C#,Java,MD5加密对等实现

1.c#实现

  
    /*
    *加密生成MD5
    */
     public static String MD5(string s)

        {
            char[] hexDigits = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
            MD5 md5 = new MD5CryptoServiceProvider();
            byte[] inputBytes = System.Text.Encoding.UTF8.GetBytes(s);
            byte[] result = md5.ComputeHash(inputBytes);
            int j = result.Length;
            char[] str = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; i++)
            {
                byte byte0 = result[i];
                str[k++] = hexDigits[byte0 >> 4 & 0xf];
                str[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(str);
        } 

2.Java实现

public final class DefaultPasswordEncoder {

    private static final char[] HEX_DIGITS = {'0', '1', '2', '3', '4', '5', '6', '7', '8',
                                                '9', 'a', 'b', 'c', 'd', 'e', 'f'};

  
    private final String encodingAlgorithm="MD5";

    private final String characterEncoding="UTF-8";
  
    /*
    *加密生成MD5
    */
    public String encode(final String password) {
        if (password == null) {
            return null;
        }

        try {
            MessageDigest messageDigest = MessageDigest
                .getInstance(this.encodingAlgorithm);

            if (StringUtils.hasText(this.characterEncoding)) {
                messageDigest.update(password.getBytes(this.characterEncoding));
            } else {
                messageDigest.update(password.getBytes());
            }


            final byte[] digest = messageDigest.digest();

            return getFormattedText(digest);
        } catch (final NoSuchAlgorithmException e) {
            throw new SecurityException(e);
        } catch (final UnsupportedEncodingException e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * Takes the raw bytes from the digest and formats them correct.
     *
     * @param bytes the raw bytes from the digest.
     * @return the formatted bytes.
     */
    private String getFormattedText(final byte[] bytes) {
        final StringBuilder buf = new StringBuilder(bytes.length * 2);

        for (int j = 0; j < bytes.length; j++) {
            buf.append(HEX_DIGITS[(bytes[j] >> 4) & 0x0f]);
            buf.append(HEX_DIGITS[bytes[j] & 0x0f]);
        }
        return buf.toString();
    }

}