Sebastian Kuschel reports that pfd_closing can be called for a socket

[u/mdw/putty] / sshprime.c

diff --git a/sshprime.c b/sshprime.c
index 61488a0..03b9c72 100644 (file)
--- a/sshprime.c
+++ b/sshprime.c
@@ -2,6 +2,7 @@
  * Prime generation.
  */
 
+#include <assert.h>
 #include "ssh.h"
 
 /*
@@ -122,600 +123,825 @@
  * for i in list[1:]: sys.stdout.write("%d," % i)
  */
 static const unsigned short primes[] = {
-    3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97,101,
-    103,107,109,113,127,131,137,139,149,151,157,163,167,173,179,181,191,193,
-    197,199,211,223,227,229,233,239,241,251,257,263,269,271,277,281,283,293,
-    307,311,313,317,331,337,347,349,353,359,367,373,379,383,389,397,401,409,
-    419,421,431,433,439,443,449,457,461,463,467,479,487,491,499,503,509,521,
-    523,541,547,557,563,569,571,577,587,593,599,601,607,613,617,619,631,641,
-    643,647,653,659,661,673,677,683,691,701,709,719,727,733,739,743,751,757,
-    761,769,773,787,797,809,811,821,823,827,829,839,853,857,859,863,877,881,
-    883,887,907,911,919,929,937,941,947,953,967,971,977,983,991,997,1009,
-    1013,1019,1021,1031,1033,1039,1049,1051,1061,1063,1069,1087,1091,1093,
-    1097,1103,1109,1117,1123,1129,1151,1153,1163,1171,1181,1187,1193,1201,
-    1213,1217,1223,1229,1231,1237,1249,1259,1277,1279,1283,1289,1291,1297,
-    1301,1303,1307,1319,1321,1327,1361,1367,1373,1381,1399,1409,1423,1427,
-    1429,1433,1439,1447,1451,1453,1459,1471,1481,1483,1487,1489,1493,1499,
-    1511,1523,1531,1543,1549,1553,1559,1567,1571,1579,1583,1597,1601,1607,
-    1609,1613,1619,1621,1627,1637,1657,1663,1667,1669,1693,1697,1699,1709,
-    1721,1723,1733,1741,1747,1753,1759,1777,1783,1787,1789,1801,1811,1823,
-    1831,1847,1861,1867,1871,1873,1877,1879,1889,1901,1907,1913,1931,1933,
-    1949,1951,1973,1979,1987,1993,1997,1999,2003,2011,2017,2027,2029,2039,
-    2053,2063,2069,2081,2083,2087,2089,2099,2111,2113,2129,2131,2137,2141,
-    2143,2153,2161,2179,2203,2207,2213,2221,2237,2239,2243,2251,2267,2269,
-    2273,2281,2287,2293,2297,2309,2311,2333,2339,2341,2347,2351,2357,2371,
-    2377,2381,2383,2389,2393,2399,2411,2417,2423,2437,2441,2447,2459,2467,
-    2473,2477,2503,2521,2531,2539,2543,2549,2551,2557,2579,2591,2593,2609,
-    2617,2621,2633,2647,2657,2659,2663,2671,2677,2683,2687,2689,2693,2699,
-    2707,2711,2713,2719,2729,2731,2741,2749,2753,2767,2777,2789,2791,2797,
-    2801,2803,2819,2833,2837,2843,2851,2857,2861,2879,2887,2897,2903,2909,
-    2917,2927,2939,2953,2957,2963,2969,2971,2999,3001,3011,3019,3023,3037,
-    3041,3049,3061,3067,3079,3083,3089,3109,3119,3121,3137,3163,3167,3169,
-    3181,3187,3191,3203,3209,3217,3221,3229,3251,3253,3257,3259,3271,3299,
-    3301,3307,3313,3319,3323,3329,3331,3343,3347,3359,3361,3371,3373,3389,
-    3391,3407,3413,3433,3449,3457,3461,3463,3467,3469,3491,3499,3511,3517,
-    3527,3529,3533,3539,3541,3547,3557,3559,3571,3581,3583,3593,3607,3613,
-    3617,3623,3631,3637,3643,3659,3671,3673,3677,3691,3697,3701,3709,3719,
-    3727,3733,3739,3761,3767,3769,3779,3793,3797,3803,3821,3823,3833,3847,
-    3851,3853,3863,3877,3881,3889,3907,3911,3917,3919,3923,3929,3931,3943,
-    3947,3967,3989,4001,4003,4007,4013,4019,4021,4027,4049,4051,4057,4073,
-    4079,4091,4093,4099,4111,4127,4129,4133,4139,4153,4157,4159,4177,4201,
-    4211,4217,4219,4229,4231,4241,4243,4253,4259,4261,4271,4273,4283,4289,
-    4297,4327,4337,4339,4349,4357,4363,4373,4391,4397,4409,4421,4423,4441,
-    4447,4451,4457,4463,4481,4483,4493,4507,4513,4517,4519,4523,4547,4549,
