DER is short for ASN.1 Distinguished Encoding Rules. The actual format of certificates and things are standardized by X.500 but these documents are expensive, so the Internet RFC people have reprinted the information in a series of documents. Take a look at ftp://www.ietf.org/rfc/rfc3280.txt particularly the examples in Appendix C for the DER formats for certificates.
As for keys, I think the standards document are the PKCS documents which can be found at http://www.rsasecurity.com/rsalabs look on the left for PKCS and get PKCS #1 RSA Cryptography Standard. Look in chapter 11 ASN.1 syntax 11.1 Key representations 11.1.1 Public-key syntax
I think this is right -- good luck!
Andrus wrote:
I need to decrypt RSA signature using RSA public key. Thanks to Nils Larsch reply I discovered that the following command can be used for this:
openssl rsautl -verify -in sig.bin -inkey public.der -pubin -keyform DER -out signout.bin
I have a RSA 1024 bits modulus and exponent 3
I need to create a public.der file (160 bytes) from this data to be passed to openssl using not a C language.
I looked into openssl sources but havent yet found DER file structure description.
Where I can found the DER public file structure description which this command accepts ?
Andrus.
______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List [EMAIL PROTECTED] Automated List Manager [EMAIL PROTECTED]
-- "An Internet-connected Windows machine is tantamount to a toddler carrying a baggie of $100 bills down a city street..."
Charles B (Ben) Cranston mailto: [EMAIL PROTECTED] http://www.wam.umd.edu/~zben
______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List [EMAIL PROTECTED] Automated List Manager [EMAIL PROTECTED]
