Popularity

3.6

Stable

Activity

5.2

Stars 276

Watchers 12

Forks 48

Last Commit 8 months ago

Code Quality Rank: L5

Monthly Downloads: 146,552

Programming language: Ruby

License: MIT License

Tags: DevOps Tools Projects

Latest version: v2.0.0

SSHKey alternatives and similar gems

Based on the "DevOps Tools" category.
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* Code Quality Rankings and insights are calculated and provided by Lumnify.
They vary from L1 to L5 with "L5" being the highest.

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README

SSHKey

Generate private and public SSH keys (RSA and DSA supported) using pure Ruby.

Requirements

Tested / supported on CRuby 2.0.0+ and JRuby.

Installation

gem install sshkey

Usage

Generate a new key

When generating a new keypair the default key type is 2048-bit RSA, but you can supply the type (RSA or DSA) and bits in the options. You can also (optionally) supply a comment or passphrase.

k = SSHKey.generate

k = SSHKey.generate(
  type:       "DSA",
  bits:       1024,
  comment:    "[email protected]",
  passphrase: "foobar"
)

Use your existing key

Return an SSHKey object from an existing RSA or DSA private key (provided as a string).

f = File.read(File.expand_path("~/.ssh/id_rsa"))
k = SSHKey.new(f, comment: "[email protected]")

The SSHKey object

Private and public keys

Fetch the private and public keys as strings. Note that the public_key is the RSA or DSA public key, not an SSH public key.

k.private_key
# => "-----BEGIN RSA PRIVATE KEY-----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\nfG7co6mKUGkFPtr48EMfeKY88BRsp3yGOsROGdDsCHItjOVH\n-----END RSA PRIVATE KEY-----\n"

k.public_key
# => "-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAvR7l72CT7UBP6P+02Iut\n8gKKbKyekz/pQxnckPp1VafuaIwCMvYfP4ffVJTcY5IhU9mISNxZf6YDQ0TuD1aO\nrZYG9wsIgGY0nXhOUZxe/Q5I+V7DOI/hSzKF7W0cNCvaJPUSo8+soCLNSQ5mjnV3\nsRZ6uJwGFN30i1GulqHHKkx3vGxbiaAL9YG58dPSbPGHFTA/epqUyd1fzCuWHyL9\ndHW7aw4RroNyEtVdiftAQfaK20I2ueeDfuEtCPaxQYFQqbz5kKnXQx3fwHRpC7/8\n4xHxsrY576evGxHw4p5EJD37scNNcneTG3Ly79/VVSAlrSm6ltutx0+S70scCqK0\newIDAQAB\n-----END PUBLIC KEY-----\n"

Fetch the SSH public key as a string.

k.ssh_public_key
# => "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC9HuXvYJPtQE/o/7TYi63yAopsrJ6TP+lDGdyQ+nVVp+5ojAIy9h8/h99UlNxjkiFT2YhI3Fl/pgNDRO4PVo6tlgb3CwiAZjSdeE5RnF79Dkj5XsM4j+FLMoXtbRw0K9ok9RKjz6ygIs1JDmaOdXexFnq4nAYU3fSLUa6WoccqTHe8bFuJoAv1gbnx09Js8YcVMD96mpTJ3V/MK5YfIv10dbtrDhGug3IS1V2J+0BB9orbQja554N+4S0I9rFBgVCpvPmQqddDHd/AdGkLv/zjEfGytjnvp68bEfDinkQkPfuxw01yd5MbcvLv39VVICWtKbqW263HT5LvSxwKorR7"

Encryption

If a passphrase is set when a key is generated or by setting the passphrase accessor, you can fetch the encrypted version of the private key.

k.passphrase = "foo"
# => "foo"

k.encrypted_private_key
# => "-----BEGIN RSA PRIVATE KEY-----\nProc-Type: 4,ENCRYPTED\nDEK-Info: AES-128-CBC,748B766CFB185C3BD1D7E4D31113EBDA\n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\n-----END RSA PRIVATE KEY-----\n"

Comments

Keys can optionally have a comment that is shown as part of the public SSH key. Get or set the key's comment with the comment accessor.

