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[Early DRAFT] Implement FROST and ChillDKG BIPs #2590

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[Early DRAFT] Implement FROST and ChillDKG BIPs #2590

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5605f0f
btcec/schnorr: don't check message length, add test vectors
aakselrod Mar 22, 2026
81f53ee
btcec/schnorr: allow non-bip340 tagged hash prefix
aakselrod Apr 12, 2026
51501cc
chilldkg: vss
aakselrod Jan 17, 2026
289f57a
chilldkg: simplpedpop
aakselrod Jan 21, 2026
f0a7e78
chilldkg: encpedpop
aakselrod Mar 30, 2026
b7fd384
chilldkg: certeq and top-level API
aakselrod Mar 28, 2026
afb2450
wip chilldkg vector tests
aakselrod Apr 12, 2026
8f051f1
wip frost signing
aakselrod Apr 12, 2026
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232 changes: 136 additions & 96 deletions btcec/schnorr/signature.go
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80 changes: 80 additions & 0 deletions btcec/schnorr/signature_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@ package schnorr
import (
"encoding/hex"
"errors"
"fmt"
"strings"
"testing"
"testing/quick"
Expand All @@ -16,6 +17,7 @@ import (
"github.com/davecgh/go-spew/spew"
secp_ecdsa "github.com/decred/dcrd/dcrec/secp256k1/v4"
ecdsa_schnorr "github.com/decred/dcrd/dcrec/secp256k1/v4/schnorr"
"github.com/stretchr/testify/require"
)

type bip340Test struct {
Expand Down Expand Up @@ -148,6 +150,42 @@ var bip340TestVectors = []bip340Test{
validPubKey: false,
expectErr: secp_ecdsa.ErrPubKeyXTooBig,
},
{
secretKey: "0340034003400340034003400340034003400340034003400340034003400340",
publicKey: "778CAA53B4393AC467774D09497A87224BF9FAB6F6E68B23086497324D6FD117",
auxRand: "0000000000000000000000000000000000000000000000000000000000000000",
message: "",
signature: "71535DB165ECD9FBBC046E5FFAEA61186BB6AD436732FCCC25291A55895464CF6069CE26BF03466228F19A3A62DB8A649F2D560FAC652827D1AF0574E427AB63",
verifyResult: true,
validPubKey: true,
},
{
secretKey: "0340034003400340034003400340034003400340034003400340034003400340",
publicKey: "778CAA53B4393AC467774D09497A87224BF9FAB6F6E68B23086497324D6FD117",
auxRand: "0000000000000000000000000000000000000000000000000000000000000000",
message: "11",
signature: "08A20A0AFEF64124649232E0693C583AB1B9934AE63B4C3511F3AE1134C6A303EA3173BFEA6683BD101FA5AA5DBC1996FE7CACFC5A577D33EC14564CEC2BACBF",
verifyResult: true,
validPubKey: true,
},
{
secretKey: "0340034003400340034003400340034003400340034003400340034003400340",
publicKey: "778CAA53B4393AC467774D09497A87224BF9FAB6F6E68B23086497324D6FD117",
auxRand: "0000000000000000000000000000000000000000000000000000000000000000",
message: "0102030405060708090A0B0C0D0E0F1011",
signature: "5130F39A4059B43BC7CAC09A19ECE52B5D8699D1A71E3C52DA9AFDB6B50AC370C4A482B77BF960F8681540E25B6771ECE1E5A37FD80E5A51897C5566A97EA5A5",
verifyResult: true,
validPubKey: true,
},
{
secretKey: "0340034003400340034003400340034003400340034003400340034003400340",
publicKey: "778CAA53B4393AC467774D09497A87224BF9FAB6F6E68B23086497324D6FD117",
auxRand: "0000000000000000000000000000000000000000000000000000000000000000",
message: "99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999",
signature: "403B12B0D8555A344175EA7EC746566303321E5DBFA8BE6F091635163ECA79A8585ED3E3170807E7C03B720FC54C7B23897FCBA0E9D0B4A06894CFD249F22367",
verifyResult: true,
validPubKey: true,
},
}

// decodeHex decodes the passed hex string and returns the resulting bytes. It
Expand Down Expand Up @@ -329,3 +367,45 @@ func TestParseSignatureComponentRange(t *testing.T) {
}
}
}

// TestSchnorrSignArbitraryLengthNoNonceCollision checks that different
// messages don't result in the same nonce when using RFC 6979 due to message
// truncation or padding during nonce generation.
func TestSchnorrSignArbitraryLengthNoNonceCollision(t *testing.T) {
t.Parallel()

testCases := []struct {
msg1 string
msg2 string
}{
{
msg1: strings.Repeat("ab", 40),
msg2: strings.Repeat("ab", 32),
},
{
msg1: strings.Repeat("cd", 32) + "01",
msg2: strings.Repeat("cd", 32) + "02",
},
{
msg1: "11",
msg2: strings.Repeat("00", 31) + "11",
},
}

privKey, err := btcec.NewPrivateKey()
require.NoError(t, err)

for i, tc := range testCases {
t.Run(fmt.Sprintf("%d", i+1), func(t *testing.T) {
msg1 := decodeHex(tc.msg1)
sig1, err := Sign(privKey, msg1)
require.NoError(t, err)

msg2 := decodeHex(tc.msg2)
sig2, err := Sign(privKey, msg2)
require.NoError(t, err)

require.NotEqual(t, sig1.r, sig2.r)
})
}
}
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