移植问题PHP的crypt（）函数的C＃ [英] Problem porting PHP crypt() function to C#
问题描述
林工作移植一些旧 ALP 用户帐户到一个新的ASP.Net解决方案，我想为用户能够使用他们的旧密码。
Im working on porting some old ALP user accounts to a new ASP.Net solution, and I would like for the users to be able to use their old passwords.
然而，为了使这种工作，我需要能够到老哈希比作新计算值的基础上，新键入密码。
However, in order for that to work, I need to be able to compare the old hashes to a newly calculated one, based on a newly typed password.
我，四处搜寻，发现的这个为（） <$ C $执行C>地穴由PHP名为：
I searched around, and found this as the implementation of crypt() called by PHP:
char *
crypt_md5(const char *pw, const char *salt)
{
MD5_CTX ctx,ctx1;
unsigned long l;
int sl, pl;
u_int i;
u_char final[MD5_SIZE];
static const char *sp, *ep;
static char passwd[120], *p;
static const char *magic = "$1$";
/* Refine the Salt first */
sp = salt;
/* If it starts with the magic string, then skip that */
if(!strncmp(sp, magic, strlen(magic)))
sp += strlen(magic);
/* It stops at the first '$', max 8 chars */
for(ep = sp; *ep && *ep != '$' && ep < (sp + 8); ep++)
continue;
/* get the length of the true salt */
sl = ep - sp;
MD5Init(&ctx);
/* The password first, since that is what is most unknown */
MD5Update(&ctx, (const u_char *)pw, strlen(pw));
/* Then our magic string */
MD5Update(&ctx, (const u_char *)magic, strlen(magic));
/* Then the raw salt */
MD5Update(&ctx, (const u_char *)sp, (u_int)sl);
/* Then just as many characters of the MD5(pw,salt,pw) */
MD5Init(&ctx1);
MD5Update(&ctx1, (const u_char *)pw, strlen(pw));
MD5Update(&ctx1, (const u_char *)sp, (u_int)sl);
MD5Update(&ctx1, (const u_char *)pw, strlen(pw));
MD5Final(final, &ctx1);
for(pl = (int)strlen(pw); pl > 0; pl -= MD5_SIZE)
MD5Update(&ctx, (const u_char *)final,
(u_int)(pl > MD5_SIZE ? MD5_SIZE : pl));
/* Don't leave anything around in vm they could use. */
memset(final, 0, sizeof(final));
/* Then something really weird... */
for (i = strlen(pw); i; i >>= 1)
if(i & 1)
MD5Update(&ctx, (const u_char *)final, 1);
else
MD5Update(&ctx, (const u_char *)pw, 1);
/* Now make the output string */
strcpy(passwd, magic);
strncat(passwd, sp, (u_int)sl);
strcat(passwd, "$");
MD5Final(final, &ctx);
/*
* and now, just to make sure things don't run too fast
* On a 60 Mhz Pentium this takes 34 msec, so you would
* need 30 seconds to build a 1000 entry dictionary...
