1 #!/usr/bin/env python3 2 # 3 #============================================================================ 4 # 5 # NAME 6 # 7 # millerRabin.py 8 # 9 # DESCRIPTION 10 # 11 # Miller-Rabin test for primality. 12 # 13 # USAGE 14 # 15 # To test n for primality using random number a, 16 # 17 # python millerRabin.py n a 1 18 # 19 # EXAMPLES 20 # 21 # python millerRabin.py 104729 47340 1 22 # Testing n = 104729 for primality using random integer x = 47340 23 # Remove powers of 2 24 # k = 1 n1 = 52364 25 # k = 2 n1 = 26182 26 # k = 3 n1 = 13091 27 # q = 3 k = 13091 28 # Generate and test the sequence x^(q^k) mod n. 29 # j = 0 y = 87711 30 # j = 1 y = 36639 31 # j = 2 y = 104728 32 # Probably prime. Found y = n-1 or j = 0 and y = 1 y = 104728 j = 2 33 # 34 # python millerRabin.py 9999612 32423 1 35 # Testing n = 9999612 for primality using random integer x = 32423 36 # Remove powers of 2 37 # q = 0 k = 9999611 38 # Generate and test the sequence x^(q^k) mod n. 39 # Definitely composite. Fell off the end of the loop. 40 # 41 # ./millerRabin.py 8398 1884460498967805432001612672369307101507474835976431925948333387748670120353629453261347843140212808\ 42 # 570505767386771290423087216156597588216186445958479269565424431335013281 122 1 43 # Testing n = 188446049896780543200161267236930710150747483597643192594833338774867012035362945326134784314021280857050576\ 44 # 7386771290423087216156597588216186445958479269565424431335013281 for primality using random integer x = 122 45 # Remove powers of 2 46 # k = 1 n1 = 942230249483902716000806336184653550753737417988215962974166693874335060176814726630673921570106404285252883693\ 47 # 385645211543608078298794108093222979239634782712215667506640 48 # k = 2 n1 = 47111512474195135800040316809232677537686870899410798148708334693716753008840736331533696078505320214262644184\ 49 # 6692822605771804039149397054046611489619817391356107833753320 50 # k = 3 n1 = 235557562370975679000201584046163387688434354497053990743541673468583765044203681657668480392526601071313220923\ 51 # 346411302885902019574698527023305744809908695678053916876660 52 # k = 4 n1 = 1177787811854878395001007920230816938442171772485269953717708367342918825221018408288342401962633005356566104616\ 53 # 73205651442951009787349263511652872404954347839026958438330 54 # k = 5 n1 = 5888939059274391975005039601154084692210858862426349768588541836714594126105092041441712009813165026782830523083\ 55 # 6602825721475504893674631755826436202477173919513479219165 56 # q = 5 k = 5888939059274391975005039601154084692210858862426349768588541836714594126105092041441712009813165026782830523083\ 57 # 6602825721475504893674631755826436202477173919513479219165 58 # Generate and test the sequence x^(q^k) mod n. 59 # j = 0 y = 4562627375418921997495128389472904369506849162624397308228643567229422125069828207111411946939507039364910257582\ 60 # 53679056110147196100972654986996407565104255499753038631160 61 # j = 1 y = 181921118629873824198891977536932720607952192628256115040458970624355555142399332847486840509884746125806162856\ 62 # 2013490792783220259040379029588830209459993575609245826016160 63 # j = 2 y = 1675291436909496660109561278257723410018131370324303168442668644288721609236515790057247572821758832994480351123\ 64 # 772012853725200818096891590375783891432523321208439264772913 65 # j = 3 y = 1884460498967805432001612672369307101507474835976431925948333387748670120353629453261347843140212808570505767386\ 66 # 771290423087216156597588216186445958479269565424431335013280 67 # Probably prime. Found y = n-1 or j = 0 and y = 1 y = 18844604989678054320016126723693071015074748359764319259483333877486\ 68 # 70120353629453261347843140212808570505767386771290423087216156597588216186445958479269565424431335013280 j = 3 69 # 70 # AUTHOR 71 # 72 # Sean E. O'Connor 3 Apr 2015 Version 1.0 released. 