-    4561,4567,4583,4591,4597,4603,4621,4637,4639,4643,4649,4651,4657,4663,
-    4673,4679,4691,4703,4721,4723,4729,4733,4751,4759,4783,4787,4789,4793,
-    4799,4801,4813,4817,4831,4861,4871,4877,4889,4903,4909,4919,4931,4933,
-    4937,4943,4951,4957,4967,4969,4973,4987,4993,4999,5003,5009,5011,5021,
-    5023,5039,5051,5059,5077,5081,5087,5099,5101,5107,5113,5119,5147,5153,
-    5167,5171,5179,5189,5197,5209,5227,5231,5233,5237,5261,5273,5279,5281,
-    5297,5303,5309,5323,5333,5347,5351,5381,5387,5393,5399,5407,5413,5417,
-    5419,5431,5437,5441,5443,5449,5471,5477,5479,5483,5501,5503,5507,5519,
-    5521,5527,5531,5557,5563,5569,5573,5581,5591,5623,5639,5641,5647,5651,
-    5653,5657,5659,5669,5683,5689,5693,5701,5711,5717,5737,5741,5743,5749,
-    5779,5783,5791,5801,5807,5813,5821,5827,5839,5843,5849,5851,5857,5861,
-    5867,5869,5879,5881,5897,5903,5923,5927,5939,5953,5981,5987,6007,6011,
-    6029,6037,6043,6047,6053,6067,6073,6079,6089,6091,6101,6113,6121,6131,
-    6133,6143,6151,6163,6173,6197,6199,6203,6211,6217,6221,6229,6247,6257,
-    6263,6269,6271,6277,6287,6299,6301,6311,6317,6323,6329,6337,6343,6353,
-    6359,6361,6367,6373,6379,6389,6397,6421,6427,6449,6451,6469,6473,6481,
-    6491,6521,6529,6547,6551,6553,6563,6569,6571,6577,6581,6599,6607,6619,
-    6637,6653,6659,6661,6673,6679,6689,6691,6701,6703,6709,6719,6733,6737,
-    6761,6763,6779,6781,6791,6793,6803,6823,6827,6829,6833,6841,6857,6863,
-    6869,6871,6883,6899,6907,6911,6917,6947,6949,6959,6961,6967,6971,6977,
-    6983,6991,6997,7001,7013,7019,7027,7039,7043,7057,7069,7079,7103,7109,
-    7121,7127,7129,7151,7159,7177,7187,7193,7207,7211,7213,7219,7229,7237,
-    7243,7247,7253,7283,7297,7307,7309,7321,7331,7333,7349,7351,7369,7393,
-    7411,7417,7433,7451,7457,7459,7477,7481,7487,7489,7499,7507,7517,7523,
-    7529,7537,7541,7547,7549,7559,7561,7573,7577,7583,7589,7591,7603,7607,
-    7621,7639,7643,7649,7669,7673,7681,7687,7691,7699,7703,7717,7723,7727,
-    7741,7753,7757,7759,7789,7793,7817,7823,7829,7841,7853,7867,7873,7877,
-    7879,7883,7901,7907,7919,7927,7933,7937,7949,7951,7963,7993,8009,8011,
-    8017,8039,8053,8059,8069,8081,8087,8089,8093,8101,8111,8117,8123,8147,
-    8161,8167,8171,8179,8191,8209,8219,8221,8231,8233,8237,8243,8263,8269,
-    8273,8287,8291,8293,8297,8311,8317,8329,8353,8363,8369,8377,8387,8389,
-    8419,8423,8429,8431,8443,8447,8461,8467,8501,8513,8521,8527,8537,8539,
-    8543,8563,8573,8581,8597,8599,8609,8623,8627,8629,8641,8647,8663,8669,
-    8677,8681,8689,8693,8699,8707,8713,8719,8731,8737,8741,8747,8753,8761,
-    8779,8783,8803,8807,8819,8821,8831,8837,8839,8849,8861,8863,8867,8887,
-    8893,8923,8929,8933,8941,8951,8963,8969,8971,8999,9001,9007,9011,9013,
-    9029,9041,9043,9049,9059,9067,9091,9103,9109,9127,9133,9137,9151,9157,
-    9161,9173,9181,9187,9199,9203,9209,9221,9227,9239,9241,9257,9277,9281,
-    9283,9293,9311,9319,9323,9337,9341,9343,9349,9371,9377,9391,9397,9403,
-    9413,9419,9421,9431,9433,9437,9439,9461,9463,9467,9473,9479,9491,9497,
-    9511,9521,9533,9539,9547,9551,9587,9601,9613,9619,9623,9629,9631,9643,
-    9649,9661,9677,9679,9689,9697,9719,9721,9733,9739,9743,9749,9767,9769,
-    9781,9787,9791,9803,9811,9817,9829,9833,9839,9851,9857,9859,9871,9883,
-    9887,9901,9907,9923,9929,9931,9941,9949,9967,9973,10007,10009,10037,
-    10039,10061,10067,10069,10079,10091,10093,10099,10103,10111,10133,10139,
-    10141,10151,10159,10163,10169,10177,10181,10193,10211,10223,10243,10247,
