--- /dev/null
+/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
+ * project 2006.
+ */
+/* ====================================================================
+ * Copyright (c) 2006 The OpenSSL Project. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ * software must display the following acknowledgment:
+ * "This product includes software developed by the OpenSSL Project
+ * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ * endorse or promote products derived from this software without
+ * prior written permission. For written permission, please contact
+ * licensing@OpenSSL.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ * nor may "OpenSSL" appear in their names without prior written
+ * permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ * acknowledgment:
+ * "This product includes software developed by the OpenSSL Project
+ * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com). This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com). */
+
+#include <openssl/x509.h>
+
+#include <assert.h>
+
+#include <openssl/asn1.h>
+#include <openssl/asn1t.h>
+#include <openssl/bio.h>
+#include <openssl/evp.h>
+#include <openssl/err.h>
+#include <openssl/obj.h>
+
+#include "internal.h"
+
+
+ASN1_SEQUENCE(RSA_PSS_PARAMS) = {
+ ASN1_EXP_OPT(RSA_PSS_PARAMS, hashAlgorithm, X509_ALGOR,0),
+ ASN1_EXP_OPT(RSA_PSS_PARAMS, maskGenAlgorithm, X509_ALGOR,1),
+ ASN1_EXP_OPT(RSA_PSS_PARAMS, saltLength, ASN1_INTEGER,2),
+ ASN1_EXP_OPT(RSA_PSS_PARAMS, trailerField, ASN1_INTEGER,3),
+} ASN1_SEQUENCE_END(RSA_PSS_PARAMS)
+
+IMPLEMENT_ASN1_FUNCTIONS(RSA_PSS_PARAMS)
+
+
+/* Given an MGF1 Algorithm ID decode to an Algorithm Identifier */
+static X509_ALGOR *rsa_mgf1_decode(X509_ALGOR *alg) {
+ if (alg == NULL || alg->parameter == NULL ||
+ OBJ_obj2nid(alg->algorithm) != NID_mgf1 ||
+ alg->parameter->type != V_ASN1_SEQUENCE) {
+ return NULL;
+ }
+
+ const uint8_t *p = alg->parameter->value.sequence->data;
+ int plen = alg->parameter->value.sequence->length;
+ return d2i_X509_ALGOR(NULL, &p, plen);
+}
+
+static RSA_PSS_PARAMS *rsa_pss_decode(const X509_ALGOR *alg,
+ X509_ALGOR **pmaskHash) {
+ *pmaskHash = NULL;
+
+ if (alg->parameter == NULL || alg->parameter->type != V_ASN1_SEQUENCE) {
+ return NULL;
+ }
+
+ const uint8_t *p = alg->parameter->value.sequence->data;
+ int plen = alg->parameter->value.sequence->length;
+ RSA_PSS_PARAMS *pss = d2i_RSA_PSS_PARAMS(NULL, &p, plen);
+ if (pss == NULL) {
+ return NULL;
+ }
+
+ *pmaskHash = rsa_mgf1_decode(pss->maskGenAlgorithm);
+ return pss;
+}
+
+/* allocate and set algorithm ID from EVP_MD, default SHA1 */
+static int rsa_md_to_algor(X509_ALGOR **palg, const EVP_MD *md) {
+ if (EVP_MD_type(md) == NID_sha1) {
+ return 1;
+ }
+ *palg = X509_ALGOR_new();
+ if (*palg == NULL) {
+ return 0;
+ }
+ X509_ALGOR_set_md(*palg, md);
+ return 1;
+}
+
+/* Allocate and set MGF1 algorithm ID from EVP_MD */
+static int rsa_md_to_mgf1(X509_ALGOR **palg, const EVP_MD *mgf1md) {
+ X509_ALGOR *algtmp = NULL;
+ ASN1_STRING *stmp = NULL;
+ *palg = NULL;
+
