Android客戶端中怎么實(shí)現(xiàn)RSA加密功能，很多新手對(duì)此不是很清楚，為了幫助大家解決這個(gè)難題，下面小編將為大家詳細(xì)講解，有這方面需求的人可以來學(xué)習(xí)下，希望你能有所收獲。
建網(wǎng)站原本是網(wǎng)站策劃師、網(wǎng)絡(luò)程序員、網(wǎng)頁設(shè)計(jì)師等，應(yīng)用各種網(wǎng)絡(luò)程序開發(fā)技術(shù)和網(wǎng)頁設(shè)計(jì)技術(shù)配合操作的協(xié)同工作。創(chuàng)新互聯(lián)專業(yè)提供成都做網(wǎng)站、成都網(wǎng)站建設(shè),網(wǎng)頁設(shè)計(jì),網(wǎng)站制作(企業(yè)站、自適應(yīng)網(wǎng)站建設(shè)、電商門戶網(wǎng)站)等服務(wù),從網(wǎng)站深度策劃、搜索引擎友好度優(yōu)化到用戶體驗(yàn)的提升,我們力求做到極致!
Android 客戶端RSA加密的實(shí)現(xiàn)方法
針對(duì)java后端進(jìn)行的RSA加密，android客戶端進(jìn)行解密，結(jié)果是部分亂碼的問題：
注意兩點(diǎn)，編碼問題和客戶端使用的算法問題
即：都使用UTF-8編碼，Base64使用一致，另外，使用下面的代碼在后端和移動(dòng)端解密只有一點(diǎn)不同：
移動(dòng)端使用
Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");后端使用
Cipher cipher = Cipher.getInstance("RSA");其他地方都不需要改動(dòng)
package rsa;
import android.util.Base64;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
//import org.apache.commons.codec.binary.Base64;
/** *//**
*
* BASE64編碼解碼工具包
*
* @author IceWee
* @date 2012-5-19
* @version 1.0
*/
public class Base64Utils {
/** *//**
* 文件讀取緩沖區(qū)大小
*/
private static final int CACHE_SIZE = 1024;
/** *//**
*
* BASE64字符串解碼為二進(jìn)制數(shù)據(jù)
*
*
* @param base64
* @return
* @throws Exception
*/
public static byte[] decode(String base64) throws Exception {
return Base64.decode(base64.getBytes(), Base64.DEFAULT);
}
/** *//**
*
* 二進(jìn)制數(shù)據(jù)編碼為BASE64字符串
*
*
* @param bytes
* @return
* @throws Exception
*/
public static String encode(byte[] bytes) throws Exception {
return new String(Base64.encode(bytes, Base64.DEFAULT));
}
/**
*
* @param str
* @return
* @throws Exception
*/
public static String encode(String str) throws Exception {
byte[] bytes = str.getBytes("utf-8");
return encode(bytes);
}
/** *//**
*
* 將文件編碼為BASE64字符串
*
*
* 大文件慎用，可能會(huì)導(dǎo)致內(nèi)存溢出
*
*
* @param filePath 文件絕對(duì)路徑
* @return
* @throws Exception
*/
public static String encodeFile(String filePath) throws Exception {
byte[] bytes = fileToByte(filePath);
return encode(bytes);
}
/** *//**
*
* BASE64字符串轉(zhuǎn)回文件
*
*
* @param filePath 文件絕對(duì)路徑
* @param base64 編碼字符串
* @throws Exception
*/
public static void decodeToFile(String filePath, String base64) throws Exception {
byte[] bytes = decode(base64);
byteArrayToFile(bytes, filePath);
}
/** *//**
*
* 文件轉(zhuǎn)換為二進(jìn)制數(shù)組
*
*
* @param filePath 文件路徑
* @return
* @throws Exception
*/
public static byte[] fileToByte(String filePath) throws Exception {
byte[] data = new byte[0];
File file = new File(filePath);
if (file.exists()) {
FileInputStream in = new FileInputStream(file);
ByteArrayOutputStream out = new ByteArrayOutputStream(2048);
byte[] cache = new byte[CACHE_SIZE];
int nRead = 0;
while ((nRead = in.read(cache)) != -1) {
out.write(cache, 0, nRead);
out.flush();
}
out.close();
in.close();
data = out.toByteArray();
}
return data;
}
/** *//**
*
* 二進(jìn)制數(shù)據(jù)寫文件
*
*
* @param bytes 二進(jìn)制數(shù)據(jù)
* @param filePath 文件生成目錄
*/
public static void byteArrayToFile(byte[] bytes, String filePath) throws Exception {
InputStream in = new ByteArrayInputStream(bytes);
File destFile = new File(filePath);
if (!destFile.getParentFile().exists()) {
destFile.getParentFile().mkdirs();
}
destFile.createNewFile();
OutputStream out = new FileOutputStream(destFile);
byte[] cache = new byte[CACHE_SIZE];
int nRead = 0;
while ((nRead = in.read(cache)) != -1) {
out.write(cache, 0, nRead);
out.flush();
}
out.close();
in.close();
}
}
package rsa;
import android.util.Base64;
import java.io.ByteArrayOutputStream;
import java.security.Key;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.HashMap;
import java.util.Map;
import javax.crypto.Cipher;
/**
*
* RSA公鑰/私鑰/簽名工具包
*
*
* 羅納德·李維斯特（Ron [R]ivest）、阿迪·薩莫爾（Adi [S]hamir）和倫納德·阿德曼（Leonard [A]dleman）
*
*
* 字符串格式的密鑰在未在特殊說明情況下都為BASE64編碼格式
* 由于非對(duì)稱加密速度極其緩慢，一般文件不使用它來加密而是使用對(duì)稱加密，
* 非對(duì)稱加密算法可以用來對(duì)對(duì)稱加密的密鑰加密，這樣保證密鑰的安全也就保證了數(shù)據(jù)的安全
*
*
* @author IceWee
* @date 2012-4-26
* @version 1.0
*/
public class RSAUtils {
/**
* 加密算法RSA
*/
public static final String KEY_ALGORITHM = "RSA";
/**
* 簽名算法
*/
public static final String SIGNATURE_ALGORITHM = "MD5withRSA";
/**
* 獲取公鑰的key
*/
private static final String PUBLIC_KEY = "RSAPublicKey";
/**
* 獲取私鑰的key
*/
private static final String PRIVATE_KEY = "RSAPrivateKey";
/**
* RSA最大加密明文大小
*/
private static final int MAX_ENCRYPT_BLOCK = 117;
/**
* RSA最大解密密文大小
*/
private static final int MAX_DECRYPT_BLOCK = 128;
/**
*
* 生成密鑰對(duì)(公鑰和私鑰)
*
*
* @return
* @throws Exception
*/
public static Map genKeyPair() throws Exception {
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);
keyPairGen.initialize(1024);
KeyPair keyPair = keyPairGen.generateKeyPair();
RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
Map keyMap = new HashMap(2);
keyMap.put(PUBLIC_KEY, publicKey);
keyMap.put(PRIVATE_KEY, privateKey);
return keyMap;
}
/**
*
* 用私鑰對(duì)信息生成數(shù)字簽名
*
*
* @param data 已加密數(shù)據(jù)
* @param privateKey 私鑰(BASE64編碼)
*
* @return
* @throws Exception
*/
public static String sign(byte[] data, String privateKey) throws Exception {
byte[] keyBytes = Base64.decode(privateKey,0);
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
PrivateKey privateK = keyFactory.generatePrivate(pkcs8KeySpec);
Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
signature.initSign(privateK);
signature.update(data);
return Base64.encodeToString(signature.sign(), 0);
}
/**
*
* 校驗(yàn)數(shù)字簽名
*
*
* @param data 已加密數(shù)據(jù)
* @param publicKey 公鑰(BASE64編碼)
* @param sign 數(shù)字簽名
*
* @return
* @throws Exception
*
*/
public static boolean verify(byte[] data, String publicKey, String sign)
throws Exception {
byte[] keyBytes = Base64.decode(publicKey,0);
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
PublicKey publicK = keyFactory.generatePublic(keySpec);
Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
signature.initVerify(publicK);
signature.update(data);
return signature.verify(Base64.decode(sign,0));
}
/**
*
* 私鑰解密
*
*
* @param encryptedData 已加密數(shù)據(jù)
* @param privateKey 私鑰(BASE64編碼)
