*/
#include <stdint.h>
+#include <assert.h>
#include <errno.h>
#include <pthread.h>
#include <glib.h>
#include "bluesky-private.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. */
gcry_randomize(buf, len, GCRY_STRONG_RANDOM);
}
+/* Hash a string down to an encryption key. */
+void bluesky_crypt_hash_key(const char *keystr, uint8_t *out)
+{
+ guint8 raw_csum[32];
+ gsize csum_len = sizeof(raw_csum);
+
+ assert(CRYPTO_KEY_SIZE == 16);
+
+ GChecksum *csum = g_checksum_new(G_CHECKSUM_SHA256);
+ g_checksum_update(csum, (const guchar *)keystr, strlen(keystr));
+ g_checksum_get_digest(csum, raw_csum, &csum_len);
+ g_checksum_free(csum);
+
+ memcpy(out, raw_csum, CRYPTO_KEY_SIZE);
+}
+
/* 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;
/* 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;
gcry_cipher_close(handle);
- return bluesky_string_new(out, in->len + CRYPTO_BLOCK_SIZE);
+ return bluesky_string_new(out, in->len - CRYPTO_BLOCK_SIZE);
}