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- /* 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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