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go - Generate all possible n-character passwords

As part of a learning-Go exercise, I'm writing a simplistic brute-force password cracker.

To generate all possible 2-character passwords that use the characters A-E in Python, I would use itertools.product():

from itertools import product
for permutation in product('ABCDE', repeat=2):
  print permutation

However, I'm struggling to do this in Go.

Other questions seem to be about permutations, which isn't quite what I want. And while the Python docs include a sample implementation of the function, I don't know how to translate yield into Go.

I suppose I should mention two restrictions:

  1. I'd like the length of the password to be variable. That is, I may want to do 8-character passwords, or 6-character, or something else. This means we can't just nest n loops.
  2. I don't want to have all of them in memory at once.
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