Zhang

src/main/java/edu/unl/cse/csce361/socket_chat/Base64Cipher.java

+package edu.unl.cse.csce361.socket_chat;
+
+import java.io.UnsupportedEncodingException;
+import java.util.Base64;
+
+public class Base64Cipher implements Cipher {
+	public String encipher(String plaintext, String key) {
+		String ciphertext = null;
+		try {
+			ciphertext = Base64.getEncoder().encodeToString(plaintext.getBytes("UTF-16"));
+		} catch (UnsupportedEncodingException e) {
+			return "Error.WrongCipherSet Error84$"; // User will never type this.
+		}
+
+		return ciphertext;
+	}
+
+	public String decipher(String ciphertext, String key) {
+		String plaintext = null;
+		if (ciphertext.getBytes().length < 2 == false) {
+			try {
+				plaintext = new String(Base64.getDecoder().decode(ciphertext.getBytes()), "UTF-16");
+			} catch (UnsupportedEncodingException e) {
+				return "Error.WrongCipherSet Error84$";
+			}
+			return plaintext;
+		} else
+			return "Error.WrongCipherSet Error84$";
+
+	}
+}
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