Commit 4006c560 authored by Richard Levitte's avatar Richard Levitte
Browse files

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

parent 17295884

crypto/aes/aes_ctr.c

+5 −1
Original line number Original line Diff line number Diff line
@@ -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;