48 lines
877 B
Go
48 lines
877 B
Go
package publickey
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import (
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"bytes"
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"encoding/base64"
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"encoding/json"
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"fmt"
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"golang.org/x/crypto/ed25519"
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)
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type EdDSAPublicKeyHeader struct {
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Curve string `json:"crv"`
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X string `json:"x"`
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}
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func ParseEdDSAPublicKey(data json.RawMessage) (*ed25519.PublicKey, error) {
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var header EdDSAPublicKeyHeader
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r := bytes.NewReader(data)
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dec := json.NewDecoder(r)
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err := dec.Decode(&header)
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if err != nil {
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return nil, err
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}
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if header.Curve != "Ed25519" {
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return nil, fmt.Errorf("Invalid/Unsupported curve type %s", header.Curve)
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}
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if header.X == "" {
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return nil, fmt.Errorf("Non-existent curve point")
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}
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rawKey, err := base64.RawURLEncoding.DecodeString(header.X)
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if err != nil {
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return nil, err
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}
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if len(rawKey) != ed25519.PublicKeySize {
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return nil, fmt.Errorf("Invalid public key")
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}
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key := ed25519.PublicKey(rawKey)
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return &key, nil
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}
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