問題：
無法使用3DES 加密成功加密與字元解密串由於程式碼實作中反覆出現錯誤。
解決方案：
為了解決這個問題，讓我們分析一下提供的程式碼：
public class TripleDESTest {
// ...
public byte[] encrypt(String message) {
// ...
final byte[] plainTextBytes = message.getBytes("utf-8");
final byte[] cipherText = cipher.doFinal(plainTextBytes);
final String encodedCipherText = new sun.misc.BASE64Encoder().encode(cipherText);
return cipherText;
}
// ...
}Base64 編碼：誤解：
最初，程式碼包含行Final String generatedCipherText = new sun.misc.BASE64Encoder().encode(cipherText);用於在傳回密文之前對密文進行 Base64 編碼。但是，由於解密方法中未使用 Base64 編碼，因此密文應直接作為位元組數組傳回。
列印原始位元組數組：
The程式碼將加密和解密的資料列印為位元組數組：System.out.println(codedtext);和System. out.println(decodedtext);。這不會提供有意義的輸出，因為位元組數組不會呈現為人類可讀的值。若要顯示實際解密的文本，請使用 new String(plainText, "UTF-8") 將其轉換為字串。
修正的程式碼：
import java.security.MessageDigest;
import java.util.Arrays;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
public class TripleDESTest {
public static void main(String[] args) throws Exception {
String text = "kyle boon";
byte[] codedtext = new TripleDESTest().encrypt(text);
String decodedtext = new TripleDESTest().decrypt(codedtext);
System.out.println(decodedtext);
}
public byte[] encrypt(String message) throws Exception {
final MessageDigest md = MessageDigest.getInstance("md5");
final byte[] digestOfPassword = md.digest("HG58YZ3CR9"
.getBytes("utf-8"));
final byte[] keyBytes = Arrays.copyOf(digestOfPassword, 24);
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);
return cipherText;
}
public String decrypt(byte[] message) throws Exception {
final MessageDigest md = MessageDigest.getInstance("md5");
final byte[] digestOfPassword = md.digest("HG58YZ3CR9"
.getBytes("utf-8"));
final byte[] keyBytes = Arrays.copyOf(digestOfPassword, 24);
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[] plainText = decipher.doFinal(message);
return new String(plainText, "UTF-8");
}
}以上是為什麼我的 Java 3DES 加密/解密失敗？的詳細內容。更多資訊請關注PHP中文網其他相關文章！
