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Comment on hardcoding of maximum HKDF key expansion of 255 Bytes

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Signed-off-by: Hanno Becker <hanno.becker@arm.com>
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Hanno Becker
2020-09-16 09:45:27 +01:00
parent 61baae7c9f
commit 531fe3054c
2 changed files with 14 additions and 2 deletions
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7
library/ssl_tls13_keys.h
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@ -71,7 +71,12 @@ extern const struct mbedtls_ssl_tls1_3_labels_struct mbedtls_ssl_tls1_3_labels;
MBEDTLS_MD_MAX_SIZE
/* Maximum desired length for expanded key material generated
* by HKDF-Expand-Label. */
* by HKDF-Expand-Label.
*
* Warning: If this ever needs to be increased, the implementation
* ssl_tls1_3_hkdf_encode_label() in ssl_tls13_keys.c needs to be
* adjusted since it currently assumes that HKDF key expansion
* is never used with more than 255 Bytes of output. */
#define MBEDTLS_SSL_TLS1_3_KEY_SCHEDULE_MAX_EXPANSION_LEN 255
/**