C#实现WebQQ密码MD5加密算法

首先引用空间：

using System.Security.Cryptography;

WebQQ MD5加密的方式，公式是这样的：

md5(md5(hexchar2bin(md5(p)) + uin) + verify.toUpperCase());
verify是验证码，uin就是那段\x0的代码，p是密码

将普通文本转换成MD5

public static string MD5_Encrypt(string md5_str)

        {

            System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5CryptoServiceProvider.Create();

            byte[] bytes = System.Text.Encoding.ASCII.GetBytes(md5_str);

            byte[] bytes1 = md5.ComputeHash(bytes);



            System.Text.StringBuilder stringBuilder = new StringBuilder();

            foreach (var item in bytes1)

            {

                stringBuilder.Append(item.ToString("x").PadLeft(2, '0'));

            }

            return stringBuilder.ToString().ToUpper();

        }

再重载一次这个方法，以便能将字节数组也能转换成我们需要的MD5字符串

private static string MD5_Encrypt(byte[] md5_bytes)

        {

            System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5CryptoServiceProvider.Create();



            byte[] bytes1 = md5.ComputeHash(md5_bytes);

            System.Text.StringBuilder stringBuilder = new StringBuilder();

            foreach (var item in bytes1)

            {

                stringBuilder.Append(item.ToString("x").PadLeft(2, '0'));

            }

            return stringBuilder.ToString().ToUpper();



        }

接着，再上一个将字符串转换为MD5加密数组的函数

/// <summary>

        /// 获取文本的md5字节流

        /// </summary>

        /// <param name="md5_str">需要加密成Md5d的文本</param>

        /// <returns></returns>

        private static byte[] MD5_GetBytes(string md5_str)

        {

            System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5CryptoServiceProvider.Create();

            byte[] bytes = System.Text.Encoding.ASCII.GetBytes(md5_str);

            return md5.ComputeHash(bytes);

        }

接下来

/// <summary>

        /// 加密成md5字节流之后转换成文本

        /// </summary>

        /// <param name="md5_str"></param>

        /// <returns></returns>

        private static string Encrypt_1(string md5_str)

        {

            System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5CryptoServiceProvider.Create();

            byte[] bytes = System.Text.Encoding.ASCII.GetBytes(md5_str);

            bytes = md5.ComputeHash(bytes);

            System.Text.StringBuilder stringBuilder = new StringBuilder();

            foreach (var item in bytes)

            {

                stringBuilder.Append(@"\x");

                stringBuilder.Append(item.ToString("x2"));

            }

            return stringBuilder.ToString();

        }

操作字节流

public class ByteBuffer

    {

        private byte[] _buffer;

        /// <summary>

        /// 获取同后备存储区连接的基础流

        /// </summary>

        public Stream BaseStream;



        /// <summary>

        /// 构造函数

        /// </summary>

        public ByteBuffer()

        {

            this.BaseStream = new MemoryStream();

            this._buffer = new byte[0x10];

        }



        /// <summary>

        /// 设置当前流中的位置

        /// </summary>

        /// <param name="offset">相对于origin参数字节偏移量</param>

        /// <param name="origin">System.IO.SeekOrigin类型值,指示用于获取新位置的参考点</param>

        /// <returns></returns>

        public virtual long Seek(int offset, SeekOrigin origin)

        {

            return this.BaseStream.Seek((long)offset, origin);

        }







        /// <summary>

        /// 检测是否还有可用字节

        /// </summary>

        /// <returns></returns>

        public bool Peek()

        {

            return BaseStream.Position >= BaseStream.Length ? false : true;

        }



        /// <summary>

        /// 将整个流内容写入字节数组，而与 Position 属性无关。

        /// </summary>

        /// <returns></returns>

        public byte[] ToByteArray()

        {

            long org = BaseStream.Position;

            BaseStream.Position = 0;

            byte[] ret = new byte[BaseStream.Length];

            BaseStream.Read(ret, 0, ret.Length);

            BaseStream.Position = org;

            return ret;

        }





        #region "写流方法"

        /// <summary>

        /// 压入一个布尔值,并将流中当前位置提升1

        /// </summary>

        /// <param name="value"></param>

        public void Put(bool value)

        {

            this._buffer[0] = value ? (byte)1 : (byte)0;

            this.BaseStream.Write(_buffer, 0, 1);

        }



        /// <summary>

        /// 压入一个Byte,并将流中当前位置提升1

        /// </summary>

        /// <param name="value"></param>

        public void Put(Byte value)

        {

            this.BaseStream.WriteByte(value);

        }

        /// <summary>

        /// 压入Byte数组,并将流中当前位置提升数组长度

        /// </summary>

        /// <param name="value">字节数组</param>

        public void Put(Byte[] value)

        {

            if (value == null)

            {

                throw new ArgumentNullException("value");

            }

            this.BaseStream.Write(value, 0, value.Length);

        }

        /// <summary>

        /// Puts the int.

        /// </summary>

        /// <param name="value">The value.</param>

        public void PutInt(int value)

        {

            PutInt((uint)value);

        }

        /// <summary>

        /// 压入一个int,并将流中当前位置提升4

        /// </summary>

        /// <param name="value"></param>

        public void PutInt(uint value)

        {

            this._buffer[0] = (byte)(value >> 0x18);

            this._buffer[1] = (byte)(value >> 0x10);

            this._buffer[2] = (byte)(value >> 8);

            this._buffer[3] = (byte)value;

            this.BaseStream.Write(this._buffer, 0, 4);

        }

        /// <summary>

        /// Puts the int.

        /// </summary>

        /// <param name="index">The index.</param>

        /// <param name="value">The value.</param>

        public void PutInt(int index, uint value)

        {

            int pos = (int)this.BaseStream.Position;

            Seek(index, SeekOrigin.Begin);

            PutInt(value);

            Seek(pos, SeekOrigin.Begin);

        }



        #endregion



        #region "读流方法"



        /// <summary>

        /// 读取Byte值,并将流中当前位置提升1

        /// </summary>

        /// <returns></returns>

        public byte Get()

        {

            return (byte)BaseStream.ReadByte();

        }



        #endregion


    }

最后一个函数

public static string MD5_QQ_2_Encrypt(long uin, string password, string verifyCode)

        {



            ByteBuffer buffer= new ByteBuffer();

             buffer.Put(MD5_GetBytes(password));

            //buffer.Put(Encoding.UTF8.GetBytes(password));

            buffer.PutInt(0);

            buffer.PutInt((uint)uin);

            byte[] bytes = buffer.ToByteArray();

            string md5_1 = MD5_Encrypt(bytes);//将混合后的字节流进行一次md5加密

            string result= MD5_Encrypt(md5_1 + verifyCode.ToUpper());//再用加密后的结果与大写的验证码一起加密一次

            return result;



        }