md5.c File Reference

Calculation of MD5 digest as defined in RFC 1321. More...

#include "md5.h"
#include <string.h>
#include "mhd_bithelpers.h"
#include "mhd_assert.h"

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Macros
#define	F_FUNC(x, y, z)
#define	G_FUNC_1(x, y, z)
#define	G_FUNC_2(x, y, z)
#define	H_FUNC(x, y, z)
#define	I_FUNC(x, y, z)
#define	MD5STEP_R1(va, vb, vc, vd, vX, vs, vT)
#define	GET_X_FROM_DATA(buf, t)
#define	MD5STEP_R2(va, vb, vc, vd, vX, vs, vT)
#define	MD5STEP_R3(va, vb, vc, vd, vX, vs, vT)
#define	MD5STEP_R4(va, vb, vc, vd, vX, vs, vT)
#define	MD5_SIZE_OF_LEN_ADD_BITS   64
#define	MD5_SIZE_OF_LEN_ADD   (MD5_SIZE_OF_LEN_ADD_BITS / 8)

Functions
void	MHD_MD5_init (struct Md5Ctx *ctx)
static MHD_DATA_TRUNCATION_RUNTIME_CHECK_DISABLE_ void	md5_transform (uint32_t H[MD5_HASH_SIZE_WORDS], const void *M)
void	MHD_MD5_update (struct Md5Ctx *ctx, const uint8_t *data, size_t length)
void	MHD_MD5_finish (struct Md5Ctx *ctx, uint8_t digest[MD5_DIGEST_SIZE])

Detailed Description

Calculation of MD5 digest as defined in RFC 1321.

Author

Karlson2k (Evgeny Grin)

Definition in file md5.c.

Macro Definition Documentation

F_FUNC

#define F_FUNC	(		x,
			y,
			z )

Value:

((((y) ^ (z)) & (x)) ^ (z))

G_FUNC_1

#define G_FUNC_1	(		x,
			y,
			z )

Value:

((~(z)) & (y))

G_FUNC_2

#define G_FUNC_2	(		x,
			y,
			z )

Value:

((z) & (x))

GET_X_FROM_DATA

#define GET_X_FROM_DATA	(		buf,
			t )

Value:

_MHD_GET_32BIT_LE (((const uint32_t*) (buf)) + (t))

Referenced by md5_transform().

H_FUNC

#define H_FUNC	(		x,
			y,
			z )

Value:

((x) ^ (y) ^ (z)) /* Original version */

I_FUNC

#define I_FUNC	(		x,
			y,
			z )

Value:

(((~(z)) | (x)) ^ (y))

MD5_SIZE_OF_LEN_ADD

#define MD5_SIZE_OF_LEN_ADD   (MD5_SIZE_OF_LEN_ADD_BITS / 8)

Size of "length" insertion in bytes.

Definition at line 452 of file md5.c.

Referenced by MHD_MD5_finish().

MD5_SIZE_OF_LEN_ADD_BITS

#define MD5_SIZE_OF_LEN_ADD_BITS   64

Size of "length" insertion in bits. See RFC 1321, end of Clause 3.2 (step 2).

Definition at line 447 of file md5.c.

MD5STEP_R1

#define MD5STEP_R1	(		va,
			vb,
			vc,
			vd,
			vX,
			vs,
			vT )

Value:

do {          \
(va) += (vX) + (vT);                               \
(va) += F_FUNC((vb),(vc),(vd));                    \
(va) = _MHD_ROTL32((va),(vs)) + (vb); } while (0)

Referenced by md5_transform().

MD5STEP_R2

#define MD5STEP_R2	(		va,
			vb,
			vc,
			vd,
			vX,
			vs,
			vT )

Value:

do {         \
(va) += (vX) + (vT);                              \
(va) += G_FUNC_1((vb),(vc),(vd));                 \
(va) += G_FUNC_2((vb),(vc),(vd));                 \
(va) = _MHD_ROTL32((va),(vs)) + (vb); } while (0)

Referenced by md5_transform().

MD5STEP_R3

#define MD5STEP_R3	(		va,
			vb,
			vc,
			vd,
			vX,
			vs,
			vT )

Value:

do {         \
(va) += (vX) + (vT);                              \
(va) += H_FUNC((vb),(vc),(vd));                   \
(va) = _MHD_ROTL32((va),(vs)) + (vb); } while (0)

Referenced by md5_transform().

MD5STEP_R4

#define MD5STEP_R4	(		va,
			vb,
			vc,
			vd,
			vX,
			vs,
			vT )

Value:

do {         \
(va) += (vX) + (vT);                              \
(va) += I_FUNC((vb),(vc),(vd));                   \
(va) = _MHD_ROTL32((va),(vs)) + (vb); } while (0)

Referenced by md5_transform().

Function Documentation

md5_transform()

MHD_DATA_TRUNCATION_RUNTIME_CHECK_DISABLE_ void md5_transform ( uint32_t H[MD5_HASH_SIZE_WORDS], const void * M )

static

Base of MD5 transformation. Gets full 64 bytes block of data and updates hash values;

Parameters

H	hash values
M	the data buffer with MD5_BLOCK_SIZE bytes block

Definition at line 66 of file md5.c.

References _MHD_UINT32_ALIGN, GET_X_FROM_DATA, MD5_HASH_SIZE_WORDS, MD5STEP_R1, MD5STEP_R2, MD5STEP_R3, and MD5STEP_R4.

Referenced by MHD_MD5_finish(), and MHD_MD5_update().

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MHD_MD5_finish()

void MHD_MD5_finish	(	struct Md5Ctx *	ctx,
		uint8_t	digest[MD5_DIGEST_SIZE] )

Finalise MD5 calculation, return digest.

Parameters

	ctx	the calculation context
[out]	digest	set to the hash, must be MD5_DIGEST_SIZE bytes

< Number of processed bits

< Number of bytes in the context buffer

Definition at line 461 of file md5.c.

References _MHD_PUT_32BIT_LE, _MHD_PUT_64BIT_LE_SAFE(), _MHD_UINT32_ALIGN, Md5Ctx::buffer, Md5Ctx::count, Md5Ctx::H, MD5_BLOCK_SIZE, MD5_BLOCK_SIZE_WORDS, MD5_BYTES_IN_WORD, MD5_DIGEST_SIZE, MD5_DIGEST_SIZE_WORDS, MD5_SIZE_OF_LEN_ADD, and md5_transform().

Referenced by digest_calc_hash().

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MHD_MD5_init()

void MHD_MD5_init

(

struct Md5Ctx *

ctx

)

Initialise structure for MD5 calculation.

Parameters

ctx	the calculation context

Definition at line 41 of file md5.c.

References Md5Ctx::count, and Md5Ctx::H.

MHD_MD5_update()

void MHD_MD5_update	(	struct Md5Ctx *	ctx,
		const uint8_t *	data,
		size_t	length )

Process portion of bytes.

Parameters

ctx	the calculation context
data	bytes to add to hash
length	number of bytes in data

MD5 process portion of bytes.

Parameters

ctx	the calculation context
data	bytes to add to hash
length	number of bytes in data

< Number of bytes in the context buffer

Definition at line 393 of file md5.c.

References Md5Ctx::buffer, Md5Ctx::count, data, Md5Ctx::H, MD5_BLOCK_SIZE, md5_transform(), mhd_assert, and NULL.

Referenced by digest_update().

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