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MPI_ECP_COND_NEG macro
Syntax
#define MPI_ECP_COND_NEG(X, cond) \
do \
{ \
unsigned char nonzero = mbedtls_mpi_cmp_int((X), 0) != 0; \
MBEDTLS_MPI_CHK(mbedtls_mpi_sub_mpi(&tmp, &grp->P, (X))); \
MBEDTLS_MPI_CHK(mbedtls_mpi_safe_cond_assign((X), &tmp, \
nonzero & cond)); \
} while (0)