Objective-C

Generate new DSA Key from OpenSSL Parameters File

See more DSA Examples

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

Objective-C

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

BOOL success = NO;

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

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

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!");