如何使用用密码加密的私钥生成RSA密钥对？

Question

我想生成口令加密的专用密钥PKCS8格式，我尝试使用此代码：

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(); 
} 

但我不知道如何使用3DES加密密码与OpenSSL的格式兼容。

Answer 1

我知道这是一个有点晚，但我也一直在寻找一种方式来做到这一点，而我在寻找，我发现你的问题，现在我已经找到一种方法来做到这一点，我决定回来份额这样的：

// 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(); 

此示例代码是基于如下因素代码，我发现：http://www.jensign.com/JavaScience/PEM/EncPrivKeyInfo/EncPrivKeyInfo.java

但如下因素的资源也帮助我了解一个更好一点：http://java.sun.com/j2se/1.4.2/docs/guide/security/jce/JCERefGuide.html