43 lines
1.2 KiB
C++
43 lines
1.2 KiB
C++
#include "us/Crypto_Basic.hpp"
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namespace qing {
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std::string Crypto_Basic::bytes_to_hex(const std::vector<unsigned char>& data) {
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static const char hex_chars[] = "0123456789abcdef";
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std::string hex_string;
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hex_string.reserve(data.size() * 2);
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for (unsigned char byte: data) {
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hex_string.push_back(hex_chars[byte >> 4]); // 高4位
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hex_string.push_back(hex_chars[byte & 0x0F]); // 低4位
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}
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return hex_string;
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}
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std::vector<unsigned char> Crypto_Basic::hex_to_bytes(const std::string &hex) {
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// 检查长度是否为偶数
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if (hex.size() % 2 != 0) {
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throw std::invalid_argument("十六进制字符串长度必须为偶数");
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}
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std::vector<unsigned char> bytes;
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bytes.reserve(hex.size() / 2);
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auto char_to_nibble = [](char c) -> unsigned char {
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if (c >= '0' && c <= '9') return c - '0';
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if (c >= 'a' && c <= 'f') return 10 + (c - 'a');
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if (c >= 'A' && c <= 'F') return 10 + (c - 'A');
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throw std::invalid_argument("无效的十六进制字符：" + std::string(1, c));
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};
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for (size_t i = 0; i < hex.size(); i += 2) {
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unsigned char high = char_to_nibble(hex[i]);
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unsigned char low = char_to_nibble(hex[i + 1]);
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bytes.push_back((high << 4) | low);
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}
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return bytes;
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}
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}
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