From 4006c56036b1a2613acc77ff60c3c71e62aae962 Mon Sep 17 00:00:00 2001 From: Richard Levitte Date: Fri, 11 Oct 2002 22:42:34 +0000 Subject: [PATCH] Add more commentary. Check that *num is smaller than the block size. --- crypto/aes/aes_ctr.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/crypto/aes/aes_ctr.c b/crypto/aes/aes_ctr.c index 6a89f4def2..142ca4a142 100644 --- a/crypto/aes/aes_ctr.c +++ b/crypto/aes/aes_ctr.c @@ -90,7 +90,10 @@ static void AES_ctr128_inc(unsigned char *counter) { /* The input encrypted as though 128bit counter mode is being * 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, 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; assert(in && out && key && counter && num); + assert(*num < AES_BLOCK_SIZE); n = *num; -- 2.25.1