Replaced system SQLite with SQLCipher to support encrypted database

Sources/DataLiteC/libtomcrypt/pk/ecc/ecc_verify_hash_eth27.c

@@ -0,0 +1,53 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
+
+#include "tomcrypt_private.h"
+
+#ifdef LTC_MECC
+
+/**
+  @file ecc_verify_hash.c
+  ECC Crypto, Tom St Denis
+*/
+
+/**
+   Verify an ECC signature (Ethereum format with recovery_id+27)
+   @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_eth27(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);
+   LTC_ARGCHK(key != NULL);
+
+   /* Only valid for secp256k1 - OID 1.3.132.0.10 */
+   if (pk_oid_cmp_with_ulong("1.3.132.0.10", key->dp.oid, key->dp.oidlen) != CRYPT_OK) {
+      return CRYPT_ERROR;
+   }
+   /* Only secp256k1 curves uses this format, so must be 65 bytes long */
+   if (siglen != 65) {
+      return CRYPT_INVALID_PACKET;
+   }
+
+   if ((err = ltc_mp_init_multi(&r, &s, LTC_NULL)) != CRYPT_OK) return err;
+   if ((err = ltc_mp_read_unsigned_bin(r, (unsigned char *)sig, 32)) != CRYPT_OK) goto error;
+   if ((err = ltc_mp_read_unsigned_bin(s, (unsigned char *)sig + 32, 32)) != 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