iOS: How to create PKCS12 (P12) keystore from private key and x509certificate in application programmatically?

Question

This question was apparently similar but had no answers of any kind: Programmatically create a x509 certificate for iPhone without using OpenSSL

In our application (

Answer 1

Problem solved! Thank you, guys.

The p12 file now is created correctly.

The code now is:

NSString *certPem = [certificate pemCertificate];
[certPem writeToFile:[self certFilePath] atomically:YES encoding:NSUTF8StringEncoding error:nil];

const char *cert_chars = [certPem cStringUsingEncoding:NSUTF8StringEncoding];

BIO *buffer = BIO_new(BIO_s_mem());
BIO_puts(buffer, cert_chars);

X509 *cert;
cert = PEM_read_bio_X509(buffer, NULL, 0, NULL);
if (cert == NULL) {
    NSLog(@"error");
}
X509_print_fp(stdout, cert);

if (!X509_check_private_key(cert, [certificate privateKey])) {
    NSLog(@"PK error");
}

PKCS12 *p12;

SSLeay_add_all_algorithms();
ERR_load_crypto_strings();


p12 = PKCS12_create("passPhrase", "iOSMobileCertificate", [certificate privateKey], cert, NULL, 0,0,0,0,0);
if(!p12) {
    fprintf(stderr, "Error creating PKCS#12 structure\n");
    ERR_print_errors_fp(stderr);
    exit(1);
}

[self saveP12File:p12];

saveP12File is:

//create empty file
NSString *p12FilePath = [self p12FilePath];
if (![[NSFileManager defaultManager] createFileAtPath:p12FilePath contents:nil attributes:nil])
{
    NSLog(@"Error creating file for P12");
    @throw [[NSException alloc] initWithName:@"Fail getP12File" reason:@"Fail Error creating file for P12" userInfo:nil];
}

//get a FILE struct for the P12 file
NSFileHandle *outputFileHandle = [NSFileHandle fileHandleForWritingAtPath:p12FilePath];
FILE *p12File = fdopen([outputFileHandle fileDescriptor], "w");

i2d_PKCS12_fp(p12File, p12);
PKCS12_free(p12);
fclose(p12File);

And p12FilePath is:

NSString *documentsFolder = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
return [documentsFolder stringByAppendingPathComponent:@"CERT.p12"];

Thank you!