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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "crypto/signature_verifier.h"
#include <openssl/bytestring.h>
#include <openssl/digest.h>
#include <openssl/evp.h>
#include <stdint.h>
#include <vector>
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "crypto/openssl_util.h"
#include "crypto/scoped_openssl_types.h"
namespace crypto {
namespace {
const EVP_MD* ToOpenSSLDigest(SignatureVerifier::HashAlgorithm hash_alg) {
switch (hash_alg) {
case SignatureVerifier::SHA1:
return EVP_sha1();
case SignatureVerifier::SHA256:
return EVP_sha256();
}
return NULL;
}
} // namespace
struct SignatureVerifier::VerifyContext {
ScopedEVP_MD_CTX ctx;
};
SignatureVerifier::SignatureVerifier()
: verify_context_(NULL) {
}
SignatureVerifier::~SignatureVerifier() {
Reset();
}
bool SignatureVerifier::VerifyInit(SignatureAlgorithm signature_algorithm,
const uint8_t* signature,
int signature_len,
const uint8_t* public_key_info,
int public_key_info_len) {
int pkey_type = EVP_PKEY_NONE;
const EVP_MD* digest = nullptr;
switch (signature_algorithm) {
case RSA_PKCS1_SHA1:
pkey_type = EVP_PKEY_RSA;
digest = EVP_sha1();
break;
case RSA_PKCS1_SHA256:
pkey_type = EVP_PKEY_RSA;
digest = EVP_sha256();
break;
case ECDSA_SHA256:
pkey_type = EVP_PKEY_EC;
digest = EVP_sha256();
break;
}
DCHECK_NE(EVP_PKEY_NONE, pkey_type);
DCHECK(digest);
return CommonInit(pkey_type, digest, signature, signature_len,
public_key_info, public_key_info_len, nullptr);
}
bool SignatureVerifier::VerifyInitRSAPSS(HashAlgorithm hash_alg,
HashAlgorithm mask_hash_alg,
int salt_len,
const uint8_t* signature,
int signature_len,
const uint8_t* public_key_info,
int public_key_info_len) {
OpenSSLErrStackTracer err_tracer(FROM_HERE);
const EVP_MD* const digest = ToOpenSSLDigest(hash_alg);
DCHECK(digest);
if (!digest) {
return false;
}
EVP_PKEY_CTX* pkey_ctx;
if (!CommonInit(EVP_PKEY_RSA, digest, signature, signature_len,
public_key_info, public_key_info_len, &pkey_ctx)) {
return false;
}
int rv = EVP_PKEY_CTX_set_rsa_padding(pkey_ctx, RSA_PKCS1_PSS_PADDING);
if (rv != 1)
return false;
const EVP_MD* const mgf_digest = ToOpenSSLDigest(mask_hash_alg);
DCHECK(mgf_digest);
if (!mgf_digest) {
return false;
}
return EVP_PKEY_CTX_set_rsa_mgf1_md(pkey_ctx, mgf_digest) &&
EVP_PKEY_CTX_set_rsa_pss_saltlen(pkey_ctx, salt_len);
}
void SignatureVerifier::VerifyUpdate(const uint8_t* data_part,
int data_part_len) {
DCHECK(verify_context_);
OpenSSLErrStackTracer err_tracer(FROM_HERE);
int rv = EVP_DigestVerifyUpdate(verify_context_->ctx.get(),
data_part, data_part_len);
DCHECK_EQ(rv, 1);
}
bool SignatureVerifier::VerifyFinal() {
DCHECK(verify_context_);
OpenSSLErrStackTracer err_tracer(FROM_HERE);
int rv = EVP_DigestVerifyFinal(verify_context_->ctx.get(), signature_.data(),
signature_.size());
DCHECK_EQ(static_cast<int>(!!rv), rv);
Reset();
return rv == 1;
}
bool SignatureVerifier::CommonInit(int pkey_type,
const EVP_MD* digest,
const uint8_t* signature,
int signature_len,
const uint8_t* public_key_info,
int public_key_info_len,
EVP_PKEY_CTX** pkey_ctx) {
if (verify_context_)
return false;
verify_context_ = new VerifyContext;
signature_.assign(signature, signature + signature_len);
CBS cbs;
CBS_init(&cbs, public_key_info, public_key_info_len);
ScopedEVP_PKEY public_key(EVP_parse_public_key(&cbs));
if (!public_key || CBS_len(&cbs) != 0 ||
EVP_PKEY_id(public_key.get()) != pkey_type) {
return false;
}
verify_context_->ctx.reset(EVP_MD_CTX_create());
int rv = EVP_DigestVerifyInit(verify_context_->ctx.get(), pkey_ctx,
digest, nullptr, public_key.get());
return rv == 1;
}
void SignatureVerifier::Reset() {
delete verify_context_;
verify_context_ = NULL;
signature_.clear();
}
} // namespace crypto
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