62 lines
1.6 KiB
Go
62 lines
1.6 KiB
Go
package bls
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import (
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"crypto/rand"
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"fmt"
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"github.com/filecoin-project/go-address"
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"github.com/filecoin-project/specs-actors/actors/crypto"
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blst "github.com/supranational/blst/bindings/go"
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"github.com/filecoin-project/lotus/lib/sigs"
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)
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const DST = string("BLS_SIG_BLS12381G2_XMD:SHA-256_SSWU_RO_NUL_")
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type SecretKey = blst.SecretKey
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type PublicKey = blst.P1Affine
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type Signature = blst.P2Affine
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type AggregateSignature = blst.P2Aggregate
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type blsSigner struct{}
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func (blsSigner) GenPrivate() ([]byte, error) {
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// Generate 32 bytes of randomness
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var ikm [32]byte
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_, err := rand.Read(ikm[:])
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if err != nil {
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return nil, fmt.Errorf("bls signature error generating random data")
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}
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// Note private keys seem to be serialized little-endian!
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pk := blst.KeyGen(ikm[:]).ToLEndian()
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return pk, nil
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}
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func (blsSigner) ToPublic(priv []byte) ([]byte, error) {
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pk := new(SecretKey).FromLEndian(priv)
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if pk == nil || !pk.Valid() {
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return nil, fmt.Errorf("bls signature invalid private key")
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}
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return new(PublicKey).From(pk).Compress(), nil
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}
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func (blsSigner) Sign(p []byte, msg []byte) ([]byte, error) {
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pk := new(SecretKey).FromLEndian(p)
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if pk == nil || !pk.Valid() {
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return nil, fmt.Errorf("bls signature invalid private key")
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}
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return new(Signature).Sign(pk, msg, []byte(DST)).Compress(), nil
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}
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func (blsSigner) Verify(sig []byte, a address.Address, msg []byte) error {
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if !new(Signature).VerifyCompressed(sig, a.Payload()[:], msg, []byte(DST)) {
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return fmt.Errorf("bls signature failed to verify")
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}
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return nil
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}
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func init() {
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sigs.RegisterSignature(crypto.SigTypeBLS, blsSigner{})
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}
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