mirror of https://github.com/hashicorp/consul
761 lines
21 KiB
Go
761 lines
21 KiB
Go
/*-
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* Copyright 2014 Square Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package jose
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import (
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"bytes"
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"crypto"
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"crypto/ecdsa"
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"crypto/elliptic"
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"crypto/rsa"
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"crypto/sha1"
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"crypto/sha256"
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"crypto/x509"
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"encoding/base64"
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"encoding/hex"
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"errors"
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"fmt"
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"math/big"
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"net/url"
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"reflect"
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"strings"
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"golang.org/x/crypto/ed25519"
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"gopkg.in/square/go-jose.v2/json"
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)
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// rawJSONWebKey represents a public or private key in JWK format, used for parsing/serializing.
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type rawJSONWebKey struct {
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Use string `json:"use,omitempty"`
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Kty string `json:"kty,omitempty"`
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Kid string `json:"kid,omitempty"`
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Crv string `json:"crv,omitempty"`
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Alg string `json:"alg,omitempty"`
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K *byteBuffer `json:"k,omitempty"`
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X *byteBuffer `json:"x,omitempty"`
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Y *byteBuffer `json:"y,omitempty"`
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N *byteBuffer `json:"n,omitempty"`
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E *byteBuffer `json:"e,omitempty"`
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// -- Following fields are only used for private keys --
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// RSA uses D, P and Q, while ECDSA uses only D. Fields Dp, Dq, and Qi are
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// completely optional. Therefore for RSA/ECDSA, D != nil is a contract that
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// we have a private key whereas D == nil means we have only a public key.
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D *byteBuffer `json:"d,omitempty"`
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P *byteBuffer `json:"p,omitempty"`
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Q *byteBuffer `json:"q,omitempty"`
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Dp *byteBuffer `json:"dp,omitempty"`
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Dq *byteBuffer `json:"dq,omitempty"`
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Qi *byteBuffer `json:"qi,omitempty"`
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// Certificates
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X5c []string `json:"x5c,omitempty"`
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X5u *url.URL `json:"x5u,omitempty"`
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X5tSHA1 string `json:"x5t,omitempty"`
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X5tSHA256 string `json:"x5t#S256,omitempty"`
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}
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// JSONWebKey represents a public or private key in JWK format.
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type JSONWebKey struct {
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// Cryptographic key, can be a symmetric or asymmetric key.
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Key interface{}
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// Key identifier, parsed from `kid` header.
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KeyID string
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// Key algorithm, parsed from `alg` header.
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Algorithm string
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// Key use, parsed from `use` header.
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Use string
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// X.509 certificate chain, parsed from `x5c` header.
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Certificates []*x509.Certificate
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// X.509 certificate URL, parsed from `x5u` header.
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CertificatesURL *url.URL
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// X.509 certificate thumbprint (SHA-1), parsed from `x5t` header.
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CertificateThumbprintSHA1 []byte
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// X.509 certificate thumbprint (SHA-256), parsed from `x5t#S256` header.
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CertificateThumbprintSHA256 []byte
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}
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// MarshalJSON serializes the given key to its JSON representation.
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func (k JSONWebKey) MarshalJSON() ([]byte, error) {
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var raw *rawJSONWebKey
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var err error
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switch key := k.Key.(type) {
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case ed25519.PublicKey:
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raw = fromEdPublicKey(key)
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case *ecdsa.PublicKey:
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raw, err = fromEcPublicKey(key)
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case *rsa.PublicKey:
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raw = fromRsaPublicKey(key)
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case ed25519.PrivateKey:
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raw, err = fromEdPrivateKey(key)
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case *ecdsa.PrivateKey:
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raw, err = fromEcPrivateKey(key)
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case *rsa.PrivateKey:
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raw, err = fromRsaPrivateKey(key)
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case []byte:
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raw, err = fromSymmetricKey(key)
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default:
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return nil, fmt.Errorf("square/go-jose: unknown key type '%s'", reflect.TypeOf(key))
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}
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if err != nil {
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return nil, err
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}
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raw.Kid = k.KeyID
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raw.Alg = k.Algorithm
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raw.Use = k.Use
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for _, cert := range k.Certificates {
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raw.X5c = append(raw.X5c, base64.StdEncoding.EncodeToString(cert.Raw))
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}
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x5tSHA1Len := len(k.CertificateThumbprintSHA1)
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x5tSHA256Len := len(k.CertificateThumbprintSHA256)
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if x5tSHA1Len > 0 {
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if x5tSHA1Len != sha1.Size {
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return nil, fmt.Errorf("square/go-jose: invalid SHA-1 thumbprint (must be %d bytes, not %d)", sha1.Size, x5tSHA1Len)
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}
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raw.X5tSHA1 = base64.RawURLEncoding.EncodeToString(k.CertificateThumbprintSHA1)
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}
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if x5tSHA256Len > 0 {
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if x5tSHA256Len != sha256.Size {
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return nil, fmt.Errorf("square/go-jose: invalid SHA-256 thumbprint (must be %d bytes, not %d)", sha256.Size, x5tSHA256Len)
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}
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raw.X5tSHA256 = base64.RawURLEncoding.EncodeToString(k.CertificateThumbprintSHA256)
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}
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// If cert chain is attached (as opposed to being behind a URL), check the
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// keys thumbprints to make sure they match what is expected. This is to
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// ensure we don't accidentally produce a JWK with semantically inconsistent
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// data in the headers.
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if len(k.Certificates) > 0 {
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expectedSHA1 := sha1.Sum(k.Certificates[0].Raw)
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expectedSHA256 := sha256.Sum256(k.Certificates[0].Raw)
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if len(k.CertificateThumbprintSHA1) > 0 && !bytes.Equal(k.CertificateThumbprintSHA1, expectedSHA1[:]) {
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return nil, errors.New("square/go-jose: invalid SHA-1 thumbprint, does not match cert chain")
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}
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if len(k.CertificateThumbprintSHA256) > 0 && !bytes.Equal(k.CertificateThumbprintSHA256, expectedSHA256[:]) {
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return nil, errors.New("square/go-jose: invalid or SHA-256 thumbprint, does not match cert chain")
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}
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}
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raw.X5u = k.CertificatesURL
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return json.Marshal(raw)
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}
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// UnmarshalJSON reads a key from its JSON representation.
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func (k *JSONWebKey) UnmarshalJSON(data []byte) (err error) {
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var raw rawJSONWebKey
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err = json.Unmarshal(data, &raw)
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if err != nil {
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return err
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}
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certs, err := parseCertificateChain(raw.X5c)
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if err != nil {
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return fmt.Errorf("square/go-jose: failed to unmarshal x5c field: %s", err)
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}
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var key interface{}
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var certPub interface{}
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var keyPub interface{}
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if len(certs) > 0 {
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// We need to check that leaf public key matches the key embedded in this
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// JWK, as required by the standard (see RFC 7517, Section 4.7). Otherwise
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// the JWK parsed could be semantically invalid. Technically, should also
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// check key usage fields and other extensions on the cert here, but the
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// standard doesn't exactly explain how they're supposed to map from the
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// JWK representation to the X.509 extensions.
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certPub = certs[0].PublicKey
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}
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switch raw.Kty {
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case "EC":
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if raw.D != nil {
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key, err = raw.ecPrivateKey()
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if err == nil {
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keyPub = key.(*ecdsa.PrivateKey).Public()
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}
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} else {
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key, err = raw.ecPublicKey()
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keyPub = key
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}
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case "RSA":
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if raw.D != nil {
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key, err = raw.rsaPrivateKey()
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if err == nil {
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keyPub = key.(*rsa.PrivateKey).Public()
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}
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} else {
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key, err = raw.rsaPublicKey()
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keyPub = key
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}
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case "oct":
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if certPub != nil {
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return errors.New("square/go-jose: invalid JWK, found 'oct' (symmetric) key with cert chain")
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}
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key, err = raw.symmetricKey()
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case "OKP":
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if raw.Crv == "Ed25519" && raw.X != nil {
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if raw.D != nil {
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key, err = raw.edPrivateKey()
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if err == nil {
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keyPub = key.(ed25519.PrivateKey).Public()
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}
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} else {
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key, err = raw.edPublicKey()
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keyPub = key
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}
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} else {
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err = fmt.Errorf("square/go-jose: unknown curve %s'", raw.Crv)
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}
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default:
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err = fmt.Errorf("square/go-jose: unknown json web key type '%s'", raw.Kty)
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}
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if err != nil {
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return
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}
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if certPub != nil && keyPub != nil {
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if !reflect.DeepEqual(certPub, keyPub) {
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return errors.New("square/go-jose: invalid JWK, public keys in key and x5c fields to not match")
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}
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}
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*k = JSONWebKey{Key: key, KeyID: raw.Kid, Algorithm: raw.Alg, Use: raw.Use, Certificates: certs}
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k.CertificatesURL = raw.X5u
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// x5t parameters are base64url-encoded SHA thumbprints
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// See RFC 7517, Section 4.8, https://tools.ietf.org/html/rfc7517#section-4.8
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x5tSHA1bytes, err := base64.RawURLEncoding.DecodeString(raw.X5tSHA1)
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if err != nil {
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return errors.New("square/go-jose: invalid JWK, x5t header has invalid encoding")
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}
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// RFC 7517, Section 4.8 is ambiguous as to whether the digest output should be byte or hex,
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// for this reason, after base64 decoding, if the size is sha1.Size it's likely that the value is a byte encoded
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// checksum so we skip this. Otherwise if the checksum was hex encoded we expect a 40 byte sized array so we'll
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// try to hex decode it. When Marshalling this value we'll always use a base64 encoded version of byte format checksum.
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if len(x5tSHA1bytes) == 2*sha1.Size {
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hx, err := hex.DecodeString(string(x5tSHA1bytes))
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if err != nil {
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return fmt.Errorf("square/go-jose: invalid JWK, unable to hex decode x5t: %v", err)
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}
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x5tSHA1bytes = hx
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}
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k.CertificateThumbprintSHA1 = x5tSHA1bytes
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x5tSHA256bytes, err := base64.RawURLEncoding.DecodeString(raw.X5tSHA256)
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if err != nil {
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return errors.New("square/go-jose: invalid JWK, x5t#S256 header has invalid encoding")
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}
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if len(x5tSHA256bytes) == 2*sha256.Size {
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hx256, err := hex.DecodeString(string(x5tSHA256bytes))
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if err != nil {
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return fmt.Errorf("square/go-jose: invalid JWK, unable to hex decode x5t#S256: %v", err)
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}
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x5tSHA256bytes = hx256
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}
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k.CertificateThumbprintSHA256 = x5tSHA256bytes
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x5tSHA1Len := len(k.CertificateThumbprintSHA1)
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x5tSHA256Len := len(k.CertificateThumbprintSHA256)
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if x5tSHA1Len > 0 && x5tSHA1Len != sha1.Size {
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return errors.New("square/go-jose: invalid JWK, x5t header is of incorrect size")
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}
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if x5tSHA256Len > 0 && x5tSHA256Len != sha256.Size {
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return errors.New("square/go-jose: invalid JWK, x5t#S256 header is of incorrect size")
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}
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// If certificate chain *and* thumbprints are set, verify correctness.
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if len(k.Certificates) > 0 {
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leaf := k.Certificates[0]
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sha1sum := sha1.Sum(leaf.Raw)
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sha256sum := sha256.Sum256(leaf.Raw)
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if len(k.CertificateThumbprintSHA1) > 0 && !bytes.Equal(sha1sum[:], k.CertificateThumbprintSHA1) {
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return errors.New("square/go-jose: invalid JWK, x5c thumbprint does not match x5t value")
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}
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if len(k.CertificateThumbprintSHA256) > 0 && !bytes.Equal(sha256sum[:], k.CertificateThumbprintSHA256) {
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return errors.New("square/go-jose: invalid JWK, x5c thumbprint does not match x5t#S256 value")
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}
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}
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return
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}
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// JSONWebKeySet represents a JWK Set object.
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type JSONWebKeySet struct {
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Keys []JSONWebKey `json:"keys"`
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}
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// Key convenience method returns keys by key ID. Specification states
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// that a JWK Set "SHOULD" use distinct key IDs, but allows for some
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// cases where they are not distinct. Hence method returns a slice
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// of JSONWebKeys.
