使用反射和Attribute动态显示代码中的注释内容
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反射和Attribute是.NET的两种技术，可以应用在很多的地方。
反射可以反射类中的属性，方法，实现动态调用，也经常在三层工厂中使用，反射接口的实现。
Attribute，个人理解，就是一个特性，可以添加在任何自定义类型上面，然后添加一些注释，也是很有用的。
本篇就示例讲解一个他们的结合使用：使用反射和Attribute动态显示代码中的注释内容。其中也杂合它一些其他的内容，一个是前几天写的一个C#的加密解密算法，包括Silverlight的MD5算法。还有就是一个商品规格的计算方法，比如给出需要购买的总量，然后计算每种规格需要购买的数量，和总的花费。
结果如下图
代码如下
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web.Security;
using System.Reflection;
namespace ConsoleApplication1
{
[AttributeUsage(AttributeTargets.Class)]
class CodeReviewAttribute : System.Attribute
{
private string _reviewer;
public string Reviewer
{
get { return _reviewer; }
}
private string _date;
public string Date
{
get { return _date; }
}
private string _comment;
public string Comment
{
get { return _comment; }
set { _comment = value; }
}
public CodeReviewAttribute(string reviewer, string date)
{
this._reviewer = reviewer;
this._date = date;
}
}
[CodeReview("swb", "2009-9-9", Comment = "代码不好")]
class MyClass
{
}
[AttributeUsage(AttributeTargets.Enum | AttributeTargets.Field)]
class NoteAttribute : System.Attribute
{
private string _name;
public string Name
{
get { return _name; }
}
public NoteAttribute(string name)
{
this._name = name;
}
}
enum Log
{
[Note("添加 用户")]
AddUser,
[Note("修改 用户")]
ModifyUser
}
class EnumDescription
{
public static string Parse(Log type)
{
FieldInfo fields = type.GetType().GetField(type.ToString());
object[] objs = fields.GetCustomAttributes(true);
return ((NoteAttribute)objs[0]).Name;
}
}
public interface IChinese
{
string Speak();
}
public class CNSpeaker : IChinese
{
#region Chinese Members
public string Speak()
{
return "Chinese";
}
#endregion
}
public interface IEnglish
{
string Speak();
}
public class ENSpeaker : IEnglish
{
#region English Members
string IEnglish.Speak()
{
return "English";
}
#endregion
}
class Program
{
static void Main(string[] args)
{
CNSpeaker cn = new CNSpeaker();
Console.WriteLine(cn.Speak());
IEnglish en = new ENSpeaker();
Console.WriteLine(en.Speak());
Console.WriteLine("---------------------");
string str = "123";
Console.WriteLine(string.Format("123 encrypt result: {0}", WebMD5Provider.WebFormMD5Encrypt(str)));
Console.WriteLine("---------------------");
MD5CryptoServiceProvider md5Provider = new MD5CryptoServiceProvider();
byte[] encryptedBytes = md5Provider.ComputeHash(Encoding.UTF8.GetBytes(str));
StringBuilder sb = new StringBuilder();
for (int i = 0; i < encryptedBytes.Length; i++)
{
sb.AppendFormat("{0:x2}", encryptedBytes[i]);
}
Console.WriteLine(string.Format("123 encrypt result: {0}", sb.ToString()));
Console.WriteLine("---------------------");
System.Reflection.MemberInfo info = typeof(MyClass);
CodeReviewAttribute att = (CodeReviewAttribute)Attribute.GetCustomAttribute(info, typeof(CodeReviewAttribute));
if (att != null)
{
Console.WriteLine("MyClass 代码监察人：{0}", att.Reviewer);
Console.WriteLine("MyClass 检查时间：{0}", att.Date);
Console.WriteLine("MyClass 备注：{0}", att.Comment);
}
Console.WriteLine("---------------------");
Log log = Log.AddUser;
Console.WriteLine(string.Format ("Enum Log 的 AddUser 的注释是: {0}",EnumDescription.Parse(log)));
Console.WriteLine("---------------------");
Int64? bbb = 0;
int? aaa = 0;
Console.WriteLine("---------------------");
decimal area = 110;
Console.WriteLine("你的土地面积是：{0}", area);
decimal amount = 10m;
Console.WriteLine("你的每亩用量是是：{0}", amount );
decimal budget = 0;
List<pkgspec> pkgs = new List<pkgspec>();
