checksum.c File Reference

#include "vkd3d_shader_private.h"

Include dependency graph for checksum.c:

Go to the source code of this file.

Classes
struct	md5_ctx

Macros
#define	DXBC_CHECKSUM_BLOCK_SIZE   64
#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_ASSERT (sizeof(unsigned int)==4)
static void	md5_transform (unsigned int buf[4], const unsigned int in[16])
static void	byte_reverse (unsigned char *buf, unsigned longs)
static void	md5_init (struct md5_ctx *ctx)
static void	md5_update (struct md5_ctx *ctx, const unsigned char *buf, unsigned int len)
static void	md5_final (struct md5_ctx *ctx, enum vkd3d_md5_variant variant)
void	vkd3d_compute_md5 (const void *data, size_t size, uint32_t checksum[4], enum vkd3d_md5_variant variant)

Macro Definition Documentation

DXBC_CHECKSUM_BLOCK_SIZE

#define DXBC_CHECKSUM_BLOCK_SIZE   64

Definition at line 43 of file checksum.c.

F1

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

Definition at line 58 of file checksum.c.

F2

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

Definition at line 59 of file checksum.c.

F3

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

Definition at line 60 of file checksum.c.

F4

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

Definition at line 61 of file checksum.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 64 of file checksum.c.

Function Documentation

byte_reverse()

static void byte_reverse ( unsigned char *  buf, unsigned  longs  )

static

Definition at line 158 of file checksum.c.

{
    unsigned int t;
 
    do
    {
        t = vkd3d_make_u32(vkd3d_make_u16(buf[0], buf[1]), vkd3d_make_u16(buf[2], buf[3]));
        *(unsigned int *)buf = t;
        buf += 4;
    } while (--longs);
}

Referenced by md5_final(), and md5_update().

md5_final()

static void md5_final ( struct md5_ctx *  ctx, enum vkd3d_md5_variant  variant  )

static

Definition at line 238 of file checksum.c.

{
    unsigned int padding;
    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;
    ++count;
 
    /* Bytes of padding needed to make 64 bytes */
    padding = DXBC_CHECKSUM_BLOCK_SIZE - count;
 
    /* Pad out to 56 mod 64 */
    if (padding < 8)
    {
        /* Two lots of padding:  Pad the first block to 64 bytes */
        memset(p, 0, padding);
        byte_reverse(ctx->in, 16);
        md5_transform(ctx->buf, (unsigned int *)ctx->in);
 
        /* Now fill the next block */
        memset(ctx->in, 0, DXBC_CHECKSUM_BLOCK_SIZE);
    }
    else if (variant == VKD3D_MD5_DXBC)
    {
        /* Make place for bitcount at the beginning of the block */
        memmove(&ctx->in[4], ctx->in, count);
 
        /* Pad block to 60 bytes */
        memset(p + 4, 0, padding - 4);
    }
    else
    {
        /* Pad block to 56 bytes */
        memset(p, 0, padding - 8);
    }
 
    /* Append length in bits and transform */
    if (variant == VKD3D_MD5_DXBC)
    {
        unsigned int length;
 
        length = ctx->i[0];
        memcpy(&ctx->in[0], &length, sizeof(length));
        byte_reverse(&ctx->in[4], 14);
        length = ctx->i[0] >> 2 | 0x1;
        memcpy(&ctx->in[DXBC_CHECKSUM_BLOCK_SIZE - 4], &length, sizeof(length));
    }
    else
    {
        byte_reverse(ctx->in, 14);
 
        ((unsigned int *)ctx->in)[14] = ctx->i[0];
        ((unsigned int *)ctx->in)[15] = ctx->i[1];
    }
 
    md5_transform(ctx->buf, (unsigned int *)ctx->in);
    byte_reverse((unsigned char *)ctx->buf, 4);
    memcpy(ctx->digest, ctx->buf, 16);
}

Referenced by rdssl_sign_ok(), and vkd3d_compute_md5().

md5_init()

static void md5_init ( struct md5_ctx *  ctx )

static

Definition at line 174 of file checksum.c.

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

md5_transform()

static void md5_transform ( unsigned int  buf[4], const unsigned int  in[16]  )

static

Definition at line 72 of file checksum.c.

{
    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 md5_final(), and md5_update().

md5_update()

static void md5_update ( struct md5_ctx *  ctx, const unsigned char *  buf, unsigned int  len  )

static

Definition at line 188 of file checksum.c.

{
    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 = DXBC_CHECKSUM_BLOCK_SIZE - t;
 
        if (len < t)
        {
            memcpy(p, buf, len);
            return;
        }
 
        memcpy(p, buf, t);
        byte_reverse(ctx->in, 16);
 
        md5_transform(ctx->buf, (unsigned int *)ctx->in);
 
        buf += t;
        len -= t;
    }
 
    /* Process data in 64-byte chunks */
    while (len >= DXBC_CHECKSUM_BLOCK_SIZE)
    {
        memcpy(ctx->in, buf, DXBC_CHECKSUM_BLOCK_SIZE);
        byte_reverse(ctx->in, 16);
 
        md5_transform(ctx->buf, (unsigned int *)ctx->in);
 
        buf += DXBC_CHECKSUM_BLOCK_SIZE;
        len -= DXBC_CHECKSUM_BLOCK_SIZE;
    }
 
    /* Handle any remaining bytes of data. */
    memcpy(ctx->in, buf, len);
}

STATIC_ASSERT()

STATIC_ASSERT

(

sizeof(unsigned int)

= =4

)

vkd3d_compute_md5()

void vkd3d_compute_md5	(	const void *	data,
		size_t	size,
		uint32_t	checksum[4],
		enum vkd3d_md5_variant	variant
	)

Definition at line 305 of file checksum.c.

{
    const uint8_t *ptr = data;
    struct md5_ctx ctx;
 
    md5_init(&ctx);
    md5_update(&ctx, ptr, size);
    md5_final(&ctx, variant);
 
    memcpy(checksum, ctx.digest, sizeof(ctx.digest));
}

Referenced by compute_dxbc_checksum(), and fill_shader_dump_data().