最近我这里正在开发一个网站程序，现在需要MD5的加密解密。谁能帮忙写个MD5的ASP用加密，解密的函数。就是比如加密函数的参数是字符串值，返回值就为加密后的字符串。解密则相反。谁能写这样的函数，本人开发网站程序要用。谁能提供自当，万分感谢。

md5解密？？能写出来的人真的厉害。

MD5是不可逆的算法，虽然也会发生碰撞，但是可能性极小。

一般的MD5解密方法有两种，一是暴力猜解，一是字典查询（需要一个字典数据库）

[此贴子已经被作者于2005-4-20 0:11:34编辑过]

MD5是单向加密 我前两天看新闻说是现在已经在理论上证明了可以实现MD5的解密方法 但 只是理论上而已 到现在为止 只有暴力方法能破解 可惜 恐怕稍微困难的密码就不能被破解 加密程序有 以下是md5源代码和应用的例子 <% private const bits_to_a_byte = 8 private const bytes_to_a_word = 4 private const bits_to_a_word = 32 private m_lonbits(30) private m_l2power(30)

private function lshift(lvalue, ishiftbits) if ishiftbits = 0 then lshift = lvalue exit function elseif ishiftbits = 31 then if lvalue and 1 then lshift = &h80000000 else lshift = 0 end if exit function elseif ishiftbits < 0 or ishiftbits > 31 then err.raise 6 end if

if (lvalue and m_l2power(31 - ishiftbits)) then lshift = ((lvalue and m_lonbits(31 - (ishiftbits + 1))) * m_l2power(ishiftbits)) or &h80000000 else lshift = ((lvalue and m_lonbits(31 - ishiftbits)) * m_l2power(ishiftbits)) end if end function

private function rshift(lvalue, ishiftbits) if ishiftbits = 0 then rshift = lvalue exit function elseif ishiftbits = 31 then if lvalue and &h80000000 then rshift = 1 else rshift = 0 end if exit function elseif ishiftbits < 0 or ishiftbits > 31 then err.raise 6 end if

rshift = (lvalue and &h7ffffffe) \ m_l2power(ishiftbits)

if (lvalue and &h80000000) then rshift = (rshift or (&h40000000 \ m_l2power(ishiftbits - 1))) end if end function

private function rotateleft(lvalue, ishiftbits) rotateleft = lshift(lvalue, ishiftbits) or rshift(lvalue, (32 - ishiftbits)) end function

private function addunsigned(lx, ly) dim lx4 dim ly4 dim lx8 dim ly8 dim lresult

lx8 = lx and &h80000000 ly8 = ly and &h80000000 lx4 = lx and &h40000000 ly4 = ly and &h40000000

lresult = (lx and &h3fffffff) + (ly and &h3fffffff)

if lx4 and ly4 then lresult = lresult xor &h80000000 xor lx8 xor ly8 elseif lx4 or ly4 then if lresult and &h40000000 then lresult = lresult xor &hc0000000 xor lx8 xor ly8 else lresult = lresult xor &h40000000 xor lx8 xor ly8 end if else lresult = lresult xor lx8 xor ly8 end if

addunsigned = lresult end function

private function md5_f(x, y, z) md5_f = (x and y) or ((not x) and z) end function

private function md5_g(x, y, z) md5_g = (x and z) or (y and (not z)) end function

private function md5_h(x, y, z) md5_h = (x xor y xor z) end function

private function md5_i(x, y, z) md5_i = (y xor (x or (not z))) end function

private sub md5_ff(a, b, c, d, x, s, ac) a = addunsigned(a, addunsigned(addunsigned(md5_f(b, c, d), x), ac)) a = rotateleft(a, s) a = addunsigned(a, b) end sub

private sub md5_gg(a, b, c, d, x, s, ac) a = addunsigned(a, addunsigned(addunsigned(md5_g(b, c, d), x), ac)) a = rotateleft(a, s) a = addunsigned(a, b) end sub

