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带模数和指数的 iPhone RSA 算法

发布于 2024-11-19 10:08:50 字数 67 浏览 3 评论 0原文

我有模数和指数。如何在 iPhone 上使用 RSA 算法对数据进行编码/解码？或者如何从模数和指数生成 DER 格式？

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夜未央樱花落 2024-11-26 10:08:50

如果您想在 iPhone 上生成 DER 数据，我在 GitHub 上有代码可以让您执行此操作：

https://github.com/StCredZero/SCZ-BasicEncodingRules-iOS

SCZ-BasicEncodingRules-iOS

实现基本编码规则以支持将 RSA 密钥导入到 iOS
使用指数的钥匙串。代码针对带有 ARC 的 iOS 5。

假设您已经有一个模数和指数
RSA 公钥作为名为 pubKeyModData 的变量中的 NSData 和
pubKeyModData。然后以下代码将创建一个包含该 RSA 的 NSData
公钥，然后您可以将其插入 iOS 或 OS X 钥匙串中。

NSMutableArray *testArray = [[NSMutableArray alloc] init];
[testArray addObject:pubKeyModData];
[testArray addObject:pubKeyExpData];
NSData *testPubKey = [testArray berData];

这将允许您使用 Apple CryptoExercise 示例中 SecKeyWrapper 的 addPeerPublicKey:keyBits: 方法来存储密钥。或者，从底层API的角度来看，您可以使用SecItemAdd()。

NSString * peerName = @"Test Public Key";

NSData * peerTag = 
   [[NSData alloc] 
       initWithBytes:(const void *)[peerName UTF8String] 
       length:[peerName length]];

NSMutableDictionary * peerPublicKeyAttr = [[NSMutableDictionary alloc] init];

[peerPublicKeyAttr 
   setObject:(__bridge id)kSecClassKey 
   forKey:(__bridge id)kSecClass];
[peerPublicKeyAttr 
   setObject:(__bridge id)kSecAttrKeyTypeRSA 
   forKey:(__bridge id)kSecAttrKeyType];
[peerPublicKeyAttr 
   setObject:peerTag 
   forKey:(__bridge id)kSecAttrApplicationTag];
[peerPublicKeyAttr 
   setObject:testPubKey 
   forKey:(__bridge id)kSecValueData];
[peerPublicKeyAttr 
   setObject:[NSNumber numberWithBool:YES] 
   forKey:(__bridge id)kSecReturnPersistentRef];

sanityCheck = SecItemAdd((__bridge CFDictionaryRef) peerPublicKeyAttr, (CFTypeRef *)&persistPeer);

If you want to generate DER data on the iPhone, I have code on GitHub that will let you do this:

https://github.com/StCredZero/SCZ-BasicEncodingRules-iOS

SCZ-BasicEncodingRules-iOS

Implementation of Basic Encoding Rules to enable import of RSA keys to iOS
KeyChain using exponent. Code targets iOS 5 with ARC.

Let's say you already have a modulus and exponent from
an RSA public key as an NSData in variables named pubKeyModData and
pubKeyModData. Then the following code will create an NSData containing that RSA
public key, which you can then insert into the iOS or OS X Keychain.

NSMutableArray *testArray = [[NSMutableArray alloc] init];
[testArray addObject:pubKeyModData];
[testArray addObject:pubKeyExpData];
NSData *testPubKey = [testArray berData];

This would allow you to store the key using the addPeerPublicKey:keyBits: method from SecKeyWrapper in the Apple CryptoExercise example. Or, from the perspective of the low-level API, you can use SecItemAdd().

NSString * peerName = @"Test Public Key";

NSData * peerTag = 
   [[NSData alloc] 
       initWithBytes:(const void *)[peerName UTF8String] 
       length:[peerName length]];

NSMutableDictionary * peerPublicKeyAttr = [[NSMutableDictionary alloc] init];

[peerPublicKeyAttr 
   setObject:(__bridge id)kSecClassKey 
   forKey:(__bridge id)kSecClass];
[peerPublicKeyAttr 
   setObject:(__bridge id)kSecAttrKeyTypeRSA 
   forKey:(__bridge id)kSecAttrKeyType];
[peerPublicKeyAttr 
   setObject:peerTag 
   forKey:(__bridge id)kSecAttrApplicationTag];
[peerPublicKeyAttr 
   setObject:testPubKey 
   forKey:(__bridge id)kSecValueData];
[peerPublicKeyAttr 
   setObject:[NSNumber numberWithBool:YES] 
   forKey:(__bridge id)kSecReturnPersistentRef];

sanityCheck = SecItemAdd((__bridge CFDictionaryRef) peerPublicKeyAttr, (CFTypeRef *)&persistPeer);

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