ovo/docs/ovo_math

Class ovo::math

math.rand(int a, int b)

Generate a rand number between a(include) and b(include).

math.randStr(unsigned int length = 0)

Gnerate a rand string.

math.md5()

This function can generate a Hash md5 value from a string.

Params:

• string value The content need to encode.

Return:

• string Hex md5 code The generated Hex md5 code.

Example

#include <iostream>
#include <string>
#include "ovo.h"
  
int main()
{
    std::string s = "a";
    ovo::math m;

    std::cout << m.md5(s) << std::endl;
    return 0;
}

This will get the following result.

0cc175b9c0f1b6a831c399e269772661

Advanced

• math.toStr(int length) You can use this to define the length of the generated code.
• math.getDigest() Use this generate a binary md5 code.

Advanced Example

#include <iostream>
#include <string>
#include "ovo.h"
  
int main()
{
    std::string s = "a";
    ovo::math::MD5 m(s);

    std::cout << m.toStr() << std::endl;
    std::cout << m.getDigest() << std::endl;
    return 0;
}

This will get the following result.

0cc175b9c0f1b6a8
♀羥估穸?脵鈏w&a

---

math.sha256()

This function can generate a Hash sha256 value from a string.

Params:

• string value The content need to encode.

Return:

• string Hex md5 code The generated sha256 code.

Example

#include <iostream>
#include <string>
#include "ovo.h"
  
int main()
{
    std::string s = "a";
    ovo::math m;

    std::cout << m.sha256(s) << std::endl;
    return 0;
}

This will get the following result.

ed968e840d10d2d313a870bc131a4e2c311d7ad09bdf32b3418147221f51a6e2

---

math.base64_encode()

This function can encode a string to base64 format.

Params:

• string value The content need to encode.

Return:

• string base64Code The generated base64 code.

Example

#include <iostream>
#include <string>
#include "ovo.h"
  
int main()
{
    std::string s = "aaaaa";

    ovo::math m;

    std::cout << m.base64_encode(s) << std::endl;
    return 0;
}

This will get the following result.

YWFhYWE=

---

math.base64_decode()

This function can decode a string from base64 format.

Params:

• string base64Code The base64 content need to decode.

Return:

• string value The original string.

Example

#include <iostream>
#include <string>
#include "ovo.h"
  
int main()
{
    std::string s = "YWFhYWE=";

    ovo::math m;

    std::cout << m.base64_decode(s) << std::endl;
    return 0;
}

This will get the following result.

aaaaa

---

math.aes_ini()

在AES加密前使用本函数来设置密钥。

Params:

• string key 加密解密密钥
• string iv chain参数，可以留空

---

math.aes_encode()

AES加密，使用前请先调用math.aes_ini()设置密钥

Params:

• string strSrc 待加密字符串

Return:

• string str 加密后的字符串

---

math.aes_decode()

AES解密，使用前请先调用math.aes_ini()设置密钥

Params:

• string strSrc 待解密字符串

Return:

• string str 解密后的字符串

Example

#include <iostream>
#include <string>
#include "ovo.h"
  
int main()
{
    ovo::math m;
    
    //初始化aes模块
    m.aes_ini("dq3tea09fyd98hds"); //这里填入的是密钥，可以是任意长度
    
    string str1 = "Such a cute world~";
    cout << "before: " << str1 << endl;
    //加密
    string str2 = m.aes_encode(str1);
    cout << "Encode: " << str2 << endl;
    //解密
    string str3 = m.aes_decode(str2);
    cout << "Decode: " << str3 << endl;
    
    return 0;
}

This will get the following result.

before: Such a cute world~
Encode: nyAu2sPOR91zny+2w4brwivyHYzDIJV0MDLxonSuztE=
Decode: Such a cute world~