code review 6208076: crypto/rsa: add SHA-224 hash prefix

crypto/rsa: add SHA-224 hash prefix

http://www.rsa.com/rsalabs/node.asp?id=2125:

NOTE: A new OID has been defined for the combination
of the v1.5 signature scheme and the SHA-224 hash function:
        sha224WithRSAEncryption OBJECT IDENTIFIER ::=
Like the other sha*WithRSAEncryption OIDs in PKCS #1 v2.1,
this OID has NULL parameters.
The DigestInfo encoding for SHA-224 (see Section 9.2, Note 1) is:
        (0x)30 2d 30 0d 06 09 60 86 48 01 65 03 04 02 04 05 00 04 1c || H

[rsc, 2012-05-17 23:48:56]

Hello golang-dev@googlegroups.com,

I'd like you to review this change to
https://go.googlecode.com/hg/

[rsc, 2012-05-17 23:50:13]

R=agl

This is untested, although I have some private code that I plan to
check it against.  I believe OpenSSL supports this, which is why I
went looking for it, but as far as I can tell the only documentation
of this number is on that one RSA web page.  Very strange.

[agl1, 2012-05-18 01:11:37]

LGTM

[rsc, 2012-05-21 18:10:19]

Confirmed against OpenSSL.  Submitting.

[rsc, 2012-05-21 18:10:21]

*** Submitted as http://code.google.com/p/go/source/detail?r=c6213d8a9118 ***

crypto/rsa: add SHA-224 hash prefix

http://www.rsa.com/rsalabs/node.asp?id=2125:

NOTE: A new OID has been defined for the combination
of the v1.5 signature scheme and the SHA-224 hash function:
        sha224WithRSAEncryption OBJECT IDENTIFIER ::=
Like the other sha*WithRSAEncryption OIDs in PKCS #1 v2.1,
this OID has NULL parameters.
The DigestInfo encoding for SHA-224 (see Section 9.2, Note 1) is:
        (0x)30 2d 30 0d 06 09 60 86 48 01 65 03 04 02 04 05 00 04 1c || H

R=golang-dev, agl
CC=golang-dev
http://codereview.appspot.com/6208076