diff --git a/.gitignore b/.gitignore
index ea8c4bf..f4117c0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 /target
+/test
diff --git a/Cargo.lock b/Cargo.lock
index cf9144e..7186b75 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,6 +2,58 @@
 # It is not intended for manual editing.
 version = 4
 
+[[package]]
+name = "adler2"
+version = "2.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "320119579fcad9c21884f5c4861d16174d0e06250625266f50fe6898340abefa"
+
+[[package]]
+name = "aead"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1973cfbc1a2daf9cf550e74e1f088c28e7f7d8c1e1418fb6c9dc5184b7e84c99"
+dependencies = [
+ "crypto-common",
+ "inout",
+]
+
+[[package]]
+name = "aes"
+version = "0.9.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f8eb277bec05f56a0e0591f155a484cbd0f4f07ff2905051a48c72f004f7ed58"
+dependencies = [
+ "cipher",
+ "cpubits",
+ "cpufeatures",
+ "zeroize",
+]
+
+[[package]]
+name = "aes-gcm"
+version = "0.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7f2b8006a0c83f52b62ba44a97b58bf76fe2f70a329e588f67f89691d93d498f"
+dependencies = [
+ "aead",
+ "aes",
+ "cipher",
+ "ctr",
+ "ctutils",
+ "ghash",
+ "zeroize",
+]
+
+[[package]]
+name = "android_system_properties"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ae221649c9976a6f6c56ae1facf410f3ddb33cc661c4b7b61020a912d4237fbc"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "anstream"
 version = "1.0.0"
@@ -38,7 +90,7 @@ version = "1.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "40c48f72fd53cd289104fc64099abca73db4166ad86ea0b4341abe65af83dadc"
 dependencies = [
- "windows-sys",
+ "windows-sys 0.61.2",
 ]
 
 [[package]]
@@ -49,7 +101,7 @@ checksum = "291e6a250ff86cd4a820112fb8898808a366d8f9f58ce16d1f538353ad55747d"
 dependencies = [
  "anstyle",
  "once_cell_polyfill",
- "windows-sys",
+ "windows-sys 0.61.2",
 ]
 
 [[package]]
@@ -58,12 +110,118 @@ version = "1.0.104"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "330a5ed07fa54e4702c9d6c4174f74427fc0ef6e214bbd677ae50a5099946470"
 
+[[package]]
+name = "argon2"
+version = "0.6.0-rc.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7af50940b73bf4e16c15c448a2b121c63f2d68e3e54b6a8731673cb4aa0cdff5"
+dependencies = [
+ "base64ct",
+ "blake2",
+ "cpufeatures",
+ "password-hash",
+]
+
+[[package]]
+name = "autocfg"
+version = "1.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f2032f911046de80f0a198e0901378627c33f59ea0ac00e363d481118bd70a53"
+
+[[package]]
+name = "base16ct"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fd307490d624467aa6f74b0eabb77633d1f758a7b25f12bceb0b22e08d9726f6"
+
+[[package]]
+name = "base64ct"
+version = "1.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2af50177e190e07a26ab74f8b1efbfe2ef87da2116221318cb1c2e82baf7de06"
+
+[[package]]
+name = "bcrypt-pbkdf"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "144e573728da132683b9488acd528274c790e07fc06ff81ee29f9d8f8b1041e0"
+dependencies = [
+ "blowfish",
+ "pbkdf2",
+ "sha2",
+]
+
 [[package]]
 name = "bitflags"
 version = "2.13.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b588b76d00fde79687d7646a9b5bdf3cc0f655e0bbd080335a95d7e96f3587da"
 
+[[package]]
+name = "blake2"
+version = "0.11.0-rc.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "061f1a09225e328e1ffbb378d2d49923c0ca5fee19fb5ac1cc9c1e9d52b93690"
+dependencies = [
+ "digest",
+]
+
+[[package]]
+name = "block-buffer"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d2f6c7dbe95a6ed67ad9f18e57daf93a2f034c524b99fd2b76d18fdfeb6660aa"
+dependencies = [
+ "hybrid-array",
+ "zeroize",
+]
+
+[[package]]
+name = "block-padding"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "710f1dd022ef4e93f8a438b4ba958de7f64308434fa6a87104481645cc30068b"
+dependencies = [
+ "hybrid-array",
+]
+
+[[package]]
+name = "blowfish"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "62ce3946557b35e71d1bbe07ec385073ce9eda05043f95de134eb578fcf1a298"
+dependencies = [
+ "byteorder",
+ "cipher",
+]
+
+[[package]]
+name = "bumpalo"
+version = "3.20.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72f5acc6cb2ba439de613abc23857ec3d78374d8ed5ac84e9d11336e87da8649"
+
+[[package]]
+name = "byteorder"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
+
+[[package]]
+name = "bytes"
+version = "1.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fc652a48c352aef3ea3aed32080501cf3ef6ed5da78602a020c991775b0aff04"
+
+[[package]]
+name = "cbc"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ce2dc9ee5f88d11e0beb842c88b33c8a5cf0d1329c4b19494af42b07dbfe8896"
+dependencies = [
+ "cipher",
+]
+
 [[package]]
 name = "cc"
 version = "1.4.4"
@@ -80,6 +238,50 @@ version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9330f8b2ff13f34540b44e946ef35111825727b38d33286ef986142615121801"
 
