http://www.cnblogs.com/whitetiger/archive/2007/03/25/687286.html
当我要写一个MD5算法的程序时,发现中英文的语言描述都有一些不确切的地方,某些个细节
讲得不清楚,或者说很费解。最后不得不拿出C语言的源程序来调试,这对于理解算法是很不
利的。于是就总结了一下我摸索到的一些要点。
1.来历
MD5的全称是message-digest algorithm 5(信息-摘要算法,在90年代初由mit laboratory
for computer science和rsa data security inc的ronald l. rivest开发出来,
经md2、md3和md4发展而来。http://www.ietf.org/rfc/rfc1321.txt,是一份最权威的文档,
由ronald l. rivest在1992年8月向ieft提交。
2.用途
MD5的作用是对一段信息(message)生成信息摘要(message-digest),该摘要对该信息具有
唯一性,可以作为数字签名。用于验证文件的有效性(是否有丢失或损坏的数据),对用户
密码的加密,在哈希函数中计算散列值。
3.特点
输入一个任意长度的字节串,生成一个128位的整数。由于算法的某些不可逆特征,在加密应用
上有较好的安全性。并且,MD5算法的使用不需要支付任何版权费用。
4.说明
唯一性和不可逆性都不是绝对的,从理论上分析是一种多对一的关系,但两个不同的信息产生
相同摘要的概率很小。不可逆是指从输出反推输入所需的运算量和计算时间太大,使用穷搜字
典的方法又需要太多的存储空间。
5.算法描述
算法输入是一个字节串,每个字节是8个bit.
算法的执行分为以下几个步骤:
第一步,补位:
MD5算法先对输入的数据进行补位,使得数据的长度(以byte为单位)对64求余的结果是56。
即数据扩展至LEN=K*64+56个字节,K为整数。
补位方法:补一个1,然后补0至满足上述要求。相当于补一个0x80的字节,再补值
为0的字节。这一步里总共补充的字节数为0~63个。
第二步,附加数据长度:
用一个64位的整数表示数据的原始长度(以bit为单位),将这个数字的8个字节按低位的在前,
高位在后的顺序附加在补位后的数据后面。这时,数据被填补后的总长度为:
LEN = K*64+56+8=(K+1)*64 Bytes。
※注意那个64位整数是输入数据的原始长度而不是填充字节后的长度,我就在这里栽了跟头.
第三步,初始化MD5参数:
有四个32位整数变量 (A,B,C,D) 用来计算信息摘要,每一个变量被初始化成以下
以十六进制数表示的数值,低位的字节在前面。
word A: 01 23 45 67
word B: 89 ab cd ef
word C: fe dc ba 98
word D: 76 54 32 10
※注意低位的字节在前面指的是Little Endian平台上内存中字节的排列方式,
而在程序中书写时,要写成:
A=0x67452301
B=0xefcdab89
C=0x98badcfe
D=0x10325476
第四步,定义四个MD5基本的按位操作函数:
X,Y,Z为32位整数。
F(X,Y,Z) = (X and Y) or (not(X) and Z)
G(X,Y,Z) = (X and Z) or (Y and not(Z))
H(X,Y,Z) = X xor Y xor Z
I(X,Y,Z) = Y xor (X or not(Z))
再定义四个分别用于四轮变换的函数。
设Mj表示消息的第j个子分组(从0到15),<<<s表示循环左移s位,则四种操作为:
FF(a,b,c,d,Mj,s,ti)表示a=b+((a+(F(b,c,d)+Mj+ti)<<<s)
GG(a,b,c,d,Mj,s,ti)表示a=b+((a+(G(b,c,d)+Mj+ti)<<<s)
HH(a,b,c,d,Mj,s,ti)表示a=b+((a+(H(b,c,d)+Mj+ti)<<<s)
II(a,b,c,d,Mj,s,ti)表示a=b+((a+(I(b,c,d)+Mj+ti)<<<s)
第五步,对输入数据作变换。
处理数据,N是总的字节数,以64个字节为一组,每组作一次循环,每次循环进行四轮操作。
要变换的64个字节用16个32位的整数数组M[0 ...15]表示。而数组T[1 ... 64]表示一组常数,
T[i]为4294967296*abs(sin(i))的32位整数部分,i的单位是弧度,i的取值从1到64。
具体过程如下:
/* 设置主循环变量 */
For i = 0 to N/16-1 do
/*每循环一次,把数据原文存放在16个元素的数组X中. */
For j = 0 to 15 do
Set X[j] to M[i*16+j].
end /结束对J的循环
/* Save A as AA, B as BB, C as CC, and D as DD.
