static void
test(u1 *data, u4 len, u1 *correct_digest)
{
u1 digest[20];
void *ctx;
int i;
ctx = SHA1_Init();
if(ctx == NULL) {
printf("no memory\n");
exit(1);
}
SHA1_Calc(ctx, data, len);
SHA1_Finish(ctx, digest);
if(memcmp(correct_digest, digest, 20)) {
printf("correct is :");
for(i = 0;i < 20;i++)
printf("%02x ", correct_digest[i]);
printf("\n");
printf("result is :");
for(i = 0;i < 20;i++)
printf("%02x ", digest[i]);
printf("\n");
}
else {
printf("test passed: ");
for(i = 0;i < 20;i++)
printf("%02x ", digest[i]);
printf("\n");
}
}
void process_jpeg(void *ptr, size_t sz, const char *filename)
{
SHA1_CTX hashsum;
SHA1_Init(&hashsum);
int state = STATE_0;
int want_data = 1;
uint8_t *c = ptr;
for (; sz > 0; --sz, ++c)
{
if (state == STATE_0)
{
if (*c == 0xFF)
{
state = STATE_FF;
}
else
{
if (want_data) SHA1_Update(&hashsum, c, 1);
}
}
else
{
assert(state == STATE_FF);
if (*c != 0x00)
{
// This is a new section
want_data = want_type[*c];
}
if (want_data) SHA1_Update(&hashsum, c-1, 2);
state = STATE_0;
}
}
if (state == STATE_FF && want_data)
{
SHA1_Update(&hashsum, c-1, 1);
}
/*
* Construct the hexdigest
*/
char sha[SHA1_DIGEST_STRING_LENGTH];
uint8_t digest[20];
SHA1_Finish(&hashsum, digest);
for (int i = 0; i < 20; ++i)
{
sha[2*i] = hex[digest[i] >> 4];
sha[2*i+1] = hex[digest[i] & 15];
}
sha[SHA1_DIGEST_STRING_LENGTH-1] = '\000';
printf("%s\t%s\n", sha, filename);
}