mirror of https://github.com/ipxe/ipxe.git
[crypto] Replace MD5 implementation
Replace MD5 implementation with one which is around 20% smaller. This implementation has been verified using the existing MD5 self-tests. Signed-off-by: Michael Brown <mcb30@ipxe.org>pull/6/head
Michael Brown
parent
cdb4802ff1
commit
fba2310562
448
src/crypto/md5.c
448
src/crypto/md5.c
|
|
@ -1,233 +1,295 @@
|
|||
/*
|
||||
* Cryptographic API.
|
||||
* Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>.
|
||||
*
|
||||
* MD5 Message Digest Algorithm (RFC1321).
|
||||
* This program is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU General Public License as
|
||||
* published by the Free Software Foundation; either version 2 of the
|
||||
* License, or any later version.
|
||||
*
|
||||
* Derived from cryptoapi implementation, originally based on the
|
||||
* public domain implementation written by Colin Plumb in 1993.
|
||||
*
|
||||
* Reduced object size by around 50% compared to the original Linux
|
||||
* version for use in Etherboot by Michael Brown.
|
||||
*
|
||||
* Copyright (c) Cryptoapi developers.
|
||||
* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
|
||||
* Copyright (c) 2006 Michael Brown <mbrown@fensystems.co.uk>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify it
|
||||
* under the terms of the GNU General Public License as published by the Free
|
||||
* Software Foundation; either version 2 of the License, or (at your option)
|
||||
* any later version.
|
||||
* This program is distributed in the hope that it will be useful, but
|
||||
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
* General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
||||
*/
|
||||
|
||||
FILE_LICENCE ( GPL2_OR_LATER );
|
||||
|
||||
/** @file
|
||||
*
|
||||
* MD5 algorithm
|
||||
*
|
||||
*/
|
||||
|
||||
#include <stdint.h>
|
||||
#include <string.h>
|
||||
#include <byteswap.h>
|
||||
#include <assert.h>
|
||||
#include <ipxe/crypto.h>
|
||||
#include <ipxe/md5.h>
|
||||
|
||||
/**
|
||||
* Rotate dword left
|
||||
*
|
||||
* @v dword Dword
|
||||
* @v rotate Amount of rotation
|
||||
*/
|
||||
static inline __attribute__ (( always_inline )) uint32_t
|
||||
rol32 ( uint32_t dword, unsigned int rotate ) {
|
||||
return ( ( dword << rotate ) | ( dword >> ( 32 - rotate ) ) );
|
||||
}
|
||||
|
||||
/** MD5 variables */
|
||||
struct md5_variables {
|
||||
/* This layout matches that of struct md5_digest_data,
|
||||
* allowing for efficient endianness-conversion,
|
||||
*/
|
||||
uint32_t a;
|
||||
uint32_t b;
|
||||
uint32_t c;
|
||||
uint32_t d;
|
||||
uint32_t w[16];
|
||||
} __attribute__ (( packed ));
|
||||
|
||||
/** MD5 constants */
|
||||
static const uint32_t k[64] = {
|
||||
0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, 0xf57c0faf, 0x4787c62a,
|
||||
0xa8304613, 0xfd469501, 0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
|
||||
0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821, 0xf61e2562, 0xc040b340,
|
||||
0x265e5a51, 0xe9b6c7aa, 0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8,
