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/*
* keygen.c
*
* RSA key generator for the suspend and resume tools.
*
* Copyright (C) 2006 Rafael J. Wysocki <rjw@sisk.pl>
*
* This file is released under the GPLv2.
*
*/
#include "config.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <termios.h>
#include "md5.h"
#include "encrypt.h"
#define MIN_KEY_BITS 1024
#define MAX_KEY_BITS 4096
#define MAX_OUT_SIZE (sizeof(struct RSA_data))
#define MAX_STR_LEN 256
#define DEFAULT_FILE "uswsusp.key"
static char in_buffer[MAX_STR_LEN];
static char pass_buf[MAX_STR_LEN];
static struct RSA_data rsa;
static unsigned char encrypt_buffer[RSA_DATA_SIZE];
int main(int argc, char *argv[])
{
gcry_ac_data_t rsa_data_set;
gcry_ac_handle_t rsa_hd;
gcry_ac_key_t rsa_priv;
gcry_ac_key_pair_t rsa_key_pair;
gcry_mpi_t mpi;
size_t offset;
int len = MIN_KEY_BITS, ret = EXIT_SUCCESS;
struct termios termios;
char *vrfy_buf;
struct md5_ctx ctx;
unsigned char key_buf[PK_KEY_SIZE];
gcry_cipher_hd_t sym_hd;
unsigned char ivec[PK_CIPHER_BLOCK];
unsigned short size;
int j, fd;
printf("libgcrypt version: %s\n", gcry_check_version(NULL));
gcry_control(GCRYCTL_INIT_SECMEM, 4096, 0);
ret = gcry_ac_open(&rsa_hd, GCRY_AC_RSA, 0);
if (ret)
return ret;
do {
printf("Key bits (between %d and %d inclusive) [%d]: ",
MIN_KEY_BITS, MAX_KEY_BITS, len);
fgets(in_buffer, MAX_STR_LEN, stdin);
if (strlen(in_buffer) && *in_buffer != '\n')
sscanf(in_buffer, "%d", &len);
} while (len < MIN_KEY_BITS || len > MAX_KEY_BITS);
Retry:
printf("Generating %d-bit RSA keys. Please wait.\n", len);
ret = gcry_ac_key_pair_generate(rsa_hd, len, NULL, &rsa_key_pair, NULL);
if (ret) {
fprintf(stderr, "Key generation failed: %s\n", gcry_strerror(ret));
ret = EXIT_FAILURE;
goto Close_RSA;
}
printf("Testing the private key. Please wait.\n");
rsa_priv = gcry_ac_key_pair_extract(rsa_key_pair, GCRY_AC_KEY_SECRET);
ret = gcry_ac_key_test(rsa_hd, rsa_priv);
if (ret) {
printf("RSA key test failed. Retrying.\n");
goto Retry;
}
rsa_data_set = gcry_ac_key_data_get(rsa_priv);
if (gcry_ac_data_length(rsa_data_set) != RSA_FIELDS) {
fprintf(stderr, "Wrong number of key fields\n");
ret = -EINVAL;
goto Free_RSA;
}
/* Copy the public key components to struct RSA_data */
offset = 0;
for (j = 0; j < RSA_FIELDS_PUB; j++) {
char *str;
size_t s;
gcry_ac_data_get_index(rsa_data_set, GCRY_AC_FLAG_COPY, j,
(const char **)&str, &mpi);
ret = gcry_mpi_print(GCRYMPI_FMT_USG, rsa.data + offset,
RSA_DATA_SIZE - offset, &s, mpi);
if (ret) {
fprintf(stderr, "RSA key components too big\n");
goto Free_RSA;
}
rsa.field[j][0] = str[0];
rsa.field[j][1] = '\0';
rsa.size[j] = s;
offset += s;
gcry_mpi_release(mpi);
gcry_free(str);
}
tcgetattr(0, &termios);
termios.c_lflag &= ~ECHO;
termios.c_lflag |= ICANON | ECHONL;
