*/
#include <ctype.h>
-#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
-#include <mbedtls/cipher.h>
+#include "uencrypt.h"
-int do_crypt(FILE *infile, FILE *outfile, const mbedtls_cipher_info_t *cipher_info,
- const unsigned char *key, const unsigned char *iv, int enc, int padding)
+unsigned char *hexstr2buf(const char *str, long *len)
{
- mbedtls_cipher_context_t ctx;
- unsigned char inbuf[1024], outbuf[1024 + MBEDTLS_MAX_BLOCK_LENGTH];
- size_t inlen, outlen;
- int ret = 0;
- int step;
-
- mbedtls_cipher_init(&ctx);
- if ((ret = mbedtls_cipher_setup(&ctx, cipher_info))) {
- fprintf(stderr, "Error: mbedtls_cipher_setup: %d\n", ret);
- goto out;
- }
- step = iv ? 1024 : mbedtls_cipher_get_block_size(&ctx);
- if ((ret = mbedtls_cipher_setkey(&ctx, key, (int) mbedtls_cipher_get_key_bitlen(&ctx),
- enc ? MBEDTLS_ENCRYPT : MBEDTLS_DECRYPT))) {
- fprintf(stderr, "Error: mbedtls_cipher_setkey: %d\n", ret);
- goto out;
- }
- if (iv && (ret = mbedtls_cipher_set_iv(&ctx, iv, cipher_info->iv_size))) {
- fprintf(stderr, "Error: mbedtls_cipher_set_iv: %d\n", ret);
- goto out;
- }
+ unsigned char *buf;
+ long inlen = strlen(str);
- if (cipher_info->block_size > 1) {
- if (cipher_info->mode == MBEDTLS_MODE_CBC) {
- if ((ret = mbedtls_cipher_set_padding_mode(&ctx,
- padding ? MBEDTLS_PADDING_PKCS7
- : MBEDTLS_PADDING_NONE))) {
- fprintf(stderr, "Error: mbedtls_cipher_set_padding_mode: %d\n", ret);
- goto out;
- }
- } else {
- if (cipher_info->mode != MBEDTLS_MODE_CBC && padding) {
- fprintf(stderr, "Error: mbedTLS only supports padding with CBC ciphers.\n");
- goto out;
- }
- }
- }
+ *len = 0;
+ if (inlen % 2)
+ return NULL;
- if ((ret = mbedtls_cipher_reset(&ctx))) {
- fprintf(stderr, "Error: mbedtls_cipher_reset: %d\n", ret);
- goto out;
- }
+ *len = inlen >> 1;
+ buf = malloc(*len);
+ for (long x = 0; x < *len; x++)
+ sscanf(str + x * 2, "%2hhx", buf + x);
+ return buf;
+}
- for (;;) {
- inlen = fread(inbuf, 1, step, infile);
- if (inlen <= 0)
- break;
- if ((ret = mbedtls_cipher_update(&ctx, inbuf, inlen, outbuf, &outlen))) {
- fprintf(stderr, "Error: mbedtls_cipher_update: %d\n", ret);
- goto out;
- }
- fwrite(outbuf, 1, outlen, outfile);
- }
- if ((ret = mbedtls_cipher_finish(&ctx, outbuf, &outlen))) {
- fprintf(stderr, "Error: mbedtls_cipher_finish: %d\n", ret);
- goto out;
- }
- fwrite(outbuf, 1, outlen, outfile);
+const cipher_t *get_default_cipher(void)
+{
+ return mbedtls_cipher_info_from_type (MBEDTLS_CIPHER_AES_128_CBC);
+}
-out:
- mbedtls_cipher_free(&ctx);
- return ret;
+static char* upperstr(char *str) {
+ for (char *s = str; *s; s++)
+ *s = toupper((unsigned char) *s);
+ return str;
}
-static void check_enc_dec(const int enc)
+const cipher_t *get_cipher_or_print_error(char *name)
{
- if (enc == -1)
- return;
