mirror of
https://github.com/go-gitea/gitea.git
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Vendor Update (#16121)
* update github.com/PuerkitoBio/goquery * update github.com/alecthomas/chroma * update github.com/blevesearch/bleve/v2 * update github.com/caddyserver/certmagic * update github.com/go-enry/go-enry/v2 * update github.com/go-git/go-billy/v5 * update github.com/go-git/go-git/v5 * update github.com/go-redis/redis/v8 * update github.com/go-testfixtures/testfixtures/v3 * update github.com/jaytaylor/html2text * update github.com/json-iterator/go * update github.com/klauspost/compress * update github.com/markbates/goth * update github.com/mattn/go-isatty * update github.com/mholt/archiver/v3 * update github.com/microcosm-cc/bluemonday * update github.com/minio/minio-go/v7 * update github.com/prometheus/client_golang * update github.com/unrolled/render * update github.com/xanzy/go-gitlab * update github.com/yuin/goldmark * update github.com/yuin/goldmark-highlighting Co-authored-by: techknowlogick <techknowlogick@gitea.io>
This commit is contained in:
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GitHub
780
vendor/github.com/ProtonMail/go-crypto/openpgp/packet/private_key.go
generated
vendored
Normal file
780
vendor/github.com/ProtonMail/go-crypto/openpgp/packet/private_key.go
generated
vendored
Normal file
@@ -0,0 +1,780 @@
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// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package packet
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import (
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"bytes"
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"crypto"
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"crypto/cipher"
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"crypto/dsa"
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"crypto/ecdsa"
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"crypto/elliptic"
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"crypto/rand"
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"crypto/rsa"
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"crypto/sha1"
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"fmt"
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"io"
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"io/ioutil"
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"math/big"
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"strconv"
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"time"
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"github.com/ProtonMail/go-crypto/openpgp/internal/ecc"
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"golang.org/x/crypto/curve25519"
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"github.com/ProtonMail/go-crypto/openpgp/ecdh"
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"github.com/ProtonMail/go-crypto/openpgp/elgamal"
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"github.com/ProtonMail/go-crypto/openpgp/errors"
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"github.com/ProtonMail/go-crypto/openpgp/internal/encoding"
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"github.com/ProtonMail/go-crypto/openpgp/s2k"
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"golang.org/x/crypto/ed25519"
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)
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// PrivateKey represents a possibly encrypted private key. See RFC 4880,
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// section 5.5.3.
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type PrivateKey struct {
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PublicKey
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Encrypted bool // if true then the private key is unavailable until Decrypt has been called.
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encryptedData []byte
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cipher CipherFunction
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s2k func(out, in []byte)
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// An *{rsa|dsa|elgamal|ecdh|ecdsa|ed25519}.PrivateKey or
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// crypto.Signer/crypto.Decrypter (Decryptor RSA only).
