1 files changed, 160 insertions, 0 deletions
diff --git a/crypto/signature_verifier_openssl.cc b/crypto/signature_verifier_openssl.cc
new file mode 100644
index 0000000000..a33d665ec1
--- /dev/null
+++ b/crypto/signature_verifier_openssl.cc
@@ -0,0 +1,160 @@
+// Copyright (c) 2011 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/signature_verifier.h"
+
+#include <openssl/evp.h>
+#include <openssl/x509.h>
+
+#include <vector>
+
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/stl_util.h"
+#include "crypto/openssl_util.h"
+#include "crypto/scoped_openssl_types.h"
+
+namespace crypto {
+
+namespace {
+
+const EVP_MD* ToOpenSSLDigest(SignatureVerifier::HashAlgorithm hash_alg) {
+  switch (hash_alg) {
+    case SignatureVerifier::SHA1:
+      return EVP_sha1();
+    case SignatureVerifier::SHA256:
+      return EVP_sha256();
+  }
+  return NULL;
+}
+
+}  // namespace
+
+struct SignatureVerifier::VerifyContext {
+  ScopedEVP_MD_CTX ctx;
+};
+
+SignatureVerifier::SignatureVerifier()
+    : verify_context_(NULL) {
+}
+
+SignatureVerifier::~SignatureVerifier() {
+  Reset();
+}
+
+bool SignatureVerifier::VerifyInit(const uint8* signature_algorithm,
+                                   int signature_algorithm_len,
+                                   const uint8* signature,
+                                   int signature_len,
+                                   const uint8* public_key_info,
+                                   int public_key_info_len) {
+  OpenSSLErrStackTracer err_tracer(FROM_HERE);
+  ScopedOpenSSL<X509_ALGOR, X509_ALGOR_free> algorithm(
+      d2i_X509_ALGOR(NULL, &signature_algorithm, signature_algorithm_len));
+  if (!algorithm.get())
+    return false;
+  int nid = OBJ_obj2nid(algorithm.get()->algorithm);
+  const EVP_MD* digest;
+  if (nid == NID_ecdsa_with_SHA1) {
+    digest = EVP_sha1();
+  } else if (nid == NID_ecdsa_with_SHA256) {
+    digest = EVP_sha256();
+  } else {
+    // This works for PKCS #1 v1.5 RSA signatures, but not for ECDSA
+    // signatures.
+    digest = EVP_get_digestbyobj(algorithm.get()->algorithm);
+  }
+  if (!digest)
+    return false;
+
+  return CommonInit(digest, signature, signature_len, public_key_info,
+                    public_key_info_len, NULL);
+}
+
+bool SignatureVerifier::VerifyInitRSAPSS(HashAlgorithm hash_alg,
+                                         HashAlgorithm mask_hash_alg,
+                                         int salt_len,
+                                         const uint8* signature,
+                                         int signature_len,
+                                         const uint8* public_key_info,
+                                         int public_key_info_len) {
+  OpenSSLErrStackTracer err_tracer(FROM_HERE);
+  const EVP_MD* const digest = ToOpenSSLDigest(hash_alg);
+  DCHECK(digest);
+  if (!digest) {
+    return false;
+  }
+
+  EVP_PKEY_CTX* pkey_ctx;
+  if (!CommonInit(digest, signature, signature_len, public_key_info,
+                  public_key_info_len, &pkey_ctx)) {
+    return false;
+  }
+
+  int rv = EVP_PKEY_CTX_set_rsa_padding(pkey_ctx, RSA_PKCS1_PSS_PADDING);
+  if (rv != 1)
+    return false;
+  const EVP_MD* const mgf_digest = ToOpenSSLDigest(mask_hash_alg);
+  DCHECK(mgf_digest);
+  if (!mgf_digest) {
+    return false;
+  }
+  rv = EVP_PKEY_CTX_set_rsa_mgf1_md(pkey_ctx, mgf_digest);
+  if (rv != 1)
+    return false;
+  rv = EVP_PKEY_CTX_set_rsa_pss_saltlen(pkey_ctx, salt_len);
+  return rv == 1;
+}
+
+void SignatureVerifier::VerifyUpdate(const uint8* data_part,
+                                     int data_part_len) {
+  DCHECK(verify_context_);
+  OpenSSLErrStackTracer err_tracer(FROM_HERE);
+  int rv = EVP_DigestVerifyUpdate(verify_context_->ctx.get(),
+                                  data_part, data_part_len);
+  DCHECK_EQ(rv, 1);
+}
+
+bool SignatureVerifier::VerifyFinal() {
+  DCHECK(verify_context_);
+  OpenSSLErrStackTracer err_tracer(FROM_HERE);
+  int rv = EVP_DigestVerifyFinal(verify_context_->ctx.get(),
+                                 vector_as_array(&signature_),
+                                 signature_.size());
+  DCHECK_EQ(static_cast<int>(!!rv), rv);
+  Reset();
+  return rv == 1;
+}
+
+bool SignatureVerifier::CommonInit(const EVP_MD* digest,
+                                   const uint8* signature,
+                                   int signature_len,
+                                   const uint8* public_key_info,
+                                   int public_key_info_len,
+                                   EVP_PKEY_CTX** pkey_ctx) {
+  if (verify_context_)
+    return false;
+
+  verify_context_ = new VerifyContext;
+
+  signature_.assign(signature, signature + signature_len);
+
+  const uint8_t* ptr = public_key_info;
+  ScopedEVP_PKEY public_key(d2i_PUBKEY(nullptr, &ptr, public_key_info_len));
+  if (!public_key.get() || ptr != public_key_info + public_key_info_len)
+    return false;
+
+  verify_context_->ctx.reset(EVP_MD_CTX_create());
+  int rv = EVP_DigestVerifyInit(verify_context_->ctx.get(), pkey_ctx,
+                                digest, nullptr, public_key.get());
+  return rv == 1;
+}
+
+void SignatureVerifier::Reset() {
+  delete verify_context_;
+  verify_context_ = NULL;
+  signature_.clear();
+}
+
+}  // namespace crypto