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