memory_consumption_by_function.adoc

The table below was the total heap memory allocated by function. This did not include the local stack storage and did not include the code size. The code size was static and that could be figured out from the object files, or from the compiled binary.

We measured incremental heap memory usage by intercepting calls to malloc() using LD_PRELOAD.

This was tested on Linux on an x86 architecture with version 0.1-052220 (opensource) of libcertifier.

Source File	Function	Function Description	Bytes	Kb	Arch	Notes
openssl.c	load_certs_from_pkcs7	This function takes in a PKCS7 PEM (from Certifier) and returns an X509_LIST structure (3 elements). The code parses the certificate.	45996	46	x86
openssl.c	security_find_or_create_keys	Generates an ECC keypair	8340	8	x86
openssl.c	security_persist_pkcs_12_file	Persists PKCS12 file	28554	28.554	x86
security.c	security_generate_certificate_signing_request	Generates the certificate signing request (CSR). The output is a base64 encoded string.	4780	5	x86	OpenSSL
certifierclient.c	certifierclient_request_x509_certificate	Makes an HTTPS call to Certifier for requesting an X509 certificate. Parameters are a b64 encoded CSR, node address, certifier id and other parameters. This returns the X509 PEM certificate.	3328618	3328.618	x86	OpenSSL