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CLSAG device support

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This commit is contained in:
Sarang Noether 2020-03-27 15:29:32 -04:00 committed by moneromooo-monero
parent aff87b5f6a
commit 703944c4d4
5 changed files with 47 additions and 21 deletions
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4
src/device/device.hpp
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@ -231,6 +231,10 @@ namespace hw {
virtual bool mlsag_hash(const rct::keyV &long_message, rct::key &c) = 0;
virtual bool mlsag_sign(const rct::key &c, const rct::keyV &xx, const rct::keyV &alpha, const size_t rows, const size_t dsRows, rct::keyV &ss) = 0;
virtual bool clsag_prepare(const rct::key &p, const rct::key &z, rct::key &I, rct::key &D, const rct::key &H, rct::key &a, rct::key &aG, rct::key &aH) = 0;
virtual bool clsag_hash(const rct::keyV &data, rct::key &hash) = 0;
virtual bool clsag_sign(const rct::key &c, const rct::key &a, const rct::key &p, const rct::key &z, const rct::key &mu_P, const rct::key &mu_C, rct::key &s) = 0;
virtual bool close_tx(void) = 0;
virtual bool has_ki_cold_sync(void) const { return false; }

23
src/device/device_default.cpp
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@ -402,6 +402,29 @@ namespace hw {
return true;
}
bool device_default::clsag_prepare(const rct::key &p, const rct::key &z, rct::key &I, rct::key &D, const rct::key &H, rct::key &a, rct::key &aG, rct::key &aH) {
rct::skpkGen(a,aG); // aG = a*G
rct::scalarmultKey(aH,H,a); // aH = a*H
rct::scalarmultKey(I,H,p); // I = p*H
rct::scalarmultKey(D,H,z); // D = z*H
return true;
}
bool device_default::clsag_hash(const rct::keyV &data, rct::key &hash) {
hash = rct::hash_to_scalar(data);
return true;
}
bool device_default::clsag_sign(const rct::key &c, const rct::key &a, const rct::key &p, const rct::key &z, const rct::key &mu_P, const rct::key &mu_C, rct::key &s) {
rct::key s0_p_mu_P;
sc_mul(s0_p_mu_P.bytes,mu_P.bytes,p.bytes);
rct::key s0_add_z_mu_C;
sc_muladd(s0_add_z_mu_C.bytes,mu_C.bytes,z.bytes,s0_p_mu_P.bytes);
sc_mulsub(s.bytes,c.bytes,s0_add_z_mu_C.bytes,a.bytes);
return true;
}
bool device_default::close_tx() {
return true;
}

4
src/device/device_default.hpp
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@ -134,6 +134,10 @@ namespace hw {
bool mlsag_hash(const rct::keyV &long_message, rct::key &c) override;
bool mlsag_sign(const rct::key &c, const rct::keyV &xx, const rct::keyV &alpha, const size_t rows, const size_t dsRows, rct::keyV &ss) override;
bool clsag_prepare(const rct::key &p, const rct::key &z, rct::key &I, rct::key &D, const rct::key &H, rct::key &a, rct::key &aG, rct::key &aH) override;
bool clsag_hash(const rct::keyV &data, rct::key &hash) override;
bool clsag_sign(const rct::key &c, const rct::key &a, const rct::key &p, const rct::key &z, const rct::key &mu_P, const rct::key &mu_C, rct::key &s) override;
bool close_tx(void) override;
};

