71 lines
1.7 KiB
Go
71 lines
1.7 KiB
Go
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package xkeypairs
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import (
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"crypto/ecdsa"
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"crypto/rsa"
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"encoding/base64"
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"errors"
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"fmt"
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"math/big"
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"git.rootprojects.org/root/keypairs"
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)
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type JWK interface {
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marshalJWK() ([]byte, error)
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}
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type ECJWK struct {
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KeyID string `json:"kid,omitempty"`
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Curve string `json:"crv"`
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X string `json:"x"`
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Y string `json:"y"`
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Use []string `json:"use,omitempty"`
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Seed string `json:"_seed,omitempty"`
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}
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func (k *ECJWK) marshalJWK() ([]byte, error) {
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return []byte(fmt.Sprintf(`{"crv":%q,"kty":"EC","x":%q,"y":%q}`, k.Curve, k.X, k.Y)), nil
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}
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type RSAJWK struct {
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KeyID string `json:"kid,omitempty"`
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Exp string `json:"e"`
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N string `json"n"`
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Use []string `json:"use,omitempty"`
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Seed string `json:"_seed,omitempty"`
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}
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func (k *RSAJWK) marshalJWK() ([]byte, error) {
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return []byte(fmt.Sprintf(`{"e":%q,"kty":"RSA","n":%q}`, k.Exp, k.N)), nil
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}
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func ToPublicJWK(pubkey keypairs.PublicKey) JWK {
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switch k := pubkey.Key().(type) {
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case *ecdsa.PublicKey:
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return ECToPublicJWK(k)
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case *rsa.PublicKey:
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return RSAToPublicJWK(k)
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default:
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panic(errors.New("impossible key type"))
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return nil
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}
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}
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// ECToPublicJWK will output the most minimal version of an EC JWK (no key id, no "use" flag, nada)
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func ECToPublicJWK(k *ecdsa.PublicKey) *ECJWK {
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return &ECJWK{
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Curve: k.Curve.Params().Name,
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X: base64.RawURLEncoding.EncodeToString(k.X.Bytes()),
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Y: base64.RawURLEncoding.EncodeToString(k.Y.Bytes()),
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}
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}
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// RSAToPublicJWK will output the most minimal version of an RSA JWK (no key id, no "use" flag, nada)
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func RSAToPublicJWK(p *rsa.PublicKey) *RSAJWK {
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return &RSAJWK{
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Exp: base64.RawURLEncoding.EncodeToString(big.NewInt(int64(p.E)).Bytes()),
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N: base64.RawURLEncoding.EncodeToString(p.N.Bytes()),
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}
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}
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