+[[package]]
+name = "cfg_aliases"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f079e83a288787bcd14a6aea84cee5c87a67c5a3e660c30f557a3d24761b3527"
+
+[[package]]
+name = "chacha20"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d524456ba66e72eb8b115ff89e01e497f8e6d11d78b70b1aa13c0fbd97540a81"
+dependencies = [
+ "cfg-if",
+ "cipher",
+ "cpufeatures",
+ "rand_core",
+ "zeroize",
+]
+
+[[package]]
+name = "chrono"
+version = "0.4.45"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1aa79e62e7697b8e29b513a68abacf485adcd1fe8284a4316c5ae868e6633327"
+dependencies = [
+ "iana-time-zone",
+ "js-sys",
+ "num-traits",
+ "wasm-bindgen",
+ "windows-link",
+]
+
+[[package]]
+name = "cipher"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e8cf2a2c93cd704877c0858356ed03480ff301ee950b43f1cbe4573b088bfa6c"
+dependencies = [
+ "block-buffer",
+ "crypto-common",
+ "inout",
+ "zeroize",
+]
+
 [[package]]
 name = "clap"
 version = "4.6.6"
@@ -111,7 +313,7 @@ dependencies = [
  "heck",
  "proc-macro2",
  "quote",
- "syn",
+ "syn 3.0.3",
 ]
 
 [[package]]
@@ -120,6 +322,12 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c8d4a3bb8b1e0c1050499d1815f5ab16d04f0959b233085fb31653fbfc9d98f9"
 
+[[package]]
+name = "cmov"
+version = "0.5.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c9ea0ac24bc397ab3c98583a3c9ba74fa56b09a4449bbe172b9b1ddb016027a"
+
 [[package]]
 name = "colorchoice"
 version = "1.0.5"
@@ -132,7 +340,177 @@ version = "3.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "faf9468729b8cbcea668e36183cb69d317348c2e08e994829fb56ebfdfbaac34"
 dependencies = [
- "windows-sys",
+ "windows-sys 0.61.2",
+]
+
+[[package]]
+name = "const-oid"
+version = "0.10.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a6ef517f0926dd24a1582492c791b6a4818a4d94e789a334894aa15b0d12f55c"
+
+[[package]]
+name = "core-foundation-sys"
+version = "0.8.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "773648b94d0e5d620f64f280777445740e61fe701025087ec8b57f45c791888b"
+
+[[package]]
+name = "cpubits"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "15b85f9c39137c3a891689859392b1bd49812121d0d61c9caf00d46ed5ce06ae"
+
+[[package]]
+name = "cpufeatures"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8b2a41393f66f16b0823bb79094d54ac5fbd34ab292ddafb9a0456ac9f87d201"
+dependencies = [
+ "libc",
+]
+
+[[package]]
+name = "crc32fast"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9481c1c90cbf2ac953f07c8d4a58aa3945c425b7185c9154d67a65e4230da511"
+dependencies = [
+ "cfg-if",
+]
+
+[[package]]
+name = "crypto-bigint"
+version = "0.7.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1a52aa3fcda4e6302a9f48734f234d35d4721b96f8fe07d073f07ce9df4f0271"
+dependencies = [
+ "cpubits",
+ "ctutils",
+ "getrandom 0.4.3",
+ "hybrid-array",
+ "num-traits",
+ "rand_core",
+ "serdect",
+ "subtle",
+ "zeroize",
+]
+
+[[package]]
+name = "crypto-common"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ce6e4c961d6cd6c9a86db418387425e8bdeaf05b3c8bc1411e6dca4c252f1453"
+dependencies = [
+ "getrandom 0.4.3",
+ "hybrid-array",
+ "rand_core",
+]
+
+[[package]]
+name = "crypto-primes"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3633a51a39c69ebbaa4feaa694bd83d241e4093901c84a0963b19d9bb3f0cf8f"
+dependencies = [
+ "crypto-bigint",
+ "rand_core",
+]
+
+[[package]]
+name = "ctr"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baaca1c4b237092596f64d571e9db6ce4109c4ef9742e27590f1709594461f21"
+dependencies = [
+ "cipher",
+]
+
+[[package]]
+name = "ctutils"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7d5515a3834141de9eafb9717ad39eea8247b5674e6066c404e8c4b365d2a29e"
+dependencies = [
+ "cmov",
+ "subtle",
+]
+
+[[package]]
+name = "curve25519-dalek"
+version = "5.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b5eed333089e2e1c1ac8c6c0398e5e2497b4c9926ca6d0365ed1e099afa5bc23"
+dependencies = [
+ "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
+ "digest",
+ "fiat-crypto",
+ "rand_core",
+ "rustc_version",
+ "subtle",
+ "zeroize",
+]
+
+[[package]]
+name = "curve25519-dalek-derive"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f46882e17999c6cc590af592290432be3bce0428cb0d5f8b6715e4dc7b383eb3"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.119",
+]
+
+[[package]]
+name = "data-encoding"
+version = "2.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4583a4551df46e2792f82ceeac45e850d2e2d5debba0b91f102385cda5b11f06"
+
+[[package]]
+name = "delegate"
+version = "0.13.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "780eb241654bf097afb00fc5f054a09b687dad862e485fdcf8399bb056565370"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.119",
+]
+
+[[package]]
+name = "der"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a69dedd701da44b0536442edf09c81a64b0ab97a7a4a5e3d1971f00027cbc63d"
+dependencies = [
+ "const-oid",
+ "pem-rfc7468",
+ "zeroize",
+]
+
+[[package]]
+name = "des"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "916a94e407b54f9034d71dd748234cd1e516ced6284009906ae246f177eafe5a"
+dependencies = [
+ "cipher",
+]
+
+[[package]]
+name = "digest"
+version = "0.11.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f1dd6dbb5841937940781866fa1281a1ff7bd3bf827091440879f9994983d5c2"
+dependencies = [
+ "block-buffer",
+ "const-oid",
+ "crypto-common",
+ "ctutils",
 ]
 
