Question

我目前陷入了一个涉及iOS加密的问题。

我的客户给了我公钥，

"-----BEGIN PUBLIC KEY-----
xxxx
-----END PUBLIC KEY-----"

需要使用的填充策略是RSA / ECB / PKCS1Padding。有了android，它似乎很直接

cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
encryptedBytes = cipher.doFinal(plain.getBytes());

return encryptedBytes;

我在iOS中没有看到任何直接的方法。像Commoncrypto一样使用的任何常见pod都不允许我强制PKCS1填充方案。作为一个非常缺乏RSA和加密经验的人，如果你能帮助我理解如何处理这个问题并引导我完成这个工作，我将非常感激。

Answer 1

使用标准安全框架 - SecKeyEncrypt kSecPaddingPKCS1参数

Answer 2

我的问题是使用非填充解决的：

kSecPaddingNone

Answer 3

-(SecKeyRef)getPublicKeyForEncryption
{
    NSString *thePath = [MAuthBundle pathForResource:@"certificate" ofType:@"der"];

    //2. Get the contents of the certificate and load to NSData
    NSData *certData = [[NSData alloc]
                        initWithContentsOfFile:thePath];

    //3. Get CFDataRef of the certificate data
    CFDataRef myCertData = (__bridge CFDataRef)certData;

    SecCertificateRef myCert;
    SecKeyRef aPublicKeyRef = NULL;
    SecTrustRef aTrustRef = NULL;

    //4. Create certificate with the data
    myCert = SecCertificateCreateWithData(NULL, myCertData);

    //5. Returns a policy object for the default X.509 policy
    SecPolicyRef aPolicyRef = SecPolicyCreateBasicX509();

    if (aPolicyRef) {
        if (SecTrustCreateWithCertificates((CFTypeRef)myCert, aPolicyRef, &aTrustRef) == noErr) {
            SecTrustResultType result;
            if (SecTrustEvaluate(aTrustRef, &result) == noErr) {
                //6. Returns the public key for a leaf certificate after it has been evaluated.
                aPublicKeyRef = SecTrustCopyPublicKey(aTrustRef);
            }
        }
    }

    return aPublicKeyRef;


}

-(NSString*) rsaEncryptString:(NSString*) string
{
        SecKeyRef publicKey = [self getPublicKeyForEncryption];

        NSData* strData = [string dataUsingEncoding:NSUTF8StringEncoding];

         CFErrorRef err ;

         NSData * data = CFBridgingRelease(SecKeyCreateEncryptedData(publicKey, kSecKeyAlgorithmRSAEncryptionPKCS1, ( __bridge CFDataRef)strData, &err));
         NSString *base64EncodedString = [data base64EncodedStringWithOptions:0];
         return base64EncodedString;
}

RSA / ECB / PKCS1Padding iOS加密

3 个答案: