Android(安卓)RSA公钥加密
16lz
2021-01-26
参考：http://www.bkjia.com/Androidjc/868958.html
利用OpenSSL工具生成密钥对，参考以上文章时利用公钥加密后的，后台始终无法解密（不知道哪错了，还是不用自定义的Base64吧）。
最后使用以下方法加密成功：
RSAUtil.encryptByPublic(Context context, String content)import java.io.BufferedReader;import java.io.InputStreamReader;import java.security.KeyFactory;import java.security.NoSuchAlgorithmException;import java.security.PublicKey;import java.security.spec.X509EncodedKeySpec;import javax.crypto.Cipher;import android.content.Context;import android.util.Base64;/** * RSA加密工具 * * @author Administrator * */public class RSAUtil{public static final String RSA_PUBLIC = "";/** * 得到公钥 * * @param algorithm * @param bysKey * @return * @throws NoSuchAlgorithmException * @throws Exception */private static PublicKey getPublicKeyFromX509(String algorithm,String bysKey) throws NoSuchAlgorithmException, Exception{byte[] decodeKey = Base64.decode(bysKey, Base64.DEFAULT);X509EncodedKeySpec x509 = new X509EncodedKeySpec(decodeKey);KeyFactory keyFactory = KeyFactory.getInstance(algorithm);return keyFactory.generatePublic(x509);}/** * 使用公钥加密 * * @param content * @return */public static String encryptByPublic(Context context, String content){try{String pubKey = getPublicKeyFromAssets(context);PublicKey publicKey = getPublicKeyFromX509(ALGORITHM, pubKey);Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");cipher.init(Cipher.ENCRYPT_MODE, publicKey);byte[] plaintext = content.getBytes();byte[] output = cipher.doFinal(plaintext);String str = Base64.encodeToString(output, Base64.DEFAULT);return str;} catch (Exception e){e.printStackTrace();return null;}}/** * 获取公钥 * * @param fileName * @return */private static String getPublicKeyFromAssets(Context context){try{InputStreamReader inputReader = new InputStreamReader(context.getResources().getAssets().open("public_key.pem"));BufferedReader bufReader = new BufferedReader(inputReader);String line = "";String Result = "";while ((line = bufReader.readLine()) != null){if (line.charAt(0) == '-'){continue;}Result += line;}return Result;} catch (Exception e){e.printStackTrace();return null;}}}
android、ios客户端rsa加密秘钥生成 http://sparrow82.iteye.com/blog/1834859
1、openssl生成公司钥对openssl req -x509 -out public_key.der -outform der -new -newkey rsa:1024 -keyout private_key.pem
生成私钥：private_key.pem
公钥：public_key.der
2、将private_key.pem转换成PKCS8Padding格式
openssl pkcs8 -topk8 -inform PEM -in private_key.pem -outform PEM -nocrypt
返回一串字符如：
-----BEGIN PRIVATE KEY-----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-----END PRIVATE KEY-----
取出-----BEGIN PRIVATE KEY-----和-----END PRIVATE KEY-----之间的字符保存，做为解密的私钥串。
3、将生成的公钥DER文件BASE64编码
openssl base64 -in public_key.der
生成的字符串做为IOS的公钥
4、从已有的私钥中，导出android使用的公钥
openssl rsa -in private_key.pem -pubout -out rsa_public_key.pem
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