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entry.go
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entry.go
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package keystore
import (
"crypto"
"crypto/x509"
"fmt"
"gopkg.in/square/go-jose.v2"
)
const (
rsa2048 = 2048
rsa3072 = 3072
rsa4096 = 4096
ecdsa256 = 256
ecdsa384 = 384
ecdsa512 = 521
)
type Entry struct {
KeyID string
Alg string
KeySize int
PrivateKey crypto.Signer
CertChain []*x509.Certificate
}
func (e *Entry) JWK() jose.JSONWebKey {
return jose.JSONWebKey{
KeyID: e.KeyID,
Algorithm: string(e.JOSEAlgorithm()),
Key: e.PrivateKey.Public(),
Use: "sig",
Certificates: e.CertChain,
}
}
func (e *Entry) JOSEAlgorithm() jose.SignatureAlgorithm {
switch e.Alg {
case AlgRSA:
return getRSAAlgorithm(e.KeySize)
case AlgECDSA:
return getECDSAAlgorithm(e.KeySize)
default:
panic(fmt.Sprintf("Unsupported algorithm: %s", e.Alg))
}
}
func getECDSAAlgorithm(keySize int) jose.SignatureAlgorithm {
switch keySize {
case ecdsa256:
return jose.ES256
case ecdsa384:
return jose.ES384
case ecdsa512:
return jose.ES512
default:
panic(fmt.Sprintf("unsupported ECDSA key size: %d", keySize))
}
}
func getRSAAlgorithm(keySize int) jose.SignatureAlgorithm {
switch keySize {
case rsa2048:
return jose.PS256
case rsa3072:
return jose.PS384
case rsa4096:
return jose.PS512
default:
panic(fmt.Sprintf("unsupported RSA key size: %d", keySize))
}
}