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-rw-r--r--comm/third_party/botan/src/lib/codec/base64/base64.cpp248
1 files changed, 248 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/lib/codec/base64/base64.cpp b/comm/third_party/botan/src/lib/codec/base64/base64.cpp
new file mode 100644
index 0000000000..93675f0e34
--- /dev/null
+++ b/comm/third_party/botan/src/lib/codec/base64/base64.cpp
@@ -0,0 +1,248 @@
+/*
+* Base64 Encoding and Decoding
+* (C) 2010,2015,2020 Jack Lloyd
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#include <botan/base64.h>
+#include <botan/internal/codec_base.h>
+#include <botan/exceptn.h>
+#include <botan/internal/rounding.h>
+#include <botan/internal/ct_utils.h>
+
+namespace Botan {
+
+namespace {
+
+class Base64 final
+ {
+ public:
+ static inline std::string name() noexcept
+ {
+ return "base64";
+ }
+
+ static inline size_t encoding_bytes_in() noexcept
+ {
+ return m_encoding_bytes_in;
+ }
+ static inline size_t encoding_bytes_out() noexcept
+ {
+ return m_encoding_bytes_out;
+ }
+
+ static inline size_t decoding_bytes_in() noexcept
+ {
+ return m_encoding_bytes_out;
+ }
+ static inline size_t decoding_bytes_out() noexcept
+ {
+ return m_encoding_bytes_in;
+ }
+
+ static inline size_t bits_consumed() noexcept
+ {
+ return m_encoding_bits;
+ }
+ static inline size_t remaining_bits_before_padding() noexcept
+ {
+ return m_remaining_bits_before_padding;
+ }
+
+ static inline size_t encode_max_output(size_t input_length)
+ {
+ return (round_up(input_length, m_encoding_bytes_in) / m_encoding_bytes_in) * m_encoding_bytes_out;
+ }
+ static inline size_t decode_max_output(size_t input_length)
+ {
+ return (round_up(input_length, m_encoding_bytes_out) * m_encoding_bytes_in) / m_encoding_bytes_out;
+ }
+
+ static void encode(char out[8], const uint8_t in[5]) noexcept;
+
+ static uint8_t lookup_binary_value(char input) noexcept;
+
+ static bool check_bad_char(uint8_t bin, char input, bool ignore_ws);
+
+ static void decode(uint8_t* out_ptr, const uint8_t decode_buf[4])
+ {
+ out_ptr[0] = (decode_buf[0] << 2) | (decode_buf[1] >> 4);
+ out_ptr[1] = (decode_buf[1] << 4) | (decode_buf[2] >> 2);
+ out_ptr[2] = (decode_buf[2] << 6) | decode_buf[3];
+ }
+
+ static inline size_t bytes_to_remove(size_t final_truncate)
+ {
+ return final_truncate;
+ }
+
+ private:
+ static const size_t m_encoding_bits = 6;
+ static const size_t m_remaining_bits_before_padding = 8;
+
+ static const size_t m_encoding_bytes_in = 3;
+ static const size_t m_encoding_bytes_out = 4;
+ };
+
+char lookup_base64_char(uint8_t x)
+ {
+ BOTAN_DEBUG_ASSERT(x < 64);
+
+ const auto in_az = CT::Mask<uint8_t>::is_within_range(x, 26, 51);
+ const auto in_09 = CT::Mask<uint8_t>::is_within_range(x, 52, 61);
+ const auto eq_plus = CT::Mask<uint8_t>::is_equal(x, 62);
+ const auto eq_slash = CT::Mask<uint8_t>::is_equal(x, 63);
+
+ const char c_AZ = 'A' + x;
+ const char c_az = 'a' + (x - 26);
+ const char c_09 = '0' + (x - 2*26);
+ const char c_plus = '+';
+ const char c_slash = '/';
+
+ char ret = c_AZ;
+ ret = in_az.select(c_az, ret);
+ ret = in_09.select(c_09, ret);
+ ret = eq_plus.select(c_plus, ret);
+ ret = eq_slash.select(c_slash, ret);
+
+ return ret;
+ }
+
+//static
+void Base64::encode(char out[8], const uint8_t in[5]) noexcept
+ {
+ const uint8_t b0 = (in[0] & 0xFC) >> 2;
