read encryption attachment of .msg file in java

Question

I have many .msg files which has encrypted attachment. I currently use apache poi library. Currently, I have code that giving a path of a .docx, .xls, .xlsx file, I can have the decrypted content. The problem is I want to get the attachment of msg file decrypted.

public static void decryptMSG(String path,String[] password) throws IOException {
    MAPIMessage msg = new MAPIMessage(path);
    AttachmentChunks attachments[] = msg.getAttachmentFiles();
    if(attachments.length > 0) {
        for (AttachmentChunks a  : attachments) {
            String attachname=a.attachLongFileName.toString();
            ByteArrayInputStream fileIn = new ByteArrayInputStream(a.attachData.getValue());
            File f = new File(path+"_decrypted"+ a.attachLongFileName.toString()); // output
            OutputStream fileOut = null;
            try {
                fileOut = new FileOutputStream(f);
                byte[] buffer = new byte[2048];
                int bNum = fileIn.read(buffer);
                while(bNum > 0) {
                    fileOut.write(buffer);
                    bNum = fileIn.read(buffer);
                }   
            }
            finally{
                   .....
            }

This is the normal code to read .msg attachments which are not encrypted.

Q1: could sb kindly tell me where I can set the password?

Q2: if it's not support by the library to set the password, is it possible to copy the AttachmentChunks to a path? I mean give each Attachmentchunk a physical path where the Attachemntchunk is stored?

Q3: or if you know any lib in java or python could solve decrypting .msg file, please tell me. Thanks,

llogiq · Accepted Answer · 2015-07-31 13:18:29Z

1

You need to create an EncryptionKey/EncryptionInfo (depending on the encryption method). See this page for a more in-depth explanation.

answered Jul 31, 2015 at 13:18

llogiq

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