|
||||
0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed, 0xa9e3e905, 0xfcefa3f8,
|
||||
0x676f02d9, 0x8d2a4c8a, 0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c,
|
||||
0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70, 0x289b7ec6, 0xeaa127fa,
|
||||
0xd4ef3085, 0x04881d05, 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
|
||||
0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, 0x655b59c3, 0x8f0ccc92,
|
||||
0xffeff47d, 0x85845dd1, 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
|
||||
0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391
|
||||
};
|
||||
|
||||
/** MD5 shift amounts */
|
||||
static const uint8_t r[64] = {
|
||||
7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22,
|
||||
5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20,
|
||||
4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23,
|
||||
6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21
|
||||
};
|
||||
|
||||
/**
|
||||
* f(b,c,d) for steps 0 to 15
|
||||
*
|
||||
* @v v MD5 variables
|
||||
* @ret f f(b,c,d)
|
||||
*/
|
||||
static uint32_t md5_f_0_15 ( struct md5_variables *v ) {
|
||||
return ( v->d ^ ( v->b & ( v->c ^ v->d ) ) );
|
||||
}
|
||||
|
||||
/**
|
||||
* f(b,c,d) for steps 16 to 31
|
||||
*
|
||||
* @v v MD5 variables
|
||||
* @ret f f(b,c,d)
|
||||
*/
|
||||
static uint32_t md5_f_16_31 ( struct md5_variables *v ) {
|
||||
return ( v->c ^ ( v->d & ( v->b ^ v->c ) ) );
|
||||
}
|
||||
|
||||
/**
|
||||
* f(b,c,d) for steps 32 to 47
|
||||
*
|
||||
* @v v MD5 variables
|
||||
* @ret f f(b,c,d)
|
||||
*/
|
||||
static uint32_t md5_f_32_47 ( struct md5_variables *v ) {
|
||||
return ( v->b ^ v->c ^ v->d );
|
||||
}
|
||||
|
||||
/**
|
||||
* f(b,c,d) for steps 48 to 63
|
||||
*
|
||||
* @v v MD5 variables
|
||||
* @ret f f(b,c,d)
|
||||
*/
|
||||
static uint32_t md5_f_48_63 ( struct md5_variables *v ) {
|
||||
return ( v->c ^ ( v->b | (~v->d) ) );
|
||||
}
|
||||
|
||||
/** An MD5 step function */
|
||||
struct md5_step {
|
||||
u32 ( * f ) ( u32 b, u32 c, u32 d );
|
||||
u8 coefficient;
|
||||
u8 constant;
|
||||
/**
|
||||
* Calculate f(b,c,d)
|
||||
*
|
||||
* @v v MD5 variables
|
||||
* @ret f f(b,c,d)
|
||||
*/
|
||||
uint32_t ( * f ) ( struct md5_variables *v );
|
||||
/** Coefficient of i in g=ni+m */
|
||||
uint8_t coefficient;
|
||||
/** Constant term in g=ni+m */
|
||||
uint8_t constant;
|
||||
};
|
||||
|
||||
static u32 f1(u32 b, u32 c, u32 d)
|
||||
{
|
||||
return ( d ^ ( b & ( c ^ d ) ) );
|
||||
}
|
||||
|
||||
static u32 f2(u32 b, u32 c, u32 d)
|
||||
{
|
||||
return ( c ^ ( d & ( b ^ c ) ) );
|
||||
}
|
||||
|
||||
static u32 f3(u32 b, u32 c, u32 d)
|
||||
{
|
||||
return ( b ^ c ^ d );
|
||||
}
|
||||
|
||||
static u32 f4(u32 b, u32 c, u32 d)
|
||||
{
|
||||
return ( c ^ ( b | ~d ) );
|
||||
}
|
||||
|
||||
/** MD5 steps */
|
||||
static struct md5_step md5_steps[4] = {
|
||||
{
|
||||
.f = f1,
|
||||
.coefficient = 1,
|
||||
.constant = 0,
|
||||
},
|
||||
{
|
||||
.f = f2,
|
||||
.coefficient = 5,
|
||||
.constant = 1,
|
||||
},
|
||||
{
|
||||