pkgs.Add(new pkgspec() { amount = 200, price = 180, id = 2 });
pkgs.Add(new pkgspec() { amount = 100, price = 100, id = 1 });
pkgs.Add(new pkgspec() { amount = 250, price = 250, id = 3 });
pkgs.Sort(new Comparison<pkgspec>(compareDesc));
// pkgs.Sort(new Comparison<pkgspec>(compareAsc));
decimal totalAmount = area * amount;
Console.WriteLine("你的总共用量是：{0}", totalAmount);
int num = 0;
List<pkgselect> select = new List<pkgselect>();
foreach (pkgspec pkg in pkgs)
{
if (totalAmount % pkg.amount == totalAmount)
{
num =1;
budget += num * pkg.price;
select.Add(new pkgselect() { id = pkg.id, num = num, price=pkg.price });
break;
}
else if (totalAmount % pkg.amount == 0)
{
num = (int)(totalAmount / pkg.amount);
budget += num * pkg.price;
select.Add(new pkgselect() { id = pkg.id, num = (int)(totalAmount / pkg.amount) , price=pkg.price });
break;
}
else
{
num = (int)(totalAmount / pkg.amount);
budget += num * pkg.price;
select.Add(new pkgselect() { id = pkg.id, num = num , price=pkg.price });
totalAmount = totalAmount - num * pkg.amount;
continue;
}
}
foreach (pkgselect s in select)
{
Console.WriteLine("你需要购买的包装编号是：{0}, 数量是 {1} 个 ， 单价是 {2}", s.id, s.num, s.price);
}
Console.WriteLine("你购买的总价是: {0}", budget);
Console.ReadLine();
}
private static int compareAsc(pkgspec pkg1, pkgspec pkg2)
{
if (pkg1.amount > pkg2.amount)
return 1;
if (pkg1.amount < pkg2.amount)
return -1;
else
return 0;
}
private static int compareDesc(pkgspec pkg1, pkgspec pkg2)
{
if (pkg1.amount < pkg2.amount)
return 1;
if (pkg1.amount > pkg2.amount)
return -1;
else
return 0;
}
}
/// <summary>
/// 选中的包装
/// </summary>
class pkgselect
{
/// <summary>
/// 选中ID
/// </summary>
public int id;
/// <summary>
/// 购买数量
/// </summary>
public int num;
/// <summary>
/// 单价
/// </summary>
public decimal price;
}
/// <summary>
/// 包装类型
/// </summary>
class pkgspec : IComparable<pkgspec>
{
/// <summary>
/// 编号
/// </summary>
public int id;
/// <summary>
/// 包装量
/// </summary>
public decimal amount;
/// <summary>
/// 价格
/// </summary>
public decimal price;
#region IComparable<pkgspec> Members
public int CompareTo(pkgspec other)
{
if (this.amount > other.amount)
return 1;
if (this.amount == other.amount)
return 0;
else
return -1;
}
#endregion
}
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web.Security;
using System.Security.Cryptography;
using System.IO;
namespace ConsoleApplication1
{
/// <summary>
/// 字符串加解密工具类
/// </summary>
public static class EncryptUtility
{
#region WinForm 的MD5和SHA1哈希，使得和System.Web.Security.FormsAuthentication的结果一致
public static string WinFormMD5Encrypt(string data)
{
MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
byte[] encryptedBytes = md5.ComputeHash(Encoding.ASCII.GetBytes(data));
StringBuilder sb = new StringBuilder();
for (int i = 0; i < encryptedBytes.Length; i++)
{
sb.AppendFormat("{0:x2}", encryptedBytes[i]);
}
return sb.ToString().ToUpper();
}
public static string WinFormSHA1Encrypt(string data)
{
SHA1CryptoServiceProvider md5 = new SHA1CryptoServiceProvider();
byte[] encryptedBytes = md5.ComputeHash(Encoding.ASCII.GetBytes(data));
StringBuilder sb = new StringBuilder();
for (int i = 0; i < encryptedBytes.Length; i++)
{
sb.AppendFormat("{0:x2}", encryptedBytes[i]);
}
return sb.ToString().ToUpper();
}
#endregion
#region WebForm中的 MD5 和 SHA1 哈希
/// <summary>
/// 返回MD5哈希结果
/// </summary>
/// <param name="password"></param>
/// <returns></returns>
public static string WebFormMD5Encrypt(string data)
{
if (string.IsNullOrEmpty(data))
