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CKEd25519.m
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CKEd25519.m
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//
// CryptoKit
// CKEd25519.m
//
// Copyright (c) 2014 Mehrdad Afshari
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
#import "CKEd25519.h"
#import "ed25519/ed25519.h"
#import <Security/SecRandom.h>
#define ED25519_PRIVATE_KEY_LEN 64
#define ED25519_PUBLIC_KEY_LEN 32
#define ED25519_SIGNATURE_LEN 64
#define ED25519_SHARED_SECRET_LEN 32
@implementation CKEd25519
+ (NSUInteger)privateKeyLength
{
return ED25519_PRIVATE_KEY_LEN;
}
+ (NSUInteger)publicKeyLength
{
return ED25519_PUBLIC_KEY_LEN;
}
+ (NSUInteger)signatureLength
{
return ED25519_SIGNATURE_LEN;
}
+ (NSUInteger)sharedSecretLength
{
return ED25519_SHARED_SECRET_LEN;
}
+ (CKSensitiveBuffer *)randomPrivateKey
{
uint8_t seed[64];
SecRandomCopyBytes(kSecRandomDefault, sizeof(seed), seed);
uint8_t *privateKey = malloc(ED25519_PRIVATE_KEY_LEN);
ed25519_create_privatekey(privateKey, seed);
memset_s(seed, sizeof(seed), 64, sizeof(seed));
return [CKSensitiveBuffer bufferWithBytes:privateKey length:ED25519_PRIVATE_KEY_LEN];
}
+ (NSData *)publicKeyForPrivateKey:(id<CKData>)privateKey
{
uint8_t *publicKey = malloc(ED25519_PUBLIC_KEY_LEN);
ed25519_derive_publickey(publicKey, privateKey.bytes);
return [NSData dataWithBytesNoCopy:publicKey length:ED25519_PUBLIC_KEY_LEN];
}
+ (NSData *)sign:(id<CKData>)message withPrivateKey:(id<CKData>)privateKey
{
return [self sign:message withPrivateKey:privateKey andPublicKey:[self publicKeyForPrivateKey:privateKey]];
}
+ (NSData *)sign:(id<CKData>)message withPrivateKey:(id<CKData>)privateKey andPublicKey:(id<CKData>)publicKey
{
uint8_t *signature = malloc(ED25519_SIGNATURE_LEN);
ed25519_sign(signature, message.bytes, message.length, publicKey.bytes, privateKey.bytes);
return [NSData dataWithBytesNoCopy:signature length:ED25519_SIGNATURE_LEN];
}
+ (BOOL)verifySignature:(id<CKData>)signature ofMessage:(id<CKData>)message byPublicKey:(id<CKData>)publicKey
{
return ed25519_verify(signature.bytes, message.bytes, message.length, publicKey.bytes);
}
+ (CKSensitiveBuffer *)sharedSecretWithPrivateKey:(id<CKData>)privateKey andPublicKey:(id<CKData>)publicKey
{
uint8_t *sharedSecret = malloc(ED25519_SHARED_SECRET_LEN);
ed25519_key_exchange(sharedSecret, publicKey.bytes, privateKey.bytes);
return [CKSensitiveBuffer bufferWithBytes:sharedSecret length:ED25519_SHARED_SECRET_LEN];
}
@end