33
src/ringct/rctSigs.cpp
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@ -173,7 +173,7 @@ namespace rct {
// P[l] == p*G
// C[l] == z*G
// C[i] == C_nonzero[i] - C_offset (for hashing purposes) for all i
clsag CLSAG_Gen(const key &message, const keyV & P, const key & p, const keyV & C, const key & z, const keyV & C_nonzero, const key & C_offset, const unsigned int l, const multisig_kLRki *kLRki, key *mscout, key *mspout) {
clsag CLSAG_Gen(const key &message, const keyV & P, const key & p, const keyV & C, const key & z, const keyV & C_nonzero, const key & C_offset, const unsigned int l, const multisig_kLRki *kLRki, key *mscout, key *mspout, hw::device &hwdev) {
clsag sig;
size_t n = P.size(); // ring size
CHECK_AND_ASSERT_THROW_MES(n == C.size(), "Signing and commitment key vector sizes must match!");
@ -189,16 +189,21 @@ namespace rct {
ge_p3_tobytes(H.bytes,&H_p3);
key D;
scalarmultKey(D,H,z);
// Initial values
key a;
key aG;
key aH;
// Multisig
if (kLRki)
{
sig.I = kLRki->ki;
scalarmultKey(D,H,z);
}
else
{
scalarmultKey(sig.I,H,p);
hwdev.clsag_prepare(p,z,sig.I,D,H,a,aG,aH);
}
geDsmp I_precomp;
@ -209,13 +214,6 @@ namespace rct {
// Offset key image
scalarmultKey(sig.D,D,INV_EIGHT);
// Initial values
key a;
key aG;
key aH;
skpkGen(a,aG);
scalarmultKey(aH,H,a);
// Aggregation hashes
keyV mu_P_to_hash(2*n+4); // domain, I, D, P, C, C_offset
keyV mu_C_to_hash(2*n+4); // domain, I, D, P, C, C_offset
@ -266,7 +264,7 @@ namespace rct {
c_to_hash[2*n+3] = aG;
c_to_hash[2*n+4] = aH;
}
c = hash_to_scalar(c_to_hash);
hwdev.clsag_hash(c_to_hash,c);
size_t i;
i = (l + 1) % n;
@ -305,7 +303,7 @@ namespace rct {
c_to_hash[2*n+3] = L;
c_to_hash[2*n+4] = R;
c_new = hash_to_scalar(c_to_hash);
hwdev.clsag_hash(c_to_hash,c_new);
copy(c,c_new);
i = (i + 1) % n;
@ -314,11 +312,8 @@ namespace rct {
}
// Compute final scalar
key s0_p_mu_P;
sc_mul(s0_p_mu_P.bytes,mu_P.bytes,p.bytes);
key s0_add_z_mu_C;
sc_muladd(s0_add_z_mu_C.bytes,mu_C.bytes,z.bytes,s0_p_mu_P.bytes);
sc_mulsub(sig.s[l].bytes,c.bytes,s0_add_z_mu_C.bytes,a.bytes);
hwdev.clsag_sign(c,a,p,z,mu_P,mu_C,sig.s[l]);
memwipe(&a, sizeof(key));
if (mscout)
*mscout = c;
@ -329,7 +324,7 @@ namespace rct {
}
clsag CLSAG_Gen(const key &message, const keyV & P, const key & p, const keyV & C, const key & z, const keyV & C_nonzero, const key & C_offset, const unsigned int l) {
return CLSAG_Gen(message, P, p, C, z, C_nonzero, C_offset, l, NULL, NULL, NULL);
return CLSAG_Gen(message, P, p, C, z, C_nonzero, C_offset, l, NULL, NULL, NULL, hw::get_device("default"));
}
// MLSAG signatures
@ -748,7 +743,7 @@ namespace rct {
sk[0] = copy(inSk.dest);
sc_sub(sk[1].bytes, inSk.mask.bytes, a.bytes);
clsag result = CLSAG_Gen(message, P, sk[0], C, sk[1], C_nonzero, Cout, index, kLRki, mscout, mspout);
clsag result = CLSAG_Gen(message, P, sk[0], C, sk[1], C_nonzero, Cout, index, kLRki, mscout, mspout, hwdev);
memwipe(sk.data(), sk.size() * sizeof(key));
return result;
}

4
src/ringct/rctSigs.h
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@ -77,8 +77,8 @@ namespace rct {
mgSig MLSAG_Gen(const key &message, const keyM & pk, const keyV & xx, const multisig_kLRki *kLRki, key *mscout, const unsigned int index, size_t dsRows, hw::device &hwdev);
bool MLSAG_Ver(const key &message, const keyM &pk, const mgSig &sig, size_t dsRows);
clsag CLSAG_Gen(const key &message, const keyV & P, const key & p, const keyV & C, const keyV & C_nonzero, const key & C_offset, const key & z, const unsigned int l, const multisig_kLRki *kLRki, key *mscout, key *mspout);
clsag CLSAG_Gen(const key &message, const keyV & P, const key & p, const keyV & C, const keyV & C_nonzero, const key & C_offset, const key & z, const unsigned int l);
clsag CLSAG_Gen(const key &message, const keyV & P, const key & p, const keyV & C, const key & z, const keyV & C_nonzero, const key & C_offset, const unsigned int l, const multisig_kLRki *kLRki, key *mscout, key *mspout, hw::device &hwdev);
clsag CLSAG_Gen(const key &message, const keyV & P, const key & p, const keyV & C, const key & z, const keyV & C_nonzero, const key & C_offset, const unsigned int l);
clsag proveRctCLSAGSimple(const key &, const ctkeyV &, const ctkey &, const key &, const key &, const multisig_kLRki *, key *, key *, unsigned int, hw::device &);
bool verRctCLSAGSimple(const key &, const clsag &, const ctkeyV &, const key &);