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Adjust AES RAM usage according to config options

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Do not reserve additionl space for mbedtls_aes_context if config
option AES_ONLY_128_BIT_KEY_LENGTH is used and PADLOCK_C is not used.
This reduces RAM usage by 96 bytes.

In baremetal configuration reserve space for 10 128-bit keys in order
to save 112 bytes of heap.
This commit is contained in:
Arto Kinnunen 2019-10-21 09:27:55 +03:00
parent 5bdafa21e0
commit 5ed870da72
1 changed files with 4 additions and 0 deletions
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4
include/mbedtls/aes.h
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@ -87,6 +87,9 @@ typedef struct mbedtls_aes_context
{ {
int nr; /*!< The number of rounds. */ int nr; /*!< The number of rounds. */
uint32_t *rk; /*!< AES round keys. */ uint32_t *rk; /*!< AES round keys. */
#if defined(MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH) && !defined(MBEDTLS_PADLOCK_C)
uint32_t buf[44]; /*!< Unaligned data buffer */
#else /* MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH */
uint32_t buf[68]; /*!< Unaligned data buffer. This buffer can uint32_t buf[68]; /*!< Unaligned data buffer. This buffer can
hold 32 extra Bytes, which can be used for hold 32 extra Bytes, which can be used for
one of the following purposes: one of the following purposes:
@ -95,6 +98,7 @@ typedef struct mbedtls_aes_context
<li>Simplifying key expansion in the 256-bit <li>Simplifying key expansion in the 256-bit
case by generating an extra round key. case by generating an extra round key.
</li></ul> */ </li></ul> */
#endif /* MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH */
} }
mbedtls_aes_context; mbedtls_aes_context;