/* xnu_uuid.c - transform 64-bit serial number
to 128-bit uuid suitable for xnu. */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 1995,1996,1998,1999,2001,2002,
* 2003, 2009 Free Software Foundation, Inc.
*
* GRUB 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 3 of the License, or
* (at your option) any later version.
*
* GRUB 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 GRUB. If not, see .
*/
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
struct tohash
{
grub_uint8_t prefix[16];
grub_uint64_t serial;
} __attribute__ ((packed));
/* This prefix is used by xnu and boot-132 to hash
together with volume serial. */
static grub_uint8_t hash_prefix[16]
= {0xB3, 0xE2, 0x0F, 0x39, 0xF2, 0x92, 0x11, 0xD6,
0x97, 0xA4, 0x00, 0x30, 0x65, 0x43, 0xEC, 0xAC};
#define rol(x,n) ( ((x) << (n)) | ((x) >> (32-(n))) )
#define ror(x,n) ( ((x) >> (n)) | ((x) << (32-(n))) )
typedef struct {
grub_uint32_t A,B,C,D; /* chaining variables */
grub_uint32_t nblocks;
grub_uint8_t buf[64];
int count;
} MD5_CONTEXT;
static void
md5_init( void *context )
{
MD5_CONTEXT *ctx = context;
ctx->A = 0x67452301;
ctx->B = 0xefcdab89;
ctx->C = 0x98badcfe;
ctx->D = 0x10325476;
ctx->nblocks = 0;
ctx->count = 0;
}
/* These are the four functions used in the four steps of the MD5 algorithm
and defined in the RFC 1321. The first function is a little bit optimized
(as found in Colin Plumbs public domain implementation). */
/* #define FF(b, c, d) ((b & c) | (~b & d)) */
#define FF(b, c, d) (d ^ (b & (c ^ d)))
#define FG(b, c, d) FF (d, b, c)
#define FH(b, c, d) (b ^ c ^ d)
#define FI(b, c, d) (c ^ (b | ~d))
/****************
* transform n*64 grub_uint8_ts
*/
static void
transform ( MD5_CONTEXT *ctx, const unsigned char *data )
{
grub_uint32_t correct_words[16];
register grub_uint32_t A = ctx->A;
register grub_uint32_t B = ctx->B;
register grub_uint32_t C = ctx->C;
register grub_uint32_t D = ctx->D;
grub_uint32_t *cwp = correct_words;
#ifdef GRUB_CPU_WORDS_BIGENDIAN
{
int i;
const grub_uint32_t *p = (const grub_uint32_t *) data;
for (i = 0; i < 16; i++)
correct_words[i] = grub_le_to_cpu32 (p[i]);
}
#else
memcpy (correct_words, data, 64);
#endif
#define OP(a, b, c, d, s, T) \
do \
{ \
a += FF (b, c, d) + (*cwp++) + T; \
a = rol(a, s); \
a += b; \
} \
while (0)
/* Before we start, one word about the strange constants.
They are defined in RFC 1321 as
T[i] = (int) (4294967296.0 * fabs (sin (i))), i=1..64
*/
/* Round 1. */
OP (A, B, C, D, 7, 0xd76aa478);
OP (D, A, B, C, 12, 0xe8c7b756);
OP (C, D, A, B, 17, 0x242070db);
OP (B, C, D, A, 22, 0xc1bdceee);
OP (A, B, C, D, 7, 0xf57c0faf);
OP (D, A, B, C, 12, 0x4787c62a);
OP (C, D, A, B, 17, 0xa8304613);
OP (B, C, D, A, 22, 0xfd469501);
OP (A, B, C, D, 7, 0x698098d8);
OP (D, A, B, C, 12, 0x8b44f7af);
OP (C, D, A, B, 17, 0xffff5bb1);
OP (B, C, D, A, 22, 0x895cd7be);
OP (A, B, C, D, 7, 0x6b901122);
OP (D, A, B, C, 12, 0xfd987193);
OP (C, D, A, B, 17, 0xa679438e);
OP (B, C, D, A, 22, 0x49b40821);
#undef OP
#define OP(f, a, b, c, d, k, s, T) \
do \
{ \
a += f (b, c, d) + correct_words[k] + T; \
a = rol(a, s); \
a += b; \
