text: /*
   * This is an OpenSSL-compatible implementation of the RSA Data Security, Inc.
   * MD5 Message-Digest Algorithm (RFC 1321).
   *
   * Homepage:
   * http://openwall.info/wiki/people/solar/software/public-domain-source-code/md5
   *
   * Author:
   * Alexander Peslyak, better known as Solar Designer <solar at openwall.com>
   *
   * This software was written by Alexander Peslyak in 2001.  No copyright is
   * claimed, and the software is hereby placed in the public domain.
   * In case this attempt to disclaim copyright and place the software in the
   * public domain is deemed null and void, then the software is
   * Copyright (c) 2001 Alexander Peslyak and it is hereby released to the
   * general public under the following terms:
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted.
   *
   * There's ABSOLUTELY NO WARRANTY, express or implied.
   *
   * (This is a heavily cut-down "BSD license".)
   *
   * This differs from Colin Plumb's older public domain implementation in that
   * no exactly 32-bit integer data type is required (any 32-bit or wider
   * unsigned integer data type will do), there's no compile-time endianness
   * configuration, and the function prototypes match OpenSSL's.  No code from
   * Colin Plumb's implementation has been reused; this comment merely compares
   * the properties of the two independent implementations.
   *
   * The primary goals of this implementation are portability and ease of use.
   * It is meant to be fast, but not as fast as possible.  Some known
   * optimizations are not included to reduce source code size and avoid
   * compile-time configuration.
   */
  
  #include <string.h>
  #include <stdio.h>
  #include "md5.h"
  
  /*
   * The basic MD5 functions.
   *
   * F and G are optimized compared to their RFC 1321 definitions for
   * architectures that lack an AND-NOT instruction, just like in Colin Plumb's
   * implementation.
   */
  #define F(x, y, z)			((z) ^ ((x) & ((y) ^ (z))))
  #define G(x, y, z)			((y) ^ ((z) & ((x) ^ (y))))
  #define H(x, y, z)			((x) ^ (y) ^ (z))
  #define I(x, y, z)			((y) ^ ((x) | ~(z)))
  
  /*
   * The MD5 transformation for all four rounds.
   */
  #define STEP(f, a, b, c, d, x, t, s) \
  	(a) += f((b), (c), (d)) + (x) + (t); \
  	(a) = (((a) << (s)) | (((a) & 0xffffffff) >> (32 - (s)))); \
  	(a) += (b);
  
  /*
   * SET reads 4 input bytes in little-endian byte order and stores them
   * in a properly aligned word in host byte order.
   *
   * The check for little-endian architectures that tolerate unaligned
   * memory accesses is just an optimization.  Nothing will break if it
   * doesn't work.
   */
  #if defined(__i386__) || defined(__x86_64__) || defined(__vax__)
  #define SET(n) \
  	(*(MD5_u32plus *)&ptr[(n) * 4])
  #define GET(n) \
  	SET(n)
  #else
  #define SET(n) \
  	(ctx->block[(n)] = \
  	(MD5_u32plus)ptr[(n) * 4] | \
  	((MD5_u32plus)ptr[(n) * 4 + 1] << 8) | \
  	((MD5_u32plus)ptr[(n) * 4 + 2] << 16) | \
  	((MD5_u32plus)ptr[(n) * 4 + 3] << 24))
  #define GET(n) \
  	(ctx->block[(n)])
  #endif
  
  /*
   * This processes one or more 64-byte data blocks, but does NOT update
   * the bit counters.  There are no alignment requirements.
   */
  static void *body(MD5_CTX *ctx, void *data, unsigned long size)
  {
  	unsigned char *ptr;
  	MD5_u32plus a, b, c, d;
  	MD5_u32plus saved_a, saved_b, saved_c, saved_d;
  
  	ptr = data;
  
  	a = ctx->a;
  	b = ctx->b;
  	c = ctx->c;
  	d = ctx->d;
  
  	do {
  		saved_a = a;
  		saved_b = b;
  		saved_c = c;
  		saved_d = d;
  
  /* Round 1 */
  		STEP(F, a, b, c, d, SET(0), 0xd76aa478, 7)
  		STEP(F, d, a, b, c, SET(1), 0xe8c7b756, 12)
  		STEP(F, c, d, a, b, SET(2), 0x242070db, 17)
  		STEP(F, b, c, d, a, SET(3), 0xc1bdceee, 22)
  		STEP(F, a, b, c, d, SET(4), 0xf57c0faf, 7)
  		STEP(F, d, a, b, c, SET(5), 0x4787c62a, 12)
  		STEP(F, c, d, a, b, SET(6), 0xa8304613, 17)
  		STEP(F, b, c, d, a, SET(7), 0xfd469501, 22)
  		STEP(F, a, b, c, d, SET(8), 0x698098d8, 7)
  		STEP(F, d, a, b, c, SET(9), 0x8b44f7af, 12)
  		STEP(F, c, d, a, b, SET(10), 0xffff5bb1, 17)
  		STEP(F, b, c, d, a, SET(11), 0x895cd7be, 22)
  		STEP(F, a, b, c, d, SET(12), 0x6b901122, 7)
  		STEP(F, d, a, b, c, SET(13), 0xfd987193, 12)
  		STEP(F, c, d, a, b, SET(14), 0xa679438e, 17)
  		STEP(F, b, c, d, a, SET(15), 0x49b40821, 22)
  
  /* Round 2 */
  		STEP(G, a, b, c, d, GET(1), 0xf61e2562, 5)
  		STEP(G, d, a, b, c, GET(6), 0xc040b340, 9)
  		STEP(G, c, d, a, b, GET(11), 0x265e5a51, 14)
  		STEP(G, b, c, d, a, GET(0), 0xe9b6c7aa, 20)
  		STEP(G, a, b, c, d, GET(5), 0xd62f105d, 5)
  		STEP(G, d, a, b, c, GET(10), 0x02441453, 9)
  		STEP(G, c, d, a, b, GET(15), 0xd8a1e681, 14)
  		STEP(G, b, c, d, a, GET(4), 0xe7d3fbc8, 20)
  		STEP(G, a, b, c, d, GET(9), 0x21e1cde6, 5)
  		STEP(G, d, a, b, c, GET(14), 0xc33707d6, 9)
  		STEP(G, c, d, a, b, GET(3), 0xf4d50d87, 14)
  		STEP(G, b, c, d, a, GET(8), 0x455a14ed, 20)
  		STEP(G, a, b, c, d, GET(13), 0xa9e3e905, 5)
  		STEP(G, d, a, b, c, GET(2), 0xfcefa3f8, 9)
  		STEP(G, c, d, a, b, GET(7), 0x676f02d9, 14)
  		STEP(G, b, c, d, a, GET(12), 0x8d2a4c8a, 20)
  
  /* Round 3 */
  		STEP(H, a, b, c, d, GET(5), 0xfffa3942, 4)
  		STEP(H, d, a, b, c, GET(8), 0x8771f681, 11)
  		STEP(H, c, d, a, b, GET(11), 0x6d9d6122, 16)
  		STEP(H, b, c, d, a, GET(14), 0xfde5380c, 23)
  		STEP(H, a, b, c, d, GET(1), 0xa4beea44, 4)
  		STEP(H, d, a, b, c, GET(4), 0x4bdecfa9, 11)
  		STEP(H, c, d, a, b, GET(7), 0xf6bb4b60, 16)
  		STEP(H, b, c, d, a, GET(10), 0xbebfbc70, 23)
  		STEP(H, a, b, c, d, GET(13), 0x289b7ec6, 4)
  		STEP(H, d, a, b, c, GET(0), 0xeaa127fa, 11)
  		STEP(H, c, d, a, b, GET(3), 0xd4ef3085, 16)
  		STEP(H, b, c, d, a, GET(6), 0x04881d05, 23)
  		STEP(H, a, b, c, d, GET(9), 0xd9d4d039, 4)
  		STEP(H, d, a, b, c, GET(12), 0xe6db99e5, 11)
  		STEP(H, c, d, a, b, GET(15), 0x1fa27cf8, 16)
  		STEP(H, b, c, d, a, GET(2), 0xc4ac5665, 23)
  
  /* Round 4 */
  		STEP(I, a, b, c, d, GET(0), 0xf4292244, 6)
  		STEP(I, d, a, b, c, GET(7), 0x432aff97, 10)
  		STEP(I, c, d, a, b, GET(14), 0xab9423a7, 15)
  		STEP(I, b, c, d, a, GET(5), 0xfc93a039, 21)
  		STEP(I, a, b, c, d, GET(12), 0x655b59c3, 6)
  		STEP(I, d, a, b, c, GET(3), 0x8f0ccc92, 10)
  		STEP(I, c, d, a, b, GET(10), 0xffeff47d, 15)
  		STEP(I, b, c, d, a, GET(1), 0x85845dd1, 21)
  		STEP(I, a, b, c, d, GET(8), 0x6fa87e4f, 6)
  		STEP(I, d, a, b, c, GET(15), 0xfe2ce6e0, 10)
  		STEP(I, c, d, a, b, GET(6), 0xa3014314, 15)
  		STEP(I, b, c, d, a, GET(13), 0x4e0811a1, 21)
  		STEP(I, a, b, c, d, GET(4), 0xf7537e82, 6)
  		STEP(I, d, a, b, c, GET(11), 0xbd3af235, 10)
  		STEP(I, c, d, a, b, GET(2), 0x2ad7d2bb, 15)
  		STEP(I, b, c, d, a, GET(9), 0xeb86d391, 21)
  
  		a += saved_a;
  		b += saved_b;
  		c += saved_c;
  		d += saved_d;
  
  		ptr += 64;
  	} while (size -= 64);
  
  	ctx->a = a;
  	ctx->b = b;
  	ctx->c = c;
  	ctx->d = d;
  
  	return ptr;
  }
  
  void MD5_Init(MD5_CTX *ctx)
  {
  	ctx->a = 0x67452301;
  	ctx->b = 0xefcdab89;
  	ctx->c = 0x98badcfe;
  	ctx->d = 0x10325476;
  
  	ctx->lo = 0;
  	ctx->hi = 0;
  }
  
  void MD5_Update(MD5_CTX *ctx, void *data, unsigned long size)
  {
  	MD5_u32plus saved_lo;
  	unsigned long used, free;
  
  	saved_lo = ctx->lo;
  	if ((ctx->lo = (saved_lo + size) & 0x1fffffff) < saved_lo)
  		ctx->hi++;
  	ctx->hi += size >> 29;
  
  	used = saved_lo & 0x3f;
  
  	if (used) {
  		free = 64 - used;
  
  		if (size < free) {
  			memcpy(&ctx->buffer[used], data, size);
  			return;
  		}
  
  		memcpy(&ctx->buffer[used], data, free);
  		data = (unsigned char *)data + free;
  		size -= free;
  		body(ctx, ctx->buffer, 64);
  	}
  
  	if (size >= 64) {
  		data = body(ctx, data, size & ~(unsigned long)0x3f);
  		size &= 0x3f;
  	}
  
  	memcpy(ctx->buffer, data, size);
  }
  
  void MD5_Final(md5_hash_raw result, MD5_CTX *ctx)
  {
  	unsigned long used, free;
  
  	used = ctx->lo & 0x3f;
  
  	ctx->buffer[used++] = 0x80;
  
  	free = 64 - used;
  
  	if (free < 8) {
  		memset(&ctx->buffer[used], 0, free);
  		body(ctx, ctx->buffer, 64);
  		used = 0;
  		free = 64;
  	}
  
  	memset(&ctx->buffer[used], 0, free - 8);
  
  	ctx->lo <<= 3;
  	ctx->buffer[56] = ctx->lo;
  	ctx->buffer[57] = ctx->lo >> 8;
  	ctx->buffer[58] = ctx->lo >> 16;
  	ctx->buffer[59] = ctx->lo >> 24;
  	ctx->buffer[60] = ctx->hi;
  	ctx->buffer[61] = ctx->hi >> 8;
  	ctx->buffer[62] = ctx->hi >> 16;
  	ctx->buffer[63] = ctx->hi >> 24;
  
  	body(ctx, ctx->buffer, 64);
  
  	result[0] = ctx->a;
  	result[1] = ctx->a >> 8;
  	result[2] = ctx->a >> 16;
  	result[3] = ctx->a >> 24;
  	result[4] = ctx->b;
  	result[5] = ctx->b >> 8;
  	result[6] = ctx->b >> 16;
  	result[7] = ctx->b >> 24;
  	result[8] = ctx->c;
  	result[9] = ctx->c >> 8;
  	result[10] = ctx->c >> 16;
  	result[11] = ctx->c >> 24;
  	result[12] = ctx->d;
  	result[13] = ctx->d >> 8;
  	result[14] = ctx->d >> 16;
  	result[15] = ctx->d >> 24;
  
  	memset(ctx, 0, sizeof(*ctx));
  }
  
  //a higher level wrapper by Sten Gruener
  void md5_string(md5_hash_return* dest, char* source){
  	MD5_CTX ctx;
  	md5_hash_raw hash = {0};
  
  	int i;
  	char* temp;
  
  	MD5_Init(&ctx);
  	MD5_Update(&ctx, source, strlen(source));
  	MD5_Final(hash, &ctx);
  
  	for(i=0;i<16;i++){
  		temp = *dest + i*2;
  		if(hash[i]<16){
  			 sprintf(temp++, "0");
  		}
  		sprintf(temp, "%x", hash[i]);
  	}
  }
  