throw new Exception("加密字符串不能为空");
return FormsAuthentication.HashPasswordForStoringInConfigFile(data, "md5");
}
/// <summary>
/// 返回SHA1哈希结果
/// </summary>
/// <param name="password"></param>
/// <returns></returns>
public static string WebFormSHA1Encrypt(string data)
{
if (string.IsNullOrEmpty(data))
throw new Exception("加密字符串不能为空");
return FormsAuthentication.HashPasswordForStoringInConfigFile(data, "sha1");
}
#endregion
#region 普通的字符变换加解密
/// <summary>
/// 普通字符还变
/// 加密
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public static string CommonEncrypt(string data)
{
if (string.IsNullOrEmpty(data))
throw new Exception("加密字符串不能为空");
string result = string.Empty;
int len = data.Length;
for (int i = 0; i < len; i++)
{
result += (char)(data[i] + 10 - 1 * 2);
}
return result;
}
/// <summary>
/// 普通的字符变换
/// 解密
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public static string CommonDecrypt(string data)
{
if (string.IsNullOrEmpty(data))
throw new Exception("加密字符串不能为空");
string result = string.Empty;
int len = data.Length;
for (int i = 0; i < len; i++)
{
result += (char)(data[i] - 10 + 1 * 2);
}
return result;
}
#endregion
#region 带有密钥的加解密
private static readonly string KEY_64 = System.Configuration.ConfigurationManager.AppSettings["key_64"];
/// <summary>
/// 带有密钥的加解密
/// 加密
/// </summary>
/// <param name="data"></param>
/// <returns></returns>
public static string KeyEncrypt(string data)
{
using (DESCryptoServiceProvider provider = new DESCryptoServiceProvider())
{
byte[] inputByteArray = Encoding.UTF8.GetBytes(data);
provider.Key = ASCIIEncoding.ASCII.GetBytes(KEY_64.Substring(0, 8));
provider.IV = ASCIIEncoding.ASCII.GetBytes(KEY_64);
MemoryStream ms = new MemoryStream();
using (CryptoStream cs = new CryptoStream(ms, provider.CreateEncryptor(), CryptoStreamMode.Write))
{
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
cs.Close();
}
string str = Convert.ToBase64String(ms.ToArray());
ms.Close();
return str;
}
}
/// <summary>
/// 带有密钥的加解密
/// 解密
/// </summary>
/// <param name="data"></param>
/// <returns></returns>
public static string KeyDecrypt(string data)
{
byte[] inputByteArray = Convert.FromBase64String(data);
using (DESCryptoServiceProvider provider = new DESCryptoServiceProvider())
{
provider.Key = ASCIIEncoding.ASCII.GetBytes(KEY_64.Substring(0, 8));
provider.IV = ASCIIEncoding.ASCII.GetBytes(KEY_64);
MemoryStream ms = new MemoryStream();
using (CryptoStream cs = new CryptoStream(ms, provider.CreateDecryptor(), CryptoStreamMode.Write))
{
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
cs.Close();
}
string str = Encoding.UTF8.GetString(ms.ToArray());
ms.Close();
return str;
}
}
#endregion
}
public class WebMD5Provider
{
#region WebForm中的 MD5 和 SHA1 哈希
/// <summary>
/// 返回MD5哈希结果
/// </summary>
/// <param name="password"></param>
/// <returns></returns>
public static string WebFormMD5Encrypt(string data)
{
if (string.IsNullOrEmpty(data))
throw new Exception("加密字符串不能为空");
return FormsAuthentication.HashPasswordForStoringInConfigFile(data, "md5");
}
/// <summary>
/// 返回SHA1哈希结果
/// </summary>
/// <param name="password"></param>
/// <returns></returns>
public static string WebFormSHA1Encrypt(string data)
{
if (string.IsNullOrEmpty(data))
throw new Exception("加密字符串不能为空");
return FormsAuthentication.HashPasswordForStoringInConfigFile(data, "sha1");
}
#endregion
}
public class MD5CryptoServiceProvider : MD5
{
public MD5CryptoServiceProvider()
: base()
{
}
}
/// <summary>
/// Summary description for MD5.
