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crypto/signature_verifier_openssl.cc

 // 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 EVP_md_null();
+  return NULL;
 }
 
 }  // namespace
 
 struct SignatureVerifier::VerifyContext {
   ScopedEVP_MD_CTX ctx;
 };
 
 SignatureVerifier::SignatureVerifier()
     : verify_context_(NULL) {
@@ skipping 33 matching lines @@
 }
 
 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* digest = ToOpenSSLDigest(hash_alg);
+  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;
-  rv = EVP_PKEY_CTX_set_rsa_mgf1_md(pkey_ctx,
-                                    ToOpenSSLDigest(mask_hash_alg));
+  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);
@@ skipping 43 matching lines @@
   return rv == 1;
 }
 
 void SignatureVerifier::Reset() {
   delete verify_context_;
   verify_context_ = NULL;
   signature_.clear();
 }
 
 }  // namespace crypto