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Trim the leading zero from PuTTY ECDSA private keys #1827

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Merged
Rob-Hague merged 1 commit into from
Aug 17, 2026
+12 −1
Merged

Trim the leading zero from PuTTY ECDSA private keys #1827

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2 changes: 1 addition & 1 deletion src/Renci.SshNet/PrivateKeyFile.PuTTY.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -175,7 +175,7 @@ public Key Parse()
var curve = publicKeyReader.ReadString(Encoding.ASCII);
var pub = publicKeyReader.ReadBinary();
var prv = privateKeyReader.ReadBinary();
parsedKey = new EcdsaKey(curve, pub, prv);
parsedKey = new EcdsaKey(curve, pub, prv.TrimLeadingZeros());
break;
case "ssh-rsa":
var exponent = publicKeyReader.ReadBigInt();
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10 changes: 10 additions & 0 deletions test/Data/Key.PuTTY3.ECDSA.LeadingZero.ppk
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Original file line number Diff line number Diff line change
@@ -0,0 +1,10 @@
PuTTY-User-Key-File-3: ecdsa-sha2-nistp256
Encryption: none
Comment: imported-openssh-key
Public-Lines: 3
AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBNhE4rS0CTev
/VEC6BJ/142eE3dU88t1rpzrSJ3iEcyp+3itM0+182eXSswmunZo/TNyvFE1sXKK
1x0COQJl6hU=
Private-Lines: 1
AAAAIQDTj7+GAKceovRR6/NV8TFi+Mc5cHl555sVVokgFkofYA==
Private-MAC: 71bc2b8cbe9f209ff693afb9b217f060f5dc4d4ae73e136e28fa1034b0fdd982
1 change: 1 addition & 0 deletions test/Renci.SshNet.Tests/Classes/PrivateKeyFileTest.cs
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Expand Up @@ -346,6 +346,7 @@ public void ConstructorWithFileNameAndPassPhraseShouldBeAbleToReadFileThatIsShar
[DataRow("Key.PuTTY2.RSA.Encrypted.12345.ppk", "12345", typeof(RsaKey))]
[DataRow("Key.PuTTY2.RSA.ppk", null, typeof(RsaKey))]
[DataRow("Key.PuTTY3.ECDSA.Encrypted.Argon2id.12345.ppk", "12345", typeof(EcdsaKey))]
[DataRow("Key.PuTTY3.ECDSA.LeadingZero.ppk", null, typeof(EcdsaKey))]
[DataRow("Key.PuTTY3.ECDSA.ppk", null, typeof(EcdsaKey))]
[DataRow("Key.PuTTY3.Ed25519.Encrypted.Argon2i.12345.ppk", "12345", typeof(ED25519Key))]
[DataRow("Key.PuTTY3.Ed25519.Encrypted.Argon2d.12345.ppk", "12345", typeof(ED25519Key))]
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