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Android RSA加密解密
转载请注明出处: http://blog.csdn.net/bbld_/article/details/38777491
概述
RSA是目前最有影响力的公钥加密算法,该算法基于一个十分简单的数论事实:将两个大素数相乘十分容易,但那时想要对其乘积进行因式分解却极其困 难,因此可以将乘积公开作为加密密钥,即公钥,而两个大素数组合成私钥。公钥是可发布的供任何人使用,私钥则为自己所有,供解密之用。关于RSA其它需要了解的知识,参考维基百科:http://zh.wikipedia.org/zh-cn/RSA%E5%8A%A0%E5%AF%86%E6%BC%94%E7%AE%97%E6%B3%95
在项目开发中对于一些比较敏感的信息需要对其进行加密处理,我们就可以使用RSA这种非对称加密算法来对数据进行加密处理。
使用
秘钥对的生成
1、我们可以在代码里随机生成密钥对
/** * 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; } }
通过这方法我们得到KeyPair后就可以调用 keyPair.getPrivate() 和 pair.getPublic()得到 私钥 和 公钥了。不过实际我们一般是使用2的方法把生成的密钥对保存起来,密钥自己保存,比如服务端,把公钥给客户端(Android)用于加密需要发送的数据,最后服务端根据私钥吧客户端加密的信息解密再处理。
2、通过OpenSSl工具生成密钥对
OpenSSl工具下载:OpenSSl工具 (64位的也可使用)使用OpenSSl工具生成密钥对的过程如下:
首先双击打开bin文件夹下的openssl.exe,打开之后是一个命令行窗口:
然后通过如下命令生成私钥:
genrsa -out rsa_private_key.pem 1024
用文本类工具打开可看到里面的内容:
-----BEGIN RSA PRIVATE KEY----- MIICXQIBAAKBgQCfRTdcPIH10gT9f31rQuIInLwe7fl2dtEJ93gTmjE9c2H+kLVE NWgECiJVQ5sonQNfwToMKdO0b3Olf4pgBKeLThraz/L3nYJYlbqjHC3jTjUnZc0l uumpXGsox62+PuSGBlfb8zJO6hix4GV/vhyQVCpG9aYqgE7zyTRZYX9byQIDAQAB AoGAO9+sYRtKC9xJDfcocfMxv+UT/1ic6EDgcqu6Uzwq+Jvwod9KlXqyQJqCr6T7 pjfodc3RAZOTx4gCZJverBvz053RH5GawCdocEgaqbXAAWJOhA+9IEU0NUud7ckF yDko0QXLoGP9tanrMEt5zMqt8QxDyl6Xcij3mk8rivOgBJECQQDNTO6dZX8xCozc Ne0gzC53Gv/KQXANBBHMr7WkKUb2i5+tXkEJ5z3abx2ppEQXDr4AgJH8Gtbm6K7t EHV4ov4FAkEAxppD/iiT1/SVQq20be8CsiHpsjTPiestWQWdm1Qn/Y2nAkGkpCFp yEdUvVDPtQhRN9EqNggNAnwg5kMvsuwN9QJAfHBhQe4/hk5Kyz+0l+irUW6AFOxN KtaIo3TtuK98X/yJsOAstAACMeCgLi9vRjqdWFiWJCVwlU38mZ0cVx8UsQJBALzt M5Er+LiPKw5rQCD0JZRfPnkQU/3XgyQUe4Gv5PsHLcCvwXeBcafcc3hEz9JfPyPi Dk2oCvg6LPHfKBkFBaECQQCODcKX6DBWiyVxmPaJOOcF63KpCYDPkjeovIUHro1x ElR2GrQCC/9Q4C4vruOhBQ+vX8NMPnO6NBy5TLGDwMyc -----END RSA PRIVATE KEY-----
这里面的内容是标准的ASCII字符,中间的一大串字符就是私钥数据了。
然后通过如下命令生成公钥:
rsa -in rsa_private_key.pem -out rsa_public_key.pem -pubout
打开文件看下里面的内容:
-----BEGIN PUBLIC KEY----- MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCfRTdcPIH10gT9f31rQuIInLwe 7fl2dtEJ93gTmjE9c2H+kLVENWgECiJVQ5sonQNfwToMKdO0b3Olf4pgBKeLThra z/L3nYJYlbqjHC3jTjUnZc0luumpXGsox62+PuSGBlfb8zJO6hix4GV/vhyQVCpG 9aYqgE7zyTRZYX9byQIDAQAB -----END PUBLIC KEY-----
