工具类-RSA非对称加密工具类，自用留存_免费自用加密软件资源-CSDN文库

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RSA是一种广泛应用于网络通信中的非对称加密算法，它的全称是Rivest-Shamir-Adleman，由三位美国数学家Rivest、Shamir和Adleman在1977年提出。非对称加密与对称加密不同，它使用一对密钥，一把是公开的公钥，另一把是私有的私钥。这种机制使得信息的发送方可以使用接收方的公钥来加密数据，只有持有对应私钥的接收方才能解密，从而保证了数据的安全性。在Java中，我们可以使用Java Cryptography Extension (JCE)库来实现RSA加密。`EncrypRSA.java`这个文件很可能是一个包含了RSA加密功能的Java工具类，通常这样的类会包含以下核心方法： 1. **生成密钥对**：使用`KeyPairGenerator`类的`generateKeyPair()`方法，指定`"RSA"`作为加密算法，设置密钥长度（如1024位、2048位等）。 ```java KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA"); keyGen.initialize(2048); KeyPair keyPair = keyGen.generateKeyPair(); PublicKey publicKey = keyPair.getPublic(); PrivateKey privateKey = keyPair.getPrivate(); ``` 2. **加密操作**：使用`Cipher`类进行加密，首先通过`getInstance()`方法获取一个加密/解密对象，然后使用`init()`方法初始化，传入加密模式（`Cipher.ENCRYPT_MODE`）和公钥。 ```java Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.ENCRYPT_MODE, publicKey); byte[] encryptedBytes = cipher.doFinal(plaintext.getBytes()); ``` 3. **解密操作**：解密过程类似，只是使用私钥和`Cipher.DECRYPT_MODE`。 ```java cipher.init(Cipher.DECRYPT_MODE, privateKey); byte[] decryptedBytes = cipher.doFinal(encryptedBytes); String decryptedText = new String(decryptedBytes); ``` 4. **密钥的保存和加载**：为了长期存储密钥，我们通常会将公钥和私钥转换成Base64编码的字符串，然后写入文件或数据库。加载时再反向操作，解码后再转换回密钥对象。 ```java String publicKeyString = Base64.getEncoder().encodeToString(publicKey.getEncoded()); String privateKeyString = Base64.getEncoder().encodeToString(privateKey.getEncoded()); // 保存到文件或数据库 // ... // 加载 byte[] publicKeyBytes = Base64.getDecoder().decode(publicKeyString); byte[] privateKeyBytes = Base64.getDecoder().decode(privateKeyString); PublicKey loadedPublicKey = KeyFactory.getInstance("RSA").generatePublic(new X509EncodedKeySpec(publicKeyBytes)); PrivateKey loadedPrivateKey = KeyFactory.getInstance("RSA").generatePrivate(new PKCS8EncodedKeySpec(privateKeyBytes)); ``` 5. **安全注意事项**：RSA加密不适合对大量数据进行直接加密，因为其效率较低。通常我们会先使用RSA加密一个随机生成的对称密钥，然后用这个对称密钥去加密大量数据。这样既能利用非对称加密的安全性，又兼顾了对称加密的高效性。以上就是RSA非对称加密在Java中的基本使用，`EncrypRSA.java`这个工具类很可能就实现了这些功能。在实际应用中，还应注意密钥的管理和保护，避免密钥泄露导致的安全风险。同时，Java的JCE也有安全强度的限制，如果需要超过默认限制的密钥长度，可能需要安装不受限的JCE政策文件。

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EncrypRSA.rar （1个子文件）

EncrypRSA.java 14KB

package com.breakfastapi.util; import org.bouncycastle.asn1.ASN1Encodable; import org.bouncycastle.asn1.ASN1Primitive; import org.bouncycastle.asn1.pkcs.PrivateKeyInfo; import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo; import org.springframework.util.Base64Utils; import javax.crypto.Cipher; import java.security.*; import java.security.interfaces.RSAPrivateKey; import java.security.interfaces.RSAPublicKey; import java.security.spec.InvalidKeySpecException; import java.security.spec.PKCS8EncodedKeySpec; import java.security.spec.X509EncodedKeySpec; import java.util.Base64; import java.util.HashMap; import java.util.Map; import java.util.UUID; public class EncrypRSA { /** * 算法名称 */ private static final String ALGORITHM = "RSA"; /** * 默认密钥大小 */ private static final int KEY_SIZE = 4096; /** * 密钥对生成器 */ private static KeyPairGenerator keyPairGenerator = null; private static KeyFactory keyFactory = null; /** * 缓存的密钥对 */ private static KeyPair keyPair = null; /** * Base64 编码/解码器 JDK1.8 */ private static Base64.Decoder decoder = Base64.getDecoder(); private static Base64.Encoder encoder = Base64.getEncoder(); public static final String PEM_CODE_PUB = "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"; public static final String PEM_CODE_PRI = "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"; /** 初始化密钥工厂 */ static { try { keyPairGenerator = KeyPairGenerator.getInstance(ALGORITHM); keyFactory = KeyFactory.getInstance(ALGORITHM); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } } private EncrypRSA() { } public static synchronized Map<String, Object> generateKeyPair() { try { keyPairGenerator.initialize(KEY_SIZE, new SecureRandom(UUID.randomUUID().toString().replaceAll("-", "").getBytes())); keyPair = keyPairGenerator.generateKeyPair(); } catch (Exception e) { e.printStackTrace(); } RSAPublicKey rsaPublicKey = (RSAPublicKey) keyPair.getPublic(); RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) keyPair.getPrivate(); String publicKeyString = encoder.encodeToString(rsaPublicKey.getEncoded()); String privateKeyString = encoder.encodeToString(rsaPrivateKey.getEncoded()); Map<String, Object> keyPairMap = new HashMap<String, Object>(); keyPairMap.put("public", publicKeyString); keyPairMap.put("private", privateKeyString); System.out.println(publicKeyString); System.out.println(privateKeyString); return keyPairMap; } public static synchronized Map<String, Object> generatePKS1KeyPair() { Map<String, Object> keyPairMap = new HashMap<String, Object>(); try { keyPairGenerator.initialize(KEY_SIZE, new SecureRandom(UUID.randomUUID().toString().replaceAll("-", "").getBytes())); keyPair = keyPairGenerator.generateKeyPair(); PublicKey pub = keyPair.getPublic(); byte[] pubBytes = pub.getEncoded(); SubjectPublicKeyInfo spkInfo = SubjectPublicKeyInfo.getInstance(pubBytes); ASN1Primitive pubprimitive = spkInfo.parsePublicKey(); byte[] publicKeyPKCS1 = pubprimitive.getEncoded(); System.out.println(publicKeyPKCS1.toString()); PrivateKey priv = keyPair.getPrivate(); byte[] privBytes = priv.getEncoded(); PrivateKeyInfo pkInfo = PrivateKeyInfo.getInstance(privBytes); ASN1Encodable encodable = pkInfo.parsePrivateKey(); ASN1Primitive priprimitive = encodable.toASN1Primitive(); byte[] privateKeyPKCS1 = priprimitive.getEncoded(); System.out.println(privateKeyPKCS1.toString()); keyPairMap.put("public", publicKeyPKCS1); keyPairMap.put("private", privateKeyPKCS1.toString()); } catch (Exception e) {

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