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module.cpp
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module.cpp
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#include "module.h"
#include <cryptofuzz/util.h>
#include <cryptofuzz/crypto.h>
#include <boost/multiprecision/cpp_int.hpp>
#include <sstream>
extern "C" {
#include <secp256k1.h>
#include <secp256k1_recovery.h>
#include <secp256k1_schnorrsig.h>
#include <secp256k1_ecdh.h>
#include "secp256k1_api.h"
}
namespace cryptofuzz {
namespace module {
secp256k1::secp256k1(void) :
Module("secp256k1") { }
namespace secp256k1_detail {
static int CheckRet(const int ret) {
CF_ASSERT(ret == 0 || ret == 1, "Unexpected return value");
return ret;
}
static bool EncodeBignum(const std::string s, uint8_t* out) {
std::vector<uint8_t> v;
boost::multiprecision::cpp_int c(s);
boost::multiprecision::export_bits(c, std::back_inserter(v), 8);
if ( v.size() > 32 ) {
return false;
}
const auto diff = 32 - v.size();
memset(out, 0, 32);
memcpy(out + diff, v.data(), v.size());
return true;
}
static std::string toString(const boost::multiprecision::cpp_int& i) {
std::stringstream ss;
ss << i;
if ( ss.str().empty() ) {
return "0";
} else {
return ss.str();
}
}
std::optional<component::ECC_PublicKey> To_ECC_PublicKey(const secp256k1_context* ctx, const secp256k1_pubkey* pubkey) {
std::optional<component::ECC_PublicKey> ret = std::nullopt;
std::vector<uint8_t> pubkey_bytes(65);
size_t pubkey_bytes_size = pubkey_bytes.size();
CF_CHECK_EQ(
CheckRet(secp256k1_ec_pubkey_serialize(ctx, pubkey_bytes.data(), &pubkey_bytes_size, pubkey, SECP256K1_FLAGS_TYPE_COMPRESSION)), 1);
CF_CHECK_EQ(pubkey_bytes_size, 65);
{
boost::multiprecision::cpp_int x, y;
boost::multiprecision::import_bits(x, pubkey_bytes.begin() + 1, pubkey_bytes.begin() + 1 + 32);
boost::multiprecision::import_bits(y, pubkey_bytes.begin() + 1 + 32, pubkey_bytes.end());
ret = {secp256k1_detail::toString(x), secp256k1_detail::toString(y)};
}
end:
return ret;
}
bool PrivkeyToBytes(const component::ECC_PrivateKey& priv, uint8_t privkey_bytes[32]) {
bool ret = false;
CF_CHECK_EQ(secp256k1_detail::EncodeBignum(
priv.ToTrimmedString(),
privkey_bytes), true);
ret = true;
end:
return ret;
}
bool PubkeyToBytes(const component::ECC_PublicKey& pub, uint8_t pubkey_bytes[65]) {
bool ret = false;
pubkey_bytes[0] = 4;
CF_CHECK_EQ(secp256k1_detail::EncodeBignum(
pub.first.ToTrimmedString(),
pubkey_bytes + 1), true);
CF_CHECK_EQ(secp256k1_detail::EncodeBignum(
pub.second.ToTrimmedString(),
pubkey_bytes + 1 + 32), true);
ret = true;
end:
return ret;
}
template <class T>
void AssertZero(const T* v) {
const static T nulls = {0};
CF_ASSERT(memcmp(v, &nulls, sizeof(T)) == 0, "Variable is not all zeroes");
}
class Context {
private:
Datasource& ds;
secp256k1_context* ctx = nullptr;
void randomizeContext(void) {
std::vector<uint8_t> seed;
try {
if ( ds.Get<bool>() ) {
seed = ds.GetData(0, 32, 32);
CF_ASSERT(
CheckRet(secp256k1_context_randomize(ctx, seed.data())) == 1,
"Call to secp256k1_context_randomize failed");
}
} catch ( fuzzing::datasource::Datasource::OutOfData ) { }
}
