[webcrypto] Refactor RSA-SSA signing.

content/child/webcrypto/openssl/rsa_ssa_openssl.cc

 // 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 "content/child/webcrypto/crypto_data.h"
-#include "content/child/webcrypto/openssl/key_openssl.h"
 #include "content/child/webcrypto/openssl/rsa_key_openssl.h"
-#include "content/child/webcrypto/openssl/util_openssl.h"
+#include "content/child/webcrypto/openssl/rsa_sign_openssl.h"
 #include "content/child/webcrypto/status.h"
-#include "crypto/openssl_util.h"
-#include "crypto/scoped_openssl_types.h"
-#include "third_party/WebKit/public/platform/WebCryptoKeyAlgorithm.h"
 
 namespace content {
 
 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 = AsymKeyOpenSsl::Cast(key)->key();
-
-  *digest = GetDigest(key.algorithm().rsaHashedParams()->hash().id());
-  if (!*digest)
-    return Status::ErrorUnsupported();
-
-  return Status::Success();
-}
-
 class RsaSsaImplementation : public RsaHashedAlgorithm {
  public:
   RsaSsaImplementation()
       : RsaHashedAlgorithm(blink::WebCryptoKeyUsageVerify,
                            blink::WebCryptoKeyUsageSign) {}
 
   virtual const char* GetJwkAlgorithm(
       const blink::WebCryptoAlgorithmId hash) const override {
     switch (hash) {
       case blink::WebCryptoAlgorithmIdSha1:
         return "RS1";
       case blink::WebCryptoAlgorithmIdSha256:
         return "RS256";
       case blink::WebCryptoAlgorithmIdSha384:
         return "RS384";
       case blink::WebCryptoAlgorithmIdSha512:
         return "RS512";
       default:
         return NULL;
     }
   }
 
   virtual Status Sign(const blink::WebCryptoAlgorithm& algorithm,
                       const blink::WebCryptoKey& key,
                       const CryptoData& data,
                       std::vector<uint8_t>* buffer) const override {
-    if (key.type() != blink::WebCryptoKeyTypePrivate)
-      return Status::ErrorUnexpectedKeyType();
-
-    crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
-    crypto::ScopedEVP_MD_CTX ctx(EVP_MD_CTX_create());
-
-    EVP_PKEY* private_key = NULL;
-    const EVP_MD* digest = NULL;
-    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 (!ctx.get() ||
-        !EVP_DigestSignInit(ctx.get(), NULL, digest, NULL, private_key) ||
-        !EVP_DigestSignUpdate(ctx.get(), data.bytes(), data.byte_length()) ||
-        !EVP_DigestSignFinal(ctx.get(), NULL, &sig_len)) {
-      return Status::OperationError();
-    }
-
-    buffer->resize(sig_len);
-    if (!EVP_DigestSignFinal(ctx.get(), &buffer->front(), &sig_len))
-      return Status::OperationError();
-
-    buffer->resize(sig_len);
-    return Status::Success();
+    return RsaSign(key, data, buffer);
   }
 
   virtual Status Verify(const blink::WebCryptoAlgorithm& algorithm,
                         const blink::WebCryptoKey& key,
                         const CryptoData& signature,
                         const CryptoData& data,
                         bool* signature_match) const override {
-    if (key.type() != blink::WebCryptoKeyTypePublic)
-      return Status::ErrorUnexpectedKeyType();
-
-    crypto::OpenSSLErrStackTracer err_tracer(FROM_HERE);
-    crypto::ScopedEVP_MD_CTX ctx(EVP_MD_CTX_create());
-
-    EVP_PKEY* public_key = NULL;
-    const EVP_MD* digest = NULL;
-    Status status = GetPKeyAndDigest(key, &public_key, &digest);
-    if (status.IsError())
-      return status;
-
-    if (!EVP_DigestVerifyInit(ctx.get(), NULL, digest, NULL, public_key))
-      return Status::OperationError();
-
-    if (!EVP_DigestVerifyUpdate(ctx.get(), data.bytes(), data.byte_length())) {
-      return Status::OperationError();
-    }
-
-    // Note that the return value can be:
-    //   1 --> Success
-    //   0 --> Verification failed
-    //  <0 --> Operation error
-    int rv = EVP_DigestVerifyFinal(
-        ctx.get(), signature.bytes(), signature.byte_length());
-    *signature_match = rv == 1;
-    return rv >= 0 ? Status::Success() : Status::OperationError();
+    return RsaVerify(key, signature, data, signature_match);
   }
 };
 
 }  // namespace
 
 AlgorithmImplementation* CreatePlatformRsaSsaImplementation() {
   return new RsaSsaImplementation;
 }
 
 }  // namespace webcrypto
 
 }  // namespace content