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PrivateKey interface{}
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sha1Checksum bool
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iv []byte
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// Type of encryption of the S2K packet
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// Allowed values are 0 (Not encrypted), 254 (SHA1), or
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// 255 (2-byte checksum)
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s2kType S2KType
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// Full parameters of the S2K packet
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s2kParams *s2k.Params
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}
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//S2KType s2k packet type
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type S2KType uint8
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const (
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// S2KNON unencrypt
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S2KNON S2KType = 0
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// S2KSHA1 sha1 sum check
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S2KSHA1 S2KType = 254
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// S2KCHECKSUM sum check
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S2KCHECKSUM S2KType = 255
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)
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func NewRSAPrivateKey(creationTime time.Time, priv *rsa.PrivateKey) *PrivateKey {
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pk := new(PrivateKey)
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pk.PublicKey = *NewRSAPublicKey(creationTime, &priv.PublicKey)
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pk.PrivateKey = priv
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return pk
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}
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func NewDSAPrivateKey(creationTime time.Time, priv *dsa.PrivateKey) *PrivateKey {
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pk := new(PrivateKey)
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pk.PublicKey = *NewDSAPublicKey(creationTime, &priv.PublicKey)
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pk.PrivateKey = priv
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return pk
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}
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func NewElGamalPrivateKey(creationTime time.Time, priv *elgamal.PrivateKey) *PrivateKey {
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pk := new(PrivateKey)
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pk.PublicKey = *NewElGamalPublicKey(creationTime, &priv.PublicKey)
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pk.PrivateKey = priv
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return pk
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}
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func NewECDSAPrivateKey(creationTime time.Time, priv *ecdsa.PrivateKey) *PrivateKey {
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pk := new(PrivateKey)
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pk.PublicKey = *NewECDSAPublicKey(creationTime, &priv.PublicKey)
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pk.PrivateKey = priv
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return pk
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}
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func NewEdDSAPrivateKey(creationTime time.Time, priv *ed25519.PrivateKey) *PrivateKey {
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pk := new(PrivateKey)
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pub := priv.Public().(ed25519.PublicKey)
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pk.PublicKey = *NewEdDSAPublicKey(creationTime, &pub)
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pk.PrivateKey = priv
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return pk
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}
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func NewECDHPrivateKey(creationTime time.Time, priv *ecdh.PrivateKey) *PrivateKey {
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pk := new(PrivateKey)
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pk.PublicKey = *NewECDHPublicKey(creationTime, &priv.PublicKey)
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pk.PrivateKey = priv
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return pk
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}
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// NewSignerPrivateKey creates a PrivateKey from a crypto.Signer that
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// implements RSA, ECDSA or EdDSA.
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func NewSignerPrivateKey(creationTime time.Time, signer crypto.Signer) *PrivateKey {
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pk := new(PrivateKey)
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// In general, the public Keys should be used as pointers. We still
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// type-switch on the values, for backwards-compatibility.
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switch pubkey := signer.Public().(type) {
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case *rsa.PublicKey:
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pk.PublicKey = *NewRSAPublicKey(creationTime, pubkey)
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case rsa.PublicKey:
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pk.PublicKey = *NewRSAPublicKey(creationTime, &pubkey)
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case *ecdsa.PublicKey:
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pk.PublicKey = *NewECDSAPublicKey(creationTime, pubkey)
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case ecdsa.PublicKey:
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pk.PublicKey = *NewECDSAPublicKey(creationTime, &pubkey)
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case *ed25519.PublicKey:
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pk.PublicKey = *NewEdDSAPublicKey(creationTime, pubkey)
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case ed25519.PublicKey:
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pk.PublicKey = *NewEdDSAPublicKey(creationTime, &pubkey)
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default:
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panic("openpgp: unknown crypto.Signer type in NewSignerPrivateKey")
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}
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pk.PrivateKey = signer
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return pk
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}
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// NewDecrypterPrivateKey creates a PrivateKey from a *{rsa|elgamal|ecdh}.PrivateKey.