void clone(void) {
const auto newCtx = secp256k1_context_clone(ctx);
CF_ASSERT(newCtx != nullptr, "secp256k1_context_clone failed");
CF_NORET(secp256k1_context_destroy(ctx));
ctx = newCtx;
}
public:
Context(Datasource& ds, const unsigned int flags) :
ds(ds) {
CF_ASSERT((ctx = secp256k1_context_create(flags)) != nullptr, "Cannot create secp256k1 context");
}
~Context(void) {
GetPtr();
CF_NORET(secp256k1_context_destroy(ctx));
ctx = nullptr;
}
secp256k1_context* GetPtr(void) {
try {
if ( ds.Get<bool>() ) {
randomizeContext();
}
if ( ds.Get<bool>() ) {
clone();
}
} catch ( fuzzing::datasource::Datasource::OutOfData ) { }
return ctx;
}
secp256k1_context* GetPtrDirect(void) {
return ctx;
}
};
class ECDSA_Recoverable_Signature {
private:
Datasource& ds;
Context& ctx;
bool initialized = false;
secp256k1_ecdsa_recoverable_signature* sig = nullptr;
void serializeCompact(void) {
uint8_t data[64];
int id;
if ( CheckRet(secp256k1_ecdsa_recoverable_signature_serialize_compact(
ctx.GetPtr(),
data,
&id,
sig)) == 1 ) {
CF_ASSERT(
CheckRet(secp256k1_ecdsa_recoverable_signature_parse_compact(
ctx.GetPtr(),
sig,
data,
id)) == 1,
"Cannot deserialize compact recoverable signature");
}
}
void convert(void) {
secp256k1_ecdsa_signature sig_;
CheckRet(secp256k1_ecdsa_recoverable_signature_convert(ctx.GetPtr(), &sig_, sig));
}
public:
ECDSA_Recoverable_Signature(Datasource& ds, Context& ctx) :
ds(ds), ctx(ctx) {
sig = static_cast<secp256k1_ecdsa_recoverable_signature*>(malloc(sizeof(secp256k1_ecdsa_recoverable_signature)));
}
~ECDSA_Recoverable_Signature(void) {
GetPtr();
free(sig);
sig = nullptr;
}
void SetInitialized(void) {
initialized = true;
}
secp256k1_ecdsa_recoverable_signature* GetPtr() {
if ( initialized == true ) {
try {
if ( ds.Get<bool>() ) {
serializeCompact();
}
if ( ds.Get<bool>() ) {
convert();
}
} catch ( fuzzing::datasource::Datasource::OutOfData ) { }
}
return sig;
}
secp256k1_ecdsa_recoverable_signature* GetPtrDirect(void) const {
return sig;
}
bool ParseCompact(const uint8_t* data, const uint8_t id) {
const auto ctxPtr = ctx.GetPtrDirect();
const auto sigPtr = GetPtr();
const bool ret = CheckRet(secp256k1_ecdsa_recoverable_signature_parse_compact(ctxPtr, sigPtr, data, id)) == 1;
if ( ret ) {
SetInitialized();
} else {
/* https://github.com/bitcoin-core/secp256k1/blob/8ae56e33e749e16880dbfb4444fdae238b4426ac/src/modules/recovery/main_impl.h#L55 */
secp256k1_detail::AssertZero<>(sigPtr);
}
return ret;
}
};
class Pubkey {
private:
Datasource& ds;
Context& ctx;
bool initialized = false;
secp256k1_pubkey* pub = nullptr;
void serialize(void) {
uint8_t* data = nullptr;
size_t original_size = 0;
try {
original_size = ds.Get<uint16_t>();
size_t size = original_size;
data = util::malloc(size);
if ( data != nullptr ) {
unsigned int flags = SECP256K1_FLAGS_TYPE_COMPRESSION;
if ( ds.Get<bool>() ) {
flags |= SECP256K1_FLAGS_BIT_COMPRESSION;
}
bool validOutsize;
if ( flags & SECP256K1_FLAGS_BIT_COMPRESSION ) {
validOutsize = size >= 33;
} else {
validOutsize = size >= 65;
}
if ( validOutsize ) {
if (
CheckRet(secp256k1_ec_pubkey_serialize(
ctx.GetPtr(),
data,
&size,
pub,