/// </summary>
public class MD5 : IDisposable
{
static public MD5 Create(string hashName)
{
if (hashName == "MD5")
return new MD5();
else
throw new NotSupportedException();
}
static public String GetMd5String(String source)
{
MD5 md = MD5CryptoServiceProvider.Create();
byte[] hash;
//Create a new instance of ASCIIEncoding to
//convert the string into an array of Unicode bytes.
UTF8Encoding enc = new UTF8Encoding();
// ASCIIEncoding enc = new ASCIIEncoding();
//Convert the string into an array of bytes.
byte[] buffer = enc.GetBytes(source);
//Create the hash value from the array of bytes.
hash = md.ComputeHash(buffer);
StringBuilder sb = new StringBuilder();
foreach (byte b in hash)
sb.Append(b.ToString("x2"));
return sb.ToString();
}
static public MD5 Create()
{
return new MD5();
}
#region base implementation of the MD5
#region constants
private const byte S11 = 7;
private const byte S12 = 12;
private const byte S13 = 17;
private const byte S14 = 22;
private const byte S21 = 5;
private const byte S22 = 9;
private const byte S23 = 14;
private const byte S24 = 20;
private const byte S31 = 4;
private const byte S32 = 11;
private const byte S33 = 16;
private const byte S34 = 23;
private const byte S41 = 6;
private const byte S42 = 10;
private const byte S43 = 15;
private const byte S44 = 21;
static private byte[] PADDING = new byte[] {
0x80, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
#endregion
#region F, G, H and I are basic MD5 functions.
static private uint F(uint x, uint y, uint z)
{
return (((x) & (y)) | ((~x) & (z)));
}
static private uint G(uint x, uint y, uint z)
{
return (((x) & (z)) | ((y) & (~z)));
}
static private uint H(uint x, uint y, uint z)
{
return ((x) ^ (y) ^ (z));
}
static private uint I(uint x, uint y, uint z)
{
return ((y) ^ ((x) | (~z)));
}
#endregion
#region rotates x left n bits.
/// <summary>
/// rotates x left n bits.
/// </summary>
/// <param name="x"></param>
/// <param name="n"></param>
/// <returns></returns>
static private uint ROTATE_LEFT(uint x, byte n)
{
return (((x) << (n)) | ((x) >> (32 - (n))));
}
#endregion
#region FF, GG, HH, and II transformations
/// FF, GG, HH, and II transformations
/// for rounds 1, 2, 3, and 4.
/// Rotation is separate from addition to prevent recomputation.
static private void FF(ref uint a, uint b, uint c, uint d, uint x, byte s, uint ac)
{
(a) += F((b), (c), (d)) + (x) + (uint)(ac);
(a) = ROTATE_LEFT((a), (s));
(a) += (b);
}
static private void GG(ref uint a, uint b, uint c, uint d, uint x, byte s, uint ac)
{
(a) += G((b), (c), (d)) + (x) + (uint)(ac);
(a) = ROTATE_LEFT((a), (s));
(a) += (b);
}
static private void HH(ref uint a, uint b, uint c, uint d, uint x, byte s, uint ac)
{
(a) += H((b), (c), (d)) + (x) + (uint)(ac);
(a) = ROTATE_LEFT((a), (s));
(a) += (b);
}
static private void II(ref uint a, uint b, uint c, uint d, uint x, byte s, uint ac)
{
(a) += I((b), (c), (d)) + (x) + (uint)(ac);
(a) = ROTATE_LEFT((a), (s));
(a) += (b);
}
#endregion
#region context info
/// <summary>
/// state (ABCD)
/// </summary>
uint[] state = new uint[4];
/// <summary>
/// number of bits, modulo 2^64 (lsb first)
/// </summary>
uint[] count = new uint[2];
/// <summary>
/// input buffer
/// </summary>
byte[] buffer = new byte[64];
#endregion
internal MD5()
{
Initialize();
}
/// <summary>
/// MD5 initialization. Begins an MD5 operation, writing a new context.
