single SK for crypto_sign() and crypto_box_*()

[niXman]

Hi,

in my app I need the possibility to sign the one type of messages using crypto_sign() and to crypt the another type of messages using crypto_box_*().

my question is, since crypto_sign_keypair() and crypto_box_keypair() both generate a private keys, can I use the same private key for both crypto_sign()/crypto_box_*() ?

how can I solve this task?

thanks!

[jedisct1]

See

• Do I need to add a signature to encrypted messages to detect if they have been tampered with? and the next paragraph:
• How can I sign and encrypt using the same key pair?

[niXman]

thank you, but I think we did not understand each other. I will try to explain.

there is a server that can respond to users with two types of responses: 1) signed (crypto_sign()) only. 2) encrypted (crypto_box_*()).

my question is, can I use the same PK/SK pair for both crypto_sign() and crypto_box_*() ?

thanks.

[niXman]

• How can I sign and encrypt using the same key pair?

paraphrasing on my way it would sound like this: How can I sign **OR** encrypt using the same key pair?

[jedisct1]

The title of the section has been changed from sign and encrypt to sign and/or encrypt. Thanks!

[niXman]

=)

[jedisct1]

Reverted, it was actually more confusing :)

[niXman]

ok %)