static CK_RV prvInitAESCMAC()

in source/portable/mbedtls/core_pkcs11_mbedtls.c [3900:3961]
54 lines of code
7 McCabe index (conditional complexity)

static CK_RV prvInitAESCMAC( P11Session_t * pxSession,
                             CK_OBJECT_HANDLE hKey,
                             CK_BYTE_PTR pucKeyData,
                             CK_ULONG ulKeyDataLength )
{
    CK_RV xResult = CKR_OK;
    int32_t lMbedTLSResult = -1;
    const mbedtls_cipher_info_t * pxCipherInfo = NULL;
    size_t ulKeyDataBitLength = 8UL * ulKeyDataLength;

    mbedtls_cipher_init( &pxSession->xCMACSecretContext );
    pxCipherInfo = mbedtls_cipher_info_from_type( MBEDTLS_CIPHER_AES_128_ECB );

    if( pxCipherInfo == NULL )
    {
        LogError( ( "Failed to initialize AES-CMAC operation. "
                    "mbedtls_cipher_info_from_type failed. Consider "
                    "double checking the mbedtls_md_type_t object "
                    "that was used." ) );
        xResult = CKR_FUNCTION_FAILED;
        prvCMACCleanUp( pxSession );
    }

    if( xResult == CKR_OK )
    {
        lMbedTLSResult = mbedtls_cipher_setup( &pxSession->xCMACSecretContext,
                                               pxCipherInfo );

        if( lMbedTLSResult != 0 )
        {
            LogError( ( "Failed to initialize AES-CMAC operation. "
                        "mbedtls_cipher_setup failed: mbed TLS error = %s : %s.",
                        mbedtlsHighLevelCodeOrDefault( lMbedTLSResult ),
                        mbedtlsLowLevelCodeOrDefault( lMbedTLSResult ) ) );
            prvCMACCleanUp( pxSession );
            xResult = CKR_KEY_HANDLE_INVALID;
        }
    }

    if( xResult == CKR_OK )
    {
        lMbedTLSResult = mbedtls_cipher_cmac_starts( &pxSession->xCMACSecretContext,
                                                     pucKeyData, ulKeyDataBitLength );

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

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

    return xResult;
}