md5.c File Reference

#include "md5.h"
#include "util.h"

Include dependency graph for md5.c:

Go to the source code of this file.

Macros
#define	F1(x, y, z)   (z ^ (x & (y ^ z)))
#define	F2(x, y, z)   F1( z, x, y )
#define	F3(x, y, z)   (x ^ y ^ z)
#define	F4(x, y, z)   (y ^ (x | ~z))
#define	MD5STEP(f, w, x, y, z, data, s)    ( w += f( x, y, z ) + data, w = w << s | w >> (32 - s), w += x )

Functions
static void	MD5Transform (unsigned int buf[4], const unsigned int in[16])
VOID NTAPI	MD5Init (MD5_CTX *ctx)
VOID NTAPI	MD5Update (MD5_CTX *ctx, const unsigned char *buf, unsigned int len)
VOID NTAPI	MD5Final (MD5_CTX *ctx)

Macro Definition Documentation

F1

#define F1	(		x,
			y,
			z
	)		(z ^ (x & (y ^ z)))

Definition at line 161 of file md5.c.

F2

#define F2	(		x,
			y,
			z
	)		F1( z, x, y )

Definition at line 162 of file md5.c.

F3

#define F3	(		x,
			y,
			z
	)		(x ^ y ^ z)

Definition at line 163 of file md5.c.

F4

#define F4	(		x,
			y,
			z
	)		(y ^ (x | ~z))

Definition at line 164 of file md5.c.

MD5STEP

#define MD5STEP	(		f,
			w,
			x,
			y,
			z,
			data,
			s
	)		( w += f( x, y, z ) + data, w = w << s | w >> (32 - s), w += x )

Definition at line 167 of file md5.c.

Function Documentation

MD5Final()

VOID NTAPI MD5Final

(

MD5_CTX *

ctx

)

Definition at line 113 of file md5.c.

{
    unsigned int count;
    unsigned char *p;
 
    /* Compute number of bytes mod 64 */
    count = (ctx->i[0] >> 3) & 0x3F;
 
    /* Set the first char of padding to 0x80.  This is safe since there is
       always at least one byte free */
    p = ctx->in + count;
    *p++ = 0x80;
 
    /* Bytes of padding needed to make 64 bytes */
    count = 64 - 1 - count;
 
    /* Pad out to 56 mod 64 */
    if (count < 8)
    {
        /* Two lots of padding:  Pad the first block to 64 bytes */
        memset( p, 0, count );
        byteReverse( ctx->in, 16 );
        MD5Transform( ctx->buf, (unsigned int *)ctx->in );
 
        /* Now fill the next block with 56 bytes */
        memset( ctx->in, 0, 56 );
    }
    else
    {
        /* Pad block to 56 bytes */
        memset( p, 0, count - 8 );
    }
 
    byteReverse( ctx->in, 14 );
 
    /* Append length in bits and transform */
    ((unsigned int *)ctx->in)[14] = ctx->i[0];
    ((unsigned int *)ctx->in)[15] = ctx->i[1];
 
    MD5Transform( ctx->buf, (unsigned int *)ctx->in );
    byteReverse( (unsigned char *)ctx->buf, 4 );
    memcpy( ctx->digest, ctx->buf, 16 );
    memset(ctx->in, 0, sizeof(ctx->in));
}

Referenced by finalize_hash_impl(), and SECUR32_CalcNTLM2Subkey().

MD5Init()

VOID NTAPI MD5Init

(

MD5_CTX *

ctx

)

Definition at line 45 of file md5.c.

{
    ctx->buf[0] = 0x67452301;
    ctx->buf[1] = 0xefcdab89;
    ctx->buf[2] = 0x98badcfe;
    ctx->buf[3] = 0x10325476;
 
    ctx->i[0] = ctx->i[1] = 0;
}

Referenced by init_hash_impl(), and SECUR32_CalcNTLM2Subkey().

