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(Objective-C) Duplicate openssl dgst -sha256 -sign private.pem -out sha256.sig in.datDemonstrates how to duplicate this OpenSSL command: openssl dgst -sha256 -sign private.pem -out sha256.sig in.datThe in.dat file can contain text or binary data of any type. The OpenSSL command does the following:
#import <CkoPrivateKey.h> #import <CkoFileAccess.h> #import <CkoRsa.h> // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. BOOL success; CkoPrivateKey *pkey = [[CkoPrivateKey alloc] init]; // Load the private key from an PEM file: success = [pkey LoadPemFile: @"private.pem"]; if (success != YES) { NSLog(@"%@",pkey.LastErrorText); return; } // Load the file to be signed. CkoFileAccess *fac = [[CkoFileAccess alloc] init]; NSData inData = [fac ReadEntireFile: @"in.dat"]; CkoRsa *rsa = [[CkoRsa alloc] init]; // Import the private key into the RSA component: success = [rsa ImportPrivateKeyObj: pkey]; if (success != YES) { NSLog(@"%@",rsa.LastErrorText); return; } // OpenSSL uses big-endian. rsa.LittleEndian = NO; NSData sigBytes = [rsa SignBytes: inData hashAlg: @"sha256"]; if (rsa.LastMethodSuccess != YES) { NSLog(@"%@",rsa.LastErrorText); return; } // Save the binary signature to a file. success = [fac WriteEntireFile: @"signature.sig" fileData: sigBytes]; if (success != YES) { NSLog(@"%@",fac.LastErrorText); return; } NSLog(@"%@",@"Success."); |
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