 [[package]]
@@ -153,7 +531,82 @@ dependencies = [
  "libc",
  "option-ext",
  "redox_users",
- "windows-sys",
+ "windows-sys 0.61.2",
+]
+
+[[package]]
+name = "ecdsa"
+version = "0.17.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c0681a4fc24c767085329728d8dfba959af91228aa4610cca4f8ce317ba46ae0"
+dependencies = [
+ "der",
+ "digest",
+ "elliptic-curve",
+ "rfc6979",
+ "signature",
+ "spki",
+ "zeroize",
+]
+
+[[package]]
+name = "ed25519"
+version = "3.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "29fcf32e6c73d1079f83ab4d782de2d81620346a5f38c6237a86a22f8368980a"
+dependencies = [
+ "pkcs8",
+ "signature",
+]
+
+[[package]]
+name = "ed25519-dalek"
+version = "3.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6ebaa1a2bf1290ab3bfe5a7b771d050ebffab2711c19a81691c683a5144a25de"
+dependencies = [
+ "curve25519-dalek",
+ "ed25519",
+ "rand_core",
+ "serde",
+ "sha2",
+ "signature",
+ "subtle",
+ "zeroize",
+]
+
+[[package]]
+name = "elliptic-curve"
+version = "0.14.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9d65aa39b3a5c1c9c1b745c9a019234bb7a21b77abcb4f4d266d706e2d577d65"
+dependencies = [
+ "base16ct",
+ "crypto-bigint",
+ "crypto-common",
+ "digest",
+ "ff",
+ "group",
+ "hkdf",
+ "hybrid-array",
+ "pem-rfc7468",
+ "pkcs8",
+ "rand_core",
+ "sec1",
+ "subtle",
+ "zeroize",
+]
+
+[[package]]
+name = "enum_dispatch"
+version = "0.3.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aa18ce2bc66555b3218614519ac839ddb759a7d6720732f979ef8d13be147ecd"
+dependencies = [
+ "once_cell",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.119",
 ]
 
 [[package]]
@@ -162,12 +615,147 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "877a4ace8713b0bcf2a4e7eec82529c029f1d0619886d18145fea96c3ffe5c0f"
 
+[[package]]
+name = "ff"
+version = "0.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a1f686ab92a9fb0eaf188f6c6c87b89490baa6fdb0db4544ba4dc47f7942489f"
+dependencies = [
+ "rand_core",
+ "subtle",
+]
+
+[[package]]
+name = "fiat-crypto"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "64cd1e32ddd350061ae6edb1b082d7c54915b5c672c389143b9a63403a109f24"
+
 [[package]]
 name = "find-msvc-tools"
 version = "0.1.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d45db016d36b838f563236e9193d0ee6ce38f3f68b6c94e914b4929c96bbb890"
 
+[[package]]
+name = "flate2"
+version = "1.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "843fba2746e448b37e26a819579957415c8cef339bf08564fe8b7ddbd959573c"
+dependencies = [
+ "crc32fast",
+ "miniz_oxide",
+]
+
+[[package]]
+name = "futures"
+version = "0.3.34"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a31d2a3fbaaeb2af2368bbdd904aa8e812d3c04a1ee10d3171f52d556e5d0a3"
+dependencies = [
+ "futures-channel",
+ "futures-core",
+ "futures-executor",
+ "futures-io",
+ "futures-sink",
+ "futures-task",
+ "futures-util",
+]
+
+[[package]]
+name = "futures-channel"
+version = "0.3.34"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b1f9e3d69d39e4862ffed03ed071a76f9a13ba1d9109d355b0f0aa6b15e393c4"
+dependencies = [
+ "futures-core",
+ "futures-sink",
+]
+
+[[package]]
+name = "futures-core"
+version = "0.3.34"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "92d699e522242e69e3003b94ecc1f960f3a5e015aa7c5d7486e65ad01dd94f5e"
+
+[[package]]
+name = "futures-executor"
+version = "0.3.34"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "031b47cf1a3c6cc8bc2fc76cd437f521619387907d469316e7c0bc278f1f5432"
+dependencies = [
+ "futures-core",
+ "futures-task",
+ "futures-util",
+]
+
+[[package]]
+name = "futures-io"
+version = "0.3.34"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "53c0fa8157de1303bfffdaa1cc2a673bfffb60102f76b0ef4441659124373fed"
+
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+ "core-foundation-sys",
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@@ -237,65 +979,122 @@ dependencies = [
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- "parking_lot_core",
+ "ecdsa",
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- "libc",
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- "smallvec",
- "windows-link",
+ "ecdsa",
+ "elliptic-curve",
+ "fiat-crypto",
+ "primefield",
+ "primeorder",
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+ "ring",
+ "rsa",
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+ "russh-util",
+ "salsa20",
+ "scrypt",
+ "sec1",
+ "sha1",
+ "sha2",
+ "sha3 0.12.0",
+ "signature",
+ "spki",
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+dependencies = [
+ "cfg-if",
+ "cipher",
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+
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 dependencies = [
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- "syn",
+ "syn 3.0.3",
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+ "cpufeatures",
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+ "keccak",
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- "libssh2-sys",
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+ "aes-gcm",
+ "chacha20",
+ "cipher",
+ "ctutils",
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+ "poly1305",
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+ "zeroize",
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+
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+dependencies = [
+ "base64ct",
+ "bytes",
+ "crypto-bigint",
+ "ctutils",
+ "digest",
+ "pem-rfc7468",
+ "zeroize",
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+
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+dependencies = [
+ "argon2",
+ "bcrypt-pbkdf",
+ "ctutils",
+ "ed25519-dalek",
+ "hex",
+ "hmac",
+ "p256",
+ "p384",
+ "p521",
+ "rand_core",
+ "rsa",
+ "sec1",
+ "sha1",
+ "sha2",
+ "signature",
+ "ssh-cipher",
+ "ssh-encoding",
+ "zeroize",
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 checksum = "7da8b5736845d9f2fcb837ea5d9e2628564b3b043a70948a3f0b778838c5fb4f"
 