flags)) == 1 ) {
CF_ASSERT(
CheckRet(secp256k1_ec_pubkey_parse(
ctx.GetPtr(),
pub,
data,
size)) == 1,
"Cannot deserialize pubkey");
}
}
}
} catch ( fuzzing::datasource::Datasource::OutOfData ) { }
if ( original_size > 0 ) {
util::free(data);
}
}
public:
Pubkey(Datasource& ds, Context& ctx) :
ds(ds), ctx(ctx) {
pub = static_cast<secp256k1_pubkey*>(malloc(sizeof(secp256k1_pubkey)));
}
~Pubkey(void) {
GetPtr();
free(pub);
pub = nullptr;
}
void SetInitialized(void) {
initialized = true;
}
secp256k1_pubkey* GetPtr() {
return pub;
if ( initialized == true ) {
try {
if ( ds.Get<bool>() ) {
serialize();
}
} catch ( fuzzing::datasource::Datasource::OutOfData ) { }
}
return pub;
}
bool Create(const uint8_t key[32]) {
const auto ctxPtr = ctx.GetPtrDirect();
const auto pubPtr = GetPtr();
const bool ret = CheckRet(secp256k1_ec_pubkey_create(ctxPtr, pubPtr, key)) == 1;
if ( ret ) {
SetInitialized();
}
return ret;
}
bool Serialize(uint8_t* data, size_t* size) {
const auto ctxPtr = ctx.GetPtrDirect();
const auto pubPtr = GetPtr();
const bool ret = CheckRet(secp256k1_ec_pubkey_serialize(ctxPtr, data, size, pubPtr, SECP256K1_FLAGS_TYPE_COMPRESSION)) == 1;
if ( ret ) {
CF_ASSERT(*size == 65, "Serialized pubkey is not 65 bytes");
}
return ret;
}
bool Parse(const uint8_t* data, size_t size) {
const auto ctxPtr = ctx.GetPtrDirect();
const auto pubPtr = GetPtr();
const bool ret = CheckRet(secp256k1_ec_pubkey_parse(ctxPtr, pubPtr, data, size)) == 1;
if ( ret ) {
SetInitialized();
}
return ret;
}
bool ECDH(uint8_t out[32], const uint8_t key[32]) {
const auto ctxPtr = ctx.GetPtrDirect();
const auto pubPtr = GetPtr();
return CheckRet(secp256k1_ecdh(ctxPtr, out, pubPtr, key, nullptr, nullptr)) == 1;
}
bool Recover(ECDSA_Recoverable_Signature& sig, const uint8_t hash[32]) {
const auto ctxPtr = ctx.GetPtrDirect();
const auto sigPtr = sig.GetPtrDirect();
const auto pubPtr = GetPtr();
const bool ret = CheckRet(secp256k1_ecdsa_recover(ctxPtr, pubPtr, sigPtr, hash)) == 1;
if ( ret == true ) {
SetInitialized();
} else {
/* https://github.com/bitcoin-core/secp256k1/blob/8ae56e33e749e16880dbfb4444fdae238b4426ac/src/modules/recovery/main_impl.h#L155 */
AssertZero<>(pubPtr);
}
return ret;
}
secp256k1_pubkey* GetPtrDirect(void) const {
return pub;
}
};
class ECDSA_Signature {
private:
Datasource& ds;
Context& ctx;
bool initialized = false;
secp256k1_ecdsa_signature* sig = nullptr;
void serializeDER(void) {
const size_t original_size = ds.Get<uint16_t>();
size_t size = original_size;
uint8_t* data = util::malloc(size);
if ( data != nullptr ) {
if ( CheckRet(secp256k1_ecdsa_signature_serialize_der(
ctx.GetPtr(),
data,
&size,
sig)) == 1 ) {
CF_ASSERT(
CheckRet(secp256k1_ecdsa_signature_parse_der(
ctx.GetPtr(),
sig,
data,
size)) == 1,
"Cannot deserialize DER signature");
}
}
if ( original_size > 0 ) {
util::free(data);
}
}
void serializeCompact(void) {
uint8_t data[64];
if ( CheckRet(secp256k1_ecdsa_signature_serialize_compact(
ctx.GetPtr(),
data,
sig)) == 1 ) {
CF_ASSERT(
CheckRet(secp256k1_ecdsa_signature_parse_compact(
ctx.GetPtr(),
sig,
data)) == 1,
"Cannot deserialize compact signature");
}
}
public:
ECDSA_Signature(Datasource& ds, Context& ctx) :
ds(ds), ctx(ctx) {
sig = static_cast<secp256k1_ecdsa_signature*>(malloc(sizeof(secp256k1_ecdsa_signature)));
}
~ECDSA_Signature(void) {
GetPtr();
free(sig);
sig = nullptr;
}
void SetInitialized(void) {
initialized = true;
}
secp256k1_ecdsa_signature* GetPtr() {
if ( initialized == true ) {
try {
if ( ds.Get<bool>() ) {
serializeDER();
}
if ( ds.Get<bool>() ) {
serializeCompact();
}
} catch ( fuzzing::datasource::Datasource::OutOfData ) { }
}
return sig;
}
bool ParseCompact(const uint8_t* data) {
const auto ctxPtr = ctx.GetPtrDirect();
const auto sigPtr = GetPtr();
const bool ret = CheckRet(secp256k1_ecdsa_signature_parse_compact(ctxPtr, sigPtr, data)) == 1;
if ( ret ) {
SetInitialized();
}
return ret;
}
void Normalize(void) {
const auto ctxPtr = ctx.GetPtrDirect();
const auto sigPtr = GetPtr();
/* ignore ret */ CheckRet(secp256k1_ecdsa_signature_normalize(ctxPtr, sigPtr, sigPtr));
}
bool Verify(const uint8_t hash[32], Pubkey& pub) {
const auto sigPtr = GetPtr();
const auto ctxPtr = ctx.GetPtrDirect();
const auto pubPtr = pub.GetPtrDirect();
return CheckRet(secp256k1_ecdsa_verify(ctxPtr, sigPtr, hash, pubPtr)) == 1;
}
};
std::optional<component::ECC_PublicKey> OpECC_PrivateToPublic(Datasource& ds, const std::string priv) {
std::optional<component::ECC_PublicKey> ret = std::nullopt;
secp256k1_detail::Context ctx(ds, SECP256K1_CONTEXT_SIGN);
secp256k1_detail::Pubkey pub(ds, ctx);
std::vector<uint8_t> pubkey_bytes(65);
uint8_t key[32];
CF_CHECK_EQ(secp256k1_detail::EncodeBignum(
priv,
key), true);
CF_CHECK_TRUE(pub.Create(key));
{
const auto ctxPtr = ctx.GetPtrDirect();
const auto pubPtr = pub.GetPtr();
ret = To_ECC_PublicKey(ctxPtr, pubPtr);
}
end:
return ret;
}
static int nonce_function(unsigned char *nonce32, const unsigned char *msg32, const unsigned char *key32, const unsigned char *algo16, void *data, unsigned int counter) {
(void)nonce32;
(void)msg32;
(void)key32;
(void)algo16;
(void)counter;
memcpy(nonce32, data, 32);
return counter == 0;
}
static int nonce_function_schnorrsig(
unsigned char *nonce32,
const unsigned char *msg,
size_t msglen,
const unsigned char *key32,
const unsigned char *xonly_pk32,
const unsigned char *algo,
size_t algolen,
void *data) {
(void)nonce32;
(void)msg;
(void)msglen;
(void)key32;
(void)xonly_pk32;
(void)algo;
(void)algolen;
memcpy(nonce32, data, 32);
return 1;
}
}
std::optional<component::ECC_PublicKey> secp256k1::OpECC_PrivateToPublic(operation::ECC_PrivateToPublic& op) {
std::optional<component::ECC_PublicKey> ret = std::nullopt;
Datasource ds(op.modifier.GetPtr(), op.modifier.GetSize());
util::SetGlobalDs(&ds);
CF_CHECK_EQ(op.curveType.Get(), CF_ECC_CURVE("secp256k1"));
ret = secp256k1_detail::OpECC_PrivateToPublic(ds, op.priv.ToTrimmedString());
end:
util::UnsetGlobalDs();
return ret;
}
std::optional<bool> secp256k1::OpECC_ValidatePubkey(operation::ECC_ValidatePubkey& op) {
std::optional<bool> ret = std::nullopt;
Datasource ds(op.modifier.GetPtr(), op.modifier.GetSize());
util::SetGlobalDs(&ds);
secp256k1_detail::Context ctx(ds, SECP256K1_CONTEXT_VERIFY);
secp256k1_detail::Pubkey pub(ds, ctx);
uint8_t pubkey_bytes[65];
pubkey_bytes[0] = 4;
CF_CHECK_EQ(op.curveType.Get(), CF_ECC_CURVE("secp256k1"));
CF_CHECK_EQ(secp256k1_detail::EncodeBignum(
op.pub.first.ToTrimmedString(),
pubkey_bytes + 1), true);
CF_CHECK_EQ(secp256k1_detail::EncodeBignum(
op.pub.second.ToTrimmedString(),
pubkey_bytes + 1 + 32), true);
ret = pub.Parse(pubkey_bytes, sizeof(pubkey_bytes));
end:
util::UnsetGlobalDs();
return ret;
}
std::optional<component::ECDSA_Signature> secp256k1::OpECDSA_Sign(operation::ECDSA_Sign& op) {
std::optional<component::ECDSA_Signature> ret = std::nullopt;
Datasource ds(op.modifier.GetPtr(), op.modifier.GetSize());
util::SetGlobalDs(&ds);
secp256k1_detail::Context ctx(ds, SECP256K1_CONTEXT_SIGN);
secp256k1_detail::Pubkey pub(ds, ctx);
secp256k1_detail::ECDSA_Signature sig(ds, ctx);
std::vector<uint8_t> sig_bytes(64);
std::vector<uint8_t> pubkey_bytes(65);
size_t pubkey_bytes_size = pubkey_bytes.size();
uint8_t key[32];
uint8_t hash[32];
uint8_t specified_nonce[32];
CF_CHECK_TRUE(op.UseRFC6979Nonce() || op.UseSpecifiedNonce());
CF_CHECK_EQ(op.curveType.Get(), CF_ECC_CURVE("secp256k1"));
CF_CHECK_EQ(secp256k1_detail::EncodeBignum(
op.priv.ToTrimmedString(),
key), true);
if ( op.digestType.Get() == CF_DIGEST("NULL") ) {
const auto CT = op.cleartext.ECDSA_Pad(32);
memcpy(hash, CT.GetPtr(), sizeof(hash));
} else if ( op.digestType.Get() == CF_DIGEST("SHA256") ) {
const auto _hash = crypto::sha256(op.cleartext.Get());
memcpy(hash, _hash.data(), _hash.size());
} else {
goto end;
}
if ( op.UseRFC6979Nonce() == true ) {
CF_CHECK_EQ(secp256k1_ecdsa_sign(ctx.GetPtr(), sig.GetPtr(), hash, key, secp256k1_nonce_function_rfc6979, nullptr), 1);
sig.SetInitialized();
} else if ( op.UseSpecifiedNonce() == true ) {
CF_CHECK_EQ(secp256k1_detail::EncodeBignum(
op.nonce.ToTrimmedString(),
specified_nonce), true);
CF_CHECK_EQ(secp256k1_ecdsa_sign(ctx.GetPtr(), sig.GetPtr(), hash, key, secp256k1_detail::nonce_function, specified_nonce), 1);
sig.SetInitialized();
} else {
CF_UNREACHABLE();
}
CF_CHECK_EQ(secp256k1_ecdsa_signature_serialize_compact(ctx.GetPtr(), sig_bytes.data(), sig.GetPtr()), 1);
CF_CHECK_TRUE(pub.Create(key));
CF_CHECK_TRUE(pub.Serialize(pubkey_bytes.data(), &pubkey_bytes_size));
{
boost::multiprecision::cpp_int r, s;
auto component_pubkey = secp256k1_detail::OpECC_PrivateToPublic(ds, op.priv.ToTrimmedString());
CF_CHECK_NE(component_pubkey, std::nullopt);
boost::multiprecision::import_bits(r, sig_bytes.begin(), sig_bytes.begin() + 32);
boost::multiprecision::import_bits(s, sig_bytes.begin() + 32, sig_bytes.end());
ret = component::ECDSA_Signature(
{secp256k1_detail::toString(r), secp256k1_detail::toString(s)},
*component_pubkey);
}
end:
util::UnsetGlobalDs();
return ret;
}
std::optional<bool> secp256k1::OpECDSA_Verify(operation::ECDSA_Verify& op) {
std::optional<bool> ret = std::nullopt;
Datasource ds(op.modifier.GetPtr(), op.modifier.GetSize());
util::SetGlobalDs(&ds);
secp256k1_detail::Context ctx(ds, SECP256K1_CONTEXT_VERIFY);
secp256k1_detail::Pubkey pub(ds, ctx);
secp256k1_detail::ECDSA_Signature sig(ds, ctx);