*/
AA = A
BB = B
CC = C
DD = D
/* 第1轮*/
/* 以 [abcd k s i]表示如下操作
a = b + ((a + F(b,c,d) + X[k] + T[i]) <<< s). */
/* Do the following 16 operations. */
[ABCD 0 7 1] [DABC 1 12 2] [CDAB 2 17 3] [BCDA 3 22 4]
[ABCD 4 7 5] [DABC 5 12 6] [CDAB 6 17 7] [BCDA 7 22 8]
[ABCD 8 7 9] [DABC 9 12 10] [CDAB 10 17 11] [BCDA 11 22 12]
[ABCD 12 7 13] [DABC 13 12 14] [CDAB 14 17 15] [BCDA 15 22 16]
/* 第2轮* */
/* 以 [abcd k s i]表示如下操作
a = b + ((a + G(b,c,d) + X[k] + T[i]) <<< s). */
/* Do the following 16 operations. */
[ABCD 1 5 17] [DABC 6 9 18] [CDAB 11 14 19] [BCDA 0 20 20]
[ABCD 5 5 21] [DABC 10 9 22] [CDAB 15 14 23] [BCDA 4 20 24]
[ABCD 9 5 25] [DABC 14 9 26] [CDAB 3 14 27] [BCDA 8 20 28]
[ABCD 13 5 29] [DABC 2 9 30] [CDAB 7 14 31] [BCDA 12 20 32]
/* 第3轮*/
/* 以 [abcd k s i]表示如下操作
a = b + ((a + H(b,c,d) + X[k] + T[i]) <<< s). */
/* Do the following 16 operations. */
[ABCD 5 4 33] [DABC 8 11 34] [CDAB 11 16 35] [BCDA 14 23 36]
[ABCD 1 4 37] [DABC 4 11 38] [CDAB 7 16 39] [BCDA 10 23 40]
[ABCD 13 4 41] [DABC 0 11 42] [CDAB 3 16 43] [BCDA 6 23 44]
[ABCD 9 4 45] [DABC 12 11 46] [CDAB 15 16 47] [BCDA 2 23 48]
/* 第4轮*/
/* 以 [abcd k s i]表示如下操作
a = b + ((a + I(b,c,d) + X[k] + T[i]) <<< s). */
/* Do the following 16 operations. */
[ABCD 0 6 49] [DABC 7 10 50] [CDAB 14 15 51] [BCDA 5 21 52]
[ABCD 12 6 53] [DABC 3 10 54] [CDAB 10 15 55] [BCDA 1 21 56]
[ABCD 8 6 57] [DABC 15 10 58] [CDAB 6 15 59] [BCDA 13 21 60]
[ABCD 4 6 61] [DABC 11 10 62] [CDAB 2 15 63] [BCDA 9 21 64]
/* 然后进行如下操作 */
A = A + AA
B = B + BB
C = C + CC
D = D + DD
Next i /* 结束对I的循环*/
第六步,输出结果。
A,B,C,D连续存放,共16个字节,128位。按十六进制依次输出这个16个字节。
最后,用程序语言实现算法后,可以输入以下几个信息对程序作一个简单的测试,
看看程序有没有错误。
MD5 ("") = d41d8cd98f00b204e9800998ecf8427e
MD5 ("a") = 0cc175b9c0f1b6a831c399e269772661
MD5 ("abc") = 900150983cd24fb0d6963f7d28e17f72
MD5 ("message digest") = f96b697d7cb7938d525a2f31aaf161d0
MD5 ("abcdefghijklmnopqrstuvwxyz") = c3fcd3d76192e4007dfb496cca67e13b
MD5 ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789") =
d174ab98d277d9f5a5611c2c9f419d9f
MD5 ("123456789012345678901234567890123456789012345678901234567890123456789
01234567890") = 57edf4a22be3c955ac49da2e2107b67a
MD5算法之C#程序
MD5算法比较特别,最适合用汇编语言来写,好多高级语言对之无能无力或效率极低。
比如我最开始尝试用Python和Euphoria编写,发现不太容易。相比而言,C#作为C家簇
中新兴的一门.net语言,功能比较全面。花了一晚上的工夫终于用C#最先实现了MD5。
主要是由于对算法的一些细节不太注意,结果输出总是不对,调试了好长时间。
[code]
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//源文件:md5.cs
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// MD5 Alogrithm
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// by rufi 2004.6.20 http://rufi.yculblog.com/
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using System;
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using System.Collections;
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using System.IO;
7![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
8![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
public class MD5
{
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//static state variables
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private static UInt32 A;
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private static UInt32 B;
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private static UInt32 C;
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private static UInt32 D;
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//number of bits to rotate in tranforming
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private const int S11 = 7;
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private const int S12 = 12;
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private const int S13 = 17;
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private const int S14 = 22;
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private const int S21 = 5;
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private const int S22 = 9;
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private const int S23 = 14;
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private const int S24 = 20;
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private const int S31 = 4;
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private const int S32 = 11;
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private const int S33 = 16;
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private const int S34 = 23;
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private const int S41 = 6;
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private const int S42 = 10;
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private const int S43 = 15;
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private const int S44 = 21;
32![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
33![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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/**//* F, G, H and I are basic MD5 functions.