+[[package]]
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+
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+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
 [[package]]
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@@ -495,7 +1822,33 @@ checksum = "bc04cd3e1236dd4a98afca4569f2deb3f120e5422a4023be2cb683f8486292af"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 3.0.3",
+]
+
+[[package]]
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+version = "1.53.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "202caea871b69668250d242070849eb495be178ed697a3e98aebce5bc81a0bed"
+dependencies = [
+ "bytes",
+ "libc",
+ "mio",
+ "pin-project-lite",
+ "socket2",
+ "tokio-macros",
+ "windows-sys 0.61.2",
+]
+
+[[package]]
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+checksum = "78773a2a397f451582ce068015985c33193cf6dea8b74d2a639fe457b2f07b0e"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 3.0.3",
 ]
 
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@@ -537,12 +1890,34 @@ version = "1.1.2+spec-1.1.0"
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 checksum = "7d56353a2a665ad0f41a421187180aab746c8c325620617ad883a99a1cbe66d2"
 
+[[package]]
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+checksum = "b6f5e870be6c3b371b77fe0ee0bafb859fa4964b4404c27de1d380043c4dda20"
+
 [[package]]
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+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f4987bdc12753382e0bec4a65c50738ffaabc998b9cdd1f952fb5f39b0048a96"
+dependencies = [
+ "crypto-common",
+ "ctutils",
+]
+
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+checksum = "8ecb6da28b8a351d773b68d5825ac39017e680750f980f3a1a85cd8dd28a47c1"
+
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@@ -550,10 +1925,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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+checksum = "0b928f33d975fc6ad9f86c8f283853ad26bdd5b10b7f1542aa2fa15e2289105a"
 
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+[[package]]
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+checksum = "1b70935747edd64d89de3efa29d73789b806c15798f8e7dca4d8ac356b50ce70"
+dependencies = [
+ "cfg-if",
+ "once_cell",
+ "rustversion",
+ "wasm-bindgen-macro",
+ "wasm-bindgen-shared",
+]
+
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+dependencies = [
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+ "wasm-bindgen",
+]
+
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "quote",
+ "wasm-bindgen-macro-support",
+]
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e11d33f857dc2fb11b8bc75aee111aa9cbeb12cd9f25efd3d4c2a3dd4e235284"
+dependencies = [
+ "bumpalo",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.119",
+ "wasm-bindgen-shared",
+]
+
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+checksum = "7ef64dbcc55df09c7e5a46182d181c2cfa3e925f3da937ea764728b4bbb9dcbf"
+dependencies = [
+ "unicode-ident",
+]
+
 [[package]]
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@@ -583,7 +2013,74 @@ version = "0.1.11"
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 checksum = "c2a7b1c03c876122aa43f3020e6c3c3ee5c05081c9a00739faf7503aeba10d22"
 dependencies = [
- "windows-sys",
+ "windows-sys 0.61.2",
+]
+
+[[package]]
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+version = "0.62.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "527fadee13e0c05939a6a05d5bd6eec6cd2e3dbd648b9f8e447c6518133d8580"
+dependencies = [
+ "windows-collections",
+ "windows-core",
+ "windows-future",
+ "windows-numerics",
+]
+
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+checksum = "23b2d95af1a8a14a3c7367e1ed4fc9c20e0a26e79551b1454d72583c97cc6610"
+dependencies = [
+ "windows-core",
+]
+
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+dependencies = [
+ "windows-implement",
+ "windows-interface",
+ "windows-link",
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+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e1d6f90251fe18a279739e78025bd6ddc52a7e22f921070ccdc67dde84c605cb"
+dependencies = [
+ "windows-core",
+ "windows-link",
+ "windows-threading",
+]
+
+[[package]]
+name = "windows-implement"
+version = "0.60.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "053e2e040ab57b9dc951b72c264860db7eb3b0200ba345b4e4c3b14f67855ddf"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.119",
+]
+
+[[package]]
+name = "windows-interface"
+version = "0.59.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f316c4a2570ba26bbec722032c4099d8c8bc095efccdc15688708623367e358"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.119",
 ]
 
