mς KγΈEc@s;dZd„ZdZdfd„ƒYZddd„ZdS(sxHMAC (Keyed-Hashing for Message Authentication) Python module. Implements the HMAC algorithm as described by RFC 2104. cCsditd„||ƒƒS(sKUtility method. XOR the two strings s1 and s2 (must have same length). tcCstt|ƒt|ƒAƒS(N(tchrtordtxty(RR((t,/data/zmath/zope/lib/python/ZEO/auth/hmac.pyt sN(tjointmapts1ts2(R R ((Rt_strxorstHMACcBsAtZdZeed„Zd„Zd„Zd„Zd„ZRS(s_RFC2104 HMAC class. This supports the API for Cryptographic Hash Functions (PEP 247). cCs |djodk}|}n||_|iƒ|_|iƒ|_|i|_d}d|}d|}t |ƒ|jo|i|ƒi ƒ}n|tdƒ|t |ƒ}|iit||ƒƒ|iit||ƒƒ|dj o|i|ƒndS(sέCreate a new HMAC object. key: key for the keyed hash object. msg: Initial input for the hash, if provided. digestmod: A module supporting PEP 247. Defaults to the md5 module. Ni@t6s\i(t digestmodtNonetmd5tselftnewtoutertinnert digest_sizet blocksizetipadtopadtlentkeytdigestRtupdateR tmsg(RRRRRRRR((Rt__init__s$        cCs|ii|ƒdS(s8Update this hashing object with the string msg. N(RRRR(RR((RR5scCs@tdƒ}|i|_|iiƒ|_|iiƒ|_|S(syReturn a separate copy of this hashing object. An update to this copy won't affect the original object. RN(R totherRRRtcopyR(RR((RR :s   cCs/|iiƒ}|i|iiƒƒ|iƒS(sφReturn the hash value of this hashing object. This returns a string containing 8-bit data. The object is not altered in any way by this function; you can continue updating the object after calling this function. N(RRR thRRR(RR!((RREscCsMdig}t|iƒƒD]&}|tt|ƒƒdidƒq~ƒS(sKLike digest(), but returns a string of hexadecimal digits instead. RiN( Rt_[1]ttupleRRRthexRtzfill(RR"R((Rt hexdigestPs( t__name__t __module__t__doc__RRRR RR&(((RR s   cCst|||ƒS(sVCreate a new hashing object and return it. key: The starting key for the hash. msg: if available, will immediately be hashed into the object's starting state. You can now feed arbitrary strings into the object using its update() method, and can ask for the hash value at any time by calling its digest() method. N(R RRR(RRR((RRVs N(R)R RRR R(R RR R((Rt?s G