我需要從帶有包絡模式 (p7m) 或包絡模式 (p7s) 的簽名文件中提取其已簽名的原始文件。我很難弄清楚如何使用 bouncycastle 庫來做到這一點。我同時使用了 BouncyCastle 1.5 和 BouncyCastle 1.4private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(GetOriginalContentFromFileSigned.class);protected static CMSSignedData extractContent(InputStream buffer) throws IOException, CMSException { CMSSignedData cms = null; CMSSignedData signature = new CMSSignedData(buffer); Store cs = signature.getCertificates(); SignerInformationStore signers = signature.getSignerInfos(); Collection c = signers.getSigners(); Iterator it = c.iterator(); //the following array will contain the content of xml document byte[] data = null; while (it.hasNext()) { SignerInformation signer = (SignerInformation) it.next(); Collection certCollection = cs.getMatches(signer.getSID()); Iterator certIt = certCollection.iterator(); X509CertificateHolder cert = (X509CertificateHolder) certIt.next(); CMSProcessable sc = signature.getSignedContent(); data = (byte[]) sc.getContent(); cms = signature; } return cms;} protected static byte[] getOriginalDocumentBinaries(InputStream signedDocument) { try (InputStream is = getOriginalDocumentStream(signedDocument)) { return IOUtils.toByteArray(is); } catch (Exception e) { logger.warn("Unable to retrieve original document binaries", e); return null; }}分代碼摘自https://github.com/esig/dss項目我缺少什么使方法“getOriginalDocumentBinaries”起作用？對我來說似乎沒問題，但我不是充氣城堡的專家。問候。
2 回答
月關寶盒
TA貢獻1772條經驗 獲得超5個贊
這個解決方案似乎有效：
/**
* Extract content from p7m file
*/
private byte[] getOriginalDocumentBinaries(final byte[] signedDoc) throws SignerException {
ASN1InputStream asn1InputStream = null;
try {
asn1InputStream = new ASN1InputStream(new ByteArrayInputStream(signedDoc));
DERObject signedContent;
try {
signedContent = asn1InputStream.readObject();
}
catch (IOException cause) {
logger.error(cause.getMessage(), (Throwable)cause);
throw new SignerException(cause.getMessage(), cause);
}
CMSSignedData cmsSignedData;
try {
cmsSignedData = new CMSSignedData(ContentInfo.getInstance(signedContent));
}
catch (IllegalArgumentException cause2) {
logger.error(cause2.getMessage(), (Throwable)cause2);
throw new SignerException(cause2.getMessage(), cause2);
}catch (Throwable cause2) {
throw new SignerException(cause2.getMessage(), cause2);
}
return (byte[])((CMSProcessableByteArray)cmsSignedData.getSignedContent()).getContent();
}catch(Exception ex){
logger.error(ex.getMessage(),ex);
throw new SignerException(ex);
}
finally {
try {
asn1InputStream.close();
}
catch (IOException ex) {}
}
}
慕田峪7331174
TA貢獻1828條經驗 獲得超13個贊
我剛剛遇到了同樣的問題，我實施了這個。我相信這可能對其他人有幫助。
/**
*Extract from .p7m file and write into new file
*/
public void extractTxtFileFromP7M() throws Exception {
File file = new File(".p7m FilePath");
String fileName = FilenameUtils.removeExtension(file.getName());
byte[] p7mFileByteArray = fromFileToByteArray(file);
byte[] extractedFileByteArray = getData(p7mFileByteArray);
File extractedFile = new File("..../fileName");
FileUtils.writeByteArrayToFile(extractedFile, extractedFileByteArray);
}
private byte[] fromFileToByteArray(File file) {
try {
return FileUtils.readFileToByteArray(file);
} catch (IOException e) {
log.error("Error while reading .p7m file!", e);
}
return new byte[0];
}
private byte[] getData(final byte[] p7bytes) {
CMSSignedData cms = null;
try {
cms = new CMSSignedData(p7bytes);
} catch (CMSException e) {
log.error("Error while converting bytes to CMSSignedData : " + e.getMessage(), e);
}
if( cms == null || cms.getSignedContent() == null) {
return new byte[0];
}
return (byte[]) cms.getSignedContent().getContent();
}
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