jsign-core/src/main/java/net/jsign/msi/MSIFile.java [229:245]:
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                    signatures.add(signedData);

                    // look for nested signatures
                    SignerInformation signerInformation = signedData.getSignerInfos().getSigners().iterator().next();
                    AttributeTable unsignedAttributes = signerInformation.getUnsignedAttributes();
                    if (unsignedAttributes != null) {
                        Attribute nestedSignatures = unsignedAttributes.get(AuthenticodeObjectIdentifiers.SPC_NESTED_SIGNATURE_OBJID);
                        if (nestedSignatures != null) {
                            for (ASN1Encodable nestedSignature : nestedSignatures.getAttrValues()) {
                                signatures.add(new CMSSignedData((CMSProcessable) null, ContentInfo.getInstance(nestedSignature)));
                            }
                        }
                    }
                } catch (UnsupportedOperationException e) {
                    // unsupported type, just skip
                } catch (Exception e) {
                    e.printStackTrace();
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