hash_md5.c File Reference

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include "BLI_hash_md5.h"

Go to the source code of this file.

Classes
struct	md5_ctx

Macros
#define	UINT_MAX_32_BITS   0xFFFFFFFF
#define	UINT_MAX   UINT_MAX_32_BITS
#define	SWAP(n)   (n)
#define	FF(b, c, d)   (d ^ (b & (c ^ d)))
#define	FG(b, c, d)   FF(d, b, c)
#define	FH(b, c, d)   (b ^ c ^ d)
#define	FI(b, c, d)   (c ^ (b | ~d))
#define	CYCLIC(w, s)   (w = (w << s) | (w >> (32 - s)))
#define	OP(a, b, c, d, s, T)
#define	OP(f, a, b, c, d, k, s, T)
#define	BLOCKSIZE   4096 /* Important: must be a multiple of 64. */

Typedefs
typedef unsigned int	md5_uint32

Functions
static void	md5_init_ctx (struct md5_ctx *ctx)
static void	md5_process_block (const void *buffer, size_t len, struct md5_ctx *ctx)
static void *	md5_read_ctx (const struct md5_ctx *ctx, void *resbuf)
int	BLI_hash_md5_stream (FILE *stream, void *resblock)
void *	BLI_hash_md5_buffer (const char *buffer, size_t len, void *resblock)
char *	BLI_hash_md5_to_hexdigest (void *resblock, char r_hex_digest[33])

Variables
static const unsigned char	fillbuf [64] = {0x80, 0 }

Detailed Description

Functions to compute MD5 message digest of files or memory blocks according to the definition of MD5 in RFC 1321 from April 1992.

Definition in file hash_md5.c.

Macro Definition Documentation

BLOCKSIZE

#define BLOCKSIZE   4096 /* Important: must be a multiple of 64. */

CYCLIC

#define CYCLIC	(		w,
			s
	)		(w = (w << s) | (w >> (32 - s)))

FF

#define FF	(		b,
			c,
			d
	)		(d ^ (b & (c ^ d)))

FG

#define FG	(		b,
			c,
			d
	)		FF(d, b, c)

FH

#define FH	(		b,
			c,
			d
	)		(b ^ c ^ d)

FI

#define FI	(		b,
			c,
			d
	)		(c ^ (b | ~d))

OP [1/2]

#define OP	(		a,
			b,
			c,
			d,
			s,
			T
	)

Value:

  a += FF(b, c, d) + (*cwp++ = SWAP(*words)) + T; \
  words++; \
  CYCLIC(a, s); \
  a += b; \
  (void)0

OP [2/2]

#define OP	(		f,
			a,
			b,
			c,
			d,
			k,
			s,
			T
	)

Value:

  a += f(b, c, d) + correct_words[k] + T; \
  CYCLIC(a, s); \
  a += b; \
  (void)0

SWAP

#define SWAP

(

n

)

(n)

Definition at line 90 of file hash_md5.c.

UINT_MAX

#define UINT_MAX   UINT_MAX_32_BITS

Definition at line 58 of file hash_md5.c.

UINT_MAX_32_BITS

#define UINT_MAX_32_BITS   0xFFFFFFFF

Definition at line 48 of file hash_md5.c.

Typedef Documentation

md5_uint32

typedef unsigned int md5_uint32

Definition at line 62 of file hash_md5.c.

Function Documentation

BLI_hash_md5_buffer()

void* BLI_hash_md5_buffer	(	const char *	buffer,
		size_t	len,
		void *	resblock
	)

Compute MD5 message digest for 'len' bytes beginning at 'buffer'. The result is always in little endian byte order, so that a byte-wise output yields to the wanted ASCII representation of the message digest.

Definition at line 370 of file hash_md5.c.

References buffer, fillbuf, len, md5_init_ctx(), md5_process_block(), md5_read_ctx(), and SWAP.

Referenced by IMB_thumb_load_font_get_hash(), render_result_exr_file_cache_path(), and thumbpathname_from_uri().

BLI_hash_md5_stream()

int BLI_hash_md5_stream	(	FILE *	stream,
		void *	resblock
	)

Compute MD5 message digest for bytes read from 'stream'. The resulting message digest number will be written into the 16 bytes beginning at 'resblock'.

Returns

Non-zero if an error occurred.

Definition at line 292 of file hash_md5.c.

References BLOCKSIZE, buffer, fillbuf, len, md5_init_ctx(), md5_process_block(), md5_read_ctx(), sum(), and SWAP.

BLI_hash_md5_to_hexdigest()

char* BLI_hash_md5_to_hexdigest	(	void *	resblock,
		char	r_hex_digest[33]
	)

Definition at line 406 of file hash_md5.c.

References Freestyle::c, and len.

Referenced by IMB_thumb_load_font_get_hash(), render_result_exr_file_cache_path(), and thumbpathname_from_uri().

md5_init_ctx()

static void md5_init_ctx ( struct md5_ctx *  ctx )

static

Initialize structure containing state of computation. (RFC 1321, 3.3: Step 3)

Definition at line 101 of file hash_md5.c.

References md5_ctx::A, md5_ctx::B, md5_ctx::C, and md5_ctx::D.

Referenced by BLI_hash_md5_buffer(), and BLI_hash_md5_stream().

md5_process_block()

static void md5_process_block ( const void *  buffer, size_t  len, struct md5_ctx *  ctx  )

static

Starting with the result of former calls of this function (or the initialization), this function updates the 'ctx' context for the next 'len' bytes starting at 'buffer'. It is necessary that 'len' is a multiple of 64!!!

Definition at line 114 of file hash_md5.c.

References A, md5_ctx::A, B, md5_ctx::B, buffer, md5_ctx::C, C, md5_ctx::D, D(), FG, FH, FI, len, and OP.

Referenced by BLI_hash_md5_buffer(), and BLI_hash_md5_stream().

md5_read_ctx()

static void* md5_read_ctx ( const struct md5_ctx *  ctx, void *  resbuf  )

static

Put result from 'ctx' in first 16 bytes of 'resbuf'. The result is always in little endian byte order, so that a byte-wise output yields to the wanted ASCII representation of the message digest.

Definition at line 274 of file hash_md5.c.

References md5_ctx::A, md5_ctx::B, md5_ctx::C, md5_ctx::D, and SWAP.

Referenced by BLI_hash_md5_buffer(), and BLI_hash_md5_stream().

Variable Documentation

fillbuf

const unsigned char fillbuf[64] = {0x80, 0 }

static

Definition at line 95 of file hash_md5.c.

Referenced by BLI_hash_md5_buffer(), and BLI_hash_md5_stream().