Small, but important update to this...I was signing the wrong thing and
missing a section of the SignerInfo. The code in the previous post
generates a valid ASN.1 encoded SignerInfo, but not one that will pass
its own verify method. The below code works properly.
public SignerInfo createBCSignerInfo(byte[] pkiDataHashBytes){
Attribute contentTypeAttr = new Attribute(new
DERObjectIdentifier(CONTENT_TYPE_OID), new DERSet(new
DERObjectIdentifier(PKIDATA_OID)));
Attribute messageDigestAttr = new Attribute(new
DERObjectIdentifier(MESSAGE_DIGEST_OID), new DERSet(new
DEROctetString(pkiDataHashBytes)));
ASN1Set authenticatedAttributes = new DERSet(new Attribute[]
{contentTypeAttr, messageDigestAttr});
ASN1TaggedObject signedAttrTaggedObject = new
DERTaggedObject(false, 0, authenticatedAttributes);
//sign the authenticatedAttributes
Signature sig = Signature.getInstance("SHA1withRSA");
sig.initSign(agentPrivateKey);
sig.update(authenticatedAttributes.getEncoded());
byte[] encryptedHashBytes = sig.sign();
//Add BC pieces to create a SignerInfo
ASN1EncodableVector bcSignerInfo = new ASN1EncodableVector();
bcSignerInfo.add(new DERInteger(1)); //version 1 if using
issuerAndSerialNumber, 3 if using subjectKeyIdentifier
bcSignerInfo.add(new
IssuerAndSerialNumber(PrincipalUtil.getIssuerX509Principal(agentCert),agentCert.getSerialNumber()));
bcSignerInfo.add(new
org.bouncycastle.asn1.x509.AlgorithmIdentifier(SHA1_OID)); //SHA1 OID
bcSignerInfo.add(signedAttrTaggedObject);
bcSignerInfo.add(new
org.bouncycastle.asn1.x509.AlgorithmIdentifier(RSA_ENCRYPTION_OID));
//SHA1withRSA OID (rsaEncryption)
bcSignerInfo.add(new DEROctetString(encryptedHashBytes));
//DER encode the BC SignerInfo
ByteArrayOutputStream baos = new ByteArrayOutputStream();
DEROutputStream dout = new DEROutputStream(baos);
dout.writeObject(new DERSequence(bcSignerInfo));
dout.close();
byte[] signerInfoDERBytes = baos.toByteArray();
//parse the DER signerInfo created with BouncyCastle into a JSS
SignerInfo
return (SignerInfo) ASN1Util.decode(SignerInfo.getTemplate(),
signerInfoDERBytes);
}
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