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SourceVuESP-IDF Framework and ExamplesmbedTLSmbedtls_mpi_core_cond_assign()

mbedtls_mpi_core_cond_assign() function

Perform a safe conditional copy of an MPI which doesn't reveal whether assignment was done or not.

Syntax

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Summary

Declaration

Definition

from bignum_core.h:197

void mbedtls_mpi_core_cond_assign(mbedtls_mpi_uint *X, const mbedtls_mpi_uint *A, size_t limbs, mbedtls_ct_condition_t assign);

Implemented in bignum_core.c:168

Arguments

Argument

Description

The address of the destination MPI. This must be initialized. Must have enough limbs to store the full value of \p A.

The address of the source MPI. This must be initialized.

limbs

The number of limbs of \p A.

assign

The condition deciding whether to perform the assignment or not. Callers will need to use the constant time interface (e.g. `mbedtls_ct_bool()`) to construct this argument.

Notes

This function avoids leaking any information about whether the assignment was done or not.

References

Code

Location

Referrer

void mbedtls_mpi_core_cond_assign(mbedtls_mpi_uint *X,

bignum_core.c:168

void mbedtls_mpi_core_cond_assign(mbedtls_mpi_uint *X,

bignum_core.h:197

mbedtls_mpi_core_cond_assign(X->p, Y->p, Y->n, do_assign);

bignum.c:131

mbedtls_mpi_safe_cond_assign()

mbedtls_mpi_core_cond_assign(dest, table, limbs, assign);

bignum_core.c:605

mbedtls_mpi_core_ct_uint_table_lookup()

Call Tree

mbedtls_mpi_core_cond_assign() is called by 2 functions and calls 1 function:

mbedtls_mpi_core_ct_uint_table_lookup()

mbedtls_mpi_safe_cond_assign()

mbedtls_mpi_core_cond_assign()

mbedtls_ct_mpi_uint_if()

Data Use

mbedtls_mpi_core_cond_assign():

mbedtls_mpi_core_cond_assign()

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