Objective-C

DSA Generate Key

See more DSA Examples

Generates a DSA public/private key pair and saves to PEM and DER file formats (both encrypted and non-encrypted).

An encrypted DSA PEM looks like this:

-----BEGIN DSA PRIVATE KEY-----
Proc-Type: 4,ENCRYPTED
DEK-Info: DES-EDE3-CBC,9DAFD5C4CD62A5D0

QwDdp66sB0qKXQli7FbVcKL/eo3wu7kGRlV2sI8XbkNa1RTLiwnwTWDB0dqyWRQ8
...
Bx0HVfxKiNgCbL6BQEnYD+GOmMcckuj9Uhgloe/YuXCIDJBGhjUt/li3hvR/PXeC

V2xxNl1XKBE88njqi+UXt4vjGVNLpvXM
-----END DSA PRIVATE KEY-----

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];

// Call GenKey to generate a new DSA key.
// The number of bits should be at least 1024 and a multiple
// of 64.   Typical values are either 1024 or 2048.
// DSA key generation is compute intensive and may take
// a short while to complete.
success = [dsa GenKey: [NSNumber numberWithInt: 2048]];
if (success != YES) {
    NSLog(@"%@",dsa.LastErrorText);
    return;
}

// Extract the private and public parts to PEM or DER format
// and save to 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: xmlStr 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: xmlStr path: @"dsa_priv.xml"];

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