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Advertise the RFC 8731 kex name curve25519-sha256 #187

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Merged
vicajilau merged 1 commit into from
Jul 27, 2026
Merged

Advertise the RFC 8731 kex name curve25519-sha256 #187

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9 changes: 9 additions & 0 deletions lib/src/algorithm/ssh_kex_type.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,15 @@ class SSHKexType extends SSHAlgorithm {
digestFactory: digestSha256,
);

/// RFC 8731 name for the same algorithm as [x25519]. Servers hardened to a
/// single kex commonly offer only this spelling, and OpenSSH matches names
/// literally — without it the handshake dies with "no matching key exchange
/// method found".
static const x25519Rfc = SSHKexType._(
name: 'curve25519-sha256',
digestFactory: digestSha256,
);

static const nistp256 = SSHKexType._(
name: 'ecdh-sha2-nistp256',
digestFactory: digestSha256,
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1 change: 1 addition & 0 deletions lib/src/ssh_algorithm.dart
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Expand Up @@ -46,6 +46,7 @@ class SSHAlgorithms {
const SSHAlgorithms({
this.kex = const [
SSHKexType.x25519,
SSHKexType.x25519Rfc,
SSHKexType.nistp521,
SSHKexType.nistp384,
SSHKexType.nistp256,
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1 change: 1 addition & 0 deletions lib/src/ssh_transport.dart
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Expand Up @@ -1196,6 +1196,7 @@ class SSHTransport {

switch (_kexType) {
case SSHKexType.x25519:
case SSHKexType.x25519Rfc:
_kex = await SSHKexX25519.createAsync();
break;
case SSHKexType.nistp256:
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1 change: 1 addition & 0 deletions test/src/algorithm/ssh_cipher_type_test.dart
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Expand Up @@ -106,6 +106,7 @@ void main() {
algorithms.kex,
equals([
SSHKexType.x25519,
SSHKexType.x25519Rfc,
SSHKexType.nistp521,
SSHKexType.nistp384,
SSHKexType.nistp256,
Expand Down