Last active
March 8, 2018 12:42
-
-
Save randombit/9c024c00c5b476a0fea0c8ec7c141538 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#include <botan/fpe_fe1.h> | |
#include <assert.h> | |
#include <iostream> | |
using namespace Botan; | |
BigInt power(size_t g, size_t x) | |
{ | |
BigInt r = 1; | |
for(size_t i = 0; i != x; ++i) | |
r *= g; | |
return r; | |
} | |
BigInt rank(const std::string& s) | |
{ | |
BigInt r = 0; | |
for(size_t i = 0; i != s.size(); ++i) | |
{ | |
char c = s[i]; | |
if(::islower(c) == false) | |
throw std::runtime_error("Unexpected character in string"); | |
r *= 26; | |
r += (c - 'a'); | |
} | |
return r; | |
} | |
std::string derank(BigInt n, size_t len) | |
{ | |
std::string s; | |
for(size_t i = 0; i != len; ++i) | |
{ | |
char c = 'a' + (n % 26); | |
s.push_back(c); | |
n /= 26; | |
} | |
std::reverse(s.begin(), s.end()); | |
return s; | |
} | |
int main() | |
{ | |
const SymmetricKey key("ABCDEF"); | |
std::vector<std::string> words = { | |
"aaa", "abc", "abcc", | |
"here", "are", "some", "words", "i", "will", "encrypt", | |
"some", "are", "longer", "some", "are", "shorter", | |
"notice", "that", "some", "is", "encrypted", "differently", | |
"each", "time", "due", "to", "the", "changing", "tweak", | |
}; | |
std::vector<uint8_t> tweak(8); | |
uint64_t ctr = 0; | |
for(std::string word : words) | |
{ | |
const size_t len = word.size(); | |
BigInt r = rank(word); | |
assert(word == derank(r, len)); | |
// This could be cached instead of repeatedly computed | |
BigInt mod = power(26, len); | |
BigInt c = FPE::fe1_encrypt(mod, r, key, tweak); | |
std::string ctext = derank(c, len); | |
std::cout << word << " -> "<< ctext << "\n"; | |
BigInt p = FPE::fe1_decrypt(mod, rank(ctext), key, tweak); | |
std::string ptext = derank(p, ctext.size()); | |
assert(ptext == word); | |
++ctr; | |
store_be(ctr, tweak.data()); | |
} | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
never mind, somehow I got this working again for me.
may have been the configuration options.
This worked for me:
python configure.py --cpu=x86 --os=windows --cc=msvc