internal static bool IsTimestampValid(Timestamp timestamp, Signature signature, bool treatIssuesAsErrors, List <SignatureLog> issues, SigningSpecifications spec)
{
if (timestamp == null)
{
throw new ArgumentNullException(nameof(timestamp));
}
if (signature == null)
{
throw new ArgumentNullException(nameof(signature));
}
if (issues == null)
{
throw new ArgumentNullException(nameof(issues));
}
// Default to specification v1
spec = spec ?? SigningSpecifications.V1;
var isValid = true;
var signerInfo = timestamp.SignerInfo;
if (timestamp.SignerInfo.Certificate != null)
{
try
{
signerInfo.CheckSignature(verifySignatureOnly: true);
}
catch (Exception e)
{
issues.Add(SignatureLog.Issue(treatIssuesAsErrors, NuGetLogCode.NU3021, Strings.TimestampSignatureValidationFailed));
issues.Add(SignatureLog.DebugLog(e.ToString()));
isValid = false;
}
if (!CertificateUtility.IsSignatureAlgorithmSupported(signerInfo.Certificate))
{
issues.Add(SignatureLog.Issue(treatIssuesAsErrors, NuGetLogCode.NU3022, Strings.TimestampUnsupportedSignatureAlgorithm));
isValid = false;
}
if (!CertificateUtility.IsCertificatePublicKeyValid(signerInfo.Certificate))
{
issues.Add(SignatureLog.Issue(treatIssuesAsErrors, NuGetLogCode.NU3023, Strings.TimestampCertificateFailsPublicKeyLengthRequirement));
isValid = false;
}
if (!spec.AllowedHashAlgorithmOids.Contains(signerInfo.DigestAlgorithm.Value))
{
issues.Add(SignatureLog.Issue(treatIssuesAsErrors, NuGetLogCode.NU3024, Strings.TimestampUnsupportedSignatureAlgorithm));
isValid = false;
}
try
{
var hashAlgorithm = CryptoHashUtility.OidToHashAlgorithmName(timestamp.TstInfo.HashAlgorithmId.Value);
var signatureValue = signature.GetSignatureValue();
var messageHash = hashAlgorithm.ComputeHash(signatureValue);
if (!timestamp.TstInfo.HasMessageHash(messageHash))
{
issues.Add(SignatureLog.Issue(treatIssuesAsErrors, NuGetLogCode.NU3019, Strings.TimestampIntegrityCheckFailed));
isValid = false;
}
}
catch
{
// If the hash algorithm is not supported OidToHashAlgorithmName will throw
issues.Add(SignatureLog.Issue(treatIssuesAsErrors, NuGetLogCode.NU3030, Strings.TimestampMessageImprintUnsupportedHashAlgorithm));
isValid = false;
}
if (CertificateUtility.IsCertificateValidityPeriodInTheFuture(signerInfo.Certificate))
{
issues.Add(SignatureLog.Issue(treatIssuesAsErrors, NuGetLogCode.NU3025, Strings.TimestampNotYetValid));
isValid = false;
}
}
else
{
issues.Add(SignatureLog.Issue(treatIssuesAsErrors, NuGetLogCode.NU3020, Strings.TimestampNoCertificate));
isValid = false;
}
return(isValid);
}