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@ -7,17 +7,31 @@ package acme |
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import ( |
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"crypto" |
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"crypto/ecdsa" |
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"crypto/hmac" |
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"crypto/rand" |
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"crypto/rsa" |
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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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"encoding/asn1" |
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"encoding/base64" |
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"encoding/json" |
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"errors" |
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"fmt" |
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"hash" |
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"math/big" |
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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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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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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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// 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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@ -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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return nil, err |
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} |
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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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enc := jsonWebSignature{ |
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Protected: phead, |
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Payload: payload, |
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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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} |
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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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// The result is also suitable for creating a JWK thumbprint.
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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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} |
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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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// as specified in https://tools.ietf.org/html/rfc7638.
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func JWKThumbprint(pub crypto.PublicKey) (string, error) { |
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techknowlogick
4 years ago
committed by
GitHub