[sxt] added ciphers API;

include/sxt/ciphers.h

@@ -0,0 +1,74 @@
+/*
+ * Secure eXtended Message Passing framework
+ * Secure eXtended Transport layer implementation: (libsxt)
+ * - very similar to SSH2/TLS
+ * - using already proven and tested crypto algos
+ * - better than TLS for message passing
+ *
+ * PublicPrivateKeyPairs operation API
+ *
+ * (c) Alexander Vdolainen 2016 <avdolainen@zoho.com>
+ *
+ * libsxmp is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * libsxmp is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.";
+ *
+ */
+
+#ifndef __SXT_CIPHERS_H__
+#define __SXT_CIPHERS_H__
+
+#include <sxt/lcrypt.h>
+
+struct __cipher_stype;
+
+struct _cipher_ops {
+  int (*set_encrypt_key)(struct __cipher_stype *c, void *key, void *ivec);
+  int (*set_decrypt_key)(struct __cipher_stype *c, void *key, void *ivec);
+  void (*encrypt)(struct __cipher_stype *c, void *in, void *out,
+                  unsigned long len);
+  void (*decrypt)(struct __cipher_stype *c, void *in, void *out,
+                  unsigned long len);
+};
+
+typedef struct __cipher_stype {
+  const char *name;
+  /* applied to the all ciphers */
+  unsigned int blksize; /* block size */
+  unsigned int keylen;  /* max key length */
+  unsigned int keysize; /* actual used key size */
+  /* since sxt will try to use different crypto libraries do that stuff now */
+  union {
+    struct _lcrypt_cipher_priv *lcp;
+    void *priv;
+  };
+  /* functions */
+  struct _cipher_ops *f;
+} sxt_cipher_t;
+
+/* API */
+
+/* API for workout with table */
+sxt_cipher_t *sxt_cipher_get(const char *);
+/* a little bit of internals TODO: move it out there */
+int sxt_cipher_add(const char *name, unsigned int blksize, unsigned int keylen,
+                   struct _cipher_ops *f);
+
+/* API to deal with cipher */
+const char *sxt_cipher_getname(sxt_cipher_t *);
+int sxt_cipher_set_encrypt_key(sxt_cipher_t *, void *, void *);
+int sxt_cipher_set_decrypt_key(sxt_cipher_t *, void *, void *);
+void sxt_cipher_encrypt(sxt_cipher_t *, void *, void *, unsigned long);
+void sxt_cipher_decrypt(sxt_cipher_t *, void *, void *, unsigned long);
+
+#endif /* __SXT_CIPHERS_H__ */
+

include/sxt/lcrypt.h

@@ -33,6 +33,12 @@ typedef SHA512_CTX* SHA512CTX;
 
 #define SHA512_DIGEST_LEN SHA512_DIGEST_LENGTH
 
+struct _lcrypt_cipher_priv
+{
+  void *key;
+  void *ivec;
+};
+
 /* sxt wrapper around random numbers */
 int sxt_get_random(void *data, int len, int pseudo);