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#include "rsa.h"
#include <library/cpp/openssl/big_integer/big_integer.h>
#include <library/cpp/openssl/init/init.h>
#include <util/generic/yexception.h>
#include <util/generic/buffer.h>
#include <openssl/bn.h>
#include <openssl/rsa.h>
using namespace NOpenSsl;
using namespace NOpenSsl::NRsa;
namespace {
struct TInit {
inline TInit() {
InitOpenSSL();
}
} INIT;
}
TPublicKey::TPublicKey(const TBigInteger& e, const TBigInteger& n)
: Key_(RSA_new())
{
Y_ENSURE(Key_, "RSA_new() failed");
RSA_set0_key(Key_, BN_dup(n.Impl()), BN_dup(e.Impl()), nullptr);
}
TPublicKey::~TPublicKey() noexcept {
RSA_free(Key_);
}
size_t TPublicKey::OutputLength() const noexcept {
return RSA_size(Key_);
}
size_t TPublicKey::EncryptNoPad(void* dst, const void* src, size_t size) const {
auto len = RSA_public_encrypt(size, (const ui8*)src, (ui8*)dst, Key_, RSA_NO_PADDING);
Y_ENSURE(len >= 0, "RSA_public_encrypt() failed");
return len;
}
TBigInteger TPublicKey::EncryptNoPad(const TBigInteger& src) const {
const auto len1 = OutputLength();
const auto len2 = src.NumBytes();
TBuffer buf(len1 + len2);
char* buf1 = (char*)buf.Data();
char* buf2 = buf1 + len1;
return TBigInteger::FromRegion(buf1, EncryptNoPad(buf1, buf2, src.ToRegion(buf2)));
}
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