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func NewDecrypterPrivateKey(creationTime time.Time, decrypter interface{}) *PrivateKey {
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pk := new(PrivateKey)
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switch priv := decrypter.(type) {
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case *rsa.PrivateKey:
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pk.PublicKey = *NewRSAPublicKey(creationTime, &priv.PublicKey)
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case *elgamal.PrivateKey:
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pk.PublicKey = *NewElGamalPublicKey(creationTime, &priv.PublicKey)
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case *ecdh.PrivateKey:
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pk.PublicKey = *NewECDHPublicKey(creationTime, &priv.PublicKey)
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default:
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panic("openpgp: unknown decrypter type in NewDecrypterPrivateKey")
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}
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pk.PrivateKey = decrypter
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return pk
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}
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func (pk *PrivateKey) parse(r io.Reader) (err error) {
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err = (&pk.PublicKey).parse(r)
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if err != nil {
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return
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}
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v5 := pk.PublicKey.Version == 5
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var buf [1]byte
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_, err = readFull(r, buf[:])
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if err != nil {
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return
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}
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pk.s2kType = S2KType(buf[0])
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var optCount [1]byte
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if v5 {
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if _, err = readFull(r, optCount[:]); err != nil {
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return
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}
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}
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switch pk.s2kType {
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case S2KNON:
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pk.s2k = nil
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pk.Encrypted = false
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case S2KSHA1, S2KCHECKSUM:
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if v5 && pk.s2kType == S2KCHECKSUM {
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return errors.StructuralError("wrong s2k identifier for version 5")
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}
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_, err = readFull(r, buf[:])
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if err != nil {
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return
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}
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pk.cipher = CipherFunction(buf[0])
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pk.s2kParams, err = s2k.ParseIntoParams(r)
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if err != nil {
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return
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}
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if pk.s2kParams.Dummy() {
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return
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}
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pk.s2k, err = pk.s2kParams.Function()
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if err != nil {
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return
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}
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pk.Encrypted = true
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if pk.s2kType == S2KSHA1 {
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pk.sha1Checksum = true
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}
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default:
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return errors.UnsupportedError("deprecated s2k function in private key")
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}
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if pk.Encrypted {
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blockSize := pk.cipher.blockSize()
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if blockSize == 0 {
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return errors.UnsupportedError("unsupported cipher in private key: " + strconv.Itoa(int(pk.cipher)))
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}
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pk.iv = make([]byte, blockSize)
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_, err = readFull(r, pk.iv)
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if err != nil {
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return
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}
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}
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var privateKeyData []byte
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if v5 {
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var n [4]byte /* secret material four octet count */
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_, err = readFull(r, n[:])
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if err != nil {
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return
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}
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count := uint32(uint32(n[0])<<24 | uint32(n[1])<<16 | uint32(n[2])<<8 | uint32(n[3]))
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if !pk.Encrypted {
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count = count + 2 /* two octet checksum */
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}
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privateKeyData = make([]byte, count)
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_, err = readFull(r, privateKeyData)
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if err != nil {
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return
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}
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} else {
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privateKeyData, err = ioutil.ReadAll(r)
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if err != nil {
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return
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}
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}
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if !pk.Encrypted {
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return pk.parsePrivateKey(privateKeyData)
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}
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pk.encryptedData = privateKeyData
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return
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}
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// Dummy returns true if the private key is a dummy key. This is a GNU extension.
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func (pk *PrivateKey) Dummy() bool {
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return pk.s2kParams.Dummy()
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}
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func mod64kHash(d []byte) uint16 {
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var h uint16