uint8_t pubkey_bytes[65];
uint8_t sig_bytes[64];
uint8_t hash[32];
CF_CHECK_EQ(op.curveType.Get(), CF_ECC_CURVE("secp256k1"));
if ( op.digestType.Get() == CF_DIGEST("NULL") ) {
const auto CT = op.cleartext.ECDSA_Pad(32);
memcpy(hash, CT.GetPtr(), sizeof(hash));
} else if ( op.digestType.Get() == CF_DIGEST("SHA256") ) {
const auto _hash = crypto::sha256(op.cleartext.Get());
memcpy(hash, _hash.data(), _hash.size());
} else {
goto end;
}
/* Beyond this point, a failure definitely means that the
* pubkey or signature is invalid */
ret = false;
pubkey_bytes[0] = 4;
CF_CHECK_EQ(secp256k1_detail::EncodeBignum(
op.signature.pub.first.ToTrimmedString(),
pubkey_bytes + 1), true);
CF_CHECK_EQ(secp256k1_detail::EncodeBignum(
op.signature.pub.second.ToTrimmedString(),
pubkey_bytes + 1 + 32), true);
CF_CHECK_EQ(secp256k1_detail::EncodeBignum(
op.signature.signature.first.ToTrimmedString(),
sig_bytes), true);
CF_CHECK_EQ(secp256k1_detail::EncodeBignum(
op.signature.signature.second.ToTrimmedString(),
sig_bytes + 32), true);
CF_CHECK_TRUE(pub.Parse(pubkey_bytes, sizeof(pubkey_bytes)));
CF_CHECK_TRUE(sig.ParseCompact(sig_bytes));
sig.Normalize();
ret = sig.Verify(hash, pub);
end:
util::UnsetGlobalDs();
return ret;
}
std::optional<component::ECC_PublicKey> secp256k1::OpECDSA_Recover(operation::ECDSA_Recover& op) {
std::optional<component::ECC_PublicKey> ret = std::nullopt;
Datasource ds(op.modifier.GetPtr(), op.modifier.GetSize());
util::SetGlobalDs(&ds);
secp256k1_detail::Context ctx(ds, SECP256K1_CONTEXT_VERIFY);
secp256k1_detail::Pubkey pub(ds, ctx);
secp256k1_detail::ECDSA_Recoverable_Signature sig(ds, ctx);
uint8_t sig_bytes[64];
uint8_t hash[32];
std::vector<uint8_t> pubkey_bytes(65);
size_t pubkey_bytes_size = pubkey_bytes.size();
CF_CHECK_EQ(op.curveType.Get(), CF_ECC_CURVE("secp256k1"));
CF_CHECK_LTE(op.id, 3);
if ( op.digestType.Get() == CF_DIGEST("NULL") ) {
const auto CT = op.cleartext.ECDSA_Pad(32);
memcpy(hash, CT.GetPtr(), sizeof(hash));
} else if ( op.digestType.Get() == CF_DIGEST("SHA256") ) {
const auto _hash = crypto::sha256(op.cleartext.Get());
memcpy(hash, _hash.data(), _hash.size());
} else {
goto end;
}
CF_CHECK_EQ(secp256k1_detail::EncodeBignum(
op.signature.first.ToTrimmedString(),
sig_bytes), true);
CF_CHECK_EQ(secp256k1_detail::EncodeBignum(
op.signature.second.ToTrimmedString(),
sig_bytes + 32), true);
CF_CHECK_TRUE(sig.ParseCompact(sig_bytes, op.id));
CF_CHECK_TRUE(pub.Recover(sig, hash));
CF_CHECK_TRUE(pub.Serialize(pubkey_bytes.data(), &pubkey_bytes_size));
{
boost::multiprecision::cpp_int x, y;
boost::multiprecision::import_bits(x, pubkey_bytes.begin() + 1, pubkey_bytes.begin() + 33);
boost::multiprecision::import_bits(y, pubkey_bytes.begin() + 33, pubkey_bytes.end());
ret = component::ECC_PublicKey(secp256k1_detail::toString(x), secp256k1_detail::toString(y));
}
end:
util::UnsetGlobalDs();
return ret;
}
std::optional<component::Schnorr_Signature> secp256k1::OpSchnorr_Sign(operation::Schnorr_Sign& op) {
std::optional<component::Schnorr_Signature> ret = std::nullopt;
Datasource ds(op.modifier.GetPtr(), op.modifier.GetSize());
util::SetGlobalDs(&ds);
