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I am writing a small piece of code which reads public and private key stored in .pem file. I am using the following commands to generate the keys.
Below command to generate pair of key.
$openssl genrsa -out mykey.pem 2048
This command to generate the private key
$openssl pkcs8 -topk8 -inform PEM -outform PEM -in mykey.pem \
-out private_key.pem -nocrypt
and this command to get the public key.
$ openssl rsa -in mykey.pem -pubout -outform DER -out public_key.der
I have written two methods which reads the private key and public key respectively.
public PrivateKey getPemPrivateKey(String filename, String algorithm) throws Exception {
File f = new File(filename);
FileInputStream fis = new FileInputStream(f);
DataInputStream dis = new DataInputStream(fis);
byte[] keyBytes = new byte[(int) f.length()];
dis.readFully(keyBytes);
dis.close();
String temp = new String(keyBytes);
String privKeyPEM = temp.replace("-----BEGIN PRIVATE KEY-----\n", "");
privKeyPEM = privKeyPEM.replace("-----END PRIVATE KEY-----", "");
//System.out.println("Private key\n"+privKeyPEM);
Base64 b64 = new Base64();
byte [] decoded = b64.decode(privKeyPEM);
PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(decoded);
KeyFactory kf = KeyFactory.getInstance(algorithm);
return kf.generatePrivate(spec);
}
public PublicKey getPemPublicKey(String filename, String algorithm) throws Exception {
File f = new File(filename);
FileInputStream fis = new FileInputStream(f);
DataInputStream dis = new DataInputStream(fis);
byte[] keyBytes = new byte[(int) f.length()];
dis.readFully(keyBytes);
dis.close();
String temp = new String(keyBytes);
String publicKeyPEM = temp.replace("-----BEGIN PUBLIC KEY-----\n", "");
publicKeyPEM = publicKeyPEM.replace("-----END PUBLIC KEY-----", "");
Base64 b64 = new Base64();
byte [] decoded = b64.decode(publicKeyPEM);
X509EncodedKeySpec spec =
new X509EncodedKeySpec(decoded);
KeyFactory kf = KeyFactory.getInstance(algorithm);
return kf.generatePublic(spec);
}
I feel like this is a naive way of doing it. I couldn't get any better way of doing it over internet. Can anyone suggest me what is the best way of writing the same code to handle the generic cases. I don' want to use any kind of third party library.
I have very basic knowledge of singing/encrypting and hardly use any java security APIs. So if I am not making sense somewhere then please point out.
I think in your private key definition, You should replace:
with:
Look your
opensslcommand:And the java Exception:
One option is to use bouncycastle's PEMParser:
Here is an example of using the Parser test code:
Java 9+:
Java 8:
replace the
in.readAllBytes()call with a call to this:thanks to Daniel for noticing API compatibility issues
Java libs makes it almost a one liner to read the public cert, as generated by openssl:
But, o hell, reading the private key was problematic:
RSAPrivateKey.see this: Final solution in kotlin
Try this class.
Well, my code is like yours, with little diferences...