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I'm looking for a simple to use cross-platform bcrypt library for C. I've searched around a couple places but nothing seems to compares to the ease of use of:
http://bcrypt.codeplex.com/SourceControl/changeset/view/1eef0262901c#BCrypt.Net.Test%2fTestBCrypt.cs
Why are all the C implementations of this a nightmare compared to this .NET lib? Basically 2 functions is what I'm looking for.
1) Generate salt (return a string)
2) Hash string using a given salt & pw (return a string)
Your C options for bcrypt seem to be:
In OpenBSD: https://github.com/openbsd/src/blob/master/lib/libc/crypt/bcrypt.c
In OpenWall: http://openwall.com/crypt/
The C implementations seem to be pretty straightforward to use. The OpenBSD version looks like this:
char *bcrypt(const char *key, const char *salt);
char *bcrypt_gensalt(u_int8_t log_rounds);
P.S. Consider scrypt for new code, if you are not restricted to using bcrypt only due to backward compatibility,
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so i had a homework to get a document (a buffer of ASCII bytes) which has the CRC32 hash (the gzip variant of CRC32), of 0xbbd1264f and unti now i don't know how to get it so if someone know how to do that please answer
spoof will calculate what bits out of a provided candidate set to invert in order to force the CRC to the desired value.
From your question, I think you mean generating collision for crc32 with your document.
You can find a lot of articles about creating crc32 collisions. For example you can see it here, here or here.
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I am looking for a high performance data structure on GPU (preferably over CUDA). The CUDPP is something cool but it does not satisfy my requirements because I want my key to be fixed size int array. I need to query 10k+ queries per second over a KEY-VALUE store of size 1M+. Is there any library already providing such type of functionality. I tried alternates on CPU but they are not that good for the purpose.
I haven't used it, though I have heard about a hashmap extension for CUDA Thrust. Present here:
Cuda-thrust-extensions library
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I want to handle extremely large integer values of a few million digits for an experiment I'm conducting.
Which language is best for this? I know some languages such as batch have pre-established limits on how many digits it can handle.
I have a large RAM and 64-bit OS, so my machine isn't a problem.
Regards,
-Master-chip
in python 3.x the int type does not have a limit so if you are just looking for a suggestion I would check out python.
see https://docs.python.org/3.1/whatsnew/3.0.html#integers
What are you looking to do with the numbers? If your number is larger than the maximum value of an unsigned 64 bit long is 18446744073709551615 then you won't be able to use the normal types and will want to look at languages that support bigInts http://docs.oracle.com/javase/6/docs/api/java/math/BigInteger.html
Honestly there are solutions for this in most languages you will just have to pick the one you want to work with and look at its solution
Can you store these values as Strings?
Do you need complete accuracy of the numbers or can you store them as floats
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I have input sentences such as "I went to cup the ball." (cup is a verb) and "I drank milk from cup." (cup is a noun) and I need to figure out whether each word is a noun, adjective, verb, etc for my application. I am no linguist and I would rather not spend days/weeks writing some effective sentence parser. Does there exist a free script or API that can accomplish this task? The faster the algorithm the better because I plan to parse entire essays at a time.
I am writing this application in C#, so if possible that language is prefered.
Try Stanford CoreNLP for .NET or SharpNLP. I've never actually used these, so I can't comment further. I've played with NLTK in Python before.
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What I mean is differentiation and integration, stuff that a CAS would do? (like a Typical handheld CAS if not better.)
Is this possible? What gem(s) would I need to install? Does anyone have any experience with this?
Here are a few gems - in different states of development and completeness - that help increase the "mathing" power of Ruby:
numo-linalg Linear Algebra Library for Ruby/Numo::NArray
nmatrix Dense and sparse linear algebra library for Ruby via SciRuby
rb-gsl Ruby interface to the GNU Scientific Library
daru Data Analysis in Ruby
mathn Deprecated library that extends math operations
mathematical Convert mathematical equations to SVGs, PNGs, or MathML
Unfortunately, Ruby as a language has mostly been used for rapid web application prototyping and development and NOT scientific analysis or data science. Thus, it's capabilities in this area - when compared to other languages such as a Python - are still somewhat lacking.