Problem in decrypting SMIME

[Suleman Butt]

Hi Guys,

I am findign it difficult as to how I can create an SMIMEEnveloped object:

MimeBodyPart encryptedMimeBodyPart = new MimeBodyPart(
new
FileInputStream("C:/Temp/MSCONS_TL_9901068000001_4033871000202_20140730_000544422736-att/smime.p7m"));

SMIMEEnveloped enveloped = new
SMIMEEnveloped(encryptedMimeBodyPart);

On executing my second line, I get the following exception:

java.lang.NullPointerException
at org.bouncycastle.cms.CMSEnvelopedData.<init>(Unknown Source)
at org.bouncycastle.cms.CMSEnvelopedData.<init>(Unknown Source)
at org.bouncycastle.mail.smime.SMIMEEnveloped.<init>(Unknown Source)
at decryption_util.loadAlias(decryption_util.java:124)
at decryption_util.exportPrivateKey(decryption_util.java:89)
at decryption_util.main(decryption_util.java:62)


I have smime.p7m file (encrypted) on my machine, which I want to decrypt.

I have the complete certificate, which works fine when I load it on my
windows machine.

The certificate loading also works fine, in my opinion in my java program,
it just that it is unable to decrypt the smime part.

I am using bcpkix-jdk15on-151 and bcmail-jdk15on-151 as bouncy castle jars.

Any help in this regard shall be highlly appreciated.

Attached is the complete source file

Thanks.