Android实现公共公钥加密私钥解密（可分段加密分段解密）

公私钥在线生成在线生成公钥私钥

public class MainActivity extends AppCompatActivity {@BindView(R.id.tv_name)TextView tvName;//公钥和私钥的格式不能变，否则会影响加密解密，直接粘贴复制不可自己改动private static String PUCLIC_KEY = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC7SzXRRsqP3HBOvyunB9V45cVV\n" +"uuAMoRuYfSpi2VQAuB26D789fjntjjMjofByKU2S9idELLpzuyHge31Oa7GjLZ98\n" +"La3PA8DtouOfuKaq9eBtZOgd/ZTevVQoJQ4WTdJTVlry5MI1PihJSqDA+Y8Wfdwm\n" +"hfMFQcBbmKgp1GqGQwIDAQABAA";private static String PRIVATE_KEY = "MIICdgIBADANBgkqhkiG9w0BAQEFAASCAmAwggJcAgEAAoGBALtLNdFGyo/ccE6/\n" +"K6cH1XjlxVW64AyhG5h9KmLZVAC4HboPvz1+Oe2OMyOh8HIpTZL2J0QsunO7IeB7\n" +"fU5rsaMtn3wtrc8DwO2i45+4pqr14G1k6B39lN69VCglDhZN0lNWWvLkwjU+KElK\n" +"oMD5jxZ93CaF8wVBwFuYqCnUaoZDAgMBAAECgYBhLApGA+aAcSxLjt/FD0lwKjYR\n" +"3pzzsHqyyO2+z2bH4L57lEPyUZUYbRiXOiOX91nqD5AbzOEHvmU7JJbEoxdL3/by\n" +"aNzen32irrw9X4XDQ4cxPFv1ya449TJGbnzHF7Rc4RHtMQ8ZgthxOaBaW8YhZkaP\n" +"S4BfaiFAGHtZISGv4QJBAO9p++m3z2kMJOwozOT8ZkTe28Y+f5uuCmnmJrDTI3R9\n" +"5XuctYgH0rr0mhC3+W+fMl8/svazalst6uifsIG+QzsCQQDIRN9T4fH1iKIDGMEP\n" +"a+hQ+mz1AsaPSUX80n13KE9gV+cyErZ3Pi7CP/THPwvmoUt9QCZERwlsEhmE7Slo\n" +"J4iZAkBPGr+ni5o2ZVLVzO1WQ6cu3kvThtb3A1xhfTAPgNPYK7jlTPQWDC+uoh89AA\n" +"ouwB26HzIsLpDIL5uYRCdHEHjWv9AkAWIua8kuD3zt55kSbl2XuYV9XrTx87f1Hp\n" +"HCsaHK6Ja632bvMUQx9QAVnBHErodzOs6IZSTbfQ5j9D3iMRjC0hAkEAvJdM4lHU\n" +"I2HJC4/WRhuQCGd2yTi0jCJqmwAogtxJVjDw1hs5D72CBb6phZ7E/RH1tNOL0clA\n" +"GG0UVY2IOT4YtQ==";private String mAfterencrypt;private JSONObject mJsonObject;private String mS;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);ButterKnife.bind(this);mS = "hahhahhahah";tvName.setText(mS);}@OnClick({R.id.button1, R.id.button2})public void onViewClicked(View view) {switch (view.getId()) {case R.id.button1:try {// 从字符串中得到公钥PublicKey publicKey = RSAUtils.loadPublicKey(PUCLIC_KEY);// 从文件中得到公钥
//                    InputStream inPublic = getResources().getAssets().open("rsa_public_key.pem");
//                    PublicKey publicKey = RSAUtils.loadPublicKey(inPublic);// 加密byte[] encryptByte = RSAUtils.encryptData(mS.getBytes(), publicKey);// 为了方便观察吧加密后的数据用base64加密转一下，要不然看起来是乱码,所以解密是也是要用Base64先转换mAfterencrypt = Base64Util.encode(encryptByte);tvName.setText(mAfterencrypt);System.out.println("加密前：" + mS);System.out.println("加密后：" + mAfterencrypt);} catch (Exception e) {e.printStackTrace();}break;case R.id.button2:try {// 从字符串中得到私钥PrivateKey privateKey = RSAUtils.loadPrivateKey(PRIVATE_KEY);// 从文件中得到私钥
//                    InputStream inPrivate = getResources().getAssets().open("pkcs8_rsa_private_key.pem");
//                    PrivateKey privateKey = RSAUtils.loadPrivateKey(inPrivate);// 因为RSA加密后的内容经Base64再加密转换了一下，所以先Base64解密回来再给RSA解密byte[] decryptByte = RSAUtils.decryptData(Base64Util.decode(mAfterencrypt), privateKey);String decryptStr = new String(decryptByte);Log.d("RSA", "解密后的数据：" + decryptStr);tvName.setText(decryptStr);} catch (Exception e) {e.printStackTrace();}break;default:}}
}

