Objective C 中的 RSA 实现

RSA加密算法是一种非对称加密算法，它能够确保数据在传输过程中的安全性。Objective C作为一种流行的编程语言，也提供了RSA的实现方法。下面我们将介绍Objective C中的RSA加密算法，并给出一个简单的案例代码。

objective-c
- (void)generateRSAKeyPair {
    NSDictionary *attributes = @{(id)kSecAttrKeyType: (id)kSecAttrKeyTypeRSA,
                                 (id)kSecAttrKeySizeInBits: @2048};
    
    SecKeyRef publicKeyRef = NULL;
    SecKeyRef privateKeyRef = NULL;
    
    OSStatus status = SecKeyGeneratePair((CFDictionaryRef)attributes, &publicKeyRef, &privateKeyRef);
    
    if (status == errSecSuccess) {
        NSLog(@"RSA key pair generated successfully.");
        
        // 在这里可以保存公私钥或者进行其他操作
    } else {
        NSLog(@"Failed to generate RSA key pair with status: %d", status);
    }
}

objective-c
- (NSData *)encryptData:(NSData *)data withPublicKey:(SecKeyRef)publicKey {
    size_t blockSize = SecKeyGetBlockSize(publicKey);
    size_t encryptedDataSize = blockSize;
    uint8_t *encryptedData = malloc(encryptedDataSize);
    
    OSStatus status = SecKeyEncrypt(publicKey, kSecPaddingPKCS1, data.bytes, data.length, encryptedData, &encryptedDataSize);
    
    if (status == errSecSuccess) {
        NSLog(@"Data encrypted successfully.");
        return [NSData dataWithBytesNoCopy:encryptedData length:encryptedDataSize freeWhenDone:YES];
    } else {
        NSLog(@"Failed to encrypt data with status: %d", status);
        free(encryptedData);
        return nil;
    }
}
- (NSData *)decryptData:(NSData *)data withPrivateKey:(SecKeyRef)privateKey {
    size_t blockSize = SecKeyGetBlockSize(privateKey);
    size_t decryptedDataSize = blockSize;
    uint8_t *decryptedData = malloc(decryptedDataSize);
    
    OSStatus status = SecKeyDecrypt(privateKey, kSecPaddingPKCS1, data.bytes, data.length, decryptedData, &decryptedDataSize);
    
    if (status == errSecSuccess) {
        NSLog(@"Data decrypted successfully.");
        return [NSData dataWithBytesNoCopy:decryptedData length:decryptedDataSize freeWhenDone:YES];
    } else {
        NSLog(@"Failed to decrypt data with status: %d", status);
        free(decryptedData);
        return nil;
    }
}