 [[package]]
@@ -592,6 +2089,43 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0805222e57f7521d6a62e36fa9163bc891acd422f971defe97d64e70d0a4fe5"
 
+[[package]]
+name = "windows-numerics"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6e2e40844ac143cdb44aead537bbf727de9b044e107a0f1220392177d15b0f26"
+dependencies = [
+ "windows-core",
+ "windows-link",
+]
+
+[[package]]
+name = "windows-result"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7781fa89eaf60850ac3d2da7af8e5242a5ea78d1a11c49bf2910bb5a73853eb5"
+dependencies = [
+ "windows-link",
+]
+
+[[package]]
+name = "windows-strings"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7837d08f69c77cf6b07689544538e017c1bfcf57e34b4c0ff58e6c2cd3b37091"
+dependencies = [
+ "windows-link",
+]
+
+[[package]]
+name = "windows-sys"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "282be5f36a8ce781fad8c8ae18fa3f9beff57ec1b52cb3de0789201425d9a33d"
+dependencies = [
+ "windows-targets",
+]
+
 [[package]]
 name = "windows-sys"
 version = "0.61.2"
@@ -601,12 +2135,96 @@ dependencies = [
  "windows-link",
 ]
 
+[[package]]
+name = "windows-targets"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9b724f72796e036ab90c1021d4780d4d3d648aca59e491e6b98e725b84e99973"
+dependencies = [
+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_gnullvm",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
+name = "windows-threading"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3949bd5b99cafdf1c7ca86b43ca564028dfe27d66958f2470940f73d86d75b37"
+dependencies = [
+ "windows-link",
+]
+
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "32a4622180e7a0ec044bb555404c800bc9fd9ec262ec147edd5989ccd0c02cd3"
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "09ec2a7bb152e2252b53fa7803150007879548bc709c039df7627cabbd05d469"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e9b5ad5ab802e97eb8e295ac6720e509ee4c243f69d781394014ebfe8bbfa0b"
+
+[[package]]
+name = "windows_i686_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0eee52d38c090b3caa76c563b86c3a4bd71ef1a819287c19d586d7334ae8ed66"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
+
 [[package]]
 name = "winnow"
 version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "23b97319f7b8343df12cc98938e5c3eb436064524c8d2b4e30a1d3a36eecdf81"
 
+[[package]]
+name = "wnaf"
+version = "0.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ab12e7090f27e2ffd9322651492942d50c2926094af30601e1964337db39daf1"
+dependencies = [
+ "ff",
+ "group",
+ "hybrid-array",
+]
+
 [[package]]
 name = "xboctploy"
 version = "0.1.0"
@@ -615,9 +2233,16 @@ dependencies = [
  "clap",
  "colored",
  "home",
+ "russh",
  "serde",
- "ssh2",
  "ssh2-config",
+ "tokio",
  "toml",
  "walkdir",
 ]
+
+[[package]]
+name = "zeroize"
+version = "1.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e13c156562582aa81c60cb29407084cdb54c4164760106ab78e6c5b0858cf64e"
diff --git a/Cargo.toml b/Cargo.toml
index d927a64..f39f944 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,8 +8,9 @@ anyhow = "1.0.104"
 clap = { version = "4.6.6", features = ["derive"] }
 colored = "3.1.1"
 home = "0.5.12"
+russh = { version = "0.62.7", default-features = false, features = ["ring", "rsa", "flate2"] }
 serde = { version = "1.0.229", features = ["derive"] }
-ssh2 = "0.9.6"
 ssh2-config = "0.7.2"
+tokio = { version = "1.53.1", features = ["rt", "time", "io-util"] }
 toml = "1.1.4"
 walkdir = "2.5.0"
diff --git a/docs/pdr-adr.md b/docs/pdr-adr.md
index c5546b6..64e8cbb 100644
--- a/docs/pdr-adr.md
+++ b/docs/pdr-adr.md
@@ -60,6 +60,12 @@
 - Решение: Реализовать стратегию Fail-Fast с выводом stderr упавшей команды. Идемпотентность (как в Ansible) на первом этапе не реализуется.
 - Обоснование: Для хобби-проекта проверка состояния системы перед каждым шагом (идемпотентность) избыточна и сильно усложнит архитектуру. Если команда упала, пользователь просто фиксит ошибку и запускает деплой заново.
 