} \
while (0)
/* Round 2. */
OP (FG, A, B, C, D, 1, 5, 0xf61e2562);
OP (FG, D, A, B, C, 6, 9, 0xc040b340);
OP (FG, C, D, A, B, 11, 14, 0x265e5a51);
OP (FG, B, C, D, A, 0, 20, 0xe9b6c7aa);
OP (FG, A, B, C, D, 5, 5, 0xd62f105d);
OP (FG, D, A, B, C, 10, 9, 0x02441453);
OP (FG, C, D, A, B, 15, 14, 0xd8a1e681);
OP (FG, B, C, D, A, 4, 20, 0xe7d3fbc8);
OP (FG, A, B, C, D, 9, 5, 0x21e1cde6);
OP (FG, D, A, B, C, 14, 9, 0xc33707d6);
OP (FG, C, D, A, B, 3, 14, 0xf4d50d87);
OP (FG, B, C, D, A, 8, 20, 0x455a14ed);
OP (FG, A, B, C, D, 13, 5, 0xa9e3e905);
OP (FG, D, A, B, C, 2, 9, 0xfcefa3f8);
OP (FG, C, D, A, B, 7, 14, 0x676f02d9);
OP (FG, B, C, D, A, 12, 20, 0x8d2a4c8a);
/* Round 3. */
OP (FH, A, B, C, D, 5, 4, 0xfffa3942);
OP (FH, D, A, B, C, 8, 11, 0x8771f681);
OP (FH, C, D, A, B, 11, 16, 0x6d9d6122);
OP (FH, B, C, D, A, 14, 23, 0xfde5380c);
OP (FH, A, B, C, D, 1, 4, 0xa4beea44);
OP (FH, D, A, B, C, 4, 11, 0x4bdecfa9);
OP (FH, C, D, A, B, 7, 16, 0xf6bb4b60);
OP (FH, B, C, D, A, 10, 23, 0xbebfbc70);
OP (FH, A, B, C, D, 13, 4, 0x289b7ec6);
OP (FH, D, A, B, C, 0, 11, 0xeaa127fa);
OP (FH, C, D, A, B, 3, 16, 0xd4ef3085);
OP (FH, B, C, D, A, 6, 23, 0x04881d05);
OP (FH, A, B, C, D, 9, 4, 0xd9d4d039);
OP (FH, D, A, B, C, 12, 11, 0xe6db99e5);
OP (FH, C, D, A, B, 15, 16, 0x1fa27cf8);
OP (FH, B, C, D, A, 2, 23, 0xc4ac5665);
/* Round 4. */
OP (FI, A, B, C, D, 0, 6, 0xf4292244);
OP (FI, D, A, B, C, 7, 10, 0x432aff97);
OP (FI, C, D, A, B, 14, 15, 0xab9423a7);
OP (FI, B, C, D, A, 5, 21, 0xfc93a039);
OP (FI, A, B, C, D, 12, 6, 0x655b59c3);
OP (FI, D, A, B, C, 3, 10, 0x8f0ccc92);
OP (FI, C, D, A, B, 10, 15, 0xffeff47d);
OP (FI, B, C, D, A, 1, 21, 0x85845dd1);
OP (FI, A, B, C, D, 8, 6, 0x6fa87e4f);
OP (FI, D, A, B, C, 15, 10, 0xfe2ce6e0);
OP (FI, C, D, A, B, 6, 15, 0xa3014314);
OP (FI, B, C, D, A, 13, 21, 0x4e0811a1);
OP (FI, A, B, C, D, 4, 6, 0xf7537e82);
OP (FI, D, A, B, C, 11, 10, 0xbd3af235);
OP (FI, C, D, A, B, 2, 15, 0x2ad7d2bb);
OP (FI, B, C, D, A, 9, 21, 0xeb86d391);
/* Put checksum in context given as argument. */
ctx->A += A;
ctx->B += B;
ctx->C += C;
ctx->D += D;
}
/* The routine updates the message-digest context to
* account for the presence of each of the characters inBuf[0..inLen-1]
* in the message whose digest is being computed.
*/
static void
md5_write( void *context, const void *inbuf_arg , grub_size_t inlen)
{
const unsigned char *inbuf = inbuf_arg;
MD5_CONTEXT *hd = context;
if( hd->count == 64 ) /* flush the buffer */
{
transform( hd, hd->buf );
// _gcry_burn_stack (80+6*sizeof(void*));
hd->count = 0;
hd->nblocks++;
}
if( !inbuf )
return;
if( hd->count )
{
for( ; inlen && hd->count < 64; inlen-- )
hd->buf[hd->count++] = *inbuf++;
md5_write( hd, NULL, 0 );
if( !inlen )
return;
}
// _gcry_burn_stack (80+6*sizeof(void*));
while( inlen >= 64 )
{
transform( hd, inbuf );
hd->count = 0;
hd->nblocks++;
inlen -= 64;
inbuf += 64;
}
for( ; inlen && hd->count < 64; inlen-- )
hd->buf[hd->count++] = *inbuf++;
}
/* The routine final terminates the message-digest computation and
* ends with the desired message digest in mdContext->digest[0...15].
