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Add another round in the Koblitz reduction

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The addition can result in an overflow so another round is needed
in the reduction.

Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
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Gabor Mezei
2023-05-02 13:59:57 +02:00
parent e06d863267
commit dcaf99ebb8
1 changed files with 1 additions and 1 deletions
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library/ecp_curves.c
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@@ -5571,7 +5571,7 @@ static inline int ecp_mod_koblitz(mbedtls_mpi_uint *X,
mask = ((mbedtls_mpi_uint) 1 << shift) - 1; mask = ((mbedtls_mpi_uint) 1 << shift) - 1;
} }
for (size_t pass = 0; pass < 2; pass++) { for (size_t pass = 0; pass < 3; pass++) {
/* Copy A1 */ /* Copy A1 */
memcpy(A1, X + P_limbs - adjust, P_limbs * ciL); memcpy(A1, X + P_limbs - adjust, P_limbs * ciL);