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support non-512B sectors for geli

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This commit is contained in:
Vladimir 'phcoder' Serbinenko 2011-04-24 14:59:38 +02:00
parent ae13460ee1
commit 3e90811d88
4 changed files with 49 additions and 24 deletions
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50
grub-core/disk/cryptodisk.c
View file

@ -35,7 +35,10 @@ GRUB_MOD_LICENSE ("GPLv3+");
/* Our irreducible polynom is x^128+x^7+x^2+x+1. Lowest byte of it is: */
#define GF_POLYNOM 0x87
#define GF_PER_SECTOR (GRUB_DISK_SECTOR_SIZE / GRUB_CRYPTODISK_GF_BYTES)
static inline int GF_PER_SECTOR (const struct grub_cryptodisk *dev)
{
return 1U << (dev->log_sector_size - GRUB_CRYPTODISK_GF_LOG_BYTES);
}
static grub_cryptodisk_t cryptodisk_list = NULL;
static grub_uint8_t n = 0;
@ -44,7 +47,7 @@ static void
gf_mul_x (grub_uint8_t *g)
{
int over = 0, over2 = 0;
int j;
unsigned j;
for (j = 0; j < GRUB_CRYPTODISK_GF_BYTES; j++)
{
@ -64,7 +67,7 @@ gf_mul_x_be (grub_uint8_t *g)
int over = 0, over2 = 0;
int j;
for (j = GRUB_CRYPTODISK_GF_BYTES - 1; j >= 0; j--)
for (j = (int) GRUB_CRYPTODISK_GF_BYTES - 1; j >= 0; j--)
{
over2 = !!(g[j] & 0x80);
g[j] <<= 1;
@ -78,7 +81,7 @@ gf_mul_x_be (grub_uint8_t *g)
static void
gf_mul_be (grub_uint8_t *o, const grub_uint8_t *a, const grub_uint8_t *b)
{
int i;
unsigned i;
grub_uint8_t t[GRUB_CRYPTODISK_GF_BYTES];
grub_memset (o, 0, GRUB_CRYPTODISK_GF_BYTES);
grub_memcpy (t, b, GRUB_CRYPTODISK_GF_BYTES);
@ -129,14 +132,15 @@ generate_lrw_sector (struct lrw_sector *sec,
grub_uint16_t c;
int j;
grub_memcpy (idx, iv, GRUB_CRYPTODISK_GF_BYTES);
sec->low_byte = (idx[GRUB_CRYPTODISK_GF_BYTES - 1] & (GF_PER_SECTOR - 1));
sec->low_byte_c = (((GF_PER_SECTOR - 1) & ~sec->low_byte) + 1);
idx[GRUB_CRYPTODISK_GF_BYTES - 1] &= ~(GF_PER_SECTOR - 1);
sec->low_byte = (idx[GRUB_CRYPTODISK_GF_BYTES - 1]
& (GF_PER_SECTOR (dev) - 1));
sec->low_byte_c = (((GF_PER_SECTOR (dev) - 1) & ~sec->low_byte) + 1);
idx[GRUB_CRYPTODISK_GF_BYTES - 1] &= ~(GF_PER_SECTOR (dev) - 1);
gf_mul_be (sec->low, dev->lrw_key, idx);
if (!sec->low_byte)
return;
c = idx[GRUB_CRYPTODISK_GF_BYTES - 1] + GF_PER_SECTOR;
c = idx[GRUB_CRYPTODISK_GF_BYTES - 1] + GF_PER_SECTOR (dev);
if (c & 0x100)
{
for (j = GRUB_CRYPTODISK_GF_BYTES - 2; j >= 0; j--)
@ -155,9 +159,10 @@ lrw_xor (const struct lrw_sector *sec,
const struct grub_cryptodisk *dev,
grub_uint8_t *b)
{
int i;
unsigned i;
for (i = 0; i < sec->low_byte_c * GRUB_CRYPTODISK_GF_BYTES; i += GRUB_CRYPTODISK_GF_BYTES)
for (i = 0; i < sec->low_byte_c * GRUB_CRYPTODISK_GF_BYTES;
i += GRUB_CRYPTODISK_GF_BYTES)
grub_crypto_xor (b + i, b + i, sec->low, GRUB_CRYPTODISK_GF_BYTES);
grub_crypto_xor (b, b, dev->lrw_precalc + GRUB_CRYPTODISK_GF_BYTES * sec->low_byte,
sec->low_byte_c * GRUB_CRYPTODISK_GF_BYTES);
@ -165,7 +170,7 @@ lrw_xor (const struct lrw_sector *sec,
return;
for (i = sec->low_byte_c * GRUB_CRYPTODISK_GF_BYTES;
i < GRUB_DISK_SECTOR_SIZE; i += GRUB_CRYPTODISK_GF_BYTES)