private sub md5_hh(a, b, c, d, x, s, ac) a = addunsigned(a, addunsigned(addunsigned(md5_h(b, c, d), x), ac)) a = rotateleft(a, s) a = addunsigned(a, b) end sub

private sub md5_ii(a, b, c, d, x, s, ac) a = addunsigned(a, addunsigned(addunsigned(md5_i(b, c, d), x), ac)) a = rotateleft(a, s) a = addunsigned(a, b) end sub

private function converttowordarray(smessage) dim lmessagelength dim lnumberofwords dim lwordarray() dim lbyteposition dim lbytecount dim lwordcount

const modulus_bits = 512 const congruent_bits = 448

lmessagelength = len(smessage)

lnumberofwords = (((lmessagelength + ((modulus_bits - congruent_bits) \ bits_to_a_byte)) \ (modulus_bits \ bits_to_a_byte)) + 1) * (modulus_bits \ bits_to_a_word) redim lwordarray(lnumberofwords - 1)

lbyteposition = 0 lbytecount = 0 do until lbytecount >= lmessagelength lwordcount = lbytecount \ bytes_to_a_word lbyteposition = (lbytecount mod bytes_to_a_word) * bits_to_a_byte lwordarray(lwordcount) = lwordarray(lwordcount) or lshift(asc(mid(smessage, lbytecount + 1, 1)), lbyteposition) lbytecount = lbytecount + 1 loop

lwordcount = lbytecount \ bytes_to_a_word lbyteposition = (lbytecount mod bytes_to_a_word) * bits_to_a_byte

lwordarray(lwordcount) = lwordarray(lwordcount) or lshift(&h80, lbyteposition)

lwordarray(lnumberofwords - 2) = lshift(lmessagelength, 3) lwordarray(lnumberofwords - 1) = rshift(lmessagelength, 29)

converttowordarray = lwordarray end function

private function wordtohex(lvalue) dim lbyte dim lcount

for lcount = 0 to 3 lbyte = rshift(lvalue, lcount * bits_to_a_byte) and m_lonbits(bits_to_a_byte - 1) wordtohex = wordtohex & right("0" & hex(lbyte), 2) next end function

public function md5(smessage) m_lonbits(0) = clng(1) m_lonbits(1) = clng(3) m_lonbits(2) = clng(7) m_lonbits(3) = clng(15) m_lonbits(4) = clng(31) m_lonbits(5) = clng(63) m_lonbits(6) = clng(127) m_lonbits(7) = clng(255) m_lonbits(8) = clng(511) m_lonbits(9) = clng(1023) m_lonbits(10) = clng(2047) m_lonbits(11) = clng(4095) m_lonbits(12) = clng(8191) m_lonbits(13) = clng(16383) m_lonbits(14) = clng(32767) m_lonbits(15) = clng(65535) m_lonbits(16) = clng(131071) m_lonbits(17) = clng(262143) m_lonbits(18) = clng(524287) m_lonbits(19) = clng(1048575) m_lonbits(20) = clng(2097151) m_lonbits(21) = clng(4194303) m_lonbits(22) = clng(8388607) m_lonbits(23) = clng(16777215) m_lonbits(24) = clng(33554431) m_lonbits(25) = clng(67108863) m_lonbits(26) = clng(134217727) m_lonbits(27) = clng(268435455) m_lonbits(28) = clng(536870911) m_lonbits(29) = clng(1073741823) m_lonbits(30) = clng(2147483647) m_l2power(0) = clng(1) m_l2power(1) = clng(2) m_l2power(2) = clng(4) m_l2power(3) = clng(8) m_l2power(4) = clng(16) m_l2power(5) = clng(32) m_l2power(6) = clng(64) m_l2power(7) = clng(128) m_l2power(8) = clng(256) m_l2power(9) = clng(512) m_l2power(10) = clng(1024) m_l2power(11) = clng(2048) m_l2power(12) = clng(4096) m_l2power(13) = clng(8192) m_l2power(14) = clng(16384) m_l2power(15) = clng(32768) m_l2power(16) = clng(65536) m_l2power(17) = clng(131072) m_l2power(18) = clng(262144) m_l2power(19) = clng(524288) m_l2power(20) = clng(1048576) m_l2power(21) = clng(2097152) m_l2power(22) = clng(4194304) m_l2power(23) = clng(8388608) m_l2power(24) = clng(16777216) m_l2power(25) = clng(33554432) m_l2power(26) = clng(67108864) m_l2power(27) = clng(134217728) m_l2power(28) = clng(268435456) m_l2power(29) = clng(536870912) m_l2power(30) = clng(1073741824)