MD5Transform()

static void MD5Transform ( unsigned int  buf[4], const unsigned int  in[16]  )

static

Definition at line 175 of file md5.c.

{
    register unsigned int a, b, c, d;
 
    a = buf[0];
    b = buf[1];
    c = buf[2];
    d = buf[3];
 
    MD5STEP( F1, a, b, c, d, in[0] + 0xd76aa478, 7 );
    MD5STEP( F1, d, a, b, c, in[1] + 0xe8c7b756, 12 );
    MD5STEP( F1, c, d, a, b, in[2] + 0x242070db, 17 );
    MD5STEP( F1, b, c, d, a, in[3] + 0xc1bdceee, 22 );
    MD5STEP( F1, a, b, c, d, in[4] + 0xf57c0faf, 7 );
    MD5STEP( F1, d, a, b, c, in[5] + 0x4787c62a, 12 );
    MD5STEP( F1, c, d, a, b, in[6] + 0xa8304613, 17 );
    MD5STEP( F1, b, c, d, a, in[7] + 0xfd469501, 22 );
    MD5STEP( F1, a, b, c, d, in[8] + 0x698098d8, 7 );
    MD5STEP( F1, d, a, b, c, in[9] + 0x8b44f7af, 12 );
    MD5STEP( F1, c, d, a, b, in[10] + 0xffff5bb1, 17 );
    MD5STEP( F1, b, c, d, a, in[11] + 0x895cd7be, 22 );
    MD5STEP( F1, a, b, c, d, in[12] + 0x6b901122, 7 );
    MD5STEP( F1, d, a, b, c, in[13] + 0xfd987193, 12 );
    MD5STEP( F1, c, d, a, b, in[14] + 0xa679438e, 17 );
    MD5STEP( F1, b, c, d, a, in[15] + 0x49b40821, 22 );
 
    MD5STEP( F2, a, b, c, d, in[1] + 0xf61e2562, 5 );
    MD5STEP( F2, d, a, b, c, in[6] + 0xc040b340, 9 );
    MD5STEP( F2, c, d, a, b, in[11] + 0x265e5a51, 14 );
    MD5STEP( F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20 );
    MD5STEP( F2, a, b, c, d, in[5] + 0xd62f105d, 5 );
    MD5STEP( F2, d, a, b, c, in[10] + 0x02441453, 9 );
    MD5STEP( F2, c, d, a, b, in[15] + 0xd8a1e681, 14 );
    MD5STEP( F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20 );
    MD5STEP( F2, a, b, c, d, in[9] + 0x21e1cde6, 5 );
    MD5STEP( F2, d, a, b, c, in[14] + 0xc33707d6, 9 );
    MD5STEP( F2, c, d, a, b, in[3] + 0xf4d50d87, 14 );
    MD5STEP( F2, b, c, d, a, in[8] + 0x455a14ed, 20 );
    MD5STEP( F2, a, b, c, d, in[13] + 0xa9e3e905, 5 );
    MD5STEP( F2, d, a, b, c, in[2] + 0xfcefa3f8, 9 );
    MD5STEP( F2, c, d, a, b, in[7] + 0x676f02d9, 14 );
    MD5STEP( F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20 );
 
