Couple of questions re: attributes

OK, I'm new at cryptlib, so bear with me.

First:  When setting a salt on a context, what is expected in the 
string?  I.e., in the Python bindings if I do:

cryptSetAttributeString(context, CRYPT_CTXINFO_KEYING_SALT, salt)

When salt is a packed string (i.e., bytestring) or an arbitrary string, 
I get a bad argument error.  *Some* uppercase hex strings are accepted, 
some aren't (e.g., '7D60435F02E9E0AE' works, '1234567890ABCDEF' 
doesn't).  What's the criteria and is this documented somewhere?  I 
can't find a mention in the docs.

Second:  When setting a password on a context I'm getting an internal 
consistency check raised.  Clearly I'm in the wrong here, but it looks 
right to me.  E.g. (again in Python):

 >>> from cryptlib_py import *
 >>> salt = '7D60435F02E9E0AE'
 >>> ctx = cryptCreateContext(CRYPT_UNUSED, CRYPT_ALGO_DES)
 >>> cryptSetAttribute(ctx, CRYPT_CTXINFO_KEYSIZE, 8)
 >>> cryptSetAttribute(ctx, CRYPY_KEYING_ITERATIONS, 800)
 >>> cryptSetAttributeString(ctx, CRYPT_CTXINFO_KEYING_SALT, salt)
 >>> cryptSetAttributeString(ctx, CRYPT_CTXINFO_KEYING_VALUE, 'password')
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
cryptlib_py.CryptException: (-16, 'Internal consistency check failed')

Interestingly, other values of the password value can yield a bad 
argument error.  E.g.:

 >>> cryptSetAttributeString(ctx, CRYPT_CTXINFO_KEYING_VALUE, 'Cv(G%$Va')
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
cryptlib_py.CryptException: (-3, 'Bad argument, parameter 3')

Any help is always appreciated.  (FWIW all I'm doing is trying to 
validate some test vectors as a way to familiarize myself with cryptlib. 
  Real work comes later. ;)

-- Tim

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