diff options
Diffstat (limited to 'rsa/randnum.py')
| -rw-r--r-- | rsa/randnum.py | 20 |
1 files changed, 10 insertions, 10 deletions
diff --git a/rsa/randnum.py b/rsa/randnum.py index 0e78274..2bb5806 100644 --- a/rsa/randnum.py +++ b/rsa/randnum.py @@ -14,7 +14,7 @@ # See the License for the specific language governing permissions and # limitations under the License. -'''Functions for generating random numbers.''' +"""Functions for generating random numbers.""" # Source inspired by code by Yesudeep Mangalapilly <yesudeep@gmail.com> @@ -23,12 +23,13 @@ import os from rsa import common, transform from rsa._compat import byte + def read_random_bits(nbits): - '''Reads 'nbits' random bits. + """Reads 'nbits' random bits. If nbits isn't a whole number of bytes, an extra byte will be appended with only the lower bits set. - ''' + """ nbytes, rbits = divmod(nbits, 8) @@ -45,8 +46,8 @@ def read_random_bits(nbits): def read_random_int(nbits): - '''Reads a random integer of approximately nbits bits. - ''' + """Reads a random integer of approximately nbits bits. + """ randomdata = read_random_bits(nbits) value = transform.bytes2int(randomdata) @@ -57,13 +58,14 @@ def read_random_int(nbits): return value + def randint(maxvalue): - '''Returns a random integer x with 1 <= x <= maxvalue - + """Returns a random integer x with 1 <= x <= maxvalue + May take a very long time in specific situations. If maxvalue needs N bits to store, the closer maxvalue is to (2 ** N) - 1, the faster this function is. - ''' + """ bit_size = common.bit_size(maxvalue) @@ -81,5 +83,3 @@ def randint(maxvalue): tries += 1 return value - - |