How do I Load an RSA Private Key from a File in Java for SAMLResponse Signing?

Load RSA Private Key from File in Java

For signing your SAMLResponse, you need to load your RSA private key from a file. Here's how you can do it:

1. Import the private key file:

<code class="java">File privKeyFile = new File("mykey.pem");
byte[] privKeyBytes = new byte[(int) privKeyFile.length()];
BufferedInputStream bis = new BufferedInputStream(new FileInputStream(privKeyFile));
bis.read(privKeyBytes);
bis.close();</code>

2. Convert the private key to PKCS8 format:

You need to convert your private key from PEM to PKCS8 format using the OpenSSL command:

openssl pkcs8 -topk8 -inform PEM -outform DER -in mykey.pem -nocrypt > pkcs8_key

This will generate a new file pkcs8_key in PKCS8 DER format.

3. Load the private key:

<code class="java">KeySpec ks = new PKCS8EncodedKeySpec(privKeyBytes);
RSAPrivateKey privKey = (RSAPrivateKey) keyFactory.generatePrivate(ks);</code>

Now you have successfully loaded your RSA private key in PKCS8 format and can use it to sign your SAMLResponse.

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