i < (1U << dev->log_sector_size); i += GRUB_CRYPTODISK_GF_BYTES)
grub_crypto_xor (b + i, b + i, sec->high, GRUB_CRYPTODISK_GF_BYTES);
grub_crypto_xor (b + sec->low_byte_c * GRUB_CRYPTODISK_GF_BYTES,
b + sec->low_byte_c * GRUB_CRYPTODISK_GF_BYTES,
@ -184,7 +189,7 @@ grub_cryptodisk_decrypt (const struct grub_cryptodisk *dev,
if (dev->mode == GRUB_CRYPTODISK_MODE_ECB)
return grub_crypto_ecb_decrypt (dev->cipher, data, data, len);
for (i = 0; i < len; i += GRUB_DISK_SECTOR_SIZE)
for (i = 0; i < len; i += (1U << dev->log_sector_size))
{
grub_size_t sz = ((dev->cipher->cipher->blocksize
+ sizeof (grub_uint32_t) - 1)
@ -203,7 +208,7 @@ grub_cryptodisk_decrypt (const struct grub_cryptodisk *dev,
grub_memset (ctx, 0, sizeof (ctx));
tmp = grub_cpu_to_le64 (sector << GRUB_DISK_SECTOR_BITS);
tmp = grub_cpu_to_le64 (sector << dev->log_sector_size);
dev->iv_hash->init (ctx);
dev->iv_hash->write (ctx, dev->iv_prefix, dev->iv_prefix_len);
dev->iv_hash->write (ctx, &tmp, sizeof (tmp));
@ -236,26 +241,26 @@ grub_cryptodisk_decrypt (const struct grub_cryptodisk *dev,
{
case GRUB_CRYPTODISK_MODE_CBC:
err = grub_crypto_cbc_decrypt (dev->cipher, data + i, data + i,
GRUB_DISK_SECTOR_SIZE, iv);
(1U << dev->log_sector_size), iv);
if (err)
return err;
break;
case GRUB_CRYPTODISK_MODE_PCBC:
err = grub_crypto_pcbc_decrypt (dev->cipher, data + i, data + i,
GRUB_DISK_SECTOR_SIZE, iv);
(1U << dev->log_sector_size), iv);
if (err)
return err;
break;
case GRUB_CRYPTODISK_MODE_XTS:
{
int j;
unsigned j;
err = grub_crypto_ecb_encrypt (dev->secondary_cipher, iv, iv,
dev->cipher->cipher->blocksize);
if (err)
return err;
for (j = 0; j < GRUB_DISK_SECTOR_SIZE;
for (j = 0; j < (1U << dev->log_sector_size);
j += dev->cipher->cipher->blocksize)
{
grub_crypto_xor (data + i + j, data + i + j, iv,
@ -279,7 +284,8 @@ grub_cryptodisk_decrypt (const struct grub_cryptodisk *dev,
lrw_xor (&sec, dev, data + i);
err = grub_crypto_ecb_decrypt (dev->cipher, data + i,
data + i, GRUB_DISK_SECTOR_SIZE);
data + i,
(1U << dev->log_sector_size));
if (err)
return err;
lrw_xor (&sec, dev, data + i);
@ -333,17 +339,17 @@ grub_cryptodisk_setkey (grub_cryptodisk_t dev, grub_uint8_t *key, grub_size_t ke
if (dev->mode == GRUB_CRYPTODISK_MODE_LRW)
{
int i;
unsigned i;
grub_uint8_t idx[GRUB_CRYPTODISK_GF_BYTES];
grub_free (dev->lrw_precalc);
grub_memcpy (dev->lrw_key, key + real_keysize,
dev->cipher->cipher->blocksize);
dev->lrw_precalc = grub_malloc (GRUB_DISK_SECTOR_SIZE);
dev->lrw_precalc = grub_malloc ((1U << dev->log_sector_size));
if (!dev->lrw_precalc)
return GPG_ERR_OUT_OF_MEMORY;
grub_memset (idx, 0, GRUB_CRYPTODISK_GF_BYTES);
for (i = 0; i < GRUB_DISK_SECTOR_SIZE;
for (i = 0; i < (1U << dev->log_sector_size);
i += GRUB_CRYPTODISK_GF_BYTES)
{
idx[GRUB_CRYPTODISK_GF_BYTES - 1] = i / GRUB_CRYPTODISK_GF_BYTES;
@ -401,6 +407,8 @@ grub_cryptodisk_open (const char *name, grub_disk_t disk,
if (!dev)
return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "No such device");
disk->log_sector_size = dev->log_sector_size;
#ifdef GRUB_UTIL
if (dev->cheat)
{

