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keypair.go
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keypair.go
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package ca
import (
"crypto/ecdsa"
"crypto/ed25519"
"crypto/rsa"
"errors"
)
var (
UnknownPrivateKeyError = errors.New("unknown private key")
UnknownAlgorithmError = errors.New("unknown algorithm")
)
type KeyPair struct {
PublicKey any
PrivateKey any
}
type KeyPairGenerator interface {
GenerateKeyPair() (KeyPair, error)
}
type keyPairGenerator struct {
generate generator
opts KeyOptions
}
type generator func(opts KeyOptions) (any, error)
var generateList = map[string]generator{
"ECDSA": func(opts KeyOptions) (any, error) {
return ecdsa.GenerateKey(opts.Curve, opts.Random)
},
"RSA": func(opts KeyOptions) (any, error) {
return rsa.GenerateKey(opts.Random, opts.KeySize)
},
"ED25591": func(opts KeyOptions) (any, error) {
_, priv, err := ed25519.GenerateKey(opts.Random)
return priv, err
},
}
func (kpg *keyPairGenerator) GenerateKeyPair() (KeyPair, error) {
privateKey, err := kpg.generate(kpg.opts)
if err != nil {
return KeyPair{}, err
}
return NewKeyPair(privateKey)
}
func NewKeyPair(privateKey any) (KeyPair, error) {
var kp KeyPair
var publicKey any
switch k := privateKey.(type) {
case *rsa.PrivateKey:
publicKey = &k.PublicKey
case *ecdsa.PrivateKey:
publicKey = &k.PublicKey
case ed25519.PrivateKey:
publicKey = k.Public().(ed25519.PublicKey)
default:
return kp, UnknownPrivateKeyError
}
kp.PublicKey = publicKey
kp.PrivateKey = privateKey
return kp, nil
}