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// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build boringcrypto
package x509
import (
"crypto/ecdsa"
"crypto/elliptic"
"crypto/internal/boring/fipstls"
"crypto/rsa"
)
// boringAllowCert reports whether c is allowed to be used
// in a certificate chain by the current fipstls enforcement setting.
// It is called for each leaf, intermediate, and root certificate.
func boringAllowCert(c *Certificate) bool {
if !fipstls.Required() {
return true
}
// The key must be RSA 2048, RSA 3072, RSA 4096,
// or ECDSA P-256, P-384, P-521.
switch k := c.PublicKey.(type) {
default:
return false
case *rsa.PublicKey:
if size := k.N.BitLen(); size != 2048 && size != 3072 && size != 4096 {
return false
}
case *ecdsa.PublicKey:
if k.Curve != elliptic.P256() && k.Curve != elliptic.P384() && k.Curve != elliptic.P521() {
return false
}
}
return true
}
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