Objective-C

RSA Sign Using Private Key from .pfx/.p12 to Base64 Signature

See more RSA Examples

Demonstrates how to RSA sign something using a private key loaded from a .pfx/.p12. The RSA signature is returned in Base64 encoded format. Objective-C

#import <CkoRsa.h>
#import <CkoPfx.h>
#import <CkoPrivateKey.h>
#import <NSString.h>

BOOL success = NO;

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

CkoRsa *rsa = [[CkoRsa alloc] init];

// Load the .pfx/.p12
CkoPfx *pfx = [[CkoPfx alloc] init];
success = [pfx LoadPfxFile: @"qa_data/pfx/myKey.p12" password: @"myPassword"];
if (success == NO) {
    NSLog(@"%@",pfx.LastErrorText);
    return;
}

// Get the default private key.

CkoPrivateKey *privKey = [[CkoPrivateKey alloc] init];
success = [pfx PrivateKeyAt: [NSNumber numberWithInt: 0] privKey: privKey];
if (success == NO) {
    NSLog(@"%@",pfx.LastErrorText);
    return;
}

// Import the private key into the RSA component:
success = [rsa UsePrivateKey: privKey];
if (success == NO) {
    NSLog(@"%@",rsa.LastErrorText);
    return;
}

// Get the signature in base64
rsa.EncodingMode = @"base64";

NSString *strData = @"This is the string to be signed.";

// Sign the string using the sha256 hash algorithm.
// Other valid choices are "sha384", "sha512", "sha-1", "md2" and "md5".
NSString *base64Sig = [rsa SignStringENC: strData hashAlg: @"sha256"];

NSLog(@"%@",base64Sig);

NSLog(@"%@",@"Success!");