ChecksumHelper.java 文件源码

/**
 * Calculate and return the sha1 sum of an input stream
 *
 * @param in the input stream to calculate the sha1 sum of
 *
 * @return the sha1 sum
 *
 * @throws IOException if there was an error calculating the sha1 sum
 */
public static String calculateSha1(InputStream in) throws IOException {

    MessageDigest messageDigest;
    InputStream inputStream = null;
    try {
        messageDigest = MessageDigest.getInstance("SHA-1");
        inputStream = new BufferedInputStream(in);
        byte[] buffer = new byte[8192];
        int len = inputStream.read(buffer);

        while (len != -1) {
            messageDigest.update(buffer, 0, len);
            len = inputStream.read(buffer);
        }

        return(new HexBinaryAdapter().marshal(messageDigest.digest()));
    } catch (NoSuchAlgorithmException ex) {
        throw new IOException(ex);
    } finally {
        IOUtils.closeQuietly(inputStream);
    }
}