secp256k1_detail::Context ctx(ds, SECP256K1_CONTEXT_SIGN);
secp256k1_xonly_pubkey pubkey;
std::vector<uint8_t> sig_bytes(64);
std::vector<uint8_t> pubkey_bytes(32);
secp256k1_keypair keypair;
uint8_t key[32];
Buffer input;
uint8_t specified_nonce[32];
secp256k1_schnorrsig_extraparams extraparams;
CF_CHECK_TRUE(op.UseBIP340Nonce() || op.UseSpecifiedNonce() );
CF_CHECK_EQ(op.curveType.Get(), CF_ECC_CURVE("secp256k1"));
CF_CHECK_EQ(secp256k1_detail::EncodeBignum(
op.priv.ToTrimmedString(),
key), true);
CF_CHECK_EQ(secp256k1_keypair_create(ctx.GetPtr(), &keypair, key), 1);
if ( op.digestType.Get() == CF_DIGEST("NULL") ) {
input = op.cleartext;
} else if ( op.digestType.Get() == CF_DIGEST("SHA256") ) {
input = op.cleartext.SHA256();
} else {
goto end;
}
if ( op.UseBIP340Nonce() == true ) {
extraparams.noncefp = secp256k1_nonce_function_bip340;
extraparams.ndata = nullptr;
} else if ( op.UseSpecifiedNonce() == true ) {
CF_CHECK_EQ(secp256k1_detail::EncodeBignum(
op.nonce.ToTrimmedString(),
specified_nonce), true);
extraparams.noncefp = secp256k1_detail::nonce_function_schnorrsig;
extraparams.ndata = specified_nonce;
} else {
CF_UNREACHABLE();
}
/* Manually set magic until this is fixed:
* https://github.com/bitcoin-core/secp256k1/issues/962
*/
extraparams.magic[0] = 0xDA;
extraparams.magic[1] = 0x6F;
extraparams.magic[2] = 0xB3;
extraparams.magic[3] = 0x8C;
CF_CHECK_EQ(
secp256k1_detail::CheckRet(
secp256k1_schnorrsig_sign_custom(ctx.GetPtr(), sig_bytes.data(), input.GetPtr(), input.GetSize(), &keypair, &extraparams)
), 1);
CF_CHECK_EQ(secp256k1_keypair_xonly_pub(ctx.GetPtr(), &pubkey, nullptr, &keypair), 1);
CF_CHECK_EQ(secp256k1_xonly_pubkey_serialize(ctx.GetPtr(), pubkey_bytes.data(), &pubkey), 1);
{
boost::multiprecision::cpp_int x, r, s;
boost::multiprecision::import_bits(x, pubkey_bytes.begin(), pubkey_bytes.end());
boost::multiprecision::import_bits(r, sig_bytes.begin(), sig_bytes.begin() + 32);
boost::multiprecision::import_bits(s, sig_bytes.begin() + 32, sig_bytes.end());
ret = component::Schnorr_Signature(
{secp256k1_detail::toString(r), secp256k1_detail::toString(s)},
{secp256k1_detail::toString(x), "0"});
}
end:
util::UnsetGlobalDs();
return ret;
}
std::optional<bool> secp256k1::OpSchnorr_Verify(operation::Schnorr_Verify& op) {
std::optional<bool> ret = std::nullopt;
Datasource ds(op.modifier.GetPtr(), op.modifier.GetSize());
util::SetGlobalDs(&ds);
secp256k1_detail::Context ctx(ds, SECP256K1_CONTEXT_VERIFY);
secp256k1_xonly_pubkey pubkey;
uint8_t pubkey_bytes[32];
uint8_t sig_bytes[64];
Buffer input;
CF_CHECK_EQ(op.curveType.Get(), CF_ECC_CURVE("secp256k1"));
if ( op.digestType.Get() == CF_DIGEST("NULL") ) {
input = op.cleartext;
} else if ( op.digestType.Get() == CF_DIGEST("SHA256") ) {
input = op.cleartext.SHA256();
} else {
goto end;
}
/* Beyond this point, a failure definitely means that the
* pubkey or signature is invalid */
ret = false;
CF_CHECK_EQ(secp256k1_detail::EncodeBignum(
op.signature.pub.first.ToTrimmedString(),
pubkey_bytes), true);
CF_CHECK_EQ(secp256k1_detail::EncodeBignum(
op.signature.signature.first.ToTrimmedString(),
