Replaced system SQLite with SQLCipher to support encrypted database

Sources/DataLiteC/libtomcrypt/pk/ecc/ecc_sign_hash_rfc5656.c

@@ -0,0 +1,48 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
+
+#include "tomcrypt_private.h"
+
+#if defined(LTC_MECC) && defined(LTC_SSH)
+
+/**
+  Sign a message digest (RFC5656 / SSH format)
+  @param in        The message digest to sign
+  @param inlen     The length of the digest
+  @param out       [out] The destination for the signature
+  @param outlen    [in/out] The max size and resulting size of the signature
+  @param prng      An active PRNG state
+  @param wprng     The index of the PRNG you wish to use
+  @param key       A private ECC key
+  @return CRYPT_OK if successful
+*/
+int ecc_sign_hash_rfc5656(const unsigned char *in,  unsigned long inlen,
+                          unsigned char *out, unsigned long *outlen,
+                          prng_state *prng, int wprng, const ecc_key *key)
+{
+   int err;
+   void *r, *s;
+   char name[64];
+   unsigned long namelen = sizeof(name);
+
+   LTC_ARGCHK(out    != NULL);
+   LTC_ARGCHK(outlen != NULL);
+
+   /* Get identifier string */
+   if ((err = ecc_ssh_ecdsa_encode_name(name, &namelen, key)) != CRYPT_OK) return err;
+
+   if ((err = ltc_mp_init_multi(&r, &s, LTC_NULL)) != CRYPT_OK) return err;
+   if ((err = ecc_sign_hash_internal(in, inlen, r, s, prng, wprng, NULL, key)) != CRYPT_OK) goto error;
+
+   /* Store as SSH data sequence, per RFC4251 */
+   err = ssh_encode_sequence_multi(out, outlen,
+                                   LTC_SSHDATA_STRING, name, namelen,
+                                   LTC_SSHDATA_MPINT,  r,
+                                   LTC_SSHDATA_MPINT,  s,
+                                   LTC_SSHDATA_EOL,    LTC_NULL);
+error:
+   ltc_mp_deinit_multi(r, s, LTC_NULL);
+   return err;
+}
+
+#endif