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How to enter a multiprecision integer in hex big endian

asked 2012-01-29 06:50:05 -0500

anonymous user

Anonymous

Hi,

I have a multiprecision integer (retrieved from a gpg signature). Example:

DSA p(2048 bits) - ab 21 99 ...many bytes here ... 5b

How can I enter the hex representation into Sage to work with it?

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answered 2012-01-29 08:21:59 -0500

tbender gravatar image

Found the answer in IRC (thanks, saraedum, few_)

p = ZZ('0x2199 ... 5b')

If the number is pretty big you could also read it from a file:

f = open('/tmp/p.txt')
p = ZZ('0x' + f.read())
f.close()

This assumes that you have a file p.txt containing the hex string with the whitespaces stripped.

hope that helps

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Asked: 2012-01-29 06:50:05 -0500

Seen: 276 times

Last updated: Jan 29 '12