java – 如何使用密码加密的私钥生成RSA keyPair？

发布时间：2020-12-14 05:18:15 所属栏目：Java 来源：网络整理

导读：我想生成密钥加密的私钥PKCS8格式,我尝试使用这个代码： String password = "123456";KeyPairGenerator gen = KeyPairGenerator.getInstance("RSA");gen.initialize(2048);KeyPair key = gen.generateKeyPair();PrivateKey privateKey = key.getPrivate();Pu

我想生成密钥加密的私钥PKCS8格式,我尝试使用这个代码：

String password = "123456";
KeyPairGenerator gen = KeyPairGenerator.getInstance("RSA");
gen.initialize(2048);
KeyPair key = gen.generateKeyPair();
PrivateKey privateKey = key.getPrivate();
PublicKey publicKey = key.getPublic();

FileOutputStream pvt = new FileOutputStream("d:pvt123456.der");
try {
    pvt.write(privateKey.getEncoded());
    pvt.flush();
} finally {
    pvt.close();
}
FileOutputStream pub = new FileOutputStream("d:pub123456.der");
try {
    pub.write(publicKey.getEncoded());
    pub.flush();
} finally {
    pub.close();
}

但是我不知道如何使用3des加密密码以与openssl格式兼容.

解决方法

我知道这有点迟了,但是我也一直在寻找一种方法来做到这一点,而我正在搜索我发现你的问题,现在我已经找到了一个方法,我决定回来分享一下：

// generate key pair

KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
keyPairGenerator.initialize(1024);
KeyPair keyPair = keyPairGenerator.genKeyPair();

// extract the encoded private key,this is an unencrypted PKCS#8 private key
byte[] encodedprivkey = keyPair.getPrivate().getEncoded();

// We must use a PasswordBasedEncryption algorithm in order to encrypt the private key,you may use any common algorithm supported by openssl,you can check them in the openssl documentation http://www.openssl.org/docs/apps/pkcs8.html
String MYPBEALG = "PBEWithSHA1AndDESede";
String password = "pleaseChangeit!";

int count = 20;// hash iteration count
SecureRandom random = new SecureRandom();
byte[] salt = new byte[8];
random.nextBytes(salt);

// Create PBE parameter set
PBEParameterSpec pbeParamSpec = new PBEParameterSpec(salt,count);
PBEKeySpec pbeKeySpec = new PBEKeySpec(password.toCharArray());
SecretKeyFactory keyFac = SecretKeyFactory.getInstance(MYPBEALG);
SecretKey pbeKey = keyFac.generateSecret(pbeKeySpec);

Cipher pbeCipher = Cipher.getInstance(MYPBEALG);

// Initialize PBE Cipher with key and parameters
pbeCipher.init(Cipher.ENCRYPT_MODE,pbeKey,pbeParamSpec);

// Encrypt the encoded Private Key with the PBE key
byte[] ciphertext = pbeCipher.doFinal(encodedprivkey);

// Now construct  PKCS #8 EncryptedPrivateKeyInfo object
AlgorithmParameters algparms = AlgorithmParameters.getInstance(MYPBEALG);
algparms.init(pbeParamSpec);
EncryptedPrivateKeyInfo encinfo = new EncryptedPrivateKeyInfo(algparms,ciphertext);

// and here we have it! a DER encoded PKCS#8 encrypted key!
byte[] encryptedPkcs8 = encinfo.getEncoded();

这个示例代码基于我发现的以下代码：http://www.jensign.com/JavaScience/PEM/EncPrivKeyInfo/EncPrivKeyInfo.java

但是资源丰富也帮助我了解一点点：http://java.sun.com/j2se/1.4.2/docs/guide/security/jce/JCERefGuide.html

（编辑：李大同）

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