| /* |
| * Copyright 2014 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. |
| */ |
| |
| // Author: jcrowell@google.com (Jeffrey Crowell) |
| |
| #include "pagespeed/kernel/base/sha1_signature.h" |
| |
| #include <algorithm> |
| |
| #include "pagespeed/kernel/base/string.h" |
| #include "pagespeed/kernel/base/string_util.h" |
| #if ENABLE_URL_SIGNATURES |
| #include <openssl/hmac.h> |
| #endif |
| |
| namespace net_instaweb { |
| |
| namespace { |
| |
| int CeilDivide(int numerator, int denominator) { |
| int num = numerator + denominator - 1; |
| return num / denominator; |
| } |
| |
| } // namespace |
| |
| SHA1Signature::SHA1Signature() |
| : Signature(), max_chars_(kDefaultSignatureSize) {} |
| |
| SHA1Signature::SHA1Signature(int signature_size) |
| : Signature(), max_chars_(signature_size) {} |
| |
| SHA1Signature::~SHA1Signature() {} |
| |
| GoogleString SHA1Signature::RawSign(StringPiece key, StringPiece data) const { |
| unsigned int signature_length; |
| #if ENABLE_URL_SIGNATURES |
| unsigned char* md = HMAC(EVP_sha1(), key.data(), key.size(), |
| reinterpret_cast<const unsigned char*>(data.data()), |
| data.size(), NULL, &signature_length); |
| const unsigned char* result = const_cast<const unsigned char*>(md); |
| #else |
| const unsigned char result[kSHA1NumBytes] = {0}; |
| signature_length = kSHA1NumBytes; |
| #endif |
| GoogleString signature(reinterpret_cast<const char*>(result), |
| signature_length); |
| return signature; |
| } |
| |
| int SHA1Signature::RawSignatureSizeInBytes() const { |
| return kSHA1NumBytes; |
| } |
| |
| int SHA1Signature::SignatureSizeInChars() const { |
| int max_length = ComputeSizeFromNumberOfBytes(RawSignatureSizeInBytes()); |
| return std::min(max_length, max_chars_); |
| } |
| |
| |
| int SHA1Signature::ComputeSizeFromNumberOfBytes(int num_bytes) { |
| return CeilDivide(num_bytes * 4, 3); |
| } |
| |
| } // namespace net_instaweb |