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content/child/webcrypto/openssl/aes_gcm_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 <vector>
 #include <openssl/evp.h>
 
 #include "base/logging.h"
 #include "content/child/webcrypto/crypto_data.h"
 #include "content/child/webcrypto/openssl/aes_key_openssl.h"
@@ skipping 53 matching lines @@
                          Uint8VectorStart(raw_key),
                          raw_key.size(),
                          tag_length_bytes,
                          NULL)) {
     return Status::OperationError();
   }
 
   crypto::ScopedOpenSSL<EVP_AEAD_CTX, EVP_AEAD_CTX_cleanup>::Type ctx_cleanup(
       &ctx);
 
-  ssize_t len;
+  size_t len;
+  int ok;
 
   if (mode == DECRYPT) {
     if (data.byte_length() < tag_length_bytes)
       return Status::ErrorDataTooSmall();
 
     buffer->resize(data.byte_length() - tag_length_bytes);
 
-    len = EVP_AEAD_CTX_open(&ctx,
-                            Uint8VectorStart(buffer),
-                            buffer->size(),
-                            iv.bytes(),
-                            iv.byte_length(),
-                            data.bytes(),
-                            data.byte_length(),
-                            additional_data.bytes(),
-                            additional_data.byte_length());
+    ok = EVP_AEAD_CTX_open(&ctx,
+                           Uint8VectorStart(buffer),
+                           &len,
+                           buffer->size(),
+                           iv.bytes(),
+                           iv.byte_length(),
+                           data.bytes(),
+                           data.byte_length(),
+                           additional_data.bytes(),
+                           additional_data.byte_length());
   } else {
     // No need to check for unsigned integer overflow here (seal fails if
     // the output buffer is too small).
     buffer->resize(data.byte_length() + tag_length_bytes);
 
-    len = EVP_AEAD_CTX_seal(&ctx,
-                            Uint8VectorStart(buffer),
-                            buffer->size(),
-                            iv.bytes(),
-                            iv.byte_length(),
-                            data.bytes(),
-                            data.byte_length(),
-                            additional_data.bytes(),
-                            additional_data.byte_length());
+    ok = EVP_AEAD_CTX_seal(&ctx,
+                           Uint8VectorStart(buffer),
+                           &len,
+                           buffer->size(),
+                           iv.bytes(),
+                           iv.byte_length(),
+                           data.bytes(),
+                           data.byte_length(),
+                           additional_data.bytes(),
+                           additional_data.byte_length());
   }
 
-  if (len < 0)
+  if (!ok)
     return Status::OperationError();
   buffer->resize(len);
   return Status::Success();
 }
 
 class AesGcmImplementation : public AesAlgorithm {
  public:
   AesGcmImplementation() : AesAlgorithm("GCM") {}
 
   virtual Status Encrypt(const blink::WebCryptoAlgorithm& algorithm,
@@ skipping 13 matching lines @@
 
 }  // namespace
 
 AlgorithmImplementation* CreatePlatformAesGcmImplementation() {
   return new AesGcmImplementation;
 }
 
 }  // namespace webcrypto
 
 }  // namespace content