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[英]How to import a private key into a Java keystore without knowning the password
[英]How to add a password to an existing private key in Java
假设我使用openssl创建了以前创建的私钥,但我决定不使用密码来保护它:
-----BEGIN RSA PRIVATE KEY-----
BASE64 ENCODED DATA
-----END RSA PRIVATE KEY-----
但后来我意识到我想保护它。
我知道如何使用openssl保护它,但我需要在Java中使用它。 可能吗 ?
首先从pem文件加载并解压缩pkcs#1未加密密钥
String pem = new String(Files.readAllBytes(Paths.get("rsa.key")));
String privateKeyPEM = pem.replace(
"-----BEGIN RSA PRIVATE KEY-----\n", "")
.replace("-----END RSA PRIVATE KEY-----", "");
byte[] encodedPrivateKey = Base64.getDecoder().decode(privateKeyPEM);
然后使用此代码的第二部分加密密钥(我已经包含它)
// 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(encodedPrivateKey);
// 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();
使用以下代码进行解密(从此处取消)
public static PrivateKey getPrivateKey(byte[] encryptedPkcs8, String passwd) throws Exception{
EncryptedPrivateKeyInfo encryptPKInfo = new EncryptedPrivateKeyInfo(encryptedPkcs8);
Cipher cipher = Cipher.getInstance(encryptPKInfo.getAlgName());
PBEKeySpec pbeKeySpec = new PBEKeySpec(passwd.toCharArray());
SecretKeyFactory secFac = SecretKeyFactory.getInstance(encryptPKInfo.getAlgName());
Key pbeKey = secFac.generateSecret(pbeKeySpec);
AlgorithmParameters algParams = encryptPKInfo.getAlgParameters();
cipher.init(Cipher.DECRYPT_MODE, pbeKey, algParams);
KeySpec pkcs8KeySpec = encryptPKInfo.getKeySpec(cipher);
KeyFactory kf = KeyFactory.getInstance(ALGORITHM);
return kf.generatePrivate(pkcs8KeySpec);
}
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