84 lines
2.0 KiB
Go
84 lines
2.0 KiB
Go
package keypairs
|
|
|
|
import (
|
|
"crypto/ecdsa"
|
|
"crypto/elliptic"
|
|
"crypto/rand"
|
|
"crypto/rsa"
|
|
"io"
|
|
mathrand "math/rand"
|
|
"time"
|
|
)
|
|
|
|
var randReader io.Reader = rand.Reader
|
|
var maxRetry = 1
|
|
|
|
// KeyOptions are the things that we may need to know about a request to fulfill it properly
|
|
type keyOptions struct {
|
|
//Key string `json:"key"`
|
|
KeyType string `json:"kty"`
|
|
//Seed int64 `json:"-"`
|
|
//SeedStr string `json:"seed"`
|
|
//Claims Object `json:"claims"`
|
|
//Header Object `json:"header"`
|
|
}
|
|
|
|
// this shananigans is only for testing and debug API stuff
|
|
func (o *keyOptions) myFooNextReader() io.Reader {
|
|
return randReader
|
|
/*
|
|
if 0 == o.Seed {
|
|
return randReader
|
|
}
|
|
return mathrand.New(mathrand.NewSource(o.Seed))
|
|
*/
|
|
}
|
|
|
|
// NewDefaultPrivateKey generates a key with reasonable strength.
|
|
// Today that means a 256-bit equivalent - either RSA 2048 or EC P-256.
|
|
func NewDefaultPrivateKey() PrivateKey {
|
|
mathrand.Seed(time.Now().UnixNano())
|
|
coin := mathrand.Int()
|
|
if 0 == coin%2 {
|
|
return newPrivateKey(&keyOptions{
|
|
KeyType: "RSA",
|
|
})
|
|
}
|
|
return newPrivateKey(&keyOptions{
|
|
KeyType: "EC",
|
|
})
|
|
}
|
|
|
|
// newPrivateKey generates a 256-bit entropy RSA or ECDSA private key
|
|
func newPrivateKey(opts *keyOptions) PrivateKey {
|
|
var privkey PrivateKey
|
|
|
|
if "RSA" == opts.KeyType {
|
|
keylen := 2048
|
|
privkey, _ = rsa.GenerateKey(opts.myFooNextReader(), keylen)
|
|
/*
|
|
if 0 != opts.Seed {
|
|
for i := 0; i < maxRetry; i++ {
|
|
otherkey, _ := rsa.GenerateKey(opts.myFooNextReader(), keylen)
|
|
otherCmp := otherkey.D.Cmp(privkey.(*rsa.PrivateKey).D)
|
|
if 0 != otherCmp {
|
|
// There are two possible keys, choose the lesser D value
|
|
// See https://github.com/square/go-jose/issues/189
|
|
if otherCmp < 0 {
|
|
privkey = otherkey
|
|
}
|
|
break
|
|
}
|
|
if maxRetry == i-1 {
|
|
log.Printf("error: coinflip landed on heads %d times", maxRetry)
|
|
}
|
|
}
|
|
}
|
|
*/
|
|
} else {
|
|
// TODO: EC keys may also suffer the same random problems in the future
|
|
privkey, _ = ecdsa.GenerateKey(elliptic.P256(), opts.myFooNextReader())
|
|
}
|
|
return privkey
|
|
}
|