Supported SSH algorithms
Buru SFTP Server supports the SSH algorithms listed below. Algorithm selection can be configured via the ssh section in config.yaml.
| __MODERN (secure) | | |
|---|
mlkem768x25519-sha256 | 256 bits | 2.18.0 Hybrid post-quantum key exchange combining ML-KEM-768 with X25519 and SHA-256 |
mlkem768nistp256-sha256 | 256 bits | 2.18.0 Hybrid post-quantum key exchange combining ML-KEM-768 with NIST P-256 and SHA-256 |
mlkem1024nistp384-sha384 | 384 bits | 2.18.0 Hybrid post-quantum key exchange combining ML-KEM-1024 with NIST P-384 and SHA-384 |
curve25519-sha256 | 256 bits | Elliptic Curve Diffie-Hellman on Curve25519 with SHA-256 hash |
curve25519-sha256@libssh.org | 256 bits | Elliptic Curve Diffie-Hellman on Curve25519 with SHA-256 hash |
ecdh-sha2-nistp521 | 521 bits | Elliptic Curve Diffie Hellman with NIST P-521 curve and SHA-512 hash |
ecdh-sha2-nistp384 | 384 bits | Elliptic Curve Diffie Hellman with NIST P-384 curve and SHA-384 hash |
ecdh-sha2-nistp256 | 256 bits | Elliptic Curve Diffie Hellman with NIST P-256 curve and SHA-256 hash |
ecdh-sha2-1.3.132.0.10 | 256 bits | 2.11.0 Elliptic Curve Diffie Hellman with secp256k1 curve and SHA-256 hash. Supported on Windows 10+ and Windows Server 2016+. |
diffie-hellman-group18-sha512 | 8192 bits | 2.18.0 Diffie Hellman with MODP Group 18 and SHA-512 hash |
diffie-hellman-group17-sha512 | 6144 bits | 2.18.0 Diffie Hellman with MODP Group 17 and SHA-512 hash |
diffie-hellman-group16-sha512 | 4096 bits | Diffie Hellman with MODP Group 16 and SHA-512 hash |
diffie-hellman-group15-sha512 | 3072 bits | Diffie Hellman with MODP Group 15 and SHA-512 hash |
diffie-hellman-group-exchange-sha256 | Negotiated | Diffie Hellman with group exchange and SHA-256 hash |
| __INTERMEDIATE (best compatibility) | all of the above, plus: | |
|---|
diffie-hellman-group14-sha256 | 2048 bits | Diffie Hellman with MODP Group 14 and SHA-256 hash |
diffie-hellman-group14-sha1 | 2048 bits | Diffie Hellman with Oakley/MODP Group 14 and SHA-1 hash |
diffie-hellman-group-exchange-sha1 | Negotiated | Diffie Hellman with group exchange and SHA-1 hash |
| __ALL (insecure, not recommended) | all of the above, plus: | |
|---|
diffie-hellman-group1-sha1 | 1024 bits | Diffie Hellman with Oakley Group 2 and SHA-1 hash |
| __MODERN (secure) | |
|---|
ssh-ed25519 | Ed25519, an Edwards-curve Digital Signature Algorithm (EdDSA) |
ecdsa-sha2-nistp521 | Elliptic Curve Digital Signature Algorithm (ECDSA) on NIST P-521 curve with SHA-512 hash |
ecdsa-sha2-nistp384 | Elliptic Curve Digital Signature Algorithm (ECDSA) on NIST P-384 curve with SHA-384 hash |
ecdsa-sha2-nistp256 | Elliptic Curve Digital Signature Algorithm (ECDSA) on NIST P-256 curve with SHA-256 hash |
ecdsa-sha2-1.3.132.0.10 | 2.11.0 Elliptic Curve Digital Signature Algorithm (ECDSA) on secp256k1 curve with SHA-256 hash. Supported on Windows 10+ and Windows Server 2016+. |
