c# - IOS公钥加密和C#解密
<p><p>我试图在 IOS 中加密一个字符串，然后在 C# 中解密它。</p>
<p>我已经能够仅使用 C# 加密和解密字符串，但 IOS 端似乎不正确。</p>
<p>在 C# 中，我使用它来解密字符串:</p>
<pre><code>private static RSACryptoServiceProvider _rsa;
private const int PROVIDER_RSA_FULL = 1;
private const string CONTAINER_NAME = "KeyContainer";
private const string PROVIDER_NAME = "Microsoft Strong Cryptographic Provider";
private static void _AssignParameter()
{
CspParameters cspParams;
cspParams = new CspParameters(PROVIDER_RSA_FULL, PROVIDER_NAME, CONTAINER_NAME);
cspParams.Flags = CspProviderFlags.UseMachineKeyStore;
CryptoKeyAccessRule rule = new CryptoKeyAccessRule("everyone", CryptoKeyRights.FullControl, AccessControlType.Allow);
cspParams.CryptoKeySecurity = new CryptoKeySecurity();
cspParams.CryptoKeySecurity.SetAccessRule(rule);
_rsa = new RSACryptoServiceProvider(cspParams);
_rsa.PersistKeyInCsp = false;
}
private static void decrypt(byte[] data, byte[] PrivateKey)
{
_AssignParameter();
_rsa.ImportCspBlob(PrivateKey);
_rsa.Decrypt(data, false);
}
</code></pre>
<p>上面的 C# 代码只是一个片段，并不是完整的代码。</p>
<p>看起来很简单，这是我用于IOS的，</p>
<pre><code> //get nsdata from mod and exp
NSString *mod = publicKeyObjects;
NSData *pubKeyModData= ; //172 bytes
NSString *exp = publicKeyObjects;
NSData *pubKeyExpData= ;
//create nsdata key with mod and exp
NSMutableArray *publicKeyArray = [ init];
;
;
NSData *publicKeyData = ;
//add the key to the keychain and create a ref
NSData* peerTag = [@"KeyContainer" dataUsingEncoding:NSUTF8StringEncoding];
NSMutableDictionary *publicKey = [ init];
;
;
;
SecItemDelete((__bridge CFDictionaryRef)publicKey);
CFTypeRef persistKey = nil;
// Add persistent version of the key to system keychain
;
;
forKey:(__bridge id)kSecReturnPersistentRef];
OSStatus secStatus = SecItemAdd((__bridge CFDictionaryRef)publicKey, &persistKey);
if (persistKey != nil)
CFRelease(persistKey);
// Now fetch the SecKeyRef version of the key
SecKeyRef keyRef = nil;
;
;
forKey:(__bridge id)kSecReturnRef];
;
secStatus = SecItemCopyMatching((__bridge CFDictionaryRef)publicKey,(CFTypeRef *)&keyRef);
NSData* stringData = [@"string to encrypt" dataUsingEncoding:NSUTF8StringEncoding];
NSData* encryptedString = ;
-(NSData *)encrypt:(NSData *)Bytes usingKey:(SecKeyRef)key
{
size_t cipherBufferSize = SecKeyGetBlockSize(key); //returns 172
uint8_t *cipherBuffer = NULL;
cipherBuffer = malloc(cipherBufferSize * sizeof(uint8_t));
memset((void *)cipherBuffer, 0x0, cipherBufferSize);
OSStatus status = SecKeyEncrypt(key, kSecPaddingNone,
(const uint8_t *),
, cipherBuffer,
&cipherBufferSize);
if (status == noErr)
{
NSData *encryptedBytes = [
initWithBytes:(const void *)cipherBuffer
length:cipherBufferSize];
if (cipherBuffer)
{
free(cipherBuffer);
}
NSLog(@"Encrypted text (%d bytes): %@", , );
return encryptedBytes;
}
else
{
NSLog(@"encrypt:usingKey: Error: %d", (int)status);
return nil;
}
}
</code></pre>
<p>所以一旦我尝试解密我得到的 C# 代码中的数据:</p>
<p><code>要解密的数据超过了这个模数的最大值 128 字节。</code></p>
<p>我用谷歌搜索了这个错误，发现它与 keysize 有关系，但是我用 IOS 导入模数后的 keysize 是 172 字节。</p>
<p>但我只是用 <code>_rsa.ToXmlString(false);</code></p> 导出公钥
<p><em><strong>编辑</strong></em></p>
<p>我想我修正了自己的错误，</p>
<pre><code> //get nsdata from mod and exp
NSString *mod = publicKeyObjects;
NSData *pubKeyModData= ;
NSString *exp = publicKeyObjects;
NSData *pubKeyExpData= ;
</code></pre>
<p>这是直接用 utf8 转换 base64 字符串，它应该使用:</p>
<pre><code>NSData *pubKeyModData = [ initWithBase64EncodedString:mod options:0];
NSData *pubKeyExpData = [ initWithBase64EncodedString:exp options:0];
</code></pre>
<p>现在我收到另一个错误<code>Bad Data</code></p>
<p>有人可以在这里指出我正确的方向吗？我也为所有代码道歉。我只是不知道问题出在哪里。</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>回答了我自己的问题，</p>
<pre><code>//get nsdata from mod and exp
NSString *mod = publicKeyObjects;
NSData *pubKeyModData= ;
NSString *exp = publicKeyObjects;
NSData *pubKeyExpData= ;
</code></pre>
<p>变成了这样:</p>
<pre><code>//get nsdata from mod and exp
NSString *mod = publicKeyObjects;
NSData *pubKeyModData = [ initWithBase64EncodedString:mod options:0];
NSString *exp = publicKeyObjects;
NSData *pubKeyExpData = [ initWithBase64EncodedString:exp options:0];
</code></pre>
<p>那么这个</p>
<pre><code>OSStatus status = SecKeyEncrypt(key, kSecPaddingNone,
(const uint8_t *),
, cipherBuffer,
&cipherBufferSize);
</code></pre>
<p>成为:</p>
<pre><code>OSStatus status = SecKeyEncrypt(key, kSecPaddingPKCS1,
(const uint8_t *),
, cipherBuffer,
&cipherBufferSize);
</code></pre>
<p>简单的配置修复。</p></p>
<p style="font-size: 20px;">关于c# - IOS公钥加密和C#解密，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/22450098/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/22450098/
</a>
</p>
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