[drupal-devel] OpenId-compatible encryption in PHP
steven at acko.net
Sun May 22 14:50:16 UTC 2005
> Some of the technologies used by OpenId (or under consideration):
> DSA encryption (using PEM key formatting)
> RSA encryption (under consideration)
> SHA1 encryption
> DER encoding
> BASE64 encoding
> I'm vaguely familiar with many of these technologies, and have even
> used several of them. SHA1 is natively supported by PHP >= 4.3.0.
> BASE64 is natively supported by PHP
You're mixing many things here.
BASE64 is a way to encode binary data as ascii. It is not an encryption
algorithm in any way.
SHA1 is a hash function. It calculates a fixed-length checksum from a
variable-length input. Other popular hashes include MD5 (what we use for
I don't know DER, but googling shows it is a file format for digital
RSA is a public/private key based encryption system, mostly used for
signatures with a fixed length. Using it for general encryption is not
as practical, but possible.
DSA is also a public/private key based encryption system, but afaik it
can only be used for signatures.
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