-    10253,10259,10267,10271,10273,10289,10301,10303,10313,10321,10331,10333,
-    10337,10343,10357,10369,10391,10399,10427,10429,10433,10453,10457,10459,
-    10463,10477,10487,10499,10501,10513,10529,10531,10559,10567,10589,10597,
-    10601,10607,10613,10627,10631,10639,10651,10657,10663,10667,10687,10691,
-    10709,10711,10723,10729,10733,10739,10753,10771,10781,10789,10799,10831,
-    10837,10847,10853,10859,10861,10867,10883,10889,10891,10903,10909,10937,
-    10939,10949,10957,10973,10979,10987,10993,11003,11027,11047,11057,11059,
-    11069,11071,11083,11087,11093,11113,11117,11119,11131,11149,11159,11161,
-    11171,11173,11177,11197,11213,11239,11243,11251,11257,11261,11273,11279,
-    11287,11299,11311,11317,11321,11329,11351,11353,11369,11383,11393,11399,
-    11411,11423,11437,11443,11447,11467,11471,11483,11489,11491,11497,11503,
-    11519,11527,11549,11551,11579,11587,11593,11597,11617,11621,11633,11657,
-    11677,11681,11689,11699,11701,11717,11719,11731,11743,11777,11779,11783,
-    11789,11801,11807,11813,11821,11827,11831,11833,11839,11863,11867,11887,
-    11897,11903,11909,11923,11927,11933,11939,11941,11953,11959,11969,11971,
-    11981,11987,12007,12011,12037,12041,12043,12049,12071,12073,12097,12101,
-    12107,12109,12113,12119,12143,12149,12157,12161,12163,12197,12203,12211,
-    12227,12239,12241,12251,12253,12263,12269,12277,12281,12289,12301,12323,
-    12329,12343,12347,12373,12377,12379,12391,12401,12409,12413,12421,12433,
-    12437,12451,12457,12473,12479,12487,12491,12497,12503,12511,12517,12527,
-    12539,12541,12547,12553,12569,12577,12583,12589,12601,12611,12613,12619,
-    12637,12641,12647,12653,12659,12671,12689,12697,12703,12713,12721,12739,
-    12743,12757,12763,12781,12791,12799,12809,12821,12823,12829,12841,12853,
-    12889,12893,12899,12907,12911,12917,12919,12923,12941,12953,12959,12967,
-    12973,12979,12983,13001,13003,13007,13009,13033,13037,13043,13049,13063,
-    13093,13099,13103,13109,13121,13127,13147,13151,13159,13163,13171,13177,
-    13183,13187,13217,13219,13229,13241,13249,13259,13267,13291,13297,13309,
-    13313,13327,13331,13337,13339,13367,13381,13397,13399,13411,13417,13421,
-    13441,13451,13457,13463,13469,13477,13487,13499,13513,13523,13537,13553,
-    13567,13577,13591,13597,13613,13619,13627,13633,13649,13669,13679,13681,
-    13687,13691,13693,13697,13709,13711,13721,13723,13729,13751,13757,13759,
-    13763,13781,13789,13799,13807,13829,13831,13841,13859,13873,13877,13879,
-    13883,13901,13903,13907,13913,13921,13931,13933,13963,13967,13997,13999,
-    14009,14011,14029,14033,14051,14057,14071,14081,14083,14087,14107,14143,
-    14149,14153,14159,14173,14177,14197,14207,14221,14243,14249,14251,14281,
-    14293,14303,14321,14323,14327,14341,14347,14369,14387,14389,14401,14407,
-    14411,14419,14423,14431,14437,14447,14449,14461,14479,14489,14503,14519,
-    14533,14537,14543,14549,14551,14557,14561,14563,14591,14593,14621,14627,
-    14629,14633,14639,14653,14657,14669,14683,14699,14713,14717,14723,14731,
-    14737,14741,14747,14753,14759,14767,14771,14779,14783,14797,14813,14821,
-    14827,14831,14843,14851,14867,14869,14879,14887,14891,14897,14923,14929,
-    14939,14947,14951,14957,14969,14983,15013,15017,15031,15053,15061,15073,
-    15077,15083,15091,15101,15107,15121,15131,15137,15139,15149,15161,15173,
-    15187,15193,15199,15217,15227,15233,15241,15259,15263,15269,15271,15277,
-    15287,15289,15299,15307,15313,15319,15329,15331,15349,15359,15361,15373,
-    15377,15383,15391,15401,15413,15427,15439,15443,15451,15461,15467,15473,
