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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 <stdlib.h>
#include "base/logging.h"
#include "crypto/cssm_init.h"
namespace crypto {
SignatureVerifier::SignatureVerifier() : sig_handle_(0) {
EnsureCSSMInit();
}
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) {
signature_.assign(signature, signature + signature_len);
public_key_info_.assign(public_key_info,
public_key_info + public_key_info_len);
CSSM_ALGORITHMS key_alg = CSSM_ALGID_RSA; // TODO(wtc): hardcoded.
memset(&public_key_, 0, sizeof(public_key_));
public_key_.KeyData.Data = const_cast<uint8*>(&public_key_info_[0]);
public_key_.KeyData.Length = public_key_info_.size();
public_key_.KeyHeader.HeaderVersion = CSSM_KEYHEADER_VERSION;
public_key_.KeyHeader.BlobType = CSSM_KEYBLOB_RAW;
public_key_.KeyHeader.Format = CSSM_KEYBLOB_RAW_FORMAT_X509;
public_key_.KeyHeader.AlgorithmId = key_alg;
public_key_.KeyHeader.KeyClass = CSSM_KEYCLASS_PUBLIC_KEY;
public_key_.KeyHeader.KeyAttr = CSSM_KEYATTR_EXTRACTABLE;
public_key_.KeyHeader.KeyUsage = CSSM_KEYUSE_VERIFY;
CSSM_KEY_SIZE key_size;
CSSM_RETURN crtn;
crtn = CSSM_QueryKeySizeInBits(GetSharedCSPHandle(), NULL,
&public_key_, &key_size);
if (crtn) {
NOTREACHED() << "CSSM_QueryKeySizeInBits failed: " << crtn;
return false;
}
public_key_.KeyHeader.LogicalKeySizeInBits = key_size.LogicalKeySizeInBits;
// TODO(wtc): decode signature_algorithm...
CSSM_ALGORITHMS sig_alg = CSSM_ALGID_SHA1WithRSA;
crtn = CSSM_CSP_CreateSignatureContext(GetSharedCSPHandle(), sig_alg, NULL,
&public_key_, &sig_handle_);
if (crtn) {
NOTREACHED();
return false;
}
crtn = CSSM_VerifyDataInit(sig_handle_);
if (crtn) {
NOTREACHED();
return false;
}
return true;
}
void SignatureVerifier::VerifyUpdate(const uint8* data_part,
int data_part_len) {
CSSM_DATA data;
data.Data = const_cast<uint8*>(data_part);
data.Length = data_part_len;
CSSM_RETURN crtn = CSSM_VerifyDataUpdate(sig_handle_, &data, 1);
DCHECK(crtn == CSSM_OK);
}
bool SignatureVerifier::VerifyFinal() {
CSSM_DATA sig;
sig.Data = const_cast<uint8*>(&signature_[0]);
sig.Length = signature_.size();
CSSM_RETURN crtn = CSSM_VerifyDataFinal(sig_handle_, &sig);
Reset();
// crtn is CSSMERR_CSP_VERIFY_FAILED if signature verification fails.
return (crtn == CSSM_OK);
}
void SignatureVerifier::Reset() {
CSSM_RETURN crtn;
if (sig_handle_) {
crtn = CSSM_DeleteContext(sig_handle_);
DCHECK(crtn == CSSM_OK);
sig_handle_ = 0;
}
signature_.clear();
// Can't call CSSM_FreeKey on public_key_ because we constructed
// public_key_ manually.
}
} // namespace crypto
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