.f = f3,
|
||||
.coefficient = 3,
|
||||
.constant = 5,
|
||||
},
|
||||
{
|
||||
.f = f4,
|
||||
.coefficient = 7,
|
||||
.constant = 0,
|
||||
}
|
||||
/** 0 to 15 */
|
||||
{ .f = md5_f_0_15, .coefficient = 1, .constant = 0 },
|
||||
/** 16 to 31 */
|
||||
{ .f = md5_f_16_31, .coefficient = 5, .constant = 1 },
|
||||
/** 32 to 47 */
|
||||
{ .f = md5_f_32_47, .coefficient = 3, .constant = 5 },
|
||||
/** 48 to 63 */
|
||||
{ .f = md5_f_48_63, .coefficient = 7, .constant = 0 },
|
||||
};
|
||||
|
||||
static const u8 r[64] = {
|
||||
7,12,17,22,7,12,17,22,7,12,17,22,7,12,17,22,
|
||||
5,9,14,20,5,9,14,20,5,9,14,20,5,9,14,20,
|
||||
4,11,16,23,4,11,16,23,4,11,16,23,4,11,16,23,
|
||||
6,10,15,21,6,10,15,21,6,10,15,21,6,10,15,21
|
||||
};
|
||||
/**
|
||||
* Initialise MD5 algorithm
|
||||
*
|
||||
* @v ctx MD5 context
|
||||
*/
|
||||
static void md5_init ( void *ctx ) {
|
||||
struct md5_context *context = ctx;
|
||||
|
||||
static const u32 k[64] = {
|
||||
0xd76aa478UL, 0xe8c7b756UL, 0x242070dbUL, 0xc1bdceeeUL,
|
||||
0xf57c0fafUL, 0x4787c62aUL, 0xa8304613UL, 0xfd469501UL,
|
||||
0x698098d8UL, 0x8b44f7afUL, 0xffff5bb1UL, 0x895cd7beUL,
|
||||
0x6b901122UL, 0xfd987193UL, 0xa679438eUL, 0x49b40821UL,
|
||||
0xf61e2562UL, 0xc040b340UL, 0x265e5a51UL, 0xe9b6c7aaUL,
|
||||
0xd62f105dUL, 0x02441453UL, 0xd8a1e681UL, 0xe7d3fbc8UL,
|
||||
0x21e1cde6UL, 0xc33707d6UL, 0xf4d50d87UL, 0x455a14edUL,
|
||||
0xa9e3e905UL, 0xfcefa3f8UL, 0x676f02d9UL, 0x8d2a4c8aUL,
|
||||
0xfffa3942UL, 0x8771f681UL, 0x6d9d6122UL, 0xfde5380cUL,
|
||||
0xa4beea44UL, 0x4bdecfa9UL, 0xf6bb4b60UL, 0xbebfbc70UL,
|
||||
0x289b7ec6UL, 0xeaa127faUL, 0xd4ef3085UL, 0x04881d05UL,
|
||||
0xd9d4d039UL, 0xe6db99e5UL, 0x1fa27cf8UL, 0xc4ac5665UL,
|
||||
0xf4292244UL, 0x432aff97UL, 0xab9423a7UL, 0xfc93a039UL,
|
||||
0x655b59c3UL, 0x8f0ccc92UL, 0xffeff47dUL, 0x85845dd1UL,
|
||||
0x6fa87e4fUL, 0xfe2ce6e0UL, 0xa3014314UL, 0x4e0811a1UL,
|
||||
0xf7537e82UL, 0xbd3af235UL, 0x2ad7d2bbUL, 0xeb86d391UL,
|
||||
};
|
||||
context->ddd.dd.digest.h[0] = cpu_to_le32 ( 0x67452301 );
|
||||
context->ddd.dd.digest.h[1] = cpu_to_le32 ( 0xefcdab89 );
|
||||
context->ddd.dd.digest.h[2] = cpu_to_le32 ( 0x98badcfe );
|
||||
context->ddd.dd.digest.h[3] = cpu_to_le32 ( 0x10325476 );
|
||||
context->len = 0;
|
||||
}
|
||||
|
||||
static void md5_transform(u32 *hash, const u32 *in)
|
||||
{
|
||||
u32 a, b, c, d, f, g, temp;
|
||||
int i;
|
||||
/**
|
||||
* Calculate MD5 digest of accumulated data
|
||||
*
|
||||
* @v context MD5 context
|
||||
*/
|
||||
static void md5_digest ( struct md5_context *context ) {
|
||||
union {
|
||||
union md5_digest_data_dwords ddd;
|
||||
struct md5_variables v;
|
||||
} u;
|
||||
uint32_t *a = &u.v.a;
|
||||
uint32_t *b = &u.v.b;
|
||||
uint32_t *c = &u.v.c;
|
||||
uint32_t *d = &u.v.d;
|
||||
uint32_t *w = u.v.w;
|
||||
uint32_t f;
|
||||
uint32_t g;
|
||||
uint32_t temp;
|
||||
struct md5_step *step;
|
||||
unsigned int i;
|
||||
|
||||
a = hash[0];
|
||||
b = hash[1];
|
||||
c = hash[2];
|
||||
d = hash[3];
|
||||
/* Sanity checks */
|
||||