/// </summary>
/// <remarks>
/// The RFC named it "MD5Init"
/// </remarks>
public virtual void Initialize()
{
count[0] = count[1] = 0;
// Load magic initialization constants.
state[0] = 0x67452301;
state[1] = 0xefcdab89;
state[2] = 0x98badcfe;
state[3] = 0x10325476;
}
/// <summary>
/// MD5 block update operation. Continues an MD5 message-digest
/// operation, processing another message block, and updating the
/// context.
/// </summary>
/// <param name="input"></param>
/// <param name="offset"></param>
/// <param name="count"></param>
/// <remarks>The RFC Named it MD5Update</remarks>
protected virtual void HashCore(byte[] input, int offset, int count)
{
int i;
int index;
int partLen;
// Compute number of bytes mod 64
index = (int)((this.count[0] >> 3) & 0x3F);
// Update number of bits
if ((this.count[0] += (uint)((uint)count << 3)) < ((uint)count << 3))
this.count[1]++;
this.count[1] += ((uint)count >> 29);
partLen = 64 - index;
// Transform as many times as possible.
if (count >= partLen)
{
Buffer.BlockCopy(input, offset, this.buffer, index, partLen);
Transform(this.buffer, 0);
for (i = partLen; i + 63 < count; i += 64)
Transform(input, offset + i);
index = 0;
}
else
i = 0;
// Buffer remaining input
Buffer.BlockCopy(input, offset + i, this.buffer, index, count - i);
}
/// <summary>
/// MD5 finalization. Ends an MD5 message-digest operation, writing the
/// the message digest and zeroizing the context.
/// </summary>
/// <returns>message digest</returns>
/// <remarks>The RFC named it MD5Final</remarks>
protected virtual byte[] HashFinal()
{
byte[] digest = new byte[16];
byte[] bits = new byte[8];
int index, padLen;
// Save number of bits
Encode(bits, 0, this.count, 0, 8);
// Pad out to 56 mod 64.
index = (int)((uint)(this.count[0] >> 3) & 0x3f);
padLen = (index < 56) ? (56 - index) : (120 - index);
HashCore(PADDING, 0, padLen);
// Append length (before padding)
HashCore(bits, 0, 8);
// Store state in digest
Encode(digest, 0, state, 0, 16);
// Zeroize sensitive information.
count[0] = count[1] = 0;
state[0] = 0;
state[1] = 0;
state[2] = 0;
state[3] = 0;
// initialize again, to be ready to use
Initialize();
return digest;
}
/// <summary>
/// MD5 basic transformation. Transforms state based on 64 bytes block.
