Add p256+sha384 test cert

Test signature validation against a fake cert chain
whose intermediate certificate signs the leaf with a
p256 key using sha384. Generated using openssl.

PiperOrigin-RevId: 944011042
Change-Id: I93a349fda01615cab043566295a48be4888c9352

Author: suzannajiwani

src/test/kotlin/provider/KeyAttestationCertPathValidatorTest.kt

@@ -260,6 +260,15 @@ class KeyAttestationCertPathValidatorTest {
     assertThat(exception.reason).isEqualTo(BasicReason.EXPIRED)
   }
 
+  @Test
+  fun p256Sha384Intermediate_succeeds() {
+    val certPath = readCertPath("p256_sha384_intermediate.pem")
+    val root = certPath.certificatesWithAnchor.last()
+    val params =
+      PKIXParameters(setOf(TrustAnchor(root, null))).apply { date = FakeCalendar.DEFAULT.today() }
+    certPathValidator.validate(certPath, params)
+  }
+
   @Test
   fun forgedKeybox_throwsCertPathValidatorException() {
     val certPath = Chains.forgedKeybox

testdata/p256_sha384_intermediate.pem

@@ -0,0 +1,32 @@
+-----BEGIN CERTIFICATE-----
+MIIBdzCCAR2gAwIBAgIBAjAKBggqhkjOPQQDAzAcMRowGAYDVQQDDBFUZXN0IElu
+dGVybWVkaWF0ZTAeFw0yNDAxMDEwMDAwMDBaFw0zNDAxMDEwMDAwMDBaMBQxEjAQ
+BgNVBAMMCVRlc3QgTGVhZjBZMBMGByqGSM49AgEGCCqGSM49AwEHA0IABBqQpJH6
+/KMGJcJyFrn1O5UFKfgFY0IpfJ6CFoijMxgd0wEkHfJxmr+raceuTykXXVVxdOpy
+UoQmZiXBmtw1PNujWDBWMBQGCisGAQQB1nkCAREEBgQEBAIFADAdBgNVHQ4EFgQU
+bIoAns4i7eKpY7/wWAY3dBcDKTcwHwYDVR0jBBgwFoAU2PaTsAJyUGeWGHR1//Xk
+G5yCfJAwCgYIKoZIzj0EAwMDSAAwRQIhAKkafkMZhoVFTrOE7T8o5oRFV79FzO0/
+P7n8s6KuwiLXAiA5qUmDUXEiI94HddoysULan5oiq73YDh2pwKOxkRv5Qw==
+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----