k.comment
# => nil

k.comment = "[email protected]"
# => "[email protected]"

k.ssh_public_key
# => "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC9HuXvYJPtQE/o/7TYi63yAopsrJ6TP+lDGdyQ+nVVp+5ojAIy9h8/h99UlNxjkiFT2YhI3Fl/pgNDRO4PVo6tlgb3CwiAZjSdeE5RnF79Dkj5XsM4j+FLMoXtbRw0K9ok9RKjz6ygIs1JDmaOdXexFnq4nAYU3fSLUa6WoccqTHe8bFuJoAv1gbnx09Js8YcVMD96mpTJ3V/MK5YfIv10dbtrDhGug3IS1V2J+0BB9orbQja554N+4S0I9rFBgVCpvPmQqddDHd/AdGkLv/zjEfGytjnvp68bEfDinkQkPfuxw01yd5MbcvLv39VVICWtKbqW263HT5LvSxwKorR7 [email protected]"

k.ssh2_public_key
# => "---- BEGIN SSH2 PUBLIC KEY ----\nComment: [email protected]\nAAAAB3NzaC1yc2EAAAADAQABAAABAQC9HuXvYJPtQE/o/7TYi63yAopsrJ6TP+lDGdyQ+n\nVVp+5ojAIy9h8/h99UlNxjkiFT2YhI3Fl/pgNDRO4PVo6tlgb3CwiAZjSdeE5RnF79Dkj5\nXsM4j+FLMoXtbRw0K9ok9RKjz6ygIs1JDmaOdXexFnq4nAYU3fSLUa6WoccqTHe8bFuJoA\nv1gbnx09Js8YcVMD96mpTJ3V/MK5YfIv10dbtrDhGug3IS1V2J+0BB9orbQja554N+4S0I\n9rFBgVCpvPmQqddDHd/AdGkLv/zjEfGytjnvp68bEfDinkQkPfuxw01yd5MbcvLv39VVIC\nWtKbqW263HT5LvSxwKorR7\n---- END SSH2 PUBLIC KEY ----"

Bit length

Determine the strength of the key in bits as an integer.

k.bits
# => 2048

Fingerprints

It is often helpful to use a fingerprint to visually or programmatically check if one key matches another. Fetch an MD5, SHA1, or SHA256 fingerprint of the SSH public key.

k.md5_fingerprint
# => "04:1b:d4:18:df:87:60:94:8c:83:8a:7b:5a:35:59:3d"

k.sha1_fingerprint
# => "e5:c2:43:9e:e4:0c:0c:47:82:7a:3b:e9:61:13:bd:9c:43:eb:4c:b7"

k.sha256_fingerprint
# => "x1GEnx1SRY/QwxjMAoyO6mhQlaBedDHtYLEmfeUXy3o="

Public Key Directives

Add optional directives prefixed to the public key that will be enforced when a key is authenticated.

Accepts a string or an array of strings.

k.directives = "no-pty"
# => ["no-pty"]

k.directives = [
  "no-port-forwarding",
  "no-X11-forwarding",
  "no-agent-forwarding",
  "no-pty",
  "command='/home/user/bin/authprogs'"
]
# => ["no-port-forwarding", "no-X11-forwarding", "no-agent-forwarding", "no-pty", "command='/home/user/bin/authprogs'"]

k.ssh_public_key
# => "no-port-forwarding,no-X11-forwarding,no-agent-forwarding,no-pty,command='/home/user/bin/authprogs' ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC9HuXvYJPtQE/o/7TYi63yAopsrJ6TP+lDGdyQ+nVVp+5ojAIy9h8/h99UlNxjkiFT2YhI3Fl/pgNDRO4PVo6tlgb3CwiAZjSdeE5RnF79Dkj5XsM4j+FLMoXtbRw0K9ok9RKjz6ygIs1JDmaOdXexFnq4nAYU3fSLUa6WoccqTHe8bFuJoAv1gbnx09Js8YcVMD96mpTJ3V/MK5YfIv10dbtrDhGug3IS1V2J+0BB9orbQja554N+4S0I9rFBgVCpvPmQqddDHd/AdGkLv/zjEfGytjnvp68bEfDinkQkPfuxw01yd5MbcvLv39VVICWtKbqW263HT5LvSxwKorR7"

Randomart

Generate OpenSSH compatible ASCII art fingerprints.

puts k.randomart
+--[ RSA 2048]----+
|o+ o..           |
|..+.o            |
| ooo             |
|.++. o           |
|+o+ +   S        |
|.. + o .         |
|  . + .          |
|   . .           |
|    Eo.          |
+-----------------+

Original OpenSSL key object

Return the original OpenSSL::PKey::RSA or OpenSSL::PKey::DSA object.

k.key_object
# => -----BEGIN RSA PRIVATE KEY-----\nMIIEowI...

