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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
Download Patch File Download Diff File Expand all files Collapse all files

11
lib/crypt_plain.c
View File

@@ -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);

6
tests/password-hash-test
View File

@@ -135,6 +135,12 @@ crypt_key sha256 512 file $KEY_FILE $KEY_FILE_HEX
crypt_key plain 128 cat /dev/zero 00000000000000000000000000000000 16
crypt_key plain 128 cat /dev/zero 00000000000000000000000000000000 17
crypt_key plain 128 cat $KEY_FILE ${KEY_FILE_HEX:0:28}0000 14
# limiting plain (no hash)
crypt_key plain 256 pwd "xxxxxxxx" 7878787878787878000000000000000000000000000000000000000000000000
crypt_key plain:2 256 pwd "xxxxxxxx" 7878000000000000000000000000000000000000000000000000000000000000
crypt_key plain:9 256 failpwd "xxxxxxxx" x
crypt_key sha256 128 cat $KEY_FILE a82c9227cc54c7475620ce85ba1fca1e 14
crypt_key sha256:14 128 cat $KEY_FILE a82c9227cc54c7475620ce85ba1f0000 14