问题
Is it possible decrypt an encrypted RSA (or others, shouldn't matter) private keys using JCE and/or BouncyCastle provider (not using openssl bundle)?
I can read unencrypted keys just fine using PrivateKeyFactory.
Googling this gets me through examples of using PEMReader (from BC openssl bundle) that has a password applied to it, but - don't want to use openssl bundle, don't necessarily want to use PEM format, and I can decode PEM using PemReader (from provider bundle). It's what can I do with it afterwards is the question.
I'm looking for some mega-function, or a series thereof that can do it, i.e. I am not looking into parsing the ASN1 of the encrypted key, figuring out the encryption method, passing the input through the cipher, etc.
回答1:
If you have an encrypted PKCS#8 key in binary format (i.e. not in PEM format) the following code shows how to retrieve the private key:
public PrivateKey decryptKey(byte[] pkcs8Data, char[] password) throws Exception {
PBEKeySpec pbeSpec = new PBEKeySpec(password);
EncryptedPrivateKeyInfo pkinfo = new EncryptedPrivateKeyInfo(pkcs8Data);
SecretKeyFactory skf = SecretKeyFactory.getInstance(pkinfo.getAlgName());
Key secret = skf.generateSecret(pbeSpec);
PKCS8EncodedKeySpec keySpec = pkinfo.getKeySpec(secret);
KeyFactory kf = KeyFactory.getInstance("RSA");
return kf.generatePrivate(keySpec);
}
If you have a PEM format, remove the header (first line), the footer(last line) et convert the remaining content from base64 to regular byte array.
来源:https://stackoverflow.com/questions/32306081/how-to-decrypt-a-private-key-in-java-without-bc-openssl