+## ADR-006: Замена ssh2 (libssh2) на russh в качестве SSH-транспорта
+
+- Решение: Вместо крейта ssh2 (обёртка над libssh2) используется чисто Rust-овый russh (0.62.x, crypto-backend ring). Парсер ~/.ssh/config остаётся на ssh2-config (он не зависит от libssh2). Публичный API утилиты синхронный (ADR-003); tokio-runtime живёт внутри модуля ssh и наружу не торчит.
+- Обоснование: libssh2 не поддерживает шифр `chacha20-poly1305@openssh.com`, а свежие OpenSSH-серверы (9.x/10.x, в т.ч. дефолтные Ubuntu) часто предлагают только его — подключение падает с Session(-5). Утилита обязана работать с любым стоковым сервером без правки sshd_config. russh умеет chacha20-poly1305, aes-gcm и современные KEX (включая post-quantum гибриды).
+- Следствия: проверка host key реализована через TOFU поверх ~/.ssh/known_hosts средствами russh; ssh-agent (этап 6) доступен через встроенные agent-возможности russh; сборка не требует NASM/CMake (в отличие от aws-lc-rs дефолта russh 0.63, поэтому зафиксирован backend ring).
+
 ---
 
 ## 📈 План развития проекта (Roadmap)
diff --git a/justfile b/justfile
new file mode 100644
index 0000000..1f12cf1
--- /dev/null
+++ b/justfile
@@ -0,0 +1,16 @@
+config := "test/deploy.toml"
+project := "github-tracker"
+
+default:
+    @just --list
+
+build:
+    cargo build
+
+run *args:
+    cargo run -- --config {{config}} {{project}} {{args}}
+
+test:
+    cargo fmt --check
+    cargo clippy --all-targets -- -D warnings
+    cargo test
diff --git a/src/config.rs b/src/config.rs
index 48e6af0..f5f15ca 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -20,8 +20,7 @@ pub struct Project {
     pub workdir: PathBuf,
     pub host: String,
     pub user: Option<String>,
-    #[serde(default = "default_port")]
-    pub port: u16,
+    pub port: Option<u16>,
     pub key_path: Option<PathBuf>,
     #[serde(default)]
     pub local: Option<Commands>,
@@ -31,10 +30,6 @@ pub struct Project {
     pub remote: Option<Commands>,
 }
 
-fn default_port() -> u16 {
-    22
-}
-
 #[derive(Debug, Deserialize)]
 #[serde(deny_unknown_fields)]
 pub struct Commands {
@@ -157,7 +152,7 @@ commands = ["pm2 restart web"]
     fn valid_config_parses_with_defaults() {
         let cfg = parse(VALID).unwrap();
         let web = cfg.projects.get("web").unwrap();
-        assert_eq!(web.port, 22);
+        assert_eq!(web.port, None);
         assert!(web.user.is_none());
         assert_eq!(
             web.local.as_ref().unwrap().commands,
diff --git a/src/main.rs b/src/main.rs
index 735e119..efa4387 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,6 +1,7 @@
 mod cli;
 mod config;
 mod local;
+mod ssh;
 
 use std::process::ExitCode;
 
@@ -42,8 +43,8 @@ fn run(cli: &cli::Cli) -> Result<()> {
         .with_context(|| format!("project '{name}' not found in {}", path.display()))?;
 
