lib/mbedtls
1
0
Fork 0
mirror of https://github.com/Mbed-TLS/mbedtls.git synced 2025-07-30 22:43:08 +03:00
Code Activity

Increase allowed output size of HKDF-Expand-Label

Browse Source 
Signed-off-by: Max Fillinger <maximilian.fillinger@foxcrypto.com>
This commit is contained in:
Max Fillinger
2024-10-29 18:49:30 +01:00
parent cf007ca8bb
commit 28916ac8fe
3 changed files with 11 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
library/ssl_tls13_keys.c
View File

@ -107,15 +107,13 @@ static void ssl_tls13_hkdf_encode_label(
unsigned char *p = dst;
/* Add the size of the expanded key material.
* We're hardcoding the high byte to 0 here assuming that we never use
* TLS 1.3 HKDF key expansion to more than 255 Bytes. */
#if MBEDTLS_SSL_TLS1_3_KEY_SCHEDULE_MAX_EXPANSION_LEN > 255
#error "The implementation of ssl_tls13_hkdf_encode_label() is not fit for the \
value of MBEDTLS_SSL_TLS1_3_KEY_SCHEDULE_MAX_EXPANSION_LEN"
/* Add the size of the expanded key material. */
#if MBEDTLS_SSL_TLS1_3_KEY_SCHEDULE_MAX_EXPANSION_LEN > UINT16_MAX
#error "The desired key length must fit into an uint16 but \
MBEDTLS_SSL_TLS1_3_KEY_SCHEDULE_MAX_EXPANSION_LEN is greater than UINT16_MAX"
#endif
*p++ = 0;
*p++ = MBEDTLS_BYTE_1(desired_length);
*p++ = MBEDTLS_BYTE_0(desired_length);
/* Add label incl. prefix */