(Objective-C) Generate new DSA Key from OpenSSL Parameters File

Generates a new DSA key from an OpenSSL-created parameters file (DER and PEM formats supported). Examples of using OpenSSL to create parameter files are shown here:

openssl dsaparam -outform DER 1024 <  seedData.txt >dsaparam.der

openssl dsaparam 1024 < seedData.txt >dsaparam.pem

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#import <CkoDsa.h>
#import <NSString.h>

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

CkoDsa *dsa = [[CkoDsa alloc] init];

BOOL success = [dsa GenKeyFromParamsDerFile: @"dsaparam.der"];
if (success != YES) {
    NSLog(@"%@",dsa.LastErrorText);
    return;
}

// To generate a key from PEM, call GenKeyFromParamsPem 
// (for an in-memory PEM string) or GenKeyFromParamsFilePem
// for a PEM file.

// The public and private keys may now be exported to PEM, DER,
// and XML formatted files.

NSString *pemStr = 0;
NSString *xmlStr = 0;

// First for the public key...
// The public key never needs to be encrypted.

// Save the public key in PEM format:
pemStr = [dsa ToPublicPem];
// This example will not check the return value of SaveText...
success = [dsa SaveText: pemStr path: @"dsa_pub.pem"];

// Save the public key in DER format:
success = [dsa ToPublicDerFile: @"dsa_pub.der"];

BOOL bPublicOnly = YES;
// Save to XML
xmlStr = [dsa ToXml: bPublicOnly];
success = [dsa SaveText: pemStr path: @"dsa_pub.xml"];

// ------------------------------------
// Now for the private key....
// ------------------------------------

// Unencrypted PEM:
pemStr = [dsa ToPem];
success = [dsa SaveText: pemStr path: @"dsa_priv.pem"];

// Encrypted PEM:
pemStr = [dsa ToEncryptedPem: @"myPassword"];
success = [dsa SaveText: pemStr path: @"dsa_privEncrypted.pem"];

// DER:
success = [dsa ToDerFile: @"dsa_priv.der"];

// XML:
bPublicOnly = NO;
xmlStr = [dsa ToXml: bPublicOnly];
success = [dsa SaveText: pemStr path: @"dsa_priv.xml"];

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