diff options
| author | Sonic <sonic@dexon.org> | 2019-04-17 14:20:48 +0800 |
|---|---|---|
| committer | Sonic <sonic@dexon.org> | 2019-04-17 15:05:49 +0800 |
| commit | b43de7c695c2f7eb79359233e5d75b94fa4ba471 (patch) | |
| tree | ad087d0afcd6513f4dd537f081f1436317829860 | |
| parent | 65b1afd18c0bcb88db1b056e8b16120c9de827d4 (diff) | |
| download | dexon-mcl-b43de7c695c2f7eb79359233e5d75b94fa4ba471.tar.gz dexon-mcl-b43de7c695c2f7eb79359233e5d75b94fa4ba471.tar.zst dexon-mcl-b43de7c695c2f7eb79359233e5d75b94fa4ba471.zip | |
change hash function into Fp
| -rw-r--r-- | include/mcl/bn.hpp | 2 | ||||
| -rw-r--r-- | include/mcl/fp.hpp | 13 |
2 files changed, 14 insertions, 1 deletions
diff --git a/include/mcl/bn.hpp b/include/mcl/bn.hpp index 63ce484..d4ceec9 100644 --- a/include/mcl/bn.hpp +++ b/include/mcl/bn.hpp @@ -528,7 +528,7 @@ struct MapTo { // hash the concatenated msg into Fp Fp t; - t.setHashOf(m, bufSize+postfixSize); + t.setHashOfMod(m, bufSize+postfixSize); // TODO handle error bool b = calcBN<G1, Fp>(P, t); diff --git a/include/mcl/fp.hpp b/include/mcl/fp.hpp index 2e69729..cca0af9 100644 --- a/include/mcl/fp.hpp +++ b/include/mcl/fp.hpp @@ -368,6 +368,19 @@ public: uint32_t size = op_.hash(buf, static_cast<uint32_t>(sizeof(buf)), msg, static_cast<uint32_t>(msgSize)); setArrayMask(buf, size); } + void setHashOfMod(const void *msg, size_t msgSize) + { + char buf[MCL_MAX_HASH_BIT_SIZE / 8]; + uint32_t size = op_.hash(buf, static_cast<uint32_t>(sizeof(buf)), msg, static_cast<uint32_t>(msgSize)); + // big endian + for(uint32_t i = 0; i < size / 2; ++i) { + char c = buf[i]; + buf[i] = buf[size-i-1]; + buf[size-i-1] = c; + } + bool b; + setArray(&b, buf, size, fp::Mod); + } void getMpz(bool *pb, mpz_class& x) const { fp::Block b; |