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// Copyright (c) 2012 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/rsa_private_key.h"
#include <list>
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "crypto/cssm_init.h"
namespace crypto {
// static
RSAPrivateKey* RSAPrivateKey::Create(uint16 num_bits) {
scoped_ptr<RSAPrivateKey> result(new RSAPrivateKey);
CSSM_CC_HANDLE cc_handle;
CSSM_RETURN crtn;
crtn = CSSM_CSP_CreateKeyGenContext(GetSharedCSPHandle(), CSSM_ALGID_RSA,
num_bits, NULL, NULL, NULL, NULL, NULL,
&cc_handle);
if (crtn) {
NOTREACHED() << "CSSM_CSP_CreateKeyGenContext failed: " << crtn;
return NULL;
}
CSSM_DATA label = { 9,
const_cast<uint8*>(reinterpret_cast<const uint8*>("temp_key")) };
crtn = CSSM_GenerateKeyPair(cc_handle,
CSSM_KEYUSE_VERIFY,
CSSM_KEYATTR_RETURN_DATA | CSSM_KEYATTR_EXTRACTABLE, &label,
result->public_key(), CSSM_KEYUSE_SIGN,
CSSM_KEYATTR_RETURN_DATA | CSSM_KEYATTR_EXTRACTABLE, &label, NULL,
result->key());
CSSM_DeleteContext(cc_handle);
if (crtn) {
NOTREACHED() << "CSSM_CSP_CreateKeyGenContext failed: " << crtn;
return NULL;
}
return result.release();
}
// static
RSAPrivateKey* RSAPrivateKey::CreateSensitive(uint16 num_bits) {
NOTIMPLEMENTED();
return NULL;
}
// static
RSAPrivateKey* RSAPrivateKey::CreateFromPrivateKeyInfo(
const std::vector<uint8>& input) {
if (input.empty())
return NULL;
scoped_ptr<RSAPrivateKey> result(new RSAPrivateKey);
CSSM_KEY key;
memset(&key, 0, sizeof(key));
key.KeyData.Data = const_cast<uint8*>(&input.front());
key.KeyData.Length = input.size();
key.KeyHeader.Format = CSSM_KEYBLOB_RAW_FORMAT_PKCS8;
key.KeyHeader.HeaderVersion = CSSM_KEYHEADER_VERSION;
key.KeyHeader.BlobType = CSSM_KEYBLOB_RAW;
key.KeyHeader.AlgorithmId = CSSM_ALGID_RSA;
key.KeyHeader.KeyClass = CSSM_KEYCLASS_PRIVATE_KEY;
key.KeyHeader.KeyAttr = CSSM_KEYATTR_EXTRACTABLE;
key.KeyHeader.KeyUsage = CSSM_KEYUSE_ANY;
CSSM_KEY_SIZE key_size;
CSSM_RETURN crtn;
crtn = CSSM_QueryKeySizeInBits(
GetSharedCSPHandle(), CSSM_INVALID_HANDLE, &key, &key_size);
if (crtn) {
NOTREACHED() << "CSSM_QueryKeySizeInBits failed: " << crtn;
return NULL;
}
key.KeyHeader.LogicalKeySizeInBits = key_size.LogicalKeySizeInBits;
// Perform a NULL unwrap operation on the key so that result's key_
// instance variable points to a key that can be released via CSSM_FreeKey().
CSSM_ACCESS_CREDENTIALS creds;
memset(&creds, 0, sizeof(CSSM_ACCESS_CREDENTIALS));
CSSM_CC_HANDLE cc_handle;
crtn = CSSM_CSP_CreateSymmetricContext(GetSharedCSPHandle(), CSSM_ALGID_NONE,
CSSM_ALGMODE_NONE, &creds, NULL, NULL, CSSM_PADDING_NONE, 0, &cc_handle);
if (crtn) {
NOTREACHED() << "CSSM_CSP_CreateSymmetricContext failed: " << crtn;
return NULL;
}
CSSM_DATA label_data, desc_data = { 0, NULL };
label_data.Data =
const_cast<uint8*>(reinterpret_cast<const uint8*>("unwrapped"));
label_data.Length = 9;
crtn = CSSM_UnwrapKey(cc_handle, NULL, &key, CSSM_KEYUSE_ANY,
CSSM_KEYATTR_RETURN_DATA | CSSM_KEYATTR_EXTRACTABLE, &label_data,
NULL, result->key(), &desc_data);
if (crtn) {
NOTREACHED() << "CSSM_UnwrapKey failed: " << crtn;
return NULL;
}
// Extract a public key from the private key.
