Java实现AES加密解密

转自http://blog.csdn.net/heqiangflytosky/article/details/51721122

public class AESUtils {
private static final String KEY_ALGORITHM = “AES”;

private static final Charset charset = Charset.forName( "utf-8" );

private static String decrypt( byte[] data, byte[] key ) {
    try {
        Key k = new SecretKeySpec( key, KEY_ALGORITHM );
        Cipher cipher = Cipher.getInstance( KEY_ALGORITHM );
        cipher.init( Cipher.DECRYPT_MODE, k );
        return new String( cipher.doFinal( data ), charset );
    } catch( Exception e ) {
        throw new RuntimeException( e );
    }
}

public static String decrypt( String data, String key ) {
    return decrypt( parseHexStr2Byte( data ), key.getBytes( charset ) );
}

public static byte[] encrypt( byte[] data, byte[] key ) {
    try {
        Key k = new SecretKeySpec( key, KEY_ALGORITHM );
        Cipher cipher = Cipher.getInstance( KEY_ALGORITHM );
        cipher.init( Cipher.ENCRYPT_MODE, k );
        return cipher.doFinal( data );
    } catch( Exception e ) {
        throw new RuntimeException( e );
    }
}

public static String encrypt( String data, String key ) {
    byte[] dataBytes = data.getBytes( charset );
    byte[] keyBytes = key.getBytes( charset );
    return parseByte2HexStr( encrypt( dataBytes, keyBytes ) );
}

public static byte[] parseHexStr2Byte( String hexStr ) {
    byte[] result = new byte[ hexStr.length() / 2 ];
    for( int i = 0; i < hexStr.length() / 2; i++ ) {
        int high = Integer.parseInt( hexStr.substring( i * 2, i * 2 + 1 ), 16 );
        int low = Integer.parseInt( hexStr.substring( i * 2 + 1, i * 2 + 2 ), 16 );
        result[ i ] = ( byte )( high * 16 + low );
    }
    return result;
}

public static String parseByte2HexStr( byte buf[] ) {
    StringBuilder sb = new StringBuilder();
    for( int i = 0; i < buf.length; i++ ) {
        String hex = Integer.toHexString( buf[ i ] & 0xFF );
        if( hex.length() == 1 ) {
            hex = '0' + hex;
        }
        sb.append( hex.toUpperCase() );
    }
    return sb.toString();
}

}