pdf file signed with SHA256withECDSA
Massa Alfonso <[email protected]> Tue, 26 Jul 2016 11:06:04 +0000
| Newsgroups | gmane.comp.java.lib.itext.general |
|---|---|
| Message-ID | <0E92C440D7EC7B45BFDB7E440BFEBB65894B6C6A@FVG-EMB-01V-TS.UCFVG.hosted> |
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Hi,
I have a pdf file signed with Elliptic curve Digital Signature Algorithm (D=
SA) coupled with the Secure Hashing Algorithm (SHA256) algorithm (oid: 1.2.=
840.10045.4.3.2) .
When I try and verify the signature with this code (iText 5.5.9):
PdfPKCS7 pk =3D af.verifySignature(name, "BC");
I get the following:
no such algorithm: SHA256with1.2.840.10045.4.3.2 for provider BC
Is it a wanted feature that itext does not support SHA256withECDSA?
When I modify com.itextpdf.text.pdf.security.EncryptionAlgorithms class wit=
h:
algorithmNames.put("1.2.840.10045.4.1", "ECDSA");
algorithmNames.put("1.2.840.10045.4.3.2", "ECDSA");
algorithmNames.put("1.2.840.10045.4.3.3", "ECDSA");
algorithmNames.put("1.2.840.10045.4.3.4", "ECDSA");
it seems to work.
I wonder whether this solution is correct.
Will iText support SHA256withECDSA in future?
Best regards
Alfonso
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<p class=3D"MsoNormal"><span style=3D"color:black">Hi,<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span style=3D"color:black">I have a pdf file signed=
with Elliptic curve Digital Signature Algorithm (DSA) coupled with the Sec=
ure Hashing Algorithm (SHA256) algorithm (oid: 1.2.840.10045.4.3.2) .<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black"><o:p> </o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"color:black">When I try and verify th=
e signature with this code (iText 5.5.9):<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black"><o:p> </o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"color:black"> =
PdfPKCS7 pk =
=3D af.verifySignature(name, “BC”);<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black"><o:p> </o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"color:black">I get the following:<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black"><o:p> </o:p></span>=
</p>
<p class=3D"MsoNormal" style=3D"text-indent:35.4pt"><span style=3D"color:bl=
ack">no such algorithm: SHA256with1.2.840.10045.4.3.2 for provider BC<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black"><o:p> </o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"color:black">Is it a wanted feature t=
hat itext does not support SHA256withECDSA?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black"><o:p> </o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"color:black">When I modify com.itextp=
df.text.pdf.security.EncryptionAlgorithms class with:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black"><o:p> </o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"color:black"> =
algorithmNames.put("1.2.840.10045.4.1", "=
ECDSA");<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black"> =
algorithmNames.put("1.2.840.10045.4.3.2", &quo=
t;ECDSA");<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black"> =
algorithmNames.put("1.2.840.10045.4.3.3", &quo=
t;ECDSA");<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black"> =
algorithmNames.put("1.2.840.10045.4.3.4", &quo=
t;ECDSA");<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black"><o:p> </o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"color:black">it seems to work.<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black"><o:p> </o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"color:black">I wonder whether this so=
lution is correct.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black"><o:p> </o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"color:black">Will iText support=
SHA256withECDSA in future?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black"><o:p> </o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"color:black">Best regards<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"color:black"><o:p> </o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"color:black">Alfonso<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"color:black"><o:p> </o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"color:black"><o:p> </o:p></span>=
</p>
</div>
<br>
AVVISO DI RISERVATEZZA Informazioni riservate possono essere contenute nel =
messaggio o nei suoi allegati. Se non siete i destinatari indicati nel mess=
aggio, o responsabili per la sua consegna alla persona, o se avete ricevuto=
il messaggio per errore, siete
pregati di non trascriverlo, copiarlo o inviarlo ad alcuno. In tal caso vi=
invitiamo a cancellare il messaggio ed i suoi allegati. Grazie.
<br>
CONFIDENTIALITY NOTICE Confidential information may be contained in this me=
ssage or in its attachments. If you are not the addressee indicated in this=
message, or responsible for message delivering to that person, or if you h=
ave received this message in error,
you may not transcribe, copy or deliver this message to anyone. In that ca=
se, you should delete this message and its attachments. Thank you.
</body>
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