extracting original data from a PKCS7SignedData object

[Antonio Bonavita]

Hello to everybody,

Is it possible to extract the original data
from a PKCS7SignedData object?

In my example I load bytes from a file that is a
signed document (detached signature) into an
array of bytes:

byte[] myBytes = loadBytes(filename);

then i do this

PKCS7SignedData pkcs7 = new PKCS7SignedData(mybytes);

and then i'd like to verify signature extracting original
bytes and signature from a byte[] which contain
pkcs7 detached signed data.

How can I do this?

I've not seen any get method which could help me...

Hoping you have some suggestions,
I thank you in advance,

Antonio

[MACKO Roman]

Hi,

I don't know what version of BC you use but  javadoc in version 1.28
states
the PKCS7SignedData class is pretty close to obsolete and for a much
better
implementation of PKCS7 you should have a look at org.bouncycastle.cms
package
where you can find CMSSignedData and CMSSignedDataGenerator classes.
Class CMSSignedData, for example, have method getSignedContent().

roman

> -----Original Message-----
> From: Antonio Bonavita [mailto:[hidden email]]
> Sent: Monday, May 30, 2005 6:36 PM
> To: [hidden email]
> Subject: [dev-crypto] extracting original data from a
> PKCS7SignedData object
>
> Hello to everybody,
>
> Is it possible to extract the original data from a
> PKCS7SignedData object?
>
> In my example I load bytes from a file that is a signed
> document (detached signature) into an array of bytes:
>
> byte[] myBytes = loadBytes(filename);
>
> then i do this
>
> PKCS7SignedData pkcs7 = new PKCS7SignedData(mybytes);
>
> and then i'd like to verify signature extracting original
> bytes and signature from a byte[] which contain
> pkcs7 detached signed data.
>
> How can I do this?
>
> I've not seen any get method which could help me...
>
> Hoping you have some suggestions,
> I thank you in advance,
>
> Antonio
>
>
>

[Antonio Bonavita]

Thank you very much!
I had to use org.bouncycastle.cms package to manipulate PKCS7SignedData
objects

antonio

MACKO Roman wrote:

>Hi,
>
>I don't know what version of BC you use but  javadoc in version 1.28
>states
>the PKCS7SignedData class is pretty close to obsolete and for a much
>better
>implementation of PKCS7 you should have a look at org.bouncycastle.cms
>package
>where you can find CMSSignedData and CMSSignedDataGenerator classes.
>Class CMSSignedData, for example, have method getSignedContent().
>
>roman
>