轉載請註明出處: http://blog.csdn.net/bbld_/article/details/38777491
概述
RSA是目前最有影響力的公鑰加密算法,該算法基於一個十分簡單的數論事實:將兩個大素數相乘十分容易,但那時想要對其乘積進行因式分解卻極其困 難,因此可以將乘積公開作爲加密密鑰,即公鑰,而兩個大素數組合成私鑰。公鑰是可發佈的供任何人使用,私鑰則爲自己所有,供解密之用。關於RSA其它需要了解的知識,參考維基百科:http://zh.wikipedia.org/zh-cn/RSA%E5%8A%A0%E5%AF%86%E6%BC%94%E7%AE%97%E6%B3%95
在項目開發中對於一些比較敏感的信息需要對其進行加密處理,我們就可以使用RSA這種非對稱加密算法來對數據進行加密處理。
使用
祕鑰對的生成
1、我們可以在代碼裏隨機生成密鑰對
- /**
- * 隨機生成RSA密鑰對
- *
- * @param keyLength
- * 密鑰長度,範圍: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;
- }
- }
通過這方法我們得到KeyPair後就可以調用 keyPair.getPrivate() 和 pair.getPublic()得到 私鑰 和 公鑰了。不過實際我們一般是使用2的方法把生成的密鑰對保存起來,密鑰自己保存,比如服務端,把公鑰給客戶端(Android)用於加密需要發送的數據,最後服務端根據私鑰吧客戶端加密的信息解密再處理。
2、通過OpenSSl工具生成密鑰對
OpenSSl工具下載:OpenSSl工具 (64位的也可使用)使用OpenSSl工具生成密鑰對的過程如下:
首先雙擊打開bin文件夾下的openssl.exe,打開之後是一個命令行窗口:
然後通過如下命令生成私鑰:
- genrsa -out rsa_private_key.pem 1024
用文本類工具打開可看到裏面的內容:
- -----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-----
這裏面的內容是標準的ASCII字符,中間的一大串字符就是私鑰數據了。
然後通過如下命令生成公鑰:
- rsa -in rsa_private_key.pem -out rsa_public_key.pem -pubout
打開文件看下里面的內容:
- -----BEGIN PUBLIC KEY-----
- MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCfRTdcPIH10gT9f31rQuIInLwe
- 7fl2dtEJ93gTmjE9c2H+kLVENWgECiJVQ5sonQNfwToMKdO0b3Olf4pgBKeLThra
- z/L3nYJYlbqjHC3jTjUnZc0luumpXGsox62+PuSGBlfb8zJO6hix4GV/vhyQVCpG
- 9aYqgE7zyTRZYX9byQIDAQAB
- -----END PUBLIC KEY-----
可以看到是跟私鑰的文件類似的。
這樣密鑰就基本生成了,不過這樣密鑰對的私鑰是無法在代碼中直接使用的,要想使用它需要藉助RSAPrivateKeyStructure這個類,java是不自帶的。所以爲了方便使用,我們需要對私鑰進行PKCS#8編碼,命令如下:
- pkcs8 -topk8 -in rsa_private_key.pem -out pkcs8_rsa_private_key.pem -nocrypt
這條命令的結果依然是在bin文件夾生成了pkcs8_rsa_private_key.pem文件,打開內容如下:
- -----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-----
可以看到中間的私鑰內容有所變化了,這樣的私鑰我們在代碼裏就方便使用了。
以上的密鑰文件使用時需要注意吧頭和尾的字符串去掉,我們只取中間的內容。
代碼中的使用
首先我們需要封裝寫個RSA的工具類,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";
- /**
- * 隨機生成RSA密鑰對(默認密鑰長度爲1024)
- *
- * @return
- */
- public static KeyPair generateRSAKeyPair()
- {
- return generateRSAKeyPair(1024);
- }
- /**
- * 隨機生成RSA密鑰對
- *
- * @param keyLength
- * 密鑰長度,範圍: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;
- }
- }
- /**
- * 用公鑰加密 <br>
- * 每次加密的字節數,不能超過密鑰的長度值減去11
- *
- * @param data
- * 需加密數據的byte數據
- * @param pubKey
- * 公鑰
- * @return 加密後的byte型數據
- */
- public static byte[] encryptData(byte[] data, PublicKey publicKey)
- {
- try
- {
- Cipher cipher = Cipher.getInstance(RSA);
- // 編碼前設定編碼方式及密鑰
- cipher.init(Cipher.ENCRYPT_MODE, publicKey);
- // 傳入編碼數據並返回編碼結果
- return cipher.doFinal(data);
- } catch (Exception e)
- {
- e.printStackTrace();
- return null;
- }
- }
- /**
- * 用私鑰解密
- *
- * @param encryptedData
- * 經過encryptedData()加密返回的byte數據
- * @param privateKey
- * 私鑰
- * @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;
- }
- }
- /**
- * 通過公鑰byte[](publicKey.getEncoded())將公鑰還原,適用於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;
