NAChlorideInit();

NASecureData *secureData = [NASecureData secureReadOnlyDataWithLength:length completion:^(void *bytes, NSUInteger length) {
  // Set the bytes here. After this it will be read-only.
}];

// After the block executes, secureData is read-only. You can set it to no access (or read/write).
// If you set it to no access and secureData.bytes is accessed, it will SIGABRT. For example,
// secureData.protection = NASecureDataProtectionNoAccess;

NSData *data = [NARandom randomData:32]; // 32 bytes of random data
NSData *data = [NARandom randomSecureReadOnlyData:32]; // 32 bytes of random, secure, read-only data

NSData *key = [NARandom randomData:NASecretBoxKeySize];
NSData *nonce = [NARandom randomData:NASecretBoxNonceSize];
NSData *message = [@"This is a secret message" dataUsingEncoding:NSUTF8StringEncoding];

NASecretBox *secretBox = [[NASecretBox alloc] init];
NSError *error = nil;
NSData *encrypted = [secretBox encrypt:message nonce:nonce key:key error:&error];
// If an error occurred encrypted will be nil and error set

NSData *decrypted = [secretBox decrypt:encrypted nonce:nonce key:key error:&error];

NSData *key = [NARandom randomData:NAAuthKeySize];
NSData *message = [@"This is a message" dataUsingEncoding:NSUTF8StringEncoding];

NSError *error = nil;
NAAuth *auth = [[NAAuth alloc] init];
NSData *authData = [auth auth:message key:key &error];
BOOL verified = [auth verify:authData data:message key:key error:&error];

NSData *key = [NARandom randomData:NAAEADKeySize];
NSData *nonce = [NARandom randomData:NAAEADNonceSize];
NSData *message = [@"This is a secret message" dataUsingEncoding:NSUTF8StringEncoding];
NSData *additionalData = [@"Additional data" dataUsingEncoding:NSUTF8StringEncoding];

NAAEAD *AEAD = [[NAAEAD alloc] init];
NSError *error = nil;
NSData *encryptedData = [AEAD encryptChaCha20Poly1305:message nonce:nonce key:key additionalData:additionalData error:&error];
NSData *decryptedData = [AEAD decryptChaCha20Poly1305:encryptedData nonce:nonce key:key additionalData:additionalData error:&error];

NSError *error = nil;
NABoxKeypair *keypair = [NABoxKeypair generate:&error];

NSData *nonce = [NARandom randomData:NABoxNonceSize];
NSData *message = [@"This is a secret message" dataUsingEncoding:NSUTF8StringEncoding];

NABox *box = [[NABox alloc] init];
NSData *encryptedData = [box encrypt:message nonce:nonce keypair:keypair error:&error];
NSData *decryptedData = [box decrypt:encryptedData nonce:nonce keypair:keypair error:&error];

NSData *key = [@"toomanysecrets" dataUsingEncoding:NSUTF8StringEncoding];
NSData *salt = [NARandom randomData:NAScryptSaltSize];
NSError *error = nil;
NSData *data = [NAScrypt scrypt:key salt:salt error:&error];

NSData *key = [NARandom randomData:NAOneTimeAuthKeySize];
NSData *message = [@"This is a message" dataUsingEncoding:NSUTF8StringEncoding];

NSError *error = nil;
NAOneTimeAuth *oneTimeAuth = [[NAOneTimeAuth alloc] init];
NSData *auth = [oneTimeAuth auth:message key:key error:&error];
BOOL verified = [oneTimeAuth verify:auth data:message key:key error:&error];

NSData *key = [NARandom randomData:NAStreamKeySize];
NSData *nonce = [NARandom randomData:NAStreamNonceSize];
NAStream *stream = [[NAStream alloc] init];
NSError *error = nil;
NSData *encrypted = [stream xor:message nonce:nonce key:key error:&error];
NSData *decrypted = [stream xor:encrypted nonce:nonce key:key error:&error];

dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
NADispatch(queue, ^id(NSError **error) {
  return [NAScrypt scrypt:password salt:salt error:error];
}, ^(NSError *error, NSData *data) {
  // This is on the main queue.
  // Error is set if it failed.
});