SHA (Secure Hash Algorithm)

SHA (Secure Hash Algorithm)

 

SHA is developed in USA, When it's started, there's only SHA-0 exsited.

Now SHA-256, SHA-224 and SHA-1 is added.

SHE-1 is the most famous hash algorithm. 

SHA algorithm is used to check integrity of critical data. 

MD5 is also sort of hash algorithm.

And this hash function can be used for password which shouldn't decrypt.

In openssl, we can see this SHA algorithm, and use like this;

 

 

unsigned char *SHA(const unsigned char *d, size_t n, unsigned char *md);

 

or

 

int SHA_Init(SHA_CTX *c);
int SHA_Update(SHA_CTX *c, const void *data, size_t len);
int SHA_Final(unsigned char *md, SHA_CTX *c);

 

 

 

It is simple password program using hash function (in openssl).

- include sha.h (openssl source file)

- Use libcrypto.so library

- Openssl Version 1.0.0

 

#include <openssl/sha.h> char *passwd, *out; passwd = malloc(128); out = malloc(32); printf("input your PW : "); scanf("%s", passwd); SHA256(passwd, strlen(passwd), out);   > gcc -o test test.c -lcrypto

 

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