lib/bcc/Sha1Helper.cpp

/*
 * copyright 2010, the android open source project
 *
 * 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.
 */

#define LOG_TAG "bcc"
#include <cutils/log.h>

#include "Sha1Helper.h"

#include "FileHandle.h"

#include <string.h>

#include <sha1.h>

namespace bcc {


unsigned char sha1LibBCC[20];
unsigned char sha1LibRS[20];


char const *pathLibBCC = "/system/lib/libbcc.so";
char const *pathLibRS = "/system/lib/libRS.so";


void calcSHA1(unsigned char *result, char const *data, size_t size) {
  SHA1_CTX hashContext;

  SHA1Init(&hashContext);
  SHA1Update(&hashContext,
             reinterpret_cast<const unsigned char *>(data),
             static_cast<unsigned long>(size));

  SHA1Final(result, &hashContext);
}


void calcFileSHA1(unsigned char *result, char const *filename) {
  FileHandle file;

  if (file.open(filename, OpenMode::Read) < 0) {
    LOGE("Unable to calculate the sha1 checksum of %s\n", filename);
    memset(result, '\0', 20);
    return;
  }

  SHA1_CTX hashContext;
  SHA1Init(&hashContext);

  char buf[256];
  while (true) {
    ssize_t nread = file.read(buf, sizeof(buf));
    
    if (nread < 0) {
      break;
    }

    SHA1Update(&hashContext,
               reinterpret_cast<unsigned char *>(buf),
               static_cast<unsigned long>(nread));

    if ((size_t)nread < sizeof(buf)) {
      // finished.
      break;
    }
  }

  SHA1Final(result, &hashContext);
}

} // namespace bcc