*/
for(i = 0; i < 1000; i++) {
MD5Init(&ctx1);
if(i & 1)
MD5Update(&ctx1, (const u_char *)pw, strlen(pw));
else
MD5Update(&ctx1, (const u_char *)final, MD5_SIZE);
if(i % 3)
MD5Update(&ctx1, (const u_char *)sp, (u_int)sl);
if(i % 7)
MD5Update(&ctx1, (const u_char *)pw, strlen(pw));
if(i & 1)
MD5Update(&ctx1, (const u_char *)final, MD5_SIZE);
else
MD5Update(&ctx1, (const u_char *)pw, strlen(pw));
MD5Final(final, &ctx1);
}
p = passwd + strlen(passwd);
l = (final[ 0]<<16) | (final[ 6]<<8) | final[12];
_crypt_to64(p, l, 4); p += 4;
l = (final[ 1]<<16) | (final[ 7]<<8) | final[13];
_crypt_to64(p, l, 4); p += 4;
l = (final[ 2]<<16) | (final[ 8]<<8) | final[14];
_crypt_to64(p, l, 4); p += 4;
l = (final[ 3]<<16) | (final[ 9]<<8) | final[15];
_crypt_to64(p, l, 4); p += 4;
l = (final[ 4]<<16) | (final[10]<<8) | final[ 5];
_crypt_to64(p, l, 4); p += 4;
l = final[11];
_crypt_to64(p, l, 2); p += 2;
*p = '\0';
/* Don't leave anything around in vm they could use. */
memset(final, 0, sizeof(final));
return (passwd);
}
和，这是我在C＃中的版本，与预期的匹配一起。
And, here is my version in C#, along with an expected match.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Diagnostics;
using System.Security.Cryptography;
using System.IO;
using System.Management;
namespace Test
{
class Program
{
static void Main(string[] args)
{
byte[] salt = Encoding.ASCII.GetBytes("$1$ls3xPLpO$Wu/FQ.PtP2XBCqrM.w847/");
Console.WriteLine("Hash: " + Encoding.ASCII.GetString(salt));
byte[] passkey = Encoding.ASCII.GetBytes("suckit");
byte[] newhash = md5_crypt(passkey, salt);
Console.WriteLine("Hash2: " + Encoding.ASCII.GetString(newhash));
byte[] newhash2 = md5_crypt(passkey, newhash);
Console.WriteLine("Hash3: " + Encoding.ASCII.GetString(newhash2));
Console.ReadKey(true);
}
public static byte[] md5_crypt(byte[] pw, byte[] salt)
{
MemoryStream ctx, ctx1;
ulong l;
int sl, pl;
int i;
byte[] final;
int sp, ep; //** changed pointers to array indices
MemoryStream passwd = new MemoryStream();
byte[] magic = Encoding.ASCII.GetBytes("$1$");
// Refine the salt first
sp = 0; //** Changed to an array index, rather than a pointer.
// If it starts with the magic string, then skip that
if (salt[0] == magic[0] &&
salt[1] == magic[1] &&
salt[2] == magic[2])
{
sp += magic.Length;
}
// It stops at the first '$', max 8 chars
for (ep = sp;
(ep + sp < salt.Length) && //** Converted to array indices, and rather than check for null termination, check for the end of the array.
salt[ep] != (byte)'$' &&
ep < (sp + 8);
ep++)
continue;
// Get the length of the true salt
sl = ep - sp;
ctx = MD5Init();
// The password first, since that is what is most unknown
MD5Update(ctx, pw, pw.Length);
// Then our magic string
MD5Update(ctx, magic, magic.Length);
// Then the raw salt
MD5Update(ctx, salt, sp, sl);
// Then just as many characters of the MD5(pw,salt,pw)
ctx1 = MD5Init();
MD5Update(ctx1, pw, pw.Length);
MD5Update(ctx1, salt, sp, sl);
MD5Update(ctx1, pw, pw.Length);
final = MD5Final(ctx1);
for(pl = pw.Length; pl > 0; pl -= final.Length)
MD5Update(ctx, final,
(pl > final.Length ? final.Length : pl));
// Don't leave anything around in vm they could use.
for (i = 0; i < final.Length; i++) final[i] = 0;
// Then something really weird...
for (i = pw.Length; i != 0; i >>= 1)
if((i & 1) != 0)
MD5Update(ctx, final, 1);
else
MD5Update(ctx, pw, 1);
// Now make the output string
passwd.Write(magic, 0, magic.Length);
passwd.Write(salt, sp, sl);
passwd.WriteByte((byte)'$');
final = MD5Final(ctx);
// and now, just to make sure things don't run too fast
// On a 60 Mhz Pentium this takes 34 msec, so you would
// need 30 seconds to build a 1000 entry dictionary...
for(i = 0; i < 1000; i++)
{
ctx1 = MD5Init();
if((i & 1) != 0)
MD5Update(ctx1, pw, pw.Length);
else
MD5Update(ctx1, final, final.Length);
if((i % 3) != 0)
MD5Update(ctx1, salt, sp, sl);
if((i % 7) != 0)
MD5Update(ctx1, pw, pw.Length);
if((i & 1) != 0)
MD5Update(ctx1, final, final.Length);
else
MD5Update(ctx1, pw, pw.Length);
final = MD5Final(ctx1);
}
//** Section changed to use a memory stream, rather than a byte array.