-    15493,15497,15511,15527,15541,15551,15559,15569,15581,15583,15601,15607,
-    15619,15629,15641,15643,15647,15649,15661,15667,15671,15679,15683,15727,
-    15731,15733,15737,15739,15749,15761,15767,15773,15787,15791,15797,15803,
-    15809,15817,15823,15859,15877,15881,15887,15889,15901,15907,15913,15919,
-    15923,15937,15959,15971,15973,15991,16001,16007,16033,16057,16061,16063,
-    16067,16069,16073,16087,16091,16097,16103,16111,16127,16139,16141,16183,
-    16187,16189,16193,16217,16223,16229,16231,16249,16253,16267,16273,16301,
-    16319,16333,16339,16349,16361,16363,16369,16381,16411,16417,16421,16427,
-    16433,16447,16451,16453,16477,16481,16487,16493,16519,16529,16547,16553,
-    16561,16567,16573,16603,16607,16619,16631,16633,16649,16651,16657,16661,
-    16673,16691,16693,16699,16703,16729,16741,16747,16759,16763,16787,16811,
-    16823,16829,16831,16843,16871,16879,16883,16889,16901,16903,16921,16927,
-    16931,16937,16943,16963,16979,16981,16987,16993,17011,17021,17027,17029,
-    17033,17041,17047,17053,17077,17093,17099,17107,17117,17123,17137,17159,
-    17167,17183,17189,17191,17203,17207,17209,17231,17239,17257,17291,17293,
-    17299,17317,17321,17327,17333,17341,17351,17359,17377,17383,17387,17389,
-    17393,17401,17417,17419,17431,17443,17449,17467,17471,17477,17483,17489,
-    17491,17497,17509,17519,17539,17551,17569,17573,17579,17581,17597,17599,
-    17609,17623,17627,17657,17659,17669,17681,17683,17707,17713,17729,17737,
-    17747,17749,17761,17783,17789,17791,17807,17827,17837,17839,17851,17863,
-    17881,17891,17903,17909,17911,17921,17923,17929,17939,17957,17959,17971,
-    17977,17981,17987,17989,18013,18041,18043,18047,18049,18059,18061,18077,
-    18089,18097,18119,18121,18127,18131,18133,18143,18149,18169,18181,18191,
-    18199,18211,18217,18223,18229,18233,18251,18253,18257,18269,18287,18289,
-    18301,18307,18311,18313,18329,18341,18353,18367,18371,18379,18397,18401,
-    18413,18427,18433,18439,18443,18451,18457,18461,18481,18493,18503,18517,
-    18521,18523,18539,18541,18553,18583,18587,18593,18617,18637,18661,18671,
-    18679,18691,18701,18713,18719,18731,18743,18749,18757,18773,18787,18793,
-    18797,18803,18839,18859,18869,18899,18911,18913,18917,18919,18947,18959,
-    18973,18979,19001,19009,19013,19031,19037,19051,19069,19073,19079,19081,
-    19087,19121,19139,19141,19157,19163,19181,19183,19207,19211,19213,19219,
-    19231,19237,19249,19259,19267,19273,19289,19301,19309,19319,19333,19373,
-    19379,19381,19387,19391,19403,19417,19421,19423,19427,19429,19433,19441,
-    19447,19457,19463,19469,19471,19477,19483,19489,19501,19507,19531,19541,
-    19543,19553,19559,19571,19577,19583,19597,19603,19609,19661,19681,19687,
-    19697,19699,19709,19717,19727,19739,19751,19753,19759,19763,19777,19793,
-    19801,19813,19819,19841,19843,19853,19861,19867,19889,19891,19913,19919,
-    19927,19937,19949,19961,19963,19973,19979,19991,19993,19997,20011,20021,
-    20023,20029,20047,20051,20063,20071,20089,20101,20107,20113,20117,20123,
-    20129,20143,20147,20149,20161,20173,20177,20183,20201,20219,20231,20233,
-    20249,20261,20269,20287,20297,20323,20327,20333,20341,20347,20353,20357,
-    20359,20369,20389,20393,20399,20407,20411,20431,20441,20443,20477,20479,
-    20483,20507,20509,20521,20533,20543,20549,20551,20563,20593,20599,20611,
-    20627,20639,20641,20663,20681,20693,20707,20717,20719,20731,20743,20747,
-    20749,20753,20759,20771,20773,20789,20807,20809,20849,20857,20873,20879,
