Replaced system SQLite with SQLCipher to support encrypted database

Sources/DataLiteC/libtomcrypt/stream/salsa20/salsa20_setup.c

@@ -0,0 +1,58 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
+
+/* The implementation is based on:
+ * "Salsa20 specification", http://cr.yp.to/snuffle/spec.pdf
+ * and salsa20-ref.c version 20051118
+ * Public domain from D. J. Bernstein
+ */
+
+#include "tomcrypt_private.h"
+
+#ifdef LTC_SALSA20
+
+/**
+   Initialize an Salsa20 context (only the key)
+   @param st        [out] The destination of the Salsa20 state
+   @param key       The secret key
+   @param keylen    The length of the secret key (octets)
+   @param rounds    Number of rounds (e.g. 20 for Salsa20)
+   @return CRYPT_OK if successful
+*/
+int salsa20_setup(salsa20_state *st, const unsigned char *key, unsigned long keylen, int rounds)
+{
+   const char * const sigma = "expand 32-byte k";
+   const char * const tau   = "expand 16-byte k";
+   const char *constants;
+
+   LTC_ARGCHK(st  != NULL);
+   LTC_ARGCHK(key != NULL);
+   LTC_ARGCHK(keylen == 32 || keylen == 16);
+
+   if (rounds == 0) rounds = 20;
+   LTC_ARGCHK(rounds % 2 == 0); /* number of rounds must be evenly divisible by 2 */
+
+   LOAD32L(st->input[1],  key + 0);
+   LOAD32L(st->input[2],  key + 4);
+   LOAD32L(st->input[3],  key + 8);
+   LOAD32L(st->input[4],  key + 12);
+   if (keylen == 32) { /* 256bit */
+      key += 16;
+      constants = sigma;
+   } else { /* 128bit */
+      constants = tau;
+   }
+   LOAD32L(st->input[11], key + 0);
+   LOAD32L(st->input[12], key + 4);
+   LOAD32L(st->input[13], key + 8);
+   LOAD32L(st->input[14], key + 12);
+   LOAD32L(st->input[ 0],  constants + 0);
+   LOAD32L(st->input[ 5],  constants + 4);
+   LOAD32L(st->input[10],  constants + 8);
+   LOAD32L(st->input[15],  constants + 12);
+   st->rounds = rounds;     /* default is 20 for salsa20 */
+   st->ivlen = 0;           /* will be set later by salsa20_ivctr(32|64) */
+   return CRYPT_OK;
+}
+
+#endif