RSA加密和解密

Question

密钥文件：公钥public.key，私钥private.key
如何用这个两个文件进行RSA加密和解密，谢谢，麻烦给一下代码。

Answer 1

using System;
using System.Security.Cryptography;
using System.Text;namespace xfqz86Helper
{
    public static class RSA
    {
        /// <summary>   
        /// RAS加密   
        /// </summary>   
        /// <param name="xmlPublicKey">公钥</param>   
        /// <param name="EncryptString">明文</param>   
        /// <returns>密文</returns>   
        public static string RSAEncrypt(string xmlPublicKey, string EncryptString)
        {
            byte[] PlainTextBArray;
            byte[] CypherTextBArray;
            string Result = String.Empty;
            System.Security.Cryptography.RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
            rsa.FromXmlString(xmlPublicKey);
            int t = (int)(Math.Ceiling((double)EncryptString.Length / (double)50));
            for (int i = 0; i <= t - 1; i++)
            {                PlainTextBArray = (new UnicodeEncoding()).GetBytes(EncryptString.Substring(i * 50, EncryptString.Length - (i * 50) > 50 ? 50 : EncryptString.Length - (i * 50)));
                CypherTextBArray = rsa.Encrypt(PlainTextBArray, false);
                Result += Convert.ToBase64String(CypherTextBArray) + "ThisIsSplit";
            }
            return Result;
        }
        /// <summary>   
        /// RAS解密   
        /// </summary>   
        /// <param name="xmlPrivateKey">私钥</param>   
        /// <param name="DecryptString">密文</param>   
        /// <returns>明文</returns>   
        public static string RSADecrypt(string xmlPrivateKey, string DecryptString)
        {
            byte[] PlainTextBArray;
            byte[] DypherTextBArray;
            string Result = String.Empty;
            System.Security.Cryptography.RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
            rsa.FromXmlString(xmlPrivateKey);
            string[] Split = new string[1];
            Split[0] = "ThisIsSplit";
            string[] mis = DecryptString.Split(Split, StringSplitOptions.RemoveEmptyEntries);
            for (int i = 0; i < mis.Length; i++)
            {
                PlainTextBArray = Convert.FromBase64String(mis[i]);
                DypherTextBArray = rsa.Decrypt(PlainTextBArray, false);
                Result += (new UnicodeEncoding()).GetString(DypherTextBArray);
            }
            return Result;
        }
        /// <summary>   
        /// 产生公钥和私钥对   
        /// </summary>   
        /// <returns>string[] 0:私钥;1:公钥</returns>   
        public static string[] RSAKey()
        {
            string[] keys = new string[2];
            System.Security.Cryptography.RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
            keys[0] = rsa.ToXmlString(true);
            keys[1] = rsa.ToXmlString(false);
            return keys;
        }
    }
}

Answer 2

先谢谢，我的公钥和私钥是对方给我的.key文件，要用这两个文件进行加密和解密

Answer 3

把你的公钥Key文件内容发上来看看。一般Key文件里面直接是密钥字串。

Answer 4

MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDfoS5mMkl6oyT1CKaEaNVSmJTg
s1AOjOvGJ7P3Qnje3/hsWI3ROX0imxuzng82rpRthnyQwAbAAu3DXj2xPyxz1Dmv
t7nYM+gQX+YY+cVMvBAodDdFSZwwnTFbGBazvXIHaakFKZHYUWdUuYbYpbZKbqrt
/uscOoKPChsLFOlNkQIDAQAB

Answer 5

上面就是key文件里的公钥，怎么用它来加密和解密呢？一楼的xmlPublicKey是不是需要XML类型的？

Answer 6

啊哦 微软有例子的 自己去msdn上看吧
http://msdn.microsoft.com/en-us/library/system.security.cryptography.rsacryptoserviceprovider.aspxhttp://blog.csdn.net/heqichanggg/article/details/4043243

Answer 7

例子里的key是随机生成的吧？我已经有key了

Answer 8

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用这个加密的时候，提示 无效的密钥集参数，怎么解决呢

Answer 9

详细参考
http://blog.csdn.net/llwinnner/article/details/4011936