And here's the rub: OpenSSL (what eventually backs all of this) doesn't actually support those curves yet. For Ed25519 it's just the 40 bytes of the raw key. Note that these functions are only available when building against version 1.1.1 or newer of the openssl library. If someone acquires your private key, they can log in as you to any SSH server you have access to. Ah! The private key files are the equivalent of a password, and should protected under all circumstances. 9830e7e. I was able to sign and verify a payload using EVP_DigestSign using my openssh keys. The public keys always consist of 32 bytes of data; the private key is 64 bytes for ed25519 and 32 bytes for curve25519. The text was updated successfully, but these errors were encountered: I'm trying to read ed25519 and curve25519 keys generated with ssh-keygen and sodium in openssl as EVP keys. You can use EVP_PKEY_get_raw_private_key or EVP_PKEY_get_raw_public_key as appropriate to get hold of the raw key data (documented on the same man page as above). So, if the above is correct, then to convert a raw OpenSSL private key to a libsodium private key, generate the SHA-512 hash and then perform the same bitwise operations as in the above code snippet. I'm trying to read ed25519 and curve25519 keys generated with ssh-keygen and sodium in openssl as EVP keys. Such public keys always consist of 32 bytes of raw data and the private key is 64 bytes for ed25519 and 32 bytes for x25519. Instead you should use the EVP_Digest* functions to do the SHA512 step). There are detailed examples of the format for Ed25519 here: https://tools.ietf.org/html/rfc8410#section-10. If I generate an ed25519 keypair using ssh-keygen -t ed25519 I get a file of the format "OPENSSH PRIVATE KEY". You can create an EVP_PKEY from raw ed25519 key data using EVP_PKEY_new_raw_private_key or EVP_PKEY_new_raw_public_key. 2. The simplest way to generate a key pair is to run … openssl rsa -pubout -in private_key.pem -out public_key.pem Extracting … To generate an Ed25519 private key: $ openssl genpkey -algorithm ed25519 -outform PEM -out test25519.pem OpenSSL does not support outputting only the raw key from the command line. You can create an EVP_PKEY from raw ed25519 key data using EVP_PKEY_new_raw_private_key or EVP_PKEY_new_raw_public_key. Issue #6357 that you linked to, has a link to this blog post: https://blog.mozilla.org/warner/2011/11/29/ed25519-keys/. However unfortunately I am unable to test if I can actually sign/verify with this keypair because EVP_PKEY_sign_init gives an error: operation not supported for this keytype. As mentioned on the Ed25519 man page you should call EVP_DigestSignInit() with the "digest" parameter set to NULL, and then call the one-shot EVP_DigestSign() function. Example of how to create EVP keys from ed25519 data. The public key is what is placed on the SSH server, and may be shared … It's quite an old article so whether this is the same as the format used today in libsodium is unclear - but it seems likely. Is this another format? Using PHP-7.3.13 and OpenSSL-1.1.1d. EVP_PKEY_sign* is intended for signing pre-hashed data. For RSA it's the ASN1 sequence of the key. Generating Private Keys. This module can generate RSA, DSA, ECC or EdDSA private keys in PEM format. Unfortunately that means you won't be able to go in the other direction, i.e. 1. However the DER serialized private key is 48 bytes (instead of 64) and the public key is 44 bytes. Generates an ED25519 key and saves to PuTTY format. Or possibly it isn't a private key at all and is an Ed25519 signature (which is 64 bytes in length). Not sure, but isn't it possible? See the man page here: https://www.openssl.org/docs/man1.1.1/man3/EVP_PKEY_new_raw_private_key.html, The other way around is also unclear to me. (As an aside if you re-implement the expansion shown in the above code snippet, I recommend against calling the SHA512 routines directly as is done internally. Possibly it is a raw private key and public key concatenated together. While Encrypting a File with a Password from the Command Line using OpenSSL is very useful in its own right, the real power of the OpenSSL library is its ability to support the use of public key cryptograph for encrypting or validating data in an unattended manner (where the password is not required to encrypt) is done with public keys.. You *can* get it in SubjectPublicKeyInfo format which, for an Ed25519 key will always consist of 12 bytes of ASN.1 header followed by 32 bytes of https://libsodium.gitbook.io/doc/public-key_cryptography/public-key_signatures#key-pair-generation. By default OpenSSL will work with PEM files for storing EC private keys. Would it be possible to add a simple example to the docs how to create an EVP_PKEY or EVP_KEY from raw ed25519/x25519 data? ssh-copy-id -i ~/.ssh/id_ed25519.pub michael@192.168.1.251. You signed in with another tab or window. a private key is 256 bits (== 32 bytes). On 26/03/18 13:55, Salz, Rich via openssl-users wrote: https://mta.openssl.org/mailman/listinfo/openssl-users, https://tools.ietf.org/html/draft-ietf-dcrup-dkim-crypto-08#section-4.2. these steps that are done internally in OpenSSL: Lines 5435 to 5447 Is this another format? However the DER serialized private key is 48 bytes (instead of 64) and the public key is 44 bytes. ECC. On 25/03/18 02:05, Viktor Dukhovni wrote: On 24/03/18 23:44, Salz, Rich via openssl-users wrote: On 26/03/18 06:13, Viktor Dukhovni wrote: >    I might, but people using envelope-from <. I had just discovered (by pure guessing) that I can read the private key from the initial 32 bytes of the 64 byte blob in the ssh private key. the raw OpenSSL 32-bit private key) after being run through SHA-512 and then various bits are set/cleared, i.e. I made some progress and was able to parse and import/export the openssh 32 byte public keys using EVP_PKEY_get_raw_public_key and EVP_PKEY_new_raw_public_key. Then we should create a configuration file for OpenSSL, where we can list all the SANs we want to include in the certificate as well as setting proper key usage bits: The other way around is also unclear to me. Docs how to create EVP keys generate or renew an Existing Certificate and private generate ed25519 key openssl files are equivalent... 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