📄 rfc1321---md5报文摘要算法--中文版.htm
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<P>#if MD == 2<BR>#define MD_CTX MD2_CTX<BR>#define MDInit MD2Init<BR>#define
MDUpdate MD2Update<BR>#define MDFinal MD2Final<BR>#endif<BR>#if MD ==
4<BR>#define MD_CTX MD4_CTX<BR>#define MDInit MD4Init<BR>#define MDUpdate
MD4Update<BR>#define MDFinal MD4Final<BR>#endif<BR>#if MD == 5<BR>#define MD_CTX
MD5_CTX<BR>#define MDInit MD5Init<BR>#define MDUpdate MD5Update<BR>#define
MDFinal MD5Final<BR>#endif</P>
<P>/* 主程序.<BR>变量:<BR> -sstring – 摘要字符串<BR>
-t - 运行时间测试<BR>
-x - 运行测试脚本<BR> filename –
摘要文件<BR> (none) - 摘要标准输入<BR> */<BR>int main (argc,
argv)<BR>int argc;</P>
<P>char *argv[];<BR>{<BR> int i;</P>
<P> if (argc > 1)<BR> for (i = 1; i < argc;
i++)<BR> if (argv[i][0] == '-' && argv[i][1] ==
's')<BR> MDString (argv[i] + 2);<BR> else if
(strcmp (argv[i], "-t") == 0)<BR> MDTimeTrial
();<BR> else if (strcmp (argv[i], "-x") ==
0)<BR> MDTestSuite ();<BR>
else<BR> MDFile (argv[i]);<BR>
else<BR> MDFilter ();</P>
<P> return (0);<BR>}</P>
<P>/* 计算字符串的摘要并打印其值 */<BR>static void MDString (string)<BR>char
*string;<BR>{<BR> MD_CTX context;<BR> unsigned char
digest[16];<BR> unsigned int len = strlen (string);</P>
<P> MDInit (&context);<BR> MDUpdate (&context, string,
len);<BR> MDFinal (digest, &context);</P>
<P> printf ("MD%d (\"%s\") = ", MD, string);<BR> MDPrint
(digest);<BR> printf ("\n");<BR>}</P>
<P>/* 测试计算 TEST_BLOCK_COUNT TEST_BLOCK_LEN-byte<BR> 分组摘要的时间
*/<BR>static void MDTimeTrial ()<BR>{<BR> MD_CTX context;<BR> time_t
endTime, startTime;<BR> unsigned char block[TEST_BLOCK_LEN],
digest[16];<BR> unsigned int i;</P>
<P> printf<BR> ("MD%d time trial. Digesting %d %d-byte blocks ...",
MD,<BR> TEST_BLOCK_LEN, TEST_BLOCK_COUNT);</P>
<P> /* 初始化分组*/<BR> for (i = 0; i < TEST_BLOCK_LEN;
i++)<BR> block[i] = (unsigned char)(i & 0xff);</P>
<P> /* 开始时钟 */<BR> time (&startTime);</P>
<P> /* 摘要分组 */<BR> MDInit (&context);<BR> for
(i = 0; i < TEST_BLOCK_COUNT; i++)<BR> MDUpdate (&context, block,
TEST_BLOCK_LEN);<BR> MDFinal (digest, &context);</P>
<P> /* 停止时钟 */<BR> time (&endTime);</P>
<P> printf (" done\n");<BR> printf ("Digest = ");<BR> MDPrint
(digest);<BR> printf ("\nTime = %ld seconds\n",
(long)(endTime-startTime));<BR> printf<BR> ("Speed = %ld
bytes/second\n",<BR> (long)TEST_BLOCK_LEN *
(long)TEST_BLOCK_COUNT/(endTime-startTime));<BR>}</P>
<P>/* 计算一个参考组件串的摘要并打印结果*/<BR>static void MDTestSuite ()<BR>{<BR> printf
("MD%d test suite:\n", MD);</P>
<P> MDString ("");<BR> MDString ("a");<BR> MDString
("abc");<BR> MDString ("message digest");<BR> MDString
("abcdefghijklmnopqrstuvwxyz");<BR>
MDString<BR> ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789");<BR>
MDString<BR> ("1234567890123456789012345678901234567890\<BR>1234567890123456789012345678901234567890");<BR>}</P>
<P>/*计算一个文件的摘要并打印结果 */<BR>static void MDFile (filename)<BR>char