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for _, b := range d {
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h += uint16(b)
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}
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return h
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}
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func (pk *PrivateKey) Serialize(w io.Writer) (err error) {
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contents := bytes.NewBuffer(nil)
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err = pk.PublicKey.serializeWithoutHeaders(contents)
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if err != nil {
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return
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}
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if _, err = contents.Write([]byte{uint8(pk.s2kType)}); err != nil {
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return
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}
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optional := bytes.NewBuffer(nil)
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if pk.Encrypted || pk.Dummy() {
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optional.Write([]byte{uint8(pk.cipher)})
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if err := pk.s2kParams.Serialize(optional); err != nil {
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return err
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}
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if pk.Encrypted {
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optional.Write(pk.iv)
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}
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}
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if pk.Version == 5 {
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contents.Write([]byte{uint8(optional.Len())})
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}
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io.Copy(contents, optional)
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if !pk.Dummy() {
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l := 0
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var priv []byte
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if !pk.Encrypted {
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buf := bytes.NewBuffer(nil)
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err = pk.serializePrivateKey(buf)
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if err != nil {
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return err
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}
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l = buf.Len()
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if pk.sha1Checksum {
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h := sha1.New()
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h.Write(buf.Bytes())
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buf.Write(h.Sum(nil))
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} else {
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checksum := mod64kHash(buf.Bytes())
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buf.Write([]byte{byte(checksum >> 8), byte(checksum)})
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}
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priv = buf.Bytes()
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} else {
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priv, l = pk.encryptedData, len(pk.encryptedData)
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}
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||||
if pk.Version == 5 {
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||||
contents.Write([]byte{byte(l >> 24), byte(l >> 16), byte(l >> 8), byte(l)})
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}
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contents.Write(priv)
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}
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ptype := packetTypePrivateKey
|
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if pk.IsSubkey {
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ptype = packetTypePrivateSubkey
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}
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err = serializeHeader(w, ptype, contents.Len())
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||||
if err != nil {
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||||
return
|
||||
}
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||||
_, err = io.Copy(w, contents)
|
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if err != nil {
|
||||
return
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
func serializeRSAPrivateKey(w io.Writer, priv *rsa.PrivateKey) error {
|
||||
if _, err := w.Write(new(encoding.MPI).SetBig(priv.D).EncodedBytes()); err != nil {
|
||||
return err
|
||||
}
|
||||
if _, err := w.Write(new(encoding.MPI).SetBig(priv.Primes[1]).EncodedBytes()); err != nil {
|
||||
return err
|
||||
}
|
||||
if _, err := w.Write(new(encoding.MPI).SetBig(priv.Primes[0]).EncodedBytes()); err != nil {
|
||||
return err
|
||||
}
|
||||
_, err := w.Write(new(encoding.MPI).SetBig(priv.Precomputed.Qinv).EncodedBytes())
|
||||
return err
|
||||
}
|
||||
|
||||
func serializeDSAPrivateKey(w io.Writer, priv *dsa.PrivateKey) error {
|
||||
_, err := w.Write(new(encoding.MPI).SetBig(priv.X).EncodedBytes())
|
||||
return err
|
||||
}
|
||||
|
||||
func serializeElGamalPrivateKey(w io.Writer, priv *elgamal.PrivateKey) error {
|
||||
_, err := w.Write(new(encoding.MPI).SetBig(priv.X).EncodedBytes())
|
||||
return err
|
||||
}
|
||||
|
||||
func serializeECDSAPrivateKey(w io.Writer, priv *ecdsa.PrivateKey) error {
|
||||
_, err := w.Write(new(encoding.MPI).SetBig(priv.D).EncodedBytes())
|
||||
return err
|
||||
}
|
||||
|
||||
func serializeEdDSAPrivateKey(w io.Writer, priv *ed25519.PrivateKey) error {
|
||||
keySize := ed25519.PrivateKeySize - ed25519.PublicKeySize
|
||||
_, err := w.Write(encoding.NewMPI((*priv)[:keySize]).EncodedBytes())
|
||||
return err
|
||||
}
|
||||
|
||||
func serializeECDHPrivateKey(w io.Writer, priv *ecdh.PrivateKey) error {
|
||||
_, err := w.Write(encoding.NewMPI(priv.D).EncodedBytes())
|
||||
return err
|
||||
}
|
||||
|
||||
// Decrypt decrypts an encrypted private key using a passphrase.
|
||||
func (pk *PrivateKey) Decrypt(passphrase []byte) error {
|
||||
if pk.Dummy() {
|
||||
return errors.ErrDummyPrivateKey("dummy key found")
|
||||
}
|
||||
if !pk.Encrypted {
|
||||
return nil
|
||||
}
|
||||
|
||||
key := make([]byte, pk.cipher.KeySize())
|
||||
pk.s2k(key, passphrase)
|
||||
block := pk.cipher.new(key)
|
||||
cfb := cipher.NewCFBDecrypter(block, pk.iv)
|
||||
|
||||
data := make([]byte, len(pk.encryptedData))
|
||||
cfb.XORKeyStream(data, pk.encryptedData)
|
||||
|
||||
if pk.sha1Checksum {
|
||||
if len(data) < sha1.Size {
|
||||
return errors.StructuralError("truncated private key data")
|
||||
}
|
||||
h := sha1.New()
|
||||
h.Write(data[:len(data)-sha1.Size])
|
||||
sum := h.Sum(nil)
|
||||
if !bytes.Equal(sum, data[len(data)-sha1.Size:]) {
|
||||
return errors.StructuralError("private key checksum failure")
|
||||
}
|
||||
data = data[:len(data)-sha1.Size]
|
||||
} else {
|
||||
if len(data) < 2 {
|
||||
return errors.StructuralError("truncated private key data")
|
||||
}
|
||||
var sum uint16
|
||||
for i := 0; i < len(data)-2; i++ {
|
||||
sum += uint16(data[i])
|
||||
}
|
||||
if data[len(data)-2] != uint8(sum>>8) ||
|
||||
data[len(data)-1] != uint8(sum) {
|
||||
return errors.StructuralError("private key checksum failure")
|
||||
}
|
||||
data = data[:len(data)-2]
|
||||
}
|
||||
|
||||
err := pk.parsePrivateKey(data)
|
||||
if _, ok := err.(errors.KeyInvalidError); ok {
|
||||
return errors.KeyInvalidError("invalid key parameters")
|
||||
}
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
// Mark key as unencrypted
|
||||
pk.s2kType = S2KNON
|
||||
pk.s2k = nil
|
||||
pk.Encrypted = false
|
||||
pk.encryptedData = nil
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
// Encrypt encrypts an unencrypted private key using a passphrase.