assert ( ( context->len % sizeof ( context->ddd.dd.data ) ) == 0 );
|
||||
linker_assert ( &u.ddd.dd.digest.h[0] == a, md5_bad_layout );
|
||||
linker_assert ( &u.ddd.dd.digest.h[1] == b, md5_bad_layout );
|
||||
linker_assert ( &u.ddd.dd.digest.h[2] == c, md5_bad_layout );
|
||||
linker_assert ( &u.ddd.dd.digest.h[3] == d, md5_bad_layout );
|
||||
linker_assert ( &u.ddd.dd.data.dword[0] == w, md5_bad_layout );
|
||||
|
||||
DBGC ( context, "MD5 digesting:\n" );
|
||||
DBGC_HDA ( context, 0, &context->ddd.dd.digest,
|
||||
sizeof ( context->ddd.dd.digest ) );
|
||||
DBGC_HDA ( context, context->len, &context->ddd.dd.data,
|
||||
sizeof ( context->ddd.dd.data ) );
|
||||
|
||||
/* Convert h[0..3] to host-endian, and initialise a, b, c, d,
|
||||
* and w[0..15]
|
||||
*/
|
||||
for ( i = 0 ; i < ( sizeof ( u.ddd.dword ) /
|
||||
sizeof ( u.ddd.dword[0] ) ) ; i++ ) {
|
||||
le32_to_cpus ( &context->ddd.dword[i] );
|
||||
u.ddd.dword[i] = context->ddd.dword[i];
|
||||
}
|
||||
|
||||
/* Main loop */
|
||||
for ( i = 0 ; i < 64 ; i++ ) {
|
||||
step = &md5_steps[i >> 4];
|
||||
f = step->f ( b, c, d );
|
||||
g = ( ( i * step->coefficient + step->constant ) & 0xf );
|
||||
temp = d;
|
||||
d = c;
|
||||
c = b;
|
||||
a += ( f + k[i] + in[g] );
|
||||
a = ( ( a << r[i] ) | ( a >> ( 32-r[i] ) ) );
|
||||
b += a;
|
||||
a = temp;
|
||||
step = &md5_steps[ i / 16 ];
|
||||
f = step->f ( &u.v );
|
||||
g = ( ( ( step->coefficient * i ) + step->constant ) % 16 );
|
||||
temp = *d;
|
||||
*d = *c;
|
||||
*c = *b;
|
||||
*b = ( *b + rol32 ( ( *a + f + k[i] + w[g] ), r[i] ) );
|
||||
*a = temp;
|
||||
DBGC2 ( context, "%2d : %08x %08x %08x %08x\n",
|
||||
i, *a, *b, *c, *d );
|
||||
}
|
||||
|
||||
hash[0] += a;
|
||||
hash[1] += b;
|
||||
hash[2] += c;
|
||||
hash[3] += d;
|
||||
/* Add chunk to hash and convert back to big-endian */
|
||||
for ( i = 0 ; i < 4 ; i++ ) {
|
||||
context->ddd.dd.digest.h[i] =
|
||||
cpu_to_le32 ( context->ddd.dd.digest.h[i] +
|
||||
u.ddd.dd.digest.h[i] );
|
||||
}
|
||||
|
||||
DBGC ( context, "MD5 digested:\n" );
|
||||
DBGC_HDA ( context, 0, &context->ddd.dd.digest,
|
||||
sizeof ( context->ddd.dd.digest ) );
|
||||
}
|
||||
|
||||
/* XXX: this stuff can be optimized */
|
||||
static inline void le32_to_cpu_array(u32 *buf, unsigned int words)
|
||||
{
|
||||
while (words--) {
|
||||
le32_to_cpus(buf);
|
||||
buf++;
|
||||
/**
|
||||
* Accumulate data with MD5 algorithm
|
||||
*
|
||||
* @v ctx MD5 context
|
||||
* @v data Data
|
||||
* @v len Length of data
|
||||
*/
|
||||
static void md5_update ( void *ctx, const void *data, size_t len ) {
|
||||
struct md5_context *context = ctx;
|
||||
const uint8_t *byte = data;
|
||||
size_t offset;
|
||||
|
||||
/* Accumulate data a byte at a time, performing the digest
|
||||
* whenever we fill the data buffer
|
||||
*/
|
||||
while ( len-- ) {
|
||||
offset = ( context->len % sizeof ( context->ddd.dd.data ) );
|
||||
context->ddd.dd.data.byte[offset] = *(byte++);
|
||||
context->len++;
|
||||
if ( ( context->len % sizeof ( context->ddd.dd.data ) ) == 0 )
|
||||
