X-Git-Url: http://git.euphorik.ch/?p=crypto_lab3.git;a=blobdiff_plain;f=src%2FRsaCrt.cpp;h=869fce549eb57dc64c913a8bcc5601fa2388c843;hp=0a9273e99a229fc832aa544385189b369d423863;hb=5b2785dd710151d81e6f6af4fd6ae48521068e41;hpb=22aac262156e81085b22bdfcd0cc38950768be9b

diff --git a/src/RsaCrt.cpp b/src/RsaCrt.cpp
index 0a9273e..869fce5 100644
--- a/src/RsaCrt.cpp
+++ b/src/RsaCrt.cpp
@@ -34,22 +34,23 @@ pair<Rsa::KeyPub, RsaCrt::KeyPriv> RsaCrt::generateRSAKeys(uint exponent, uint k
 
 mpz_class RsaCrt::sign(const mpz_class& m, const KeyPriv& kPriv)
 {
-   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());
-
-   return sq + ((kPriv.qInv * (sp - sq)) % kPriv.p) * kPriv.q;
+   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());
 
-   mpz_combit(sp.get_mpz_t(), 42); // Flip the fourty second bit.
+   if (withError)
+      mpz_combit(sp.get_mpz_t(), 42); // Flip the fourty second bit.
 
    return sq + ((kPriv.qInv * (sp - sq)) % kPriv.p) * kPriv.q;
 }