15
grub-core/disk/geli.c
View file

@ -73,7 +73,8 @@ struct grub_geli_phdr
grub_uint32_t unused1;
grub_uint16_t alg;
grub_uint16_t keylen;
grub_uint16_t unused3[7];
grub_uint16_t unused3[5];
grub_uint32_t sector_size;
grub_uint8_t keys_used;
grub_uint32_t niter;
grub_uint8_t salt[64];
@ -120,6 +121,14 @@ configure_ciphers (const struct grub_geli_phdr *header)
grub_dprintf ("geli", "wrong magic %02x\n", header->magic[0]);
return NULL;
}
if ((grub_le_to_cpu32 (header->sector_size)
& (grub_le_to_cpu32 (header->sector_size) - 1))
|| grub_le_to_cpu32 (header->sector_size) == 0)
{
grub_dprintf ("geli", "incorrect sector size %d\n",
grub_le_to_cpu32 (header->sector_size));
return NULL;
}
#if 0
optr = uuid;
@ -199,6 +208,10 @@ configure_ciphers (const struct grub_geli_phdr *header)
newdev->essiv_hash = NULL;
newdev->hash = hash;
newdev->iv_hash = iv_hash;
for (newdev->log_sector_size = 0;
(1U << newdev->log_sector_size) < grub_le_to_cpu32 (header->sector_size);
newdev->log_sector_size++);
#if 0
grub_memcpy (newdev->uuid, uuid, sizeof (newdev->uuid));
#endif

1
grub-core/disk/luks.c
View file

@ -283,6 +283,7 @@ configure_ciphers (const struct grub_luks_phdr *header)
newdev->essiv_cipher = essiv_cipher;
newdev->essiv_hash = essiv_hash;
newdev->hash = hash;
newdev->log_sector_size = 9;
grub_memcpy (newdev->uuid, uuid, sizeof (newdev->uuid));
return newdev;
}

7
include/grub/cryptodisk.h
View file

@ -43,8 +43,10 @@ typedef enum
#define GRUB_CRYPTODISK_MAX_UUID_LENGTH 63
#define GRUB_CRYPTODISK_GF_SIZE 128
#define GRUB_CRYPTODISK_GF_BYTES (GRUB_CRYPTODISK_GF_SIZE / 8)
#define GRUB_CRYPTODISK_GF_LOG_SIZE 7
#define GRUB_CRYPTODISK_GF_SIZE (1U << GRUB_CRYPTODISK_GF_LOG_SIZE)
#define GRUB_CRYPTODISK_GF_LOG_BYTES (GRUB_CRYPTODISK_GF_LOG_SIZE - 3)
#define GRUB_CRYPTODISK_GF_BYTES (1U << GRUB_CRYPTODISK_GF_LOG_BYTES)
struct grub_cryptodisk
{
@ -71,6 +73,7 @@ struct grub_cryptodisk
char *cheat;
int cheat_fd;
#endif
int log_sector_size;
struct grub_cryptodisk *next;
};
typedef struct grub_cryptodisk *grub_cryptodisk_t;