md5_digest ( context );
|
||||
}
|
||||
}
|
||||
|
||||
static inline void cpu_to_le32_array(u32 *buf, unsigned int words)
|
||||
{
|
||||
while (words--) {
|
||||
cpu_to_le32s(buf);
|
||||
buf++;
|
||||
}
|
||||
}
|
||||
|
||||
static inline void md5_transform_helper(struct md5_ctx *ctx)
|
||||
{
|
||||
le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(u32));
|
||||
md5_transform(ctx->hash, ctx->block);
|
||||
}
|
||||
|
||||
static void md5_init(void *context)
|
||||
{
|
||||
struct md5_ctx *mctx = context;
|
||||
|
||||
mctx->hash[0] = 0x67452301;
|
||||
mctx->hash[1] = 0xefcdab89;
|
||||
mctx->hash[2] = 0x98badcfe;
|
||||
mctx->hash[3] = 0x10325476;
|
||||
mctx->byte_count = 0;
|
||||
}
|
||||
|
||||
static void md5_update(void *context, const void *data, size_t len)
|
||||
{
|
||||
struct md5_ctx *mctx = context;
|
||||
const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
|
||||
|
||||
mctx->byte_count += len;
|
||||
|
||||
if (avail > len) {
|
||||
memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
|
||||
data, len);
|
||||
return;
|
||||
}
|
||||
|
||||
memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
|
||||
data, avail);
|
||||
|
||||
md5_transform_helper(mctx);
|
||||
data += avail;
|
||||
len -= avail;
|
||||
|
||||
while (len >= sizeof(mctx->block)) {
|
||||
memcpy(mctx->block, data, sizeof(mctx->block));
|
||||
md5_transform_helper(mctx);
|
||||
data += sizeof(mctx->block);
|
||||
len -= sizeof(mctx->block);
|
||||
}
|
||||
|
||||
memcpy(mctx->block, data, len);
|
||||
}
|
||||
|
||||
static void md5_final(void *context, void *out)
|
||||
{
|
||||
struct md5_ctx *mctx = context;
|
||||
const unsigned int offset = mctx->byte_count & 0x3f;
|
||||
char *p = (char *)mctx->block + offset;
|
||||
int padding = 56 - (offset + 1);
|
||||
|
||||
*p++ = 0x80;
|
||||
if (padding < 0) {
|
||||
memset(p, 0x00, padding + sizeof (u64));
|
||||
md5_transform_helper(mctx);
|
||||
p = (char *)mctx->block;
|
||||
padding = 56;
|
||||
}
|
||||
|
||||
memset(p, 0, padding);
|
||||
mctx->block[14] = mctx->byte_count << 3;
|
||||
mctx->block[15] = mctx->byte_count >> 29;
|
||||
le32_to_cpu_array(mctx->block, (sizeof(mctx->block) -
|
||||
sizeof(u64)) / sizeof(u32));
|
||||
md5_transform(mctx->hash, mctx->block);
|
||||
cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(u32));
|
||||
memcpy(out, mctx->hash, sizeof(mctx->hash));
|
||||
memset(mctx, 0, sizeof(*mctx));
|
||||
/**
|
||||
* Generate MD5 digest
|
||||
*
|
||||
* @v ctx MD5 context
|
||||
* @v out Output buffer
|
||||
*/
|
||||
static void md5_final ( void *ctx, void *out ) {
|
||||
struct md5_context *context = ctx;
|
||||
uint64_t len_bits;
|
||||
uint8_t pad;
|
||||
|
||||
/* Record length before pre-processing */
|
||||
len_bits = cpu_to_le64 ( ( ( uint64_t ) context->len ) * 8 );
|
||||
|
||||
/* Pad with a single "1" bit followed by as many "0" bits as required */
|
||||
pad = 0x80;
|
||||
do {
|
||||
md5_update ( ctx, &pad, sizeof ( pad ) );
|
||||
pad = 0x00;
|
||||
} while ( ( context->len % sizeof ( context->ddd.dd.data ) ) !=
|
||||
