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@ -7,17 +7,31 @@ package acme
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import (
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import (
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"crypto"
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"crypto"
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"crypto/ecdsa"
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"crypto/ecdsa"
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"crypto/hmac"
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"crypto/rand"
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"crypto/rand"
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"crypto/rsa"
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"crypto/rsa"
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"crypto/sha256"
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"crypto/sha256"
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"crypto/sha512"
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_ "crypto/sha512" // need for EC keys
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_ "crypto/sha512" // need for EC keys
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"encoding/asn1"
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"encoding/asn1"
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"encoding/base64"
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"encoding/base64"
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"encoding/json"
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"encoding/json"
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"errors"
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"fmt"
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"fmt"
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"hash"
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"math/big"
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"math/big"
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)
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)
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// MACAlgorithm represents a JWS MAC signature algorithm.
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// See https://tools.ietf.org/html/rfc7518#section-3.1 for more details.
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type MACAlgorithm string
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const (
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MACAlgorithmHS256 = MACAlgorithm("HS256")
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MACAlgorithmHS384 = MACAlgorithm("HS384")
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MACAlgorithmHS512 = MACAlgorithm("HS512")
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)
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// keyID is the account identity provided by a CA during registration.
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// keyID is the account identity provided by a CA during registration.
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type keyID string
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type keyID string
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@ -31,6 +45,14 @@ const noKeyID = keyID("")
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// See https://tools.ietf.org/html/rfc8555#section-6.3 for more details.
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// See https://tools.ietf.org/html/rfc8555#section-6.3 for more details.
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const noPayload = ""
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const noPayload = ""
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// jsonWebSignature can be easily serialized into a JWS following
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// https://tools.ietf.org/html/rfc7515#section-3.2.
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type jsonWebSignature struct {
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Protected string `json:"protected"`
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Payload string `json:"payload"`
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Sig string `json:"signature"`
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}
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// jwsEncodeJSON signs claimset using provided key and a nonce.
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// jwsEncodeJSON signs claimset using provided key and a nonce.
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// The result is serialized in JSON format containing either kid or jwk
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// The result is serialized in JSON format containing either kid or jwk
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// fields based on the provided keyID value.
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// fields based on the provided keyID value.
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@ -71,12 +93,7 @@ func jwsEncodeJSON(claimset interface{}, key crypto.Signer, kid keyID, nonce, ur
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if err != nil {
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if err != nil {
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return nil, err
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return nil, err
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}
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}
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enc := jsonWebSignature{
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enc := struct {
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Protected string `json:"protected"`
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Payload string `json:"payload"`
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Sig string `json:"signature"`
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}{
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Protected: phead,
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Protected: phead,
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Payload: payload,
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Payload: payload,
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Sig: base64.RawURLEncoding.EncodeToString(sig),
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Sig: base64.RawURLEncoding.EncodeToString(sig),
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@ -84,6 +101,32 @@ func jwsEncodeJSON(claimset interface{}, key crypto.Signer, kid keyID, nonce, ur
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return json.Marshal(&enc)
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return json.Marshal(&enc)
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}
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}
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// jwsWithMAC creates and signs a JWS using the given key and algorithm.
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// "rawProtected" and "rawPayload" should not be base64-URL-encoded.
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func jwsWithMAC(key []byte, alg MACAlgorithm, rawProtected, rawPayload []byte) (*jsonWebSignature, error) {
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if len(key) == 0 {
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return nil, errors.New("acme: cannot sign JWS with an empty MAC key")
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}
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protected := base64.RawURLEncoding.EncodeToString(rawProtected)
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payload := base64.RawURLEncoding.EncodeToString(rawPayload)
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// Only HMACs are currently supported.
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hmac, err := newHMAC(key, alg)
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if err != nil {
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return nil, err
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}
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if _, err := hmac.Write([]byte(protected + "." + payload)); err != nil {
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return nil, err
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}
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mac := hmac.Sum(nil)
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return &jsonWebSignature{
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Protected: protected,
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Payload: payload,
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Sig: base64.RawURLEncoding.EncodeToString(mac),
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}, nil
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}
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// jwkEncode encodes public part of an RSA or ECDSA key into a JWK.
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// jwkEncode encodes public part of an RSA or ECDSA key into a JWK.
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// The result is also suitable for creating a JWK thumbprint.
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// The result is also suitable for creating a JWK thumbprint.
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// https://tools.ietf.org/html/rfc7517
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// https://tools.ietf.org/html/rfc7517
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@ -175,6 +218,20 @@ func jwsHasher(pub crypto.PublicKey) (string, crypto.Hash) {
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return "", 0
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return "", 0
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}
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}
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// newHMAC returns an appropriate HMAC for the given MACAlgorithm.
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func newHMAC(key []byte, alg MACAlgorithm) (hash.Hash, error) {
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switch alg {
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case MACAlgorithmHS256:
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return hmac.New(sha256.New, key), nil
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case MACAlgorithmHS384:
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return hmac.New(sha512.New384, key), nil
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case MACAlgorithmHS512:
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return hmac.New(sha512.New, key), nil
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default:
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return nil, fmt.Errorf("acme: unsupported MAC algorithm: %v", alg)
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}
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}
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// JWKThumbprint creates a JWK thumbprint out of pub
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// JWKThumbprint creates a JWK thumbprint out of pub
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// as specified in https://tools.ietf.org/html/rfc7638.
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// as specified in https://tools.ietf.org/html/rfc7638.
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func JWKThumbprint(pub crypto.PublicKey) (string, error) {
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func JWKThumbprint(pub crypto.PublicKey) (string, error) {
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techknowlogick
4 years ago
committed by
GitHub