X-Git-Url: http://git.euphorik.ch/?a=blobdiff_plain;f=src%2FRsaCrt.cpp;h=95f5993d1c1dfc176b82db0649b7bf1090969508;hb=HEAD;hp=ff3f21e6d951f396d69964804d965ecad52e6dd0;hpb=d061bc06b7e5681e9da4c2c0b7642f50d126ff76;p=crypto_lab3.git

diff --git a/src/RsaCrt.cpp b/src/RsaCrt.cpp
index ff3f21e..95f5993 100644
--- a/src/RsaCrt.cpp
+++ b/src/RsaCrt.cpp
@@ -26,18 +26,31 @@ pair<Rsa::KeyPub, RsaCrt::KeyPriv> RsaCrt::generateRSAKeys(uint exponent, uint k
    kPriv.dp = d % (kPriv.p - 1);
    kPriv.dq = d % (kPriv.q - 1);
 
-   // qInv = q^-1 (mod p)
+   // qInv = q^-1 (mod p).
    mpz_invert(kPriv.qInv.get_mpz_t(), kPriv.q.get_mpz_t(), kPriv.p.get_mpz_t());
 
    return make_pair(kPub, kPriv);
 }
 
 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;
 }