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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* 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 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 acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS 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 AUTHOR OR 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.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.] */
#include <CCryptoBoringSSL_x509.h>
#include <CCryptoBoringSSL_asn1.h>
#include <CCryptoBoringSSL_digest.h>
#include <CCryptoBoringSSL_err.h>
#include <CCryptoBoringSSL_evp.h>
#include <CCryptoBoringSSL_obj.h>
#include "internal.h"
// Restrict the digests that are allowed in X509 certificates
static int x509_digest_nid_ok(const int digest_nid) {
switch (digest_nid) {
case NID_md4:
case NID_md5:
return 0;
}
return 1;
}
int x509_digest_sign_algorithm(EVP_MD_CTX *ctx, X509_ALGOR *algor) {
EVP_PKEY *pkey = EVP_PKEY_CTX_get0_pkey(ctx->pctx);
if (pkey == NULL) {
OPENSSL_PUT_ERROR(ASN1, ASN1_R_CONTEXT_NOT_INITIALISED);
return 0;
}
if (EVP_PKEY_id(pkey) == EVP_PKEY_RSA) {
int pad_mode;
if (!EVP_PKEY_CTX_get_rsa_padding(ctx->pctx, &pad_mode)) {
return 0;
}
// RSA-PSS has special signature algorithm logic.
if (pad_mode == RSA_PKCS1_PSS_PADDING) {
return x509_rsa_ctx_to_pss(ctx, algor);
}
}
if (EVP_PKEY_id(pkey) == EVP_PKEY_ED25519) {
return X509_ALGOR_set0(algor, OBJ_nid2obj(NID_ED25519), V_ASN1_UNDEF, NULL);
}
// Default behavior: look up the OID for the algorithm/hash pair and encode
// that.
const EVP_MD *digest = EVP_MD_CTX_md(ctx);
if (digest == NULL) {
OPENSSL_PUT_ERROR(ASN1, ASN1_R_CONTEXT_NOT_INITIALISED);
return 0;
}
const int digest_nid = EVP_MD_type(digest);
int sign_nid;
if (!x509_digest_nid_ok(digest_nid) ||
!OBJ_find_sigid_by_algs(&sign_nid, digest_nid, EVP_PKEY_id(pkey))) {
OPENSSL_PUT_ERROR(ASN1, ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
return 0;
}
// RSA signature algorithms include an explicit NULL parameter. Others omit
// it.
int paramtype =
(EVP_PKEY_id(pkey) == EVP_PKEY_RSA) ? V_ASN1_NULL : V_ASN1_UNDEF;
X509_ALGOR_set0(algor, OBJ_nid2obj(sign_nid), paramtype, NULL);
return 1;
}
int x509_digest_verify_init(EVP_MD_CTX *ctx, const X509_ALGOR *sigalg,
EVP_PKEY *pkey) {
// Convert the signature OID into digest and public key OIDs.
int sigalg_nid = OBJ_obj2nid(sigalg->algorithm);
int digest_nid, pkey_nid;
if (!OBJ_find_sigid_algs(sigalg_nid, &digest_nid, &pkey_nid)) {
OPENSSL_PUT_ERROR(ASN1, ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
return 0;
}
// Check the public key OID matches the public key type.
if (pkey_nid != EVP_PKEY_id(pkey)) {
OPENSSL_PUT_ERROR(ASN1, ASN1_R_WRONG_PUBLIC_KEY_TYPE);
return 0;
}
// Check for permitted digest algorithms
if (!x509_digest_nid_ok(digest_nid)) {
OPENSSL_PUT_ERROR(ASN1, ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
return 0;
}
// NID_undef signals that there are custom parameters to set.
if (digest_nid == NID_undef) {
if (sigalg_nid == NID_rsassaPss) {
return x509_rsa_pss_to_ctx(ctx, sigalg, pkey);
}
if (sigalg_nid == NID_ED25519) {
if (sigalg->parameter != NULL) {
OPENSSL_PUT_ERROR(X509, X509_R_INVALID_PARAMETER);
return 0;
}
return EVP_DigestVerifyInit(ctx, NULL, NULL, NULL, pkey);
}
OPENSSL_PUT_ERROR(ASN1, ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
return 0;
}
// The parameter should be an explicit NULL for RSA and omitted for ECDSA. For
// compatibility, we allow either for both algorithms. See b/167375496.
//
// TODO(davidben): Chromium's verifier allows both forms for RSA, but enforces
// ECDSA more strictly. Align with Chromium and add a flag for b/167375496.
if (sigalg->parameter != NULL && sigalg->parameter->type != V_ASN1_NULL) {
OPENSSL_PUT_ERROR(X509, X509_R_INVALID_PARAMETER);
return 0;
}
// Otherwise, initialize with the digest from the OID.
const EVP_MD *digest = EVP_get_digestbynid(digest_nid);
if (digest == NULL) {
OPENSSL_PUT_ERROR(ASN1, ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
return 0;
}
return EVP_DigestVerifyInit(ctx, NULL, digest, NULL, pkey);
}
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