mdfour.c File Reference

#include "shared/shared.h"
#include "common/mdfour.h"

Go to the source code of this file.

Macros
#define	F(X, Y, Z)   (((X)&(Y)) | ((~(X))&(Z)))
#define	G(X, Y, Z)   (((X)&(Y)) | ((X)&(Z)) | ((Y)&(Z)))
#define	H(X, Y, Z)   ((X)^(Y)^(Z))
#define	lshift(x, s)   (((x)<<(s)) | ((x)>>(32-(s))))
#define	ROUND1(a, b, c, d, k, s)   a = lshift(a + F(b,c,d) + X[k], s)
#define	ROUND2(a, b, c, d, k, s)   a = lshift(a + G(b,c,d) + X[k] + 0x5A827999,s)
#define	ROUND3(a, b, c, d, k, s)   a = lshift(a + H(b,c,d) + X[k] + 0x6ED9EBA1,s)

Functions
static void	mdfour64 (uint32_t *M)
static void	copy64 (uint32_t *M, uint8_t *in)
static void	copy4 (uint8_t *out, uint32_t x)
void	mdfour_begin (struct mdfour *md)
static void	mdfour_tail (uint8_t *in, size_t n)
void	mdfour_update (struct mdfour *md, uint8_t *in, size_t n)
void	mdfour_result (struct mdfour *md, uint8_t *out)
uint32_t	Com_BlockChecksum (void *buffer, size_t len)

Variables
static struct mdfour *	m

Macro Definition Documentation

F

#define F	(		X,
			Y,
			Z
	)		(((X)&(Y)) | ((~(X))&(Z)))

Definition at line 34 of file mdfour.c.

G

#define G	(		X,
			Y,
			Z
	)		(((X)&(Y)) | ((X)&(Z)) | ((Y)&(Z)))

Definition at line 35 of file mdfour.c.

H

#define H	(		X,
			Y,
			Z
	)		((X)^(Y)^(Z))

Definition at line 36 of file mdfour.c.

lshift

#define lshift	(		x,
			s
	)		(((x)<<(s)) | ((x)>>(32-(s))))

Definition at line 40 of file mdfour.c.

ROUND1

#define ROUND1	(		a,
			b,
			c,
			d,
			k,
			s
	)		a = lshift(a + F(b,c,d) + X[k], s)

Definition at line 43 of file mdfour.c.

ROUND2

#define ROUND2	(		a,
			b,
			c,
			d,
			k,
			s
	)		a = lshift(a + G(b,c,d) + X[k] + 0x5A827999,s)

Definition at line 44 of file mdfour.c.

ROUND3

#define ROUND3	(		a,
			b,
			c,
			d,
			k,
			s
	)		a = lshift(a + H(b,c,d) + X[k] + 0x6ED9EBA1,s)

Definition at line 45 of file mdfour.c.

Function Documentation

Com_BlockChecksum()

uint32_t Com_BlockChecksum	(	void *	buffer,
		size_t	len
	)

Definition at line 187 of file mdfour.c.

{
    uint32_t digest[4];
    uint32_t val;
    struct mdfour md;
 
    mdfour_begin(&md);
    mdfour_update(&md, (uint8_t *)buffer, len);
    mdfour_result(&md, (uint8_t *)digest);
 
    val = digest[0] ^ digest[1] ^ digest[2] ^ digest[3];
 
    return val;
}

Referenced by BSP_Load().

copy4()

static void copy4 ( uint8_t *  out, uint32_t  x  )

static

Definition at line 110 of file mdfour.c.

{
    out[0] = x & 0xFF;
    out[1] = (x >> 8) & 0xFF;
    out[2] = (x >> 16) & 0xFF;
    out[3] = (x >> 24) & 0xFF;
}

Referenced by mdfour_result(), and mdfour_tail().

copy64()

static void copy64 ( uint32_t *  M, uint8_t *  in  )

static

Definition at line 101 of file mdfour.c.

{
    int i;
 
    for (i = 0; i < 16; i++)
        M[i] = (in[i * 4 + 3] << 24) | (in[i * 4 + 2] << 16) |
               (in[i * 4 + 1] << 8) | (in[i * 4 + 0] << 0);
}

Referenced by mdfour_tail(), and mdfour_update().

mdfour64()

static void mdfour64 ( uint32_t *  M )

static

Definition at line 48 of file mdfour.c.

{
    int j;
    uint32_t AA, BB, CC, DD;
    uint32_t X[16];
    uint32_t A, B, C, D;
 
    for (j = 0; j < 16; j++)
        X[j] = M[j];
 
    A = m->A; B = m->B; C = m->C; D = m->D;
    AA = A; BB = B; CC = C; DD = D;
 
    ROUND1(A, B, C, D,  0,  3);  ROUND1(D, A, B, C,  1,  7);
    ROUND1(C, D, A, B,  2, 11);  ROUND1(B, C, D, A,  3, 19);
    ROUND1(A, B, C, D,  4,  3);  ROUND1(D, A, B, C,  5,  7);
    ROUND1(C, D, A, B,  6, 11);  ROUND1(B, C, D, A,  7, 19);
    ROUND1(A, B, C, D,  8,  3);  ROUND1(D, A, B, C,  9,  7);
    ROUND1(C, D, A, B, 10, 11);  ROUND1(B, C, D, A, 11, 19);
    ROUND1(A, B, C, D, 12,  3);  ROUND1(D, A, B, C, 13,  7);
    ROUND1(C, D, A, B, 14, 11);  ROUND1(B, C, D, A, 15, 19);
 
