--- /dev/null
+#pragma once
+#include <string>
+#include <array>
+
+namespace jwt {
+ namespace alphabet {
+ struct base64 {
+ static const std::array<char, 64>& data() {
+ static std::array<char, 64> data = {
+ {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
+ 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
+ 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
+ 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'}};
+ return data;
+ };
+ static const std::string& fill() {
+ static std::string fill = "=";
+ return fill;
+ }
+ };
+ struct base64url {
+ static const std::array<char, 64>& data() {
+ static std::array<char, 64> data = {
+ {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
+ 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
+ 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
+ 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '-', '_'}};
+ return data;
+ };
+ static const std::string& fill() {
+ static std::string fill = "%3d";
+ return fill;
+ }
+ };
+ }
+
+ class base {
+ public:
+ template<typename T>
+ static std::string encode(const std::string& bin) {
+ return encode(bin, T::data(), T::fill());
+ }
+ template<typename T>
+ static std::string decode(const std::string& base) {
+ return decode(base, T::data(), T::fill());
+ }
+
+ private:
+ static std::string encode(const std::string& bin, const std::array<char, 64>& alphabet, const std::string& fill) {
+ size_t size = bin.size();
+ std::string res;
+
+ // clear incomplete bytes
+ size_t fast_size = size - size % 3;
+ for (size_t i = 0; i < fast_size;) {
+ uint32_t octet_a = (unsigned char)bin[i++];
+ uint32_t octet_b = (unsigned char)bin[i++];
+ uint32_t octet_c = (unsigned char)bin[i++];
+
+ uint32_t triple = (octet_a << 0x10) + (octet_b << 0x08) + octet_c;
+
+ res += alphabet[(triple >> 3 * 6) & 0x3F];
+ res += alphabet[(triple >> 2 * 6) & 0x3F];
+ res += alphabet[(triple >> 1 * 6) & 0x3F];
+ res += alphabet[(triple >> 0 * 6) & 0x3F];
+ }
+
+ if (fast_size == size)
+ return res;
+
+ size_t mod = size % 3;
+
+ uint32_t octet_a = fast_size < size ? (unsigned char)bin[fast_size++] : 0;
+ uint32_t octet_b = fast_size < size ? (unsigned char)bin[fast_size++] : 0;
+ uint32_t octet_c = fast_size < size ? (unsigned char)bin[fast_size++] : 0;
+
+ uint32_t triple = (octet_a << 0x10) + (octet_b << 0x08) + octet_c;
+
+ switch (mod) {
+ case 1:
+ res += alphabet[(triple >> 3 * 6) & 0x3F];
+ res += alphabet[(triple >> 2 * 6) & 0x3F];
+ res += fill;
+ res += fill;
+ break;
+ case 2:
+ res += alphabet[(triple >> 3 * 6) & 0x3F];
+ res += alphabet[(triple >> 2 * 6) & 0x3F];
+ res += alphabet[(triple >> 1 * 6) & 0x3F];
+ res += fill;
+ break;
+ default:
+ break;
+ }
+
+ return res;
+ }
+
+ static std::string decode(const std::string& base, const std::array<char, 64>& alphabet, const std::string& fill) {
+ size_t size = base.size();
+
+ size_t fill_cnt = 0;
+ while (size > fill.size()) {
+ if (base.substr(size - fill.size(), fill.size()) == fill) {
+ fill_cnt++;
+ size -= fill.size();
+ if(fill_cnt > 2)
+ throw std::runtime_error("Invalid input");
+ }
+ else break;
+ }
+
+ if ((size + fill_cnt) % 4 != 0)
+ throw std::runtime_error("Invalid input");
+
+ size_t out_size = size / 4 * 3;
+ std::string res;
+ res.reserve(out_size);
+
+ auto get_sextet = [&](size_t offset) {
+ for (size_t i = 0; i < alphabet.size(); i++) {
+ if (alphabet[i] == base[offset])
+ return i;
+ }
+ throw std::runtime_error("Invalid input");
+ };
+
+
+ size_t fast_size = size - size % 4;
+ for (size_t i = 0; i < fast_size;) {
+ uint32_t sextet_a = get_sextet(i++);
+ uint32_t sextet_b = get_sextet(i++);
+ uint32_t sextet_c = get_sextet(i++);
+ uint32_t sextet_d = get_sextet(i++);
+
+ uint32_t triple = (sextet_a << 3 * 6)
+ + (sextet_b << 2 * 6)
+ + (sextet_c << 1 * 6)
+ + (sextet_d << 0 * 6);
+
+ res += (triple >> 2 * 8) & 0xFF;
+ res += (triple >> 1 * 8) & 0xFF;
+ res += (triple >> 0 * 8) & 0xFF;
+ }
+
+ if (fill_cnt == 0)
+ return res;
+
+ uint32_t triple = (get_sextet(fast_size) << 3 * 6)
+ + (get_sextet(fast_size + 1) << 2 * 6);
+
+ switch (fill_cnt) {
+ case 1:
+ triple |= (get_sextet(fast_size + 2) << 1 * 6);
+ res += (triple >> 2 * 8) & 0xFF;
+ res += (triple >> 1 * 8) & 0xFF;
+ break;
+ case 2:
+ res += (triple >> 2 * 8) & 0xFF;
+ break;
+ default:
+ break;
+ }
+
+ return res;
+ }
+ };
+}
projects / ceph.git / blobdiff