iPXE
Data Structures | Functions | Variables
md4.c File Reference

MD4 algorithm. More...

#include <stdint.h>
#include <string.h>
#include <byteswap.h>
#include <assert.h>
#include <ipxe/rotate.h>
#include <ipxe/crypto.h>
#include <ipxe/asn1.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)
 
static uint32_t md4_f_0_15 (struct md4_variables *v, unsigned int i)
 f(b,c,d,w) for steps 0 to 15 More...
 
static uint32_t md4_f_16_31 (struct md4_variables *v, unsigned int i)
 f(b,c,d,w) for steps 16 to 31 More...
 
static uint32_t md4_f_32_47 (struct md4_variables *v, unsigned int i)
 f(b,c,d,w) for steps 32 to 47 More...
 
static void md4_init (void *ctx)
 Initialise MD4 algorithm. More...
 
static void md4_digest (struct md4_context *context)
 Calculate MD4 digest of accumulated data. More...
 
static void md4_update (void *ctx, const void *data, size_t len)
 Accumulate data with MD4 algorithm. More...
 
static void md4_final (void *ctx, void *out)
 Generate MD4 digest. More...
 

Variables

struct md4_variables __attribute__
 
static const uint8_t r [3][4]
 MD4 shift amounts. More...
 
static struct md4_step md4_steps [4]
 MD4 steps. More...
 
struct digest_algorithm md4_algorithm
 MD4 algorithm. More...
 
static uint8_t oid_md4 [] = { ASN1_OID_MD4 }
 "md4" object identifier More...
 
struct asn1_algorithm oid_md4_algorithm __asn1_algorithm
 "md4" OID-identified algorithm More...
 

Detailed Description

MD4 algorithm.

Definition in file md4.c.

Function Documentation

◆ FILE_LICENCE()

FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL  )

◆ md4_f_0_15()

static 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
vMD4 variables
iIndex within round
Return values
ff(b,c,d,w)

Definition at line 67 of file md4.c.

67  {
68  return ( ( ( v->b & v->c ) | ( ~v->b & v->d ) ) + v->w[i] );
69 }
uint32_t d
Definition: md4.c:49
uint32_t c
Definition: md4.c:48
uint32_t w[16]
Definition: md4.c:50
uint32_t b
Definition: md4.c:47

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

◆ md4_f_16_31()

static 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
vMD4 variables
iIndex within round
Return values
ff(b,c,d,w)

Definition at line 78 of file md4.c.

78  {
79  return ( ( ( v->b & v->c ) | ( v->b & v->d ) | ( v->c & v->d ) ) +
80  v->w[ ( ( i << 2 ) | ( i >> 2 ) ) % 16 ] );
81 }
uint32_t d
Definition: md4.c:49
uint32_t c
Definition: md4.c:48
uint32_t w[16]
Definition: md4.c:50
uint32_t b
Definition: md4.c:47

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

◆ md4_f_32_47()

static 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
vMD4 variables
iIndex within round
Return values
ff(b,c,d,w)

Definition at line 90 of file md4.c.

90  {
91  static const uint8_t reverse[16] = {
92  0, 8, 4, 12, 2, 10, 6, 14, 1, 9, 5, 13, 3, 11, 7, 15
93  };
94  return ( ( v->b ^ v->c ^ v->d ) + v->w[reverse[i]] );
95 }
uint32_t d
Definition: md4.c:49
uint32_t c
Definition: md4.c:48
uint32_t w[16]
Definition: md4.c:50
uint32_t b
Definition: md4.c:47
unsigned char uint8_t
Definition: stdint.h:10

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

◆ md4_init()

static void md4_init ( void *  ctx)
static

Initialise MD4 algorithm.

Parameters
ctxMD4 context

Definition at line 126 of file md4.c.

126  {
127  struct md4_context *context = ctx;
128 
129  context->ddd.dd.digest.h[0] = cpu_to_le32 ( 0x67452301 );
130  context->ddd.dd.digest.h[1] = cpu_to_le32 ( 0xefcdab89 );
131  context->ddd.dd.digest.h[2] = cpu_to_le32 ( 0x98badcfe );
132  context->ddd.dd.digest.h[3] = cpu_to_le32 ( 0x10325476 );
133  context->len = 0;
134 }
struct md4_digest_data dd
Digest and data block.
Definition: md4.h:51
struct golan_eq_context ctx
Definition: CIB_PRM.h:28
uint32_t h[4]
Hash output.
Definition: md4.h:18
size_t len
Amount of accumulated data.
Definition: md4.h:60
#define cpu_to_le32(value)
Definition: byteswap.h:107
An MD4 context.
Definition: md4.h:58
union md4_digest_data_dwords ddd
Digest and accumulated data.
Definition: md4.h:62
struct md4_digest digest
Digest of data already processed.
Definition: md4.h:43

References cpu_to_le32, ctx, md4_digest_data_dwords::dd, md4_context::ddd, md4_digest_data::digest, md4_digest::h, and md4_context::len.

