(Objective-C) SFTP Host Key Fingerprint

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#import <CkoSFtp.h>
#import <NSString.h>

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

CkoSFtp *sftp = [[CkoSFtp alloc] init];

NSString *hostname = @"sftp.example.com";
int port = 22;
BOOL success = [sftp Connect: hostname port: [NSNumber numberWithInt: port]];
if (success != YES) {
    NSLog(@"%@",sftp.LastErrorText);
    return;
}

// Get the classic MD5 fingeprint
NSString *md5_fingerprint = sftp.HostKeyFingerprint;
NSLog(@"%@",md5_fingerprint);

// Sample output:
// ssh-rsa 3072 21:b0:d8:41:4e:ef:78:10:20:af:01:b7:71:5d:eb:94

// Starting in Chilkat v9.5.0.92, we can also get the SHA256 fingerprint.
// (it is also possible to get fingerprints using other hash algorithms such as SHA384, SHA512, etc.)

BOOL includeKeyType = YES;
BOOL includeHashName = YES;
NSString *sha256_fingerprint = [sftp GetHostKeyFP: @"SHA256" includeKeyType: includeKeyType includeHashName: includeHashName];
NSLog(@"%@",sha256_fingerprint);

// Sample output:
// ssh-rsa SHA256:Ufgj480OsdsCZRjj9sSNM6fpgIcSJ61RsIG8usndUIY=

// The key type and hash name can be optionally included or not.
includeKeyType = NO;
includeHashName = YES;
sha256_fingerprint = [sftp GetHostKeyFP: @"SHA256" includeKeyType: includeKeyType includeHashName: includeHashName];
NSLog(@"%@",sha256_fingerprint);

// SHA256:Ufgj480OsdsCZRjj9sSNM6fpgIcSJ61RsIG8usndUIY=

includeKeyType = YES;
includeHashName = NO;
sha256_fingerprint = [sftp GetHostKeyFP: @"SHA256" includeKeyType: includeKeyType includeHashName: includeHashName];
NSLog(@"%@",sha256_fingerprint);

// ssh-rsa Ufgj480OsdsCZRjj9sSNM6fpgIcSJ61RsIG8usndUIY=

includeKeyType = NO;
includeHashName = NO;
sha256_fingerprint = [sftp GetHostKeyFP: @"SHA256" includeKeyType: includeKeyType includeHashName: includeHashName];
NSLog(@"%@",sha256_fingerprint);

// Ufgj480OsdsCZRjj9sSNM6fpgIcSJ61RsIG8usndUIY=