221 lines
8.7 KiB
C++
221 lines
8.7 KiB
C++
#ifndef CRYPTO_HPP
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#define CRYPTO_HPP
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#include <string>
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#include <cmath>
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#include <sstream>
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#include <iomanip>
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#include <istream>
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#include <vector>
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//Moving these to a seperate namespace for minimal global namespace cluttering does not work with clang++
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#include <openssl/evp.h>
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#include <openssl/buffer.h>
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#include <openssl/sha.h>
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#include <openssl/md5.h>
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namespace SimpleWeb {
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//TODO 2017: remove workaround for MSVS 2012
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#if _MSC_VER == 1700 //MSVS 2012 has no definition for round()
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inline double round(double x) { //custom definition of round() for positive numbers
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return floor(x + 0.5);
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}
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#endif
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class Crypto {
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const static size_t buffer_size=131072;
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public:
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class Base64 {
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public:
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static std::string encode(const std::string &ascii) {
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std::string base64;
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BIO *bio, *b64;
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BUF_MEM *bptr=BUF_MEM_new();
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b64 = BIO_new(BIO_f_base64());
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BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
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bio = BIO_new(BIO_s_mem());
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BIO_push(b64, bio);
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BIO_set_mem_buf(b64, bptr, BIO_CLOSE);
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//Write directly to base64-buffer to avoid copy
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int base64_length=static_cast<int>(round(4*ceil((double)ascii.size()/3.0)));
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base64.resize(base64_length);
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bptr->length=0;
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bptr->max=base64_length+1;
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bptr->data=(char*)&base64[0];
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BIO_write(b64, &ascii[0], static_cast<int>(ascii.size()));
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BIO_flush(b64);
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//To keep &base64[0] through BIO_free_all(b64)
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bptr->length=0;
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bptr->max=0;
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bptr->data=nullptr;
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BIO_free_all(b64);
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return base64;
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}
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static std::string decode(const std::string &base64) {
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std::string ascii;
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//Resize ascii, however, the size is a up to two bytes too large.
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ascii.resize((6*base64.size())/8);
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BIO *b64, *bio;
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b64 = BIO_new(BIO_f_base64());
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BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
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bio = BIO_new_mem_buf((char*)&base64[0], static_cast<int>(base64.size()));
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bio = BIO_push(b64, bio);
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int decoded_length = BIO_read(bio, &ascii[0], static_cast<int>(ascii.size()));
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ascii.resize(decoded_length);
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BIO_free_all(b64);
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return ascii;
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}
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};
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/// Return hex string from bytes in input string.
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static std::string to_hex_string(const std::string &input) {
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std::stringstream hex_stream;
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hex_stream << std::hex << std::internal << std::setfill('0');
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for (auto &byte : input)
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hex_stream << std::setw(2) << static_cast<int>(static_cast<unsigned char>(byte));
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return hex_stream.str();
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}
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static std::string md5(const std::string &input, size_t iterations=1) {
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std::string hash;
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hash.resize(128 / 8);
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MD5(reinterpret_cast<const unsigned char*>(&input[0]), input.size(), reinterpret_cast<unsigned char*>(&hash[0]));
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for (size_t c = 1; c < iterations; ++c)
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MD5(reinterpret_cast<const unsigned char*>(&hash[0]), hash.size(), reinterpret_cast<unsigned char*>(&hash[0]));
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return hash;
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}
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static std::string md5(std::istream &stream, size_t iterations=1) {
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MD5_CTX context;
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MD5_Init(&context);
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std::streamsize read_length;
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std::vector<char> buffer(buffer_size);
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while((read_length=stream.read(&buffer[0], buffer_size).gcount())>0)
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MD5_Update(&context, buffer.data(), read_length);
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std::string hash;
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hash.resize(128 / 8);
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MD5_Final(reinterpret_cast<unsigned char*>(&hash[0]), &context);
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for (size_t c = 1; c < iterations; ++c)
