C#、Golang、Python、Java（Android）之间Des、Rsa加解密互通系列之Java(Android)
16lz
2021-01-23
前言
- C#、Golang、Python、Java（Android）之间Des、Rsa加解密互通系列之前言
- C#、Golang、Python、Java（Android）之间Des、Rsa加解密互通系列之C#
- C#、Golang、Python、Java（Android）之间Des、Rsa加解密互通系列之Golang
- C#、Golang、Python、Java（Android）之间Des、Rsa加解密互通系列之Python
- C#、Golang、Python、Java（Android）之间Des、Rsa加解密互通系列之Java(Android)
代码
Des对称加密工具类
package com.lht.utils;import java.security.spec.AlgorithmParameterSpec;import javax.crypto.Cipher;import javax.crypto.SecretKey;import javax.crypto.SecretKeyFactory;import javax.crypto.spec.DESKeySpec;import javax.crypto.spec.IvParameterSpec;public class DesUtils {//对称解密public static String DesDecrypt(String src,String desKey, String desIv){String decryptStr = "";try {byte[] DESkey = desKey.getBytes(); byte[] DESIV = desIv.getBytes(); DESKeySpec keySpec = new DESKeySpec(DESkey);AlgorithmParameterSpec iv = new IvParameterSpec(DESIV);// 设置向量 SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");// 获得密钥工厂 SecretKey key = keyFactory.generateSecret(keySpec);// 得到密钥对象 Cipher deCipher = Cipher.getInstance("DES/CBC/PKCS5Padding");// 得到加密对象Cipher deCipher.init(Cipher.DECRYPT_MODE, key, iv);// 设置工作模式为加密模式，给出密钥和向量 byte[] pasByte = deCipher.doFinal(Base64Utils.decode(src)); decryptStr = new String(pasByte, "UTF-8");;} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}// 设置密钥参数 return decryptStr;}//对称加密public static String DesEncrypt(String src,String desKey, String desIv){String decryptStr = "";try {byte[] DESkey = desKey.getBytes(); byte[] DESIV = desIv.getBytes(); DESKeySpec keySpec = new DESKeySpec(DESkey);AlgorithmParameterSpec iv = new IvParameterSpec(DESIV);// 设置向量 SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");// 获得密钥工厂 SecretKey key = keyFactory.generateSecret(keySpec);// 得到密钥对象 Cipher deCipher = Cipher.getInstance("DES/CBC/PKCS5Padding");// 得到加密对象Cipher deCipher.init(Cipher.ENCRYPT_MODE, key, iv);// 设置工作模式为加密模式，给出密钥和向量 byte[] pasByte = deCipher.doFinal(src.getBytes("utf-8")); decryptStr = Base64Utils.encode(pasByte) ;} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}// 设置密钥参数 return decryptStr;}}Rsa密钥对生成工具类
package com.lht.utils;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.math.BigInteger;import java.security.KeyFactory;import java.security.KeyPair;import java.security.KeyPairGenerator;import java.security.NoSuchAlgorithmException;import java.security.PrivateKey;import java.security.PublicKey;import java.security.interfaces.RSAPrivateKey;import java.security.interfaces.RSAPublicKey;import java.security.spec.InvalidKeySpecException;import java.security.spec.PKCS8EncodedKeySpec;import java.security.spec.RSAPublicKeySpec;import java.security.spec.X509EncodedKeySpec;public class RsaKeyHelper {public static final String RSA = "RSA";// 非对称加密密钥算法/** * 随机生成RSA密钥对 * * @param keyLength 密钥长度，范围：512～2048
* 一般1024 * @return */ public static KeyPair generateRSAKeyPair(int keyLength) { try { KeyPairGenerator kpg = KeyPairGenerator.getInstance(RSA); kpg.initialize(keyLength); return kpg.genKeyPair(); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); return null; } } /** * 通过公钥byte[](publicKey.getEncoded())将公钥还原，适用于RSA算法 * * @param keyBytes * @return * @throws NoSuchAlgorithmException * @throws InvalidKeySpecException */ public static PublicKey getPublicKey(byte[] keyBytes) throws NoSuchAlgorithmException, InvalidKeySpecException { X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes); KeyFactory keyFactory = KeyFactory.getInstance(RSA); PublicKey publicKey = keyFactory.generatePublic(keySpec); return publicKey; } /** * 通过私钥byte[]将公钥还原，适用于RSA算法 * * @param keyBytes * @return * @throws NoSuchAlgorithmException * @throws InvalidKeySpecException */ public static PrivateKey getPrivateKey(byte[] keyBytes) throws NoSuchAlgorithmException, InvalidKeySpecException { PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes); KeyFactory keyFactory = KeyFactory.getInstance(RSA); PrivateKey privateKey = keyFactory.generatePrivate(keySpec); return privateKey; } /** * 使用N、e值还原公钥 * * @param modulus * @param publicExponent * @return * @throws NoSuchAlgorithmException * @throws InvalidKeySpecException */ public static PublicKey getPublicKey(String modulus, String publicExponent) throws NoSuchAlgorithmException, InvalidKeySpecException { BigInteger bigIntModulus = new BigInteger(modulus); BigInteger