|
||||
func (pk *PrivateKey) Encrypt(passphrase []byte) error {
|
||||
priv := bytes.NewBuffer(nil)
|
||||
err := pk.serializePrivateKey(priv)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
//Default config of private key encryption
|
||||
pk.cipher = CipherAES256
|
||||
s2kConfig := &s2k.Config{
|
||||
S2KMode: 3, //Iterated
|
||||
S2KCount: 65536,
|
||||
Hash: crypto.SHA256,
|
||||
}
|
||||
|
||||
pk.s2kParams, err = s2k.Generate(rand.Reader, s2kConfig)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
privateKeyBytes := priv.Bytes()
|
||||
key := make([]byte, pk.cipher.KeySize())
|
||||
|
||||
pk.sha1Checksum = true
|
||||
pk.s2k, err = pk.s2kParams.Function()
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
pk.s2k(key, passphrase)
|
||||
block := pk.cipher.new(key)
|
||||
pk.iv = make([]byte, pk.cipher.blockSize())
|
||||
_, err = rand.Read(pk.iv)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
cfb := cipher.NewCFBEncrypter(block, pk.iv)
|
||||
|
||||
if pk.sha1Checksum {
|
||||
pk.s2kType = S2KSHA1
|
||||
h := sha1.New()
|
||||
h.Write(privateKeyBytes)
|
||||
sum := h.Sum(nil)
|
||||
privateKeyBytes = append(privateKeyBytes, sum...)
|
||||
} else {
|
||||
pk.s2kType = S2KCHECKSUM
|
||||
var sum uint16
|
||||
for _, b := range privateKeyBytes {
|
||||
sum += uint16(b)
|
||||
}
|
||||
priv.Write([]byte{uint8(sum >> 8), uint8(sum)})
|
||||
}
|
||||
|
||||
pk.encryptedData = make([]byte, len(privateKeyBytes))
|
||||
cfb.XORKeyStream(pk.encryptedData, privateKeyBytes)
|
||||
pk.Encrypted = true
|
||||
pk.PrivateKey = nil
|
||||
return err
|
||||
}
|
||||
|
||||
func (pk *PrivateKey) serializePrivateKey(w io.Writer) (err error) {
|
||||
switch priv := pk.PrivateKey.(type) {
|
||||
case *rsa.PrivateKey:
|
||||
err = serializeRSAPrivateKey(w, priv)
|
||||
case *dsa.PrivateKey:
|
||||
err = serializeDSAPrivateKey(w, priv)
|
||||
case *elgamal.PrivateKey:
|
||||
err = serializeElGamalPrivateKey(w, priv)
|
||||
case *ecdsa.PrivateKey:
|
||||
err = serializeECDSAPrivateKey(w, priv)
|
||||
case *ed25519.PrivateKey:
|
||||
err = serializeEdDSAPrivateKey(w, priv)
|
||||
case *ecdh.PrivateKey:
|
||||
err = serializeECDHPrivateKey(w, priv)
|
||||
default:
|
||||
err = errors.InvalidArgumentError("unknown private key type")
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
func (pk *PrivateKey) parsePrivateKey(data []byte) (err error) {
|
||||
switch pk.PublicKey.PubKeyAlgo {
|
||||
case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly, PubKeyAlgoRSAEncryptOnly:
|
||||
return pk.parseRSAPrivateKey(data)
|
||||
case PubKeyAlgoDSA:
|
||||
return pk.parseDSAPrivateKey(data)
|
||||
case PubKeyAlgoElGamal:
|
||||
return pk.parseElGamalPrivateKey(data)
|
||||
case PubKeyAlgoECDSA:
|
||||
return pk.parseECDSAPrivateKey(data)
|
||||
case PubKeyAlgoECDH:
|
||||
return pk.parseECDHPrivateKey(data)
|
||||
case PubKeyAlgoEdDSA:
|
||||