◆ md4_digest()

static void md4_digest ( struct md4_context context)
static

Calculate MD4 digest of accumulated data.

Parameters
contextMD4 context

Definition at line 141 of file md4.c.

141  {
142  union {
144  struct md4_variables v;
145  } u;
146  uint32_t *a = &u.v.a;
147  uint32_t *b = &u.v.b;
148  uint32_t *c = &u.v.c;
149  uint32_t *d = &u.v.d;
150  uint32_t *w = u.v.w;
151  uint32_t f;
152  uint32_t temp;
153  struct md4_step *step;
154  unsigned int round;
155  unsigned int i;
156 
157  /* Sanity checks */
158  assert ( ( context->len % sizeof ( context->ddd.dd.data ) ) == 0 );
159  linker_assert ( &u.ddd.dd.digest.h[0] == a, md4_bad_layout );
160  linker_assert ( &u.ddd.dd.digest.h[1] == b, md4_bad_layout );
161  linker_assert ( &u.ddd.dd.digest.h[2] == c, md4_bad_layout );
162  linker_assert ( &u.ddd.dd.digest.h[3] == d, md4_bad_layout );
163  linker_assert ( &u.ddd.dd.data.dword[0] == w, md4_bad_layout );
164 
165  DBGC ( context, "MD4 digesting:\n" );
166  DBGC_HDA ( context, 0, &context->ddd.dd.digest,
167  sizeof ( context->ddd.dd.digest ) );
168  DBGC_HDA ( context, context->len, &context->ddd.dd.data,
169  sizeof ( context->ddd.dd.data ) );
170 
171  /* Convert h[0..3] to host-endian, and initialise a, b, c, d,
172  * and x[0..15]
173  */
174  for ( i = 0 ; i < ( sizeof ( u.ddd.dword ) /
175  sizeof ( u.ddd.dword[0] ) ) ; i++ ) {
176  le32_to_cpus ( &context->ddd.dword[i] );
177  u.ddd.dword[i] = context->ddd.dword[i];
178  }
179 
180  /* Main loop */
181  for ( i = 0 ; i < 48 ; i++ ) {
182  round = ( i / 16 );
183  step = &md4_steps[round];
184  f = step->f ( &u.v, ( i % 16 ) );
185  temp = *d;
186  *d = *c;
187  *c = *b;
188  *b = rol32 ( ( *a + f + step->constant ), r[round][ i % 4 ] );
189  *a = temp;
190  DBGC2 ( context, "%2d : %08x %08x %08x %08x\n",
191  i, *a, *b, *c, *d );
192  }
193 
194  /* Add chunk to hash and convert back to little-endian */
195  for ( i = 0 ; i < 4 ; i++ ) {
196  context->ddd.dd.digest.h[i] =
197  cpu_to_le32 ( context->ddd.dd.digest.h[i] +
198  u.ddd.dd.digest.h[i] );
199  }
200 
201  DBGC ( context, "MD4 digested:\n" );
202  DBGC_HDA ( context, 0, &context->ddd.dd.digest,
203  sizeof ( context->ddd.dd.digest ) );
204 }
uint32_t a
Definition: md4.c:46
uint32_t d
Definition: md4.c:49
static struct md4_step md4_steps[4]
MD4 steps.
Definition: md4.c:112
static u32 rol32(u32 v, int bits)
Rotate 32-bit value left.
Definition: wpa_tkip.c:173
#define DBGC(...)
Definition: compiler.h:505
struct md4_digest_data dd
Digest and data block.
Definition: md4.h:51
static __always_inline void off_t int c
Definition: efi_uaccess.h:87
uint32_t w[16]
Definition: md4.c:50
uint32_t b
Definition: md4.c:47
uint32_t h[4]
Hash output.
Definition: md4.h:18
MD4 variables.
Definition: md4.c:42
assert((readw(&hdr->flags) &(GTF_reading|GTF_writing))==0)
#define DBGC_HDA(...)
Definition: compiler.h:506
union md4_block data
Accumulated data.
Definition: md4.h:45
size_t len
Amount of accumulated data.
Definition: md4.h:60
#define cpu_to_le32(value)
Definition: byteswap.h:107
union md4_digest_data_dwords ddd
Digest and accumulated data.
Definition: md4.h:62
An MD4 step function.
Definition: md4.c:98
unsigned int uint32_t
Definition: stdint.h:12
MD4 digest and data block.
Definition: md4.h:49
uint32_t(* f)(struct md4_variables *v, unsigned int i)
Calculate f(b,c,d,w)
Definition: md4.c:106
#define DBGC2(...)
Definition: compiler.h:522
void step(void)
Single-step a single process.
Definition: process.c:98
uint32_t dword[sizeof(struct md4_digest_data)/sizeof(uint32_t)]
Raw dwords.
Definition: md4.h:54
union @16 u
#define linker_assert(condition, error_symbol)
Assert a condition at link-time.
Definition: assert.h:68
struct md4_digest digest
Digest of data already processed.
Definition: md4.h:43
#define le32_to_cpus(ptr)
Definition: byteswap.h:125
static const uint8_t r[3][4]
MD4 shift amounts.
Definition: md4.c:54

