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Fixes to build on ubuntu 20.04 #14

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Fixes to build on ubuntu 20.04 #14

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8d19e7b
cherrry pick fixed files
n-hutton Jul 7, 2022
455fd72
schnorr fix
n-hutton Jul 13, 2022
8266ea0
add debug string
n-hutton Jul 13, 2022
b125d60
fix...
n-hutton Jul 13, 2022
7bc2dd5
tidy away cout
n-hutton Jul 15, 2022
0e6552f
tidying
n-hutton Jul 15, 2022
8a141e6
style
n-hutton Jul 15, 2022
27b7c8d
fix
n-hutton Jul 15, 2022
66b1ae3
style..
n-hutton Jul 15, 2022
8365020
revert bn fix but keep signature
Aug 11, 2022
6262444
split into only bn fix
Aug 11, 2022
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2 changes: 1 addition & 1 deletion src/libSchnorr/src/MultiSig.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -367,7 +367,7 @@ bool MultiSig::MultiSigVerify(const bytes& message, unsigned int offset,
return false;
}
err2 = (BN_nnmod(challenge_built.get(), challenge_built.get(),
Schnorr::GetCurveOrder(), NULL) == 0);
Schnorr::GetCurveOrder(), ctx.get()) == 0);
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@n-hutton n-hutton Jul 15, 2022

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This caused a SEGV when running ubuntu 20.04 - the API for bignum indicates that this argument should be provided. It is a scratch variable:

https://linux.die.net/man/3/bn_nnmod

For all functions, ctx is a previously allocated BN_CTX used for temporary variables;

err = err || err2;
if (err2) {
// Challenge rebuild mod failed
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8 changes: 7 additions & 1 deletion src/libSchnorr/src/MultiSig_Challenge.cpp
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Expand Up @@ -129,6 +129,11 @@ void Challenge::Set(const CommitPoint& aggregatedCommit,

bytes buf(Schnorr::PUBKEY_COMPRESSED_SIZE_BYTES);

unique_ptr<BN_CTX, void (*)(BN_CTX*)> ctx(BN_CTX_new(), BN_CTX_free);
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@n-hutton n-hutton Jul 15, 2022

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Allocate temporary ctx variable here

if (!ctx) {
throw std::bad_alloc();
}

// Convert the committment to octets first
if (EC_POINT_point2oct(Schnorr::GetCurveGroup(), aggregatedCommit.m_p.get(),
POINT_CONVERSION_COMPRESSED, buf.data(),
Expand Down Expand Up @@ -166,7 +171,8 @@ void Challenge::Set(const CommitPoint& aggregatedCommit,
return;
}

if (BN_nnmod(m_c.get(), m_c.get(), Schnorr::GetCurveOrder(), NULL) == 0) {
if (BN_nnmod(m_c.get(), m_c.get(), Schnorr::GetCurveOrder(), ctx.get()) ==
0) {
// Could not reduce challenge modulo group order
return;
}
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7 changes: 6 additions & 1 deletion src/libSchnorr/src/MultiSig_CommitPointHash.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -104,6 +104,10 @@ void CommitPointHash::Set(const CommitPoint& point) {
// byte to 0x01.
sha2.Update({SECOND_DOMAIN_SEPARATED_HASH_FUNCTION_BYTE});

unique_ptr<BN_CTX, void (*)(BN_CTX*)> ctx(BN_CTX_new(), BN_CTX_free);
if (!ctx) {
throw std::bad_alloc();
}
// Convert the commitment to octets first
if (EC_POINT_point2oct(Schnorr::GetCurveGroup(), point.m_p.get(),
POINT_CONVERSION_COMPRESSED, buf.data(),
Expand All @@ -123,7 +127,8 @@ void CommitPointHash::Set(const CommitPoint& point) {
return;
}

if (BN_nnmod(m_h.get(), m_h.get(), Schnorr::GetCurveOrder(), NULL) == 0) {
if (BN_nnmod(m_h.get(), m_h.get(), Schnorr::GetCurveOrder(), ctx.get()) ==
0) {
// Could not reduce hashpoint value modulo group order
return;
}
Expand Down