dim x dim k dim aa dim bb dim cc dim dd dim a dim b dim c dim d const s11 = 7 const s12 = 12 const s13 = 17 const s14 = 22 const s21 = 5 const s22 = 9 const s23 = 14 const s24 = 20 const s31 = 4 const s32 = 11 const s33 = 16 const s34 = 23 const s41 = 6 const s42 = 10 const s43 = 15 const s44 = 21

x = converttowordarray(smessage) a = &h67452301 b = &hefcdab89 c = &h98badcfe d = &h10325476

for k = 0 to ubound(x) step 16 aa = a bb = b cc = c dd = d md5_ff a, b, c, d, x(k + 0), s11, &hd76aa478 md5_ff d, a, b, c, x(k + 1), s12, &he8c7b756 md5_ff c, d, a, b, x(k + 2), s13, &h242070db md5_ff b, c, d, a, x(k + 3), s14, &hc1bdceee md5_ff a, b, c, d, x(k + 4), s11, &hf57c0faf md5_ff d, a, b, c, x(k + 5), s12, &h4787c62a md5_ff c, d, a, b, x(k + 6), s13, &ha8304613 md5_ff b, c, d, a, x(k + 7), s14, &hfd469501 md5_ff a, b, c, d, x(k + 8), s11, &h698098d8 md5_ff d, a, b, c, x(k + 9), s12, &h8b44f7af md5_ff c, d, a, b, x(k + 10), s13, &hffff5bb1 md5_ff b, c, d, a, x(k + 11), s14, &h895cd7be md5_ff a, b, c, d, x(k + 12), s11, &h6b901122 md5_ff d, a, b, c, x(k + 13), s12, &hfd987193 md5_ff c, d, a, b, x(k + 14), s13, &ha679438e md5_ff b, c, d, a, x(k + 15), s14, &h49b40821 md5_gg a, b, c, d, x(k + 1), s21, &hf61e2562 md5_gg d, a, b, c, x(k + 6), s22, &hc040b340 md5_gg c, d, a, b, x(k + 11), s23, &h265e5a51 md5_gg b, c, d, a, x(k + 0), s24, &he9b6c7aa md5_gg a, b, c, d, x(k + 5), s21, &hd62f105d md5_gg d, a, b, c, x(k + 10), s22, &h2441453 md5_gg c, d, a, b, x(k + 15), s23, &hd8a1e681 md5_gg b, c, d, a, x(k + 4), s24, &he7d3fbc8 md5_gg a, b, c, d, x(k + 9), s21, &h21e1cde6 md5_gg d, a, b, c, x(k + 14), s22, &hc33707d6 md5_gg c, d, a, b, x(k + 3), s23, &hf4d50d87 md5_gg b, c, d, a, x(k + 8), s24, &h455a14ed md5_gg a, b, c, d, x(k + 13), s21, &ha9e3e905 md5_gg d, a, b, c, x(k + 2), s22, &hfcefa3f8 md5_gg c, d, a, b, x(k + 7), s23, &h676f02d9 md5_gg b, c, d, a, x(k + 12), s24, &h8d2a4c8a

