sviolet.thistle.util.crypto.base.BaseCryptoUtils Maven / Gradle / Ivy
/*
* Copyright (C) 2015-2018 S.Violet
*
* 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.
*
* Project GitHub: https://github.com/shepherdviolet/thistle
* Email: [email protected]
*/
package sviolet.thistle.util.crypto.base;
/**
* 基本逻辑
*
* Not recommended for direct use
*
* 不建议直接使用
*
* Cipher/Signature/MessageDigest线程不安全!!!
*
* @author S.Violet
*/
public class BaseCryptoUtils {
public static final byte SM2_CIPHER_TEXT_PREFIX_UNCOMPRESSED = 0x04;
/**
* 将坐标(X/Y)转为ASN.1编码的坐标数据(非压缩)
* @param xBytes 坐标X, 字节形式(bigInteger.toByteArray()获得)
* @param yBytes 坐标Y, 字节形式(bigInteger.toByteArray()获得)
* @return ASN.1编码的坐标数据(非压缩)
*/
public static byte[] pointToASN1Encoding(byte[] xBytes, byte[] yBytes) {
if (xBytes == null) {
throw new NullPointerException("xBytes == null");
}
if (yBytes == null) {
throw new NullPointerException("yBytes == null");
}
byte[] asn1Encoding = new byte[1 + xBytes.length + yBytes.length];
asn1Encoding[0] = SM2_CIPHER_TEXT_PREFIX_UNCOMPRESSED;
System.arraycopy(xBytes, 0, asn1Encoding, 1, xBytes.length);
System.arraycopy(yBytes, 0, asn1Encoding, 1 + xBytes.length, yBytes.length);
return asn1Encoding;
}
}