References md4_variables::a, assert(), md4_variables::b, c, cpu_to_le32, md4_variables::d, md4_digest_data::data, DBGC, DBGC2, DBGC_HDA, md4_digest_data_dwords::dd, md4_context::ddd, md4_digest_data::digest, md4_digest_data_dwords::dword, md4_step::f, md4_digest::h, le32_to_cpus, md4_context::len, linker_assert, md4_steps, r, rol32(), step(), u, and md4_variables::w.

Referenced by md4_update().

◆ md4_update()

static void md4_update ( void *  ctx,
const void *  data,
size_t  len 
)
static

Accumulate data with MD4 algorithm.

Parameters
ctxMD4 context
dataData
lenLength of data

Definition at line 213 of file md4.c.

213  {
214  struct md4_context *context = ctx;
215  const uint8_t *byte = data;
216  size_t offset;
217 
218  /* Accumulate data a byte at a time, performing the digest
219  * whenever we fill the data buffer
220  */
221  while ( len-- ) {
222  offset = ( context->len % sizeof ( context->ddd.dd.data ) );
223  context->ddd.dd.data.byte[offset] = *(byte++);
224  context->len++;
225  if ( ( context->len % sizeof ( context->ddd.dd.data ) ) == 0 )
226  md4_digest ( context );
227  }
228 }
struct md4_digest_data dd
Digest and data block.
Definition: md4.h:51
struct golan_eq_context ctx
Definition: CIB_PRM.h:28
union md4_block data
Accumulated data.
Definition: md4.h:45
static userptr_t size_t offset
Offset of the first segment within the content.
Definition: deflate.h:259
size_t len
Amount of accumulated data.
Definition: md4.h:60
uint8_t byte[64]
Raw bytes.
Definition: md4.h:24
An MD4 context.
Definition: md4.h:58
union md4_digest_data_dwords ddd
Digest and accumulated data.
Definition: md4.h:62
unsigned char uint8_t
Definition: stdint.h:10
uint32_t len
Length.
Definition: ena.h:14
struct arbelprm_port_state_change_st data
Message.
Definition: arbel.h:12
static void md4_digest(struct md4_context *context)
Calculate MD4 digest of accumulated data.
Definition: md4.c:141

References md4_block::byte, ctx, data, md4_digest_data::data, md4_digest_data_dwords::dd, md4_context::ddd, len, md4_context::len, md4_digest(), and offset.

Referenced by md4_final().

◆ md4_final()

static void md4_final ( void *  ctx,
void *  out 
)
static

Generate MD4 digest.

Parameters
ctxMD4 context
outOutput buffer

Definition at line 236 of file md4.c.

