Ssh how many bits

He said 'openssl', not 'openssh'. This would actually work on a private key generated by openssl genrsa. You would probably have to point it directly to the private key file though.

Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown.

The Overflow Blog. Does ES6 make JavaScript frameworks obsolete? Podcast Do polyglots have an edge when it comes to mastering programming Featured on Meta. Now live: A fully responsive profile. Linked 1. Related Hot Network Questions. Connect and share knowledge within a single location that is structured and easy to search. I already created an ssh key for myself sometime in the past. I don't remember "how many bits" it is.

How can I tell? We prefer that you use a key at least bits in length, and if you are generating a new key, the recommended length is bits. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. How can I tell how many bits my ssh key is?

Ask Question. Asked 11 years, 6 months ago. Active 7 months ago. Viewed 81k times. I'm wondering because I'm using hosting at nearlyfreespeech. Evan Carroll. Evan Carroll Evan Carroll 1. Add a comment. Active Oldest Votes. The line above will print out this: 00 00 00 07 73 73 68 2d 72 73 61 00 00 00 03 B This reads as such: 00 00 00 07 The length in bytes of the next field 73 73 68 2d 72 73 61 The key type ASCII encoding of "ssh-rsa" 00 00 00 03 The length in bytes of the public exponent 01 00 01 The public exponent usually , as here 00 00 01 01 The length in bytes of the modulus here, 00 c3 a The modulus So the key has type RSA, and its modulus has length bytes , except that the first byte has value "00", so the real length is bytes that first byte was added so that the value is considered positive, because the internal encoding rules call for signed integers, the first bit defining the sign.

Improve this answer. Tom Leek Tom Leek k 26 26 gold badges silver badges bronze badges. Wow, that's complex. But, well done. I'd have thought there was a way to read in the key and output all of that stuff. At the crypto level, a RSA public key is a couple of big integers; how to encode a public key into bytes is out of scope of RSA "stricto sensu" and is up to the protocol which uses it.

SSH, X. OpenSSL follows the "X. This answer on Stackoverflow digs into the gory format and binary details. If you really wanted to waste 10 minutes you can use openssl asn1parse -genconf an adapt one of these examples to build a DER format which you can parse with OpenSSL Show 7 more comments.