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Implementation import/export JWK implementation
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| package webcrypto | ||
|
|
||
| import ( | ||
| "encoding/base64" | ||
| "encoding/json" | ||
| "errors" | ||
| "fmt" | ||
| ) | ||
|
|
||
| // JWK represents a JSON Web Key (JWK) key. | ||
| type JWK map[string]interface{} | ||
|
|
||
| // Set sets a key-value pair in the JWK. | ||
| func (jwk *JWK) Set(key string, value interface{}) { | ||
| (*jwk)[key] = value | ||
| } | ||
|
|
||
| // ExtractSymmetricJWK extracts the symmetric key from a given JWK key (JSON data). | ||
| func ExtractSymmetricJWK(jsonKeyData []byte) ([]byte, error) { | ||
| var key JWK | ||
| err := json.Unmarshal(jsonKeyData, &key) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to parse JWK key: %w", err) | ||
| } | ||
|
|
||
| k, ok := key["k"] | ||
| if !ok || k == "" { | ||
| return nil, errors.New("invalid JWK key") | ||
| } | ||
|
|
||
| kv, ok := k.(string) | ||
| if !ok { | ||
| return nil, errors.New("invalid JWK key") | ||
| } | ||
|
|
||
| return base64.RawStdEncoding.DecodeString(kv) | ||
| } | ||
|
|
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| // ExportSymmetricJWK exports a symmetric key as a map of JWK key parameters. | ||
| func ExportSymmetricJWK(key *CryptoKey) (*JWK, error) { | ||
| // currently, handle is key in the form of a byte slice | ||
| rawKey, ok := key.handle.([]byte) | ||
| if !ok { | ||
| return nil, errors.New("key's handle isn't a byte slice") | ||
| } | ||
|
|
||
| exported := &JWK{ | ||
| "kty": "oct", | ||
| "key_ops": key.Usages, | ||
| "ext": key.Extractable, | ||
| "k": base64.RawStdEncoding.EncodeToString(rawKey), | ||
| } | ||
|
|
||
| switch alg := key.Algorithm.(type) { | ||
| case hashAlgorithm: | ||
| exported.Set("alg", fmt.Sprintf("HS"+alg.hash()[4:])) | ||
| case namedAlgorithm: | ||
| exported.Set("alg", fmt.Sprintf("A%d%s", (8*len(rawKey)), alg.alg()[4:])) | ||
| default: | ||
| return nil, errors.New("unsupported algorithm") | ||
| } | ||
|
|
||
| return exported, nil | ||
| } |
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