43 lines
923 B
C++
43 lines
923 B
C++
#include <algorithm>
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#include <cassert>
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#include <iostream>
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#include <set>
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#include <string>
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#include <openssl/evp.h>
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using MD5Digest = unsigned char[EVP_MAX_MD_SIZE];
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unsigned int md5(MD5Digest digest, std::string const& s)
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{
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EVP_MD const* md{EVP_md5()};
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unsigned int md_len;
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EVP_MD_CTX* md_ctxt{EVP_MD_CTX_new()};
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assert(md_ctxt != NULL);
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EVP_DigestInit_ex2(md_ctxt, md, NULL);
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EVP_DigestUpdate(md_ctxt, s.data(), s.length());
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EVP_DigestFinal_ex(md_ctxt, digest, &md_len);
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return md_len;
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}
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bool is_valid(std::string const& s)
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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] == 0;
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}
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int main(int argc, char** argv)
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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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} |