- }
- /**
- * 通過私鑰byte[]將公鑰還原,適用於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值還原公鑰
- *
- * @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值還原私鑰
- *
- * @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;
- }
- /**
- * 從字符串中加載公鑰
- *
- * @param publicKeyStr
- * 公鑰數據字符串
- * @throws Exception
- * 加載公鑰時產生的異常
- */
- 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("無此算法");
- } catch (InvalidKeySpecException e)
- {
- throw new Exception("公鑰非法");
- } catch (NullPointerException e)
- {
- throw new Exception("公鑰數據爲空");
- }
- }
- /**
- * 從字符串中加載私鑰<br>
- * 加載時使用的是PKCS8EncodedKeySpec(PKCS#8編碼的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("無此算法");
- } catch (InvalidKeySpecException e)
- {
- throw new Exception("私鑰非法");
- } catch (NullPointerException e)
- {
- throw new Exception("私鑰數據爲空");
- }
- }
- /**
- * 從文件中輸入流中加載公鑰
- *
- * @param in
- * 公鑰輸入流
- * @throws Exception
- * 加載公鑰時產生的異常
- */
- public static PublicKey loadPublicKey(InputStream in) throws Exception
- {
- try
- {
- return loadPublicKey(readKey(in));
- } catch (IOException e)
- {
- throw new Exception("公鑰數據流讀取錯誤");
- } catch (NullPointerException e)
- {
- throw new Exception("公鑰輸入流爲空");
- }
- }
- /**
- * 從文件中加載私鑰
- *
- * @param keyFileName
- * 私鑰文件名
- * @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("私鑰數據讀取錯誤");
- } catch (NullPointerException e)
- {
- throw new Exception("私鑰輸入流爲空");
- }
- }
- /**
- * 讀取密鑰信息
- *
- * @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();
- }
- /**
- * 打印公鑰信息
- *
- * @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長度限制的,過長的話會拋異常!!!
代碼中有些需要使用Base64再轉換的,而java中不自帶,Android中自帶,所以自己寫出一個來,方便Java後臺使用
- 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 = 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");
- }
- }
最後就是真正使用它們了:
- 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;// 需加密的內容,加密後的內容,解密後的內容
- /* 密鑰內容 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
- {
- // 從字符串中得到公鑰
- // PublicKey publicKey = RSAUtils.loadPublicKey(PUCLIC_KEY);
- // 從文件中得到公鑰
- InputStream inPublic = getResources().getAssets().open("rsa_public_key.pem");
- PublicKey publicKey = RSAUtils.loadPublicKey(inPublic);
- // 加密
- byte[] encryptByte = RSAUtils.encryptData(source.getBytes(), publicKey);
- // 爲了方便觀察吧加密後的數據用base64加密轉一下,要不然看起來是亂碼,所以解密是也是要用Base64先轉換
- 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
- {
- // 從字符串中得到私鑰
- // PrivateKey privateKey = RSAUtils.loadPrivateKey(PRIVATE_KEY);
- // 從文件中得到私鑰
- InputStream inPrivate = getResources().getAssets().open("pkcs8_rsa_private_key.pem");
- PrivateKey privateKey = RSAUtils.loadPrivateKey(inPrivate);
- // 因爲RSA加密後的內容經Base64再加密轉換了一下,所以先Base64解密回來再給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;
- }
- }
- }
我把密鑰放到assest資源文件夾裏了,也可以直接使用字符串得到,上面註釋掉了。
最後我們來看下效果吧:
源碼下載地址:http://download.csdn.net/detail/bbld_/7806673