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Check input lengths in GCM

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Manuel Pégourié-Gonnard 2014-06-18 11:29:30 +02:00 committed by Paul Bakker
parent 5bad6afd8c
commit 4467fb7507
1 changed files with 9 additions and 0 deletions
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9
library/gcm.c
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@ -197,6 +197,15 @@ int gcm_crypt_and_tag( gcm_context *ctx,
uint64_t orig_len = length * 8;
uint64_t orig_add_len = add_len * 8;
/* IV and AD are limited to 2^64 bits, so 2^61 bytes */
if( ( (uint64_t) iv_len ) >> 61 != 0 ||
( (uint64_t) add_len ) >> 61 != 0 ||
tag_len > 16 || tag_len < 4 ||
length > 0x03FFFFE0llu )
{
return( POLARSSL_ERR_GCM_BAD_INPUT );
}
memset( y, 0x00, 16 );
memset( work_buf, 0x00, 16 );
memset( tag, 0x00, tag_len );