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