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[bytom/vapor.git] / crypto / ed25519 / chainkd / expanded_key.go

diff --git a/crypto/ed25519/chainkd/expanded_key.go b/crypto/ed25519/chainkd/expanded_key.go
deleted file mode 100644 (file)
index 5926b28..0000000
--- a/crypto/ed25519/chainkd/expanded_key.go
+++ /dev/null
@@ -1,102 +0,0 @@
-// Package chainkd This is an extension to ed25519.Sign that is compatible with NaCl `crypto_sign`
-// function taking 64-byte expanded private key (where the left part is a pre-multiplied
-// scalar and the right part is "prefix" used for generating a nonce).
-//
-// Invariants:
-// 1) Expanded(PrivateKey).Sign() == PrivateKey.Sign()
-// 2) InnerSign(Expanded(PrivateKey)) == Sign(PrivateKey)
-package chainkd
-
-import (
-       "crypto"
-       "crypto/sha512"
-       "errors"
-       "io"
-       "strconv"
-
-       "github.com/vapor/crypto/ed25519"
-       "github.com/vapor/crypto/ed25519/internal/edwards25519"
-)
-
-const (
-       // ExpandedPrivateKeySize is the size, in bytes, of a "secret key" as defined in NaCl.
-       ExpandedPrivateKeySize = 64
-)
-
-// ExpandedPrivateKey is the type of NaCl secret keys. It implements crypto.Signer.
-type ExpandedPrivateKey []byte
-
-// Public returns the PublicKey corresponding to secret key.
-func (priv ExpandedPrivateKey) Public() crypto.PublicKey {
-       var A edwards25519.ExtendedGroupElement
-       var scalar [32]byte
-       copy(scalar[:], priv[:32])
-       edwards25519.GeScalarMultBase(&A, &scalar)
-       var publicKeyBytes [32]byte
-       A.ToBytes(&publicKeyBytes)
-       return ed25519.PublicKey(publicKeyBytes[:])
-}
-
-func expandEd25519PrivateKey(priv ed25519.PrivateKey) ExpandedPrivateKey {
-       digest := sha512.Sum512(priv[:32])
-       digest[0] &= 248
-       digest[31] &= 127
-       digest[31] |= 64
-       return ExpandedPrivateKey(digest[:])
-}
-
-// Sign signs the given message with expanded private key.
-// Ed25519 performs two passes over messages to be signed and therefore cannot
-// handle pre-hashed messages. Thus opts.HashFunc() must return zero to
-// indicate the message hasn't been hashed. This can be achieved by passing
-// crypto.Hash(0) as the value for opts.
-func (priv ExpandedPrivateKey) Sign(rand io.Reader, message []byte, opts crypto.SignerOpts) (signature []byte, err error) {
-       if opts.HashFunc() != crypto.Hash(0) {
-               return nil, errors.New("ed25519: cannot sign hashed message")
-       }
-
-       return Ed25519InnerSign(priv, message), nil
-}
-
-// Ed25519InnerSign signs the message with expanded private key and returns a signature.
-// It will panic if len(privateKey) is not ExpandedPrivateKeySize.
-func Ed25519InnerSign(privateKey ExpandedPrivateKey, message []byte) []byte {
-       if l := len(privateKey); l != ExpandedPrivateKeySize {
-               panic("ed25519: bad private key length: " + strconv.Itoa(l))
-       }
-
-       var messageDigest, hramDigest [64]byte
-
-       h := sha512.New()
-       h.Write(privateKey[32:])
-       h.Write(message)
-       h.Sum(messageDigest[:0])
-
-       var messageDigestReduced [32]byte
-       edwards25519.ScReduce(&messageDigestReduced, &messageDigest)
-       var R edwards25519.ExtendedGroupElement
-       edwards25519.GeScalarMultBase(&R, &messageDigestReduced)
-
-       var encodedR [32]byte
-       R.ToBytes(&encodedR)
-
-       publicKey := privateKey.Public().(ed25519.PublicKey)
-       h.Reset()
-       h.Write(encodedR[:])
-       h.Write(publicKey[:])
-       h.Write(message)
-       h.Sum(hramDigest[:0])
-       var hramDigestReduced [32]byte
-       edwards25519.ScReduce(&hramDigestReduced, &hramDigest)
-
-       var sk [32]byte
-       copy(sk[:], privateKey[:32])
-       var s [32]byte
-       edwards25519.ScMulAdd(&s, &hramDigestReduced, &sk, &messageDigestReduced)
-
-       signature := make([]byte, ed25519.SignatureSize)
-       copy(signature[:], encodedR[:])
-       copy(signature[32:], s[:])
-
-       return signature
-}