Replaced system SQLite with SQLCipher to support encrypted database

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

@@ -0,0 +1,47 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
+
+#include "tomcrypt_private.h"
+
+#if defined(LTC_MECC) && defined(LTC_DER)
+
+/**
+  @file ecc_verify_hash.c
+  ECC Crypto, Tom St Denis
+*/
+
+/**
+   Verify an ECC signature (ANSI X9.62 format)
+   @param sig         The signature to verify
+   @param siglen      The length of the signature (octets)
+   @param hash        The hash (message digest) that was signed
+   @param hashlen     The length of the hash (octets)
+   @param stat        [out] Result of signature, 1==valid, 0==invalid
+   @param key         The corresponding public ECC key
+   @return CRYPT_OK if successful (even if the signature is not valid)
+*/
+int ecc_verify_hash(const unsigned char *sig,  unsigned long siglen,
+                    const unsigned char *hash, unsigned long hashlen,
+                    int *stat, const ecc_key *key)
+{
+   void *r, *s;
+   int err;
+
+   LTC_ARGCHK(sig != NULL);
+
+   if ((err = ltc_mp_init_multi(&r, &s, NULL)) != CRYPT_OK) return err;
+
+   /* ANSI X9.62 format - ASN.1 encoded SEQUENCE{ INTEGER(r), INTEGER(s) }  */
+   if ((err = der_decode_sequence_multi_ex(sig, siglen, LTC_DER_SEQ_SEQUENCE | LTC_DER_SEQ_STRICT,
+                                     LTC_ASN1_INTEGER, 1UL, r,
+                                     LTC_ASN1_INTEGER, 1UL, s,
+                                     LTC_ASN1_EOL, 0UL, LTC_NULL)) != CRYPT_OK)                         { goto error; }
+
+   err = ecc_verify_hash_internal(r, s, hash, hashlen, stat, key);
+
+error:
+   ltc_mp_deinit_multi(r, s, LTC_NULL);
+   return err;
+}
+
+#endif