/// </summary>
/// <param name="block"></param>
/// <param name="offset"></param>
private void Transform(byte[] block, int offset)
{
uint a = state[0], b = state[1], c = state[2], d = state[3];
uint[] x = new uint[16];
Decode(x, 0, block, offset, 64);
// Round 1
FF(ref a, b, c, d, x[0], S11, 0xd76aa478); /* 1 */
FF(ref d, a, b, c, x[1], S12, 0xe8c7b756); /* 2 */
FF(ref c, d, a, b, x[2], S13, 0x242070db); /* 3 */
FF(ref b, c, d, a, x[3], S14, 0xc1bdceee); /* 4 */
FF(ref a, b, c, d, x[4], S11, 0xf57c0faf); /* 5 */
FF(ref d, a, b, c, x[5], S12, 0x4787c62a); /* 6 */
FF(ref c, d, a, b, x[6], S13, 0xa8304613); /* 7 */
FF(ref b, c, d, a, x[7], S14, 0xfd469501); /* 8 */
FF(ref a, b, c, d, x[8], S11, 0x698098d8); /* 9 */
FF(ref d, a, b, c, x[9], S12, 0x8b44f7af); /* 10 */
FF(ref c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
FF(ref b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
FF(ref a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
FF(ref d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
FF(ref c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
FF(ref b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
// Round 2
GG(ref a, b, c, d, x[1], S21, 0xf61e2562); /* 17 */
GG(ref d, a, b, c, x[6], S22, 0xc040b340); /* 18 */
GG(ref c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
GG(ref b, c, d, a, x[0], S24, 0xe9b6c7aa); /* 20 */
GG(ref a, b, c, d, x[5], S21, 0xd62f105d); /* 21 */
GG(ref d, a, b, c, x[10], S22, 0x2441453); /* 22 */
GG(ref c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
GG(ref b, c, d, a, x[4], S24, 0xe7d3fbc8); /* 24 */
GG(ref a, b, c, d, x[9], S21, 0x21e1cde6); /* 25 */
GG(ref d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
GG(ref c, d, a, b, x[3], S23, 0xf4d50d87); /* 27 */
GG(ref b, c, d, a, x[8], S24, 0x455a14ed); /* 28 */
GG(ref a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
GG(ref d, a, b, c, x[2], S22, 0xfcefa3f8); /* 30 */
GG(ref c, d, a, b, x[7], S23, 0x676f02d9); /* 31 */
GG(ref b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
// Round 3
HH(ref a, b, c, d, x[5], S31, 0xfffa3942); /* 33 */
HH(ref d, a, b, c, x[8], S32, 0x8771f681); /* 34 */
HH(ref c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
HH(ref b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
HH(ref a, b, c, d, x[1], S31, 0xa4beea44); /* 37 */
HH(ref d, a, b, c, x[4], S32, 0x4bdecfa9); /* 38 */
HH(ref c, d, a, b, x[7], S33, 0xf6bb4b60); /* 39 */
HH(ref b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
HH(ref a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
HH(ref d, a, b, c, x[0], S32, 0xeaa127fa); /* 42 */
HH(ref c, d, a, b, x[3], S33, 0xd4ef3085); /* 43 */
HH(ref b, c, d, a, x[6], S34, 0x4881d05); /* 44 */
HH(ref a, b, c, d, x[9], S31, 0xd9d4d039); /* 45 */
HH(ref d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
HH(ref c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
HH(ref b, c, d, a, x[2], S34, 0xc4ac5665); /* 48 */
// Round 4
II(ref a, b, c, d, x[0], S41, 0xf4292244); /* 49 */
II(ref d, a, b, c, x[7], S42, 0x432aff97); /* 50 */
II(ref c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
II(ref b, c, d, a, x[5], S44, 0xfc93a039); /* 52 */
II(ref a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
II(ref d, a, b, c, x[3], S42, 0x8f0ccc92); /* 54 */
II(ref c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
II(ref b, c, d, a, x[1], S44, 0x85845dd1); /* 56 */
II(ref a, b, c, d, x[8], S41, 0x6fa87e4f); /* 57 */
II(ref d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
II(ref c, d, a, b, x[6], S43, 0xa3014314); /* 59 */
II(ref b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
II(ref a, b, c, d, x[4], S41, 0xf7537e82); /* 61 */
II(ref d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
II(ref c, d, a, b, x[2], S43, 0x2ad7d2bb); /* 63 */
II(ref b, c, d, a, x[9], S44, 0xeb86d391); /* 64 */
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
// Zeroize sensitive information.
for (int i = 0; i < x.Length; i++)
x[i] = 0;
}
/// <summary>
/// Encodes input (uint) into output (byte). Assumes len is
/// multiple of 4.
/// </summary>
/// <param name="output"></param>
/// <param name="outputOffset"></param>
/// <param name="input"></param>
/// <param name="inputOffset"></param>
/// <param name="count"></param>
private static void Encode(byte[] output, int outputOffset, uint[] input, int inputOffset, int count)
{
int i, j;
int end = outputOffset + count;
for (i = inputOffset, j = outputOffset; j < end; i++, j += 4)
{
output[j] = (byte)(input[i] & 0xff);
output[j + 1] = (byte)((input[i] >> 8) & 0xff);
output[j + 2] = (byte)((input[i] >> 16) & 0xff);
output[j + 3] = (byte)((input[i] >> 24) & 0xff);
}
}
/// <summary>
/// Decodes input (byte) into output (uint). Assumes len is
/// a multiple of 4.