* The handle is prepared for a new MD5 cycle.
* Returns 16 grub_uint8_ts representing the digest.
*/
static void
md5_final( void *context)
{
MD5_CONTEXT *hd = context;
grub_uint32_t t, msb, lsb;
grub_uint32_t *p;
md5_write(hd, NULL, 0); /* flush */;
t = hd->nblocks;
/* multiply by 64 to make a grub_uint8_t count */
lsb = t << 6;
msb = t >> 26;
/* add the count */
t = lsb;
if( (lsb += hd->count) < t )
msb++;
/* multiply by 8 to make a bit count */
t = lsb;
lsb <<= 3;
msb <<= 3;
msb |= t >> 29;
if( hd->count < 56 ) /* enough room */
{
hd->buf[hd->count++] = 0x80; /* pad */
while( hd->count < 56 )
hd->buf[hd->count++] = 0; /* pad */
}
else /* need one extra block */
{
hd->buf[hd->count++] = 0x80; /* pad character */
while( hd->count < 64 )
hd->buf[hd->count++] = 0;
md5_write(hd, NULL, 0); /* flush */;
grub_memset(hd->buf, 0, 56 ); /* fill next block with zeroes */
}
/* append the 64 bit count */
hd->buf[56] = lsb ;
hd->buf[57] = lsb >> 8;
hd->buf[58] = lsb >> 16;
hd->buf[59] = lsb >> 24;
hd->buf[60] = msb ;
hd->buf[61] = msb >> 8;
hd->buf[62] = msb >> 16;
hd->buf[63] = msb >> 24;
transform( hd, hd->buf );
// _gcry_burn_stack (80+6*sizeof(void*));
p = (grub_uint32_t *) hd->buf;
#define X(a) do { *p = grub_le_to_cpu32 (hd->a); p++; } while (0)
X(A);
X(B);
X(C);
X(D);
#undef X
}
/**
* GRUB2 Crypto Interface
* Written by Michael Gorven
*/
static grub_err_t
md5 (const char *in, grub_size_t insize, char *out)
{
MD5_CONTEXT hd;
md5_init (&hd);
md5_write (&hd, in, insize);
md5_final (&hd);
grub_memcpy (out, hd.buf, 16);
return GRUB_ERR_NONE;
}
static grub_err_t
grub_cmd_xnu_uuid (grub_command_t cmd __attribute__ ((unused)),
int argc, char **args)
{
struct tohash hashme;
grub_uint8_t xnu_uuid[16];
char uuid_string[sizeof ("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")];
char *ptr;
if (argc < 1)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "UUID required");
hashme.serial = grub_cpu_to_be64 (grub_strtoull (args[0], 0, 16));
grub_memcpy (hashme.prefix, hash_prefix, sizeof (hashme.prefix));
md5 ((char *) &hashme, sizeof (hashme), (char *) xnu_uuid);
xnu_uuid[6] = (xnu_uuid[6] & 0xf) | 0x30;
xnu_uuid[8] = (xnu_uuid[8] & 0x3f) | 0x80;
grub_sprintf (uuid_string,
"%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
(unsigned int) xnu_uuid[0], (unsigned int) xnu_uuid[1],
(unsigned int) xnu_uuid[2], (unsigned int) xnu_uuid[3],
(unsigned int) xnu_uuid[4], (unsigned int) xnu_uuid[5],
(unsigned int) ((xnu_uuid[6] & 0xf) | 0x30),
(unsigned int) xnu_uuid[7],
(unsigned int) ((xnu_uuid[8] & 0x3f) | 0x80),
(unsigned int) xnu_uuid[9],
(unsigned int) xnu_uuid[10], (unsigned int) xnu_uuid[11],
(unsigned int) xnu_uuid[12], (unsigned int) xnu_uuid[13],
(unsigned int) xnu_uuid[14], (unsigned int) xnu_uuid[15]);
for (ptr = uuid_string; *ptr; ptr++)
*ptr = grub_toupper (*ptr);
if (argc == 1)
grub_printf ("%s", uuid_string);
if (argc > 1)
grub_env_set (args[1], uuid_string);
return GRUB_ERR_NONE;
}
static grub_command_t cmd;
GRUB_MOD_INIT (xnu_uuid)
{
cmd = grub_register_command ("xnu_uuid", grub_cmd_xnu_uuid,
"xnu_uuid GRUBUUID [VARNAME]",
"Transform 64-bit UUID to format "
"suitable for xnu.");
}
GRUB_MOD_FINI (xnu_uuid)
{
grub_unregister_command (cmd);
}