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* 四个非线性函数:
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*
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* F(X,Y,Z) =(X&Y)|((~X)&Z)
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* G(X,Y,Z) =(X&Z)|(Y&(~Z))
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* H(X,Y,Z) =X^Y^Z
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* I(X,Y,Z)=Y^(X|(~Z))
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*
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* (&与,|或,~非,^异或)
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*/
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private static UInt32 F(UInt32 x,UInt32 y,UInt32 z)
{
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return (x&y)|((~x)&z);
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}
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private static UInt32 G(UInt32 x,UInt32 y,UInt32 z)
{
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return (x&z)|(y&(~z));
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}
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private static UInt32 H(UInt32 x,UInt32 y,UInt32 z)
{
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return x^y^z;
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}
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private static UInt32 I(UInt32 x,UInt32 y,UInt32 z)
{
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return y^(x|(~z));
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}
56![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
57![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/**//* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
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* Rotation is separate from addition to prevent recomputation.
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*/
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private static void FF(ref UInt32 a,UInt32 b,UInt32 c,UInt32 d,UInt32 mj,int s,UInt32 ti)
{
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a = a + F(b,c,d) + mj + ti;
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a = a << s | a >> (32-s);
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a += b;
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}
65![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
private static void GG(ref UInt32 a,UInt32 b,UInt32 c,UInt32 d,UInt32 mj,int s,UInt32 ti)
{
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a = a + G(b,c,d) + mj + ti;
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a = a << s | a >> (32-s);
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a += b;
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}
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private static void HH(ref UInt32 a,UInt32 b,UInt32 c,UInt32 d,UInt32 mj,int s,UInt32 ti)
{
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a = a + H(b,c,d) + mj + ti;
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a = a << s | a >> (32-s);
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a += b;
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}
75![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
private static void II(ref UInt32 a,UInt32 b,UInt32 c,UInt32 d,UInt32 mj,int s,UInt32 ti)
{
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a = a + I(b,c,d) + mj + ti;
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a = a << s | a >> (32-s);
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a += b;
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}
80![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
81![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
private static void MD5_Init()
{
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A=0x67452301; //in memory, this is 0x01234567
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B=0xefcdab89; //in memory, this is 0x89abcdef
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C=0x98badcfe; //in memory, this is 0xfedcba98
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D=0x10325476; //in memory, this is 0x76543210
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}
87![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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private static UInt32[] MD5_Append(byte[] input)
{
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int zeros=0;
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int ones =1;
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int size=0;
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int n = input.Length;
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int m = n%64;
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if( m < 56 )
{
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zeros = 55-m;
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size=n-m+64;
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}