return pk.parseEdDSAPrivateKey(data)
|
||||
}
|
||||
panic("impossible")
|
||||
}
|
||||
|
||||
func (pk *PrivateKey) parseRSAPrivateKey(data []byte) (err error) {
|
||||
rsaPub := pk.PublicKey.PublicKey.(*rsa.PublicKey)
|
||||
rsaPriv := new(rsa.PrivateKey)
|
||||
rsaPriv.PublicKey = *rsaPub
|
||||
|
||||
buf := bytes.NewBuffer(data)
|
||||
d := new(encoding.MPI)
|
||||
if _, err := d.ReadFrom(buf); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
p := new(encoding.MPI)
|
||||
if _, err := p.ReadFrom(buf); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
q := new(encoding.MPI)
|
||||
if _, err := q.ReadFrom(buf); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
rsaPriv.D = new(big.Int).SetBytes(d.Bytes())
|
||||
rsaPriv.Primes = make([]*big.Int, 2)
|
||||
rsaPriv.Primes[0] = new(big.Int).SetBytes(p.Bytes())
|
||||
rsaPriv.Primes[1] = new(big.Int).SetBytes(q.Bytes())
|
||||
if err := rsaPriv.Validate(); err != nil {
|
||||
return errors.KeyInvalidError(err.Error())
|
||||
}
|
||||
rsaPriv.Precompute()
|
||||
pk.PrivateKey = rsaPriv
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
func (pk *PrivateKey) parseDSAPrivateKey(data []byte) (err error) {
|
||||
dsaPub := pk.PublicKey.PublicKey.(*dsa.PublicKey)
|
||||
dsaPriv := new(dsa.PrivateKey)
|
||||
dsaPriv.PublicKey = *dsaPub
|
||||
|
||||
buf := bytes.NewBuffer(data)
|
||||
x := new(encoding.MPI)
|
||||
if _, err := x.ReadFrom(buf); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
dsaPriv.X = new(big.Int).SetBytes(x.Bytes())
|
||||
if err := validateDSAParameters(dsaPriv); err != nil {
|
||||
return err
|
||||
}
|
||||
pk.PrivateKey = dsaPriv
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
func (pk *PrivateKey) parseElGamalPrivateKey(data []byte) (err error) {
|
||||
pub := pk.PublicKey.PublicKey.(*elgamal.PublicKey)
|
||||
priv := new(elgamal.PrivateKey)
|
||||
priv.PublicKey = *pub
|
||||
|
||||
buf := bytes.NewBuffer(data)
|
||||
x := new(encoding.MPI)
|
||||
if _, err := x.ReadFrom(buf); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
priv.X = new(big.Int).SetBytes(x.Bytes())
|
||||
if err := validateElGamalParameters(priv); err != nil {
|
||||
return err
|
||||
}
|
||||
pk.PrivateKey = priv
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
func (pk *PrivateKey) parseECDSAPrivateKey(data []byte) (err error) {
|
||||
ecdsaPub := pk.PublicKey.PublicKey.(*ecdsa.PublicKey)
|
||||
ecdsaPriv := new(ecdsa.PrivateKey)
|
||||
ecdsaPriv.PublicKey = *ecdsaPub
|
||||
|
||||
buf := bytes.NewBuffer(data)
|
||||
d := new(encoding.MPI)
|
||||
if _, err := d.ReadFrom(buf); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
ecdsaPriv.D = new(big.Int).SetBytes(d.Bytes())
|
||||
if err := validateECDSAParameters(ecdsaPriv); err != nil {
|
||||
return err
|
||||
}
|
||||
pk.PrivateKey = ecdsaPriv
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
