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Add comment on how mbedtls_gcm_context::buf data depends on

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values of add_len and len.

Signed-off-by: Mateusz Starzyk <mateusz.starzyk@mobica.com>
This commit is contained in:
Mateusz Starzyk 2021-06-07 15:44:18 +02:00
parent 333f48f407
commit b45b57eec6
1 changed files with 10 additions and 1 deletions
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11
library/gcm.c
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@ -332,7 +332,16 @@ int mbedtls_gcm_starts( mbedtls_gcm_context *ctx,
return( 0 );
}
/**
* mbedtls_gcm_context::buf contains different data type, depending
* on the values of mbedtls_gcm_context::::add_len and
* mbedtls_gcm_context::len:
* * When add_len % 16 == 0 and len == 0: initial state.
* * When add_len % 16 != 0 and len == 0: the first `add_len % 16` bytes
* of buf have a partial AD block xored in and not yet multiplied in.
* * When len != 0: the first `add_len % 16` bytes of buf have partial
* ciphertext xored in and not yet multiplied in.
*/
int mbedtls_gcm_update_ad( mbedtls_gcm_context *ctx,
const unsigned char *add, size_t add_len )
{