Replaced system SQLite with SQLCipher to support encrypted database

Sources/DataLiteC/libtomcrypt/pk/rsa/rsa_import_x509.c

@@ -0,0 +1,54 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
+#include "tomcrypt_private.h"
+
+/**
+  @file rsa_import.c
+  Import an RSA key from a X.509 certificate, Steffen Jaeckel
+*/
+
+#ifdef LTC_MRSA
+
+static int s_rsa_decode(const unsigned char *in, unsigned long inlen, rsa_key *key)
+{
+   /* now it should be SEQUENCE { INTEGER, INTEGER } */
+   return der_decode_sequence_multi(in, inlen,
+                                        LTC_ASN1_INTEGER, 1UL, key->N,
+                                        LTC_ASN1_INTEGER, 1UL, key->e,
+                                        LTC_ASN1_EOL,     0UL, NULL);
+}
+
+/**
+  Import an RSA key from a X.509 certificate
+  @param in      The packet to import from
+  @param inlen   It's length (octets)
+  @param key     [out] Destination for newly imported key
+  @return CRYPT_OK if successful, upon error allocated memory is freed
+*/
+int rsa_import_x509(const unsigned char *in, unsigned long inlen, rsa_key *key)
+{
+   int           err;
+
+   LTC_ARGCHK(in          != NULL);
+   LTC_ARGCHK(key         != NULL);
+   LTC_ARGCHK(ltc_mp.name != NULL);
+
+   /* init key */
+   if ((err = rsa_init(key)) != CRYPT_OK) {
+      return err;
+   }
+
+   if ((err = x509_decode_public_key_from_certificate(in, inlen,
+                                                      LTC_OID_RSA,
+                                                      LTC_ASN1_NULL, NULL, NULL,
+                                                      (public_key_decode_cb)s_rsa_decode, key)) != CRYPT_OK) {
+      rsa_free(key);
+   } else {
+      key->type = PK_PUBLIC;
+   }
+
+   return err;
+}
+
+#endif /* LTC_MRSA */
+