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[2001-04-26 18:28 UTC] kettler at gmx dot net
When encrypting using a block cipher and cfb or ofb mode the mcrypt_generic/mdecrypt_generic function
still pad the input to a multiple of the underlying algorithm's block size. Input should not be padded when used with
cfb or ofb mode.
Script showing the bug:
$key = pack("H*", "0000000000000000000000000000000000000000000000000000000000000000");
$iv = pack("H*", "00000000000000000000000000000000");
$plain = pack("H*", "0000000000000000");
$handle = mcrypt_module_open(MCRYPT_TWOFISH, "", MCRYPT_MODE_CFB, "");
mcrypt_generic_init($handle, $key, $iv);
$crypted = mcrypt_generic($handle, $plain);
mcrypt_generic_end($handle);
print bin2hex($plain)."\n\n";
print bin2hex($crypted)."\n\n";
Proposed patch:
--- mcrypt/mcrypt.c Wed Nov 22 22:40:15 2000
+++ mcrypt-sk/mcrypt.c Fri Apr 27 00:25:16 2001
@@ -498,7 +498,7 @@
convert_to_string_ex (data);
/* Check blocksize */
- if (mcrypt_enc_is_block_algorithm (td) == 1) { /* It's a block algorithm */
+ if (mcrypt_enc_is_block_mode (td) == 1) { /* It's a block algorithm */
block_size = mcrypt_enc_get_block_size (td);
data_size = (((Z_STRLEN_PP(data) - 1) / block_size) + 1) * block_size;
data_s = emalloc (data_size);
@@ -539,7 +539,7 @@
convert_to_string_ex (data);
/* Check blocksize */
- if (mcrypt_enc_is_block_algorithm (td) == 1) { /* It's a block algorithm */
+ if (mcrypt_enc_is_block_mode (td) == 1) { /* It's a block algorithm */
block_size = mcrypt_enc_get_block_size (td);
data_size = (((Z_STRLEN_PP(data) - 1) / block_size) + 1) * block_size;
data_s = emalloc (data_size);
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Last updated: Mon May 05 21:01:29 2025 UTC |
Same bug also in php_mcrypt_do_crypt, here's the new patch: --- php-4.0.4pl1/ext/mcrypt/mcrypt.c Wed Nov 22 22:40:15 2000 +++ php-4.0.4pl1-sk/ext/mcrypt/mcrypt.c Sat Apr 28 18:44:09 2001 @@ -498,7 +498,7 @@ convert_to_string_ex (data); /* Check blocksize */ - if (mcrypt_enc_is_block_algorithm (td) == 1) { /* It's a block algorithm */ + if (mcrypt_enc_is_block_mode (td) == 1) { /* It's a block algorithm */ block_size = mcrypt_enc_get_block_size (td); data_size = (((Z_STRLEN_PP(data) - 1) / block_size) + 1) * block_size; data_s = emalloc (data_size); @@ -539,7 +539,7 @@ convert_to_string_ex (data); /* Check blocksize */ - if (mcrypt_enc_is_block_algorithm (td) == 1) { /* It's a block algorithm */ + if (mcrypt_enc_is_block_mode (td) == 1) { /* It's a block algorithm */ block_size = mcrypt_enc_get_block_size (td); data_size = (((Z_STRLEN_PP(data) - 1) / block_size) + 1) * block_size; data_s = emalloc (data_size); @@ -1280,7 +1280,7 @@ } /* Check blocksize */ - if (mcrypt_enc_is_block_algorithm (td) == 1) { /* It's a block algorithm */ + if (mcrypt_enc_is_block_mode (td) == 1) { /* It's a block algorithm */ block_size = mcrypt_enc_get_block_size (td); data_size = (((Z_STRLEN_PP(data) - 1) / block_size) + 1) * block_size; data_s = emalloc (data_size);