Question

我使用SecKeyGeneratePair生成了私钥和公钥我已将SecKeyRef转换为NSData

size_t keySize = SecKeyGetBlockSize（publicKey）;

NSData * keyData = [NSData dataWithBytes：publicKey length：keySize];

但不幸的是，我无法在keyData类型中重新转换SecKeyRef。

以下是问题：如何在SecKeyRef类型中重新转换NSData？

这是代码！

    //
    //  RSA.m
    //  example
    //
    //  Created by Ferdinando Picone on 07/11/13.
    //  Copyright (c) 2013 Ferdinando Picone. All rights reserved.
    //

    #import "RSA.h"
    #import <Security/Security.h>
    #import "NSData+Base64.h"

    static const UInt8 publicKeyIdentifier[] = "com.apple.sample.publickey\0";
    static const UInt8 privateKeyIdentifier[] = "com.apple.sample.privatekey\0";

    SecKeyRef publicKey = NULL;
    SecKeyRef privateKey = NULL;

    @implementation RSA

    -(void)start{
RSA *one = [[RSA alloc]init];


// Generate public and private key
[one generateKeyPairPlease];
NSLog(@" %@", publicKey);
NSLog(@" %@", privateKey);

//Convert public key in NSData Type
size_t  keySize = SecKeyGetBlockSize(publicKey);
NSData  *keyData = [NSData dataWithBytes:publicKey length:keySize];
NSLog (@" %@", keyData);

//Convert public key in NSString Type
NSString *keyStringB64 =[keyData base64EncodedString];


//Reconvert NSString in a NSData Type (newKeyData)
NSData *newKeyData = [NSData dataFromBase64String:keyStringB64];

NSLog(@" %@", newKeyData);

// In the debug you can see that keyData==newKeyData

// NOW I NEED TO RECONVERT newKeyData in a SecKeyRef newPublicKey
SecKeyRef newPublicKey=NULL;

    }

    -(void) generateKeyPairPlease{

OSStatus status = noErr;
NSMutableDictionary *privateKeyAttr = [[NSMutableDictionary alloc] init];
NSMutableDictionary *publicKeyAttr = [[NSMutableDictionary alloc] init];
NSMutableDictionary *keyPairAttr = [[NSMutableDictionary alloc] init];

NSData * publicTag = [NSData dataWithBytes:publicKeyIdentifier
                                    length:strlen((const char *)publicKeyIdentifier)];
NSData * privateTag = [NSData dataWithBytes:privateKeyIdentifier
                                     length:strlen((const char *)privateKeyIdentifier)];


[keyPairAttr setObject:(__bridge id)kSecAttrKeyTypeRSA
                forKey:(__bridge id)kSecAttrKeyType];
[keyPairAttr setObject:[NSNumber numberWithInt:1024]
                forKey:(__bridge id)kSecAttrKeySizeInBits];

[privateKeyAttr setObject:[NSNumber numberWithBool:YES]
                   forKey:(__bridge id)kSecAttrIsPermanent];
[privateKeyAttr setObject:privateTag
                   forKey:(__bridge id)kSecAttrApplicationTag];

[publicKeyAttr setObject:[NSNumber numberWithBool:YES]
                  forKey:(__bridge id)kSecAttrIsPermanent];
[publicKeyAttr setObject:publicTag
                  forKey:(__bridge id)kSecAttrApplicationTag];

[keyPairAttr setObject:privateKeyAttr
                forKey:(__bridge id)kSecPrivateKeyAttrs];
[keyPairAttr setObject:publicKeyAttr
                forKey:(__bridge id)kSecPublicKeyAttrs];

status = SecKeyGeneratePair((__bridge CFDictionaryRef)keyPairAttr,
                            &publicKey, &privateKey);


    }


    @end

Answer 1

您可以使用iOS 10.10中提供的API从NSData创建SecKeyRef

  <table class="container">
    <tr class='A'>
      <td><a href="first_a_example.com">Hello</a></td>
      <td> ... </td>
      <td><a href="example.com">Dummy link a</a></td>
      <td> ... </td>
      <td> ... </td>
    </tr>
    <tr class='B'>
      <td><a href="example.com">Dummy link b</a></td>
      <td> ... </td>
      <td><a href="example.com">Dummy link b</a></td>
      <td> ... </td>
      <td> ... </td>
    </tr>
    <tr class='A'>
      <td><a href="second_example.com">Dummy link a</a></td>
      <td> ... </td>
      <td><a href="example.com">Dummy link a</a>
      </td>
      <td> ... </td>
      <td> ... </td>
    </tr>
    ...
  </table>

将NSData转换为SecKeyRef

1 个答案: