56 lines
1.8 KiB
Java
56 lines
1.8 KiB
Java
package com.example.bankcards.util;
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import java.util.Base64;
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import javax.crypto.Cipher;
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import javax.crypto.spec.SecretKeySpec;
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import org.springframework.beans.factory.annotation.Value;
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import org.springframework.stereotype.Component;
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@Component
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public class CardEncryptionUtil {
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@Value("${app.card.encryption-key}")
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private String encryptionKey;
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private static final String ALGORITHM = "AES";
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public String encrypt(String cardNumber) {
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try {
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SecretKeySpec keySpec = new SecretKeySpec(
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encryptionKey.getBytes(),
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ALGORITHM
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);
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Cipher cipher = Cipher.getInstance(ALGORITHM);
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cipher.init(Cipher.ENCRYPT_MODE, keySpec);
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byte[] encrypted = cipher.doFinal(cardNumber.getBytes());
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return Base64.getEncoder().encodeToString(encrypted);
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} catch (Exception e) {
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throw new RuntimeException("Failed to encrypt card number", e);
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}
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}
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public String decrypt(String encryptedCardNumber) {
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try {
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SecretKeySpec keySpec = new SecretKeySpec(
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encryptionKey.getBytes(),
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ALGORITHM
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);
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Cipher cipher = Cipher.getInstance(ALGORITHM);
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cipher.init(Cipher.DECRYPT_MODE, keySpec);
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byte[] decoded = Base64.getDecoder().decode(encryptedCardNumber);
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byte[] decrypted = cipher.doFinal(decoded);
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return new String(decrypted);
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} catch (Exception e) {
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throw new RuntimeException("Failed to decrypt card number", e);
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}
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}
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public String mask(String cardNumber) {
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if (cardNumber == null || cardNumber.length() < 4) {
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return "****";
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}
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String lastFour = cardNumber.substring(cardNumber.length() - 4);
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return "**** **** **** " + lastFour;
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}
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}
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