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func (s *JSONWebKeySet) Key(kid string) []JSONWebKey {
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var keys []JSONWebKey
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for _, key := range s.Keys {
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if key.KeyID == kid {
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keys = append(keys, key)
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}
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}
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return keys
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}
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const rsaThumbprintTemplate = `{"e":"%s","kty":"RSA","n":"%s"}`
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const ecThumbprintTemplate = `{"crv":"%s","kty":"EC","x":"%s","y":"%s"}`
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const edThumbprintTemplate = `{"crv":"%s","kty":"OKP",x":"%s"}`
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func ecThumbprintInput(curve elliptic.Curve, x, y *big.Int) (string, error) {
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coordLength := curveSize(curve)
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crv, err := curveName(curve)
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if err != nil {
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return "", err
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}
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if len(x.Bytes()) > coordLength || len(y.Bytes()) > coordLength {
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return "", errors.New("square/go-jose: invalid elliptic key (too large)")
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}
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return fmt.Sprintf(ecThumbprintTemplate, crv,
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newFixedSizeBuffer(x.Bytes(), coordLength).base64(),
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newFixedSizeBuffer(y.Bytes(), coordLength).base64()), nil
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}
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func rsaThumbprintInput(n *big.Int, e int) (string, error) {
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return fmt.Sprintf(rsaThumbprintTemplate,
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newBufferFromInt(uint64(e)).base64(),
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newBuffer(n.Bytes()).base64()), nil
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}
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func edThumbprintInput(ed ed25519.PublicKey) (string, error) {
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crv := "Ed25519"
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if len(ed) > 32 {
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return "", errors.New("square/go-jose: invalid elliptic key (too large)")
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}
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return fmt.Sprintf(edThumbprintTemplate, crv,
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newFixedSizeBuffer(ed, 32).base64()), nil
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}
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// Thumbprint computes the JWK Thumbprint of a key using the
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// indicated hash algorithm.
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func (k *JSONWebKey) Thumbprint(hash crypto.Hash) ([]byte, error) {
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var input string
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var err error
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switch key := k.Key.(type) {
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case ed25519.PublicKey:
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input, err = edThumbprintInput(key)
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case *ecdsa.PublicKey:
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input, err = ecThumbprintInput(key.Curve, key.X, key.Y)
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case *ecdsa.PrivateKey:
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input, err = ecThumbprintInput(key.Curve, key.X, key.Y)
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case *rsa.PublicKey:
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input, err = rsaThumbprintInput(key.N, key.E)
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case *rsa.PrivateKey:
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input, err = rsaThumbprintInput(key.N, key.E)
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case ed25519.PrivateKey:
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input, err = edThumbprintInput(ed25519.PublicKey(key[32:]))
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default:
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return nil, fmt.Errorf("square/go-jose: unknown key type '%s'", reflect.TypeOf(key))
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}
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if err != nil {
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return nil, err
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}
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h := hash.New()
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h.Write([]byte(input))
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return h.Sum(nil), nil
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}
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// IsPublic returns true if the JWK represents a public key (not symmetric, not private).
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func (k *JSONWebKey) IsPublic() bool {
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switch k.Key.(type) {
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case *ecdsa.PublicKey, *rsa.PublicKey, ed25519.PublicKey:
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return true
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default:
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return false
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}
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}
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// Public creates JSONWebKey with corresponding publik key if JWK represents asymmetric private key.
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func (k *JSONWebKey) Public() JSONWebKey {
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if k.IsPublic() {
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return *k
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}
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ret := *k
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switch key := k.Key.(type) {
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case *ecdsa.PrivateKey:
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ret.Key = key.Public()
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case *rsa.PrivateKey:
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ret.Key = key.Public()
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case ed25519.PrivateKey:
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ret.Key = key.Public()
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default:
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return JSONWebKey{} // returning invalid key
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}
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return ret
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}
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// Valid checks that the key contains the expected parameters.
