# 数据签名与验签

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{% content-ref url="qian-bao-di-zhi-gong-si-yao-sheng-cheng-suan-fa" %}
[qian-bao-di-zhi-gong-si-yao-sheng-cheng-suan-fa](https://datacbc.gitbook.io/index/kai-fa-zhi-nan/qian-bao-di-zhi-gong-si-yao-sheng-cheng-suan-fa)
{% endcontent-ref %}

### 数据签名

```java
/**
 * 通过私钥字节进行签名
 * @param data 待签名数据
 * @param privateKey 私钥字节
 * @return byte[] 数字签名
 * @throws Exception 异常
 */
public static byte[] sign(byte[] data, byte[] privateKey) throws Exception {
    PrivateKey priKey = ECDSAUtils.getPrivateKey(privateKey);
    // 实例化Signature
    Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM, BouncyCastleProvider.PROVIDER_NAME);
    // 初始化Signature
    signature.initSign(priKey);
    // 更新
    signature.update(data);
    // 签名
    return signature.sign();
}

```

### 签名数据验签

```java
/**
 * 通过公钥字节进行验签
 * @param data 待校验数据
 * @param publicKey 公钥字节
 * @param sign 数字签名-通过sign接口签名后的字节数据
 * @return boolean 校验成功返回true 失败返回false
 * @throws Exception 异常
 *
 */
public static boolean verify(byte[] data, byte[] publicKey, byte[] sign) throws Exception {
    //获取公钥
    PublicKey pubKey = ECDSAUtils.getPublicKey(publicKey);
    // 实例化Signature
    Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM, BouncyCastleProvider.PROVIDER_NAME);
    // 初始化Signature
    signature.initVerify(pubKey);
    // 更新
    signature.update(data);
    // 验证
    return signature.verify(sign);
}
```