An example of configuring libgit2 on iOS to use the root CA cert for GitHub

libgit2certs.m

#import <git2/common.h>
    
NSString *const CACertificateFile_DigiCert = @"DigiCert High Assurance EV Root CA.pem";
NSString *const certFilePath = [[NSBundle mainBundle].bundlePath stringByAppendingPathComponent:CACertificateFile_DigiCert];
NSLog(@"Loading certificate: %@", certFilePath);

const char *file = certFilePath.UTF8String;
const char *path = NULL;

int returnValue = git_libgit2_opts(GIT_OPT_SET_SSL_CERT_LOCATIONS, file, path);
if (returnValue != 0) {
    NSLog(@"Error setting SSL certificate location");
}

Thank you! I just wanted to point out to those that don't know what a .pem is; it is a base64 encoded file that usually starts with ----BEGIN. In my case I downloaded the "DigiCert High Assurance EV Root CA" crt, from https://www.digicert.com/digicert-root-certificates.htm, and ran the following command to convert it to a .pem file:

$ openssl x509 -inform DER -outform PEM -in DigiCertHighAssuranceEVRootCA.crt -out DigiCertHighAssuranceEVRootCA.pem

Thank you very much 😄