73 # 74 # NOTES 75 # 76 # Python interpreter: https://www.python.org/ 77 # Python tutorial and reference: htttp://docs.python.org/lib/lib.html 78 # Python regular expression howto: https://docs.python.org/3.7/howto/regex.html 79 # 80 # LEGAL 81 # 82 # millerRabin.py Version 1.0 - A Python program to do the Miller-Rabin test for primality. 83 # Copyright (C) 2017-2024 by Sean Erik O'Connor. All Rights Reserved. 84 # 85 # This program is free software: you can redistribute it and/or modify 86 # it under the terms of the GNU General Public License as published by 87 # the Free Software Foundation, either version 3 of the License, or 88 # (at your option) any later version. 89 # 90 # This program is distributed in the hope that it will be useful, 91 # but WITHOUT ANY WARRANTY; without even the implied warranty of 92 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 93 # GNU General Public License for more details. 94 # 95 # You should have received a copy of the GNU General Public License 96 # along with this program. If not, see <http://www.gnu.org/licenses/>. 97 # 98 # The author's address is seanerikoconnor!AT!gmail!DOT!com 99 # with !DOT! replaced by . and the !AT! replaced by @ 100 # 101 #============================================================================ 102 103 import sys 104 105 def main(): 106 107 print( "Running Python Version {0:d}.{1:d}.{2:d}".format( sys.version_info[ 0 ], sys.version_info[ 1 ], sys.version_info[ 2 ] ) ) 108 109 if len( sys.argv ) != 4: 110 print( "Usage: python MillerRabin.py n x d" ) 111 print( " n the number to be tested for primality" ) 112 print( " x any random number" ) 113 print( " d nonzero turns on debug prints" ) 114 sys.exit() 115 else: 116 n = int( sys.argv[ 1 ] ) 117 x = int( sys.argv[ 2 ] ) 118 if int( sys.argv[ 3 ] ) == 0: 119 debug = False 120 else: 121 debug = True 122 123 if debug: 124 print( "Testing n = {0:d} for primality using random integer x = {1:d}".format( n, x ) ) 125 126 if MillerRabin( n, x, debug ): 127 print( "Probably prime" ) 128 else: 129 print( "Definitely composite" ) 130 131 sys.exit( 0 ) 132 133 def MillerRabin( n, x, debug ): 134 n1 = n - 1 135 136 # Remove powers of 2. 137 k = 0 138 even = True 139 140 if debug: 141 print( "Remove powers of 2" ) 142 143 while n1 % 2 == 0: 144 n1 //= 2 145 k += 1 146 if debug: 147 print( "k = {0:d} n1 = {1:d}".format( k, n1 )) 148 149 q = n1 150 151 if debug: 152 print( "q = {0:d} k = {1:d}".format( k, n1 ) ) 153 154 y = pow( x, q, n ) 155 156 if debug: 157 if debug: 158 print( "Generate and test the sequence x^(q^k) mod n. " ) ; 159 160 for j in range (0,k): 161 if debug: 162 print( "j = {0:d} y = {1:d}".format( j, y )) 163 164 if (j == 0 and y == 1) or y == n-1: 165 if debug: 166 print( "Probably prime. Found y = n-1 or j = 0 and y = 1 y = {0:d} j = {1:d}".format( y, j ) ) 167 return True 168 169 if j > 0 and y == 1: 170 if debug: 171 print( "Definitely composite. Found j > 0 and y = 1" ) 172 return False 173 174 y = pow( y, 2, n ) 175 176 if debug: 177 print( "Definitely composite. Fell off the end of the loop." ) 178 return False 179 180 # Call the main. 181 if __name__ == '__main__': 182 main()
