static CK_RV prvInitSHA256HMAC()

in source/portable/mbedtls/core_pkcs11_mbedtls.c [3798:3859]
54 lines of code
7 McCabe index (conditional complexity)

static CK_RV prvInitSHA256HMAC( P11Session_t * pxSession,
                                CK_OBJECT_HANDLE hKey,
                                CK_BYTE_PTR pucKeyData,
                                CK_ULONG ulKeyDataLength )
{
    CK_RV xResult = CKR_OK;
    int32_t lMbedTLSResult = 0;
    const mbedtls_md_info_t * pxMdInfo = NULL;

    mbedtls_md_init( &pxSession->xHMACSecretContext );
    pxMdInfo = mbedtls_md_info_from_type( MBEDTLS_MD_SHA256 );

    if( pxMdInfo == NULL )
    {
        LogError( ( "Failed to initialize SHA256HMAC operation. "
                    "mbedtls_md_info_from_type failed. Consider "
                    "double checking the mbedtls_md_type_t object "
                    "that was used." ) );
        xResult = CKR_FUNCTION_FAILED;
        prvHMACCleanUp( pxSession );
    }

    if( xResult == CKR_OK )
    {
        lMbedTLSResult = mbedtls_md_setup( &pxSession->xHMACSecretContext,
                                           pxMdInfo,
                                           PKCS11_USING_HMAC );

        if( lMbedTLSResult != 0 )
        {
            LogError( ( "Failed to initialize SHA256HMAC operation. "
                        "mbedtls_md_setup failed: mbed TLS error = %s : %s.",
                        mbedtlsHighLevelCodeOrDefault( lMbedTLSResult ),
                        mbedtlsLowLevelCodeOrDefault( lMbedTLSResult ) ) );
            prvHMACCleanUp( pxSession );
            xResult = CKR_KEY_HANDLE_INVALID;
        }
    }

    if( xResult == CKR_OK )
    {
        lMbedTLSResult = mbedtls_md_hmac_starts( &pxSession->xHMACSecretContext,
                                                 pucKeyData, ulKeyDataLength );

        if( lMbedTLSResult != 0 )
        {
            LogError( ( "Failed to initialize SHA256HMAC operation. "
                        "mbedtls_md_setup failed: mbed TLS error = %s : %s.",
                        mbedtlsHighLevelCodeOrDefault( lMbedTLSResult ),
                        mbedtlsLowLevelCodeOrDefault( lMbedTLSResult ) ) );
            prvHMACCleanUp( pxSession );
            xResult = CKR_KEY_HANDLE_INVALID;
        }
    }

    if( xResult == CKR_OK )
    {
        pxSession->xHMACKeyHandle = hKey;
    }

    return xResult;
}