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ecp: minor simplification in ecp_mod_koblitz()

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Signed-off-by: Manuel Pégourié-Gonnard <[email protected]>
This commit is contained in:
Manuel Pégourié-Gonnard
2026-05-20 13:18:08 +02:00
parent fa157d7d50
commit ba50c86b7f
1 changed files with 5 additions and 10 deletions
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library/ecp_curves.c
+5 -10
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@@ -5733,7 +5733,6 @@ int mbedtls_ecp_mod_p448_raw(mbedtls_mpi_uint *X, size_t X_limbs)
* Write X as A0 + 2^n A1, update as A0 + R * A1.
*/
static inline int ecp_mod_koblitz(mbedtls_mpi_uint *X,
size_t X_limbs,
mbedtls_mpi_uint *R,
size_t bits)
{
@@ -5771,12 +5770,8 @@ static inline int ecp_mod_koblitz(mbedtls_mpi_uint *X,
X[P_limbs - 1] &= mask;
}
/* X = A0
* Zeroize the A1 part of X to keep only the A0 part.
*/
for (size_t i = P_limbs; i < X_limbs; i++) {
X[i] = 0;
}
/* X = A0: Zeroize the A1 part of X to keep only the A0 part. */
memset(X + P_limbs, 0, P_limbs * ciL);
/* X = A0 + R * A1 */
mbedtls_mpi_core_mul(M, A1, P_limbs, R, R_limbs);
@@ -5834,7 +5829,7 @@ int mbedtls_ecp_mod_p192k1_raw(mbedtls_mpi_uint *X, size_t X_limbs)
return MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
}
return ecp_mod_koblitz(X, X_limbs, Rp, 192);
return ecp_mod_koblitz(X, Rp, 192);
}
#endif /* MBEDTLS_ECP_DP_SECP192K1_ENABLED */
@@ -5870,7 +5865,7 @@ int mbedtls_ecp_mod_p224k1_raw(mbedtls_mpi_uint *X, size_t X_limbs)
return MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
}
return ecp_mod_koblitz(X, X_limbs, Rp, 224);
return ecp_mod_koblitz(X, Rp, 224);
}
#endif /* MBEDTLS_ECP_DP_SECP224K1_ENABLED */
@@ -5906,7 +5901,7 @@ int mbedtls_ecp_mod_p256k1_raw(mbedtls_mpi_uint *X, size_t X_limbs)
return MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
}
return ecp_mod_koblitz(X, X_limbs, Rp, 256);
return ecp_mod_koblitz(X, Rp, 256);
}
#endif /* MBEDTLS_ECP_DP_SECP256K1_ENABLED */