1 files changed, 28 insertions, 0 deletions
diff --git a/crypto/src/cms/CounterSignatureDigestCalculator.cs b/crypto/src/cms/CounterSignatureDigestCalculator.cs
new file mode 100644
index 000000000..6f8bf65a2
--- /dev/null
+++ b/crypto/src/cms/CounterSignatureDigestCalculator.cs
@@ -0,0 +1,28 @@
+using System;
+
+using Org.BouncyCastle.Crypto;
+using Org.BouncyCastle.Security;
+
+namespace Org.BouncyCastle.Cms
+{
+ internal class CounterSignatureDigestCalculator
+ : IDigestCalculator
+ {
+ private readonly string alg;
+ private readonly byte[] data;
+
+ internal CounterSignatureDigestCalculator(
+ string alg,
+ byte[] data)
+ {
+ this.alg = alg;
+ this.data = data;
+ }
+
+ public byte[] GetDigest()
+ {
+ IDigest digest = CmsSignedHelper.Instance.GetDigestInstance(alg);
+ return DigestUtilities.DoFinal(digest, data);
+ }
+ }
+}
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