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(Objective-C) RSA Sign using Base64 Private KeySigns a string using a non-encrypted RSA private key in base64 encoding. Returns the RSA signature as a base64 string. Note: This example requires Chilkat v11.0.0 or greater.
#import <CkoPrivateKey.h> #import <CkoStringBuilder.h> #import <CkoRsa.h> #import <CkoBinData.h> #import <NSString.h> BOOL success = NO; // This requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. CkoPrivateKey *privKey = [[CkoPrivateKey alloc] init]; CkoStringBuilder *sbPem = [[CkoStringBuilder alloc] init]; [sbPem AppendLine: @"-----BEGIN RSA PRIVATE KEY-----" crlf: YES]; [sbPem AppendLine: @"MIIC .... j5A==" crlf: YES]; [sbPem AppendLine: @"-----END RSA PRIVATE KEY-----" crlf: YES]; success = [privKey LoadPem: [sbPem GetAsString]]; if (success == NO) { NSLog(@"%@",privKey.LastErrorText); return; } CkoRsa *rsa = [[CkoRsa alloc] init]; success = [rsa UsePrivateKey: privKey]; if (success == NO) { NSLog(@"%@",rsa.LastErrorText); return; } CkoBinData *bd = [[CkoBinData alloc] init]; [bd AppendString: @"12345678" charset: @"utf-8"]; success = [rsa SignRawBd: bd]; if (success == NO) { NSLog(@"%@",rsa.LastErrorText); return; } // Get the base64 RSA signature. NSLog(@"%@",[bd GetEncoded: @"base64"]); success = [rsa VerifyRawBd: bd]; if (success == NO) { NSLog(@"%@",rsa.LastErrorText); return; } NSString *strOriginal = [bd GetString: @"utf-8"]; NSLog(@"%@",strOriginal); |
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