This is a simple implementation of the SHA-1 hashing algorithm in pure C language.
The Secure Hash Algorithm 1 (SHA-1) is a cryptographic hash function that produces a 160-bit (20-byte) hash value known as a message digest, typically rendered as a hexadecimal number, 40 digits long. It was designed by the National Security Agency (NSA) and published by the National Institute of Standards and Technology (NIST) as a U.S. Federal Information Processing Standard.
- Implemented in pure C language.
- Supports hashing of data from memory buffers.
- Follows the SHA-1 specification as outlined in FIPS PUB 180-1.
- Provides both a simple function interface (
SHA1()) and aSHA1_CTXstructure for processing multiple chunks of data.
#include "sha1.h"
int main() {
unsigned char data[] = "Hello, World!";
unsigned char hash[SHA1_BLOCK_SIZE];
SHA1(data, sizeof(data) - 1, hash);
// Print or use the hash as needed
return 0;
}#include "sha1.h"
int main() {
unsigned char data1[] = "Hello, ";
unsigned char data2[] = "World!";
unsigned char hash[SHA1_BLOCK_SIZE];
SHA1_CTX ctx;
SHA1_Init(&ctx);
SHA1_Update(&ctx, data1, sizeof(data1) - 1);
SHA1_Update(&ctx, data2, sizeof(data2) - 1);
SHA1_Final(&ctx, hash);
// Print or use the hash as needed
return 0;
}This project is licensed under the MIT License - see the LICENSE file for details.