Hi Jonas
I expect this is too late to be helpful to you now, but for the sake of
future readers:
The .NET signature here is in PKCS#1 v1.5 format, so the hash is
embedded in a DigestInfo ASN.1 structure.
To sign/verify this format with BC, use e.g.
SignerUtilities.GetSigner("SHA-1withRSA"). Note that this signer will
calculate the hash internally so it should be passed the full input.
Alternatively, the RsaDigestSigner class can be used directly.
I assume the "flexible" verification by .NET is simply accepting either
format based on the length of the signature, while BC will only check
for the specific format it is expecting.
Regards,
Pete Dettman.
On 5/12/2014 6:07 pm, Jonas Söderberg wrote:
I have now dumped the signatures and even created a signature with
OpenSSL who returns exactly the same signature as BC.
It seem that the .NET signature adds some more information in the
signature.
.NET
0000 - 00 01 ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
0010 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
0020 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
0030 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
0040 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
0050 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
0060 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
0070 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
0080 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
0090 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
00a0 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
00b0 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
00c0 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
00d0 - ff ff ff ff ff ff ff ff-ff ff ff ff 00 30 21 30 .............0!0
00e0 - 09 06 05 2b 0e 03 02 1a-05 00 04 14 e4 9b c4 9e ...+............
00f0 - 6a 3c 24 a1 c6 ad ea 1a-9a 3e 3c 0f ca 1a ee da j<$......><.....
BC:
0000 - 00 01 ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
0010 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
0020 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
0030 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
0040 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
0050 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
0060 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
0070 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
0080 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
0090 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
00a0 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
00b0 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
00c0 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
00d0 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
00e0 - ff ff ff ff ff ff ff ff-ff ff ff 00 e4 9b c4 9e ................
00f0 - 6a 3c 24 a1 c6 ad ea 1a-9a 3e 3c 0f ca 1a ee da j<$......><.....
OpenSSL:
0000 - 00 01 ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
0010 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
0020 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
0030 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
0040 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
0050 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
0060 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
0070 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
0080 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
0090 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
00a0 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
00b0 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
00c0 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
00d0 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................
00e0 - ff ff ff ff ff ff ff ff-ff ff ff 00 e4 9b c4 9e ................
00f0 - 6a 3c 24 a1 c6 ad ea 1a-9a 3e 3c 0f ca 1a ee da j<$......><.....
Regars,
Jonas
