx->flag_allow_md = 1;
return ecdsa_verify(ctx, sig, siglen, digest, (size_t)dlen);
}
{
PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
- free_md(ctx);
+ OPENSSL_free(ctx->propq);
+ EVP_MD_CTX_free(ctx->mdctx);
+ EVP_MD_free(ctx->md);
+ ctx->propq = NULL;
+ ctx->mdctx = NULL;
+ ctx->md = NULL;
+ ctx->mdsize = 0;
EC_KEY_free(ctx->ec);
BN_clear_free(ctx->kinv);
BN_clear_free(ctx->r);
dstctx->ec = NULL;
dstctx->md = NULL;
dstctx->mdctx = NULL;
+ dstctx->propq = NULL;
if (srcctx->ec != NULL && !EC_KEY_up_ref(srcctx->ec))
goto err;
goto err;
}
+ if (srcctx->propq != NULL) {
+ dstctx->propq = OPENSSL_strdup(srcctx->propq);
+ if (dstctx->propq == NULL)
+ goto err;
+ }
+
return dstctx;
err:
ecdsa_freectx(dstctx);
{
PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
const OSSL_PARAM *p;
- char *mdname;
if (ctx == NULL || params == NULL)
return 0;
- if (ctx->md != NULL) {
- /*
- * You cannot set the digest name/size when doing a DigestSign or
- * DigestVerify.
- */
- return 1;
- }
#if !defined(OPENSSL_NO_ACVP_TESTS)
p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_KAT);
if (p != NULL && !OSSL_PARAM_get_uint(p, &ctx->kattest))
return 0;
#endif
- p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST_SIZE);
- if (p != NULL && !OSSL_PARAM_get_size_t(p, &ctx->mdsize))
+ p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST);
+ /* Not allowed during certain operations */
+ if (p != NULL && !ctx->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 (!ecdsa_setup_md(ctx, mdname, mdprops))
+ 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 = ctx->mdname;
+ p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST_SIZE);
if (p != NULL
- && !OSSL_PARAM_get_utf8_string(p, &mdname, sizeof(ctx->mdname)))
+ && (!ctx->flag_allow_md
+ || !OSSL_PARAM_get_size_t(p, &ctx->mdsize)))
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_utf8_string(OSSL_SIGNATURE_PARAM_PROPERTIES, NULL, 0),
OSSL_PARAM_uint(OSSL_SIGNATURE_PARAM_KAT, NULL),
OSSL_PARAM_END
};
static const OSSL_PARAM *ecdsa_settable_ctx_params(ossl_unused void *provctx)
{
- /*
- * 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;
}