Cryptography for Intel(R) Integrated Performance Primitives Developer Reference

ID 768738
Date 12/16/2022
Public
Document Table of Contents

mbx_nistp256/384/521_ecdh

Computes a shared secret.

Syntax

mbx_status mbx_sm2_ecdh_mb8(int8u* pa_shared_key[8], const int64u* const pa_skey[8], const int64u* const pa_pubx[8], const int64u* const pa_puby[8], const int64u* const pa_pubz[8], int8u* pBuffer);

mbx_status mbx_sm2_ecdh_ssl_mb8(int8u* pa_shared_key[8], const BIGNUM* const pa_skey[8], const BIGNUM* const pa_pubx[8], const BIGNUM* const pa_puby[8], const BIGNUM* const pa_pubz[8], int8u* pBuffer);

Include Files

crypto_mb/ec_sm2.h

Parameters

pa_shared_key

Array of pointers to the vectors of computed shared secret values.

pa_pubx

Array of pointers to the vectors of party's public key x-coordinates.

pa_puby

Array of pointers to the vectors of party's public key y-coordinates.

pa_pubz

Array of pointers to the vectors of party's public key z-coordinates

pa_skey

Array of pointers to the vectors of own private keys.

pBuffer

Pointer to the work buffer.
Description

The function computes a shared secret value using own private keys specified by the pa_skey parameter and the party's public key specified by pa_pubx, pa_puby, and pa_pubz parameters. If the pa_pubz parameter is not NULL, then it is assumed that party's public keys are represented in projective coordinates. If the pa_pubz parameter is NULL, then party's public keys are considered in affine coordinates.

The work buffer specified by the pBuffer parameter is not currently used and can be NULL.

NOTE:

The function above has own "twin" with "_ssl" in the name. The only difference in comparison with mbx_sm2_ecdh() is representation of the parameters. mbx_sm2_ecdh_ssl() functions use BIGNUM datatype instead of vector.

Return Values

The mbx_sm2_ecdh function returns the status that indicates whether the operation completed successfully or not. The status value of 0 indicates that all operations completed successfully. The error condition can be analyzed by the MBX_GET_STS() call.

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