可以看到是跟私钥的文件类似的。
这样密钥就基本生成了,不过这样密钥对的私钥是无法在代码中直接使用的,要想使用它需要借助RSAPrivateKeyStructure这个类,java是不自带的。所以为了方便使用,我们需要对私钥进行PKCS#8编码,命令如下:
pkcs8 -topk8 -in rsa_private_key.pem -out pkcs8_rsa_private_key.pem -nocrypt
这条命令的结果依然是在bin文件夹生成了pkcs8_rsa_private_key.pem文件,打开内容如下:
-----BEGIN PRIVATE KEY----- MIICdwIBADANBgkqhkiG9w0BAQEFAASCAmEwggJdAgEAAoGBAJ9FN1w8gfXSBP1/ fWtC4gicvB7t+XZ20Qn3eBOaMT1zYf6QtUQ1aAQKIlVDmyidA1/BOgwp07Rvc6V/ imAEp4tOGtrP8vedgliVuqMcLeNONSdlzSW66alcayjHrb4+5IYGV9vzMk7qGLHg ZX++HJBUKkb1piqATvPJNFlhf1vJAgMBAAECgYA736xhG0oL3EkN9yhx8zG/5RP/ WJzoQOByq7pTPCr4m/Ch30qVerJAmoKvpPumN+h1zdEBk5PHiAJkm96sG/PTndEf kZrAJ2hwSBqptcABYk6ED70gRTQ1S53tyQXIOSjRBcugY/21qeswS3nMyq3xDEPK XpdyKPeaTyuK86AEkQJBAM1M7p1lfzEKjNw17SDMLnca/8pBcA0EEcyvtaQpRvaL n61eQQnnPdpvHamkRBcOvgCAkfwa1uboru0QdXii/gUCQQDGmkP+KJPX9JVCrbRt 7wKyIemyNM+J6y1ZBZ2bVCf9jacCQaSkIWnIR1S9UM+1CFE30So2CA0CfCDmQy+y 7A31AkB8cGFB7j+GTkrLP7SX6KtRboAU7E0q1oijdO24r3xf/Imw4Cy0AAIx4KAu L29GOp1YWJYkJXCVTfyZnRxXHxSxAkEAvO0zkSv4uI8rDmtAIPQllF8+eRBT/deD JBR7ga/k+wctwK/Bd4Fxp9xzeETP0l8/I+IOTagK+Dos8d8oGQUFoQJBAI4Nwpfo MFaLJXGY9ok45wXrcqkJgM+SN6i8hQeujXESVHYatAIL/1DgLi+u46EFD69fw0w+ c7o0HLlMsYPAzJw= -----END PRIVATE KEY-----
可以看到中间的私钥内容有所变化了,这样的私钥我们在代码里就方便使用了。
以上的密钥文件使用时需要注意吧头和尾的字符串去掉,我们只取中间的内容。
代码中的使用
首先我们需要封装写个RSA的工具类,方便加密解密的操作。
package com.example.rsa; 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; import javax.crypto.Cipher; /** * @author Mr.Zheng * @date 2014年8月22日 下午1:44:23 */ public final class RSAUtils { private static String RSA = "RSA"; /** * 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); // 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); 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 = 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<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 = 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 * * @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()); } }
上面需要注意的就是加密是有长度限制的,过长的话会抛异常!!!
