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Determine MBEDTLS_ECP_MAX_BITS automatically

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MBEDTLS_ECP_MAX_BITS is now determined automatically from the configured
curves and no longer needs to be configured explicitly to save RAM. Setting
it explicit in config.h is still supported for backward compatibility.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2021-06-02 23:34:02 +02:00
parent e57bad4b42
commit 33c92f01a0
5 changed files with 15 additions and 7 deletions
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2
include/mbedtls/config.h
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@@ -3616,7 +3616,7 @@
//#define MBEDTLS_HMAC_DRBG_MAX_SEED_INPUT 384 /**< Maximum size of (re)seed buffer */
/* ECP options */
//#define MBEDTLS_ECP_MAX_BITS 521 /**< Maximum bit size of groups */
//#define MBEDTLS_ECP_MAX_BITS 521 /**< Maximum bit size of groups. Normally determined automatically from the configured curves. */
//#define MBEDTLS_ECP_WINDOW_SIZE 6 /**< Maximum window size used */
//#define MBEDTLS_ECP_FIXED_POINT_OPTIM 1 /**< Enable fixed-point speed-up */

10
include/mbedtls/ecp.h
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@@ -285,11 +285,17 @@ mbedtls_ecp_group;
#error "MBEDTLS_ECP_MAX_BITS is smaller than the largest supported curve"
#endif
#else
#elif defined(MBEDTLS_ECP_C)
/**
* The maximum size of the groups, that is, of \c N and \c P.
*/
#define MBEDTLS_ECP_MAX_BITS 521 /**< The maximum size of groups, in bits. */
#define MBEDTLS_ECP_MAX_BITS MBEDTLS_ECP_MAX_BITS_MIN
#else
/* MBEDTLS_ECP_MAX_BITS is not relevant without MBEDTLS_ECP_C, but set it
* to a nonzero value so that code that unconditionally allocates an array
* of a size based on it keeps working if built without ECC support. */
#define MBEDTLS_ECP_MAX_BITS 1
#endif
#define MBEDTLS_ECP_MAX_BYTES ( ( MBEDTLS_ECP_MAX_BITS + 7 ) / 8 )