Question

我需要使用信封模式（p7m）或信封模式（p7s）从签名文件中提取对其进行签名的原始文件。

我很难弄清楚如何使用bouncycastle库执行此操作。

我同时使用BouncyCastle 1.5和BouncyCastle 1.4

var result = query.Select(employee => new EMPLOYEE_DTO()
{
     PHONE_NO = employee.PHONE_NO,
     EMAIL = employee.EMAIL,
     EMP_NO = employee.EMP_NO,
})
.ToList();

部分代码来自https://github.com/esig/dss项目

我缺少使方法“ getOriginalDocumentBinaries”工作的原因吗？对我来说似乎没事，但我不是Bouncycastle的专家。

问候。

Answer 1

我只是遇到了同样的问题，所以我实现了它。我相信这对其他人可能会有帮助。

/**
*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();
}

Answer 2

此解决方案似乎有效：

/**
* 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) {}
        }
    }

如何从签名文件p7m / Enveloped和p7s / Enveloping中提取使用Java Bouncycastle签名的原始文件

2 个答案: