diff options
Diffstat (limited to 'vendor/golang.org/x/crypto/ed25519/ed25519.go')
| -rw-r--r-- | vendor/golang.org/x/crypto/ed25519/ed25519.go | 188 |
1 files changed, 18 insertions, 170 deletions
diff --git a/vendor/golang.org/x/crypto/ed25519/ed25519.go b/vendor/golang.org/x/crypto/ed25519/ed25519.go index 71ad917d..a7828345 100644 --- a/vendor/golang.org/x/crypto/ed25519/ed25519.go +++ b/vendor/golang.org/x/crypto/ed25519/ed25519.go @@ -1,13 +1,7 @@ -// Copyright 2016 The Go Authors. All rights reserved. +// Copyright 2019 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. -// In Go 1.13, the ed25519 package was promoted to the standard library as -// crypto/ed25519, and this package became a wrapper for the standard library one. -// -//go:build !go1.13 -// +build !go1.13 - // Package ed25519 implements the Ed25519 signature algorithm. See // https://ed25519.cr.yp.to/. // @@ -16,21 +10,15 @@ // representation includes a public key suffix to make multiple signing // operations with the same key more efficient. This package refers to the RFC // 8032 private key as the “seed”. +// +// Beginning with Go 1.13, the functionality of this package was moved to the +// standard library as crypto/ed25519. This package only acts as a compatibility +// wrapper. package ed25519 -// This code is a port of the public domain, “ref10” implementation of ed25519 -// from SUPERCOP. - import ( - "bytes" - "crypto" - cryptorand "crypto/rand" - "crypto/sha512" - "errors" + "crypto/ed25519" "io" - "strconv" - - "golang.org/x/crypto/ed25519/internal/edwards25519" ) const ( @@ -45,57 +33,21 @@ const ( ) // PublicKey is the type of Ed25519 public keys. -type PublicKey []byte +// +// This type is an alias for crypto/ed25519's PublicKey type. +// See the crypto/ed25519 package for the methods on this type. +type PublicKey = ed25519.PublicKey // PrivateKey is the type of Ed25519 private keys. It implements crypto.Signer. -type PrivateKey []byte - -// Public returns the PublicKey corresponding to priv. -func (priv PrivateKey) Public() crypto.PublicKey { - publicKey := make([]byte, PublicKeySize) - copy(publicKey, priv[32:]) - return PublicKey(publicKey) -} - -// Seed returns the private key seed corresponding to priv. It is provided for -// interoperability with RFC 8032. RFC 8032's private keys correspond to seeds -// in this package. -func (priv PrivateKey) Seed() []byte { - seed := make([]byte, SeedSize) - copy(seed, priv[:32]) - return seed -} - -// Sign signs the given message with priv. -// 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 PrivateKey) 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 Sign(priv, message), nil -} +// +// This type is an alias for crypto/ed25519's PrivateKey type. +// See the crypto/ed25519 package for the methods on this type. +type PrivateKey = ed25519.PrivateKey // GenerateKey generates a public/private key pair using entropy from rand. // If rand is nil, crypto/rand.Reader will be used. func GenerateKey(rand io.Reader) (PublicKey, PrivateKey, error) { - if rand == nil { - rand = cryptorand.Reader - } - - seed := make([]byte, SeedSize) - if _, err := io.ReadFull(rand, seed); err != nil { - return nil, nil, err - } - - privateKey := NewKeyFromSeed(seed) - publicKey := make([]byte, PublicKeySize) - copy(publicKey, privateKey[32:]) - - return publicKey, privateKey, nil + return ed25519.GenerateKey(rand) } // NewKeyFromSeed calculates a private key from a seed. It will panic if @@ -103,121 +55,17 @@ func GenerateKey(rand io.Reader) (PublicKey, PrivateKey, error) { // with RFC 8032. RFC 8032's private keys correspond to seeds in this // package. func NewKeyFromSeed(seed []byte) PrivateKey { - if l := len(seed); l != SeedSize { - panic("ed25519: bad seed length: " + strconv.Itoa(l)) - } - - digest := sha512.Sum512(seed) - digest[0] &= 248 - digest[31] &= 127 - digest[31] |= 64 - - var A edwards25519.ExtendedGroupElement - var hBytes [32]byte - copy(hBytes[:], digest[:]) - edwards25519.GeScalarMultBase(&A, &hBytes) - var publicKeyBytes [32]byte - A.ToBytes(&publicKeyBytes) - - privateKey := make([]byte, PrivateKeySize) - copy(privateKey, seed) - copy(privateKey[32:], publicKeyBytes[:]) - - return privateKey + return ed25519.NewKeyFromSeed(seed) } // Sign signs the message with privateKey and returns a signature. It will // panic if len(privateKey) is not PrivateKeySize. func Sign(privateKey PrivateKey, message []byte) []byte { - if l := len(privateKey); l != PrivateKeySize { - panic("ed25519: bad private key length: " + strconv.Itoa(l)) - } - - h := sha512.New() - h.Write(privateKey[:32]) - - var digest1, messageDigest, hramDigest [64]byte - var expandedSecretKey [32]byte - h.Sum(digest1[:0]) - copy(expandedSecretKey[:], digest1[:]) - expandedSecretKey[0] &= 248 - expandedSecretKey[31] &= 63 - expandedSecretKey[31] |= 64 - - h.Reset() - h.Write(digest1[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) - - h.Reset() - h.Write(encodedR[:]) - h.Write(privateKey[32:]) - h.Write(message) - h.Sum(hramDigest[:0]) - var hramDigestReduced [32]byte - edwards25519.ScReduce(&hramDigestReduced, &hramDigest) - - var s [32]byte - edwards25519.ScMulAdd(&s, &hramDigestReduced, &expandedSecretKey, &messageDigestReduced) - - signature := make([]byte, SignatureSize) - copy(signature[:], encodedR[:]) - copy(signature[32:], s[:]) - - return signature + return ed25519.Sign(privateKey, message) } // Verify reports whether sig is a valid signature of message by publicKey. It // will panic if len(publicKey) is not PublicKeySize. func Verify(publicKey PublicKey, message, sig []byte) bool { - if l := len(publicKey); l != PublicKeySize { - panic("ed25519: bad public key length: " + strconv.Itoa(l)) - } - - if len(sig) != SignatureSize || sig[63]&224 != 0 { - return false - } - - var A edwards25519.ExtendedGroupElement - var publicKeyBytes [32]byte - copy(publicKeyBytes[:], publicKey) - if !A.FromBytes(&publicKeyBytes) { - return false - } - edwards25519.FeNeg(&A.X, &A.X) - edwards25519.FeNeg(&A.T, &A.T) - - h := sha512.New() - h.Write(sig[:32]) - h.Write(publicKey[:]) - h.Write(message) - var digest [64]byte - h.Sum(digest[:0]) - - var hReduced [32]byte - edwards25519.ScReduce(&hReduced, &digest) - - var R edwards25519.ProjectiveGroupElement - var s [32]byte - copy(s[:], sig[32:]) - - // https://tools.ietf.org/html/rfc8032#section-5.1.7 requires that s be in - // the range [0, order) in order to prevent signature malleability. - if !edwards25519.ScMinimal(&s) { - return false - } - - edwards25519.GeDoubleScalarMultVartime(&R, &hReduced, &A, &s) - - var checkR [32]byte - R.ToBytes(&checkR) - return bytes.Equal(sig[:32], checkR[:]) + return ed25519.Verify(publicKey, message, sig) } |