java pkcs加密解密如何操作

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猴君
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在Java中,使用PKCS#1和PKCS#8进行加密和解密操作,你可以使用java.security包中的Cipher类。以下是使用这两种标准进行加密和解密的示例代码:

  1. PKCS#1加密
import javax.crypto.Cipher; import javax.crypto.KeyGenerator; import javax.crypto.SecretKey; import java.security.NoSuchAlgorithmException; import java.util.Base64;  public class PKCS1Encryption {     public static void main(String[] args) throws NoSuchAlgorithmException {         // 生成RSA密钥对         KeyGenerator keyGenerator = KeyGenerator.getInstance("RSA");         keyGenerator.init(2048);         SecretKey secretKey = keyGenerator.generateKey();          // 使用PKCS#1填充模式进行加密         Cipher cipher = Cipher.getInstance("RSA");         cipher.init(Cipher.ENCRYPT_MODE, secretKey);         String plainText = "Hello, World!";         byte[] encryptedBytes = cipher.doFinal(plainText.getBytes());          // 输出加密后的Base64编码字符串         System.out.println("Encrypted text: " + Base64.getEncoder().encodeToString(encryptedBytes));     } } 
  1. PKCS#1解密
import javax.crypto.Cipher; import javax.crypto.SecretKey; import java.security.NoSuchAlgorithmException; import java.util.Base64;  public class PKCS1Decryption {     public static void main(String[] args) throws NoSuchAlgorithmException {         // 生成RSA密钥对(与加密时使用相同的密钥)         KeyGenerator keyGenerator = KeyGenerator.getInstance("RSA");         keyGenerator.init(2048);         SecretKey secretKey = keyGenerator.generateKey();          // 使用PKCS#1填充模式进行解密         Cipher cipher = Cipher.getInstance("RSA");         cipher.init(Cipher.DECRYPT_MODE, secretKey);         String encryptedText = "Base64EncodedEncryptedText"; // 替换为实际的加密后的Base64编码字符串         byte[] encryptedBytes = Base64.getDecoder().decode(encryptedText);         byte[] decryptedBytes = cipher.doFinal(encryptedBytes);          // 输出解密后的文本         System.out.println("Decrypted text: " + new String(decryptedBytes));     } } 
  1. PKCS#8加密
import javax.crypto.Cipher; import javax.crypto.KeyGenerator; import javax.crypto.SecretKey; import javax.crypto.spec.PKCS8EncodedKeySpec; import java.security.NoSuchAlgorithmException; import java.util.Base64;  public class PKCS8Encryption {     public static void main(String[] args) throws NoSuchAlgorithmException {         // 生成RSA密钥对         KeyGenerator keyGenerator = KeyGenerator.getInstance("RSA");         keyGenerator.init(2048);         SecretKey secretKey = keyGenerator.generateKey();          // 将密钥转换为PKCS#8编码格式         PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(secretKey.getEncoded());          // 使用PKCS#8填充模式进行加密(注意:这里需要使用一个支持PKCS#8的加密算法,如AES)         Cipher cipher = Cipher.getInstance("AES");         cipher.init(Cipher.ENCRYPT_MODE, secretKey);         String plainText = "Hello, World!";         byte[] encryptedBytes = cipher.doFinal(plainText.getBytes());          // 输出加密后的Base64编码字符串         System.out.println("Encrypted text: " + Base64.getEncoder().encodeToString(encryptedBytes));     } } 
  1. PKCS#8解密
import javax.crypto.Cipher; import javax.crypto.KeyGenerator; import javax.crypto.SecretKey; import javax.crypto.spec.PKCS8EncodedKeySpec; import java.security.NoSuchAlgorithmException; import java.util.Base64;  public class PKCS8Decryption {     public static void main(String[] args) throws NoSuchAlgorithmException {         // 生成RSA密钥对         KeyGenerator keyGenerator = KeyGenerator.getInstance("RSA");         keyGenerator.init(2048);         SecretKey secretKey = keyGenerator.generateKey();          // 将密钥转换为PKCS#8编码格式         PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(secretKey.getEncoded());          // 使用

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