// Apple doesn't accept CSSM_KEYBLOB_RAW_FORMAT_X509 as a valid key
// format when attempting to generate certs, so use PKCS1 instead.
PrivateKeyInfoCodec codec(true);
std::vector<uint8> private_key_data;
private_key_data.assign(key.KeyData.Data,
key.KeyData.Data + key.KeyData.Length);
if (!codec.Import(private_key_data)) {
return NULL;
}
std::vector<uint8> public_key_data;
if (!codec.ExportPublicKey(&public_key_data)) {
return NULL;
}
CSSM_KEY* public_key = result->public_key();
size_t size = public_key_data.size();
public_key->KeyData.Data = reinterpret_cast<uint8*>(CSSMMalloc(size));
if (!public_key->KeyData.Data) {
NOTREACHED() << "CSSMMalloc failed";
return NULL;
}
memcpy(public_key->KeyData.Data, &public_key_data.front(), size);
public_key->KeyData.Length = size;
public_key->KeyHeader.Format = CSSM_KEYBLOB_RAW_FORMAT_PKCS1;
public_key->KeyHeader.HeaderVersion = CSSM_KEYHEADER_VERSION;
public_key->KeyHeader.BlobType = CSSM_KEYBLOB_RAW;
public_key->KeyHeader.AlgorithmId = CSSM_ALGID_RSA;
public_key->KeyHeader.KeyClass = CSSM_KEYCLASS_PUBLIC_KEY;
public_key->KeyHeader.KeyAttr = CSSM_KEYATTR_EXTRACTABLE;
public_key->KeyHeader.KeyUsage = CSSM_KEYUSE_ANY;
crtn = CSSM_QueryKeySizeInBits(
GetSharedCSPHandle(), CSSM_INVALID_HANDLE, public_key, &key_size);
if (crtn) {
DLOG(ERROR) << "CSSM_QueryKeySizeInBits failed " << crtn;
return NULL;
}
public_key->KeyHeader.LogicalKeySizeInBits = key_size.LogicalKeySizeInBits;
return result.release();
}
// static
RSAPrivateKey* RSAPrivateKey::CreateSensitiveFromPrivateKeyInfo(
const std::vector<uint8>& input) {
NOTIMPLEMENTED();
return NULL;
}
// static
RSAPrivateKey* RSAPrivateKey::FindFromPublicKeyInfo(
const std::vector<uint8>& input) {
NOTIMPLEMENTED();
return NULL;
}
RSAPrivateKey::RSAPrivateKey() {
memset(&key_, 0, sizeof(key_));
memset(&public_key_, 0, sizeof(public_key_));
EnsureCSSMInit();
}
RSAPrivateKey::~RSAPrivateKey() {
if (key_.KeyData.Data) {
CSSM_FreeKey(GetSharedCSPHandle(), NULL, &key_, CSSM_FALSE);
}
if (public_key_.KeyData.Data) {
CSSM_FreeKey(GetSharedCSPHandle(), NULL, &public_key_, CSSM_FALSE);
}
}
RSAPrivateKey* RSAPrivateKey::Copy() const {
std::vector<uint8> key_bytes;
if (!ExportPrivateKey(&key_bytes))
return NULL;
return CreateFromPrivateKeyInfo(key_bytes);
}
bool RSAPrivateKey::ExportPrivateKey(std::vector<uint8>* output) const {
if (!key_.KeyData.Data || !key_.KeyData.Length) {
return false;
}
output->clear();
output->insert(output->end(), key_.KeyData.Data,
key_.KeyData.Data + key_.KeyData.Length);
return true;
}
bool RSAPrivateKey::ExportPublicKey(std::vector<uint8>* output) const {
PrivateKeyInfoCodec private_key_info(true);
std::vector<uint8> private_key_data;
private_key_data.assign(key_.KeyData.Data,
key_.KeyData.Data + key_.KeyData.Length);
return (private_key_info.Import(private_key_data) &&
private_key_info.ExportPublicKeyInfo(output));
}
} // namespace crypto
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