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func (k *JSONWebKey) Valid() bool {
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if k.Key == nil {
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return false
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}
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switch key := k.Key.(type) {
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case *ecdsa.PublicKey:
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if key.Curve == nil || key.X == nil || key.Y == nil {
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return false
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}
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case *ecdsa.PrivateKey:
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if key.Curve == nil || key.X == nil || key.Y == nil || key.D == nil {
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return false
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}
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case *rsa.PublicKey:
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if key.N == nil || key.E == 0 {
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return false
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}
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case *rsa.PrivateKey:
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if key.N == nil || key.E == 0 || key.D == nil || len(key.Primes) < 2 {
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return false
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}
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case ed25519.PublicKey:
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if len(key) != 32 {
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return false
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}
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case ed25519.PrivateKey:
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if len(key) != 64 {
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return false
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}
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default:
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return false
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}
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return true
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}
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func (key rawJSONWebKey) rsaPublicKey() (*rsa.PublicKey, error) {
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if key.N == nil || key.E == nil {
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return nil, fmt.Errorf("square/go-jose: invalid RSA key, missing n/e values")
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}
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return &rsa.PublicKey{
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N: key.N.bigInt(),
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E: key.E.toInt(),
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}, nil
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}
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func fromEdPublicKey(pub ed25519.PublicKey) *rawJSONWebKey {
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return &rawJSONWebKey{
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Kty: "OKP",
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Crv: "Ed25519",
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X: newBuffer(pub),
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}
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}
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func fromRsaPublicKey(pub *rsa.PublicKey) *rawJSONWebKey {
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return &rawJSONWebKey{
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Kty: "RSA",
|
|
N: newBuffer(pub.N.Bytes()),
|
|
E: newBufferFromInt(uint64(pub.E)),
|
|
}
|
|
}
|
|
|
|
func (key rawJSONWebKey) ecPublicKey() (*ecdsa.PublicKey, error) {
|
|
var curve elliptic.Curve
|
|
switch key.Crv {
|
|
case "P-256":
|
|
curve = elliptic.P256()
|
|
case "P-384":
|
|
curve = elliptic.P384()
|
|
case "P-521":
|
|
curve = elliptic.P521()
|
|
default:
|
|
return nil, fmt.Errorf("square/go-jose: unsupported elliptic curve '%s'", key.Crv)
|
|
}
|
|
|
|
if key.X == nil || key.Y == nil {
|
|
return nil, errors.New("square/go-jose: invalid EC key, missing x/y values")
|
|
}
|
|
|
|
// The length of this octet string MUST be the full size of a coordinate for
|
|
// the curve specified in the "crv" parameter.
|
|
// https://tools.ietf.org/html/rfc7518#section-6.2.1.2
|
|
if curveSize(curve) != len(key.X.data) {
