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Improve documentation of nonce-generating function in ssl_msg.c

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Signed-off-by: Hanno Becker <hanno.becker@arm.com>
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Hanno Becker 2020-06-04 13:31:46 +01:00
parent 1cda2667af
commit 15952814d8
1 changed files with 6 additions and 0 deletions
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6
library/ssl_msg.c
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@ -557,8 +557,14 @@ static int ssl_transform_aead_dynamic_iv_is_explicit(
* a) Fixed and dynamic IV lengths add up to total IV length, giving * a) Fixed and dynamic IV lengths add up to total IV length, giving
* IV = fixed_iv || dynamic_iv * IV = fixed_iv || dynamic_iv
* *
* This variant is used in TLS 1.2 when used with GCM or CCM.
*
* b) Fixed IV lengths matches total IV length, giving * b) Fixed IV lengths matches total IV length, giving
* IV = fixed_iv XOR ( 0 || dynamic_iv ) * IV = fixed_iv XOR ( 0 || dynamic_iv )
*
* This variant occurs in TLS 1.3 and for TLS 1.2 when using ChaChaPoly.
*
* See also the documentation of mbedtls_ssl_transform.
*/ */
static void ssl_build_record_nonce( unsigned char *dst_iv, static void ssl_build_record_nonce( unsigned char *dst_iv,
size_t dst_iv_len, size_t dst_iv_len,