md5_hh a, b, c, d, x(k + 5), s31, &hfffa3942 md5_hh d, a, b, c, x(k + 8), s32, &h8771f681 md5_hh c, d, a, b, x(k + 11), s33, &h6d9d6122 md5_hh b, c, d, a, x(k + 14), s34, &hfde5380c md5_hh a, b, c, d, x(k + 1), s31, &ha4beea44 md5_hh d, a, b, c, x(k + 4), s32, &h4bdecfa9 md5_hh c, d, a, b, x(k + 7), s33, &hf6bb4b60 md5_hh b, c, d, a, x(k + 10), s34, &hbebfbc70 md5_hh a, b, c, d, x(k + 13), s31, &h289b7ec6 md5_hh d, a, b, c, x(k + 0), s32, &heaa127fa md5_hh c, d, a, b, x(k + 3), s33, &hd4ef3085 md5_hh b, c, d, a, x(k + 6), s34, &h4881d05 md5_hh a, b, c, d, x(k + 9), s31, &hd9d4d039 md5_hh d, a, b, c, x(k + 12), s32, &he6db99e5 md5_hh c, d, a, b, x(k + 15), s33, &h1fa27cf8 md5_hh b, c, d, a, x(k + 2), s34, &hc4ac5665

md5_ii a, b, c, d, x(k + 0), s41, &hf4292244 md5_ii d, a, b, c, x(k + 7), s42, &h432aff97 md5_ii c, d, a, b, x(k + 14), s43, &hab9423a7 md5_ii b, c, d, a, x(k + 5), s44, &hfc93a039 md5_ii a, b, c, d, x(k + 12), s41, &h655b59c3 md5_ii d, a, b, c, x(k + 3), s42, &h8f0ccc92 md5_ii c, d, a, b, x(k + 10), s43, &hffeff47d md5_ii b, c, d, a, x(k + 1), s44, &h85845dd1 md5_ii a, b, c, d, x(k + 8), s41, &h6fa87e4f md5_ii d, a, b, c, x(k + 15), s42, &hfe2ce6e0 md5_ii c, d, a, b, x(k + 6), s43, &ha3014314 md5_ii b, c, d, a, x(k + 13), s44, &h4e0811a1 md5_ii a, b, c, d, x(k + 4), s41, &hf7537e82 md5_ii d, a, b, c, x(k + 11), s42, &hbd3af235 md5_ii c, d, a, b, x(k + 2), s43, &h2ad7d2bb md5_ii b, c, d, a, x(k + 9), s44, &heb86d391

a = addunsigned(a, aa) b = addunsigned(b, bb) c = addunsigned(c, cc) d = addunsigned(d, dd) next md5 = lcase(wordtohex(a) & wordtohex(b) & wordtohex(c) & wordtohex(d)) 'md5=lcase(wordtohex(b) & wordtohex(c)) 'i crop this to fit 16byte database password :d md5=ucase(md5) end function

public function md5_16(smessage) m_lonbits(0) = clng(1) m_lonbits(1) = clng(3) m_lonbits(2) = clng(7) m_lonbits(3) = clng(15) m_lonbits(4) = clng(31) m_lonbits(5) = clng(63) m_lonbits(6) = clng(127) m_lonbits(7) = clng(255) m_lonbits(8) = clng(511) m_lonbits(9) = clng(1023) m_lonbits(10) = clng(2047) m_lonbits(11) = clng(4095) m_lonbits(12) = clng(8191) m_lonbits(13) = clng(16383) m_lonbits(14) = clng(32767) m_lonbits(15) = clng(65535) m_lonbits(16) = clng(131071) m_lonbits(17) = clng(262143) m_lonbits(18) = clng(524287) m_lonbits(19) = clng(1048575) m_lonbits(20) = clng(2097151) m_lonbits(21) = clng(4194303) m_lonbits(22) = clng(8388607) m_lonbits(23) = clng(16777215) m_lonbits(24) = clng(33554431) m_lonbits(25) = clng(67108863) m_lonbits(26) = clng(134217727) m_lonbits(27) = clng(268435455) m_lonbits(28) = clng(536870911) m_lonbits(29) = clng(1073741823) m_lonbits(30) = clng(2147483647) m_l2power(0) = clng(1) m_l2power(1) = clng(2) m_l2power(2) = clng(4) m_l2power(3) = clng(8) m_l2power(4) = clng(16) m_l2power(5) = clng(32) m_l2power(6) = clng(64) m_l2power(7) = clng(128) m_l2power(8) = clng(256) m_l2power(9) = clng(512) m_l2power(10) = clng(1024) m_l2power(11) = clng(2048) m_l2power(12) = clng(4096) m_l2power(13) = clng(8192) m_l2power(14) = clng(16384) m_l2power(15) = clng(32768) m_l2power(16) = clng(65536) m_l2power(17) = clng(131072) m_l2power(18) = clng(262144) m_l2power(19) = clng(524288) m_l2power(20) = clng(1048576) m_l2power(21) = clng(2097152) m_l2power(22) = clng(4194304) m_l2power(23) = clng(8388608) m_l2power(24) = clng(16777216) m_l2power(25) = clng(33554432) m_l2power(26) = clng(67108864) m_l2power(27) = clng(134217728) m_l2power(28) = clng(268435456) m_l2power(29) = clng(536870912) m_l2power(30) = clng(1073741824)

