/// <summary>
/// Calculates the signature for this package.
/// </summary>
/// <param name="package">
/// The package for whcih to calculate the signature.
/// </param>
/// <param name="signer">
/// The signer to use.
/// </param>
/// <param name="compressedPayloadStream">
/// The compressed payload.
/// </param>
public void CalculateSignature(RpmPackage package, IPackageSigner signer, Stream compressedPayloadStream)
{
RpmSignature signature = new RpmSignature(package);
using (MemoryStream headerStream = this.GetHeaderStream(package))
using (ConcatStream headerAndPayloadStream = new ConcatStream(leaveOpen: true, streams: new Stream[] { headerStream, compressedPayloadStream }))
{
SHA1 sha = SHA1.Create();
signature.Sha1Hash = sha.ComputeHash(headerStream);
MD5 md5 = MD5.Create();
signature.MD5Hash = md5.ComputeHash(headerAndPayloadStream);
// Verify the PGP signatures
// 3 for the header
headerStream.Position = 0;
signature.HeaderPgpSignature = signer.Sign(headerStream);
headerAndPayloadStream.Position = 0;
signature.HeaderAndPayloadPgpSignature = signer.Sign(headerAndPayloadStream);
// Verify the signature size (header + compressed payload)
signature.HeaderAndPayloadSize = (int)headerAndPayloadStream.Length;
}
// Verify the payload size (header + uncompressed payload)
using (Stream payloadStream = RpmPayloadReader.GetDecompressedPayloadStream(package, compressedPayloadStream))
{
signature.UncompressedPayloadSize = (int)payloadStream.Length;
}
}
/// <summary>
/// Determines the offsets for all records in the signature of a package.
/// </summary>
/// <param name="package">
/// The package for which to generate the offsets.
/// </param>
public void CalculateSignatureOffsets(RpmPackage package)
{
var signature = new RpmSignature(package);
signature.ImmutableRegionSize = -1 * Marshal.SizeOf <IndexHeader>() * package.Signature.Records.Count;
this.CalculateSectionOffsets(package.Signature, k => (int)k);
}
