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// Copyright 2014 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 <cryptohi.h>
#include "content/child/webcrypto/crypto_data.h"
#include "content/child/webcrypto/nss/key_nss.h"
#include "content/child/webcrypto/nss/rsa_key_nss.h"
#include "content/child/webcrypto/nss/util_nss.h"
#include "content/child/webcrypto/status.h"
#include "crypto/scoped_nss_types.h"
#include "third_party/WebKit/public/platform/WebCryptoKeyAlgorithm.h"
namespace content {
namespace webcrypto {
namespace {
class RsaSsaImplementation : public RsaHashedAlgorithm {
public:
RsaSsaImplementation()
: RsaHashedAlgorithm(CKF_SIGN | CKF_VERIFY,
blink::WebCryptoKeyUsageVerify,
blink::WebCryptoKeyUsageSign) {}
virtual const char* GetJwkAlgorithm(
const blink::WebCryptoAlgorithmId hash) const OVERRIDE {
switch (hash) {
case blink::WebCryptoAlgorithmIdSha1:
return "RS1";
case blink::WebCryptoAlgorithmIdSha256:
return "RS256";
case blink::WebCryptoAlgorithmIdSha384:
return "RS384";
case blink::WebCryptoAlgorithmIdSha512:
return "RS512";
default:
return NULL;
}
}
virtual Status Sign(const blink::WebCryptoAlgorithm& algorithm,
const blink::WebCryptoKey& key,
const CryptoData& data,
std::vector<uint8>* buffer) const OVERRIDE {
if (key.type() != blink::WebCryptoKeyTypePrivate)
return Status::ErrorUnexpectedKeyType();
SECKEYPrivateKey* private_key = PrivateKeyNss::Cast(key)->key();
const blink::WebCryptoAlgorithm& hash =
key.algorithm().rsaHashedParams()->hash();
// Pick the NSS signing algorithm by combining RSA-SSA (RSA PKCS1) and the
// inner hash of the input Web Crypto algorithm.
SECOidTag sign_alg_tag;
switch (hash.id()) {
case blink::WebCryptoAlgorithmIdSha1:
sign_alg_tag = SEC_OID_PKCS1_SHA1_WITH_RSA_ENCRYPTION;
break;
case blink::WebCryptoAlgorithmIdSha256:
sign_alg_tag = SEC_OID_PKCS1_SHA256_WITH_RSA_ENCRYPTION;
break;
case blink::WebCryptoAlgorithmIdSha384:
sign_alg_tag = SEC_OID_PKCS1_SHA384_WITH_RSA_ENCRYPTION;
break;
case blink::WebCryptoAlgorithmIdSha512:
sign_alg_tag = SEC_OID_PKCS1_SHA512_WITH_RSA_ENCRYPTION;
break;
default:
return Status::ErrorUnsupported();
}
crypto::ScopedSECItem signature_item(SECITEM_AllocItem(NULL, NULL, 0));
if (SEC_SignData(signature_item.get(),
data.bytes(),
data.byte_length(),
private_key,
sign_alg_tag) != SECSuccess) {
return Status::OperationError();
}
buffer->assign(signature_item->data,
signature_item->data + signature_item->len);
return Status::Success();
}
virtual Status Verify(const blink::WebCryptoAlgorithm& algorithm,
const blink::WebCryptoKey& key,
const CryptoData& signature,
const CryptoData& data,
bool* signature_match) const OVERRIDE {
if (key.type() != blink::WebCryptoKeyTypePublic)
return Status::ErrorUnexpectedKeyType();
SECKEYPublicKey* public_key = PublicKeyNss::Cast(key)->key();
const blink::WebCryptoAlgorithm& hash =
key.algorithm().rsaHashedParams()->hash();
const SECItem signature_item = MakeSECItemForBuffer(signature);
SECOidTag hash_alg_tag;
switch (hash.id()) {
case blink::WebCryptoAlgorithmIdSha1:
hash_alg_tag = SEC_OID_SHA1;
break;
case blink::WebCryptoAlgorithmIdSha256:
hash_alg_tag = SEC_OID_SHA256;
break;
case blink::WebCryptoAlgorithmIdSha384:
hash_alg_tag = SEC_OID_SHA384;
break;
case blink::WebCryptoAlgorithmIdSha512:
hash_alg_tag = SEC_OID_SHA512;
break;
default:
return Status::ErrorUnsupported();
}
*signature_match =
SECSuccess == VFY_VerifyDataDirect(data.bytes(),
data.byte_length(),
public_key,
&signature_item,
SEC_OID_PKCS1_RSA_ENCRYPTION,
hash_alg_tag,
NULL,
NULL);
return Status::Success();
}
};
} // namespace
AlgorithmImplementation* CreatePlatformRsaSsaImplementation() {
return new RsaSsaImplementation;
}
} // namespace webcrypto
} // namespace content
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