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else if (m==56)
{
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zeros = 0;
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ones = 0;
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size=n+8;
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}
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else
{
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zeros = 63-m+56;
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size=n+64-m+64;
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}
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ArrayList bs = new ArrayList(input);
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if(ones==1)
{
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bs.Add( (byte)0x80 ); // 0x80 = $10000000
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}
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for(int i=0;i<zeros;i++)
{
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bs.Add( (byte)0 );
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}
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UInt64 N = (UInt64) n * 8;
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byte h1=(byte)(N&0xFF);
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byte h2=(byte)((N>>8)&0xFF);
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byte h3=(byte)((N>>16)&0xFF);
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byte h4=(byte)((N>>24)&0xFF);
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byte h5=(byte)((N>>32)&0xFF);
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byte h6=(byte)((N>>40)&0xFF);
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byte h7=(byte)((N>>48)&0xFF);
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byte h8=(byte)(N>>56);
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bs.Add(h1);
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bs.Add(h2);
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bs.Add(h3);
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bs.Add(h4);
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bs.Add(h5);
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bs.Add(h6);
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bs.Add(h7);
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bs.Add(h8);
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byte[] ts=(byte[])bs.ToArray(typeof(byte));
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/**//* Decodes input (byte[]) into output (UInt32[]). Assumes len is
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* a multiple of 4.
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*/
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UInt32[] output = new UInt32[size/4];
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for(Int64 i=0,j=0;i<size;j++,i+=4)
{
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output[j]=(UInt32)(ts[i] | ts[i+1]<<8 | ts[i+2]<<16 | ts[i+3]<<24);
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}
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return output;
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}
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private static UInt32[] MD5_Trasform(UInt32[] x)
{
145![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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UInt32 a,b,c,d;
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for(int k=0;k<x.Length;k+=16)
{
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a=A;
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b=B;
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c=C;
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d=D;
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/**//* Round 1 */
155![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
FF (ref a, b, c, d, x[k+ 0], S11, 0xd76aa478); /**//* 1 */
156![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
FF (ref d, a, b, c, x[k+ 1], S12, 0xe8c7b756); /**//* 2 */
157![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
FF (ref c, d, a, b, x[k+ 2], S13, 0x242070db); /**//* 3 */
158![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
FF (ref b, c, d, a, x[k+ 3], S14, 0xc1bdceee); /**//* 4 */
159![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
FF (ref a, b, c, d, x[k+ 4], S11, 0xf57c0faf); /**//* 5 */
160![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
FF (ref d, a, b, c, x[k+ 5], S12, 0x4787c62a); /**//* 6 */
161![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
FF (ref c, d, a, b, x[k+ 6], S13, 0xa8304613); /**//* 7 */
162![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
FF (ref b, c, d, a, x[k+ 7], S14, 0xfd469501); /**//* 8 */
163![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
FF (ref a, b, c, d, x[k+ 8], S11, 0x698098d8); /**//* 9 */
164![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
FF (ref d, a, b, c, x[k+ 9], S12, 0x8b44f7af); /**//* 10 */
