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-rw-r--r--src/lib/codec/hex/hex.cpp204
1 files changed, 204 insertions, 0 deletions
diff --git a/src/lib/codec/hex/hex.cpp b/src/lib/codec/hex/hex.cpp
new file mode 100644
index 000000000..104125894
--- /dev/null
+++ b/src/lib/codec/hex/hex.cpp
@@ -0,0 +1,204 @@
+/*
+* Hex Encoding and Decoding
+* (C) 2010 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#include <botan/hex.h>
+#include <botan/mem_ops.h>
+#include <stdexcept>
+
+namespace Botan {
+
+void hex_encode(char output[],
+ const byte input[],
+ size_t input_length,
+ bool uppercase)
+ {
+ static const byte BIN_TO_HEX_UPPER[16] = {
+ '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
+ 'A', 'B', 'C', 'D', 'E', 'F' };
+
+ static const byte BIN_TO_HEX_LOWER[16] = {
+ '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
+ 'a', 'b', 'c', 'd', 'e', 'f' };
+
+ const byte* tbl = uppercase ? BIN_TO_HEX_UPPER : BIN_TO_HEX_LOWER;
+
+ for(size_t i = 0; i != input_length; ++i)
+ {
+ byte x = input[i];
+ output[2*i ] = tbl[(x >> 4) & 0x0F];
+ output[2*i+1] = tbl[(x ) & 0x0F];
+ }
+ }
+
+std::string hex_encode(const byte input[],
+ size_t input_length,
+ bool uppercase)
+ {
+ std::string output(2 * input_length, 0);
+
+ if(input_length)
+ hex_encode(&output[0], input, input_length, uppercase);
+
+ return output;
+ }
+
+size_t hex_decode(byte output[],
+ const char input[],
+ size_t input_length,
+ size_t& input_consumed,
+ bool ignore_ws)
+ {
+ /*
+ * Mapping of hex characters to either their binary equivalent
+ * or to an error code.
+ * If valid hex (0-9 A-F a-f), the value.
+ * If whitespace, then 0x80
+ * Otherwise 0xFF
+ * Warning: this table assumes ASCII character encodings
+ */
+
+ static const byte HEX_TO_BIN[256] = {
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x80,
+ 0x80, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0x80, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x01,
+ 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E,
+ 0x0F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x0A, 0x0B, 0x0C,
+ 0x0D, 0x0E, 0x0F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
+
+ byte* out_ptr = output;
+ bool top_nibble = true;
+
+ clear_mem(output, input_length / 2);
+
+ for(size_t i = 0; i != input_length; ++i)
+ {
+ const byte bin = HEX_TO_BIN[static_cast<byte>(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 std::invalid_argument(
+ std::string("hex_decode: invalid hex character '") +
+ bad_char + "'");
+ }
+
+ *out_ptr |= bin << (top_nibble*4);
+
+ 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 byte 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(byte 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 std::invalid_argument("hex_decode: input did not have full bytes");
+
+ return written;
+ }
+
+size_t hex_decode(byte output[],
+ const std::string& input,
+ bool ignore_ws)
+ {
+ return hex_decode(output, &input[0], input.length(), ignore_ws);
+ }
+
+secure_vector<byte> hex_decode_locked(const char input[],
+ size_t input_length,
+ bool ignore_ws)
+ {
+ secure_vector<byte> bin(1 + input_length / 2);
+
+ size_t written = hex_decode(&bin[0],
+ input,
+ input_length,
+ ignore_ws);
+
+ bin.resize(written);
+ return bin;
+ }
+
+secure_vector<byte> hex_decode_locked(const std::string& input,
+ bool ignore_ws)
+ {
+ return hex_decode_locked(&input[0], input.size(), ignore_ws);
+ }
+
+std::vector<byte> hex_decode(const char input[],
+ size_t input_length,
+ bool ignore_ws)
+ {
+ std::vector<byte> bin(1 + input_length / 2);
+
+ size_t written = hex_decode(&bin[0],
+ input,
+ input_length,
+ ignore_ws);
+
+ bin.resize(written);
+ return bin;
+ }
+
+std::vector<byte> hex_decode(const std::string& input,
+ bool ignore_ws)
+ {
+ return hex_decode(&input[0], input.size(), ignore_ws);
+ }
+
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-19 23:52:27 +0000