diff --git a/crypto/src/crypto/digests/GOST3411Digest.cs b/crypto/src/crypto/digests/GOST3411Digest.cs
index 218adf68c..123751baa 100644
--- a/crypto/src/crypto/digests/GOST3411Digest.cs
+++ b/crypto/src/crypto/digests/GOST3411Digest.cs
@@ -103,7 +103,7 @@ namespace Org.BouncyCastle.Crypto.Digests
length--;
}
- while (length > xBuf.Length)
+ while (length >= xBuf.Length)
{
Array.Copy(input, inOff, xBuf, 0, xBuf.Length);
diff --git a/crypto/src/crypto/digests/MD2Digest.cs b/crypto/src/crypto/digests/MD2Digest.cs
index 6d90f3f9d..f72d08768 100644
--- a/crypto/src/crypto/digests/MD2Digest.cs
+++ b/crypto/src/crypto/digests/MD2Digest.cs
@@ -159,7 +159,7 @@ namespace Org.BouncyCastle.Crypto.Digests
//
// process whole words.
//
- while (length > 16)
+ while (length >= 16)
{
Array.Copy(input,inOff,M,0,16);
ProcessChecksum(M);
diff --git a/crypto/src/crypto/digests/ParallelHash.cs b/crypto/src/crypto/digests/ParallelHash.cs
index 7d9be7618..f28795f5a 100644
--- a/crypto/src/crypto/digests/ParallelHash.cs
+++ b/crypto/src/crypto/digests/ParallelHash.cs
@@ -112,7 +112,7 @@ namespace Org.BouncyCastle.Crypto.Digests
if (i < len)
{
- while (len - i > B)
+ while (len - i >= B)
{
compress(inBuf, inOff + i, B);
i += B;
diff --git a/crypto/src/crypto/digests/TigerDigest.cs b/crypto/src/crypto/digests/TigerDigest.cs
index 059232de0..ce9efdbed 100644
--- a/crypto/src/crypto/digests/TigerDigest.cs
+++ b/crypto/src/crypto/digests/TigerDigest.cs
@@ -644,7 +644,7 @@ namespace Org.BouncyCastle.Crypto.Digests
//
// process whole words.
//
- while (length > 8)
+ while (length >= 8)
{
ProcessWord(input, inOff);
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