Bonjour,
Le 17/08/2012 09:33, kiran Palli a écrit :
Hi,
I generated an rsa 2048 key-pair with these commands:
openssl.exe genrsa -F4 -out key.pem 2048
openssl.exe rsa -text -in key.pem > key.txt
Now I lost the key.pem file and also lost the key.txt in its original
format.
That's sad. 2 files lost at the same time? And you weren't taught to
take care of these? They weren't important, were they? Why don't you
just throw that key away and pick a new one?
But I have private exponent and public exponent from the text file.
Those were enough for my tool suite to sign a binary file and then
verify. Now I need to test something with openSSL signing, but how do
I recover the private key in .pem format (key.pem)?
Looks like homework. Did you ask Google?
This is the left over portion of key.txt(example, but a valid key-pair):
Private-Key: (2048 bit)
modulus:
|00:f3:5a:8f:46:08:11:d8:f7:65:eb:26:8f:e6:fe:
[...]
d2:61
|
publicExponent: 65537 (0x10001)
privateExponent:
|73:e4:bd:f4:e1:24:f6:ca:23:7c:90:99:d9:ad:9c:
[...]
11|
Using bc you can quickly get p, q, dp and dq. qinv is harder to get, but
it's possible.
--
Erwann ABALEA
