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140 lines
3.8 KiB
Markdown
140 lines
3.8 KiB
Markdown
## 介绍
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在数据传输当中有些敏感的数据需要进行加密来保证安全，比如：用户名密码。
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加解密算法一般分为：**对称加密算法** 和 **非对称加密算法**。
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这个模块提供了一些基本的加解密算法：
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- [x] DES 加解密
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- [x] DES3 加解密
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- [ ] AES 加解密
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- [ ] SHA1 加密
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- [ ] MD5 加密
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- [ ] HMAC 计算
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- [ ] blowfish 加解密
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- [ ] RSA 加解密、公钥、签名、转换
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## 接口
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### DES
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```c
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int des_set_key(const uint8_t key[8]);
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int des_crypt_ecb(const uint8_t input[8], uint8_t output[8], uint8_t mode);
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int des_crypt_cbc(const uint8_t *input, uint8_t *output, uint32_t length, uint8_t mode);
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```
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DES算法常见ECB和CBC模式，ECB模式下每一个加密块独立进行运算，而CBC模式是会依赖前一个加密块进行运算。
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在进行加解密之前，需要先设置密钥`des_set_key`，密钥是默认8个字节。
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`des_crypt_ecb`加解密算法都是用这个函数，通过`mode`参数设置为加密还是解密。
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`des_crypt_cbc`与`des_crypt_ecb`不同，`input`和`output`长度需一样而是8的倍数，通过`length`传入。
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例子：
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```c
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void test_des(void)
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{
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uint8_t key[8] = "hello";
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uint8_t data_block[8] = {1, 2, 3, 4, 5, 6, 7, 9};
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uint8_t processed_block[8];
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int i;
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des_set_key(key);
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printf("des ecb encrypt: ");
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des_crypt_ecb(data_block, processed_block, DES_ENCRYPT);
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for (i = 0; i < 8; i++)
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{
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printf("%d ", processed_block[i]);
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}
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printf("\r\n");
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printf("des ecb decrypt: ");
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des_crypt_ecb(processed_block, data_block, DES_DECRYPT);
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for (i = 0; i < 8; i++)
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{
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printf("%d ", data_block[i]);
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}
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printf("\r\n");
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///////////////////////////////////////
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printf("des cbc encrypt: ");
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des_crypt_cbc(data_block, processed_block, 8, DES_ENCRYPT);
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for (i = 0; i < 8; i++)
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{
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printf("%d ", processed_block[i]);
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}
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printf("\r\n");
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printf("des cbc decrypt: ");
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des_crypt_cbc(processed_block, data_block, 8, DES_DECRYPT);
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for (i = 0; i < 8; i++)
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{
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printf("%d ", data_block[i]);
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}
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printf("\r\n");
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}
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```
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结果：
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```
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des ecb encrypt: 156 151 171 0 235 148 83 44
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des ecb decrypt: 1 2 3 4 5 6 7 9
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des cbc encrypt: 156 151 171 0 235 148 83 44
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des cbc decrypt: 1 2 3 4 5 6 7 9
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```
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### DES3
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```c
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int des3_set_key2(const uint8_t key[16]);
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int des3_set_key3(const uint8_t key[24]);
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int des3_crypt_ecb(const uint8_t input[8], uint8_t output[8], uint8_t mode);
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int des3_crypt_cbc(const uint8_t *input, uint8_t *output, uint32_t length, uint8_t mode);
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```
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在用法上`DES3`和`DES`是一致的，是对des三次加密，密钥的长度也相应增长，可以设置为16字节和24字节的密钥。其他`ECB`和`CBC`的加解密模式用法和`DES`是一样的。
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例子：
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```c
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void test_des3(void)
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{
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uint8_t key[24] = "hello world";
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uint8_t data_block[8] = {1, 2, 3, 4, 5, 6, 7, 9};
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uint8_t processed_block[8];
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int i;
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des3_set_key2(key);
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printf("des3 ecb encrypt: ");
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des3_crypt_ecb(data_block, processed_block, DES_ENCRYPT);
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for (i = 0; i < 8; i++)
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{
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printf("%d ", processed_block[i]);
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}
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printf("\r\n");
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printf("des3 ecb decrypt: ");
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des3_crypt_ecb(processed_block, data_block, DES_DECRYPT);
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for (i = 0; i < 8; i++)
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{
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printf("%d ", data_block[i]);
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}
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printf("\r\n");
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///////////////////////////////////////
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printf("des3 cbc encrypt: ");
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des3_crypt_cbc(data_block, processed_block, 8, DES_ENCRYPT);
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for (i = 0; i < 8; i++)
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{
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printf("%d ", processed_block[i]);
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}
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printf("\r\n");
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printf("des3 cbc decrypt: ");
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des3_crypt_cbc(processed_block, data_block, 8, DES_DECRYPT);
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for (i = 0; i < 8; i++)
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{
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printf("%d ", data_block[i]);
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}
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printf("\r\n");
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}
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```
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结果：
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```
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des3 ecb encrypt: 48 251 201 178 251 3 6 54
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des3 ecb decrypt: 1 2 3 4 5 6 7 9
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des3 cbc encrypt: 48 251 201 178 251 3 6 54
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des3 cbc decrypt: 1 2 3 4 5 6 7 9
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``` |