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Add more commentary. Check that *num is smaller than the block size.

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This commit is contained in:
Richard Levitte 2002-10-11 22:42:40 +00:00
parent dbcc560717
commit 9a01bc0732
1 changed files with 5 additions and 1 deletions
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6
crypto/aes/aes_ctr.c
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@ -90,7 +90,10 @@ static void AES_ctr128_inc(unsigned char *counter) {
/* The input encrypted as though 128bit counter mode is being /* The input encrypted as though 128bit counter mode is being
* used. The extra state information to record how much of the * used. The extra state information to record how much of the
* 128bit block we have used is contained in *num; * 128bit block we have used is contained in *num, and the
* encrypted counter is kept in ecount_buf. Both *num and
* ecount_buf must be initialised with zeros before the first
* call to AES_ctr128_encrypt().
*/ */
void AES_ctr128_encrypt(const unsigned char *in, unsigned char *out, void AES_ctr128_encrypt(const unsigned char *in, unsigned char *out,
const unsigned long length, const AES_KEY *key, const unsigned long length, const AES_KEY *key,
@ -102,6 +105,7 @@ void AES_ctr128_encrypt(const unsigned char *in, unsigned char *out,
unsigned long l=length; unsigned long l=length;
assert(in && out && key && counter && num); assert(in && out && key && counter && num);
assert(*num < AES_BLOCK_SIZE);
n = *num; n = *num;