* @return
* @throws Exception
*/
public static byte[] decryptByPrivateKey(byte[] encryptedData, String privateKey)
throws Exception {
byte[] keyBytes = Base64.decode(privateKey, 0);
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
cipher.init(Cipher.DECRYPT_MODE, privateK);
int inputLen = encryptedData.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0;
// 對(duì)數(shù)據(jù)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;
}
/**
*
* 公鑰解密
*
*
* @param encryptedData 已加密數(shù)據(jù)
* @param publicKey 公鑰(BASE64編碼)
* @return
* @throws Exception
*/
public static byte[] decryptByPublicKey(byte[] encryptedData, String publicKey)
throws Exception {
byte[] keyBytes = Base64.decode(publicKey,0);
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key publicK = keyFactory.generatePublic(x509KeySpec);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, publicK);
int inputLen = encryptedData.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0;
// 對(duì)數(shù)據(jù)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;
}
/**
*
* 公鑰加密
*
*
* @param data 源數(shù)據(jù)
* @param publicKey 公鑰(BASE64編碼)
* @return
* @throws Exception
*/
public static byte[] encryptByPublicKey(byte[] data, String publicKey)
throws Exception {
byte[] keyBytes = Base64.decode(publicKey,0);
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key publicK = keyFactory.generatePublic(x509KeySpec);
// 對(duì)數(shù)據(jù)加密
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.ENCRYPT_MODE, publicK);
int inputLen = data.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0;
// 對(duì)數(shù)據(jù)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[] encryptedData = out.toByteArray();
out.close();
return encryptedData;
}
/**
*
* 私鑰加密
*
*
* @param data 源數(shù)據(jù)
* @param privateKey 私鑰(BASE64編碼)
* @return
* @throws Exception
*/
public static byte[] encryptByPrivateKey(byte[] data, String privateKey)
throws Exception {
byte[] keyBytes = Base64.decode(privateKey,0);
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.ENCRYPT_MODE, privateK);
int inputLen = data.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0;
// 對(duì)數(shù)據(jù)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[] encryptedData = out.toByteArray();
out.close();
return encryptedData;
}
/**
*
* 獲取私鑰
*
*
* @param keyMap 密鑰對(duì)
* @return
* @throws Exception
*/
public static String getPrivateKey(Map keyMap)
throws Exception {
Key key = (Key) keyMap.get(PRIVATE_KEY);
return Base64.encodeToString(key.getEncoded(),0);
}
/**
*
* 獲取公鑰
*
*
* @param keyMap 密鑰對(duì)
* @return
* @throws Exception
*/
public static String getPublicKey(Map keyMap)
throws Exception {
Key key = (Key) keyMap.get(PUBLIC_KEY);
return Base64.encodeToString(key.getEncoded(), 0);
}
}
看完上述內(nèi)容是否對(duì)您有幫助呢？如果還想對(duì)相關(guān)知識(shí)有進(jìn)一步的了解或閱讀更多相關(guān)文章，請(qǐng)關(guān)注創(chuàng)新互聯(lián)行業(yè)資訊頻道，感謝您對(duì)創(chuàng)新互聯(lián)的支持。
當(dāng)前文章：Android客戶端中怎么實(shí)現(xiàn)RSA加密功能
文章路徑：
http://weahome.cn/article/pisosp.html
重慶分公司
重慶分公司