     let target = match &project.user {
-        Some(user) => format!("{user}@{}:{}", project.host, project.port),
-        None => format!("{}:{}", project.host, project.port),
+        Some(user) => format!("{user}@{}:{}", project.host, project.port.unwrap_or(22)),
+        None => format!("{}:{}", project.host, project.port.unwrap_or(22)),
     };
     println!(
         "deploying '{name}' to {target}: {} local cmd(s), {} sync rule(s), {} remote cmd(s)",
@@ -78,11 +79,28 @@ fn run(cli: &cli::Cli) -> Result<()> {
     } else {
         local::run_commands(local_cmds, &project.workdir)?;
         println!("[Local] done: {} cmd(s) succeeded", local_cmds.len());
+
+        let needs_session = !project.sync.is_empty() || !remote_cmds.is_empty();
+        let mut session = None;
+        if needs_session {
+            let target = ssh::Target {
+                host_alias: project.host.clone(),
+                user: project.user.clone(),
+                port: project.port,
+                key_path: project.key_path.clone(),
+            };
+            let resolved = ssh::resolve(&target)?;
+            session = Some(ssh::connect(&resolved)?);
+        }
+
         if !project.sync.is_empty() {
             println!("stage 4 not implemented yet: SFTP file transfer");
         }
-        if !remote_cmds.is_empty() {
-            println!("stage 3 not implemented yet: SSH remote execution");
+        if let Some(session) = session.as_mut() {
+            for cmd in remote_cmds {
+                session.exec(cmd)?;
+            }
+            println!("[Remote] done: {} cmd(s) succeeded", remote_cmds.len());
         }
     }
     Ok(())
diff --git a/src/ssh.rs b/src/ssh.rs
new file mode 100644
index 0000000..36c2c68
--- /dev/null
+++ b/src/ssh.rs
@@ -0,0 +1,352 @@
+use std::fs::File;
+use std::path::PathBuf;
+use std::sync::{Arc, OnceLock};
+
+use anyhow::{Context, Result, bail};
+use russh::ChannelMsg;
+use russh::client::{self, AuthResult, Handle};
+use russh::keys::known_hosts;
+use russh::keys::{PrivateKeyWithHashAlg, PublicKey, load_secret_key};
+use ssh2_config::{HostParams, ParseRule, SshConfig};
+
+pub struct Target {
+    pub host_alias: String,
+    pub user: Option<String>,
+    pub port: Option<u16>,
+    pub key_path: Option<PathBuf>,
+}
+
+#[derive(Debug, Default)]
+struct HostConfig {
+    host_name: Option<String>,
+    user: Option<String>,
+    port: Option<u16>,
+    identity_file: Option<Vec<PathBuf>>,
+}
+
+impl From<HostParams> for HostConfig {
+    fn from(params: HostParams) -> Self {
+        Self {
+            host_name: params.host_name,
+            user: params.user,
+            port: params.port,
+            identity_file: params.identity_file,
+        }
+    }
+}
+
+#[derive(Debug)]
+pub struct Resolved {
+    pub host: String,
+    pub port: u16,
+    pub user: String,
+    pub key_path: PathBuf,
+}
+
+fn resolve_with(
+    target: &Target,
+    ssh_cfg: &HostConfig,
+    fallback_user: Option<&str>,
+) -> Result<Resolved> {
+    let host = ssh_cfg
+        .host_name
+        .clone()
+        .unwrap_or_else(|| target.host_alias.clone());
+    let port = target.port.or(ssh_cfg.port).unwrap_or(22);
+    let user = target
+        .user
+        .clone()
+        .or_else(|| ssh_cfg.user.clone())
+        .or_else(|| fallback_user.map(str::to_string))
+        .context("cannot determine SSH user: set 'user' in deploy.toml or ~/.ssh/config")?;
+    let key_path = target
+        .key_path
+        .clone()
+        .or_else(|| {
+            ssh_cfg
+                .identity_file
+                .as_ref()
+                .and_then(|files| files.first().cloned())
+        })
+        .unwrap_or_else(default_key);
+    Ok(Resolved {
+        host,
+        port,
+        user,
+        key_path,
+    })
+}
+
+pub fn resolve(target: &Target) -> Result<Resolved> {
+    resolve_with(
+        target,
+        &query_ssh_config(&target.host_alias),
+        env_user().as_deref(),
+    )
+}
+
+fn default_key() -> PathBuf {
+    home::home_dir()
+        .unwrap_or_else(|| PathBuf::from("."))
+        .join(".ssh")
+        .join("id_rsa")
+}
+
+fn env_user() -> Option<String> {
+    std::env::var("USERNAME")
+        .or_else(|_| std::env::var("USER"))
+        .ok()
+}
+
+fn ssh_config_path() -> Option<PathBuf> {
+    let path = home::home_dir()?.join(".ssh").join("config");
+    path.is_file().then_some(path)
+}
+
+fn query_ssh_config(alias: &str) -> HostConfig {
+    let Some(path) = ssh_config_path() else {
+        return HostConfig::default();
+    };
+    let file = match File::open(&path) {
+        Ok(file) => file,
+        Err(_) => return HostConfig::default(),
+    };
+    let mut reader = std::io::BufReader::new(file);
+    match SshConfig::default().parse(&mut reader, ParseRule::ALLOW_UNKNOWN_FIELDS) {
+        Ok(config) => config.query(alias).into(),
+        Err(err) => {
+            eprintln!("warning: cannot parse {}: {err}", path.display());
+            HostConfig::default()
+        }
+    }
+}
+
+struct ClientHandler {
+    host: String,
+    port: u16,
+}
+
+impl client::Handler for ClientHandler {
+    type Error = russh::Error;
+
+    async fn check_server_key(&mut self, server_key: &PublicKey) -> Result<bool, Self::Error> {
+        let key = server_key;
+        match known_hosts::check_known_hosts(&self.host, self.port, key) {
+            Ok(true) => Ok(true),
+            Ok(false) => {
+                eprintln!(
+                    "note: '{}' is not in known_hosts yet - trusting and remembering it (TOFU)",
+                    format_host_port(&self.host, self.port)
+                );
+                if let Err(err) = known_hosts::learn_known_hosts(&self.host, self.port, key) {
+                    eprintln!("warning: could not update known_hosts: {err}");
+                }
+                Ok(true)
+            }
+            Err(russh::keys::Error::KeyChanged { line }) => {
+                eprintln!(
+                    "SECURITY WARNING: host key for '{}' changed (known_hosts line {})! \
+                     If this is expected (VPS reinstall), remove that line from \
+                     ~/.ssh/known_hosts and retry.",
+                    format_host_port(&self.host, self.port),
+                    line + 1
+                );
+                Ok(false)
+            }
+            Err(other) => {
