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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 <stddef.h>
- #include "base/numerics/safe_math.h"
- #include "components/webcrypto/algorithms/rsa_sign.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_key_algorithm.h"
- #include "third_party/boringssl/src/include/openssl/digest.h"
- #include "third_party/boringssl/src/include/openssl/evp.h"
- #include "third_party/boringssl/src/include/openssl/rsa.h"
- namespace webcrypto {
- namespace {
- // Extracts the OpenSSL key and digest from a WebCrypto key. The returned
- // pointers will remain valid as long as |key| is alive.
- Status GetPKeyAndDigest(const blink::WebCryptoKey& key,
- EVP_PKEY** pkey,
- const EVP_MD** digest) {
- *pkey = GetEVP_PKEY(key);
- *digest = GetDigest(key.Algorithm().RsaHashedParams()->GetHash());
- if (!*digest)
- return Status::ErrorUnsupported();
- return Status::Success();
- }
- // Sets the PSS parameters on |pctx| if the key is for RSA-PSS.
- //
- // Otherwise returns Success without doing anything.
- Status ApplyRsaPssOptions(const blink::WebCryptoKey& key,
- const EVP_MD* const mgf_digest,
- unsigned int salt_length_bytes,
- EVP_PKEY_CTX* pctx) {
- // Only apply RSA-PSS options if the key is for RSA-PSS.
- if (key.Algorithm().Id() != blink::kWebCryptoAlgorithmIdRsaPss) {
- DCHECK_EQ(0u, salt_length_bytes);
- DCHECK_EQ(blink::kWebCryptoAlgorithmIdRsaSsaPkcs1v1_5,
- key.Algorithm().Id());
- return Status::Success();
- }
- // BoringSSL takes a signed int for the salt length, and interprets
- // negative values in a special manner. Make sure not to silently underflow.
- base::CheckedNumeric<int> salt_length_bytes_int(salt_length_bytes);
- if (!salt_length_bytes_int.IsValid()) {
- // TODO(eroman): Give a better error message.
- return Status::OperationError();
- }
- if (1 != EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) ||
- 1 != EVP_PKEY_CTX_set_rsa_mgf1_md(pctx, mgf_digest) ||
- 1 != EVP_PKEY_CTX_set_rsa_pss_saltlen(
- pctx, salt_length_bytes_int.ValueOrDie())) {
- return Status::OperationError();
- }
- return Status::Success();
- }
- } // namespace
- Status RsaSign(const blink::WebCryptoKey& key,
- unsigned int pss_salt_length_bytes,
- base::span<const uint8_t> data,
- std::vector<uint8_t>* buffer) {
- if (key.GetType() != blink::kWebCryptoKeyTypePrivate)
- return Status::ErrorUnexpectedKeyType();
- crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
- bssl::ScopedEVP_MD_CTX ctx;
- EVP_PKEY_CTX* pctx = nullptr; // Owned by |ctx|.
- EVP_PKEY* private_key = nullptr;
- const EVP_MD* digest = nullptr;
- Status status = GetPKeyAndDigest(key, &private_key, &digest);
- if (status.IsError())
- return status;
- // NOTE: A call to EVP_DigestSignFinal() with a NULL second parameter
- // returns a maximum allocation size, while the call without a NULL returns
- // the real one, which may be smaller.
- size_t sig_len = 0;
- if (!EVP_DigestSignInit(ctx.get(), &pctx, digest, nullptr, private_key)) {
- return Status::OperationError();
- }
- // Set PSS-specific options (if applicable).
- status = ApplyRsaPssOptions(key, digest, pss_salt_length_bytes, pctx);
- if (status.IsError())
- return status;
- if (!EVP_DigestSignUpdate(ctx.get(), data.data(), data.size()) ||
- !EVP_DigestSignFinal(ctx.get(), nullptr, &sig_len)) {
- return Status::OperationError();
- }
- buffer->resize(sig_len);
- if (!EVP_DigestSignFinal(ctx.get(), buffer->data(), &sig_len))
- return Status::OperationError();
- buffer->resize(sig_len);
- return Status::Success();
- }
- Status RsaVerify(const blink::WebCryptoKey& key,
- unsigned int pss_salt_length_bytes,
- base::span<const uint8_t> signature,
- base::span<const uint8_t> data,
- bool* signature_match) {
- if (key.GetType() != blink::kWebCryptoKeyTypePublic)
- return Status::ErrorUnexpectedKeyType();
- crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
- bssl::ScopedEVP_MD_CTX ctx;
- EVP_PKEY_CTX* pctx = nullptr; // Owned by |ctx|.
- EVP_PKEY* public_key = nullptr;
- const EVP_MD* digest = nullptr;
- Status status = GetPKeyAndDigest(key, &public_key, &digest);
- if (status.IsError())
- return status;
- if (!EVP_DigestVerifyInit(ctx.get(), &pctx, digest, nullptr, public_key))
- return Status::OperationError();
- // Set PSS-specific options (if applicable).
- status = ApplyRsaPssOptions(key, digest, pss_salt_length_bytes, pctx);
- if (status.IsError())
- return status;
- if (!EVP_DigestVerifyUpdate(ctx.get(), data.data(), data.size()))
- return Status::OperationError();
- *signature_match =
- 1 == EVP_DigestVerifyFinal(ctx.get(), signature.data(), signature.size());
- return Status::Success();
- }
- } // namespace webcrypto
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