crypto/x509: reduce boring test key size

Generating 8192 bit keys times out on builders relatively frequently. We
just need something that isn't a boringAllowCert allowed key size so we
can test that a non-boringAllowCert signed intermediate works, so just
use 512 instead since it'll be significantly faster.

Fixes #56798

Change-Id: I416e0d8c3aa11ff44e9870755efa95c74d1013f1
Reviewed-on: https://go-review.googlesource.com/c/go/+/451656
Auto-Submit: Roland Shoemaker <[email protected]>
Reviewed-by: Filippo Valsorda <[email protected]>
Run-TryBot: Roland Shoemaker <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>
Reviewed-by: Bryan Mills <[email protected]>

Author: rolandshoemaker

src/crypto/x509/boring_test.go

@@ -54,7 +54,7 @@ type boringCertificate struct {
 
 func TestBoringAllowCert(t *testing.T) {
 	R1 := testBoringCert(t, "R1", boringRSAKey(t, 2048), nil, boringCertCA|boringCertFIPSOK)
-	R2 := testBoringCert(t, "R2", boringRSAKey(t, 8192), nil, boringCertCA)
+	R2 := testBoringCert(t, "R2", boringRSAKey(t, 512), nil, boringCertCA)
 	R3 := testBoringCert(t, "R3", boringRSAKey(t, 4096), nil, boringCertCA|boringCertFIPSOK)
 
 	M1_R1 := testBoringCert(t, "M1_R1", boringECDSAKey(t, elliptic.P256()), R1, boringCertCA|boringCertFIPSOK)