>From: [email protected] On Behalf Of Nazeer S
>Sent: Sunday, 13 January, 2013 20:24
This is not a -dev question.
>I am working with OpenSSL ECDH function to generate the required
>Key Material. When I am sending the Private data of 32 bytes with
>32nd byte as 0x00, Key Material generated is unable to decrypt the
>Data. If the 32nd byte of the Private key is not 0x00, key material
>generated was able to decrypt the required data. I am using P-256
>elliptical curve for my application. Do you have any possible solution
>for this issue? or if you any suggestion in this regard, please do let me
know.
The solution depends on what you're doing wrong.
First of all, you should never be "sending" an ECDH (or other)
private key anywhere; it should be restricted only to its owner.
For ECDH key agreement, each party should generate (or have) a
keypair, and send the public key to the other party (or provide it
some other way such as publication in a directory). There are
several possible representations of a public key, but the one
used by OpenSSL by default is one octet 04 plus the x coordinate
of the point which for P-256 is 32 octets. The x coordinate (and
also y in other representation) is practically random bits which
can easily include an octet of 00, or other sometimes-special
octets like 0D, 0A, 1A, etc. You must send it (and store it,
if static) by means that preserve all binary values; in some
situations this means encoding, escaping, etc.
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