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pcbc support

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This commit is contained in:
Vladimir 'phcoder' Serbinenko 2011-04-23 02:27:45 +02:00
parent 95172af9fa
commit ed38c849f4
1 changed files with 35 additions and 0 deletions
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35
grub-core/disk/luks.c
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@ -73,6 +73,7 @@ typedef enum
{
GRUB_LUKS_MODE_ECB,
GRUB_LUKS_MODE_CBC,
GRUB_LUKS_MODE_PCBC,
GRUB_LUKS_MODE_XTS
} luks_mode_t;
@ -142,6 +143,29 @@ gf_mul_x (grub_uint8_t *g)
g[0] ^= POLYNOM;
}
static gcry_err_code_t
grub_crypto_pcbc_decrypt (grub_crypto_cipher_handle_t cipher,
void *out, void *in, grub_size_t size,
void *iv)
{
grub_uint8_t *inptr, *outptr, *end;
grub_uint8_t ivt[cipher->cipher->blocksize];
if (!cipher->cipher->decrypt)
return GPG_ERR_NOT_SUPPORTED;
if (size % cipher->cipher->blocksize != 0)
return GPG_ERR_INV_ARG;
end = (grub_uint8_t *) in + size;
for (inptr = in, outptr = out; inptr < end;
inptr += cipher->cipher->blocksize, outptr += cipher->cipher->blocksize)
{
grub_memcpy (ivt, inptr, cipher->cipher->blocksize);
cipher->cipher->decrypt (cipher->ctx, outptr, inptr);
grub_crypto_xor (outptr, outptr, iv, cipher->cipher->blocksize);
grub_crypto_xor (iv, ivt, outptr, cipher->cipher->blocksize);
}
return GPG_ERR_NO_ERROR;
}
static gcry_err_code_t
luks_decrypt (const struct grub_luks *dev,
grub_uint8_t * data, grub_size_t len, grub_disk_addr_t sector)
@ -191,6 +215,12 @@ luks_decrypt (const struct grub_luks *dev,
return err;
break;
case GRUB_LUKS_MODE_PCBC:
err = grub_crypto_pcbc_decrypt (dev->cipher, data + i, data + i,
GRUB_DISK_SECTOR_SIZE, iv);
if (err)
return err;
break;
case GRUB_LUKS_MODE_XTS:
{
int j;
@ -310,6 +340,11 @@ configure_ciphers (const struct grub_luks_phdr *header)
mode = GRUB_LUKS_MODE_CBC;
cipheriv = ciphermode + sizeof ("cbc-") - 1;
}
else if (grub_memcmp (ciphermode, "pcbc-", sizeof ("pcbc-") - 1) == 0)
{
mode = GRUB_LUKS_MODE_PCBC;
cipheriv = ciphermode + sizeof ("pcbc-") - 1;
}
else if (grub_memcmp (ciphermode, "xts-", sizeof ("xts-") - 1) == 0)
{
mode = GRUB_LUKS_MODE_XTS;