pod 'ObjectivePGP', :git => 'https://github.com/krzyzanowskim/ObjectivePGP.git', :branch => :master

#include <ObjectivePGP.h>

ObjectivePGP *pgp = [[ObjectivePGP alloc] init];

/* From file */
[pgp importKeysFromFile:@"/path/to/secring.gpg" allowDuplicates:NO];
[pgp importKeysFromFile:@"/path/to/key.asc" allowDuplicates:NO];

/* Load single key from keyring */
[pgp importKey:@"979E4B03DFFE30C6" fromFile:@"/path/to/secring.gpg"];

/* long identifier 979E4B03DFFE30C6 */
PGPKey *key = [pgp getKeyForIdentifier:@"979E4B03DFFE30C6" type:PGPKeyPublic];

/* short identifier 979E4B03 (the same result as previous) */
PGPKey *key = [pgp getKeyForIdentifier:@"979E4B03" type:PGPKeyPublic];

/* first key that match given user */
PGPKey *key = [pgp getKeysForUserID:@"Name <[email protected]>"];

NSError *exportError = nil;

/* export all public keys to file */
BOOL result = [pgp exportKeysOfType:PGPKeyPublic toFile:@"pubring.gpg" error:&exportError];
if (result) {
	NSLog(@"success");
}

PGPKey *myPublicKey = [self.oPGP getKeyForIdentifier:@"979E4B03DFFE30C6" type:PGPKeyPublic];

/* export public key and save as armored (ASCII) file */
NSData *armoredKeyData = [pgp exportKey:myPublicKey armored:YES];
[armoredKeyData writeToFile:@"pubkey.asc" atomically:YES];

NSData *fileContent = [NSData dataWithContentsOfFile:@"/path/file/to/data.txt"];

/* choose key to sign */
PGPKey *keyToSign = [self.oPGP getKeyForIdentifier:@"979E4B03DFFE30C6" type:PGPKeySecret];

/* sign and return signature (detached = YES) */
NSData *signature = [pgp signData:fileContent usingSecretKey:keyToSign passphrase:nil detached:YES];

/* sign and return signed data (detached = NO) */
NSData *signedData = [pgp signData:fileContent usingSecretKey:keyToSign passphrase:nil detached:NO];

/* embedded signature */
NSData *signedContent = [NSData dataWithContentsOfFile:@"/path/file/to/data.signed"];
if ([pgp verifyData:signedContent]) {
	NSLog(@"Verification success");
}

/* detached signature */
NSData *signatureContent = [NSData dataWithContentsOfFile:@"/path/file/to/signature"];
NSData *dataContent = [NSData dataWithContentsOfFile:@"/path/file/to/data.txt"];
if ([pgp verifyData:dataContent withSignature:signatureContent]) {
	NSLog(@"Verification success");
}

NSError *error = nil;

NSData *fileContent = [NSData dataWithContentsOfFile:@"/path/file/to/data.txt"];

/* public key to encrypt data, must be loaded previously */
PGPKey *keyToEncrypt = [self.oPGP getKeyForIdentifier:@"979E4B03DFFE30C6" type:PGPKeyPublic];

/* encrypt data, armor output (ASCII file)  */
NSData *encryptedData = [pgp encryptData:fileContent usingPublicKey:keyToEncrypt armored:YES error:&error];
if (encryptedData && !error) {
	NSLog(@"encryption success");
	[encryptedData writeToFile:@"/path/to/encrypted/file.gpg" atomically:YES]
}

NSData *encryptedFileContent = [NSData dataWithContentsOfFile:@"/path/file/to/data.gpg"];

/* need provide passphrase if required */
NSError *error = nil;
NSData *decryptedData = [pgp decryptData:encryptedFileContent passphrase:nil error:&error];
if (decryptedData && !error) {
	NSLog(@"decryption success");
}

Copyright (C) 2014 Marcin Krzyżanowski
This software is provided 'as-is', without any express or implied warranty. 

In no event will the authors be held liable for any damages arising from the use of this software. 

Permission is granted to anyone to use this software for any purpose,including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions:

- The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation is required.
- Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
- This notice may not be removed or altered from any source or binary distribution.

Usage: opgp [-encrypt] [-key keyfile.asc] [-armor 1] [-msg "message"] ...
Options:
	-decrypt     Decrypt mode (Default)
	-encrypt     Encrypt mode 
	-input       file.txt - path or URL to input file
	-msg         "message" - input text
	-keyid       [28A83333F9C27197|F9C27197] - public or secret key identifier (Optional if "-key" is specified)
	-key         key.asc - public or secret key file
	-output      file.txt.gpg - output path (Optional)
	-pubring     [pubring.gpg|pubring.asc] - keyring with public keys (Optional)
	-secring     [secring.gpg|secring.asc] - keyring with public keys (Optional)
	-passphrase  12345 - secret key password (Optional)
	-armor       [1|0] - output format (Optional)
	-help        Help
	-license     License