#include "bluesky.h"
+static int DISABLE_CRYPTO = 1;
+
/* Cryptographic operations. The rest of the BlueSky code merely calls into
* the functions in this file, so this is the only point where we interface
* with an external cryptographic library. */
-#define CRYPTO_BLOCK_SIZE 16 /* 128-bit AES */
-#define CRYPTO_KEY_SIZE 16
-
GCRY_THREAD_OPTION_PTHREAD_IMPL;
void bluesky_crypt_init()
if (gcry_control(GCRYCTL_INITIALIZATION_FINISHED_P))
return;
- g_print("libgcrypt not yet initialized, initializing...\n");
-
if (!gcry_check_version(GCRYPT_VERSION))
g_error("libgcrypt version mismatch\n");
/* Encrypt a data block. */
BlueSkyRCStr *bluesky_crypt_encrypt(BlueSkyRCStr *in, const uint8_t *key)
{
+ if (DISABLE_CRYPTO) {
+ bluesky_string_ref(in);
+ return in;
+ }
+
gcry_error_t status;
gcry_cipher_hd_t handle;
gcry_strerror(status));
}
- gcry_cipher_encrypt(handle, out + CRYPTO_BLOCK_SIZE, in->len,
- in->data, in->len);
+ status = gcry_cipher_encrypt(handle, out + CRYPTO_BLOCK_SIZE, in->len,
+ in->data, in->len);
if (status) {
g_error("gcrypt error encrypting: %s\n",
gcry_strerror(status));
return bluesky_string_new(out, in->len + CRYPTO_BLOCK_SIZE);
}
+
+/* Decrypt a data block. */
+BlueSkyRCStr *bluesky_crypt_decrypt(BlueSkyRCStr *in, const uint8_t *key)
+{
+ if (DISABLE_CRYPTO) {
+ bluesky_string_ref(in);
+ return in;
+ }
+
+ gcry_error_t status;
+ gcry_cipher_hd_t handle;
+
+ g_return_val_if_fail(in->len > CRYPTO_BLOCK_SIZE, NULL);
+
+ status = gcry_cipher_open(&handle, GCRY_CIPHER_AES, GCRY_CIPHER_MODE_CBC,
+ GCRY_CIPHER_CBC_CTS);
+ if (status) {
+ g_error("gcrypt error setting up encryption: %s\n",
+ gcry_strerror(status));
+ }
+
+ uint8_t *out = g_malloc0(in->len - CRYPTO_BLOCK_SIZE);
+
+ gcry_cipher_setkey(handle, key, CRYPTO_KEY_SIZE);
+ if (status) {
+ g_error("gcrypt error setting key: %s\n",
+ gcry_strerror(status));
+ }
+
+ status = gcry_cipher_setiv(handle, in->data, CRYPTO_BLOCK_SIZE);
+ if (status) {
+ g_error("gcrypt error setting IV: %s\n",
+ gcry_strerror(status));
+ }
+
+ status = gcry_cipher_decrypt(handle, out, in->len - CRYPTO_BLOCK_SIZE,
+ in->data + CRYPTO_BLOCK_SIZE,
+ in->len - CRYPTO_BLOCK_SIZE);
+ if (status) {
+ g_error("gcrypt error decrypting: %s\n",
+ gcry_strerror(status));
+ }
+
+ gcry_cipher_close(handle);
+
+ return bluesky_string_new(out, in->len + CRYPTO_BLOCK_SIZE);
+}