1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include "crypto/signature_verifier.h"
7 #include "base/logging.h"
8 #include "crypto/openssl_util.h"
9 #include "third_party/boringssl/src/include/openssl/bytestring.h"
10 #include "third_party/boringssl/src/include/openssl/digest.h"
11 #include "third_party/boringssl/src/include/openssl/evp.h"
12 #include "third_party/boringssl/src/include/openssl/rsa.h"
16 struct SignatureVerifier::VerifyContext {
17 bssl::ScopedEVP_MD_CTX ctx;
20 SignatureVerifier::SignatureVerifier() = default;
22 SignatureVerifier::~SignatureVerifier() = default;
24 bool SignatureVerifier::VerifyInit(SignatureAlgorithm signature_algorithm,
25 base::span<const uint8_t> signature,
26 base::span<const uint8_t> public_key_info) {
27 OpenSSLErrStackTracer err_tracer(FROM_HERE);
29 int pkey_type = EVP_PKEY_NONE;
30 const EVP_MD* digest = nullptr;
31 switch (signature_algorithm) {
33 pkey_type = EVP_PKEY_RSA;
36 case RSA_PKCS1_SHA256:
38 pkey_type = EVP_PKEY_RSA;
39 digest = EVP_sha256();
42 pkey_type = EVP_PKEY_EC;
43 digest = EVP_sha256();
46 DCHECK_NE(EVP_PKEY_NONE, pkey_type);
52 verify_context_.reset(new VerifyContext);
53 signature_.assign(signature.data(), signature.data() + signature.size());
56 CBS_init(&cbs, public_key_info.data(), public_key_info.size());
57 bssl::UniquePtr<EVP_PKEY> public_key(EVP_parse_public_key(&cbs));
58 if (!public_key || CBS_len(&cbs) != 0 ||
59 EVP_PKEY_id(public_key.get()) != pkey_type) {
63 EVP_PKEY_CTX* pkey_ctx;
64 if (!EVP_DigestVerifyInit(verify_context_->ctx.get(), &pkey_ctx, digest,
65 nullptr, public_key.get())) {
69 if (signature_algorithm == RSA_PSS_SHA256) {
70 if (!EVP_PKEY_CTX_set_rsa_padding(pkey_ctx, RSA_PKCS1_PSS_PADDING) ||
71 !EVP_PKEY_CTX_set_rsa_mgf1_md(pkey_ctx, digest) ||
72 !EVP_PKEY_CTX_set_rsa_pss_saltlen(
73 pkey_ctx, -1 /* match digest and salt length */)) {
81 void SignatureVerifier::VerifyUpdate(base::span<const uint8_t> data_part) {
82 DCHECK(verify_context_);
83 OpenSSLErrStackTracer err_tracer(FROM_HERE);
84 int rv = EVP_DigestVerifyUpdate(verify_context_->ctx.get(), data_part.data(),
89 bool SignatureVerifier::VerifyFinal() {
90 DCHECK(verify_context_);
91 OpenSSLErrStackTracer err_tracer(FROM_HERE);
92 int rv = EVP_DigestVerifyFinal(verify_context_->ctx.get(), signature_.data(),
94 DCHECK_EQ(static_cast<int>(!!rv), rv);
99 void SignatureVerifier::Reset() {
100 verify_context_.reset();
104 } // namespace crypto