1 files changed, 210 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/lib/codec/hex/hex.cpp b/comm/third_party/botan/src/lib/codec/hex/hex.cpp
new file mode 100644
index 0000000000..1ae21f398b
--- /dev/null
+++ b/comm/third_party/botan/src/lib/codec/hex/hex.cpp
@@ -0,0 +1,210 @@
+/*
+* Hex Encoding and Decoding
+* (C) 2010,2020 Jack Lloyd
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#include <botan/hex.h>
+#include <botan/mem_ops.h>
+#include <botan/exceptn.h>
+#include <botan/internal/ct_utils.h>
+
+namespace Botan {
+
+namespace {
+
+char hex_encode_nibble(uint8_t n, bool uppercase)
+   {
+   BOTAN_DEBUG_ASSERT(n <= 15);
+
+   const auto in_09 = CT::Mask<uint8_t>::is_lt(n, 10);
+
+   const char c_09 = n + '0';
+   const char c_af = n + (uppercase ? 'A' : 'a') - 10;
+
+   return in_09.select(c_09, c_af);
+   }
+
+}
+
+void hex_encode(char output[],
+                const uint8_t input[],
+                size_t input_length,
+                bool uppercase)
+   {
+   for(size_t i = 0; i != input_length; ++i)
+      {
+      const uint8_t n0 = (input[i] >> 4) & 0xF;
+      const uint8_t n1 = (input[i]     ) & 0xF;
+
+      output[2*i  ] = hex_encode_nibble(n0, uppercase);
+      output[2*i+1] = hex_encode_nibble(n1, uppercase);
+      }
+   }
+
+std::string hex_encode(const uint8_t input[],
+                       size_t input_length,
+                       bool uppercase)
+   {
+   std::string output(2 * input_length, 0);
+
+   if(input_length)
+      hex_encode(&output.front(), input, input_length, uppercase);
+
+   return output;
+   }
+
+namespace {
+
+uint8_t hex_char_to_bin(char input)
+   {
+   const uint8_t c = static_cast<uint8_t>(input);
+
+   const auto is_alpha_upper = CT::Mask<uint8_t>::is_within_range(c, uint8_t('A'), uint8_t('F'));
+   const auto is_alpha_lower = CT::Mask<uint8_t>::is_within_range(c, uint8_t('a'), uint8_t('f'));
+   const auto is_decimal     = CT::Mask<uint8_t>::is_within_range(c, uint8_t('0'), uint8_t('9'));
+
+   const auto is_whitespace  = CT::Mask<uint8_t>::is_any_of(c, {
+         uint8_t(' '), uint8_t('\t'), uint8_t('\n'), uint8_t('\r')
+      });
+
+   const uint8_t c_upper = c - uint8_t('A') + 10;
+   const uint8_t c_lower = c - uint8_t('a') + 10;
+   const uint8_t c_decim = c - uint8_t('0');
+
+   uint8_t ret = 0xFF; // default value
+
+   ret = is_alpha_upper.select(c_upper, ret);
+   ret = is_alpha_lower.select(c_lower, ret);
+   ret = is_decimal.select(c_decim, ret);
+   ret = is_whitespace.select(0x80, ret);
+
+   return ret;
+   }
+
+}
+
+
+size_t hex_decode(uint8_t output[],
+                  const char input[],
+                  size_t input_length,
+                  size_t& input_consumed,
+                  bool ignore_ws)
+   {
+   uint8_t* out_ptr = output;
+   bool top_nibble = true;
+
+   clear_mem(output, input_length / 2);
+
+   for(size_t i = 0; i != input_length; ++i)
+      {
+      const uint8_t bin = hex_char_to_bin(input[i]);
+
+      if(bin >= 0x10)
+         {
+         if(bin == 0x80 && ignore_ws)
+            continue;
+
+         std::string bad_char(1, input[i]);
+         if(bad_char == "\t")
+           bad_char = "\\t";
+         else if(bad_char == "\n")
+           bad_char = "\\n";
+
+         throw Invalid_Argument(
+           std::string("hex_decode: invalid hex character '") +
+           bad_char + "'");
+         }
+
+      if(top_nibble)
+         *out_ptr |= bin << 4;
+      else
+         *out_ptr |= bin;
+
+      top_nibble = !top_nibble;
+      if(top_nibble)
+         ++out_ptr;
+      }
+
+   input_consumed = input_length;
+   size_t written = (out_ptr - output);
+
+   /*
+   * We only got half of a uint8_t at the end; zap the half-written
+   * output and mark it as unread
+   */
+   if(!top_nibble)
+      {
+      *out_ptr = 0;
+      input_consumed -= 1;
+      }
+
+   return written;
+   }
+
+size_t hex_decode(uint8_t output[],
+                  const char input[],
+                  size_t input_length,
+                  bool ignore_ws)
+   {
+   size_t consumed = 0;
+   size_t written = hex_decode(output, input, input_length,
+                               consumed, ignore_ws);
+
+   if(consumed != input_length)
+      throw Invalid_Argument("hex_decode: input did not have full bytes");
+
+   return written;
+   }
+
+size_t hex_decode(uint8_t output[],
+                  const std::string& input,
+                  bool ignore_ws)
+   {
+   return hex_decode(output, input.data(), input.length(), ignore_ws);
+   }
+
+secure_vector<uint8_t> hex_decode_locked(const char input[],
+                                      size_t input_length,
+                                      bool ignore_ws)
+   {
+   secure_vector<uint8_t> bin(1 + input_length / 2);
+
+   size_t written = hex_decode(bin.data(),
+                               input,
+                               input_length,
+                               ignore_ws);
+
+   bin.resize(written);
+   return bin;
+   }
+
+secure_vector<uint8_t> hex_decode_locked(const std::string& input,
+                                      bool ignore_ws)
+   {
+   return hex_decode_locked(input.data(), input.size(), ignore_ws);
+   }
+
+std::vector<uint8_t> hex_decode(const char input[],
+                             size_t input_length,
+                             bool ignore_ws)
+   {
+   std::vector<uint8_t> bin(1 + input_length / 2);
+
+   size_t written = hex_decode(bin.data(),
+                               input,
+                               input_length,
+                               ignore_ws);
+
+   bin.resize(written);
+   return bin;
+   }
+
+std::vector<uint8_t> hex_decode(const std::string& input,
+                             bool ignore_ws)
+   {
+   return hex_decode(input.data(), input.size(), ignore_ws);
+   }
+
+}