| // 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 "base/crypto/signature_verifier.h" |
| |
| #include <openssl/evp.h> |
| #include <openssl/x509.h> |
| |
| #include <vector> |
| |
| #include "base/logging.h" |
| #include "base/memory/scoped_ptr.h" |
| #include "base/openssl_util.h" |
| #include "base/stl_util-inl.h" |
| |
| namespace base { |
| |
| struct SignatureVerifier::VerifyContext { |
| ScopedOpenSSL<EVP_PKEY, EVP_PKEY_free> public_key; |
| ScopedOpenSSL<EVP_MD_CTX, EVP_MD_CTX_destroy> ctx; |
| }; |
| |
| SignatureVerifier::SignatureVerifier() |
| : verify_context_(NULL) { |
| } |
| |
| SignatureVerifier::~SignatureVerifier() { |
| Reset(); |
| } |
| |
| bool SignatureVerifier::VerifyInit(const uint8* signature_algorithm, |
| int signature_algorithm_len, |
| const uint8* signature, |
| int signature_len, |
| const uint8* public_key_info, |
| int public_key_info_len) { |
| DCHECK(!verify_context_); |
| verify_context_ = new VerifyContext; |
| OpenSSLErrStackTracer err_tracer(FROM_HERE); |
| |
| ScopedOpenSSL<X509_ALGOR, X509_ALGOR_free> algorithm( |
| d2i_X509_ALGOR(NULL, &signature_algorithm, signature_algorithm_len)); |
| if (!algorithm.get()) |
| return false; |
| |
| const EVP_MD* digest = EVP_get_digestbyobj(algorithm.get()->algorithm); |
| DCHECK(digest); |
| |
| signature_.assign(signature, signature + signature_len); |
| |
| // BIO_new_mem_buf is not const aware, but it does not modify the buffer. |
| char* data = reinterpret_cast<char*>(const_cast<uint8*>(public_key_info)); |
| ScopedOpenSSL<BIO, BIO_free_all> bio(BIO_new_mem_buf(data, |
| public_key_info_len)); |
| if (!bio.get()) |
| return false; |
| |
| verify_context_->public_key.reset(d2i_PUBKEY_bio(bio.get(), NULL)); |
| if (!verify_context_->public_key.get()) |
| return false; |
| |
| verify_context_->ctx.reset(EVP_MD_CTX_create()); |
| int rv = EVP_VerifyInit_ex(verify_context_->ctx.get(), digest, NULL); |
| return rv == 1; |
| } |
| |
| void SignatureVerifier::VerifyUpdate(const uint8* data_part, |
| int data_part_len) { |
| DCHECK(verify_context_); |
| OpenSSLErrStackTracer err_tracer(FROM_HERE); |
| int rv = EVP_VerifyUpdate(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_VerifyFinal(verify_context_->ctx.get(), |
| vector_as_array(&signature_), signature_.size(), |
| verify_context_->public_key.get()); |
| DCHECK_GE(rv, 0); |
| Reset(); |
| return rv == 1; |
| } |
| |
| void SignatureVerifier::Reset() { |
| delete verify_context_; |
| verify_context_ = NULL; |
| signature_.clear(); |
| } |
| |
| } // namespace base |