代码中有些需要使用Base64再转换的,而java中不自带,Android中自带,所以自己写出一个来,方便Java后台使用
package com.example.rsa; import java.io.UnsupportedEncodingException; /** * @author Mr.Zheng * @date 2014年8月22日 下午9:50:28 */ 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 * * @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 = http://www.mamicode.com/null;>
最后就是真正使用它们了:package com.example.rsa; import java.io.InputStream; import java.security.PrivateKey; import java.security.PublicKey; import android.app.Activity; import android.os.Bundle; import android.util.Base64; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; public class MainActivity extends Activity implements OnClickListener { private Button btn1, btn2;// 加密,解密 private EditText et1, et2, et3;// 需加密的内容,加密后的内容,解密后的内容 /* 密钥内容 base64 code */ private static String PUCLIC_KEY = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCfRTdcPIH10gT9f31rQuIInLwe" + "\r" + "7fl2dtEJ93gTmjE9c2H+kLVENWgECiJVQ5sonQNfwToMKdO0b3Olf4pgBKeLThra" + "\r" + "z/L3nYJYlbqjHC3jTjUnZc0luumpXGsox62+PuSGBlfb8zJO6hix4GV/vhyQVCpG" + "\r" + "9aYqgE7zyTRZYX9byQIDAQAB" + "\r"; private static String PRIVATE_KEY = "MIICdwIBADANBgkqhkiG9w0BAQEFAASCAmEwggJdAgEAAoGBAJ9FN1w8gfXSBP1/" + "\r" + "fWtC4gicvB7t+XZ20Qn3eBOaMT1zYf6QtUQ1aAQKIlVDmyidA1/BOgwp07Rvc6V/" + "\r" + "imAEp4tOGtrP8vedgliVuqMcLeNONSdlzSW66alcayjHrb4+5IYGV9vzMk7qGLHg" + "\r" + "ZX++HJBUKkb1piqATvPJNFlhf1vJAgMBAAECgYA736xhG0oL3EkN9yhx8zG/5RP/" + "\r" + "WJzoQOByq7pTPCr4m/Ch30qVerJAmoKvpPumN+h1zdEBk5PHiAJkm96sG/PTndEf" + "\r" + "kZrAJ2hwSBqptcABYk6ED70gRTQ1S53tyQXIOSjRBcugY/21qeswS3nMyq3xDEPK" + "\r" + "XpdyKPeaTyuK86AEkQJBAM1M7p1lfzEKjNw17SDMLnca/8pBcA0EEcyvtaQpRvaL" + "\r" + "n61eQQnnPdpvHamkRBcOvgCAkfwa1uboru0QdXii/gUCQQDGmkP+KJPX9JVCrbRt" + "\r" + "7wKyIemyNM+J6y1ZBZ2bVCf9jacCQaSkIWnIR1S9UM+1CFE30So2CA0CfCDmQy+y" + "\r" + "7A31AkB8cGFB7j+GTkrLP7SX6KtRboAU7E0q1oijdO24r3xf/Imw4Cy0AAIx4KAu" + "\r" + "L29GOp1YWJYkJXCVTfyZnRxXHxSxAkEAvO0zkSv4uI8rDmtAIPQllF8+eRBT/deD" + "\r" + "JBR7ga/k+wctwK/Bd4Fxp9xzeETP0l8/I+IOTagK+Dos8d8oGQUFoQJBAI4Nwpfo" + "\r" + "MFaLJXGY9ok45wXrcqkJgM+SN6i8hQeujXESVHYatAIL/1DgLi+u46EFD69fw0w+" + "\r" + "c7o0HLlMsYPAzJw=" + "\r"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); } private void initView() { btn1 = (Button) findViewById(R.id.btn1); btn2 = (Button) findViewById(R.id.btn2); btn1.setOnClickListener(this); btn2.setOnClickListener(this); et1 = (EditText) findViewById(R.id.et1); et2 = (EditText) findViewById(R.id.et2); et3 = (EditText) findViewById(R.id.et3); } @Override public void onClick(View v) { switch (v.getId()) { // 加密 case R.id.btn1: String source = et1.getText().toString().trim(); 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(source.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 String afterencrypt = Base64Utils.encode(encryptByte); et2.setText(afterencrypt); } catch (Exception e) { e.printStackTrace(); } break; // 解密 case R.id.btn2: String encryptContent = et2.getText().toString().trim(); 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(Base64Utils.decode(encryptContent), privateKey); String decryptStr = new String(decryptByte); et3.setText(decryptStr); } catch (Exception e) { e.printStackTrace(); } break; default: break; } } }
我把密钥放到assest资源文件夹里了,也可以直接使用字符串得到,上面注释掉了。最后我们来看下效果吧:
源码下载地址:http://download.csdn.net/detail/bbld_/7806673
Android RSA加密解密