-    20887,20897,20899,20903,20921,20929,20939,20947,20959,20963,20981,20983,
-    21001,21011,21013,21017,21019,21023,21031,21059,21061,21067,21089,21101,
-    21107,21121,21139,21143,21149,21157,21163,21169,21179,21187,21191,21193,
-    21211,21221,21227,21247,21269,21277,21283,21313,21317,21319,21323,21341,
-    21347,21377,21379,21383,21391,21397,21401,21407,21419,21433,21467,21481,
-    21487,21491,21493,21499,21503,21517,21521,21523,21529,21557,21559,21563,
-    21569,21577,21587,21589,21599,21601,21611,21613,21617,21647,21649,21661,
-    21673,21683,21701,21713,21727,21737,21739,21751,21757,21767,21773,21787,
-    21799,21803,21817,21821,21839,21841,21851,21859,21863,21871,21881,21893,
-    21911,21929,21937,21943,21961,21977,21991,21997,22003,22013,22027,22031,
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-    43913,43933,43943,43951,43961,43963,43969,43973,43987,43991,43997,44017,
-    44021,44027,44029,44041,44053,44059,44071,44087,44089,44101,44111,44119,
-    44123,44129,44131,44159,44171,44179,44189,44201,44203,44207,44221,44249,
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-    44773,44777,44789,44797,44809,44819,44839,44843,44851,44867,44879,44887,
-    44893,44909,44917,44927,44939,44953,44959,44963,44971,44983,44987,45007,
-    45013,45053,45061,45077,45083,45119,45121,45127,45131,45137,45139,45161,
-    45179,45181,45191,45197,45233,45247,45259,45263,45281,45289,45293,45307,
-    45317,45319,45329,45337,45341,45343,45361,45377,45389,45403,45413,45427,
-    45433,45439,45481,45491,45497,45503,45523,45533,45541,45553,45557,45569,
-    45587,45589,45599,45613,45631,45641,45659,45667,45673,45677,45691,45697,
-    45707,45737,45751,45757,45763,45767,45779,45817,45821,45823,45827,45833,
-    45841,45853,45863,45869,45887,45893,45943,45949,45953,45959,45971,45979,
-    45989,46021,46027,46049,46051,46061,46073,46091,46093,46099,46103,46133,
-    46141,46147,46153,46171,46181,46183,46187,46199,46219,46229,46237,46261,
-    46271,46273,46279,46301,46307,46309,46327,46337,46349,46351,46381,46399,
-    46411,46439,46441,46447,46451,46457,46471,46477,46489,46499,46507,46511,
-    46523,46549,46559,46567,46573,46589,46591,46601,46619,46633,46639,46643,
-    46649,46663,46679,46681,46687,46691,46703,46723,46727,46747,46751,46757,
-    46769,46771,46807,46811,46817,46819,46829,46831,46853,46861,46867,46877,
-    46889,46901,46919,46933,46957,46993,46997,47017,47041,47051,47057,47059,
-    47087,47093,47111,47119,47123,47129,47137,47143,47147,47149,47161,47189,
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+    54059, 54083, 54091, 54101, 54121, 54133, 54139, 54151, 54163,
+    54167, 54181, 54193, 54217, 54251, 54269, 54277, 54287, 54293,
+    54311, 54319, 54323, 54331, 54347, 54361, 54367, 54371, 54377,
+    54401, 54403, 54409, 54413, 54419, 54421, 54437, 54443, 54449,
+    54469, 54493, 54497, 54499, 54503, 54517, 54521, 54539, 54541,
+    54547, 54559, 54563, 54577, 54581, 54583, 54601, 54617, 54623,
+    54629, 54631, 54647, 54667, 54673, 54679, 54709, 54713, 54721,
+    54727, 54751, 54767, 54773, 54779, 54787, 54799, 54829, 54833,
+    54851, 54869, 54877, 54881, 54907, 54917, 54919, 54941, 54949,
+    54959, 54973, 54979, 54983, 55001, 55009, 55021, 55049, 55051,
+    55057, 55061, 55073, 55079, 55103, 55109, 55117, 55127, 55147,
+    55163, 55171, 55201, 55207, 55213, 55217, 55219, 55229, 55243,
+    55249, 55259, 55291, 55313, 55331, 55333, 55337, 55339, 55343,
+    55351, 55373, 55381, 55399, 55411, 55439, 55441, 55457, 55469,