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MD5(reinterpret_cast<const unsigned char*>(&hash[0]), hash.size(), reinterpret_cast<unsigned char*>(&hash[0]));
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return hash;
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}
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static std::string sha1(const std::string &input, size_t iterations=1) {
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std::string hash;
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hash.resize(160 / 8);
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SHA1(reinterpret_cast<const unsigned char*>(&input[0]), input.size(), reinterpret_cast<unsigned char*>(&hash[0]));
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for (size_t c = 1; c < iterations; ++c)
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SHA1(reinterpret_cast<const unsigned char*>(&hash[0]), hash.size(), reinterpret_cast<unsigned char*>(&hash[0]));
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return hash;
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}
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static std::string sha1(std::istream &stream, size_t iterations=1) {
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SHA_CTX context;
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SHA1_Init(&context);
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std::streamsize read_length;
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std::vector<char> buffer(buffer_size);
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while((read_length=stream.read(&buffer[0], buffer_size).gcount())>0)
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SHA1_Update(&context, buffer.data(), read_length);
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std::string hash;
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hash.resize(160 / 8);
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SHA1_Final(reinterpret_cast<unsigned char*>(&hash[0]), &context);
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for (size_t c = 1; c < iterations; ++c)
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SHA1(reinterpret_cast<const unsigned char*>(&hash[0]), hash.size(), reinterpret_cast<unsigned char*>(&hash[0]));
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return hash;
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}
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static std::string sha256(const std::string &input, size_t iterations=1) {
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std::string hash;
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hash.resize(256 / 8);
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SHA256(reinterpret_cast<const unsigned char*>(&input[0]), input.size(), reinterpret_cast<unsigned char*>(&hash[0]));
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for (size_t c = 1; c < iterations; ++c)
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SHA256(reinterpret_cast<const unsigned char*>(&hash[0]), hash.size(), reinterpret_cast<unsigned char*>(&hash[0]));
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return hash;
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}
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static std::string sha256(std::istream &stream, size_t iterations=1) {
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SHA256_CTX context;
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SHA256_Init(&context);
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std::streamsize read_length;
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std::vector<char> buffer(buffer_size);
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while((read_length=stream.read(&buffer[0], buffer_size).gcount())>0)
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SHA256_Update(&context, buffer.data(), read_length);
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std::string hash;
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hash.resize(256 / 8);
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SHA256_Final(reinterpret_cast<unsigned char*>(&hash[0]), &context);
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for (size_t c = 1; c < iterations; ++c)
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SHA256(reinterpret_cast<const unsigned char*>(&hash[0]), hash.size(), reinterpret_cast<unsigned char*>(&hash[0]));
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return hash;
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}
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static std::string sha512(const std::string &input, size_t iterations=1) {
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std::string hash;
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hash.resize(512 / 8);
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SHA512(reinterpret_cast<const unsigned char*>(&input[0]), input.size(), reinterpret_cast<unsigned char*>(&hash[0]));
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for (size_t c = 1; c < iterations; ++c)
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SHA512(reinterpret_cast<const unsigned char*>(&hash[0]), hash.size(), reinterpret_cast<unsigned char*>(&hash[0]));
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return hash;
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}
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static std::string sha512(std::istream &stream, size_t iterations=1) {
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SHA512_CTX context;
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SHA512_Init(&context);
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std::streamsize read_length;
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std::vector<char> buffer(buffer_size);
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while((read_length=stream.read(&buffer[0], buffer_size).gcount())>0)
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SHA512_Update(&context, buffer.data(), read_length);
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std::string hash;
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hash.resize(512 / 8);
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SHA512_Final(reinterpret_cast<unsigned char*>(&hash[0]), &context);
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for (size_t c = 1; c < iterations; ++c)
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SHA512(reinterpret_cast<const unsigned char*>(&hash[0]), hash.size(), reinterpret_cast<unsigned char*>(&hash[0]));
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return hash;
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}
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/// key_size is number of bytes of the returned key.
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static std::string pbkdf2(const std::string &password, const std::string &salt, int iterations, int key_size) {
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std::string key;
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key.resize(key_size);
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PKCS5_PBKDF2_HMAC_SHA1(password.c_str(), password.size(),
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reinterpret_cast<const unsigned char*>(salt.c_str()), salt.size(), iterations,
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key_size, reinterpret_cast<unsigned char*>(&key[0]));
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return key;
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}
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};
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}
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#endif /* CRYPTO_HPP */
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