tcsetattr(0, TCSANOW, &termios);
vrfy_buf = (char *)encrypt_buffer;
do {
do {
printf("Passphrase please (must be non-empty): ");
fgets(pass_buf, MAX_STR_LEN, stdin);
len = strlen(pass_buf) - 1;
} while (len <= 0);
if (pass_buf[len] == '\n')
pass_buf[len] = '\0';
printf("Confirm passphrase: ");
fgets(vrfy_buf, MAX_STR_LEN, stdin);
if (vrfy_buf[len] == '\n')
vrfy_buf[len] = '\0';
} while (strncmp(pass_buf, vrfy_buf, MAX_STR_LEN));
termios.c_lflag |= ECHO;
tcsetattr(0, TCSANOW, &termios);
memset(ivec, 0, PK_CIPHER_BLOCK);
strncpy((char *)ivec, pass_buf, PK_CIPHER_BLOCK);
md5_init_ctx(&ctx);
md5_process_bytes(pass_buf, strlen(pass_buf), &ctx);
md5_finish_ctx(&ctx, key_buf);
/* First, we encrypt the key test */
ret = gcry_cipher_open(&sym_hd, PK_CIPHER, GCRY_CIPHER_MODE_CFB,
GCRY_CIPHER_SECURE);
if (ret)
goto Free_RSA;
ret = gcry_cipher_setkey(sym_hd, key_buf, PK_KEY_SIZE);
if (!ret)
ret = gcry_cipher_setiv(sym_hd, ivec, PK_CIPHER_BLOCK);
if (!ret)
ret = gcry_cipher_encrypt(sym_hd, rsa.key_test, KEY_TEST_SIZE,
KEY_TEST_DATA, KEY_TEST_SIZE);
gcry_cipher_close(sym_hd);
if (ret)
goto Free_RSA;
/* Now, we can encrypt the private RSA key */
ret = gcry_cipher_open(&sym_hd, PK_CIPHER, GCRY_CIPHER_MODE_CFB,
GCRY_CIPHER_SECURE);
if (ret)
goto Free_RSA;
ret = gcry_cipher_setkey(sym_hd, key_buf, PK_KEY_SIZE);
if (!ret)
ret = gcry_cipher_setiv(sym_hd, ivec, PK_CIPHER_BLOCK);
if (ret)
goto Free_sym;
/* Copy the private key components (encrypted) to struct RSA_data */
for (j = RSA_FIELDS_PUB; j < RSA_FIELDS; j++) {
char *str;
size_t s;
gcry_ac_data_get_index(rsa_data_set, GCRY_AC_FLAG_COPY, j,
(const char **)&str, &mpi);
ret = gcry_mpi_print(GCRYMPI_FMT_USG, rsa.data + offset,
RSA_DATA_SIZE - offset, &s, mpi);
if (ret) {
fprintf(stderr, "RSA key components too big\n");
goto Free_sym;
}
/* We encrypt the data in place */
ret = gcry_cipher_encrypt(sym_hd, rsa.data + offset, s, NULL, 0);
if (ret)
goto Free_sym;
rsa.field[j][0] = str[0];
rsa.field[j][1] = '\0';
rsa.size[j] = s;
offset += s;
gcry_mpi_release(mpi);
gcry_free(str);
}
size = offset + sizeof(struct RSA_data) - RSA_DATA_SIZE;
printf("File name [%s]: ", DEFAULT_FILE);
fgets(in_buffer, MAX_STR_LEN, stdin);
if (!strlen(in_buffer) || *in_buffer == '\n')
strcpy(in_buffer, DEFAULT_FILE);
else if (in_buffer[strlen(in_buffer)-1] == '\n')
in_buffer[strlen(in_buffer)-1] = '\0';
fd = open(in_buffer, O_RDWR | O_CREAT | O_TRUNC, 00600);
if (fd >= 0) {
write(fd, &rsa, size);
close(fd);
} else {
fprintf(stderr, "Could not open the file %s\n", in_buffer);
ret = EXIT_FAILURE;
}
Free_sym:
gcry_cipher_close(sym_hd);
Free_RSA:
gcry_ac_data_destroy(rsa_data_set);
Close_RSA:
gcry_ac_close(rsa_hd);
return ret;
}
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