sig_bytes), true);
CF_CHECK_EQ(secp256k1_detail::EncodeBignum(
op.signature.signature.second.ToTrimmedString(),
sig_bytes + 32), true);
CF_CHECK_EQ(secp256k1_xonly_pubkey_parse(ctx.GetPtr(), &pubkey, pubkey_bytes), 1);
ret = secp256k1_detail::CheckRet(
secp256k1_schnorrsig_verify(ctx.GetPtr(), sig_bytes, input.GetPtr(), input.GetSize(), &pubkey)
) == 1 ? true : false;
end:
util::UnsetGlobalDs();
return ret;
}
std::optional<component::Secret> secp256k1::OpECDH_Derive(operation::ECDH_Derive& op) {
std::optional<component::Secret> ret = std::nullopt;
Datasource ds(op.modifier.GetPtr(), op.modifier.GetSize());
util::SetGlobalDs(&ds);
secp256k1_detail::Context ctx(ds, SECP256K1_CONTEXT_SIGN);
secp256k1_detail::Pubkey pub(ds, ctx);
uint8_t privkey_bytes[32];
uint8_t pubkey_bytes[65];
uint8_t out[32];
CF_CHECK_EQ(op.curveType.Get(), CF_ECC_CURVE("secp256k1"));
memset(out, 0, 32);
CF_CHECK_TRUE(secp256k1_detail::PrivkeyToBytes(op.priv, privkey_bytes));
CF_CHECK_TRUE(secp256k1_detail::PubkeyToBytes(op.pub, pubkey_bytes));
CF_CHECK_TRUE(pub.Parse(pubkey_bytes, sizeof(pubkey_bytes)));
CF_CHECK_TRUE(pub.ECDH(out, privkey_bytes));
ret = component::Secret(Buffer(out, sizeof(out)));
end:
util::UnsetGlobalDs();
return ret;
}
namespace secp256k1_detail {
bool ToScalar(void* scalar, const component::Bignum& bn) {
bool ret = false;
std::optional<std::vector<uint8_t>> bin;
int overflow;
CF_CHECK_NE(bin = util::DecToBin(bn.ToTrimmedString(), 32), std::nullopt);
CF_NORET(cryptofuzz_secp256k1_scalar_set_b32(scalar, bin->data(), &overflow));
CF_CHECK_EQ(overflow, 0);
ret = true;
end:
return ret;
}
bool ToFe(void* fe, const component::Bignum& bn) {
bool ret = false;
std::optional<std::vector<uint8_t>> bin;
CF_CHECK_NE(bin = util::DecToBin(bn.ToTrimmedString(), 32), std::nullopt);
CF_CHECK_EQ(cryptofuzz_secp256k1_fe_set_b32(fe, bin->data()), 1);
ret = true;
end:
return ret;
}
std::optional<component::Bignum> ToComponentBignum_scalar(const void* scalar) {
std::optional<component::Bignum> ret = std::nullopt;
uint8_t scalar_bytes[32];
CF_NORET(cryptofuzz_secp256k1_scalar_get_b32(scalar_bytes, scalar));
ret = component::Bignum(util::BinToDec(scalar_bytes, sizeof(scalar_bytes)));
return ret;
}
std::optional<component::Bignum> ToComponentBignum_fe(fuzzing::datasource::Datasource& ds, void* fe) {
std::optional<component::Bignum> ret = std::nullopt;
uint8_t fe_bytes[32];
bool var = false;
try { var = ds.Get<bool>(); } catch ( ... ) { }
CF_NORET(cryptofuzz_secp256k1_fe_get_b32(fe_bytes, fe, var ? 1 : 0));
ret = component::Bignum(util::BinToDec(fe_bytes, sizeof(fe_bytes)));
return ret;
}
}
std::optional<component::ECC_Point> secp256k1::OpECC_Point_Add(operation::ECC_Point_Add& op) {
std::optional<component::ECC_Point> ret = std::nullopt;
if ( !op.curveType.Is(CF_ECC_CURVE("secp256k1")) ) {
return ret;
}
Datasource ds(op.modifier.GetPtr(), op.modifier.GetSize());
void* a_ge = util::malloc(cryptofuzz_secp256k1_ge_size());
void* b_ge = util::malloc(cryptofuzz_secp256k1_ge_size());
void* res_ge = util::malloc(cryptofuzz_secp256k1_ge_size());
void* a_gej = util::malloc(cryptofuzz_secp256k1_gej_size());