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国密SM2,SM3 Java实现

Java 100.00%

java sm2

sm2java's Introduction

SM2Java

国密SM2,SM3 Java实现

实现了SM2中如下4部分

1.生成密钥对

2.签名与验签

3.密钥协商

4.公钥加解密

杂凑算法采用SM3 密钥派生算法参考国密办文档中的KDF实现

具体可查看resouces中三个文档

sm2java's People

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bjgxjob alexlo2000 mora-5-love flyree99 wm5588 garfieid alstomli chenbravery zxm0228 liaohaomin cryptofanorg bruce-conan zmr961006 halostudio amaminghuang min1129 aswans xubinchencs dushitaoyuan dongcb678 zhangqunshi hongruixing yaodingw zhonghuihuo geek-dong ztj666 zggg blueying 93panda chenguangwu izanamilam 13851809588 kaiserfan awen162 xzhiqin noahbentusi kimifdw yantystone wang415999018 sniperxiaojun feinimouse liupeng1105 huangxt315 sun1122 shuedit milkzs zhenwei12138 liushui0528 zhanzr akay-99 mswdwk bloodkirin yorkezhong liuyong199311080810 pursue2020 apple006 chenpei97 zhanpengcarry lihua20103181 zhangmizuki howiechang7 cutoutsy ranchonono weieast freedomfu junkinglee shiyanshiguize li-shengming ksqeib445 tavia0728 waveletgreen niushengwei anglabace huhaku caoxiaoyugit jriy zwp365 tcsong0921 udld leesonchen x-cy mel0nkid junhaocoding lic-twrightjay yunlongn ssytech stevenxu1992 yangzixu-user xuchengdong eagermind sunhuwh unkownc 271560sj ymd1223 changjiangaa sunyotech nianling ez-max hehetown bobo-boom

sm2java's Issues

SM3对大文件提取hash内存溢出

所有分支最终都是通过获取完整的byte[]来生成hash，处理大文件会溢出，可以先获取输入流，每次读取64字节，最后一次不足64再做padding补齐

BigInteger 在转化为byte数组时会会出现一个补位

BigInteger 在转化为byte数组时会会出现一个补位，导致最后的sm3-Hash的计算作物，ZA计算错误

需要在计算sm3杂凑值时，做如下处理

byte[] array = bigInteger.toByteArray();
if (array[0] == 0) {
    byte[] tmp = new byte[array.length - 1];
    System.arraycopy(array, 1, tmp, 0, tmp.length);
    array = tmp;
}

SM2.java中的byte[] ZA(String IDA,Ecpoint aPublicKey)中处理

//这一行的sm3hash中的参数都要做上面的处理
byte[] ZA=sm3hash(............................);

链接
BigInteger to byte[]

IDA

USERID说明

请参阅SM2椭圆曲线公钥密码算法-P54 用户其他信息一栏。
USERID非IDa

设用户A的身份是：[email protected]。用ASCII编码记ID A :
414C 49434531 32334059 41484F4F 2E434F4D。ENTL A =0090。

https://github.com/hyfree/SM2_SM3_SM4Encrypt/tree/add_pdf/pdf

怎么在sm2密钥协商时自定义公钥和私钥？不用sm2自己生成的。

实例化ECPoiint

您好，我已经有正确的公私钥对，公钥的坐标记作(x,y)。请问在您的代码中，怎么使用已知的公钥坐标正确的实例化 ECPoint PublicKey?
谢谢！

使用openssl中sm2算法生成的公私钥，用importPublicKey和importPrivateKey方法，会报错：
“Exception in thread "main" java.lang.IllegalArgumentException: Invalid point encoding 0x30
at org.bouncycastle.math.ec.ECCurve.decodePoint(Unknown Source)”

计算 ZA 的问题

byte[] ENTLA = new byte[] { (byte) (entlenA & 0xFF00), (byte) (entlenA & 0x00FF) };
是不是应该是
byte[] ENTLA = new byte[] { (byte) (entlenA>>8 & 0xFF), (byte) (entlenA & 0x00FF) };

something is running wrong !

BigInteger h = ecc_bc_spec.getH();
		if (h != null) {
			ECPoint S = publicKey.multiply(h);
			if (S.isInfinity())
				throw new IllegalStateException();
		}

in my environment it warns in ECPoint S = publicKey.multiply(h) of NULLPoint Exception , please check Exception in thread "main" java.lang.NullPointerException
at com.SM2.encrypt(SM2.java:146)
at com.SM2.main(SM2.java:816)