javascript address validation? 0.2 BTC bounty (bounty paid)

[bytemaster]

I am looking for something off the shelf that takes an address and validates it via javascript.

Something like this...

validate_btc( address )
{
    return { version:0, hash:'...' } or false;
}


I figure it is out there somewhere and google is failing me, so only a small tip, 0.1 BTC, for an answer.

[Alex Beckenham]

I figure it is out there somewhere and google is failing me, so only a small tip, 0.1 BTC, for an answer.

I will double that, purely out of curiosity... 0.1 from me too.

[unfinishe]

Well, going off of this thread, http://forum.bitcoin.org/index.php?topic=1026.0 , I was able to make a Javascript version of the code here:

http://dl.dropbox.com/u/28441300/check.html (Code and example)

http://dl.dropbox.com/u/28441300/sha256.js
http://dl.dropbox.com/u/28441300/BigInt.js

[Alex Beckenham]

Well, going off of this thread, http://forum.bitcoin.org/index.php?topic=1026.0 , I was able to make a Javascript version of the code here:

http://dl.dropbox.com/u/28441300/check.html (Code and example)

http://dl.dropbox.com/u/28441300/sha256.js
http://dl.dropbox.com/u/28441300/BigInt.js

Good stuff! Just sent 0.1 to your 'college Ramen' fund

[bytemaster]

Thanks, 0.1BTC sent to 17TMiP6xtT4PJu6tQoKb5L8xEL1AA7dafS

[unfinishe]

Thank you!

[DBordello]

I appear to have found a false negative. 

This address does not pass, however is a valid bitcoin address:

1RRi5kDMck5cj2ob4UcjKxnGL2sjknRtv

Thoughts on what it doesn't like?

[Joric]

Tried to debug unfinishe's version, found a strange 4-bit shift which I was unable to fix:

1RRi5kDMck5cj2ob4UcjKxnGL2sjknRtv <- base58 address than gives false negative

00 04 9e 9b c9 36 6d fc 95 15 5e 53 00 84 a7 2a bf 6d 59 1f 07 <- b58decode
00 49 e9 bc 93 66 df c9 51 55 e5 30 08 4a 72 ab f6 d5 91 f0 72 <- javascript

It's either bignum or base58 implementation.

This one works fine http://pastebin.com/B5r3P5Ny (I used modified bitaddress.org code).