- fprintf(stderr, "Error: both -d and -e were specified.\n");
- exit(EXIT_FAILURE);
+ const mbedtls_cipher_info_t *cipher;
+
+ cipher = mbedtls_cipher_info_from_string(upperstr(name));
+ if (cipher)
+ return cipher;
+
+ fprintf(stderr, "Error: invalid cipher: %s.\n", name);
+ fprintf(stderr, "Supported ciphers: \n");
+ for (const int *list = mbedtls_cipher_list(); *list; list++) {
+ cipher = mbedtls_cipher_info_from_type(*list);
+ if (!cipher)
+ continue;
+ fprintf(stderr, "\t%s\n", cipher->name);
+ }
+ return NULL;
}
-static void check_cipher(const mbedtls_cipher_info_t *cipher_info)
+int get_cipher_ivsize(const cipher_t *cipher)
{
- const int *list;
-
- if (cipher_info == NULL) {
- fprintf(stderr, "Error: invalid cipher: %s.\n", optarg);
- fprintf(stderr, "Supported ciphers: \n");
- for (list = mbedtls_cipher_list(); *list; list++) {
- cipher_info = mbedtls_cipher_info_from_type(*list);
- if (!cipher_info)
- continue;
- fprintf(stderr, "\t%s\n", cipher_info->name);
- }
- exit(EXIT_FAILURE);
- }
+ const mbedtls_cipher_info_t *c = cipher;
+
+ return c->iv_size;
}
-static void show_usage(const char* name)
+int get_cipher_keysize(const cipher_t *cipher)
{
- fprintf(stderr, "Usage: %s: [-d | -e] [-n] -k key [-i iv] [-c cipher]\n"
- "-d = decrypt; -e = encrypt; -n = no padding\n", name);
+ const mbedtls_cipher_info_t *c = cipher;
+
+ return c->key_bitlen >> 3;
}
-char *hexstr2buf(const char *str, size_t *len)
+ctx_t *create_ctx(const cipher_t *cipher, const unsigned char *key,
+ const unsigned char *iv, int enc, int padding)
{
- char *buf;
- size_t inlen = strlen(str);
+ mbedtls_cipher_context_t *ctx;
+ const mbedtls_cipher_info_t *cipher_info=cipher;
+ int ret;
- *len = 0;
- if (inlen % 2)
+ ctx = malloc(sizeof (mbedtls_cipher_context_t));
+ if (!ctx) {
+ fprintf (stderr, "Error: create_ctx: out of memory.\n");
return NULL;
+ }
- *len = inlen >> 1;
- buf = malloc(*len);
- for (size_t x = 0; x < *len; x++)
- sscanf(str + x * 2, "%2hhx", buf + x);
- return buf;
-}
+ mbedtls_cipher_init(ctx);
+ ret = mbedtls_cipher_setup(ctx, cipher_info);
+ if (ret) {
+ fprintf(stderr, "Error: mbedtls_cipher_setup: %d\n", ret);
+ goto abort;
+ }
+ ret = mbedtls_cipher_setkey(ctx, key,
+ (int) mbedtls_cipher_get_key_bitlen(ctx),
+ enc ? MBEDTLS_ENCRYPT : MBEDTLS_DECRYPT);
+ if (ret) {
+ fprintf(stderr, "Error: mbedtls_cipher_setkey: %d\n", ret);
+ goto abort;
+ }
+ if (iv) {
+ ret = mbedtls_cipher_set_iv(ctx, iv, mbedtls_cipher_get_iv_size(ctx));
+ if (ret) {
+ fprintf(stderr, "Error: mbedtls_cipher_set_iv: %d\n", ret);
+ goto abort;
+ }
+ }
-static char* upperstr(char *str) {
- for (char *s = str; *s; s++)
- *s = toupper((unsigned char) *s);
- return str;
+ if (cipher_info->mode == MBEDTLS_MODE_CBC) {
+ ret = mbedtls_cipher_set_padding_mode(ctx, padding ?
