(Objective-C) RSA Decrypt using PEM

This example demonstrates decryping RSA encrypted data that is base64 encoded. It uses a private key loaded from a PEM file.

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#import <CkoRsa.h>
#import <CkoPrivateKey.h>
#import <NSString.h>

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

CkoRsa *rsa = [[CkoRsa alloc] init];

CkoPrivateKey *key = [[CkoPrivateKey alloc] init];

// Load an RSA private key from an unencrypted PEM file:
// (To load from an encrypted PEM file, call LoadEncryptedPemFile instead.)

BOOL success = [key LoadPemFile: @"qa_data/rsa/decryptTest/priv.pem"];
if (success != YES) {
    NSLog(@"%@",key.LastErrorText);
    return;
}

// Make the key available to the RSA object
success = [rsa ImportPrivateKeyObj: key];
if (success != YES) {
    NSLog(@"%@",rsa.LastErrorText);
    return;
}

NSString *encryptedStr = @"pP9XFJEsGgxPNHEgNiLB5H5ksCOXDk/G49BPTog1jKLAhYofV4UTH5k2TOYiqRnDnKs8+8uPoN/IxdiGXvuYG8HRzN0HtkhoZO/AxeyaB9S7eddCUlT0Pl2PEB2yQ9HG5rM7jqYOD6MAM4cuX7hqT8fa8tbzJzmBwdfFDBz94bwQjULHiO+gklIBC4vhkXT4yjuvEjxTAKU6tJeZYkBooJNdS/vE5RZRpuF6bGZU41Qc17qFR+iReBq+9f8IMmw8WR8fMbOCaygOfFS1nw7JVsIMGsAIXS8rUaJ/2DfGPfQx5HCiVtTOreGYRUI3esAQjnvUCnavZyQgs53nl7e2aA==";

rsa.EncodingMode = @"base64";

BOOL usePrivateKey = YES;
NSString *decryptedStr = [rsa DecryptStringENC: encryptedStr bUsePrivateKey: usePrivateKey];

NSLog(@"%@",@"Decrypted:");
NSLog(@"%@",decryptedStr);