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Merge pull request #4315 from Kxuan/feat-pre-compute-tls

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Static initialize comb table
This commit is contained in:
Manuel Pégourié-Gonnard
2021-06-03 11:41:54 +02:00
committed by GitHub
parent 1b1327cc0d 782c2b9f36
commit 84191eab06
7 changed files with 4300 additions and 27 deletions
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9
include/mbedtls/ecp.h
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@ -229,7 +229,7 @@ typedef struct mbedtls_ecp_group
int (*t_post)(mbedtls_ecp_point *, void *); /*!< Unused. */
void *t_data; /*!< Unused. */
mbedtls_ecp_point *T; /*!< Pre-computed points for ecp_mul_comb(). */
size_t T_size; /*!< The number of pre-computed points. */
size_t T_size; /*!< The number of dynamic allocated pre-computed points. */
}
mbedtls_ecp_group;
@ -276,15 +276,16 @@ mbedtls_ecp_group;
#if !defined(MBEDTLS_ECP_FIXED_POINT_OPTIM)
/*
* Trade memory for speed on fixed-point multiplication.
* Trade code size for speed on fixed-point multiplication.
*
* This speeds up repeated multiplication of the generator (that is, the
* multiplication in ECDSA signatures, and half of the multiplications in
* ECDSA verification and ECDHE) by a factor roughly 3 to 4.
*
* The cost is increasing EC peak memory usage by a factor roughly 2.
* For each n-bit Short Weierstrass curve that is enabled, this adds 4n bytes
* of code size if n < 384 and 8n otherwise.
*
* Change this value to 0 to reduce peak memory usage.
* Change this value to 0 to reduce code size.
*/
#define MBEDTLS_ECP_FIXED_POINT_OPTIM 1 /**< Enable fixed-point speed-up. */
#endif /* MBEDTLS_ECP_FIXED_POINT_OPTIM */