+ const uint8_t b1 = ((in[0] & 0x03) << 4) | (in[1] >> 4);
+ const uint8_t b2 = ((in[1] & 0x0F) << 2) | (in[2] >> 6);
+ const uint8_t b3 = in[2] & 0x3F;
+ out[0] = lookup_base64_char(b0);
+ out[1] = lookup_base64_char(b1);
+ out[2] = lookup_base64_char(b2);
+ out[3] = lookup_base64_char(b3);
+ }
+
+//static
+uint8_t Base64::lookup_binary_value(char input) noexcept
+ {
+ 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('Z'));
+ const auto is_alpha_lower = CT::Mask<uint8_t>::is_within_range(c, uint8_t('a'), uint8_t('z'));
+ const auto is_decimal = CT::Mask<uint8_t>::is_within_range(c, uint8_t('0'), uint8_t('9'));
+
+ const auto is_plus = CT::Mask<uint8_t>::is_equal(c, uint8_t('+'));
+ const auto is_slash = CT::Mask<uint8_t>::is_equal(c, uint8_t('/'));
+ const auto is_equal = CT::Mask<uint8_t>::is_equal(c, uint8_t('='));
+
+ 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');
+ const uint8_t c_lower = c - uint8_t('a') + 26;
+ const uint8_t c_decim = c - uint8_t('0') + 2*26;
+
+ 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_plus.select(62, ret);
+ ret = is_slash.select(63, ret);
+ ret = is_equal.select(0x81, ret);
+ ret = is_whitespace.select(0x80, ret);
+
+ return ret;
+ }
+
+//static
+bool Base64::check_bad_char(uint8_t bin, char input, bool ignore_ws)
+ {
+ if(bin <= 0x3F)
+ {
+ return true;
+ }
+ else if(!(bin == 0x81 || (bin == 0x80 && ignore_ws)))
+ {
+ std::string bad_char(1, input);
+ if(bad_char == "\t")
+ { bad_char = "\\t"; }
+ else if(bad_char == "\n")
+ { bad_char = "\\n"; }
+ else if(bad_char == "\r")
+ { bad_char = "\\r"; }
+
+ throw Invalid_Argument(
+ std::string("base64_decode: invalid base64 character '") +
+ bad_char + "'");
+ }
+ return false;
+ }
+
+}
+
+size_t base64_encode(char out[],
+ const uint8_t in[],
+ size_t input_length,
+ size_t& input_consumed,
+ bool final_inputs)
+ {
+ return base_encode(Base64(), out, in, input_length, input_consumed, final_inputs);
+ }
+
+std::string base64_encode(const uint8_t input[],
+ size_t input_length)
+ {
+ return base_encode_to_string(Base64(), input, input_length);
+ }
+
+size_t base64_decode(uint8_t out[],
+ const char in[],
+ size_t input_length,
+ size_t& input_consumed,
+ bool final_inputs,
+ bool ignore_ws)
+ {
+ return base_decode(Base64(), out, in, input_length, input_consumed, final_inputs, ignore_ws);
+ }
+
+size_t base64_decode(uint8_t output[],
+ const char input[],
+ size_t input_length,
+ bool ignore_ws)
+ {
+ return base_decode_full(Base64(), output, input, input_length, ignore_ws);
+ }
+
+size_t base64_decode(uint8_t output[],
+ const std::string& input,
+ bool ignore_ws)
+ {
+ return base64_decode(output, input.data(), input.length(), ignore_ws);
+ }
+
+secure_vector<uint8_t> base64_decode(const char input[],
+ size_t input_length,
+ bool ignore_ws)
+ {
+ return base_decode_to_vec<secure_vector<uint8_t>>(Base64(), input, input_length, ignore_ws);
+ }
+
+secure_vector<uint8_t> base64_decode(const std::string& input,
+ bool ignore_ws)
+ {
+ return base64_decode(input.data(), input.size(), ignore_ws);
+ }
+
+size_t base64_encode_max_output(size_t input_length)
+ {
+ return Base64::encode_max_output(input_length);
+ }
+
+size_t base64_decode_max_output(size_t input_length)
+ {
+ return Base64::decode_max_output(input_length);
+ }
+
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-08-02 11:08:36 +0000