Hello,
> Can anybody help me out please ?
> I get an error saying "unable to load Public Key" when I use my own
> keys.
> Is it that there is a problem with the key ?? with the format ?? with
> the header ?? anything else ??
....
>
> I am a newbie here and I therefore may sound very stupid
> too :)
>
> I am trying to use openssl for encryption using RSA algorithm.
> I want to know whether I can use my own keys for doing this.
> If yes, then how ?
>
> I created a file public.pem and stored my public key in this
> in PEM format.
> Now when I do "openssl rsautl -encrypt -inkey public.pem
> -pubin -in inputfile -out outputfile", I get the error saying
> "unable to load Public Key" which means PEM_read_bio_PUBKEY()
> returns NULL.
Yes, you can but you should have your public key in proper format.
For example:
1) Generate RSA key:
$ openssl genrsa -out key.pem 1024
$ openssl rsa -in key.pem -text -noout
2) Save public key in pub.pem file:
$ openssl rsa -in key.pem -pubout -out pub.pem
$ openssl rsa -in pub.pem -pubin -text -noout
3) Encrypt some data:
$ echo test test test > file.txt
$ openssl rsautl -encrypt -inkey pub.pem -pubin -in file.txt \
-out file.bin
$ ll file.bin
-rw-r--r-- 1 root root 128 2007-07-11 01:58 file.bin
4) Decrypt encrypted data:
$ openssl rsautl -decrypt -inkey key.pem -in file.bin
test test test
But you should have public key in so called SubjectPublicKeyInfo format
(look at RFC2459).
You can look at ASN.1 structure of public key with command:
$ openssl asn1parse -in pub.pem
0:d=0 hl=3 l= 159 cons: SEQUENCE
3:d=1 hl=2 l= 13 cons: SEQUENCE
5:d=2 hl=2 l= 9 prim: OBJECT :rsaEncryption
16:d=2 hl=2 l= 0 prim: NULL
18:d=1 hl=3 l= 141 prim: BIT STRING
Best regards,
--
Marek Marcola <[EMAIL PROTECTED]>
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