bigIntPrivateExponent = new BigInteger(publicExponent); RSAPublicKeySpec keySpec = new RSAPublicKeySpec(bigIntModulus, bigIntPrivateExponent); KeyFactory keyFactory = KeyFactory.getInstance(RSA); PublicKey publicKey = keyFactory.generatePublic(keySpec); return publicKey; } /** * 使用N、d值还原私钥 * * @param modulus * @param privateExponent * @return * @throws NoSuchAlgorithmException * @throws InvalidKeySpecException */ public static PrivateKey getPrivateKey(String modulus, String privateExponent) throws NoSuchAlgorithmException, InvalidKeySpecException { BigInteger bigIntModulus = new BigInteger(modulus); BigInteger bigIntPrivateExponent = new BigInteger(privateExponent); RSAPublicKeySpec keySpec = new RSAPublicKeySpec(bigIntModulus, bigIntPrivateExponent); KeyFactory keyFactory = KeyFactory.getInstance(RSA); PrivateKey privateKey = keyFactory.generatePrivate(keySpec); return privateKey; } /** * 从字符串中加载公钥 * * @param publicKeyStr 公钥数据字符串 * @throws Exception 加载公钥时产生的异常 */ public static PublicKey loadPublicKey(String publicKeyStr) throws Exception { try { byte[] buffer = Base64Utils.decode(publicKeyStr); KeyFactory keyFactory = KeyFactory.getInstance(RSA); X509EncodedKeySpec keySpec = new X509EncodedKeySpec(buffer); return (RSAPublicKey) keyFactory.generatePublic(keySpec); } catch (NoSuchAlgorithmException e) { throw new Exception("无此算法"); } catch (InvalidKeySpecException e) { throw new Exception("公钥非法"); } catch (NullPointerException e) { throw new Exception("公钥数据为空"); } } /** * 从字符串中加载私钥
* 加载时使用的是PKCS8EncodedKeySpec（PKCS#8编码的Key指令）。 * * @param privateKeyStr * @return * @throws Exception */ public static PrivateKey loadPrivateKey(String privateKeyStr) throws Exception { try { byte[] buffer = Base64Utils.decode(privateKeyStr); // X509EncodedKeySpec keySpec = new X509EncodedKeySpec(buffer); PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(buffer); KeyFactory keyFactory = KeyFactory.getInstance(RSA); return (RSAPrivateKey) keyFactory.generatePrivate(keySpec); } catch (NoSuchAlgorithmException e) { throw new Exception("无此算法"); } catch (InvalidKeySpecException e) { throw new Exception("私钥非法"); } catch (NullPointerException e) { throw new Exception("私钥数据为空"); } } /** * 从文件中输入流中加载公钥 * * @param in 公钥输入流 * @throws Exception 加载公钥时产生的异常 */ public static PublicKey loadPublicKey(InputStream in) throws Exception { try { return loadPublicKey(readKey(in)); } catch (IOException e) { throw new Exception("公钥数据流读取错误"); } catch (NullPointerException e) { throw new Exception("公钥输入流为空"); } } /** * 从文件中加载私钥 * * 私钥文件名 * * @return 是否成功 * @throws Exception */ public static PrivateKey loadPrivateKey(InputStream in) throws Exception { try { return loadPrivateKey(readKey(in)); } catch (IOException e) { throw new Exception("私钥数据读取错误"); } catch (NullPointerException e) { throw new Exception("私钥输入流为空"); } } /** * 读取密钥信息 * * @param in * @return * @throws IOException */ private static String readKey(InputStream in) throws IOException { BufferedReader br = new BufferedReader(new InputStreamReader(in)); String readLine = null; StringBuilder sb = new StringBuilder(); while ((readLine = br.readLine()) != null) { if (readLine.charAt(0) == '-') { continue; } else { sb.append(readLine); sb.append('\r'); } } return sb.toString(); } /** * 打印公钥信息 * * @param publicKey */ public static void printPublicKeyInfo(PublicKey publicKey) { RSAPublicKey rsaPublicKey = (RSAPublicKey) publicKey; System.out.println("----------RSAPublicKey----------"); System.out.println("Modulus.length=" + rsaPublicKey.getModulus().bitLength()); System.out.println("Modulus=" + rsaPublicKey.getModulus().toString()); System.out.println("PublicExponent.length=" + rsaPublicKey.getPublicExponent().bitLength()); System.out.println("PublicExponent=" + rsaPublicKey.getPublicExponent().toString()); } public static void printPrivateKeyInfo(PrivateKey privateKey) { RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) privateKey; System.out.println("----------RSAPrivateKey ----------"); System.out.println("Modulus.length=" + rsaPrivateKey.getModulus().bitLength()); System.out.println("Modulus=" + rsaPrivateKey.getModulus().toString()); System.out.println("PrivateExponent.length=" + rsaPrivateKey.getPrivateExponent().bitLength()); System.out.println("PrivatecExponent=" + rsaPrivateKey.getPrivateExponent().toString()); }}
Rsa加密、解密、签名、验签工具类
