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/*
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file is distributed
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
*
* Modified from PQCgenKAT_kem.c
* Created by Bassham, Lawrence E (Fed) on 8/29/17.
* Copyright © 2017 Bassham, Lawrence E (Fed). All rights reserved.
*/
#pragma once
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#define MAX_MARKER_LEN 50
#define NUM_OF_KATS 100
/*
* ALLOW TO READ HEXADECIMAL ENTRY (KEYS, DATA, TEXT, etc.)
*/
static inline int FindMarker(FILE *infile, const char *marker)
{
int8_t line[MAX_MARKER_LEN];
uint32_t i, len;
len = (int) strlen(marker);
if (len > (MAX_MARKER_LEN - 1)) {
len = MAX_MARKER_LEN - 1;
}
for (i = 0; i < len; i++) {
if ((line[i] = fgetc(infile)) == EOF) {
return -1;
}
}
line[len] = '\0';
while (1) {
if (!strncmp((char *) line, marker, len)) {
return 0;
}
for (i = 0; i < len - 1; i++) {
line[i] = line[i + 1];
}
if ((line[len - 1] = fgetc(infile)) == EOF) {
return -1;
}
line[len] = '\0';
}
}
/*
* ALLOW TO READ HEXADECIMAL ENTRY (KEYS, DATA, TEXT, etc.)
*/
static inline int ReadHex(FILE *infile, uint8_t *buf, uint32_t len, const char *str)
{
int ch;
int started = 0;
uint8_t ich;
if (0 == len) {
buf[0] = 0x00;
return 0;
}
memset(buf, 0x00, len);
if (FindMarker(infile, str) == -1) {
return -1;
}
while ((ch = fgetc(infile)) != EOF) {
if (!isxdigit(ch)) {
if (!started) {
if (ch == '\n')
break;
else
continue;
} else
break;
}
started = 1;
if ((ch >= '0') && (ch <= '9')) {
ich = ch - '0';
} else if ((ch >= 'A') && (ch <= 'F')) {
ich = ch - 'A' + 10;
} else if ((ch >= 'a') && (ch <= 'f')) {
ich = ch - 'a' + 10;
} else {
/* shouldn't ever get here */
ich = 0;
}
for (uint32_t i = 0; i < len - 1; i++) {
buf[i] = (buf[i] << 4) | (buf[i + 1] >> 4);
}
buf[len - 1] = (buf[len - 1] << 4) | ich;
}
return 0;
}
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