165![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
FF (ref c, d, a, b, x[k+10], S13, 0xffff5bb1); /**//* 11 */
166![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
FF (ref b, c, d, a, x[k+11], S14, 0x895cd7be); /**//* 12 */
167![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
FF (ref a, b, c, d, x[k+12], S11, 0x6b901122); /**//* 13 */
168![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
FF (ref d, a, b, c, x[k+13], S12, 0xfd987193); /**//* 14 */
169![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
FF (ref c, d, a, b, x[k+14], S13, 0xa679438e); /**//* 15 */
170![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
FF (ref b, c, d, a, x[k+15], S14, 0x49b40821); /**//* 16 */
171![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
172![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/**//* Round 2 */
173![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
GG (ref a, b, c, d, x[k+ 1], S21, 0xf61e2562); /**//* 17 */
174![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
GG (ref d, a, b, c, x[k+ 6], S22, 0xc040b340); /**//* 18 */
175![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
GG (ref c, d, a, b, x[k+11], S23, 0x265e5a51); /**//* 19 */
176![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
GG (ref b, c, d, a, x[k+ 0], S24, 0xe9b6c7aa); /**//* 20 */
177![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
GG (ref a, b, c, d, x[k+ 5], S21, 0xd62f105d); /**//* 21 */
178![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
GG (ref d, a, b, c, x[k+10], S22, 0x2441453); /**//* 22 */
179![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
GG (ref c, d, a, b, x[k+15], S23, 0xd8a1e681); /**//* 23 */
180![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
GG (ref b, c, d, a, x[k+ 4], S24, 0xe7d3fbc8); /**//* 24 */
181![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
GG (ref a, b, c, d, x[k+ 9], S21, 0x21e1cde6); /**//* 25 */
182![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
GG (ref d, a, b, c, x[k+14], S22, 0xc33707d6); /**//* 26 */
183![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
GG (ref c, d, a, b, x[k+ 3], S23, 0xf4d50d87); /**//* 27 */
184![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
GG (ref b, c, d, a, x[k+ 8], S24, 0x455a14ed); /**//* 28 */
185![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
GG (ref a, b, c, d, x[k+13], S21, 0xa9e3e905); /**//* 29 */
186![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
GG (ref d, a, b, c, x[k+ 2], S22, 0xfcefa3f8); /**//* 30 */
187![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
GG (ref c, d, a, b, x[k+ 7], S23, 0x676f02d9); /**//* 31 */
188![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
GG (ref b, c, d, a, x[k+12], S24, 0x8d2a4c8a); /**//* 32 */
189![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
190![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/**//* Round 3 */
191![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
HH (ref a, b, c, d, x[k+ 5], S31, 0xfffa3942); /**//* 33 */
192![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
HH (ref d, a, b, c, x[k+ 8], S32, 0x8771f681); /**//* 34 */
193![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
HH (ref c, d, a, b, x[k+11], S33, 0x6d9d6122); /**//* 35 */
194![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
HH (ref b, c, d, a, x[k+14], S34, 0xfde5380c); /**//* 36 */
195![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
HH (ref a, b, c, d, x[k+ 1], S31, 0xa4beea44); /**//* 37 */
196![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
HH (ref d, a, b, c, x[k+ 4], S32, 0x4bdecfa9); /**//* 38 */
197![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
HH (ref c, d, a, b, x[k+ 7], S33, 0xf6bb4b60); /**//* 39 */
198![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
HH (ref b, c, d, a, x[k+10], S34, 0xbebfbc70); /**//* 40 */
199![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
HH (ref a, b, c, d, x[k+13], S31, 0x289b7ec6); /**//* 41 */
200![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
HH (ref d, a, b, c, x[k+ 0], S32, 0xeaa127fa); /**//* 42 */
201![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
HH (ref c, d, a, b, x[k+ 3], S33, 0xd4ef3085); /**//* 43 */
202![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
HH (ref b, c, d, a, x[k+ 6], S34, 0x4881d05); /**//* 44 */
203![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
HH (ref a, b, c, d, x[k+ 9], S31, 0xd9d4d039); /**//* 45 */
204![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
HH (ref d, a, b, c, x[k+12], S32, 0xe6db99e5); /**//* 46 */
205![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
HH (ref c, d, a, b, x[k+15], S33, 0x1fa27cf8); /**//* 47 */
206![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
HH (ref b, c, d, a, x[k+ 2], S34, 0xc4ac5665); /**//* 48 */
207![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
208![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/**//* Round 4 */