+    55487, 55501, 55511, 55529, 55541, 55547, 55579, 55589, 55603,
+    55609, 55619, 55621, 55631, 55633, 55639, 55661, 55663, 55667,
+    55673, 55681, 55691, 55697, 55711, 55717, 55721, 55733, 55763,
+    55787, 55793, 55799, 55807, 55813, 55817, 55819, 55823, 55829,
+    55837, 55843, 55849, 55871, 55889, 55897, 55901, 55903, 55921,
+    55927, 55931, 55933, 55949, 55967, 55987, 55997, 56003, 56009,
+    56039, 56041, 56053, 56081, 56087, 56093, 56099, 56101, 56113,
+    56123, 56131, 56149, 56167, 56171, 56179, 56197, 56207, 56209,
+    56237, 56239, 56249, 56263, 56267, 56269, 56299, 56311, 56333,
+    56359, 56369, 56377, 56383, 56393, 56401, 56417, 56431, 56437,
+    56443, 56453, 56467, 56473, 56477, 56479, 56489, 56501, 56503,
+    56509, 56519, 56527, 56531, 56533, 56543, 56569, 56591, 56597,
+    56599, 56611, 56629, 56633, 56659, 56663, 56671, 56681, 56687,
+    56701, 56711, 56713, 56731, 56737, 56747, 56767, 56773, 56779,
+    56783, 56807, 56809, 56813, 56821, 56827, 56843, 56857, 56873,
+    56891, 56893, 56897, 56909, 56911, 56921, 56923, 56929, 56941,
+    56951, 56957, 56963, 56983, 56989, 56993, 56999, 57037, 57041,
+    57047, 57059, 57073, 57077, 57089, 57097, 57107, 57119, 57131,
+    57139, 57143, 57149, 57163, 57173, 57179, 57191, 57193, 57203,
+    57221, 57223, 57241, 57251, 57259, 57269, 57271, 57283, 57287,
+    57301, 57329, 57331, 57347, 57349, 57367, 57373, 57383, 57389,
+    57397, 57413, 57427, 57457, 57467, 57487, 57493, 57503, 57527,
+    57529, 57557, 57559, 57571, 57587, 57593, 57601, 57637, 57641,
+    57649, 57653, 57667, 57679, 57689, 57697, 57709, 57713, 57719,
+    57727, 57731, 57737, 57751, 57773, 57781, 57787, 57791, 57793,
+    57803, 57809, 57829, 57839, 57847, 57853, 57859, 57881, 57899,
+    57901, 57917, 57923, 57943, 57947, 57973, 57977, 57991, 58013,
+    58027, 58031, 58043, 58049, 58057, 58061, 58067, 58073, 58099,
+    58109, 58111, 58129, 58147, 58151, 58153, 58169, 58171, 58189,
+    58193, 58199, 58207, 58211, 58217, 58229, 58231, 58237, 58243,
+    58271, 58309, 58313, 58321, 58337, 58363, 58367, 58369, 58379,
+    58391, 58393, 58403, 58411, 58417, 58427, 58439, 58441, 58451,
+    58453, 58477, 58481, 58511, 58537, 58543, 58549, 58567, 58573,
+    58579, 58601, 58603, 58613, 58631, 58657, 58661, 58679, 58687,
+    58693, 58699, 58711, 58727, 58733, 58741, 58757, 58763, 58771,
+    58787, 58789, 58831, 58889, 58897, 58901, 58907, 58909, 58913,
+    58921, 58937, 58943, 58963, 58967, 58979, 58991, 58997, 59009,
+    59011, 59021, 59023, 59029, 59051, 59053, 59063, 59069, 59077,
+    59083, 59093, 59107, 59113, 59119, 59123, 59141, 59149, 59159,
+    59167, 59183, 59197, 59207, 59209, 59219, 59221, 59233, 59239,
+    59243, 59263, 59273, 59281, 59333, 59341, 59351, 59357, 59359,
+    59369, 59377, 59387, 59393, 59399, 59407, 59417, 59419, 59441,
+    59443, 59447, 59453, 59467, 59471, 59473, 59497, 59509, 59513,
+    59539, 59557, 59561, 59567, 59581, 59611, 59617, 59621, 59627,
+    59629, 59651, 59659, 59663, 59669, 59671, 59693, 59699, 59707,
+    59723, 59729, 59743, 59747, 59753, 59771, 59779, 59791, 59797,
+    59809, 59833, 59863, 59879, 59887, 59921, 59929, 59951, 59957,
+    59971, 59981, 59999, 60013, 60017, 60029, 60037, 60041, 60077,
+    60083, 60089, 60091, 60101, 60103, 60107, 60127, 60133, 60139,
+    60149, 60161, 60167, 60169, 60209, 60217, 60223, 60251, 60257,
+    60259, 60271, 60289, 60293, 60317, 60331, 60337, 60343, 60353,
+    60373, 60383, 60397, 60413, 60427, 60443, 60449, 60457, 60493,
