> From: owner-openssl-us...@openssl.org On Behalf Of Mark Bishop > Sent: Tuesday, 06 July, 2010 12:09
> When I execute: > > //Convert public key from PEM to DER > openssl rsa -inform PEM -in public_key.pem -out public_key.der > -outform DER -pubin -pubout > > I get a 162 byte file. > > When I execute: > > //Create public key in DER format > openssl rsa -in private_key.pem -pubout -outform DER -out > public_key.der > > I get a 160 byte file. > > Any ideas why? They aren't the same keypair; if you think they are, you've got your files mixed up. If you are using conventional power-of-two modulus sizes, the likely case is that a PubKeyInfo containing RSA 1k with e=3 encodes to 160 bytes while e=x10001=F4 gives 162. (Other e are possible but not generated by commandline. 'Odd' modulus sizes are possible but rarely chosen.) To see, display with: openssl rsa -in file -inform DER -text -noout or: openssl asn1parse -in file -inform DER ; get the offset from the last item (BITSTRING, should be 18 for these sizes) and: openssl asn1parse -in file -inform DER -strparse offset ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List openssl-users@openssl.org Automated List Manager majord...@openssl.org
