IOS oc代码使用openssl 3DES CBC加解密

在iOS中使用OpenSSL进行3DES CBC加解密，你可以使用OpenSSL的C语言接口来实现。以下是一个示例代码，演示了如何在Objective-C中使用OpenSSL进行3DES CBC加解密：

// 导入OpenSSL头文件
#import <openssl/des.h>

// 加密函数
NSString *encrypt3DESCBC(NSString *plainText, NSString *key, NSString *iv) {
    const char *cKey = [key cStringUsingEncoding:NSUTF8StringEncoding];
    const char *cIV = [iv cStringUsingEncoding:NSUTF8StringEncoding];
    const char *cPlainText = [plainText cStringUsingEncoding:NSUTF8StringEncoding];
    int plainTextLength = strlen(cPlainText);
    
    // 初始化3DES上下文
    DES_cblock desKey;
    memset(desKey, 0, sizeof(DES_cblock));
    memcpy(desKey, cKey, 24);
    DES_key_schedule keySchedule;
    DES_set_key_unchecked(&desKey, &keySchedule);
    
    // 加密
    size_t bufferSize = plainTextLength + 8;
    unsigned char *buffer = malloc(bufferSize);
    memset(buffer, 0, bufferSize);
    DES_ncbc_encrypt((unsigned char *)cPlainText, buffer, plainTextLength, &keySchedule, (DES_cblock *)cIV, DES_ENCRYPT);
    
    // 将加密后的数据转换为十六进制字符串
    NSMutableString *encryptedHex = [NSMutableString stringWithCapacity:bufferSize * 2];
    for (int i = 0; i < bufferSize; i++) {
        [encryptedHex appendFormat:@"%02x", buffer[i]];
    }
    
    free(buffer);
    
    return encryptedHex;
}

// 解密函数
NSString *decrypt3DESCBC(NSString *encryptedText, NSString *key, NSString *iv) {
    const char *cKey = [key cStringUsingEncoding:NSUTF8StringEncoding];
    const char *cIV = [iv cStringUsingEncoding:NSUTF8StringEncoding];
    const char *cEncryptedText = [encryptedText cStringUsingEncoding:NSUTF8StringEncoding];    int encryptedTextLength = (int)[encryptedText length] / 2;
    
    // 初始化3DES上下文
    DES_cblock desKey;
    memset(desKey, 0, sizeof(DES_cblock));
    memcpy(desKey, cKey, 24);
    DES_key_schedule keySchedule;
    DES_set_key_unchecked(&desKey, &keySchedule);
    
    // 将十六进制字符串转换为加密后的数据
    unsigned char *buffer = malloc(encryptedTextLength);
    memset(buffer, 0, encryptedTextLength);
    for (int i = 0; i < encryptedTextLength; i++) {
        sscanf(cEncryptedText + i * 2, "%2hhx", &buffer[i]);
    }
    
    // 解密
    size_t bufferSize = encryptedTextLength;
    unsigned char *plainText = malloc(bufferSize);
    memset(plainText, 0, bufferSize);
    DES_ncbc_encrypt(buffer, plainText, bufferSize, &keySchedule, (DES_cblock *)cIV, DES_DECRYPT);
    
    free(buffer);
    
    return [[NSString alloc] initWithBytes:plainText length:bufferSize encoding:NSUTF8StringEncoding];
}

使用示例：

NSString *plainText = @"This is a secret message.";
NSString *key = @"123456781234567812345678";
NSString *iv = @"12345678";

NSString *encryptedText = encrypt3DESCBC(plainText, key, iv);
NSLog(@"Encrypted Text: %@", encryptedText);

NSString *decryptedText = decrypt3DESCBC(encryptedText, key, iv);
NSLog(@"Decrypted Text: %@", decryptedText);

请确保你已经正确导入OpenSSL库，并且在编译设置中设置了正确的头文件搜索路径和链接库。