|
|
return nil, fmt.Errorf("square/go-jose: invalid EC public key, wrong length for x")
|
|
}
|
|
|
|
if curveSize(curve) != len(key.Y.data) {
|
|
return nil, fmt.Errorf("square/go-jose: invalid EC public key, wrong length for y")
|
|
}
|
|
|
|
x := key.X.bigInt()
|
|
y := key.Y.bigInt()
|
|
|
|
if !curve.IsOnCurve(x, y) {
|
|
return nil, errors.New("square/go-jose: invalid EC key, X/Y are not on declared curve")
|
|
}
|
|
|
|
return &ecdsa.PublicKey{
|
|
Curve: curve,
|
|
X: x,
|
|
Y: y,
|
|
}, nil
|
|
}
|
|
|
|
func fromEcPublicKey(pub *ecdsa.PublicKey) (*rawJSONWebKey, error) {
|
|
if pub == nil || pub.X == nil || pub.Y == nil {
|
|
return nil, fmt.Errorf("square/go-jose: invalid EC key (nil, or X/Y missing)")
|
|
}
|
|
|
|
name, err := curveName(pub.Curve)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
size := curveSize(pub.Curve)
|
|
|
|
xBytes := pub.X.Bytes()
|
|
yBytes := pub.Y.Bytes()
|
|
|
|
if len(xBytes) > size || len(yBytes) > size {
|
|
return nil, fmt.Errorf("square/go-jose: invalid EC key (X/Y too large)")
|
|
}
|
|
|
|
key := &rawJSONWebKey{
|
|
Kty: "EC",
|
|
Crv: name,
|
|
X: newFixedSizeBuffer(xBytes, size),
|
|
Y: newFixedSizeBuffer(yBytes, size),
|
|
}
|
|
|
|
return key, nil
|
|
}
|
|
|
|
func (key rawJSONWebKey) edPrivateKey() (ed25519.PrivateKey, error) {
|
|
var missing []string
|
|
switch {
|
|
case key.D == nil:
|
|
missing = append(missing, "D")
|
|
case key.X == nil:
|
|
missing = append(missing, "X")
|
|
}
|
|
|
|
if len(missing) > 0 {
|
|
return nil, fmt.Errorf("square/go-jose: invalid Ed25519 private key, missing %s value(s)", strings.Join(missing, ", "))
|
|
}
|
|
|
|
privateKey := make([]byte, ed25519.PrivateKeySize)
|
|
copy(privateKey[0:32], key.D.bytes())
|
|
copy(privateKey[32:], key.X.bytes())
|
|
rv := ed25519.PrivateKey(privateKey)
|
|
return rv, nil
|
|
}
|
|
|
|
func (key rawJSONWebKey) edPublicKey() (ed25519.PublicKey, error) {
|
|
if key.X == nil {
|
|
return nil, fmt.Errorf("square/go-jose: invalid Ed key, missing x value")
|
|
}
|
|
publicKey := make([]byte, ed25519.PublicKeySize)
|
|
copy(publicKey[0:32], key.X.bytes())
|
|
rv := ed25519.PublicKey(publicKey)
|
|
return rv, nil
|
|
}
|
|
|
|
func (key rawJSONWebKey) rsaPrivateKey() (*rsa.PrivateKey, error) {
|
|
var missing []string
|
|
switch {
|
|
case key.N == nil:
|
|
missing = append(missing, "N")
|
|
case key.E == nil:
|
|
missing = append(missing, "E")
|
|
case key.D == nil:
|
|
missing = append(missing, "D")
|
|
case key.P == nil:
|
|
missing = append(missing, "P")
|
|
case key.Q == nil:
|
|
missing = append(missing, "Q")
|
|
}
|
|
|
|
if len(missing) > 0 {
|
|
return nil, fmt.Errorf("square/go-jose: invalid RSA private key, missing %s value(s)", strings.Join(missing, ", "))
|
|
}
|
|
|
|
rv := &rsa.PrivateKey{
|
|
PublicKey: rsa.PublicKey{
|
|
N: key.N.bigInt(),
|
|
E: key.E.toInt(),
|
|
},
|
|
D: key.D.bigInt(),
|
|
Primes: []*big.Int{
|
|
key.P.bigInt(),
|
|
key.Q.bigInt(),
|
|
},
|
|
}
|
|
|
|
if key.Dp != nil {
|
|
rv.Precomputed.Dp = key.Dp.bigInt()
|
|
}
|
|
if key.Dq != nil {
|
|
rv.Precomputed.Dq = key.Dq.bigInt()
|
|
}
|
|
if key.Qi != nil {
|
|
rv.Precomputed.Qinv = key.Qi.bigInt()
|
|
}
|
|
|
|
err := rv.Validate()
|
|
return rv, err
|
|
}
|
|
|
|
func fromEdPrivateKey(ed ed25519.PrivateKey) (*rawJSONWebKey, error) {
|
|
raw := fromEdPublicKey(ed25519.PublicKey(ed[32:]))
|
|
|
|
raw.D = newBuffer(ed[0:32])
|
|
return raw, nil
|
|
}
|
|
|
|
func fromRsaPrivateKey(rsa *rsa.PrivateKey) (*rawJSONWebKey, error) {
|
|
if len(rsa.Primes) != 2 {
|
|
return nil, ErrUnsupportedKeyType
|
|
}
|
|
|
|
raw := fromRsaPublicKey(&rsa.PublicKey)
|
|
|
|
raw.D = newBuffer(rsa.D.Bytes())
|
|
raw.P = newBuffer(rsa.Primes[0].Bytes())
|
|
raw.Q = newBuffer(rsa.Primes[1].Bytes())
|
|
|
|
if rsa.Precomputed.Dp != nil {
|
|
raw.Dp = newBuffer(rsa.Precomputed.Dp.Bytes())
|
|
}
|
|
if rsa.Precomputed.Dq != nil {
|
|
raw.Dq = newBuffer(rsa.Precomputed.Dq.Bytes())
|
|
}
|
|
if rsa.Precomputed.Qinv != nil {
|
|
raw.Qi = newBuffer(rsa.Precomputed.Qinv.Bytes())
|
|
}
|
|
|
|
return raw, nil
|
|
}
|
|
|
|
func (key rawJSONWebKey) ecPrivateKey() (*ecdsa.PrivateKey, error) {
|
|
var curve elliptic.Curve
|
|
switch key.Crv {
|
|
case "P-256":
|
|
curve = elliptic.P256()
|
|
case "P-384":
|
|
curve = elliptic.P384()
|
|
case "P-521":
|
|
curve = elliptic.P521()
|
|
default:
|
|
return nil, fmt.Errorf("square/go-jose: unsupported elliptic curve '%s'", key.Crv)
|
|
}
|
|
|
|
if key.X == nil || key.Y == nil || key.D == nil {
|
|
return nil, fmt.Errorf("square/go-jose: invalid EC private key, missing x/y/d values")
|
|
}
|
|
|
|
// The length of this octet string MUST be the full size of a coordinate for
|
|
// the curve specified in the "crv" parameter.
