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