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Polynomialdivision 2020-03-23 19:18:13 +01:00
commit f03f55ff92
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src/crypto/crypto.c Normal file
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// based on:
// https://github.com/vedantk/gcrypt-example/blob/master/gcry.cc
#include "crypto.h"
#include <stdio.h>
#include <gcrypt.h>
#include <stdint.h>
#define GCRY_CIPHER GCRY_CIPHER_AES128 // Pick the cipher here
#define GCRY_C_MODE GCRY_CIPHER_MODE_ECB // Pick the cipher mode here
gcry_error_t gcry_error_handle;
gcry_cipher_hd_t gcry_cipher_hd;
void gcrypt_init() {
if (!gcry_check_version(GCRYPT_VERSION)) {
fprintf(stderr, "gcrypt: library version mismatch");
}
gcry_error_t err = 0;
err = gcry_control(GCRYCTL_SUSPEND_SECMEM_WARN);
err |= gcry_control(GCRYCTL_INIT_SECMEM, 16384, 0);
err |= gcry_control(GCRYCTL_RESUME_SECMEM_WARN);
err |= gcry_control(GCRYCTL_INITIALIZATION_FINISHED, 0);
if (err) {
fprintf(stderr, "gcrypt: failed initialization");
}
}
void gcrypt_set_key_and_iv(const char *key, const char *iv) {
size_t keylen = gcry_cipher_get_algo_keylen(GCRY_CIPHER);
size_t blklen = gcry_cipher_get_algo_blklen(GCRY_CIPHER);
gcry_error_handle = gcry_cipher_open(
&gcry_cipher_hd, // gcry_cipher_hd_t *
GCRY_CIPHER, // int
GCRY_C_MODE, // int
0);
if (gcry_error_handle) {
fprintf(stderr, "gcry_cipher_open failed: %s/%s\n",
gcry_strsource(gcry_error_handle),
gcry_strerror(gcry_error_handle));
return;
}
gcry_error_handle = gcry_cipher_setkey(gcry_cipher_hd, key, keylen);
if (gcry_error_handle) {
fprintf(stderr, "gcry_cipher_setkey failed: %s/%s\n",
gcry_strsource(gcry_error_handle),
gcry_strerror(gcry_error_handle));
return;
}
gcry_error_handle = gcry_cipher_setiv(gcry_cipher_hd, iv, blklen);
if (gcry_error_handle) {
fprintf(stderr, "gcry_cipher_setiv failed: %s/%s\n",
gcry_strsource(gcry_error_handle),
gcry_strerror(gcry_error_handle));
return;
}
}
// free out buffer after using!
char *gcrypt_encrypt_msg(char *msg, size_t msg_length, int *out_length) {
if (0U != (msg_length & 0xfU))
msg_length += 0x10U - (msg_length & 0xfU);
char *out = malloc(msg_length);
gcry_error_handle = gcry_cipher_encrypt(gcry_cipher_hd, out, msg_length, msg, msg_length);
if (gcry_error_handle) {
fprintf(stderr, "gcry_cipher_encrypt failed: %s/%s\n",
gcry_strsource(gcry_error_handle),
gcry_strerror(gcry_error_handle));
return NULL;
}
*out_length = msg_length;
return out;
}
// free out buffer after using!
char *gcrypt_decrypt_msg(char *msg, size_t msg_length) {
if (0U != (msg_length & 0xfU))
msg_length += 0x10U - (msg_length & 0xfU);
char *out_buffer = malloc(msg_length);
gcry_error_handle = gcry_cipher_decrypt(gcry_cipher_hd, out_buffer, msg_length, msg, msg_length);
if (gcry_error_handle) {
fprintf(stderr, "gcry_cipher_encrypt failed: %s/%s\n",
gcry_strsource(gcry_error_handle),
gcry_strerror(gcry_error_handle));
free(out_buffer);
return NULL;
}
char *out = malloc(strlen(out_buffer) + 1);
strcpy(out, out_buffer);
free(out_buffer);
return out;
}