md2lib.ino:
#include "md2.h"
void setup() { Serial.begin(9600); }
void loop() {
char hash[33];
do_md2("The quick brown fox jumps over the lazy dog", hash);
Serial.println(hash);
delay(5000);
}
md2lib.h:
typedef struct {
unsigned char state[48];
unsigned char checksum[16];
unsigned char buffer[16];
char in_buffer;
} MD2_CTX;
void MD2Init(void *contextBuf);
static void MD2_Transform(void *contextBuf, const unsigned char *block);
void MD2Update(void *contextBuf, const unsigned char *buf, unsigned int len);
void MD2Final(unsigned char output[16], void *contextBuf);
void make_digest(char *md5str, const unsigned char *digest, int len);
void do_md2(char *arg, char *returnedHash);
md2.cpp:
# include <string.h>
typedef struct {
unsigned char state[48];
unsigned char checksum[16];
unsigned char buffer[16];
char in_buffer;
} MD2_CTX;
static const unsigned char PROGMEM MD2_S[256] = {
41, 46, 67, 201, 162, 216, 124, 1, 61, 54, 84, 161, 236, 240, 6, 19,
98, 167, 5, 243, 192, 199, 115, 140, 152, 147, 43, 217, 188, 76, 130, 202,
30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24, 138, 23, 229, 18,
190, 78, 196, 214, 218, 158, 222, 73, 160, 251, 245, 142, 187, 47, 238, 122,
169, 104, 121, 145, 21, 178, 7, 63, 148, 194, 16, 137, 11, 34, 95, 33,
128, 127, 93, 154, 90, 144, 50, 39, 53, 62, 204, 231, 191, 247, 151, 3,
255, 25, 48, 179, 72, 165, 181, 209, 215, 94, 146, 42, 172, 86, 170, 198,
79, 184, 56, 210, 150, 164, 125, 182, 118, 252, 107, 226, 156, 116, 4, 241,
69, 157, 112, 89, 100, 113, 135, 32, 134, 91, 207, 101, 230, 45, 168, 2,
27, 96, 37, 173, 174, 176, 185, 246, 28, 70, 97, 105, 52, 64, 126, 15,
85, 71, 163, 35, 221, 81, 175, 58, 195, 92, 249, 206, 186, 197, 234, 38,
44, 83, 13, 110, 133, 40, 132, 9, 211, 223, 205, 244, 65, 129, 77, 82,
106, 220, 55, 200, 108, 193, 171, 250, 36, 225, 123, 8, 12, 189, 177, 74,
120, 136, 149, 139, 227, 99, 232, 109, 233, 203, 213, 254, 59, 0, 29, 57,
242, 239, 183, 14, 102, 88, 208, 228, 166, 119, 114, 248, 235, 117, 75, 10,
49, 68, 80, 180, 143, 237, 31, 26, 219, 153, 141, 51, 159, 17, 131, 20 };
void MD2Init(void *contextBuf){
MD2_CTX *context = (MD2_CTX*)contextBuf;
memset(context, 0, sizeof(MD2_CTX));
}
static void MD2_Transform(void *contextBuf, const unsigned char *block){
MD2_CTX *context = (MD2_CTX*)contextBuf;
unsigned char i,j,t = 0;
for(i = 0; i < 16; i++) {
context->state[16+i] = block[i];
context->state[32+i] = (context->state[16+i] ^ context->state[i]);
}
for(i = 0; i < 18; i++) {
for(j = 0; j < 48; j++) {
t = context->state[j] = context->state[j] ^ MD2_S[t];
}
t += i;
}
/* Update checksum -- must be after transform to avoid fouling up last message block */
t = context->checksum[15];
for(i = 0; i < 16; i++) {
t = context->checksum[i] ^= MD2_S[block[i] ^ t];
}
}
void MD2Update(void *contextBuf, const unsigned char *buf, unsigned int len){
MD2_CTX *context = (MD2_CTX*)contextBuf;
const unsigned char *p = buf, *e = buf + len;
if (context->in_buffer) {
if (context->in_buffer + len < 16) {
/* Not enough for block, just pass into buffer */
memcpy(context->buffer + context->in_buffer, p, len);
context->in_buffer += len;
return;
}
/* Put buffered data together with inbound for a single block */
memcpy(context->buffer + context->in_buffer, p, 16 - context->in_buffer);
MD2_Transform(context, context->buffer);
p += 16 - context->in_buffer;
context->in_buffer = 0;
}
/* Process as many whole blocks as remain */
while ((p + 16) <= e) {
MD2_Transform(context, p);
p += 16;
}
/* Copy remaining data to buffer */
if (p < e) {
memcpy(context->buffer, p, e - p);
context->in_buffer = e - p;
}
}
void MD2Final(unsigned char output[16], void *contextBuf){
MD2_CTX *context = (MD2_CTX*)contextBuf;
memset(context->buffer + context->in_buffer, 16 - context->in_buffer, 16 - context->in_buffer);
MD2_Transform(context, context->buffer);
MD2_Transform(context, context->checksum);
memcpy(output, context->state, 16);
}
void make_digest(char *md5str, const unsigned char *digest, int len) /* {{{ */{
static const char hexits[17] = "0123456789abcdef";
int i;
for (i = 0; i < len; i++) {
md5str[i * 2] = hexits[digest[i] >> 4];
md5str[(i * 2) + 1] = hexits[digest[i] & 0x0F];
}
md5str[len * 2] = '\0';
}
void do_md2(char *arg, char *returnedHash){
MD2_CTX context;
unsigned char digest[16];
MD2Init(&context);
MD2Update(&context, (unsigned char*)arg, strlen(arg));
MD2Final(digest, &context);
make_digest(returnedHash, digest, 16);
}
Compilation error:
md2.cpp:9: error: expected initializer before ‘MD2_S’
md2.cpp: In function ‘void MD2_Transform(void*, const unsigned char*)’:
md2.cpp:40: error: ‘MD2_S’ was not declared in this scope
md2.cpp:47: error: ‘MD2_S’ was not declared in this scope
When I remove PROGMEM, it works. But I need save RAM.
static const unsigned char PROGMEM MD2_S[256] = {
static const unsigned char MD2_S[256] = { // OK