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generator_rs256.go
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/
generator_rs256.go
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package jwk
import (
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"fmt"
"github.com/pkg/errors"
"github.com/square/go-jose"
)
type RS256Generator struct {
KeyLength int
}
func (g *RS256Generator) Generate(id string) (*jose.JSONWebKeySet, error) {
if g.KeyLength < 4096 {
g.KeyLength = 4096
}
key, err := rsa.GenerateKey(rand.Reader, g.KeyLength)
if err != nil {
return nil, errors.Errorf("Could not generate key because %s", err)
} else if err = key.Validate(); err != nil {
return nil, errors.Errorf("Validation failed because %s", err)
}
// jose does not support this...
key.Precomputed = rsa.PrecomputedValues{}
return &jose.JSONWebKeySet{
Keys: []jose.JSONWebKey{
{
Key: key,
KeyID: ider("private", id),
Certificates: []*x509.Certificate{},
},
{
Key: &key.PublicKey,
KeyID: ider("public", id),
Certificates: []*x509.Certificate{},
},
},
}, nil
}
func ider(typ, id string) string {
if id != "" {
return fmt.Sprintf("%s:%s", typ, id)
}
return typ
}