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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/390223051): Remove C-library calls to fix the errors.
#pragma allow_unsafe_libc_calls
#endif
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include <memory>
#include "base/containers/span.h"
#include "components/webcrypto/algorithms/rsa.h"
#include "components/webcrypto/algorithms/util.h"
#include "components/webcrypto/blink_key_handle.h"
#include "components/webcrypto/status.h"
#include "crypto/openssl_util.h"
#include "third_party/blink/public/platform/web_crypto_algorithm_params.h"
#include "third_party/blink/public/platform/web_crypto_key_algorithm.h"
#include "third_party/boringssl/src/include/openssl/evp.h"
#include "third_party/boringssl/src/include/openssl/mem.h"
#include "third_party/boringssl/src/include/openssl/rsa.h"
namespace webcrypto {
namespace {
typedef int (*InitFunc)(EVP_PKEY_CTX* ctx);
typedef int (*EncryptDecryptFunc)(EVP_PKEY_CTX* ctx,
unsigned char* out,
size_t* outlen,
const unsigned char* in,
size_t inlen);
// Helper for doing either RSA-OAEP encryption or decryption.
//
// To encrypt call with:
// init_func=EVP_PKEY_encrypt_init, encrypt_decrypt_func=EVP_PKEY_encrypt
//
// To decrypt call with:
// init_func=EVP_PKEY_decrypt_init, encrypt_decrypt_func=EVP_PKEY_decrypt
Status CommonEncryptDecrypt(InitFunc init_func,
EncryptDecryptFunc encrypt_decrypt_func,
const blink::WebCryptoAlgorithm& algorithm,
const blink::WebCryptoKey& key,
base::span<const uint8_t> data,
std::vector<uint8_t>* buffer) {
crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
EVP_PKEY* pkey = GetEVP_PKEY(key);
const EVP_MD* digest =
GetDigest(key.Algorithm().RsaHashedParams()->GetHash());
if (!digest)
return Status::ErrorUnsupported();
bssl::UniquePtr<EVP_PKEY_CTX> ctx(EVP_PKEY_CTX_new(pkey, nullptr));
if (!init_func(ctx.get()) ||
!EVP_PKEY_CTX_set_rsa_padding(ctx.get(), RSA_PKCS1_OAEP_PADDING) ||
!EVP_PKEY_CTX_set_rsa_oaep_md(ctx.get(), digest) ||
!EVP_PKEY_CTX_set_rsa_mgf1_md(ctx.get(), digest)) {
return Status::OperationError();
}
const std::vector<uint8_t>& label =
algorithm.RsaOaepParams()->OptionalLabel();
if (label.size()) {
// Make a copy of the label, since the ctx takes ownership of it when
// calling set0_rsa_oaep_label().
bssl::UniquePtr<uint8_t> label_copy;
label_copy.reset(static_cast<uint8_t*>(OPENSSL_malloc(label.size())));
memcpy(label_copy.get(), label.data(), label.size());
if (1 != EVP_PKEY_CTX_set0_rsa_oaep_label(ctx.get(), label_copy.release(),
label.size())) {
return Status::OperationError();
}
}
// Determine the maximum length of the output.
size_t outlen = 0;
if (!encrypt_decrypt_func(ctx.get(), nullptr, &outlen, data.data(),
data.size())) {
return Status::OperationError();
}
buffer->resize(outlen);
// Do the actual encryption/decryption.
if (!encrypt_decrypt_func(ctx.get(), buffer->data(), &outlen, data.data(),
data.size())) {
return Status::OperationError();
}
buffer->resize(outlen);
return Status::Success();
}
class RsaOaepImplementation : public RsaHashedAlgorithm {
public:
RsaOaepImplementation()
: RsaHashedAlgorithm(
blink::kWebCryptoKeyUsageEncrypt | blink::kWebCryptoKeyUsageWrapKey,
blink::kWebCryptoKeyUsageDecrypt |
blink::kWebCryptoKeyUsageUnwrapKey) {}
const char* GetJwkAlgorithm(
const blink::WebCryptoAlgorithmId hash) const override {
switch (hash) {
case blink::kWebCryptoAlgorithmIdSha1:
return "RSA-OAEP";
case blink::kWebCryptoAlgorithmIdSha256:
return "RSA-OAEP-256";
case blink::kWebCryptoAlgorithmIdSha384:
return "RSA-OAEP-384";
case blink::kWebCryptoAlgorithmIdSha512:
return "RSA-OAEP-512";
default:
return nullptr;
}
}
Status Encrypt(const blink::WebCryptoAlgorithm& algorithm,
const blink::WebCryptoKey& key,
base::span<const uint8_t> data,
std::vector<uint8_t>* buffer) const override {
if (key.GetType() != blink::kWebCryptoKeyTypePublic)
return Status::ErrorUnexpectedKeyType();
return CommonEncryptDecrypt(EVP_PKEY_encrypt_init, EVP_PKEY_encrypt,
algorithm, key, data, buffer);
}
Status Decrypt(const blink::WebCryptoAlgorithm& algorithm,
const blink::WebCryptoKey& key,
base::span<const uint8_t> data,
std::vector<uint8_t>* buffer) const override {
if (key.GetType() != blink::kWebCryptoKeyTypePrivate)
return Status::ErrorUnexpectedKeyType();
return CommonEncryptDecrypt(EVP_PKEY_decrypt_init, EVP_PKEY_decrypt,
algorithm, key, data, buffer);
}
};
} // namespace
std::unique_ptr<AlgorithmImplementation> CreateRsaOaepImplementation() {
return std::make_unique<RsaOaepImplementation>();
}
} // namespace webcrypto
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