Replaced system SQLite with SQLCipher to support encrypted database

Sources/DataLiteC/libtomcrypt/pk/asn1/der/integer/der_decode_integer.c

@@ -0,0 +1,68 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
+#include "tomcrypt_private.h"
+
+/**
+  @file der_decode_integer.c
+  ASN.1 DER, decode an integer, Tom St Denis
+*/
+
+
+#ifdef LTC_DER
+
+/**
+  Read a mp_int integer
+  @param in       The DER encoded data
+  @param inlen    Size of DER encoded data
+  @param num      The first mp_int to decode
+  @return CRYPT_OK if successful
+*/
+int der_decode_integer(const unsigned char *in, unsigned long inlen, void *num)
+{
+   unsigned long x, y;
+   int           err;
+
+   LTC_ARGCHK(num    != NULL);
+   LTC_ARGCHK(in     != NULL);
+
+   /* min DER INTEGER is 0x02 01 00 == 0 */
+   if (inlen < (1 + 1 + 1)) {
+      return CRYPT_INVALID_PACKET;
+   }
+
+   /* ok expect 0x02 when we AND with 0001 1111 [1F] */
+   x = 0;
+   if ((in[x++] & 0x1F) != 0x02) {
+      return CRYPT_INVALID_PACKET;
+   }
+
+   /* get the length of the data */
+   inlen -= x;
+   if ((err = der_decode_asn1_length(in + x, &inlen, &y)) != CRYPT_OK) {
+      return err;
+   }
+   x += inlen;
+
+   if ((err = ltc_mp_read_unsigned_bin(num, (unsigned char *)in + x, y)) != CRYPT_OK) {
+      return err;
+   }
+
+   /* see if it's negative */
+   if (in[x] & 0x80) {
+      void *tmp;
+      if (ltc_mp_init(&tmp) != CRYPT_OK) {
+         return CRYPT_MEM;
+      }
+
+      if (ltc_mp_2expt(tmp, ltc_mp_count_bits(num)) != CRYPT_OK || ltc_mp_sub(num, tmp, num) != CRYPT_OK) {
+         ltc_mp_clear(tmp);
+         return CRYPT_MEM;
+      }
+      ltc_mp_clear(tmp);
+   }
+
+   return CRYPT_OK;
+
+}
+
+#endif