+    60497, 60509, 60521, 60527, 60539, 60589, 60601, 60607, 60611,
+    60617, 60623, 60631, 60637, 60647, 60649, 60659, 60661, 60679,
+    60689, 60703, 60719, 60727, 60733, 60737, 60757, 60761, 60763,
+    60773, 60779, 60793, 60811, 60821, 60859, 60869, 60887, 60889,
+    60899, 60901, 60913, 60917, 60919, 60923, 60937, 60943, 60953,
+    60961, 61001, 61007, 61027, 61031, 61043, 61051, 61057, 61091,
+    61099, 61121, 61129, 61141, 61151, 61153, 61169, 61211, 61223,
+    61231, 61253, 61261, 61283, 61291, 61297, 61331, 61333, 61339,
+    61343, 61357, 61363, 61379, 61381, 61403, 61409, 61417, 61441,
+    61463, 61469, 61471, 61483, 61487, 61493, 61507, 61511, 61519,
+    61543, 61547, 61553, 61559, 61561, 61583, 61603, 61609, 61613,
+    61627, 61631, 61637, 61643, 61651, 61657, 61667, 61673, 61681,
+    61687, 61703, 61717, 61723, 61729, 61751, 61757, 61781, 61813,
+    61819, 61837, 61843, 61861, 61871, 61879, 61909, 61927, 61933,
+    61949, 61961, 61967, 61979, 61981, 61987, 61991, 62003, 62011,
+    62017, 62039, 62047, 62053, 62057, 62071, 62081, 62099, 62119,
+    62129, 62131, 62137, 62141, 62143, 62171, 62189, 62191, 62201,
+    62207, 62213, 62219, 62233, 62273, 62297, 62299, 62303, 62311,
+    62323, 62327, 62347, 62351, 62383, 62401, 62417, 62423, 62459,
+    62467, 62473, 62477, 62483, 62497, 62501, 62507, 62533, 62539,
+    62549, 62563, 62581, 62591, 62597, 62603, 62617, 62627, 62633,
+    62639, 62653, 62659, 62683, 62687, 62701, 62723, 62731, 62743,
+    62753, 62761, 62773, 62791, 62801, 62819, 62827, 62851, 62861,
+    62869, 62873, 62897, 62903, 62921, 62927, 62929, 62939, 62969,
+    62971, 62981, 62983, 62987, 62989, 63029, 63031, 63059, 63067,
+    63073, 63079, 63097, 63103, 63113, 63127, 63131, 63149, 63179,
+    63197, 63199, 63211, 63241, 63247, 63277, 63281, 63299, 63311,
+    63313, 63317, 63331, 63337, 63347, 63353, 63361, 63367, 63377,
+    63389, 63391, 63397, 63409, 63419, 63421, 63439, 63443, 63463,
+    63467, 63473, 63487, 63493, 63499, 63521, 63527, 63533, 63541,
+    63559, 63577, 63587, 63589, 63599, 63601, 63607, 63611, 63617,
+    63629, 63647, 63649, 63659, 63667, 63671, 63689, 63691, 63697,
+    63703, 63709, 63719, 63727, 63737, 63743, 63761, 63773, 63781,
+    63793, 63799, 63803, 63809, 63823, 63839, 63841, 63853, 63857,
+    63863, 63901, 63907, 63913, 63929, 63949, 63977, 63997, 64007,
+    64013, 64019, 64033, 64037, 64063, 64067, 64081, 64091, 64109,
+    64123, 64151, 64153, 64157, 64171, 64187, 64189, 64217, 64223,
+    64231, 64237, 64271, 64279, 64283, 64301, 64303, 64319, 64327,
+    64333, 64373, 64381, 64399, 64403, 64433, 64439, 64451, 64453,
+    64483, 64489, 64499, 64513, 64553, 64567, 64577, 64579, 64591,
+    64601, 64609, 64613, 64621, 64627, 64633, 64661, 64663, 64667,
+    64679, 64693, 64709, 64717, 64747, 64763, 64781, 64783, 64793,
+    64811, 64817, 64849, 64853, 64871, 64877, 64879, 64891, 64901,
+    64919, 64921, 64927, 64937, 64951, 64969, 64997, 65003, 65011,
+    65027, 65029, 65033, 65053, 65063, 65071, 65089, 65099, 65101,
+    65111, 65119, 65123, 65129, 65141, 65147, 65167, 65171, 65173,
+    65179, 65183, 65203, 65213, 65239, 65257, 65267, 65269, 65287,
+    65293, 65309, 65323, 65327, 65353, 65357, 65371, 65381, 65393,
+    65407, 65413, 65419, 65423, 65437, 65447, 65449, 65479, 65497,
+    65519, 65521,
 };
 
 #define NPRIMES (sizeof(primes) / sizeof(*primes))
 
 /*
- * Generate a prime. We arrange to select a prime with the property
- * (prime % modulus) != residue (to speed up use in RSA).
