How to properly verify the client's public key and proof?

[butaikis]

Hi. Please tell me, I have a problem with the M3 stage.
I receive a public key and a proof from TLV8 from the client. How do I extract them correctly and check them on the server side?

        tlv_t tlv_public_key = HAP_TLV8_Get_Val(kTLVType_PublicKey, request.data_only, request.data_len);
        tlv_t tlv_proof = HAP_TLV8_Get_Val(kTLVType_Proof, request.data_only, request.data_len);


        mbedtls_mpi *p = (mbedtls_mpi*)malloc(sizeof(mbedtls_mpi));
        mbedtls_mpi_init(p);
        mbedtls_mpi_read_binary(p, tlv_public_key.data, tlv_public_key.size);
        
        mbedtls_mpi *pr = (mbedtls_mpi*)malloc(sizeof(mbedtls_mpi));
        mbedtls_mpi_init(pr);
        mbedtls_mpi_read_binary(pr, tlv_proof.data, tlv_proof.size);
        

        srp_compute_key(srp_server, p);
        int res_verify = srp_verify_key(srp_server, pr);
        if (res_verify)
        {
            debug("Server failed to validate Client");
        }
        else
            debug("Verify client OK");