    MD5STEP( F3, a, b, c, d, in[5] + 0xfffa3942, 4 );
    MD5STEP( F3, d, a, b, c, in[8] + 0x8771f681, 11 );
    MD5STEP( F3, c, d, a, b, in[11] + 0x6d9d6122, 16 );
    MD5STEP( F3, b, c, d, a, in[14] + 0xfde5380c, 23 );
    MD5STEP( F3, a, b, c, d, in[1] + 0xa4beea44, 4 );
    MD5STEP( F3, d, a, b, c, in[4] + 0x4bdecfa9, 11 );
    MD5STEP( F3, c, d, a, b, in[7] + 0xf6bb4b60, 16 );
    MD5STEP( F3, b, c, d, a, in[10] + 0xbebfbc70, 23 );
    MD5STEP( F3, a, b, c, d, in[13] + 0x289b7ec6, 4 );
    MD5STEP( F3, d, a, b, c, in[0] + 0xeaa127fa, 11 );
    MD5STEP( F3, c, d, a, b, in[3] + 0xd4ef3085, 16 );
    MD5STEP( F3, b, c, d, a, in[6] + 0x04881d05, 23 );
    MD5STEP( F3, a, b, c, d, in[9] + 0xd9d4d039, 4 );
    MD5STEP( F3, d, a, b, c, in[12] + 0xe6db99e5, 11 );
    MD5STEP( F3, c, d, a, b, in[15] + 0x1fa27cf8, 16 );
    MD5STEP( F3, b, c, d, a, in[2] + 0xc4ac5665, 23 );
 
    MD5STEP( F4, a, b, c, d, in[0] + 0xf4292244, 6 );
    MD5STEP( F4, d, a, b, c, in[7] + 0x432aff97, 10 );
    MD5STEP( F4, c, d, a, b, in[14] + 0xab9423a7, 15 );
    MD5STEP( F4, b, c, d, a, in[5] + 0xfc93a039, 21 );
    MD5STEP( F4, a, b, c, d, in[12] + 0x655b59c3, 6 );
    MD5STEP( F4, d, a, b, c, in[3] + 0x8f0ccc92, 10 );
    MD5STEP( F4, c, d, a, b, in[10] + 0xffeff47d, 15 );
    MD5STEP( F4, b, c, d, a, in[1] + 0x85845dd1, 21 );
    MD5STEP( F4, a, b, c, d, in[8] + 0x6fa87e4f, 6 );
    MD5STEP( F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10 );
    MD5STEP( F4, c, d, a, b, in[6] + 0xa3014314, 15 );
    MD5STEP( F4, b, c, d, a, in[13] + 0x4e0811a1, 21 );
    MD5STEP( F4, a, b, c, d, in[4] + 0xf7537e82, 6 );
    MD5STEP( F4, d, a, b, c, in[11] + 0xbd3af235, 10 );
    MD5STEP( F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15 );
    MD5STEP( F4, b, c, d, a, in[9] + 0xeb86d391, 21 );
 
    buf[0] += a;
    buf[1] += b;
    buf[2] += c;
    buf[3] += d;
}

Referenced by MD5Final(), and MD5Update().

MD5Update()

VOID NTAPI MD5Update	(	MD5_CTX *	ctx,
		const unsigned char *	buf,
		unsigned int	len
	)

Definition at line 59 of file md5.c.

{
    register unsigned int t;
 
    /* Update bitcount */
    t = ctx->i[0];
 
    if ((ctx->i[0] = t + (len << 3)) < t)
        ctx->i[1]++;        /* Carry from low to high */
 
    ctx->i[1] += len >> 29;
    t = (t >> 3) & 0x3f;
 
    /* Handle any leading odd-sized chunks */
    if (t)
    {
        unsigned char *p = (unsigned char *)ctx->in + t;
        t = 64 - t;
 
        if (len < t)
        {
            memcpy( p, buf, len );
            return;
        }
 
        memcpy( p, buf, t );
        byteReverse( ctx->in, 16 );
 
        MD5Transform( ctx->buf, (unsigned int *)ctx->in );
 
        buf += t;
        len -= t;
    }
 
    /* Process data in 64-byte chunks */
    while (len >= 64)
    {
        memcpy( ctx->in, buf, 64 );
        byteReverse( ctx->in, 16 );
 
        MD5Transform( ctx->buf, (unsigned int *)ctx->in );
 
        buf += 64;
        len -= 64;
    }
 
    /* Handle any remaining bytes of data. */
    memcpy( ctx->in, buf, len );
}

Referenced by SECUR32_CalcNTLM2Subkey(), and update_hash_impl().