Sources/DataLiteC/libtomcrypt/pk/asn1/der/integer/der_encode_integer.c

@@ -0,0 +1,111 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
+#include "tomcrypt_private.h"
+
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wconversion"
+#pragma clang diagnostic ignored "-Wshorten-64-to-32"
+
+/**
+  @file der_encode_integer.c
+  ASN.1 DER, encode an integer, Tom St Denis
+*/
+
+
+#ifdef LTC_DER
+
+/* Exports a positive bignum as DER format (upto 2^32 bytes in size) */
+/**
+  Store a mp_int integer
+  @param num      The first mp_int to encode
+  @param out      [out] The destination for the DER encoded integers
+  @param outlen   [in/out] The max size and resulting size of the DER encoded integers
+  @return CRYPT_OK if successful
+*/
+int der_encode_integer(void *num, unsigned char *out, unsigned long *outlen)
+{
+   unsigned long tmplen, y, len;
+   int           err, leading_zero;
+
+   LTC_ARGCHK(num    != NULL);
+   LTC_ARGCHK(out    != NULL);
+   LTC_ARGCHK(outlen != NULL);
+
+   /* find out how big this will be */
+   if ((err = der_length_integer(num, &tmplen)) != CRYPT_OK) {
+      return err;
+   }
+
+   if (*outlen < tmplen) {
+      *outlen = tmplen;
+      return CRYPT_BUFFER_OVERFLOW;
+   }
+
+   if (ltc_mp_cmp_d(num, 0) != LTC_MP_LT) {
+      /* we only need a leading zero if the msb of the first byte is one */
+      if ((ltc_mp_count_bits(num) & 7) == 0 || ltc_mp_iszero(num) == LTC_MP_YES) {
+         leading_zero = 1;
+      } else {
+         leading_zero = 0;
+      }
+
+      /* get length of num in bytes (plus 1 since we force the msbyte to zero) */
+      y = ltc_mp_unsigned_bin_size(num) + leading_zero;
+   } else {
+      leading_zero = 0;
+      y            = ltc_mp_count_bits(num);
+      y            = y + (8 - (y & 7));
+      y            = y >> 3;
+      if (((ltc_mp_cnt_lsb(num)+1)==ltc_mp_count_bits(num)) && ((ltc_mp_count_bits(num)&7)==0)) --y;
+   }
+
+   /* now store initial data */
+   *out++ = 0x02;
+   len = *outlen - 1;
+   if ((err = der_encode_asn1_length(y, out, &len)) != CRYPT_OK) {
+      return err;
+   }
+   out += len;
+
+   /* now store msbyte of zero if num is non-zero */
+   if (leading_zero) {
+      *out++ = 0x00;
+   }
+
+   /* if it's not zero store it as big endian */
+   if (ltc_mp_cmp_d(num, 0) == LTC_MP_GT) {
+      /* now store the mpint */
+      if ((err = ltc_mp_to_unsigned_bin(num, out)) != CRYPT_OK) {
+          return err;
+      }
+   } else if (ltc_mp_iszero(num) != LTC_MP_YES) {
+      void *tmp;
+
+      /* negative */
+      if (ltc_mp_init(&tmp) != CRYPT_OK) {
+         return CRYPT_MEM;
+      }
+
+      /* 2^roundup and subtract */
+      y = ltc_mp_count_bits(num);
+      y = y + (8 - (y & 7));
+      if (((ltc_mp_cnt_lsb(num)+1)==ltc_mp_count_bits(num)) && ((ltc_mp_count_bits(num)&7)==0)) y -= 8;
+      if (ltc_mp_2expt(tmp, y) != CRYPT_OK || ltc_mp_add(tmp, num, tmp) != CRYPT_OK) {
+         ltc_mp_clear(tmp);
+         return CRYPT_MEM;
+      }
+      if ((err = ltc_mp_to_unsigned_bin(tmp, out)) != CRYPT_OK) {
+         ltc_mp_clear(tmp);
+         return err;
+      }
+      ltc_mp_clear(tmp);
+   }
+
+   /* we good */
+   *outlen = tmplen;
+   return CRYPT_OK;
+}
+
+#endif
+
+#pragma clang diagnostic pop

Sources/DataLiteC/libtomcrypt/pk/asn1/der/integer/der_length_integer.c

@@ -0,0 +1,55 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
+#include "tomcrypt_private.h"
+
+/**
+  @file der_length_integer.c
+  ASN.1 DER, get length of encoding, Tom St Denis
+*/
+
+
+#ifdef LTC_DER
+/**
+  Gets length of DER encoding of num
+  @param num    The int to get the size of
+  @param outlen [out] The length of the DER encoding for the given integer
+  @return CRYPT_OK if successful
+*/
+int der_length_integer(void *num, unsigned long *outlen)
+{
+   unsigned long z, len;
+   int           leading_zero, err;
+
+   LTC_ARGCHK(num     != NULL);
+   LTC_ARGCHK(outlen  != NULL);
+
+   if (ltc_mp_cmp_d(num, 0) != LTC_MP_LT) {
+      /* positive */
+
+      /* we only need a leading zero if the msb of the first byte is one */
+      if ((ltc_mp_count_bits(num) & 7) == 0 || ltc_mp_iszero(num) == LTC_MP_YES) {
+         leading_zero = 1;
+      } else {
+         leading_zero = 0;
+      }
+
+      /* size for bignum */
+      len = leading_zero + ltc_mp_unsigned_bin_size(num);
+   } else {
+      /* it's negative */
+      /* find power of 2 that is a multiple of eight and greater than count bits */
+      z = ltc_mp_count_bits(num);
+      z = z + (8 - (z & 7));
+      if (((ltc_mp_cnt_lsb(num)+1)==ltc_mp_count_bits(num)) && ((ltc_mp_count_bits(num)&7)==0)) --z;
+      len = z >> 3;
+   }
+
+   if ((err = der_length_asn1_length(len, &z)) != CRYPT_OK) {
+      return err;
+   }
+   *outlen = 1 + z + len;
+
+   return CRYPT_OK;
+}
+
+#endif