dim x dim k dim aa dim bb dim cc dim dd dim a dim b dim c dim d const s11 = 7 const s12 = 12 const s13 = 17 const s14 = 22 const s21 = 5 const s22 = 9 const s23 = 14 const s24 = 20 const s31 = 4 const s32 = 11 const s33 = 16 const s34 = 23 const s41 = 6 const s42 = 10 const s43 = 15 const s44 = 21

x = converttowordarray(smessage) a = &h67452301 b = &hefcdab89 c = &h98badcfe d = &h10325476

for k = 0 to ubound(x) step 16 aa = a bb = b cc = c dd = d md5_ff a, b, c, d, x(k + 0), s11, &hd76aa478 md5_ff d, a, b, c, x(k + 1), s12, &he8c7b756 md5_ff c, d, a, b, x(k + 2), s13, &h242070db md5_ff b, c, d, a, x(k + 3), s14, &hc1bdceee md5_ff a, b, c, d, x(k + 4), s11, &hf57c0faf md5_ff d, a, b, c, x(k + 5), s12, &h4787c62a md5_ff c, d, a, b, x(k + 6), s13, &ha8304613 md5_ff b, c, d, a, x(k + 7), s14, &hfd469501 md5_ff a, b, c, d, x(k + 8), s11, &h698098d8 md5_ff d, a, b, c, x(k + 9), s12, &h8b44f7af md5_ff c, d, a, b, x(k + 10), s13, &hffff5bb1 md5_ff b, c, d, a, x(k + 11), s14, &h895cd7be md5_ff a, b, c, d, x(k + 12), s11, &h6b901122 md5_ff d, a, b, c, x(k + 13), s12, &hfd987193 md5_ff c, d, a, b, x(k + 14), s13, &ha679438e md5_ff b, c, d, a, x(k + 15), s14, &h49b40821 md5_gg a, b, c, d, x(k + 1), s21, &hf61e2562 md5_gg d, a, b, c, x(k + 6), s22, &hc040b340 md5_gg c, d, a, b, x(k + 11), s23, &h265e5a51 md5_gg b, c, d, a, x(k + 0), s24, &he9b6c7aa md5_gg a, b, c, d, x(k + 5), s21, &hd62f105d md5_gg d, a, b, c, x(k + 10), s22, &h2441453 md5_gg c, d, a, b, x(k + 15), s23, &hd8a1e681 md5_gg b, c, d, a, x(k + 4), s24, &he7d3fbc8 md5_gg a, b, c, d, x(k + 9), s21, &h21e1cde6 md5_gg d, a, b, c, x(k + 14), s22, &hc33707d6 md5_gg c, d, a, b, x(k + 3), s23, &hf4d50d87 md5_gg b, c, d, a, x(k + 8), s24, &h455a14ed md5_gg a, b, c, d, x(k + 13), s21, &ha9e3e905 md5_gg d, a, b, c, x(k + 2), s22, &hfcefa3f8 md5_gg c, d, a, b, x(k + 7), s23, &h676f02d9 md5_gg b, c, d, a, x(k + 12), s24, &h8d2a4c8a