rsa-sha2-512 | RSA with SHA-512 hash |
ssh-rsa-sha256@ssh.com | RSA with SHA-256 hash |
rsa-sha2-256 | RSA with SHA-256 hash |
x509v3-ecdsa-sha2-nistp521 | 2.10.0 X.509 certificate with ECDSA on NIST P-521 curve and SHA-2 hash |
x509v3-ecdsa-sha2-nistp384 | 2.10.0 X.509 certificate with ECDSA on NIST P-384 curve and SHA-2 hash |
x509v3-ecdsa-sha2-nistp256 | 2.10.0 X.509 certificate with ECDSA on NIST P-256 curve and SHA-2 hash |
x509v3-rsa2048-sha256 | 2.10.0 X.509 certificate with 2048+ bit RSA and SHA-256 hash |
x509v3-sign-rsa-sha256@ssh.com | 2.10.0 X.509 certificate with RSA and SHA-256 hash |
| __INTERMEDIATE (best compatibility) | all of the above, plus: |
|---|
ssh-dss | NIST Digital Signature Algorithm (DSA) with SHA-1 hash |
ssh-rsa | RSA with SHA-1 hash |
x509v3-sign-rsa | 2.10.0 X.509 certificate with RSA and SHA-1 hash |
x509v3-sign-dss | 2.10.0 X.509 certificate with DSA and SHA-1 hash |
| __ALL (insecure, not recommended) | all of the above |
| __MODERN (secure) | |
|---|
aes256-gcm@openssh.com | AES in GCM mode with 256-bit key |
aes128-gcm@openssh.com | AES in GCM mode with 128-bit key |
aes256-ctr | AES in CTR mode with 256-bit key |
aes192-ctr | AES in CTR mode with 192-bit key |
aes128-ctr | AES in CTR mode with 128-bit key |
chacha20-poly1305@openssh.com | ChaCha20/Poly1305 AEAD cipher with 256-bit key |
twofish256-ctr | Twofish in CTR mode with 256-bit key |
twofish192-ctr | Twofish in CTR mode with 192-bit key |
twofish128-ctr | Twofish in CTR mode with 128-bit key |
| __INTERMEDIATE (best compatibility) | all of the above, plus: |
|---|
aes256-cbc | AES in CBC mode with 256-bit key |
aes192-cbc | AES in CBC mode with 192-bit key |
aes128-cbc | AES in CBC mode with 128-bit key |
twofish256-cbc | Twofish in CBC mode with 256-bit key |
twofish192-cbc | Twofish in CBC mode with 192-bit key |
twofish128-cbc | Twofish in CBC mode with 128-bit key |
twofish-cbc | Twofish in CBC mode with 256-bit key |
3des-ctr | TripleDES in CTR mode |
3des-cbc | TripleDES in CBC mode |
| __ALL (insecure, not recommended) | all of the above, plus: |
|---|
arcfour256 | ArcFour (RC4) stream cipher (with discard step) with 256-bit key |
arcfour128 | ArcFour (RC4) stream cipher (with discard step) with 128-bit key |
arcfour | ArcFour (RC4) stream cipher with 128-bit key |
blowfish-ctr | Blowfish in CTR mode with 256-bit key |
blowfish-cbc | Blowfish in CBC mode with 128-bit key |
| __MODERN (secure) | |
|---|
hmac-sha2-512-etm@openssh.com | SHA-512 (ETM mode) |
hmac-sha2-256-etm@openssh.com | SHA-256 (ETM mode) |
hmac-sha2-512 | SHA-512 |
hmac-sha2-256 | SHA-256 |
| __INTERMEDIATE (best compatibility) | all of the above, plus: |
|---|
hmac-sha1 | SHA-1 |
hmac-sha1-96 | SHA-1 (trimmed to 96 bits) |
| __ALL (insecure, not recommended) | all of the above |
|---|
hmac-md5 | MD5 |
hmac-md5-96 | MD5 (trimmed to 96 bits) |
