添加文本转换器代码

others/C++/text converter/src/SHA256Converter.cpp

@@ -0,0 +1,23 @@
+#include "../include/SHA256Converter.hpp"
+#include <openssl/evp.h>
+#include <sstream>
+#include <iomanip>
+
+std::string SHA256Converter::convert(const std::string& input) {
+    EVP_MD_CTX* mdctx = EVP_MD_CTX_new();
+    const EVP_MD* md = EVP_sha256();
+    unsigned char digest[EVP_MAX_MD_SIZE];
+    unsigned int digest_len;
+
+    EVP_DigestInit_ex(mdctx, md, nullptr);
+    EVP_DigestUpdate(mdctx, input.c_str(), input.length());
+    EVP_DigestFinal_ex(mdctx, digest, &digest_len);
+    EVP_MD_CTX_free(mdctx);
+
+    std::stringstream ss;
+    for(unsigned int i = 0; i < digest_len; i++) {
+        ss << std::hex << std::setw(2) << std::setfill('0') << (int)digest[i];
+    }
+
+    return ss.str();
+}