Existing SSH public keys

Validation

Determine if a given SSH public key is valid. Very useful to test user input of public keys to make sure they accurately copy/pasted the key. Just pass the SSH public key as a string. Returns false if the key is invalid.

SSHKey.valid_ssh_public_key? "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC9HuXvYJPtQE/o/7TYi63yAopsrJ6TP+lDGdyQ+nVVp+5ojAIy9h8/h99UlNxjkiFT2YhI3Fl/pgNDRO4PVo6tlgb3CwiAZjSdeE5RnF79Dkj5XsM4j+FLMoXtbRw0K9ok9RKjz6ygIs1JDmaOdXexFnq4nAYU3fSLUa6WoccqTHe8bFuJoAv1gbnx09Js8YcVMD96mpTJ3V/MK5YfIv10dbtrDhGug3IS1V2J+0BB9orbQja554N+4S0I9rFBgVCpvPmQqddDHd/AdGkLv/zjEfGytjnvp68bEfDinkQkPfuxw01yd5MbcvLv39VVICWtKbqW263HT5LvSxwKorR7"
# => true

Bit length

Determine the strength of the key in bits as an integer. Returns SSHKey::PublicKeyError if bits cannot be determined.

SSHKey.ssh_public_key_bits "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC9HuXvYJPtQE/o/7TYi63yAopsrJ6TP+lDGdyQ+nVVp+5ojAIy9h8/h99UlNxjkiFT2YhI3Fl/pgNDRO4PVo6tlgb3CwiAZjSdeE5RnF79Dkj5XsM4j+FLMoXtbRw0K9ok9RKjz6ygIs1JDmaOdXexFnq4nAYU3fSLUa6WoccqTHe8bFuJoAv1gbnx09Js8YcVMD96mpTJ3V/MK5YfIv10dbtrDhGug3IS1V2J+0BB9orbQja554N+4S0I9rFBgVCpvPmQqddDHd/AdGkLv/zjEfGytjnvp68bEfDinkQkPfuxw01yd5MbcvLv39VVICWtKbqW263HT5LvSxwKorR7"
# => 2048

Fingerprints

Fetch an MD5, SHA1, or SHA256 fingerprint of the SSH public key. Returns SSHKey::PublicKeyError if a fingerprint cannot be determined.

