Forum: Ruby-core [ext/openssl] Fix RSA public key encoding

Issue #4421 has been updated by uggsoutlet (uggsoutlet uggsoutlet).


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Bug #4421: [ext/openssl] Fix RSA public key encoding
https://bugs.ruby-lang.org/issues/4421#change-33475

Author: MartinBosslet (Martin Bosslet)
Status: Closed
Priority: Normal
Assignee: MartinBosslet (Martin Bosslet)
Category: ext
Target version: 1.9.3
ruby -v: -


=begin
 When calling RSA#to_der and RSA#to_pem on RSA public keys, they 
currently
 get encoded using i2d_RSAPublicKey and PEM_write_bio_RSAPublicKey. This 
encoding
 was specified in PKCS#1 and is specific to RSA. It is also not the 
default
 encoding used by OpenSSL itself, which rather uses the generic format 
generated
 by i2d_RSA_PUBKEY and PEM_write_bio_RSA_PUBKEY. This format is the same 
that is
 used in a certificate's SubjectPublicKeyInfo, the advantage being that 
the format
 is generic and can be used to represent public keys of all kinds, 
including RSA,
 DSA and Elliptic Curve.

 The attached patch will make use of the generic format for encoding RSA 
keys. The
 change should not cause compatibility problems, since RSA#initialize 
uses several
 fallback scenarios that cover public keys of both formats.

 The fallbacks are also re-prioritized according to these changes.

 Regards,
 Martin
=end