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Support limitation for "plain" hash (no hash).

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This can be used for mapping problematic cryptosystems which
wipes some key (losetup sometimes set last byte to zero).
This commit is contained in:
Milan Broz
2013-11-10 19:31:02 +01:00
parent db56125708
commit 09c229fe6c
2 changed files with 16 additions and 1 deletions
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11
lib/crypt_plain.c
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@@ -99,7 +99,16 @@ int crypt_plain_hash(struct crypt_device *ctx __attribute__((unused)),
pad_size = 0;
}
r = hash(hash_name_buf, hash_size, key, passphrase_size, passphrase);
/* No hash, copy passphrase directly */
if (!strcmp(hash_name_buf, "plain")) {
if (passphrase_size < hash_size) {
log_dbg("Too short plain passphrase.");
return -EINVAL;
}
memcpy(key, passphrase, hash_size);
r = 0;
} else
r = hash(hash_name_buf, hash_size, key, passphrase_size, passphrase);
if (r == 0 && pad_size)
memset(key + hash_size, 0, pad_size);