椭圆曲线加密的填充类型是什么？ [英] What is the padding type for Elliptic Curve Crypto

问题描述

对于ECC， SecKeyGeneratePair 之后，我尝试通过公钥加密纯文本。 SecKeyEncrypt 返回-4（errSecUnimplemented）。我不知道填充类型是否正确。我尝试了我的xcode中的所有类型，它们不工作。有人可以解释为什么 SecKeyEncrypt 返回-4？

After SecKeyGeneratePair for ECC, I try to encrypt plaintext by the public key. SecKeyEncrypt returns -4(errSecUnimplemented). I am not sure about the padding type is correct. I tried all the types in my xcode, they don't work as well. Can somebody explain why SecKeyEncrypt returns -4?

(NSData *)encrypt:(NSString *)plainTextString key:(SecKeyRef)publicKey {

    NSData *data = [plainTextString dataUsingEncoding:NSUTF8StringEncoding];

    size_t encryptedDataLength = SecKeyGetBlockSize(publicKey);

    NSMutableData *encryptedData = [[NSMutableData alloc]
                                    initWithLength:encryptedDataLength];

    OSStatus err = SecKeyEncrypt(publicKey,
                                 kSecPaddingOAEP,
                                 [data bytes],
                                 [data length],
                                 [encryptedData mutableBytes],
                                 &encryptedDataLength);
    NSLog(@"errEXX:  %ld", err);

    [encryptedData setLength:encryptedDataLength];


    return encryptedData;
}

推荐答案

Apple的实现只支持ECDSA，它可以用于签名而不是加密。有关使用其他方案使用椭圆曲线加密的信息，请参阅是否可以使用椭圆曲线加密来加密数据？

Apple's implementation only supports ECDSA, which can be used for signing but not encryption. For information about encrypting using elliptic curves using other schemes see Is it possible to use elliptic curve cryptography for encrypting data?

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