#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <openssl/evp.h>

#include "types.h"

u16 const crc16_table[256] = { 
0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241, 0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1,
0xC481, 0x0440, 0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40, 0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901,
0x09C0, 0x0880, 0xC841, 0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40, 0x1E00, 0xDEC1, 0xDF81, 0x1F40, 
0xDD01, 0x1DC0, 0x1C80, 0xDC41, 0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641, 0xD201, 0x12C0, 0x1380, 
0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040, 0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240, 0x3600, 0xF6C1, 
0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441, 0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41, 0xFA01, 
0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840, 0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41, 
0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40, 0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 
0x2640, 0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041, 0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 
0xA281, 0x6240, 0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441, 0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 
0x6FC0, 0x6E80, 0xAE41, 0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840, 0x7800, 0xB8C1, 0xB981, 0x7940, 
0xBB01, 0x7BC0, 0x7A80, 0xBA41, 0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40, 0xB401, 0x74C0, 0x7580, 
0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640, 0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041, 0x5000, 0x90C1, 
0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241, 0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440, 0x9C01, 
0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40, 0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841, 
0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40, 0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 
0x8C41, 0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641, 0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 
0x8081, 0x4040
};

void md5_print(u8 *buf) {
	int i;

	for(i = 0; i < 16; i++)
		printf("%02x", buf[i]);
}

void md5_buf(u8 *buf, u8 *out, size_t len) {
	EVP_MD_CTX mdctx;
	u32 md_len=0;

	EVP_DigestInit(&mdctx, EVP_md5());
	EVP_DigestUpdate(&mdctx, (void*)buf, len);
	EVP_DigestFinal_ex(&mdctx, out, &md_len);
	EVP_MD_CTX_cleanup(&mdctx);
}


u16 crc16(u8 *buf, u32 size, u16 seed)
{
	u16 crc = seed;
	u8 val;

	while(size>0)
	{
		size--;
		val = *buf++;
		crc = crc16_table[(val ^ crc) & 0xff] ^ (crc >> 8);
	}

	return crc;
}


u16 calc_crc16(u8 *buf, u32 size, u16 seed, u16 outxor)
{
	return crc16(buf, size, seed) ^ outxor;
}

void xor(u8 *in, u32 len, u8 *out, u8 *key, u32 keylen) {
	int i;
	u8 kb;

	for(i = 0; i < len; i++) {
		kb = key[i % keylen];

		if (out == NULL)
			in[i] ^= kb;
		else
			out[i] = in[i] ^ kb;
	}
}

u16 getle16(const void* ptr)
{
	u8* p = (u8*)ptr;
	
	return p[0] | (p[1]<<8);
}

u16 getbe16(const void* ptr)
{
	u8* p = (u8*)ptr;
	
	return (p[0]<<8) | (p[1]<<0);
}

u32 getle32(const void* ptr)
{
	u8* p = (u8*)ptr;
	
	return (p[0]<<0) | (p[1]<<8) | (p[2]<<16) | (p[3]<<24);
}

u32 getbe32(const void* ptr)
{
	u8* p = (u8*)ptr;
	
	return (p[0]<<24) | (p[1]<<16) | (p[2]<<8) | (p[3]<<0);
}

u64 getle64(const void* ptr)
{
	u8* p = (u8*)ptr;
	u64 n = p[0];

	n |= (u64)p[1]<<8;
	n |= (u64)p[2]<<16;
	n |= (u64)p[3]<<24;
	n |= (u64)p[4]<<32;
	n |= (u64)p[5]<<40;
	n |= (u64)p[6]<<48;
	n |= (u64)p[7]<<56;
	return n;
}

u64 getbe64(const void* ptr)
{
	u8* p = (u8*)ptr;
	u64 n = 0;

	n |= (u64)p[0]<<56;
	n |= (u64)p[1]<<48;
	n |= (u64)p[2]<<40;
	n |= (u64)p[3]<<32;
	n |= (u64)p[4]<<24;
	n |= (u64)p[5]<<16;
	n |= (u64)p[6]<<8;
	n |= (u64)p[7]<<0;
	return n;
}


void hexdump(void *ptr, int buflen) {
  unsigned char *buf = (unsigned char*)ptr;
  int i, j;
  for (i=0; i<buflen; i+=16) {
    printf("%06x: ", i);
    for (j=0; j<16; j++) 
      if (i+j < buflen)
        printf("%02x ", buf[i+j]);
      else
        printf("   ");
    printf(" ");
    for (j=0; j<16; j++) 
      if (i+j < buflen)
        printf("%c", isprint(buf[i+j]) ? buf[i+j] : '.');
    printf("\n");
  }
}

