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()

static 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, 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

< 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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