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Corrected GCM counter incrementation to use only 32-bits instead of 128-bits

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Using 32-bits has the possibility to overwrite the IV in the first 12
bytes of the Y variable.

Found by Yawning Angel
This commit is contained in:
Paul Bakker
2013-02-27 14:52:37 +01:00
parent e47b34bdc8
commit 3d2dc0f8e5
2 changed files with 3 additions and 1 deletions
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2
library/gcm.c
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@@ -263,7 +263,7 @@ int gcm_crypt_and_tag( gcm_context *ctx,
{
use_len = ( length < 16 ) ? length : 16;
for( i = 16; i > 0; i-- )
for( i = 16; i > 12; i-- )
if( ++y[i - 1] != 0 )
break;