43 lines
981 B
C++
43 lines
981 B
C++
#include <algorithm>
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#include <array>
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#include <cassert>
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#include <iostream>
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#include <string>
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#include <openssl/evp.h>
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using MD5Digest = std::array<unsigned char, EVP_MAX_MD_SIZE>;
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auto md5(MD5Digest& digest, std::string const& s) -> unsigned int
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{
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EVP_MD const* md{EVP_md5()};
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unsigned int md_len{0};
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EVP_MD_CTX* md_context{EVP_MD_CTX_new()};
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assert(md_context != nullptr);
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EVP_DigestInit_ex2(md_context, md, nullptr);
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EVP_DigestUpdate(md_context, s.data(), s.length());
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EVP_DigestFinal_ex(md_context, digest.data(), &md_len);
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return md_len;
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}
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auto is_valid(std::string const& s) -> bool
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{
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MD5Digest digest;
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auto len = md5(digest, s);
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assert(len >= 3);
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return digest[0] == 0 && digest[1] == 0 && (digest[2] & 0xf0) == 0;
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}
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auto main() -> int
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{
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for (std::string line; std::getline(std::cin, line);) {
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unsigned i = 0;
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while (!is_valid(line + std::to_string(i))) {
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++i;
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}
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std::cout << "Value = " << i << "\n";
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}
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return 0;
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} |