On Mon, Jan 14, 2013 at 10:39 PM, mbarbiero <marco.barbi...@gmail.com> wrote:
>
> * does the raw (byte array) signature match?
> - I'm not sure about this, but the digestvalues in dotNet and BoucyCastle
> are identical.
For Java you would get the return value of signer.sign() and convert to
hex to compare. Don't remember the details about .NET.
> - A question: How to cipher digestvalue directly with the privatekey?
You'll have to pad it first as per the PKCS#1.5 spec and then encrypt with the
private key using Cipher.getInstance("RSA/ECP/NoPadding").
Cipher.getInstance("RSA/ECB/PKCS1Padding") should pad it for you.
Those might not be available on all Android versions though. However,
you are probably having a different problem...
>
> * are you using the same options for Base64? There are subtle variations
> here (padding character, line breaks, etc.).
> - The signatures values are very different. I replace the tag in BC file by
> dotNet signature value and the webservice returns OK. It's a mystery!!!
> Below, the two exemples of the signature.
The XML suggests you are using the same key and signing the same
hash (digest value). However, the most plausible explanation for getting
a different signature value is using different keys. Or maybe you keys
are interpreted differently on both platforms? How do you read/pass the
key on .NET and Java? Are you absolutely sure that it is indeed the same
private key?
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