From bc33ec1929f39ad6c0d8c031d1f66d1b19efe9ae Mon Sep 17 00:00:00 2001
From: M66B <M66B@users.noreply.github.com>
Date: Thu, 19 Dec 2019 11:23:48 +0100
Subject: [PATCH] Use S/MIME public key sign algorithm

---
 app/src/main/java/eu/faircode/email/FragmentCompose.java | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/app/src/main/java/eu/faircode/email/FragmentCompose.java b/app/src/main/java/eu/faircode/email/FragmentCompose.java
index 9355d46de7..cfd4b3727c 100644
--- a/app/src/main/java/eu/faircode/email/FragmentCompose.java
+++ b/app/src/main/java/eu/faircode/email/FragmentCompose.java
@@ -1979,7 +1979,9 @@ public class FragmentCompose extends FragmentBase {
                 CMSSignedDataGenerator cmsGenerator = new CMSSignedDataGenerator();
                 cmsGenerator.addCertificates(store);
 
-                ContentSigner contentSigner = new JcaContentSignerBuilder("SHA256withRSA")
+                String salgo = "SHA256with" + chain[0].getPublicKey().getAlgorithm();
+                Log.i("Sign algorithm=" + salgo);
+                ContentSigner contentSigner = new JcaContentSignerBuilder(salgo)
                         .build(privkey);
                 DigestCalculatorProvider digestCalculator = new JcaDigestCalculatorProviderBuilder()
                         .build();