package com.lht.utils;import java.security.InvalidKeyException;import java.security.NoSuchAlgorithmException;import java.security.PrivateKey;import java.security.PublicKey;import java.security.Signature;import java.security.SignatureException;import javax.crypto.Cipher;public class RsaUtils { public static final String SIGNATURE = "SHA256withRSA";//加密填充方式 public static final String ECB_PKCS1_PADDING = "RSA/ECB/PKCS1Padding";//加密填充方式 /** * 用公钥加密
* 每次加密的字节数，不能超过密钥的长度值减去11 * * @param data 需加密数据的byte数据 * 公钥 * @return 加密后的byte型数据 */ public static byte[] encryptData(byte[] data, PublicKey publicKey) { try { Cipher cipher = Cipher.getInstance(ECB_PKCS1_PADDING); // 编码前设定编码方式及密钥 cipher.init(Cipher.ENCRYPT_MODE, publicKey); // 传入编码数据并返回编码结果 return cipher.doFinal(data); } catch (Exception e) { e.printStackTrace(); return null; } } /** * 用私钥解密 * * @param encryptedData 经过encryptedData()加密返回的byte数据 * @param privateKey 私钥 * @return */ public static byte[] decryptData(byte[] encryptedData, PrivateKey privateKeyPkcs8) { try { Cipher cipher = Cipher.getInstance(ECB_PKCS1_PADDING); cipher.init(Cipher.DECRYPT_MODE, privateKeyPkcs8); return cipher.doFinal(encryptedData); } catch (Exception e) { return null; } } /** * 用私钥签名 * * @param data 需要进行签名的数据 * @param privateKey 私钥 * @return 签名数据 * @throws NoSuchAlgorithmException * @throws InvalidKeyException * @throws SignatureException */ public static byte[] Sign(byte[] data, PrivateKey privateKeyPkcs8) { try{ Signature signature = Signature.getInstance(SIGNATURE); signature.initSign(privateKeyPkcs8); signature.update(data); return signature.sign(); }catch(Exception e){ return null; } } /** * 用公钥验签 * * @param data 需要进行签名的数据 * @param publicKey 公钥 * @return */ public static boolean Verify(byte[] data, byte[] sign, PublicKey publicKey){ try{ Signature signature = Signature.getInstance(SIGNATURE); signature.initVerify(publicKey); signature.update(data); return signature.verify(sign); }catch(Exception e){ return false; } }}Base64加解密工具类
package com.lht.utils;import java.io.UnsupportedEncodingException;public class Base64Utils{ private static char[] base64EncodeChars = new char[] { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/' }; private static byte[] base64DecodeChars = new byte[] { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1 }; /** *加密 */ public static String encode(byte[] data) { StringBuffer sb = new StringBuffer(); int len = data.length; int i = 0; int b1, b2, b3; while (i < len) { b1 = data[i++] & 0xff; if (i == len) { sb.append(base64EncodeChars[b1 >>> 2]); sb.append(base64EncodeChars[(b1 & 0x3) << 4]); sb.append("=="); break; } b2 = data[i++] & 0xff; if (i == len) { sb.append(base64EncodeChars[b1 >>> 2]); sb.append(base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >>> 4)]); sb.append(base64EncodeChars[(b2 & 0x0f) << 2]); sb.append("="); break; } b3 = data[i++] & 0xff; sb.append(base64EncodeChars[b1 >>> 2]); sb.append(base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >>> 4)]); sb.append(base64EncodeChars[((b2 & 0x0f) << 2) | ((b3 & 0xc0) >>> 6)]); sb.append(base64EncodeChars[b3 & 0x3f]); } return sb.toString(); } /** * 解密 */ public static byte[] decode(String str) { try { return decodePrivate(str); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } return new byte[] {}; } private static byte[] decodePrivate(String str) throws UnsupportedEncodingException { StringBuffer sb = new StringBuffer(); byte[] data = null; data = str.getBytes("US-ASCII"); int len = data.length; int i = 0; int b1, b2, b3, b4; while (i < len) { do { b1 = base64DecodeChars[data[i++]]; } while (i < len && b1 == -1); if (b1 == -1) break; do { b2 = base64DecodeChars[data[i++]]; } while (i < len && b2 == -1); if (b2 == -1) break; sb.append((char) ((b1 << 2) | ((b2 & 0x30) >>> 4))); do { b3 = data[i++]; if (b3 == 61) return sb.toString().getBytes("iso8859-1"); b3 = base64DecodeChars[b3]; } while (i < len && b3 == -1); if (b3 == -1) break; sb.append((char) (((b2 & 0x0f) << 4) | ((b3 & 0x3c) >>> 2))); do { b4 = data[i++]; if (b4 == 61) return sb.toString().getBytes("iso8859-1"); b4 = base64DecodeChars[b4]; } while (i < len && b4 == -1); if (b4 == -1) break; sb.append((char) (((b3 & 0x03) << 6) | b4)); } return sb.toString().getBytes("iso8859-1"); }}github工程源码
https://github.com/lhtzbj12/java_android_encryption
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