func (pk *PrivateKey) parseECDHPrivateKey(data []byte) (err error) {
|
||||
ecdhPub := pk.PublicKey.PublicKey.(*ecdh.PublicKey)
|
||||
ecdhPriv := new(ecdh.PrivateKey)
|
||||
ecdhPriv.PublicKey = *ecdhPub
|
||||
|
||||
buf := bytes.NewBuffer(data)
|
||||
d := new(encoding.MPI)
|
||||
if _, err := d.ReadFrom(buf); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
ecdhPriv.D = d.Bytes()
|
||||
if err := validateECDHParameters(ecdhPriv); err != nil {
|
||||
return err
|
||||
}
|
||||
pk.PrivateKey = ecdhPriv
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
func (pk *PrivateKey) parseEdDSAPrivateKey(data []byte) (err error) {
|
||||
eddsaPub := pk.PublicKey.PublicKey.(*ed25519.PublicKey)
|
||||
eddsaPriv := make(ed25519.PrivateKey, ed25519.PrivateKeySize)
|
||||
|
||||
buf := bytes.NewBuffer(data)
|
||||
d := new(encoding.MPI)
|
||||
if _, err := d.ReadFrom(buf); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
priv := d.Bytes()
|
||||
copy(eddsaPriv[32-len(priv):32], priv)
|
||||
copy(eddsaPriv[32:], (*eddsaPub)[:])
|
||||
if err := validateEdDSAParameters(&eddsaPriv); err != nil {
|
||||
return err
|
||||
}
|
||||
pk.PrivateKey = &eddsaPriv
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
func validateECDSAParameters(priv *ecdsa.PrivateKey) error {
|
||||
return validateCommonECC(priv.Curve, priv.D.Bytes(), priv.X, priv.Y)
|
||||
}
|
||||
|
||||
func validateECDHParameters(priv *ecdh.PrivateKey) error {
|
||||
if priv.CurveType != ecc.Curve25519 {
|
||||
return validateCommonECC(priv.Curve, priv.D, priv.X, priv.Y)
|
||||
}
|
||||
// Handle Curve25519
|
||||
Q := priv.X.Bytes()[1:]
|
||||
var d [32]byte
|
||||
// Copy reversed d
|
||||
l := len(priv.D)
|
||||
for i := 0; i < l; i++ {
|
||||
d[i] = priv.D[l-i-1]
|
||||
}
|
||||
var expectedQ [32]byte
|
||||
curve25519.ScalarBaseMult(&expectedQ, &d)
|
||||
if !bytes.Equal(Q, expectedQ[:]) {
|
||||
return errors.KeyInvalidError("ECDH curve25519: invalid point")
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func validateCommonECC(curve elliptic.Curve, d []byte, X, Y *big.Int) error {
|
||||
// the public point should not be at infinity (0,0)
|
||||
zero := new(big.Int)
|
||||
if X.Cmp(zero) == 0 && Y.Cmp(zero) == 0 {
|
||||
return errors.KeyInvalidError(fmt.Sprintf("ecc (%s): infinity point", curve.Params().Name))
|
||||
}
|
||||
// re-derive the public point Q' = (X,Y) = dG
|
||||
// to compare to declared Q in public key
|
||||
expectedX, expectedY := curve.ScalarBaseMult(d)
|
||||
if X.Cmp(expectedX) != 0 || Y.Cmp(expectedY) != 0 {
|
||||
return errors.KeyInvalidError(fmt.Sprintf("ecc (%s): invalid point", curve.Params().Name))
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func validateEdDSAParameters(priv *ed25519.PrivateKey) error {
|
||||
// In EdDSA, the serialized public point is stored as part of private key (together with the seed),
|
||||
// hence we can re-derive the key from the seed
