md4.h File Reference

#include <ntdef.h>

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Classes
struct	MD4_CTX

Functions
VOID NTAPI	MD4Init (MD4_CTX *ctx)
VOID NTAPI	MD4Update (MD4_CTX *ctx, const unsigned char *buf, unsigned int len)
VOID NTAPI	MD4Final (MD4_CTX *ctx)

Function Documentation

MD4Final()

VOID NTAPI MD4Final

(

MD4_CTX *

ctx

)

Definition at line 113 of file md4.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 );
        MD4Transform( 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];

    MD4Transform( ctx->buf, (unsigned int *)ctx->in );
    byteReverse( (unsigned char *)ctx->buf, 4 );
    memcpy( ctx->digest, ctx->buf, 16 );
}

MD4Init()

VOID NTAPI MD4Init

(

MD4_CTX *

ctx

)

Definition at line 45 of file md4.c.

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

    ctx->i[0] = ctx->i[1] = 0;
}

MD4Update()

VOID NTAPI MD4Update	(	MD4_CTX *	ctx,
		const unsigned char *	buf,
		unsigned int	len
	)

Definition at line 59 of file md4.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 );

        MD4Transform( 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 );

        MD4Transform( ctx->buf, (unsigned int *)ctx->in );

        buf += 64;
        len -= 64;
    }

    /* Handle any remaining bytes of data. */
    memcpy( ctx->in, buf, len );
}