Help!! BC crafted PKCS7/CMS envelope verification by OpenSSL
Madan Prabhu <[email protected]> Thu, 13 Dec 2018 18:03:12 +0530
| Newsgroups | gmane.comp.encryption.bouncy-castle.devel |
|---|---|
| Message-ID | <CA+gWUnQ42SDxRpXfvkacgknRT2p0-oOs6wieGwtOigzew9E2DQ@mail.gmail.com> |
Dear Team,
We were using the following code snippet for signing and crafting the PKCS7
files.,
public static String signAttached(X509Certificate obCert,PrivateKey
obPvtKey,String signData, boolean attached){
byte[] envelopedData = null;
try{
Security.addProvider(new BouncyCastleProvider());
//Signed Attributes for TimeStamping
final ASN1EncodableVector signedAttributes = new
ASN1EncodableVector();
final Attribute signingAttribute = new
Attribute(CMSAttributes.signingTime, new DERSet(new DERUTCTime(new
Date())));
signedAttributes.add(signingAttribute);
// Create the signing table
final AttributeTable signedAttributesTable = new
AttributeTable(signedAttributes);
// Create the table table generator that will added to the Signer
builder
final DefaultSignedAttributeTableGenerator signedAttributeGenerator =
new DefaultSignedAttributeTableGenerator(signedAttributesTable);
//Build CMS
X509Certificate cert = (X509Certificate) obCert;
List certList = new ArrayList();
CMSTypedData msg = new
CMSProcessableByteArray(signData.getBytes(java.nio.charset.StandardCharsets.UTF_8));
certList.add(cert);
Store certs = new JcaCertStore(certList);
CMSSignedDataGenerator gen = new CMSSignedDataGenerator();
ContentSigner sha1Signer = new
JcaContentSignerBuilder("SHA1withRSA").setProvider("SunMSCAPI").build(obPvtKey);
gen.addSignerInfoGenerator(new JcaSignerInfoGeneratorBuilder(new
JcaDigestCalculatorProviderBuilder().setProvider("BC").build()).build(sha1Signer,
cert));
gen.addCertificates(certs);
//true means Attached; false means detached content
CMSSignedData sigData = gen.generate(msg, attached);
envelopedData = sigData.getEncoded();
}catch(Exception e){
e.printStackTrace();
}
return new String(Base64.encode(envelopedData));
}
The final Base64 encoded envelope persisted into the file. Later, When i
tried to verify the signature by using the following command;
$ openssl cms -verify -noverify -inform PEM -in new.p7s
Verification successful
madan prabhu nic tamilnadu state unit
For attached signature; it works fine. Same thing for the detached
signature; it's not working.
$openssl cms -verify -noverify -inform PEM -in newd.p7s -content
newd.txt
madan prabhu nic tamilnadu state unit
Verification failure
140109147780928:error:2E09A09E:CMS
routines:CMS_SignerInfo_verify_content:verification
failure:crypto/cms/cms_sd.c:821:
140109147780928:error:2E09D06D:CMS routines:CMS_verify:content verify
error:crypto/cms/cms_smime.c:393:
The content of the file newd.txt is exactly same data.
Kindly suggest me, how to resolve the Openssl verification successfully;
since we are in development of cross platform supported solution.
Note: Verification of both signatures(attached and detached) works fine in
BC java-code verification using JcaSimpleSignerInfoVerifierBuilder.
--
*Thanks & Regards,*
D.Madan Prabhu
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