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110 lines
2.8 KiB
110 lines
2.8 KiB
package sr25519
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import (
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"crypto/subtle"
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"fmt"
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"io"
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"github.com/tendermint/tendermint/crypto"
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schnorrkel "github.com/ChainSafe/go-schnorrkel"
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)
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// PrivKeySize is the number of bytes in an Sr25519 private key.
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const PrivKeySize = 32
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// PrivKeySr25519 implements crypto.PrivKey.
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type PrivKey []byte
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// Bytes returns the byte representation of the PrivKey.
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func (privKey PrivKey) Bytes() []byte {
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return []byte(privKey)
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}
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// Sign produces a signature on the provided message.
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func (privKey PrivKey) Sign(msg []byte) ([]byte, error) {
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var p [PrivKeySize]byte
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copy(p[:], privKey)
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miniSecretKey, err := schnorrkel.NewMiniSecretKeyFromRaw(p)
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if err != nil {
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return []byte{}, err
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}
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secretKey := miniSecretKey.ExpandEd25519()
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signingContext := schnorrkel.NewSigningContext([]byte{}, msg)
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sig, err := secretKey.Sign(signingContext)
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if err != nil {
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return []byte{}, err
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}
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sigBytes := sig.Encode()
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return sigBytes[:], nil
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}
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// PubKey gets the corresponding public key from the private key.
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func (privKey PrivKey) PubKey() crypto.PubKey {
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var p [PrivKeySize]byte
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copy(p[:], privKey)
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miniSecretKey, err := schnorrkel.NewMiniSecretKeyFromRaw(p)
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if err != nil {
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panic(fmt.Sprintf("Invalid private key: %v", err))
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}
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secretKey := miniSecretKey.ExpandEd25519()
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pubkey, err := secretKey.Public()
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if err != nil {
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panic(fmt.Sprintf("Could not generate public key: %v", err))
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}
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key := pubkey.Encode()
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return PubKey(key[:])
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}
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// Equals - you probably don't need to use this.
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// Runs in constant time based on length of the keys.
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func (privKey PrivKey) Equals(other crypto.PrivKey) bool {
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if otherEd, ok := other.(PrivKey); ok {
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return subtle.ConstantTimeCompare(privKey[:], otherEd[:]) == 1
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}
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return false
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}
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func (privKey PrivKey) Type() string {
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return KeyType
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}
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// GenPrivKey generates a new sr25519 private key.
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// It uses OS randomness in conjunction with the current global random seed
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// in tendermint/libs/common to generate the private key.
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func GenPrivKey() PrivKey {
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return genPrivKey(crypto.CReader())
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}
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// genPrivKey generates a new sr25519 private key using the provided reader.
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func genPrivKey(rand io.Reader) PrivKey {
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var seed [64]byte
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out := make([]byte, 64)
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_, err := io.ReadFull(rand, out)
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if err != nil {
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panic(err)
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}
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copy(seed[:], out)
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key := schnorrkel.NewMiniSecretKey(seed).ExpandEd25519().Encode()
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return key[:]
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}
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// GenPrivKeyFromSecret hashes the secret with SHA2, and uses
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// that 32 byte output to create the private key.
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// NOTE: secret should be the output of a KDF like bcrypt,
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// if it's derived from user input.
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func GenPrivKeyFromSecret(secret []byte) PrivKey {
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seed := crypto.Sha256(secret) // Not Ripemd160 because we want 32 bytes.
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var bz [PrivKeySize]byte
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copy(bz[:], seed)
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privKey, _ := schnorrkel.NewMiniSecretKeyFromRaw(bz)
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key := privKey.ExpandEd25519().Encode()
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return key[:]
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}
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