+ MBEDTLS_PADDING_PKCS7 :
+ MBEDTLS_PADDING_NONE);
+ if (ret) {
+ fprintf(stderr, "Error: mbedtls_cipher_set_padding_mode: %d\n",
+ ret);
+ goto abort;
+ }
+ } else {
+ if (cipher_info->block_size > 1 && padding) {
+ fprintf(stderr,
+ "Error: mbedTLS only allows padding with CBC ciphers.\n");
+ goto abort;
+ }
+ }
+
+ ret = mbedtls_cipher_reset(ctx);
+ if (ret) {
+ fprintf(stderr, "Error: mbedtls_cipher_reset: %d\n", ret);
+ goto abort;
+ }
+ return ctx;
+
+abort:
+ free_ctx(ctx);
+ return NULL;
}
-int main(int argc, char *argv[])
+int do_crypt(FILE *infile, FILE *outfile, ctx_t *ctx)
{
- int enc = -1;
- unsigned char *iv = NULL;
- unsigned char *key = NULL;
- size_t keylen = 0, ivlen = 0;
- int opt;
- int padding = 1;
- const mbedtls_cipher_info_t *cipher_info =
- mbedtls_cipher_info_from_type (MBEDTLS_CIPHER_AES_128_CBC);
+ unsigned char inbuf[CRYPT_BUF_SIZE];
+ unsigned char outbuf[CRYPT_BUF_SIZE + MBEDTLS_MAX_BLOCK_LENGTH];
+ size_t inlen, outlen, step;
int ret;
- while ((opt = getopt(argc, argv, "c:dei:k:n")) != -1) {
- switch (opt) {
- case 'c':
- cipher_info = mbedtls_cipher_info_from_string(upperstr(optarg));
- check_cipher(cipher_info);
- break;
- case 'd':
- check_enc_dec(enc);
- enc = 0;
- break;
- case 'e':
- check_enc_dec(enc);
- enc = 1;
- break;
- case 'i':
- iv = (unsigned char *) hexstr2buf((const char *)optarg, &ivlen);
- if (iv == NULL) {
- fprintf(stderr, "Error setting IV to %s. The IV should be encoded in hex.\n",
- optarg);
- exit(EINVAL);
- }
- break;
- case 'k':
- key = (unsigned char *) hexstr2buf((const char *)optarg, &keylen);
- if (key == NULL) {
- fprintf(stderr, "Error setting key to %s. The key should be encoded in hex.\n",
- optarg);
- exit(EINVAL);
- }
- break;
- case 'n':
- padding = 0;
- break;
- default:
- show_usage(argv[0]);
- exit(EINVAL);
+ if (mbedtls_cipher_get_cipher_mode(ctx) == MBEDTLS_MODE_ECB) {
+ step = mbedtls_cipher_get_block_size(ctx);
+ if (step > CRYPT_BUF_SIZE) {
+ step = CRYPT_BUF_SIZE;
}
+ } else {
+ step = CRYPT_BUF_SIZE;
}
- if (cipher_info->iv_size) {
- if (iv == NULL) {
- fprintf(stderr, "Error: iv not set.\n");
- show_usage(argv[0]);
- exit(EXIT_FAILURE);
+
+ for (;;) {
+ inlen = fread(inbuf, 1, step, infile);
+ if (inlen <= 0)
+ break;
+ ret = mbedtls_cipher_update(ctx, inbuf, inlen, outbuf, &outlen);
+ if (ret) {
+ fprintf(stderr, "Error: mbedtls_cipher_update: %d\n", ret);
+ return ret;
}
- if (ivlen != cipher_info->iv_size) {
- fprintf(stderr, "Error: IV must be %d bytes; given IV is %zd bytes.\n",
- cipher_info->iv_size, ivlen);
- exit(EXIT_FAILURE);
+ ret = fwrite(outbuf, 1, outlen, outfile);
+ if (ret != outlen) {
+ fprintf(stderr, "Error: cipher_update short write.\n");
+ return ret - outlen;
}
}
- if (key == NULL) {
- fprintf(stderr, "Error: key not set.\n");
- show_usage(argv[0]);
- exit(EXIT_FAILURE);
+ ret = mbedtls_cipher_finish(ctx, outbuf, &outlen);
+ if (ret) {
+ fprintf(stderr, "Error: mbedtls_cipher_finish: %d\n", ret);
+ return ret;
+ }
+ ret = fwrite(outbuf, 1, outlen, outfile);
+ if (ret != outlen) {
+ fprintf(stderr, "Error: cipher_finish short write.\n");
+ return ret - outlen;
}
- if (keylen != cipher_info->key_bitlen >> 3) {
- fprintf(stderr, "Error: key must be %d bytes; given key is %zd bytes.\n",
- cipher_info->key_bitlen >> 3, keylen);
- exit(EXIT_FAILURE);
+
+ return 0;
+}
+
+void free_ctx(ctx_t *ctx)
+{
+ if (ctx) {
+ mbedtls_cipher_free(ctx);
+ free(ctx);
}
- ret = do_crypt(stdin, stdout, cipher_info, key, iv, !!enc, padding);
- if (iv)
- memset(iv, 0, ivlen);
- memset(key, 0, keylen);
- free(iv);
- free(key);
- return ret;
}
projects / openwrt / staging / dedeckeh.git / blobdiff