Replaced system SQLite with SQLCipher to support encrypted database

Sources/DataLiteC/libtomcrypt/pk/ecc/ecc_sign_hash_rfc7518.c

@@ -0,0 +1,73 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
+
+#include "tomcrypt_private.h"
+
+#ifdef LTC_MECC
+
+/**
+  Sign a message digest (RFC7518 format + recovery_id)
+  @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 recid     [out] Recovery ID
+  @param key       A private ECC key
+  @return CRYPT_OK if successful
+*/
+int ecc_sign_hash_rfc7518_ex(const unsigned char *in,  unsigned long inlen,
+                             unsigned char *out, unsigned long *outlen,
+                             prng_state *prng, int wprng,
+                             int *recid, const ecc_key *key)
+{
+   int err;
+   void *r, *s;
+   unsigned long pbytes, i;
+
+   LTC_ARGCHK(out    != NULL);
+   LTC_ARGCHK(outlen != NULL);
+   LTC_ARGCHK(key    != NULL);
+
+   /* RFC7518 format - raw (r,s) */
+   pbytes = ltc_mp_unsigned_bin_size(key->dp.order);
+   if (*outlen < 2 * pbytes) {
+      *outlen = 2 * pbytes;
+      return CRYPT_BUFFER_OVERFLOW;
+   }
+
+   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, recid, key)) != CRYPT_OK) goto error;
+
+   zeromem(out, 2 * pbytes);
+   *outlen = 2 * pbytes;
+   i = ltc_mp_unsigned_bin_size(r);
+   if ((err = ltc_mp_to_unsigned_bin(r, out + pbytes - i)) != CRYPT_OK) goto error;
+   i = ltc_mp_unsigned_bin_size(s);
+   err = ltc_mp_to_unsigned_bin(s, out + 2 * pbytes - i);
+
+error:
+   ltc_mp_deinit_multi(r, s, LTC_NULL);
+   return err;
+}
+
+/**
+  Sign a message digest (RFC7518 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_rfc7518(const unsigned char *in,  unsigned long inlen,
+                          unsigned char *out, unsigned long *outlen,
+                          prng_state *prng, int wprng, const ecc_key *key)
+{
+   return ecc_sign_hash_rfc7518_ex(in, inlen, out, outlen, prng, wprng, NULL, key);
+}
+
+#endif