209![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
II (ref a, b, c, d, x[k+ 0], S41, 0xf4292244); /**//* 49 */
210![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
II (ref d, a, b, c, x[k+ 7], S42, 0x432aff97); /**//* 50 */
211![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
II (ref c, d, a, b, x[k+14], S43, 0xab9423a7); /**//* 51 */
212![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
II (ref b, c, d, a, x[k+ 5], S44, 0xfc93a039); /**//* 52 */
213![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
II (ref a, b, c, d, x[k+12], S41, 0x655b59c3); /**//* 53 */
214![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
II (ref d, a, b, c, x[k+ 3], S42, 0x8f0ccc92); /**//* 54 */
215![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
II (ref c, d, a, b, x[k+10], S43, 0xffeff47d); /**//* 55 */
216![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
II (ref b, c, d, a, x[k+ 1], S44, 0x85845dd1); /**//* 56 */
217![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
II (ref a, b, c, d, x[k+ 8], S41, 0x6fa87e4f); /**//* 57 */
218![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
II (ref d, a, b, c, x[k+15], S42, 0xfe2ce6e0); /**//* 58 */
219![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
II (ref c, d, a, b, x[k+ 6], S43, 0xa3014314); /**//* 59 */
220![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
II (ref b, c, d, a, x[k+13], S44, 0x4e0811a1); /**//* 60 */
221![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
II (ref a, b, c, d, x[k+ 4], S41, 0xf7537e82); /**//* 61 */
222![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
II (ref d, a, b, c, x[k+11], S42, 0xbd3af235); /**//* 62 */
223![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
II (ref c, d, a, b, x[k+ 2], S43, 0x2ad7d2bb); /**//* 63 */
224![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
II (ref b, c, d, a, x[k+ 9], S44, 0xeb86d391); /**//* 64 */
225![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
226
A+=a;
227
B+=b;
228
C+=c;
229
D+=d;
230
}
231![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
return new UInt32[]
{A,B,C,D};
232
}
233![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
public static byte[] MD5Array(byte[] input)
{
234
MD5_Init();
235
UInt32[] block = MD5_Append(input);
236
UInt32[] bits = MD5_Trasform(block);
237![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
238![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/**//* Encodes bits (UInt32[]) into output (byte[]). Assumes len is
239
* a multiple of 4.
240
*/
241
byte[] output=new byte[bits.Length*4];
242![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
for(int i=0,j=0;i<bits.Length;i++,j+=4)
{
243
output[j] = (byte)(bits[i] & 0xff);
244
output[j+1] = (byte)((bits[i] >> 8) & 0xff);
245
output[j+2] = (byte)((bits[i] >> 16) & 0xff);
246
output[j+3] = (byte)((bits[i] >> 24) & 0xff);
247
}
248
return output;
249
}
250![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
251![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
public static string ArrayToHexString(byte[] array,bool uppercase)
{
252
string hexString="";
253
string format="x2";
254![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
if(uppercase)
{
255
format="X2";
256
}
257![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
foreach(byte b in array)
{
258
hexString += b.ToString(format);
259
}
260
return hexString;
261
}
262![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
263![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
public static string MDString(string message)
{
264
char[] c = message.ToCharArray();
265
byte[] b = new byte[c.Length];
266![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
for(int i=0;i<c.Length;i++)
{
267
b[i]=(byte)c[i];
268
}
269
byte[] digest = MD5Array(b);
270
return ArrayToHexString(digest,false);
271
}
272![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
public static string MDFile(string fileName)
{
273
FileStream fs=File.Open(fileName,FileMode.Open,FileAccess.Read);
274
byte[] array=new byte[fs.Length];
275
fs.Read(array,0,(int)fs.Length);
276
byte[] digest = MD5Array(array);
277
fs.Close();
278
return ArrayToHexString(digest,false);
279
}
280![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
281![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
public static string Test(string message)
{
282
return "rnMD5 (""+message+"") = " + MD5.MDString(message);
283
}
284![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
public static string TestSuite()
{
285
string s = "";
286
s+=Test("");
287
s+=Test("a");
288
s+=Test("abc");
289
s+=Test("message digest");
290
s+=Test("abcdefghijklmnopqrstuvwxyz");
291
s+=Test("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789");
292
s+=Test("12345678901234567890123456789012345678901234567890123456789012345678901234567890");
293
return s;
294
}
295
}
296![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
[/code]