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Support S/MIME signed data (untested)

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M66B
2020-01-10 19:06:54 +01:00
parent 7f92f5692b
commit f22ec04ef8
3 changed files with 30 additions and 3 deletions
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26
app/src/main/java/eu/faircode/email/FragmentMessages.java
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@@ -119,6 +119,7 @@ import org.bouncycastle.cms.CMSException;
import org.bouncycastle.cms.CMSProcessable;
import org.bouncycastle.cms.CMSProcessableFile;
import org.bouncycastle.cms.CMSSignedData;
import org.bouncycastle.cms.CMSTypedData;
import org.bouncycastle.cms.CMSVerifierCertificateNotValidException;
import org.bouncycastle.cms.KeyTransRecipientId;
import org.bouncycastle.cms.RecipientInformation;
@@ -4668,6 +4669,7 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
if (EntityMessage.SMIME_SIGNONLY.equals(type)) {
// Get content/signature
boolean data = false;
File content = null;
File signature = null;
List<EntityAttachment> attachments = db.attachment().getAttachments(message.id);
@@ -4676,13 +4678,18 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
if (!attachment.available)
throw new IllegalArgumentException(context.getString(R.string.title_attachments_missing));
signature = attachment.getFile(context);
} else if (EntityAttachment.SMIME_SIGNED_DATA.equals(attachment.encryption)) {
if (!attachment.available)
throw new IllegalArgumentException(context.getString(R.string.title_attachments_missing));
data = true;
signature = attachment.getFile(context);
} else if (EntityAttachment.SMIME_CONTENT.equals(attachment.encryption)) {
if (!attachment.available)
throw new IllegalArgumentException(context.getString(R.string.title_attachments_missing));
content = attachment.getFile(context);
}
if (content == null)
if (content == null && !data)
throw new IllegalArgumentException("Signed content missing");
if (signature == null)
throw new IllegalArgumentException("Signature missing");
@@ -4690,7 +4697,22 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
// Build signed data
CMSProcessable signedContent = new CMSProcessableFile(content);
FileInputStream fis = new FileInputStream(signature);
CMSSignedData signedData = new CMSSignedData(signedContent, fis);
CMSSignedData signedData;
if (data) {
signedData = new CMSSignedData(fis);
CMSTypedData sc = signedData.getSignedContent();
if (sc == null)
throw new IllegalArgumentException("Signed content missing");
try (OutputStream os = new FileOutputStream(message.getFile(context))) {
sc.write(os);
}
db.message().setMessageEncrypt(message.id, null);
db.message().setMessageStored(message.id, new Date().getTime());
} else
signedData = new CMSSignedData(signedContent, fis);
// Check signature
Store store = signedData.getCertificates();