md4.c File Reference

MD4 algorithm. More...

#include <stdint.h>
#include <assert.h>
#include <ipxe/rotate.h>
#include <ipxe/crypto.h>
#include <ipxe/md4.h>

Go to the source code of this file.

Data Structures
struct	md4_variables
	MD4 variables. More...
struct	md4_step
	An MD4 step function. More...

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
	FILE_SECBOOT (PERMITTED)
static uint32_t	md4_f_0_15 (struct md4_variables *v, unsigned int i)
	f(b,c,d,w) for steps 0 to 15
static uint32_t	md4_f_16_31 (struct md4_variables *v, unsigned int i)
	f(b,c,d,w) for steps 16 to 31
static uint32_t	md4_f_32_47 (struct md4_variables *v, unsigned int i)
	f(b,c,d,w) for steps 32 to 47
static void	md4_compress (struct md4_digest_data *dd, const struct md4_digest *digest)
	Calculate MD4 digest of accumulated data.
	MDHASH_ALGORITHM (md4, md4_algorithm, md4_compress, __LITTLE_ENDIAN, struct md4_digest_data, md4_init, MD4_DIGEST_SIZE)
	MD4 algorithm.

Variables
static const uint8_t	r [3][4]
	MD4 shift amounts.
static const struct md4_step	md4_steps [4]
	MD4 steps.
static const struct md4_digest	md4_init
	MD4 initial digest values.

Detailed Description

MD4 algorithm.

Definition in file md4.c.

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER_OR_UBDL

)

FILE_SECBOOT()

FILE_SECBOOT

(

PERMITTED

)

md4_f_0_15()

uint32_t md4_f_0_15 ( struct md4_variables * v, unsigned int i )

static

f(b,c,d,w) for steps 0 to 15

Parameters

v	MD4 variables
i	Index within round

Return values

f	f(b,c,d,w)

Definition at line 63 of file md4.c.

                                                                       {
        return ( ( ( v->b & v->c ) | ( ~v->b & v->d ) ) + v->w[i] );
}

References md4_variables::b, md4_variables::c, md4_variables::d, and md4_variables::w.

md4_f_16_31()

uint32_t md4_f_16_31 ( struct md4_variables * v, unsigned int i )

static

f(b,c,d,w) for steps 16 to 31

Parameters

v	MD4 variables
i	Index within round

Return values

f	f(b,c,d,w)

Definition at line 74 of file md4.c.

                                                                        {
        return ( ( ( v->b & v->c ) | ( v->b & v->d ) | ( v->c & v->d ) ) +
                 v->w[ ( ( i << 2 ) | ( i >> 2 ) ) % 16 ] );
}

References md4_variables::b, md4_variables::c, md4_variables::d, and md4_variables::w.

md4_f_32_47()

uint32_t md4_f_32_47 ( struct md4_variables * v, unsigned int i )

static

f(b,c,d,w) for steps 32 to 47

Parameters

v	MD4 variables
i	Index within round

Return values

f	f(b,c,d,w)

Definition at line 86 of file md4.c.

                                                                        {
        static const uint8_t reverse[16] = {
                0, 8, 4, 12, 2, 10, 6, 14, 1, 9, 5, 13, 3, 11, 7, 15
        };
        return ( ( v->b ^ v->c ^ v->d ) + v->w[reverse[i]] );
}

References md4_variables::b, md4_variables::c, md4_variables::d, and md4_variables::w.

md4_compress()

void md4_compress ( struct md4_digest_data * dd, const struct md4_digest * digest )

static

Calculate MD4 digest of accumulated data.

Parameters

dd	Digest and data block
digest	Copy of current digest value

Definition at line 128 of file md4.c.

