diff options
| -rw-r--r-- | src/ringct/rctSigs.cpp | 45 |
1 files changed, 36 insertions, 9 deletions
diff --git a/src/ringct/rctSigs.cpp b/src/ringct/rctSigs.cpp index ae0ee21c8..63b4e0a0c 100644 --- a/src/ringct/rctSigs.cpp +++ b/src/ringct/rctSigs.cpp @@ -118,19 +118,32 @@ namespace rct { } //see above. - bool verifyBorromean(const boroSig &bb, const key64 P1, const key64 P2) { + bool verifyBorromean(const boroSig &bb, const ge_p3 P1[64], const ge_p3 P2[64]) { key64 Lv1; key chash, LL; int ii = 0; + ge_p2 p2; for (ii = 0 ; ii < 64 ; ii++) { - addKeys2(LL, bb.s0[ii], bb.ee, P1[ii]); + // equivalent of: addKeys2(LL, bb.s0[ii], bb.ee, P1[ii]); + ge_double_scalarmult_base_vartime(&p2, bb.ee.bytes, &P1[ii], bb.s0[ii].bytes); + ge_tobytes(LL.bytes, &p2); chash = hash_to_scalar(LL); - addKeys2(Lv1[ii], bb.s1[ii], chash, P2[ii]); + // equivalent of: addKeys2(Lv1[ii], bb.s1[ii], chash, P2[ii]); + ge_double_scalarmult_base_vartime(&p2, chash.bytes, &P2[ii], bb.s1[ii].bytes); + ge_tobytes(Lv1[ii].bytes, &p2); } key eeComputed = hash_to_scalar(Lv1); //hash function fine return equalKeys(eeComputed, bb.ee); } - + bool verifyBorromean(const boroSig &bb, const key64 P1, const key64 P2) { + ge_p3 P1_p3[64], P2_p3[64]; + for (size_t i = 0 ; i < 64 ; ++i) { + CHECK_AND_ASSERT_MES(ge_frombytes_vartime(&P1_p3[i], P1[i].bytes) == 0, false, "point conv failed"); + CHECK_AND_ASSERT_MES(ge_frombytes_vartime(&P2_p3[i], P2[i].bytes) == 0, false, "point conv failed"); + } + return verifyBorromean(bb, P1_p3, P2_p3); + } + //Multilayered Spontaneous Anonymous Group Signatures (MLSAG signatures) //This is a just slghtly more efficient version than the ones described below //(will be explained in more detail in Ring Multisig paper @@ -336,16 +349,30 @@ namespace rct { try { PERF_TIMER(verRange); - key64 CiH; + ge_p3 CiH[64], asCi[64]; int i = 0; - key Ctmp = identity(); + ge_p3 Ctmp_p3 = ge_p3_identity; for (i = 0; i < 64; i++) { - subKeys(CiH[i], as.Ci[i], H2[i]); - addKeys(Ctmp, Ctmp, as.Ci[i]); + // faster equivalent of: + // subKeys(CiH[i], as.Ci[i], H2[i]); + // addKeys(Ctmp, Ctmp, as.Ci[i]); + ge_cached cached; + ge_p3 p3; + ge_p1p1 p1; + CHECK_AND_ASSERT_MES(ge_frombytes_vartime(&p3, H2[i].bytes) == 0, false, "point conv failed"); + ge_p3_to_cached(&cached, &p3); + CHECK_AND_ASSERT_MES(ge_frombytes_vartime(&asCi[i], as.Ci[i].bytes) == 0, false, "point conv failed"); + ge_sub(&p1, &asCi[i], &cached); + ge_p3_to_cached(&cached, &asCi[i]); + ge_p1p1_to_p3(&CiH[i], &p1); + ge_add(&p1, &Ctmp_p3, &cached); + ge_p1p1_to_p3(&Ctmp_p3, &p1); } + key Ctmp; + ge_p3_tobytes(Ctmp.bytes, &Ctmp_p3); if (!equalKeys(C, Ctmp)) return false; - if (!verifyBorromean(as.asig, as.Ci, CiH)) + if (!verifyBorromean(as.asig, asCi, CiH)) return false; return true; } |