Invoking a Java Method from Peoplecode

Question

Hello,
We are tasked to do a Single Sign On from a third-party to PeopleSoft HRHD using 3DES encryption method based from the email of the user from the third party. We managed to get the java program that was used to encrypt the email and use this to process the decryption on the Peoplesoft side.
First, are we correct in enabling the SignOn Peoplecode and then creating a Record Peoplecode that process the encrypted string that was passed via the URL?
Supposing we are correct in this first step, how do we call this java method? We have placed the java class in the PS_HOME/appserv/classes directory and we are somehow stuck on this part of the Peoplecode.
<Peoplecode>
&oDecrypt = CreateJavaObject("SSOCrpyto");
&strDecEmail=&oDecrypt.decryptString(&strEncEmail);
The decryptString part of the Java class is constructed like this.
public String decryptString(byte[] message) throws Exception {
...code here...
We are not familiar on how the parameter is passed when the datatype in java is an array of byte[] (If I understood it correctly).
Thank you.
Jeremy Leung
Edited by: 934351 on May 15, 2012 12:36 AM

Answer 1

Hello Hakan and Jim. Thank you for your replies. I, however, was wondering where do the method decryptString come in, in the Peoplecode? Pardon me if I post the entire Java class here. I am not very well-versed with the Java language, but upon reading most Java-related programs regarding Encryption/Decryption they are identical with the Java class pasted below.
import java.security.MessageDigest;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
public class SAPSSOCrypto {
     public byte[] encrypt(String message) throws Exception {
          final MessageDigest md = MessageDigest.getInstance("md5");
          final byte[] digestOfPassword =
               md.digest("password".getBytes("utf-8"));
          final byte[] keyBytes = new byte[24];//Arrays.copyOf(digestOfPassword, 24);
          System.arraycopy(digestOfPassword,0,keyBytes,0,digestOfPassword.length);
          for (int j = 0, k = 16; j < 8;) {
               keyBytes[k++] = keyBytes[j++];
          final SecretKey key = new SecretKeySpec(keyBytes, "DESede");
          final IvParameterSpec iv = new IvParameterSpec(new byte[8]);
          final Cipher cipher = Cipher.getInstance("DESede/CBC/PKCS5Padding");
          cipher.init(Cipher.ENCRYPT_MODE, key, iv);
          final byte[] plainTextBytes = message.getBytes("utf-8");
          final byte[] cipherText = cipher.doFinal(plainTextBytes);
          // final String encodedCipherText = new sun.misc.BASE64Encoder()
          // .encode(cipherText);
          return cipherText;
     public String decryptString(byte[] message) throws Exception {
          final MessageDigest md = MessageDigest.getInstance("md5");
          final byte[] digestOfPassword =
               md.digest("password".getBytes("utf-8"));
          final byte[] keyBytes = new byte[24]; //Arrays.copyOf(digestOfPassword, 24);
          System.arraycopy(digestOfPassword,0,keyBytes,0,digestOfPassword.length);
          for (int j = 0, k = 16; j < 8;) {
               keyBytes[k++] = keyBytes[j++];
          final SecretKey key = new SecretKeySpec(keyBytes, "DESede");
          final IvParameterSpec iv = new IvParameterSpec(new byte[8]);
          final Cipher decipher = Cipher.getInstance("DESede/CBC/PKCS5Padding");
          decipher.init(Cipher.DECRYPT_MODE, key, iv);
          // final byte[] encData = new // sun.misc.BASE64Decoder().decodeBuffer(message);
          final byte[] plainText = decipher.doFinal(message);
          return new String(plainText, "UTF-8");
}