*filename;<BR>{<BR> FILE *file;<BR> MD_CTX context;<BR> int
len;<BR> unsigned char buffer[1024], digest[16];</P>
<P> if ((file = fopen (filename, "rb")) == NULL)<BR> printf ("%s
can't be opened\n", filename);</P>
<P> else {<BR> MDInit (&context);<BR> while (len = fread
(buffer, 1, 1024, file))<BR> MDUpdate (&context, buffer,
len);<BR> MDFinal (digest, &context);</P>
<P> fclose (file);</P>
<P> printf ("MD%d (%s) = ", MD, filename);<BR> MDPrint
(digest);<BR> printf ("\n");<BR> }<BR>}</P>
<P>/* 计算标准输入的摘要并打印结果*/<BR>static void MDFilter ()<BR>{<BR> MD_CTX
context;<BR> int len;<BR> unsigned char buffer[16], digest[16];</P>
<P> MDInit (&context);<BR> while (len = fread (buffer, 1, 16,
stdin))<BR> MDUpdate (&context, buffer, len);<BR> MDFinal
(digest, &context);</P>
<P> MDPrint (digest);<BR> printf ("\n");<BR>}</P>
<P>/* 打印一个16进制的摘要*/<BR>static void MDPrint (digest)<BR>unsigned char
digest[16];<BR>{</P>
<P> unsigned int i;</P>
<P> for (i = 0; i < 16; i++)<BR> printf ("%02x",
digest[i]);<BR>}</P>
<P>A.5 测试组件</P>
<P> MD5 测试组件(驱动程序选项"-x")应打印以下值：</P>
<P>MD5 test suite:<BR>MD5 ("") = d41d8cd98f00b204e9800998ecf8427e<BR>MD5 ("a") =
0cc175b9c0f1b6a831c399e269772661<BR>MD5 ("abc") =
900150983cd24fb0d6963f7d28e17f72<BR>MD5 ("message digest") =
f96b697d7cb7938d525a2f31aaf161d0<BR>MD5 ("abcdefghijklmnopqrstuvwxyz") =
c3fcd3d76192e4007dfb496cca67e13b<BR>MD5
("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789")
=<BR>d174ab98d277d9f5a5611c2c9f419d9f<BR>MD5
("123456789012345678901234567890123456789012345678901234567890123456<BR>78901234567890")
= 57edf4a22be3c955ac49da2e2107b67a</P>
<P>8 安全事项<BR>本文中讨论的安全标准被认为已足够实现很高要求的基于公用密钥系统和MD5算法的数字签名<BR>系统中。
<BR>9 作者地址</P>
<P> Ronald L. Rivest<BR> Massachusetts Institute of
Technology<BR> Laboratory for Computer Science<BR>
NE43-324<BR> 545 Technology Square<BR> Cambridge,
MA 02139-1986</P>
<P> Phone: (617) 253-5880<BR> EMail: <A
href="mailto:rivest@theory.lcs.mit.edu">rivest@theory.lcs.mit.edu</A></P>
<P><BR>RFC1321——The MD5 Message-Digest
Algorithm
MD5 报文摘要算法<BR><A></A></P>
<P></P>
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<P class=comment>[2005-08-13 00:00:00.0] <A
title=基本算法(pascal版) href="http://zouyu9631.blogchina.com/2579728.html"
target=_blank>基本算法(pascal版)</A></P>
<P class=comment>[2005-08-22 00:00:00.0] <A
title=换个摘要吧，来点新意思 href="http://juliewitch.blogchina.com/2662080.html"
target=_blank>换个摘要吧，来点新意思</A></P>
<P class=comment>[2005-09-23 11:48:46.0] <A
title="Dijkstra 最短路径算法的一种高效率实现" href="http://wolfhai.blogchina.com/3010469.html"
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<P class=comment>[2005-08-12 00:00:00.0] <A title=如何写好摘要
href="http://yjsnudt.blogchina.com/2563716.html" target=_blank>如何写好摘要</A></P>
<P class=comment>[2005-08-13 00:00:00.0] <A
title=各种排序算法的比较 href="http://zouyu9631.blogchina.com/2575487.html"
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