org.bouncycastle.jcajce.spec.OpenSSHPrivateKeySpec Maven / Gradle / Ivy
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package org.bouncycastle.jcajce.spec;
import java.security.spec.EncodedKeySpec;
/**
* OpenSSHPrivateKeySpec holds and encoded OpenSSH private key.
* The format of the key can be either ASN.1 or OpenSSH.
*/
public class OpenSSHPrivateKeySpec
extends EncodedKeySpec
{
private final String format;
/**
* Accept an encoded key and determine the format.
*
* The encoded key should be the Base64 decoded blob between the "---BEGIN and ---END" markers.
* This constructor will endeavour to find the OpenSSH format magic value. If it can not then it
* will default to ASN.1. It does not attempt to validate the ASN.1
*
* Example:
* OpenSSHPrivateKeySpec privSpec = new OpenSSHPrivateKeySpec(rawPriv);
*
* KeyFactory kpf = KeyFactory.getInstance("RSA", "BC");
* PrivateKey prk = kpf.generatePrivate(privSpec);
*
* OpenSSHPrivateKeySpec rcPrivateSpec = kpf.getKeySpec(prk, OpenSSHPrivateKeySpec.class);
*
* @param encodedKey The encoded key.
*/
public OpenSSHPrivateKeySpec(byte[] encodedKey)
{
super(encodedKey);
if (encodedKey[0] == 0x30) // DER SEQUENCE
{
format = "ASN.1";
}
else if (encodedKey[0] == 'o')
{
format = "OpenSSH";
}
else
{
throw new IllegalArgumentException("unknown byte encoding");
}
}
/**
* Return the format, either OpenSSH for the OpenSSH propriety format or ASN.1.
*
* @return the format OpenSSH or ASN.1
*/
public String getFormat()
{
return format;
}
}