+                eprintln!("warning: cannot verify known_hosts entry: {other}");
+                Ok(false)
+            }
+        }
+    }
+}
+
+fn format_host_port(host: &str, port: u16) -> String {
+    if port == 22 {
+        host.to_string()
+    } else {
+        format!("[{host}]:{port}")
+    }
+}
+
+pub struct Session {
+    handle: Handle<ClientHandler>,
+}
+
+fn runtime() -> &'static tokio::runtime::Runtime {
+    static RT: OnceLock<tokio::runtime::Runtime> = OnceLock::new();
+    RT.get_or_init(|| {
+        tokio::runtime::Builder::new_current_thread()
+            .enable_all()
+            .build()
+            .expect("failed to start async runtime for SSH")
+    })
+}
+
+pub fn connect(resolved: &Resolved) -> Result<Session> {
+    println!(
+        "connecting to {}@{} (key {}) ...",
+        resolved.user,
+        format_host_port(&resolved.host, resolved.port),
+        resolved.key_path.display()
+    );
+    runtime().block_on(async {
+        let handler = ClientHandler {
+            host: resolved.host.clone(),
+            port: resolved.port,
+        };
+        let mut handle = client::connect(
+            Arc::new(client::Config::default()),
+            (resolved.host.as_str(), resolved.port),
+            handler,
+        )
+        .await
+        .with_context(|| {
+            format!(
+                "SSH connection/handshake with {} failed",
+                format_host_port(&resolved.host, resolved.port)
+            )
+        })?;
+        authenticate(&mut handle, resolved).await?;
+        Ok(Session { handle })
+    })
+}
+
+async fn authenticate(handle: &mut Handle<ClientHandler>, r: &Resolved) -> Result<()> {
+    let secret = load_secret_key(&r.key_path, None).map_err(|err| {
+        anyhow::anyhow!(
+            "cannot load private key {}: {err} (passphrase-protected keys are not supported yet)",
+            r.key_path.display()
+        )
+    })?;
+    let best_hash = handle
+        .best_supported_rsa_hash()
+        .await
+        .ok()
+        .flatten()
+        .flatten();
+    let key_alg = PrivateKeyWithHashAlg::new(Arc::new(secret), best_hash);
+    match handle
+        .authenticate_publickey(&r.user, key_alg)
+        .await
+        .context("publickey authentication exchange failed")?
+    {
+        AuthResult::Success => Ok(()),
+        AuthResult::Failure { .. } => bail!(
+            "SSH auth rejected for '{}' using key {} (is the public part in authorized_keys on the VPS?)",
+            r.user,
+            r.key_path.display()
+        ),
+    }
+}
+
+impl Session {
+    pub fn exec(&mut self, cmd: &str) -> Result<()> {
+        println!("[Remote] running: {cmd} ...");
+        runtime().block_on(async {
+            use std::io::Write;
+
+            let mut channel = self
+                .handle
+                .channel_open_session()
+                .await
+                .context("failed to open SSH channel")?;
+            channel
+                .exec(true, cmd)
+                .await
+                .with_context(|| format!("failed to start '{cmd}' on the remote host"))?;
+
+            let mut status: Option<u32> = None;
+            let mut stderr = String::new();
+            while let Some(msg) = channel.wait().await {
+                match msg {
+                    ChannelMsg::Data { data } => {
+                        print!("{}", String::from_utf8_lossy(&data));
+                        let _ = std::io::stdout().flush();
+                    }
+                    ChannelMsg::ExtendedData { data, ext: 1 } => {
+                        stderr.push_str(&String::from_utf8_lossy(&data));
+                    }
+                    ChannelMsg::ExitStatus { exit_status } => status = Some(exit_status),
+                    _ => {}
+                }
+            }
+
+            let status =
+                status.context("remote command finished without reporting an exit status")?;
+            if status != 0 {
+                let tail = if stderr.trim().is_empty() {
+                    String::new()
+                } else {
+                    format!("\nstderr:\n{stderr}")
+                };
+                bail!("[Remote] running: {cmd} ... FAILED (exit code {status}){tail}");
+            }
+            Ok(())
+        })
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn target(user: Option<&str>, port: Option<u16>) -> Target {
+        Target {
+            host_alias: "my-vps".into(),
+            user: user.map(str::to_string),
+            port,
+            key_path: None,
+        }
+    }
+
+    #[test]
+    fn explicit_values_override_ssh_config() {
+        let hc = HostConfig {
+            host_name: Some("10.0.0.5".into()),
+            user: Some("cfg-user".into()),
+            port: Some(2222),
+            identity_file: Some(vec![PathBuf::from("/cfg/key")]),
+        };
+        let t = Target {
+            host_alias: "my-vps".into(),
+            user: Some("toml-user".into()),
+            port: Some(2200),
+            key_path: Some(PathBuf::from("~/custom_key")),
+        };
+        let r = resolve_with(&t, &hc, Some("os-user")).unwrap();
+        assert_eq!(r.user, "toml-user");
+        assert_eq!(r.port, 2200);
+        assert!(r.key_path.starts_with("~"));
+    }
+
+    #[test]
+    fn ssh_config_fills_gaps() {
+        let hc = HostConfig {
+            host_name: Some("10.0.0.5".into()),
+            user: Some("cfg-user".into()),
+            port: Some(2222),
+            identity_file: Some(vec![PathBuf::from("/cfg/key")]),
+        };
+        let r = resolve_with(&target(None, None), &hc, Some("os-user")).unwrap();
+        assert_eq!(r.host, "10.0.0.5");
+        assert_eq!(r.user, "cfg-user");
+        assert_eq!(r.port, 2222);
+        assert_eq!(r.key_path, PathBuf::from("/cfg/key"));
+    }
+
+    #[test]
+    fn defaults_when_nothing_configured() {
+        let r = resolve_with(&target(None, None), &HostConfig::default(), Some("os-user")).unwrap();
+        assert_eq!(r.host, "my-vps");
+        assert_eq!(r.user, "os-user");
+        assert_eq!(r.port, 22);
+        assert!(r.key_path.ends_with(".ssh/id_rsa"));
+    }
+
+    #[test]
+    fn missing_user_everywhere_is_clear_error() {
+        let err = resolve_with(&target(None, None), &HostConfig::default(), None).unwrap_err();
+        assert!(err.to_string().contains("set 'user'"), "{err:#}");
+    }
+}