                                                             {
        union {
                struct md4_digest_data dd;
                struct md4_variables v;
        } *u = container_of ( dd, typeof ( *u ), dd );
        struct md4_variables *v = &u->v;
        const struct md4_step *step;
        uint32_t *a = &v->a;
        uint32_t *b = &v->b;
        uint32_t *c = &v->c;
        uint32_t *d = &v->d;
        uint32_t *w = v->w;
        uint32_t f;
        uint32_t temp;
        unsigned int round;
        unsigned int i;
 
        /* Sanity checks */
        build_assert ( &u->dd.digest.h[0] == a );
        build_assert ( &u->dd.digest.h[1] == b );
        build_assert ( &u->dd.digest.h[2] == c );
        build_assert ( &u->dd.digest.h[3] == d );
        build_assert ( &u->dd.data.dword[0] == w );
        build_assert ( sizeof ( u->dd ) == sizeof ( u->v ) );
 
        /* Main loop */
        for ( i = 0 ; i < 48 ; i++ ) {
                round = ( i / 16 );
                step = &md4_steps[round];
                f = step->f ( v, ( i % 16 ) );
                temp = *d;
                *d = *c;
                *c = *b;
                *b = rol32 ( ( *a + f + step->constant ), r[round][ i % 4 ] );
                *a = temp;
                DBGC2 ( &md4_algorithm, "%2d : %08x %08x %08x %08x\n",
                        i, *a, *b, *c, *d );
        }
 
        /* Add chunk to hash */
        for ( i = 0 ; i < 4 ; i++ )
                dd->digest.h[i] += digest->h[i];
}

References md4_variables::a, md4_variables::b, build_assert, md4_variables::c, container_of, md4_variables::d, DBGC2, md4_digest_data::digest, md4_step::f, md4_digest::h, md4_algorithm, md4_steps, r, rol32(), step(), typeof(), u, and md4_variables::w.

Referenced by MDHASH_ALGORITHM().

MDHASH_ALGORITHM()

MDHASH_ALGORITHM	(	md4	,
		md4_algorithm	,
		md4_compress	,
		__LITTLE_ENDIAN	,
		struct md4_digest_data	,
		md4_init	,
		MD4_DIGEST_SIZE	)

MD4 algorithm.

References __LITTLE_ENDIAN, md4_algorithm, md4_compress(), MD4_DIGEST_SIZE, and md4_init.

Variable Documentation

r

const uint8_t r[3][4]

static

Initial value:

                       = {
        {  3,  7, 11, 19 },
        {  3,  5,  9, 13 },
        {  3,  9, 11, 15 },
}

MD4 shift amounts.

Definition at line 50 of file md4.c.

                             {
        {  3,  7, 11, 19 },
        {  3,  5,  9, 13 },
        {  3,  9, 11, 15 },
};

Referenced by __ath9k_hw_init(), __attribute__(), af_packet_nic_poll(), ar5008_write_rf_array(), ath9k_hw_channel_change(), ath9k_hw_reset(), ath9k_hw_write_array(), ath9k_start(), ath_radio_disable(), ath_reset(), ath_set_channel(), bcom_phy_init(), ecdsa_alloc(), ecdsa_sign_rs(), ecdsa_verify_rs(), fls(), genesis_mac_init(), gma_write16(), gma_write16(), md4_compress(), md5_compress(), tap_poll(), xm_write16(), and xm_write32().

md4_steps

const struct md4_step md4_steps[4]

static

Initial value:

                            = {
        
        { .f = md4_f_0_15,      .constant = 0x00000000UL },
        
        { .f = md4_f_16_31,     .constant = 0x5a827999UL },
        
        { .f = md4_f_32_47,     .constant = 0x6ed9eba1UL },
}

MD4 steps.

Definition at line 108 of file md4.c.

                                          {
        /** 0 to 15 */
        { .f = md4_f_0_15,      .constant = 0x00000000UL },
        /** 16 to 31 */
        { .f = md4_f_16_31,     .constant = 0x5a827999UL },
        /** 32 to 47 */
        { .f = md4_f_32_47,     .constant = 0x6ed9eba1UL },
};

Referenced by md4_compress().

md4_init

const struct md4_digest md4_init

static

Initial value:

                             = {
        .h = { 0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476 }
}

MD4 initial digest values.

Definition at line 118 of file md4.c.

                                        {
        .h = { 0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476 }
};

Referenced by MDHASH_ALGORITHM().