Objective-C

Load RSA Public Key from Hex Modulus and Exponent

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Load an RSA public key from a hex modulus and exponent. Objective-C

#import <NSString.h>
#import <CkoBinData.h>
#import <CkoXml.h>
#import <CkoPublicKey.h>

BOOL success = NO;

// Load a 128-byte (1024-bit) modulus + exponent into a Chilkat public key object..
NSString *modulus = @"BF5F4AF9A018B5F324A0C10448C0D3248D9BE78967FDC551A27876AC5789ADCBA8245D3D942AE3799563D895DA801E765D225A54FA15DAB2C4731DD817DCF94A9AD62197074C2349442093A206234BF3747F0E88AA6F538355684CC1FB26FCE029C9050A1DAF9F507C2BABF6EFC9FB16320C8036721BE0279FBB76122C41E429";

NSString *exponent = @"00000003";

// We'll need to re-encode from hex to base64..
CkoBinData *bdModulus = [[CkoBinData alloc] init];
[bdModulus AppendEncoded: modulus encoding: @"hex"];
CkoBinData *bdExponent = [[CkoBinData alloc] init];
[bdExponent AppendEncoded: exponent encoding: @"hex"];

CkoXml *xml = [[CkoXml alloc] init];
xml.Tag = @"RsaKeyValue";
[xml NewChild2: @"Modulus" content: [bdModulus GetEncoded: @"base64"]];
[xml NewChild2: @"Exponent" content: [bdExponent GetEncoded: @"base64"]];

// Now load into the pubkey object..
CkoPublicKey *pubkey = [[CkoPublicKey alloc] init];
success = [pubkey LoadFromString: [xml GetXml]];
if (success == NO) {
    NSLog(@"%@",pubkey.LastErrorText);
    return;
}

NSLog(@"%@",@"Success.");