英文:
create 2 dimension array in C, and every cell with 512 bit size
问题
以下是翻译好的内容：
我想要创建2维数组，维度为2乘以M，数组中的任何单元格都将有512位。我考虑创建类似于以下代码的结构：
#define M 1024
typedef struct {
unsigned char public_key[2][M];
unsigned char private_key[2][M];
} key_pair
void keygen(key *key_pair){
srand(time(NULL))
//
}
但我理解，数组中的每个单元格的大小是256位，因为它是char类型，我希望有512位，我不确定如何解决这个问题的简单方法。
我想在public_key和private_key变量中，每个单元格都有512位的随机值。可能char不是一个好的选择，但我不明白正确的做法是什么，我想我有点困惑。
我在Python中有这段代码，在Python中做这很简单，我也想在C中做到。
def keygen():
SecretKey = np.zeros((2,M), dtype=object)
PublicKey = np.zeros((2,M), dtype=object)
for i in range(0,M):
SecretKey[0][i] = secrets.token_bytes(512/8)
SecretKey[1][i] = secrets.token_bytes(512/8)
PublicKey[0][i] = secrets.token_bytes(512/8)
PublicKey[1][i] = secrets.token_bytes(512/8)
key = [SecretKey, PublicKey]
return key
在Python中，它运行得很好。
英文:
I want to create 2d arrays, with dimension of 2 by M, and any cell in the array will have 512 bit. I was think to create something like this:
#define M 1024
typedef struct {
unsigned char public_key[2][M];
unsigned char private_key[2][M];
} key_pair
void keygen(key *key_pair){
srand(time(NULL))
//
}
But as I can understand, every cell in this array is of size of 256 bit because is type of char, I want 512 bit, I not sure what is the simple idea to solve it.
I want have in public_key and private_key variables, a random value of 512bit in every cell. probably char I not good option, but I not able to understand what is the right way to do it, I think that I'm little a bit confused.
I have the code in Python, in Python its very simple to do it, and i want to do it in C as well.
def keygen():
SecretKey = np.zeros((2,M), dtype=object)
PublicKey = np.zeros((2,M), dtype=object)
for i in range(0,M):
SecretKey[0][i] = secrets.token_bytes(512/8)
SecretKey[1][i] = secrets.token_bytes(512/8)
PublicKey[0][i] = secrets.token_bytes(512/8)
PublicKey[1][i] = secrets.token_bytes(512/8)
key = [SecretKey, PublicKey]
return key
In python its work perfectly
答案1
得分: 1
-
创建一个大小为512位的数据类型（例如一个结构体）。
-
创建一个数组，其单元格是该数据类型。
#include <limits.h>
#define M 1024
#define CELL_LENGTH_IN_BITS 512
struct cell_s {
unsigned char data[(CELL_LENGTH_IN_BITS + CHAR_BITS - 1) / CHAR_BITS];
};
struct cell_s array[2][M];
在这个示例中，如果CHAR_BITS不是8，单元格的大小可能不是512位，但至少是512位。
英文:
- Create a data type (a structure, for example) whose size is 512 bit.
- Create an array whose cell is the data type.
#include <limits.h>
#define M 1024
#define CELL_LENGTH_IN_BITS 512
struct cell_s {
unsigned char data[(CELL_LENGTH_IN_BITS + CHAR_BITS - 1) / CHAR_BITS];
};
struct cell_s array[2][M];
In this example, the size of a cell may not be 512 bit if CHAR_BITS is not 8, but at least 512 bit.
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