Keep only base/extractor.[cc|h].

base/security/rsa.h

-// Copyright 2006-2009 Google Inc.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-// ========================================================================
-
-#ifndef OMAHA_COMMON_SECURITY_RSA_H__
-#define OMAHA_COMMON_SECURITY_RSA_H__
-
-#include <inttypes.h>
-
-class RSA {
- public:
-  typedef const uint32_t PublicKeyInstance[];
-  typedef const uint32_t* PublicKey;
-
-  // Public_key as montgomery precomputed array
-  explicit RSA(PublicKey public_key) : pkey_(public_key) {}
-
-  // Verifies a Google style RSA message recovery signature.
-  //
-  // sig[] signature to verify, big-endian byte array.
-  // sig_len length of sig[] in bytes.
-  // If verified successfully, output receives the recovered
-  // message and the function returns the number of bytes.
-  // If not successful, the function returns 0.
-  // (empty message is not a useful message)
-  int verify(const uint8_t* sig, int sig_len,
-             void* output, int output_max) const;
-
-  // Hybrid encrypt message.
-  //
-  // output_max should be at least encryptedSize(msg_len)
-  // Returns 0 on failure, # output bytes on success.
-  int encrypt(const uint8_t* msg, int msg_len,
-              const void* seed, int seed_len,
-              uint8_t* output, int output_max) const;
-
-  int encryptedSize(int len) const {
-    return len + 1 + 4 + size();
-  }
-
-  // Performs in-place public key exponentiation.
-  //
-  // Input_len should match size of modulus in bytes.
-  // Returns 0 on failure, # of bytes written on success.
-  int raw(uint8_t* input, int input_len) const;
-
-  int version() const { return pkey_[0]; }
-  int size() const { return pkey_[1] * 4; }
-
- private:
-  const PublicKey pkey_;
-  static const int kMaxWords = 64;
-};
-
-#endif  // OMAHA_COMMON_SECURITY_RSA_H__