offsetof ( typeof ( context->ddd.dd.data ), final.len ) );
|
||||
|
||||
/* Append length (in bits) */
|
||||
md5_update ( ctx, &len_bits, sizeof ( len_bits ) );
|
||||
assert ( ( context->len % sizeof ( context->ddd.dd.data ) ) == 0 );
|
||||
|
||||
/* Copy out final digest */
|
||||
memcpy ( out, &context->ddd.dd.digest,
|
||||
sizeof ( context->ddd.dd.digest ) );
|
||||
}
|
||||
|
||||
/** MD5 algorithm */
|
||||
struct digest_algorithm md5_algorithm = {
|
||||
.name = "md5",
|
||||
.ctxsize = MD5_CTX_SIZE,
|
||||
.blocksize = ( MD5_BLOCK_WORDS * 4 ),
|
||||
.digestsize = MD5_DIGEST_SIZE,
|
||||
.ctxsize = sizeof ( struct md5_context ),
|
||||
.blocksize = sizeof ( union md5_block ),
|
||||
.digestsize = sizeof ( struct md5_digest ),
|
||||
.init = md5_init,
|
||||
.update = md5_update,
|
||||
.final = md5_final,
|
||||
|
|
|
|||
|
|
@ -1,23 +1,72 @@
|
|||
#ifndef _IPXE_MD5_H
|
||||
#define _IPXE_MD5_H
|
||||
|
||||
/** @file
|
||||
*
|
||||
* MD5 algorithm
|
||||
*
|
||||
*/
|
||||
|
||||
FILE_LICENCE ( GPL2_OR_LATER );
|
||||
|
||||
struct digest_algorithm;
|
||||
|
||||
#include <stdint.h>
|
||||
#include <ipxe/crypto.h>
|
||||
|
||||
#define MD5_DIGEST_SIZE 16
|
||||
#define MD5_BLOCK_WORDS 16
|
||||
#define MD5_HASH_WORDS 4
|
||||
|
||||
struct md5_ctx {
|
||||
u32 hash[MD5_HASH_WORDS];
|
||||
u32 block[MD5_BLOCK_WORDS];
|
||||
u64 byte_count;
|
||||
/** An MD5 digest */
|
||||
struct md5_digest {
|
||||
/** Hash output */
|
||||
uint32_t h[4];
|
||||
};
|
||||
|
||||
#define MD5_CTX_SIZE sizeof ( struct md5_ctx )
|
||||
/** An MD5 data block */
|
||||
union md5_block {
|
||||
/** Raw bytes */
|
||||
uint8_t byte[64];
|
||||
/** Raw dwords */
|
||||
uint32_t dword[16];
|
||||
/** Final block structure */
|
||||
struct {
|
||||
/** Padding */
|
||||
uint8_t pad[56];
|
||||
/** Length in bits */
|
||||
uint64_t len;
|
||||
} final;
|
||||
};
|
||||
|
||||
/** MD5 digest and data block
|
||||
*
|
||||
* The order of fields within this structure is designed to minimise
|
||||
* code size.
|
||||
*/
|
||||
struct md5_digest_data {
|
||||
/** Digest of data already processed */
|
||||
struct md5_digest digest;
|
||||
/** Accumulated data */
|
||||
union md5_block data;
|
||||
} __attribute__ (( packed ));
|
||||
|
||||
/** MD5 digest and data block */
|
||||
union md5_digest_data_dwords {
|
||||
/** Digest and data block */
|
||||
struct md5_digest_data dd;
|
||||
/** Raw dwords */
|
||||
uint32_t dword[ sizeof ( struct md5_digest_data ) /
|
||||
sizeof ( uint32_t ) ];
|
||||
};
|
||||
|
||||
/** An MD5 context */
|
||||
struct md5_context {
|
||||
/** Amount of accumulated data */
|
||||
size_t len;
|
||||
/** Digest and accumulated data */
|
||||
union md5_digest_data_dwords ddd;
|
||||
} __attribute__ (( packed ));
|
||||
|
||||
/** MD5 context size */
|
||||
#define MD5_CTX_SIZE sizeof ( struct md5_context )
|
||||
|
||||
/** MD5 digest size */
|
||||
#define MD5_DIGEST_SIZE sizeof ( struct md5_digest )
|
||||
|
||||
extern struct digest_algorithm md5_algorithm;
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue