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Add notes to the documentation about CMAC_ALT algorithm support

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Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
This commit is contained in:
Steven Cooreman 2021-04-26 11:24:44 +02:00
parent 91e2bab7fb
commit 5d342bf3f8
2 changed files with 16 additions and 0 deletions
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11
include/mbedtls/cmac.h
View file

@ -77,6 +77,12 @@ struct mbedtls_cmac_context_t
* the input data.
* Must be called with an initialized cipher context.
*
* \note When the CMAC implementation is supplied by an alternate
* implementation (through #MBEDTLS_CMAC_ALT), some ciphers
* may not be supported by that implementation, and thus
* return an error. Alternate implementations must support
* AES-128 and AES-256, and may support AES-192 and 3DES.
*
* \param ctx The cipher context used for the CMAC operation, initialized
* as one of the following types: MBEDTLS_CIPHER_AES_128_ECB,
* MBEDTLS_CIPHER_AES_192_ECB, MBEDTLS_CIPHER_AES_256_ECB,
@ -154,6 +160,11 @@ int mbedtls_cipher_cmac_reset( mbedtls_cipher_context_t *ctx );
* The CMAC result is calculated as
* output = generic CMAC(cmac key, input buffer).
*
* \note When the CMAC implementation is supplied by an alternate
* implementation (through #MBEDTLS_CMAC_ALT), some ciphers
* may not be supported by that implementation, and thus
* return an error. Alternate implementations must support
* AES-128 and AES-256, and may support AES-192 and 3DES.
*
* \param cipher_info The cipher information.
* \param key The CMAC key.

5
include/mbedtls/config.h
View file

@ -2631,6 +2631,11 @@
* Enable the CMAC (Cipher-based Message Authentication Code) mode for block
* ciphers.
*
* \note When #MBEDTLS_CMAC_ALT is active, meaning that the underlying
* implementation of the CMAC algorithm is provided by an alternate
* implementation, that alternate implementation may opt to not support
* AES-192 or 3DES as underlying block ciphers for the CMAC operation.
*
* Module: library/cmac.c
*
* Requires: MBEDTLS_AES_C or MBEDTLS_DES_C