|
|
// https://tools.ietf.org/html/rfc7518#section-6.2.1.2
|
|
if curveSize(curve) != len(key.X.data) {
|
|
return nil, fmt.Errorf("square/go-jose: invalid EC private key, wrong length for x")
|
|
}
|
|
|
|
if curveSize(curve) != len(key.Y.data) {
|
|
return nil, fmt.Errorf("square/go-jose: invalid EC private key, wrong length for y")
|
|
}
|
|
|
|
// https://tools.ietf.org/html/rfc7518#section-6.2.2.1
|
|
if dSize(curve) != len(key.D.data) {
|
|
return nil, fmt.Errorf("square/go-jose: invalid EC private key, wrong length for d")
|
|
}
|
|
|
|
x := key.X.bigInt()
|
|
y := key.Y.bigInt()
|
|
|
|
if !curve.IsOnCurve(x, y) {
|
|
return nil, errors.New("square/go-jose: invalid EC key, X/Y are not on declared curve")
|
|
}
|
|
|
|
return &ecdsa.PrivateKey{
|
|
PublicKey: ecdsa.PublicKey{
|
|
Curve: curve,
|
|
X: x,
|
|
Y: y,
|
|
},
|
|
D: key.D.bigInt(),
|
|
}, nil
|
|
}
|
|
|
|
func fromEcPrivateKey(ec *ecdsa.PrivateKey) (*rawJSONWebKey, error) {
|
|
raw, err := fromEcPublicKey(&ec.PublicKey)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if ec.D == nil {
|
|
return nil, fmt.Errorf("square/go-jose: invalid EC private key")
|
|
}
|
|
|
|
raw.D = newFixedSizeBuffer(ec.D.Bytes(), dSize(ec.PublicKey.Curve))
|
|
|
|
return raw, nil
|
|
}
|
|
|
|
// dSize returns the size in octets for the "d" member of an elliptic curve
|
|
// private key.
|
|
// The length of this octet string MUST be ceiling(log-base-2(n)/8)
|
|
// octets (where n is the order of the curve).
|
|
// https://tools.ietf.org/html/rfc7518#section-6.2.2.1
|
|
func dSize(curve elliptic.Curve) int {
|
|
order := curve.Params().P
|
|
bitLen := order.BitLen()
|
|
size := bitLen / 8
|
|
if bitLen%8 != 0 {
|
|
size = size + 1
|
|
}
|
|
return size
|
|
}
|
|
|
|
func fromSymmetricKey(key []byte) (*rawJSONWebKey, error) {
|
|
return &rawJSONWebKey{
|
|
Kty: "oct",
|
|
K: newBuffer(key),
|
|
}, nil
|
|
}
|
|
|
|
func (key rawJSONWebKey) symmetricKey() ([]byte, error) {
|
|
if key.K == nil {
|
|
return nil, fmt.Errorf("square/go-jose: invalid OCT (symmetric) key, missing k value")
|
|
}
|
|
return key.K.bytes(), nil
|
|
}
|