l = (((ulong)final[0]) << 16) | (((ulong)final[6]) << 8) | ((ulong)final[12]);
_crypt_to64(passwd, l, 4);
l = (((ulong)final[1]) << 16) | (((ulong)final[7]) << 8) | ((ulong)final[13]);
_crypt_to64(passwd, l, 4);
l = (((ulong)final[2]) << 16) | (((ulong)final[8]) << 8) | ((ulong)final[14]);
_crypt_to64(passwd, l, 4);
l = (((ulong)final[3]) << 16) | (((ulong)final[9]) << 8) | ((ulong)final[15]);
_crypt_to64(passwd, l, 4);
l = (((ulong)final[4]) << 16) | (((ulong)final[10]) << 8) | ((ulong)final[5]);
_crypt_to64(passwd, l, 4);
l = final[11];
_crypt_to64(passwd, l, 2);
byte[] buffer = new byte[passwd.Length];
passwd.Seek(0, SeekOrigin.Begin);
passwd.Read(buffer, 0, buffer.Length);
return buffer;
}
public static MemoryStream MD5Init()
{
return new MemoryStream();
}
public static void MD5Update(MemoryStream context, byte[] source, int length)
{
context.Write(source, 0, length);
}
public static void MD5Update(MemoryStream context, byte[] source, int offset, int length)
{
context.Write(source, offset, length);
}
public static byte[] MD5Final(MemoryStream context)
{
long location = context.Position;
byte[] buffer = new byte[context.Length];
context.Seek(0, SeekOrigin.Begin);
context.Read(buffer, 0, (int)context.Length);
context.Seek(location, SeekOrigin.Begin);
return MD5.Create().ComputeHash(buffer);
}
// Changed to use a memory stream rather than a character array.
public static void _crypt_to64(MemoryStream s, ulong v, int n)
{
char[] _crypt_a64 = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz".ToCharArray();
while (--n >= 0)
{
s.WriteByte((byte)_crypt_a64[v & 0x3f]);
v >>= 6;
}
}
}
}
我究竟做错了什么？我正在了解中的FreeBSD版本的MD5xxxx功能运作一些大的假设，但它似乎工作。
What Am I doing wrong? I am making some big assumptions about the workings of the MD5xxxx functions in the FreeBSD version, but it seems to work.
所使用的PHP这不是实际的版本？ ？有没有人有任何见解
Is this not the actual version used by PHP? Does anyone have any insight?
编辑：
我下载的副本PHP的源代码，并发现它使用glibc库。所以，我下载的glibc的源代码的副本，发现__md5_crypt_r功能，复制它的功能，蚂蚁它带回来完全相同的哈希作为的FreeBSD版本。
I downloaded a copy of PHP's source code, and found that it uses the glibc library. So, I downloaded a copy of glibc's source code, found the __md5_crypt_r function, duplicated its functionality, ant it came back with the EXACT same hashes as the FreeBSD version.
现在，我非常难住了。难道PHP 4比使用PHP 5不同的方法？ ？这是怎么回事
Now, I am pretty much stumped. Did PHP 4 use a different method than PHP 5? What is going on?
推荐答案
好吧，所以这里是答案：
Alright, so here is the answer:
PHP使用的的glibc 的实施地穴功能。 （附：C＃实现）
PHP uses the glibc implementation of the crypt function. (attached: C# implementation)
我的旧密码不匹配哈希的原因是因为在Linux中我的旧网站（GoDaddy代管）坐在了一个非标准的哈希算法。 （可能是为了解决一些在算法做了奇怪的东西。）
The reason my old passwords are not matching the hash is because the Linux box my old website (hosted by GoDaddy) sat on had a non-standard hashing algorithm. (Possibly to fix some of the WEIRD stuff done in the algorithm.)
不过，我测试的是glibc的单元测试下面的执行情况，并针对Windows安装PHP的。 。这两项测试都通过了100％
However, I have tested the following implementation against glibc's unit tests and against a windows install of PHP. Both tests were passed 100%.
修改
这里是链接：（移动到Github的GIST）
EDIT
Here is the link: (moved to a Github Gist)
HTTPS：//gist.github。 COM / 1092558
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