rhash_md5.c

This is an MD5 implementation from Aleksey Kravchenko's RHash utility, extracted for use with the clib package manager.

Installation

Install with clib:

$ clib install pepaslabs/rhash_md5.c

API

void rhash_md5_init(md5_ctx *ctx);
void rhash_md5_update(md5_ctx *ctx, const unsigned char* msg, size_t size);
void rhash_md5_final(md5_ctx *ctx, unsigned char result[16]);

Usage

Dump this into a console to build a test program:

cd /tmp
cat > main.c << 'EOF'
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>

#include "rhash_md5/md5.h"

int main(int argc, char **argv) {
    // compute the MD5 sum of the string "Hello, World!"
    md5_ctx ctx;
    unsigned char hash[16];
    rhash_md5_init(&ctx);
    rhash_md5_update(&ctx, (const unsigned char *)"Hello, World!", 13);
    rhash_md5_final(&ctx, hash);

    // print the (binary) MD5 sum to stdout
    write(fileno(stdout), hash, 16);

    return EXIT_SUCCESS;
}
EOF
clib install pepaslabs/rhash_md5.c
gcc -Wall -Werror -c deps/rhash_md5/*.c
gcc -Wall -Werror -Ideps *.o main.c

Try it out!

$ ./a.out | hexdump
0000000 65 a8 e2 7d 88 79 28 38 31 b6 64 bd 8b 7f 0a d4
0000010

Verify the output against your system's md5 utility.

On a mac:

$ echo -n 'Hello, World!' | md5
65a8e27d8879283831b664bd8b7f0ad4

On linux:

$ echo -n 'Hello, World!' | md5sum
65a8e27d8879283831b664bd8b7f0ad4  -

License

Quoting from http://rhash.anz.ru/license.php (as of 2016/11/1):

License

The RHash program and LibRHash library are distributed under RHash License, (see below). Basically, the program, library and source code can be used free of charge in Open Source, Commercial and other projects. In the case an OSI- approved license is required the MIT license should be used.

In accordance with the above, I am redistributing this code under the terms of the MIT license.