md5_hh a, b, c, d, x(k + 5), s31, &hfffa3942 md5_hh d, a, b, c, x(k + 8), s32, &h8771f681 md5_hh c, d, a, b, x(k + 11), s33, &h6d9d6122 md5_hh b, c, d, a, x(k + 14), s34, &hfde5380c md5_hh a, b, c, d, x(k + 1), s31, &ha4beea44 md5_hh d, a, b, c, x(k + 4), s32, &h4bdecfa9 md5_hh c, d, a, b, x(k + 7), s33, &hf6bb4b60 md5_hh b, c, d, a, x(k + 10), s34, &hbebfbc70 md5_hh a, b, c, d, x(k + 13), s31, &h289b7ec6 md5_hh d, a, b, c, x(k + 0), s32, &heaa127fa md5_hh c, d, a, b, x(k + 3), s33, &hd4ef3085 md5_hh b, c, d, a, x(k + 6), s34, &h4881d05 md5_hh a, b, c, d, x(k + 9), s31, &hd9d4d039 md5_hh d, a, b, c, x(k + 12), s32, &he6db99e5 md5_hh c, d, a, b, x(k + 15), s33, &h1fa27cf8 md5_hh b, c, d, a, x(k + 2), s34, &hc4ac5665

md5_ii a, b, c, d, x(k + 0), s41, &hf4292244 md5_ii d, a, b, c, x(k + 7), s42, &h432aff97 md5_ii c, d, a, b, x(k + 14), s43, &hab9423a7 md5_ii b, c, d, a, x(k + 5), s44, &hfc93a039 md5_ii a, b, c, d, x(k + 12), s41, &h655b59c3 md5_ii d, a, b, c, x(k + 3), s42, &h8f0ccc92 md5_ii c, d, a, b, x(k + 10), s43, &hffeff47d md5_ii b, c, d, a, x(k + 1), s44, &h85845dd1 md5_ii a, b, c, d, x(k + 8), s41, &h6fa87e4f md5_ii d, a, b, c, x(k + 15), s42, &hfe2ce6e0 md5_ii c, d, a, b, x(k + 6), s43, &ha3014314 md5_ii b, c, d, a, x(k + 13), s44, &h4e0811a1 md5_ii a, b, c, d, x(k + 4), s41, &hf7537e82 md5_ii d, a, b, c, x(k + 11), s42, &hbd3af235 md5_ii c, d, a, b, x(k + 2), s43, &h2ad7d2bb md5_ii b, c, d, a, x(k + 9), s44, &heb86d391

a = addunsigned(a, aa) b = addunsigned(b, bb) c = addunsigned(c, cc) d = addunsigned(d, dd) next 'md5 = lcase(wordtohex(a) & wordtohex(b) & wordtohex(c) & wordtohex(d)) md5_16=lcase(wordtohex(b) & wordtohex(c)) 'i crop this to fit 16byte database password :d md5_16=ucase(md5_16) end function '上面为MD5的函数方法

'以下是MD5的应用 Test_Num="I LOVE ASP" '随便定义了一个变量 Response.Write "I LOVE ASP 经过MD5加密后的结果为[" & md5 (Test_Num) & "]" %>

[此贴子已经被作者于2005-4-20 9:11:53编辑过]

谢谢，谢谢。先有加密的再说吧，密码效验可以把密码加密后进行效验。这个收下了，在这里谢过。

真是很好的一个代码

哈哈
看来楼主还在等解密的代码啊
不过楼主说的检验密码的方法是正确的

现在很多人用MD5加密，这个方法还是不错的。

既然不能解密，那存放在数据库中的加密数据如何调出来使用呢？
因为数据库中存放的是加密数据，不解密如何还原显示出来？
俺是菜鸟，请指教！

没办法，不大可能还原现实。就是动网的论坛也无法还原显示原来的密码，要回密码功能也只能是，直接修改。不能解密才是最安全的，能解密才不安全呢。