java rsa 私钥解密

java rsa 私钥解密

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/*** Description:** @author 诸葛小猿* @date 2020-08-21*/

@Slf4j

public class SignAndEncryptTest {

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public static final String SIGN_ALGORITHMS = "SHA1WithRSA";

public static final String CHATSET = "utf-8";

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public static String publicKey_A = "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAsnen01CdQc2zh/HihCNNYI6u7AFXf/NrZ/9auPvFsJcK1cWj5EFBU3lrts2OTvrmYVurhABg2g/Ya7glzUt6DwUojHOWtpwFxSH1v7FUJMvxDsbd4GXKRdWqMkqkcCMQYDpGpshbL3IAWYIw6pgnBcKksbzkDrZCZMAyHa1bB3zh5uEm9mcrRlBUGirbPNVt++3ztIfdc4Vp5hbw++daNMFr/VGDohMVg3Dlk4ZktDgHc5nakXkE8hSr6UDTw45JpfZZ0dP9XTi/CSVQdoYD+dsJIZ8uletlbrErRfZEJNx/k0w88P4kfGteNBGhlzzVo45tMkHT33O8QB6JxI4xVQIDAQAB";

public static String privateKey_A = "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";

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public static String publicKey_B = "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAv8GjRufWGPI7Xe6caZ5h5PbnRIQVzD4P1gDjKZaibcxcApGEaqFkT3Am2U6iKv6paELuwxy+dUL1Jvbs09QljuHgDB9SV0VxSM5LscpCmWJ5P1V6Y/QiholCQHCFR6ok6oE2HWGRw/bPQWr/gHfa2zNPu+CB64cbOxLHIQYIRji47tyywAL5ABhF1msZY2vW8xaFKHGq74sxNpf8s0NUnRnVRANjHtuDa/zvrHim45gqBWg+3gPVSQyPU3ydMoj0AiORJQmqprHaZDB7BufpTEZA6I2WElsKJcsGMdwfSd1s0B1iCzrkMmT30n/XXxyw8qQGsvJvQ2V90QiAV9bV+wIDAQAB";

public static String privateKey_B = "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";

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// 封装发送的消息 public static Map communicationParams = null;

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public static void main(String[] args) {

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// A给B发消息 ASendMsgToB();

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// B接收来自A的消息 BReceiveFromA();

}

​

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/*** A给B发消息，首先A-B交换公钥，A拥有 privateKey_A 和 publicKey_B** A使用publicKey_B加密消息，再使用privateKey_A对密文签名，然后将密文和签名发给B*/

public static void ASendMsgToB(){

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// 消息明文 String msg = "你好";

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// 加密 String encryptMsg = encryptByPublicKey(msg,publicKey_B);

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// 签名 String sign = signByPrivateKey(encryptMsg,privateKey_A);

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// 发送消息 communicationParams = new HashMap();

communicationParams.put("encryptMsg",encryptMsg);

communicationParams.put("sign",sign);

log.info("A发送给B的消息:{}", JSONString(communicationParams));

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log.info("-------------------------------------------------");

}

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/*** B接收A的消息，首先A-B交换公钥，B拥有 privateKey_B 和 publicKey_A** B收到消息后，先使用publicKey_A验签，再使用privateKey_B解密*/

public static void BReceiveFromA(){

// 接收消息 Map receiveMsg = communicationParams;

log.info("B接收到A的消息:{}", JSONString(receiveMsg));

String sign = ("sign");

String encryptMsg = ("encryptMsg");

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// 验签 Boolean tf = verifySignPublicKey(encryptMsg,publicKey_A,sign);

if(tf){

log.info("验签通过，说明这个信息是B认可的用户发来的");

}

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// 解密 String msg = decryptByPrivateKey(encryptMsg,privateKey_B);

log.info("解密成功，说明这个信息就是发给B的");

​

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log.info("B收到的消息:{}", msg);

}

​

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/*** RSA签名* @param content 待签名数据* @param privateKey 商户私钥* @return 签名值*/

public static String signByPrivateKey(String content, String privateKey)

{

try{

PKCS8EncodedKeySpec priPKCS8 = new PKCS8EncodedKeySpec( Base64.decode(privateKey) );

KeyFactory keyf = Instance("RSA");

PrivateKey priKey = atePrivate(priPKCS8);

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Signature signature = Instance(SIGN_ALGORITHMS);

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signature.initSign(priKey);

signature.update( Bytes(CHATSET) );

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byte[] signed = signature.sign();

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de(signed);

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}catch (Exception e){

<(e.getMessage(), e);

}

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return null;

}

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/*** RSA验签名检查* @param content 待签名数据* @param sign 签名值* @param publicKey 公钥* @return 布尔值*/

public static boolean verifySignPublicKey(String content, String publicKey, String sign)

{

try{

KeyFactory keyFactory = Instance("RSA");

byte[] encodedKey = Base64.decode(publicKey);

PublicKey pubKey = atePublic(new X509EncodedKeySpec(encodedKey));

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Signature signature = Instance(SIGN_ALGORITHMS);

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signature.initVerify(pubKey);

signature.update( Bytes(CHATSET) );

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boolean bverify = signature.verify( Base64.decode(sign) );

return bverify;

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}catch (Exception e){

<(e.getMessage(), e);

}

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return false;

}

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/*** RSA公钥加密* @param str 加密字符串* @param publicKey 公钥* @return 密文*/

public static String encryptByPublicKey( String str, String publicKey ) {

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try{

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//base64编码的公钥 byte[] decoded = dec.binary.Base64.decodeBase64(publicKey);

RSAPublicKey pubKey = (RSAPublicKey) Instance("RSA").generatePublic(new X509EncodedKeySpec(decoded));

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//RSA加密 Cipher cipher = Instance("RSA");

cipher.init(Cipher.ENCRYPT_MODE, pubKey);

String outStr = dec.deBase64String(cipher.Bytes(CHATSET)));

return outStr;

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}catch (Exception e) {

<(e.getMessage(), e);

}

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return null;

}

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/*** RSA私钥解密* @param str 加密字符串* @param privateKey 私钥* @return 明文*/

public static String decryptByPrivateKey(String str, String privateKey){

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try{

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//64位解码加密后的字符串 byte[] inputByte = dec.binary.Base64.Bytes(CHATSET));

//base64编码的私钥 byte[] decoded = dec.binary.Base64.decodeBase64(privateKey);

RSAPrivateKey priKey = (RSAPrivateKey) Instance("RSA").generatePrivate(new PKCS8EncodedKeySpec(decoded));

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//RSA解密 Cipher cipher = Instance("RSA");

cipher.init(Cipher.DECRYPT_MODE, priKey);

String outStr = new String(cipher.doFinal(inputByte));

return outStr;

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}catch (Exception e) {

<(e.getMessage(), e);

}

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return null;

}

​

}

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