|
||||
seed := priv.Seed()
|
||||
expectedPriv := ed25519.NewKeyFromSeed(seed)
|
||||
if !bytes.Equal(*priv, expectedPriv) {
|
||||
return errors.KeyInvalidError("eddsa: invalid point")
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func validateDSAParameters(priv *dsa.PrivateKey) error {
|
||||
p := priv.P // group prime
|
||||
q := priv.Q // subgroup order
|
||||
g := priv.G // g has order q mod p
|
||||
x := priv.X // secret
|
||||
y := priv.Y // y == g**x mod p
|
||||
one := big.NewInt(1)
|
||||
// expect g, y >= 2 and g < p
|
||||
if g.Cmp(one) <= 0 || y.Cmp(one) <= 0 || g.Cmp(p) > 0 {
|
||||
return errors.KeyInvalidError("dsa: invalid group")
|
||||
}
|
||||
// expect p > q
|
||||
if p.Cmp(q) <= 0 {
|
||||
return errors.KeyInvalidError("dsa: invalid group prime")
|
||||
}
|
||||
// q should be large enough and divide p-1
|
||||
pSub1 := new(big.Int).Sub(p, one)
|
||||
if q.BitLen() < 150 || new(big.Int).Mod(pSub1, q).Cmp(big.NewInt(0)) != 0 {
|
||||
return errors.KeyInvalidError("dsa: invalid order")
|
||||
}
|
||||
// confirm that g has order q mod p
|
||||
if !q.ProbablyPrime(32) || new(big.Int).Exp(g, q, p).Cmp(one) != 0 {
|
||||
return errors.KeyInvalidError("dsa: invalid order")
|
||||
}
|
||||
// check y
|
||||
if new(big.Int).Exp(g, x, p).Cmp(y) != 0 {
|
||||
return errors.KeyInvalidError("dsa: mismatching values")
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
func validateElGamalParameters(priv *elgamal.PrivateKey) error {
|
||||
p := priv.P // group prime
|
||||
g := priv.G // g has order p-1 mod p
|
||||
x := priv.X // secret
|
||||
y := priv.Y // y == g**x mod p
|
||||
one := big.NewInt(1)
|
||||
// Expect g, y >= 2 and g < p
|
||||
if g.Cmp(one) <= 0 || y.Cmp(one) <= 0 || g.Cmp(p) > 0 {
|
||||
return errors.KeyInvalidError("elgamal: invalid group")
|
||||
}
|
||||
if p.BitLen() < 1024 {
|
||||
return errors.KeyInvalidError("elgamal: group order too small")
|
||||
}
|
||||
pSub1 := new(big.Int).Sub(p, one)
|
||||
if new(big.Int).Exp(g, pSub1, p).Cmp(one) != 0 {
|
||||
return errors.KeyInvalidError("elgamal: invalid group")
|
||||
}
|
||||
// Since p-1 is not prime, g might have a smaller order that divides p-1.
|
||||
// We cannot confirm the exact order of g, but we make sure it is not too small.
|
||||
gExpI := new(big.Int).Set(g)
|
||||
i := 1
|
||||
threshold := 2 << 17 // we want order > threshold
|
||||
for i < threshold {
|
||||
i++ // we check every order to make sure key validation is not easily bypassed by guessing y'
|
||||
gExpI.Mod(new(big.Int).Mul(gExpI, g), p)
|
||||
if gExpI.Cmp(one) == 0 {
|
||||
return errors.KeyInvalidError("elgamal: order too small")
|
||||
}
|
||||
}
|
||||
// Check y
|
||||
if new(big.Int).Exp(g, x, p).Cmp(y) != 0 {
|
||||
return errors.KeyInvalidError("elgamal: mismatching values")
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
Reference in New Issue
Block a user