SSHKey.fingerprint "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC9HuXvYJPtQE/o/7TYi63yAopsrJ6TP+lDGdyQ+nVVp+5ojAIy9h8/h99UlNxjkiFT2YhI3Fl/pgNDRO4PVo6tlgb3CwiAZjSdeE5RnF79Dkj5XsM4j+FLMoXtbRw0K9ok9RKjz6ygIs1JDmaOdXexFnq4nAYU3fSLUa6WoccqTHe8bFuJoAv1gbnx09Js8YcVMD96mpTJ3V/MK5YfIv10dbtrDhGug3IS1V2J+0BB9orbQja554N+4S0I9rFBgVCpvPmQqddDHd/AdGkLv/zjEfGytjnvp68bEfDinkQkPfuxw01yd5MbcvLv39VVICWtKbqW263HT5LvSxwKorR7"
# => "04:1b:d4:18:df:87:60:94:8c:83:8a:7b:5a:35:59:3d"
SSHKey.sha1_fingerprint "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC9HuXvYJPtQE/o/7TYi63yAopsrJ6TP+lDGdyQ+nVVp+5ojAIy9h8/h99UlNxjkiFT2YhI3Fl/pgNDRO4PVo6tlgb3CwiAZjSdeE5RnF79Dkj5XsM4j+FLMoXtbRw0K9ok9RKjz6ygIs1JDmaOdXexFnq4nAYU3fSLUa6WoccqTHe8bFuJoAv1gbnx09Js8YcVMD96mpTJ3V/MK5YfIv10dbtrDhGug3IS1V2J+0BB9orbQja554N+4S0I9rFBgVCpvPmQqddDHd/AdGkLv/zjEfGytjnvp68bEfDinkQkPfuxw01yd5MbcvLv39VVICWtKbqW263HT5LvSxwKorR7"
# => "e5:c2:43:9e:e4:0c:0c:47:82:7a:3b:e9:61:13:bd:9c:43:eb:4c:b7"
SSHKey.sha256_fingerprint "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC9HuXvYJPtQE/o/7TYi63yAopsrJ6TP+lDGdyQ+nVVp+5ojAIy9h8/h99UlNxjkiFT2YhI3Fl/pgNDRO4PVo6tlgb3CwiAZjSdeE5RnF79Dkj5XsM4j+FLMoXtbRw0K9ok9RKjz6ygIs1JDmaOdXexFnq4nAYU3fSLUa6WoccqTHe8bFuJoAv1gbnx09Js8YcVMD96mpTJ3V/MK5YfIv10dbtrDhGug3IS1V2J+0BB9orbQja554N+4S0I9rFBgVCpvPmQqddDHd/AdGkLv/zjEfGytjnvp68bEfDinkQkPfuxw01yd5MbcvLv39VVICWtKbqW263HT5LvSxwKorR7"
# => "x1GEnx1SRY/QwxjMAoyO6mhQlaBedDHtYLEmfeUXy3o="

Convert to SSH2 Public Key

Convert an existing SSH Public Key into an SSH2 Public key. Returns SSHKey::PublicKeyError if a valid key cannot be generated.

SSHKey.ssh_public_key_to_ssh2_public_key "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC9HuXvYJPtQE/o/7TYi63yAopsrJ6TP+lDGdyQ+nVVp+5ojAIy9h8/h99UlNxjkiFT2YhI3Fl/pgNDRO4PVo6tlgb3CwiAZjSdeE5RnF79Dkj5XsM4j+FLMoXtbRw0K9ok9RKjz6ygIs1JDmaOdXexFnq4nAYU3fSLUa6WoccqTHe8bFuJoAv1gbnx09Js8YcVMD96mpTJ3V/MK5YfIv10dbtrDhGug3IS1V2J+0BB9orbQja554N+4S0I9rFBgVCpvPmQqddDHd/AdGkLv/zjEfGytjnvp68bEfDinkQkPfuxw01yd5MbcvLv39VVICWtKbqW263HT5LvSxwKorR7 [email protected]"
# => "---- BEGIN SSH2 PUBLIC KEY ----\nComment: [email protected]\nAAAAB3NzaC1yc2EAAAADAQABAAABAQC9HuXvYJPtQE/o/7TYi63yAopsrJ6TP+lDGdyQ+n\nVVp+5ojAIy9h8/h99UlNxjkiFT2YhI3Fl/pgNDRO4PVo6tlgb3CwiAZjSdeE5RnF79Dkj5\nXsM4j+FLMoXtbRw0K9ok9RKjz6ygIs1JDmaOdXexFnq4nAYU3fSLUa6WoccqTHe8bFuJoA\nv1gbnx09Js8YcVMD96mpTJ3V/MK5YfIv10dbtrDhGug3IS1V2J+0BB9orbQja554N+4S0I\n9rFBgVCpvPmQqddDHd/AdGkLv/zjEfGytjnvp68bEfDinkQkPfuxw01yd5MbcvLv39VVIC\nWtKbqW263HT5LvSxwKorR7\n---- END SSH2 PUBLIC KEY ----"

SSHKey

SSH private and public key generator in pure Ruby (RSA & DSA)

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SSHKey

Requirements

Installation

Usage

Generate a new key

Use your existing key

The SSHKey object

Private and public keys

Encryption

Comments

Bit length

Fingerprints

Public Key Directives

Randomart

Original OpenSSL key object

Existing SSH public keys

Validation

Bit length

Fingerprints

Convert to SSH2 Public Key

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