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ecp: Add support for hardware implementation of ECP routines

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- ESP32C2 has a hardware ECC accelerator that supports NIST P-192 and NIST P-256 curves,
    which can increase the performance of the point multiplication and point
    verification operation.
  - Provision is also added to fallback to software implementation in
    case the curve is not from the supported curves

- Override ecp_mul_restartable_internal with accelerator
  - Many ECC operations use the internal API ecp_mul_restartable_internal
    instead of the public API mbedtls_ecp_mul for point multiplication.
    This will improve the performance of all those parent operations as
    well

(cherry picked from commit 0ecb27b9d88059e8980c8ae6e111283f5f2859f8)
This commit is contained in:
Sachin Parekh 2022-01-05 15:23:44 +05:30 committed by harshal.patil
parent bd44e815e3
commit 4d0c5f8603
1 changed files with 31 additions and 0 deletions
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31
library/ecp.c
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@ -1354,6 +1354,7 @@ cleanup:
#endif /* !defined(MBEDTLS_ECP_NO_FALLBACK) || !defined(MBEDTLS_ECP_NORMALIZE_JAC_ALT) */
}
#if !defined(MBEDTLS_ECP_MUL_ALT)
/*
* Normalize jacobian coordinates of an array of (pointers to) points,
* using Montgomery's trick to perform only one inversion mod P.
@ -1476,6 +1477,7 @@ cleanup:
mbedtls_mpi_free(&tmp);
return ret;
}
#endif /* MBEDTLS_ECP_MUL_ALT */
/*
* Point doubling R = 2 P, Jacobian coordinates
@ -1679,6 +1681,7 @@ cleanup:
#endif /* !defined(MBEDTLS_ECP_NO_FALLBACK) || !defined(MBEDTLS_ECP_ADD_MIXED_ALT) */
}
#if !defined(MBEDTLS_ECP_MUL_ALT)
/*
* Randomize jacobian coordinates:
* (X, Y, Z) -> (l^2 X, l^3 Y, l Z) for random l
@ -2413,6 +2416,8 @@ cleanup:
return ret;
}
#endif /* MBEDTLS_ECP_MUL_ALT */
#endif /* MBEDTLS_ECP_SHORT_WEIERSTRASS_ENABLED */
#if defined(MBEDTLS_ECP_MONTGOMERY_ENABLED)
@ -2424,6 +2429,7 @@ cleanup:
* For scalar multiplication, we'll use a Montgomery ladder.
*/
#if !defined(MBEDTLS_ECP_MUL_ALT)
/*
* Normalize Montgomery x/z coordinates: X = X/Z, Z = 1
* Cost: 1M + 1I
@ -2623,18 +2629,27 @@ cleanup:
return ret;
}
#endif /* MBEDTLS_ECP_MUL_ALT */
#endif /* MBEDTLS_ECP_MONTGOMERY_ENABLED */
#if !defined(MBEDTLS_ECP_MUL_ALT)
/*
* Restartable multiplication R = m * P
*
* This internal function can be called without an RNG in case where we know
* the inputs are not sensitive.
*/
#if defined(MBEDTLS_ECP_MUL_ALT_SOFT_FALLBACK)
int ecp_mul_restartable_internal_soft(mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
const mbedtls_mpi *m, const mbedtls_ecp_point *P,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
mbedtls_ecp_restart_ctx *rs_ctx)
#else
static int ecp_mul_restartable_internal(mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
const mbedtls_mpi *m, const mbedtls_ecp_point *P,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
mbedtls_ecp_restart_ctx *rs_ctx)
#endif
{
int ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
#if defined(MBEDTLS_ECP_INTERNAL_ALT)
@ -2698,6 +2713,7 @@ cleanup:
return ret;
}
#endif /* MBEDTLS_ECP_MUL_ALT */
/*
* Restartable multiplication R = m * P
@ -2724,7 +2740,10 @@ int mbedtls_ecp_mul(mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
return mbedtls_ecp_mul_restartable(grp, R, m, P, f_rng, p_rng, NULL);
}
#if !defined(MBEDTLS_ECP_VERIFY_ALT)
#if defined(MBEDTLS_ECP_SHORT_WEIERSTRASS_ENABLED)
/*
* Check that an affine point is valid as a public key,
* short weierstrass curves (SEC1 3.2.3.1)
@ -2762,6 +2781,7 @@ cleanup:
return ret;
}
#endif /* MBEDTLS_ECP_SHORT_WEIERSTRASS_ENABLED */
#endif /* MBEDTLS_ECP_VERIFY_ALT */
#if defined(MBEDTLS_ECP_SHORT_WEIERSTRASS_ENABLED)
/*
@ -2915,6 +2935,8 @@ int mbedtls_ecp_muladd(mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
}
#endif /* MBEDTLS_ECP_SHORT_WEIERSTRASS_ENABLED */
#if !defined(MBEDTLS_ECP_VERIFY_ALT)
#if defined(MBEDTLS_ECP_MONTGOMERY_ENABLED)
#if defined(MBEDTLS_ECP_DP_CURVE25519_ENABLED)
#define ECP_MPI_INIT(s, n, p) { s, (n), (mbedtls_mpi_uint *) (p) }
@ -3026,11 +3048,19 @@ static int ecp_check_pubkey_mx(const mbedtls_ecp_group *grp, const mbedtls_ecp_p
}
#endif /* MBEDTLS_ECP_MONTGOMERY_ENABLED */
#endif /* MBEDTLS_ECP_VERIFY_ALT */
#if !defined(MBEDTLS_ECP_VERIFY_ALT)
/*
* Check that a point is valid as a public key
*/
#if defined(MBEDTLS_ECP_VERIFY_ALT_SOFT_FALLBACK)
int mbedtls_ecp_check_pubkey_soft(const mbedtls_ecp_group *grp,
const mbedtls_ecp_point *pt)
#else
int mbedtls_ecp_check_pubkey(const mbedtls_ecp_group *grp,
const mbedtls_ecp_point *pt)
#endif
{
/* Must use affine coordinates */
if (mbedtls_mpi_cmp_int(&pt->Z, 1) != 0) {
@ -3049,6 +3079,7 @@ int mbedtls_ecp_check_pubkey(const mbedtls_ecp_group *grp,
#endif
return MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
}
#endif /* MBEDTLS_ECP_VERIFY_ALT */
/*
* Check that an mbedtls_mpi is valid as a private key