/// </summary>
/// <param name="output"></param>
/// <param name="outputOffset"></param>
/// <param name="input"></param>
/// <param name="inputOffset"></param>
/// <param name="count"></param>
static private void Decode(uint[] output, int outputOffset, byte[] input, int inputOffset, int count)
{
int i, j;
int end = inputOffset + count;
for (i = outputOffset, j = inputOffset; j < end; i++, j += 4)
output[i] = ((uint)input[j]) | (((uint)input[j + 1]) << 8) | (((uint)input[j + 2]) << 16) | (((uint)input[j + 3]) <<
24);
}
#endregion
#region expose the same interface as the regular MD5 object
protected byte[] HashValue;
protected int State;
public virtual bool CanReuseTransform
{
get
{
return true;
}
}
public virtual bool CanTransformMultipleBlocks
{
get
{
return true;
}
}
public virtual byte[] Hash
{
get
{
if (this.State != 0)
throw new InvalidOperationException();
return (byte[])HashValue.Clone();
}
}
public virtual int HashSize
{
get
{
return HashSizeValue;
}
}
protected int HashSizeValue = 128;
public virtual int InputBlockSize
{
get
{
return 1;
}
}
public virtual int OutputBlockSize
{
get
{
return 1;
}
}
public void Clear()
{
Dispose(true);
}
public byte[] ComputeHash(byte[] buffer)
{
return ComputeHash(buffer, 0, buffer.Length);
}
public byte[] ComputeHash(byte[] buffer, int offset, int count)
{
Initialize();
HashCore(buffer, offset, count);
HashValue = HashFinal();
return (byte[])HashValue.Clone();
}
public byte[] ComputeHash(Stream inputStream)
{
Initialize();
int count = 0;
byte[] buffer = new byte[4096];
while (0 < (count = inputStream.Read(buffer, 0, 4096)))
{
HashCore(buffer, 0, count);
}
HashValue = HashFinal();
return (byte[])HashValue.Clone();
}
public int TransformBlock(
byte[] inputBuffer,
int inputOffset,
int inputCount,
byte[] outputBuffer,
int outputOffset
)
{
if (inputBuffer == null)
{
throw new ArgumentNullException("inputBuffer");
}
if (inputOffset < 0)
{
throw new ArgumentOutOfRangeException("inputOffset");
}
if ((inputCount < 0) || (inputCount > inputBuffer.Length))
{
throw new ArgumentException("inputCount");
}
if ((inputBuffer.Length - inputCount) < inputOffset)
{
throw new ArgumentOutOfRangeException("inputOffset");
}
if (this.State == 0)
{
Initialize();
this.State = 1;
}
HashCore(inputBuffer, inputOffset, inputCount);
if ((inputBuffer != outputBuffer) || (inputOffset != outputOffset))
{
Buffer.BlockCopy(inputBuffer, inputOffset, outputBuffer, outputOffset, inputCount);
}
return inputCount;
}
public byte[] TransformFinalBlock(
byte[] inputBuffer,
int inputOffset,
int inputCount
)
{
if (inputBuffer == null)
{
throw new ArgumentNullException("inputBuffer");
}
if (inputOffset < 0)
{
throw new ArgumentOutOfRangeException("inputOffset");
}
if ((inputCount < 0) || (inputCount > inputBuffer.Length))
{
throw new ArgumentException("inputCount");
}
if ((inputBuffer.Length - inputCount) < inputOffset)
{
throw new ArgumentOutOfRangeException("inputOffset");
}
if (this.State == 0)
{
Initialize();
}
HashCore(inputBuffer, inputOffset, inputCount);
HashValue = HashFinal();
byte[] buffer = new byte[inputCount];
Buffer.BlockCopy(inputBuffer, inputOffset, buffer, 0, inputCount);
this.State = 0;
return buffer;
}
#endregion
protected virtual void Dispose(bool disposing)
{
if (!disposing)
Initialize();
}
public void Dispose()
{
Dispose(true);
}
}
}
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