    ROUND2(A, B, C, D,  0,  3);  ROUND2(D, A, B, C,  4,  5);
    ROUND2(C, D, A, B,  8,  9);  ROUND2(B, C, D, A, 12, 13);
    ROUND2(A, B, C, D,  1,  3);  ROUND2(D, A, B, C,  5,  5);
    ROUND2(C, D, A, B,  9,  9);  ROUND2(B, C, D, A, 13, 13);
    ROUND2(A, B, C, D,  2,  3);  ROUND2(D, A, B, C,  6,  5);
    ROUND2(C, D, A, B, 10,  9);  ROUND2(B, C, D, A, 14, 13);
    ROUND2(A, B, C, D,  3,  3);  ROUND2(D, A, B, C,  7,  5);
    ROUND2(C, D, A, B, 11,  9);  ROUND2(B, C, D, A, 15, 13);
 
    ROUND3(A, B, C, D,  0,  3);  ROUND3(D, A, B, C,  8,  9);
    ROUND3(C, D, A, B,  4, 11);  ROUND3(B, C, D, A, 12, 15);
    ROUND3(A, B, C, D,  2,  3);  ROUND3(D, A, B, C, 10,  9);
    ROUND3(C, D, A, B,  6, 11);  ROUND3(B, C, D, A, 14, 15);
    ROUND3(A, B, C, D,  1,  3);  ROUND3(D, A, B, C,  9,  9);
    ROUND3(C, D, A, B,  5, 11);  ROUND3(B, C, D, A, 13, 15);
    ROUND3(A, B, C, D,  3,  3);  ROUND3(D, A, B, C, 11,  9);
    ROUND3(C, D, A, B,  7, 11);  ROUND3(B, C, D, A, 15, 15);
 
    A += AA; B += BB; C += CC; D += DD;
 
#ifdef LARGE_INT32
    A &= 0xFFFFFFFF; B &= 0xFFFFFFFF;
    C &= 0xFFFFFFFF; D &= 0xFFFFFFFF;
#endif
 
    for (j = 0; j < 16; j++)
        X[j] = 0;
 
    m->A = A; m->B = B; m->C = C; m->D = D;
}

Referenced by mdfour_tail(), and mdfour_update().

mdfour_begin()

void mdfour_begin

(

struct mdfour *

md

)

Definition at line 118 of file mdfour.c.

{
    md->A = 0x67452301;
    md->B = 0xefcdab89;
    md->C = 0x98badcfe;
    md->D = 0x10325476;
    md->totalN = 0;
}

Referenced by CalcHash(), and Com_BlockChecksum().

mdfour_result()

void mdfour_result	(	struct mdfour *	md,
		uint8_t *	out
	)

Definition at line 175 of file mdfour.c.

{
    m = md;
 
    copy4(out, m->A);
    copy4(out + 4, m->B);
    copy4(out + 8, m->C);
    copy4(out + 12, m->D);
}

Referenced by CalcHash(), and Com_BlockChecksum().

mdfour_tail()

static void mdfour_tail ( uint8_t *  in, size_t  n  )

static

Definition at line 128 of file mdfour.c.

{
    uint8_t buf[128];
    uint32_t M[16];
    uint32_t b;
 
    m->totalN += n;
 
    b = m->totalN * 8;
 
    memset(buf, 0, 128);
    if (n) memcpy(buf, in, n);
    buf[n] = 0x80;
 
    if (n <= 55) {
        copy4(buf + 56, b);
        copy64(M, buf);
        mdfour64(M);
    } else {
        copy4(buf + 120, b);
        copy64(M, buf);
        mdfour64(M);
        copy64(M, buf + 64);
        mdfour64(M);
    }
}

Referenced by mdfour_update().

mdfour_update()

void mdfour_update	(	struct mdfour *	md,
		uint8_t *	in,
		size_t	n
	)

Definition at line 155 of file mdfour.c.

{
    uint32_t M[16];
 
    m = md;
 
    if (n == 0) mdfour_tail(in, n);
 
    while (n >= 64) {
        copy64(M, in);
        mdfour64(M);
        in += 64;
        n -= 64;
        m->totalN += 64;
    }
 
    mdfour_tail(in, n);
}

Referenced by CalcHash(), and Com_BlockChecksum().

Variable Documentation

m

struct mdfour* m

static

Definition at line 32 of file mdfour.c.

Referenced by Cmd_Macro_g(), inverse(), mdfour64(), mdfour_result(), mdfour_tail(), mdfour_update(), Menu_AdjustCursor(), Menu_DefaultKey(), Menu_ItemAtCursor(), Prompt_CompleteHistory(), R_BeginRegistration_RTX(), R_CreateNotexture(), resolve_masters(), sample_polygonal_lights(), setup_color(), StringToFilter(), SV_FilterPacket(), SV_ListMasters_f(), SV_MasterHeartbeat(), SV_MasterShutdown(), SV_SetMaster_f(), SVC_Ack(), and vkpt_vertex_buffer_upload_models_to_staging().