X-Git-Url: http://git.euphorik.ch/?a=blobdiff_plain;f=src%2FRsaCrt.cpp;h=869fce549eb57dc64c913a8bcc5601fa2388c843;hb=5b2785dd710151d81e6f6af4fd6ae48521068e41;hp=ff3f21e6d951f396d69964804d965ecad52e6dd0;hpb=d061bc06b7e5681e9da4c2c0b7642f50d126ff76;p=crypto_lab3.git

diff --git a/src/RsaCrt.cpp b/src/RsaCrt.cpp
index ff3f21e..869fce5 100644
--- a/src/RsaCrt.cpp
+++ b/src/RsaCrt.cpp
@@ -33,11 +33,24 @@ pair<Rsa::KeyPub, RsaCrt::KeyPriv> RsaCrt::generateRSAKeys(uint exponent, uint k
 }
 
 mpz_class RsaCrt::sign(const mpz_class& m, const KeyPriv& kPriv)
+{
+   return sign(m, kPriv, false);
+}
+
+mpz_class RsaCrt::signWithFaultySp(const mpz_class& m, const KeyPriv& kPriv)
+{
+   return sign(m, kPriv, true);
+}
+
+mpz_class RsaCrt::sign(const mpz_class& m, const KeyPriv& kPriv, bool withError)
 {
    mpz_class sp, sq;
 
    mpz_powm_sec(sp.get_mpz_t(), m.get_mpz_t(), kPriv.dp.get_mpz_t(), kPriv.p.get_mpz_t());
    mpz_powm_sec(sq.get_mpz_t(), m.get_mpz_t(), kPriv.dq.get_mpz_t(), kPriv.q.get_mpz_t());
 
+   if (withError)
+      mpz_combit(sp.get_mpz_t(), 42); // Flip the fourty second bit.
+
    return sq + ((kPriv.qInv * (sp - sq)) % kPriv.p) * kPriv.q;
 }