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Objective-C Examples

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(Objective-C) Generate RSA Key and Export to PKCS1 / PKCS8

Objective-C example code showing how to generate an RSA public/private key and save to PKCS1 and PKCS8 format files. In a PKCS1 or PKCS8 formatted file, the key is stored in binary ASN.1 format (and ASN.1 is itself written according to DER -- Distinguished Encoding Rules). A PEM file simply contains the binary ASN.1 base64 encoded and delimited by BEGIN/END lines. PKCS1 format files are never encrypted. PKCS8 can be encrypted or unencrypted. Public keys are never encrypted (there is no need). Private keys *should* always be encrypted - unless perhaps the unencrypted private key is obtained and itself stored in some sort of secure place.

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MAC OS X (Cocoa) Libs

iOS Libs

#import "CkoRsa.h"
#import "CkoPublicKey.h"
#import "CkoPrivateKey.h"
#import "NSString.h"



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

BOOL success = [rsa UnlockComponent: @"Anything for 30-day trial"];
if (success != YES) {
    NSLog(@"%@",rsa.LastErrorText);
    return;
}

//  Generate a 2048-bit key.  Chilkat RSA supports
//  key sizes ranging from 512 bits to 8192 bits.
success = [rsa GenerateKey: [NSNumber numberWithInt: 2048]];
if (success != YES) {
    NSLog(@"%@",rsa.LastErrorText);
    return;
}

//  Get the public and private key parts:
CkoPublicKey *pubKey = [rsa ExportPublicKeyObj];
CkoPrivateKey *privKey = [rsa ExportPrivateKeyObj];

//  Get the public key as a PKCS8 PEM string
NSString *pubKeyPem = [pubKey GetOpenSslPem];
NSLog(@"%@",pubKeyPem);

//  Get the public key in PKCS8 format, in a Base64 encoded string.
NSString *pubKeyPkcs8Base64 = [pubKey GetPkcs8ENC: @"base64"];
NSLog(@"%@",pubKeyPkcs8Base64);

//  Get the public key in PKCS1 format, in a Base64 encoded string.
NSString *pubKeyPkcs1Base64 = [pubKey GetPkcs1ENC: @"base64"];
NSLog(@"%@",pubKeyPkcs1Base64);

//  Get the private key in a PKCS8 PEM string.
NSString *privKeyPem = [privKey GetPkcs8Pem];
NSLog(@"%@",privKeyPem);

//  Get the private key in a PKCS8 encrypted PEM string.
NSString *privKeyEncPem = [privKey GetPkcs8EncryptedPem: @"myPassword"];
NSLog(@"%@",privKeyEncPem);

//  Get the private key in PKCS1 Base64 format
NSString *privKeyPkcs1Base64 = [privKey GetPkcs1ENC: @"base64"];
NSLog(@"%@",privKeyPkcs1Base64);

//  Get the private key in PKCS8 Base64 format
NSString *privKeyPkcs8Base64 = [privKey GetPkcs8ENC: @"base64"];
NSLog(@"%@",privKeyPkcs8Base64);

//  Save to PKCS1 / PKCS8 / PEM files...

//  Save the public key to PKCS8 binary DER
//  Note: Chilkat is confusingly using the substring "OpenSsl" in the method name.
//  A better choice would've been "SavePkcs8DerFile". When you see "OpenSsl" referring to
//  a key format in a Chilkat method name, assume "PKCS8".
success = [pubKey SaveOpenSslDerFile: @"pubKey_pkcs8.der"];

//  Save the public key to PKCS1 binary DER
success = [pubKey SaveRsaDerFile: @"pubKey_pkcs1.der"];

//  Save the private key to unencrypted binary PKCS1 DER.
//  Note: PKCS1 is never found in an encrypted format.
success = [privKey SaveRsaDerFile: @"privKey_pkcs1.der"];

//  Save the private key to unencrypted binary PKCS8
success = [privKey SavePkcs8File: @"privKey_pkcs8.der"];

//  Save the private key to encrypted binary PKCS8
success = [privKey SavePkcs8EncryptedFile: @"myPassword" path: @"privKey_enc_pkcs8.der"];

//  Save the private key to unencrypted PKCS8 PEM
success = [privKey SavePkcs8PemFile: @"privKey.pem"];

//  Save the private key to encrypted PKCS8 PEM
success = [privKey SavePkcs8EncryptedPemFile: @"myPassword" path: @"privKey_enc.pem"];


 

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