android RSA 私钥加密 公钥解密[不支持分段,单次长度约128位]

AppRsaUtil.java

public class AppRsaUtil {

    static String pub = "";

    static String pri = "";

    //公钥解密
    public static String decodePub(String code){
        try {
            byte[] codeBytes = Base64.decode(code, Base64.DEFAULT);
            byte[] pubBytes = Base64.decode(pub, Base64.DEFAULT);
            RSAPublicKey pubKey = (RSAPublicKey) KeyFactory.getInstance("RSA").generatePublic(new X509EncodedKeySpec(pubBytes));
            //解密
            Cipher cipher = Cipher.getInstance("RSA");
            cipher.init(Cipher.DECRYPT_MODE, pubKey);
            String outStr = new String(cipher.doFinal(codeBytes));
            return outStr;
        } catch (Exception e) {
            return "";
        }
    }

    /**
     * 私钥加密
     * @param str 待加密字符串
     */
    public static String encryptPri(String str){
        try {
            byte[] inputByte = str.getBytes("UTF-8");
            //base64编码的私钥
            byte[] decoded = Base64.decode(pri, Base64.DEFAULT);
            RSAPrivateKey priKey = (RSAPrivateKey) KeyFactory.getInstance("RSA").generatePrivate(new PKCS8EncodedKeySpec(decoded));
            //加密
            Cipher cipher = Cipher.getInstance("RSA");
            cipher.init(Cipher.ENCRYPT_MODE, priKey);

            String outStr = Base64.encodeToString(cipher.doFinal(inputByte), Base64.DEFAULT);
            return outStr;
        }catch (Exception e){
            return "";
        }
    }
}