236  {
237  struct md4_context *context = ctx;
238  uint64_t len_bits;
239  uint8_t pad;
240 
241  /* Record length before pre-processing */
242  len_bits = cpu_to_le64 ( ( ( uint64_t ) context->len ) * 8 );
243 
244  /* Pad with a single "1" bit followed by as many "0" bits as required */
245  pad = 0x80;
246  do {
247  md4_update ( ctx, &pad, sizeof ( pad ) );
248  pad = 0x00;
249  } while ( ( context->len % sizeof ( context->ddd.dd.data ) ) !=
250  offsetof ( typeof ( context->ddd.dd.data ), final.len ) );
251 
252  /* Append length (in bits) */
253  md4_update ( ctx, &len_bits, sizeof ( len_bits ) );
254  assert ( ( context->len % sizeof ( context->ddd.dd.data ) ) == 0 );
255 
256  /* Copy out final digest */
257  memcpy ( out, &context->ddd.dd.digest,
258  sizeof ( context->ddd.dd.digest ) );
259 }
struct md4_digest_data dd
Digest and data block.
Definition: md4.h:51
unsigned long long uint64_t
Definition: stdint.h:13
#define cpu_to_le64(value)
Definition: byteswap.h:108
#define offsetof(type, field)
Get offset of a field within a structure.
Definition: stddef.h:24
u32 pad[9]
Padding.
Definition: ar9003_mac.h:90
struct golan_eq_context ctx
Definition: CIB_PRM.h:28
void * memcpy(void *dest, const void *src, size_t len) __nonnull
assert((readw(&hdr->flags) &(GTF_reading|GTF_writing))==0)
static void md4_update(void *ctx, const void *data, size_t len)
Accumulate data with MD4 algorithm.
Definition: md4.c:213
union md4_block data
Accumulated data.
Definition: md4.h:45
__be32 out[4]
Definition: CIB_PRM.h:36
size_t len
Amount of accumulated data.
Definition: md4.h:60
An MD4 context.
Definition: md4.h:58
union md4_digest_data_dwords ddd
Digest and accumulated data.
Definition: md4.h:62
unsigned char uint8_t
Definition: stdint.h:10
struct md4_digest digest
Digest of data already processed.
Definition: md4.h:43

References assert(), cpu_to_le64, ctx, md4_digest_data::data, md4_digest_data_dwords::dd, md4_context::ddd, md4_digest_data::digest, md4_context::len, md4_update(), memcpy(), offsetof, out, and pad.

Variable Documentation

◆ __attribute__

◆ r

const uint8_t r[3][4]
static

◆ md4_steps

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 },
}
static uint32_t md4_f_0_15(struct md4_variables *v, unsigned int i)
f(b,c,d,w) for steps 0 to 15
Definition: md4.c:67
static uint32_t md4_f_32_47(struct md4_variables *v, unsigned int i)
f(b,c,d,w) for steps 32 to 47
Definition: md4.c:90
static uint32_t md4_f_16_31(struct md4_variables *v, unsigned int i)
f(b,c,d,w) for steps 16 to 31
Definition: md4.c:78

MD4 steps.

Definition at line 112 of file md4.c.

Referenced by md4_digest().

◆ md4_algorithm

struct digest_algorithm md4_algorithm
Initial value:
= {
.name = "md4",
.ctxsize = sizeof ( struct md4_context ),
.blocksize = sizeof ( union md4_block ),
.digestsize = sizeof ( struct md4_digest ),
.init = md4_init,
.update = md4_update,
.final = md4_final,
}
static void md4_init(void *ctx)
Initialise MD4 algorithm.
Definition: md4.c:126
static void md4_update(void *ctx, const void *data, size_t len)
Accumulate data with MD4 algorithm.
Definition: md4.c:213
static void md4_final(void *ctx, void *out)
Generate MD4 digest.
Definition: md4.c:236
An MD4 context.
Definition: md4.h:58
An MD4 data block.
Definition: md4.h:22
An MD4 digest.
Definition: md4.h:16
uint32_t digestsize
Digest size (i.e.
Definition: pccrr.h:14

MD4 algorithm.

Definition at line 262 of file md4.c.

Referenced by md4_test_exec(), and ntlm_key().

◆ oid_md4

uint8_t oid_md4[] = { ASN1_OID_MD4 }
static

"md4" object identifier

Definition at line 273 of file md4.c.

◆ __asn1_algorithm

struct asn1_algorithm oid_md4_algorithm __asn1_algorithm
Initial value:
= {
.name = "md4",
.digest = &md4_algorithm,
}
#define ASN1_OID_CURSOR(oid_value)
Define an ASN.1 cursor containing an OID.
Definition: asn1.h:292
static uint8_t oid_md4[]
"md4" object identifier
Definition: md4.c:273
struct digest_algorithm md4_algorithm
MD4 algorithm.
Definition: md4.c:262

"md4" OID-identified algorithm

Definition at line 276 of file md4.c.