RSA工具类

/*** date:2020/9/4 0004* author:wsm (Administrator)* funcation:*/public class RSAUtils {private static String RSA = "RSA";/*** *** RSA最大加密大小*/private final static int MAX_ENCRYPT_BLOCK = 117;/*** *** RSA最大解密大小*/private final static int MAX_DECRYPT_BLOCK = 128;/*** 随机生成RSA密钥对(默认密钥长度为1024)** @return*/public static KeyPair generateRSAKeyPair() {return generateRSAKeyPair(1024);}/*** 随机生成RSA密钥对** @param keyLength 密钥长度，范围：512～2048<br>*                  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;}}/*** 用公钥加密 <br>* 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* @param pubKey 公钥* @return 加密后的byte型数据*/public static byte[] encryptData(byte[] data, PublicKey publicKey) {try {Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");// 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 privateKey) {try {Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");cipher.init(Cipher.DECRYPT_MODE, privateKey);return cipher.doFinal(encryptedData);} catch (Exception e) {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 = Base64Util.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<br>* 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 = Base64Util.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");}}/*** 用公钥分段加密 <br>* 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* @param publicKey 公钥* @return 加密后的byte型数据*/public static byte[] PublicSubData(byte[] data, PublicKey publicKey) {try {Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");// 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);int inputLen = data.length;ByteArrayOutputStream out = new ByteArrayOutputStream();int offSet = 0;byte[] cache;int i = 0;// 对数据分段加密while (inputLen - offSet > 0){if (inputLen - offSet > MAX_ENCRYPT_BLOCK){cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);} else{cache = cipher.doFinal(data, offSet, inputLen - offSet);}out.write(cache, 0, cache.length);i++;offSet = i * MAX_ENCRYPT_BLOCK;}byte[] decryptedData = out.toByteArray();out.close();return decryptedData;} catch (Exception e) {e.printStackTrace();return null;}}/*** 用私钥分段解密** @param encryptedData 经过encryptedData()加密返回的byte数据* @param privateKey    私钥* @return*/public static byte[] PrivateSubData(byte[] encryptedData, PrivateKey privateKey) {try {Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");cipher.init(Cipher.DECRYPT_MODE, privateKey);
//            return cipher.doFinal(encryptedData);// 返回UTF-8编码的解密信息int inputLen = encryptedData.length;ByteArrayOutputStream out = new ByteArrayOutputStream();int offSet = 0;byte[] cache;int i = 0;// 对数据分段解密while (inputLen - offSet > 0){if (inputLen - offSet > MAX_DECRYPT_BLOCK){cache = cipher.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);} else{cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet);}out.write(cache, 0, cache.length);i++;offSet = i * MAX_DECRYPT_BLOCK;}byte[] decryptedData = out.toByteArray();out.close();return decryptedData;} catch (Exception e) {return null;}}/*** 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** @param keyFileName 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());}
}

Base64

/*** date:2020/9/4 0004* author:wsm (Administrator)* funcation:*/
public final class Base64Util {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** @param data* @return*/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** @param str* @return*/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");}
}

demo下载地址链接：
链接：https://pan.baidu.com/s/1eJubvnLkG4qzkwlKCjsRBg
提取码：jryi

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