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scmail uses java.awt classes not available in Android #7

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gusak opened this issue Nov 21, 2012 · 4 comments · May be fixed by rtyley/spongycastle#20
Closed

scmail uses java.awt classes not available in Android #7

gusak opened this issue Nov 21, 2012 · 4 comments · May be fixed by rtyley/spongycastle#20

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@gusak
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gusak commented Nov 21, 2012

Hi,

I'm trying to use scmail lib for smime signing/encryption. I'm now stuck with one issue.

When we run the code below:
MimeBodyPart encryptedPart = encrypter.generate(body,new JceCMSContentEncryptorBuilder(CMSAlgorithm.RC2_CBC).setProvider(keyStoreProvider).build());
ByteArrayOutputStream out = new ByteArrayOutputStream();
encryptedPart.writeTo(out);

it fails in encryptedPart.writeTo(out); Here is the trace

11-21 13:30:53.385: E/dalvikvm(10025): Could not find class 'java.awt.datatransfer.DataFlavor[]', referenced from method org.spongycastle.mail.smime.handlers.pkcs7_mime.
11-21 13:30:53.385: W/dalvikvm(10025): VFY: unable to resolve new-array 3218 ([Ljava/awt/datatransfer/DataFlavor;) in Lorg/spongycastle/mail/smime/handlers/pkcs7_mime;
11-21 13:30:53.390: D/dalvikvm(10025): VFY: replacing opcode 0x23 at 0x000e
11-21 13:30:53.400: W/dalvikvm(10025): VFY: unable to find class referenced in signature ([Ljava/awt/datatransfer/DataFlavor;)
11-21 13:30:53.400: W/dalvikvm(10025): VFY: Ljava/lang/Object; is not instance of [Ljava/lang/Object;
11-21 13:30:53.405: W/dalvikvm(10025): VFY: bad arg 2 (into [Ljava/lang/Object;)
11-21 13:30:53.405: W/dalvikvm(10025): VFY: rejecting call to Lorg/spongycastle/mail/smime/handlers/PKCS7ContentHandler;. (Ljavax/activation/ActivationDataFlavor;[Ljava/awt/datatransfer/DataFlavor;)V
11-21 13:30:53.405: W/dalvikvm(10025): VFY: rejecting opcode 0x70 at 0x0004
11-21 13:30:53.410: W/dalvikvm(10025): VFY: rejected Lorg/spongycastle/mail/smime/handlers/pkcs7_mime;. ()V
11-21 13:30:53.410: W/dalvikvm(10025): Verifier rejected class Lorg/spongycastle/mail/smime/handlers/pkcs7_mime;
11-21 13:30:53.415: W/dalvikvm(10025): Class init failed in newInstance call (Lorg/spongycastle/mail/smime/handlers/pkcs7_mime;)

As i understand BC uses java.awt classes which do not exist on Android
@rtyley rtyley mentioned this issue Nov 21, 2012
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@gusak
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gusak commented Nov 21, 2012

i found this
http://stackoverflow.com/questions/13357855/how-to-fix-error-of-spongy-castle-on-android-could-not-find-class-java-awt-data

but it didn't work for me. if someone can try it i would appreciate for explanation

@rtyley
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rtyley commented Nov 21, 2012

Thanks for this report, I've not used the scmail functionality in anger (which is why it's marked as alpha on the project page) and I'm relying on feedback from users to judge stability.

Uses of java.awt classes are restricted to just the single class java.awt.datatransfer.DataFlavor and are all within this package:

https://github.com/rtyley/spongycastle/tree/sc-parent-1.47.0.2/scmail-jdk15on/src/main/java/org/spongycastle/mail/smime/handlers

Unfortunately the use of this class appears to be made necessary because several classes implement javax.activation.DataContentHandler which references it. I've only had a chance to take a brief look, it might make sense to just remove use of the DataContentHandler interface but I'm not sure of the knock-on effect of this.

The stackoverflow answer you reference above seems to give one line of attack, basically using the http://code.google.com/p/javamail-android project to use custom javamail & activation libs that don't reference the java.awt.datatransfer.DataFlavor class.

I don't have much time to look at this right now, but would love to hear of any progress you make.

@fuyiming
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what about this link , i meet the same problem as you. i am trying to solve it . https://code.google.com/p/androidmagnus/source/browse/trunk/Magnus/src/java/awt/datatransfer/DataFlavor.java?r=3

@rtyley rtyley mentioned this issue Oct 2, 2013
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@rtyley
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rtyley commented Jan 26, 2014

Due to the problems with unavailable classes, support for bc-mail has been dropped completely as of v1.50. Pull requests are welcome tho- make sure you use the new Spongy Castle repo- same place the old one was: https://github.com/rtyley/spongycastle

@rtyley rtyley closed this as completed Jan 26, 2014
@Skywalker-11 Skywalker-11 mentioned this issue Jun 20, 2016
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makes the mail module working in android Skywalker-11/spongycastle
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@rtyley @fuyiming @gusak