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/*
* Copyright 2018-present MongoDB, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License 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.
*/
#include "kms_message_private.h"
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
char *
hexlify (const uint8_t *buf, size_t len)
{
char *hex_chars = malloc (len * 2 + 1);
KMS_ASSERT (hex_chars);
char *p = hex_chars;
size_t i;
for (i = 0; i < len; i++) {
p += sprintf (p, "%02x", buf[i]);
}
*p = '\0';
return hex_chars;
}
/* Returns -1 on error. */
int
unhexlify (const char *in, size_t len)
{
int i;
int byte;
int total = 0;
int multiplier = 1;
for (i = (int) len - 1; i >= 0; i--) {
char c = *(in + i);
if (c >= '0' && c <= '9') {
byte = c - 48;
} else if (c >= 'a' && c <= 'f') {
byte = c - 97 + 10;
} else if (c >= 'A' && c <= 'F') {
byte = c - 65 + 10;
} else {
return -1;
}
total += byte * multiplier;
multiplier *= 16;
}
return total;
}
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