+ if (EVP_MD_type(mgf1md) == NID_sha1) {
+ return 1;
+ }
+ /* need to embed algorithm ID inside another */
+ if (!rsa_md_to_algor(&algtmp, mgf1md) ||
+ !ASN1_item_pack(algtmp, ASN1_ITEM_rptr(X509_ALGOR), &stmp)) {
+ goto err;
+ }
+ *palg = X509_ALGOR_new();
+ if (!*palg) {
+ goto err;
+ }
+ X509_ALGOR_set0(*palg, OBJ_nid2obj(NID_mgf1), V_ASN1_SEQUENCE, stmp);
+ stmp = NULL;
+
+err:
+ ASN1_STRING_free(stmp);
+ X509_ALGOR_free(algtmp);
+ if (*palg) {
+ return 1;
+ }
+
+ return 0;
+}
+
+/* convert algorithm ID to EVP_MD, default SHA1 */
+static const EVP_MD *rsa_algor_to_md(X509_ALGOR *alg) {
+ const EVP_MD *md;
+ if (!alg) {
+ return EVP_sha1();
+ }
+ md = EVP_get_digestbyobj(alg->algorithm);
+ if (md == NULL) {
+ OPENSSL_PUT_ERROR(X509, X509_R_INVALID_PSS_PARAMETERS);
+ }
+ return md;
+}
+
+/* convert MGF1 algorithm ID to EVP_MD, default SHA1 */
+static const EVP_MD *rsa_mgf1_to_md(X509_ALGOR *alg, X509_ALGOR *maskHash) {
+ const EVP_MD *md;
+ if (!alg) {
+ return EVP_sha1();
+ }
+ /* Check mask and lookup mask hash algorithm */
+ if (OBJ_obj2nid(alg->algorithm) != NID_mgf1 ||
+ maskHash == NULL) {
+ OPENSSL_PUT_ERROR(X509, X509_R_INVALID_PSS_PARAMETERS);
+ return NULL;
+ }
+ md = EVP_get_digestbyobj(maskHash->algorithm);
+ if (md == NULL) {
+ OPENSSL_PUT_ERROR(X509, X509_R_INVALID_PSS_PARAMETERS);
+ return NULL;
+ }
+ return md;
+}
+
+int x509_rsa_ctx_to_pss(EVP_MD_CTX *ctx, X509_ALGOR *algor) {
+ const EVP_MD *sigmd, *mgf1md;
+ int saltlen;
+ if (!EVP_PKEY_CTX_get_signature_md(ctx->pctx, &sigmd) ||
+ !EVP_PKEY_CTX_get_rsa_mgf1_md(ctx->pctx, &mgf1md) ||
+ !EVP_PKEY_CTX_get_rsa_pss_saltlen(ctx->pctx, &saltlen)) {
+ return 0;
+ }
+
+ EVP_PKEY *pk = EVP_PKEY_CTX_get0_pkey(ctx->pctx);
+ if (saltlen == -1) {
+ saltlen = EVP_MD_size(sigmd);
+ } else if (saltlen == -2) {
+ saltlen = EVP_PKEY_size(pk) - EVP_MD_size(sigmd) - 2;
+ if (((EVP_PKEY_bits(pk) - 1) & 0x7) == 0) {
+ saltlen--;
+ }
+ } else {
+ return 0;
+ }
+
+ int ret = 0;
+ ASN1_STRING *os = NULL;
+ RSA_PSS_PARAMS *pss = RSA_PSS_PARAMS_new();
+ if (!pss) {
+ goto err;
+ }
+
+ if (saltlen != 20) {
+ pss->saltLength = ASN1_INTEGER_new();
+ if (!pss->saltLength ||
+ !ASN1_INTEGER_set(pss->saltLength, saltlen)) {
+ goto err;
+ }
+ }
+
+ if (!rsa_md_to_algor(&pss->hashAlgorithm, sigmd) ||
+ !rsa_md_to_mgf1(&pss->maskGenAlgorithm, mgf1md)) {
+ goto err;
+ }
+
+ /* Finally create string with pss parameter encoding. */
+ if (!ASN1_item_pack(pss, ASN1_ITEM_rptr(RSA_PSS_PARAMS), &os)) {
+ goto err;
+ }
+
+ X509_ALGOR_set0(algor, OBJ_nid2obj(NID_rsassaPss), V_ASN1_SEQUENCE, os);
+ os = NULL;
+ ret = 1;
+
+err:
+ RSA_PSS_PARAMS_free(pss);
+ ASN1_STRING_free(os);
+ return ret;
+}
+
+int x509_rsa_pss_to_ctx(EVP_MD_CTX *ctx, X509_ALGOR *sigalg, EVP_PKEY *pkey) {
+ assert(OBJ_obj2nid(sigalg->algorithm) == NID_rsassaPss);
+
+ /* Decode PSS parameters */
+ int ret = 0;
+ X509_ALGOR *maskHash;
+ RSA_PSS_PARAMS *pss = rsa_pss_decode(sigalg, &maskHash);
+ if (pss == NULL) {
+ OPENSSL_PUT_ERROR(X509, X509_R_INVALID_PSS_PARAMETERS);
+ goto err;
+ }
+
+ const EVP_MD *mgf1md = rsa_mgf1_to_md(pss->maskGenAlgorithm, maskHash);
+ const EVP_MD *md = rsa_algor_to_md(pss->hashAlgorithm);
+ if (mgf1md == NULL || md == NULL) {
+ goto err;
+ }
+
+ int saltlen = 20;
+ if (pss->saltLength != NULL) {
+ saltlen = ASN1_INTEGER_get(pss->saltLength);
+
+ /* Could perform more salt length sanity checks but the main
+ * RSA routines will trap other invalid values anyway. */
+ if (saltlen < 0) {
+ OPENSSL_PUT_ERROR(X509, X509_R_INVALID_PSS_PARAMETERS);
+ goto err;
+ }
+ }
+
+ /* low-level routines support only trailer field 0xbc (value 1)
+ * and PKCS#1 says we should reject any other value anyway. */
+ if (pss->trailerField != NULL && ASN1_INTEGER_get(pss->trailerField) != 1) {
+ OPENSSL_PUT_ERROR(X509, X509_R_INVALID_PSS_PARAMETERS);
+ goto err;
+ }
+
+ EVP_PKEY_CTX *pctx;
+ if (!EVP_DigestVerifyInit(ctx, &pctx, md, NULL, pkey) ||
+ !EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) ||
+ !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, saltlen) ||
+ !EVP_PKEY_CTX_set_rsa_mgf1_md(pctx, mgf1md)) {
+ goto err;
+ }
+
+ ret = 1;
+
+err:
+ RSA_PSS_PARAMS_free(pss);
+ X509_ALGOR_free(maskHash);
+ return ret;
+}
+
+int x509_print_rsa_pss_params(BIO *bp, const X509_ALGOR *sigalg, int indent,
+ ASN1_PCTX *pctx) {
+ assert(OBJ_obj2nid(sigalg->algorithm) == NID_rsassaPss);
+
+ int rv = 0;
+ X509_ALGOR *maskHash;
+ RSA_PSS_PARAMS *pss = rsa_pss_decode(sigalg, &maskHash);
+ if (!pss) {
+ if (BIO_puts(bp, " (INVALID PSS PARAMETERS)\n") <= 0) {
+ goto err;
+ }
+ rv = 1;
+ goto err;
+ }
+
+ if (BIO_puts(bp, "\n") <= 0 ||
+ !BIO_indent(bp, indent, 128) ||
+ BIO_puts(bp, "Hash Algorithm: ") <= 0) {
+ goto err;
+ }
+
+ if (pss->hashAlgorithm) {
+ if (i2a_ASN1_OBJECT(bp, pss->hashAlgorithm->algorithm) <= 0) {
+ goto err;
+ }
+ } else if (BIO_puts(bp, "sha1 (default)") <= 0) {
+ goto err;
+ }
+
+ if (BIO_puts(bp, "\n") <= 0 ||
+ !BIO_indent(bp, indent, 128) ||
+ BIO_puts(bp, "Mask Algorithm: ") <= 0) {
+ goto err;
+ }
+
+ if (pss->maskGenAlgorithm) {
+ if (i2a_ASN1_OBJECT(bp, pss->maskGenAlgorithm->algorithm) <= 0 ||
+ BIO_puts(bp, " with ") <= 0) {
+ goto err;
+ }
+
+ if (maskHash) {
+ if (i2a_ASN1_OBJECT(bp, maskHash->algorithm) <= 0) {
+ goto err;
+ }
+ } else if (BIO_puts(bp, "INVALID") <= 0) {
+ goto err;
+ }
+ } else if (BIO_puts(bp, "mgf1 with sha1 (default)") <= 0) {
+ goto err;
+ }
+ BIO_puts(bp, "\n");
+
+ if (!BIO_indent(bp, indent, 128) ||
+ BIO_puts(bp, "Salt Length: 0x") <= 0) {
+ goto err;
+ }
+
+ if (pss->saltLength) {
+ if (i2a_ASN1_INTEGER(bp, pss->saltLength) <= 0) {
+ goto err;
+ }
+ } else if (BIO_puts(bp, "14 (default)") <= 0) {
+ goto err;
+ }
+ BIO_puts(bp, "\n");
+
+ if (!BIO_indent(bp, indent, 128) ||
+ BIO_puts(bp, "Trailer Field: 0x") <= 0) {
+ goto err;
+ }
+
+ if (pss->trailerField) {
+ if (i2a_ASN1_INTEGER(bp, pss->trailerField) <= 0) {
+ goto err;
+ }
+ } else if (BIO_puts(bp, "BC (default)") <= 0) {
+ goto err;
+ }
+ BIO_puts(bp, "\n");
+
+ rv = 1;
+
+err:
+ RSA_PSS_PARAMS_free(pss);
+ X509_ALGOR_free(maskHash);
+ return rv;
+}
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