+ * Generate a prime. We can deal with various extra properties of
+ * the prime:
+ * 
+ *  - to speed up use in RSA, we can arrange to select a prime with
+ *    the property (prime % modulus) != residue.
+ * 
+ *  - for use in DSA, we can arrange to select a prime which is one
+ *    more than a multiple of a dirty great bignum. In this case
+ *    `bits' gives the size of the factor by which we _multiply_
+ *    that bignum, rather than the size of the whole number.
+ *
+ *  - for the basically cosmetic purposes of generating keys of the
+ *    length actually specified rather than off by one bit, we permit
+ *    the caller to provide an unsigned integer 'firstbits' which will
+ *    match the top few bits of the returned prime. (That is, there
+ *    will exist some n such that (returnvalue >> n) == firstbits.) If
+ *    'firstbits' is not needed, specifying it to either 0 or 1 is
+ *    an adequate no-op.
  */
-Bignum primegen(int bits, int modulus, int residue,
-                int phase, progfn_t pfn, void *pfnparam) {
-    int i, k, v, byte, bitsleft, check, checks;
-    unsigned long delta, moduli[NPRIMES+1], residues[NPRIMES+1];
+Bignum primegen(int bits, int modulus, int residue, Bignum factor,
+               int phase, progfn_t pfn, void *pfnparam, unsigned firstbits)
+{
+    int i, k, v, byte, bitsleft, check, checks, fbsize;
+    unsigned long delta;
+    unsigned long moduli[NPRIMES + 1];
+    unsigned long residues[NPRIMES + 1];
+    unsigned long multipliers[NPRIMES + 1];
     Bignum p, pm1, q, wqp, wqp2;
     int progress = 0;
 
-    byte = 0; bitsleft = 0;
+    byte = 0;
+    bitsleft = 0;
+
+    fbsize = 0;
+    while (firstbits >> fbsize)        /* work out how to align this */
+        fbsize++;
 
-    STARTOVER:
+  STARTOVER:
 
-    pfn(pfnparam, phase, ++progress);
+    pfn(pfnparam, PROGFN_PROGRESS, phase, ++progress);
 
     /*
      * Generate a k-bit random number with top and bottom bits set.
+     * Alternatively, if `factor' is nonzero, generate a k-bit
+     * random number with the top bit set and the bottom bit clear,
+     * multiply it by `factor', and add one.
      */
-    p = newbn((bits+15)/16);
+    p = bn_power_2(bits - 1);
     for (i = 0; i < bits; i++) {
-        if (i == 0 || i == bits-1)
-            v = 1;
-        else {
-            if (bitsleft <= 0)
-                bitsleft = 8; byte = random_byte();
-            v = byte & 1;
-            byte >>= 1;
-            bitsleft--;
-        }
-        bignum_set_bit(p, i, v);
+       if (i == 0 || i == bits - 1) {
+           v = (i != 0 || !factor) ? 1 : 0;
+        } else if (i >= bits - fbsize) {
+            v = (firstbits >> (i - (bits - fbsize))) & 1;
+        } else {
+           if (bitsleft <= 0)
+               bitsleft = 8, byte = random_byte();
+           v = byte & 1;
+           byte >>= 1;
+           bitsleft--;
+       }
+       bignum_set_bit(p, i, v);
+    }
+    if (factor) {
+       Bignum tmp = p;
+       p = bigmul(tmp, factor);
+       freebn(tmp);
+       assert(bignum_bit(p, 0) == 0);
+       bignum_set_bit(p, 0, 1);
     }
 
     /*
      * Ensure this random number is coprime to the first few
-     * primes, by repeatedly adding 2 to it until it is.
+     * primes, by repeatedly adding either 2 or 2*factor to it
+     * until it is.
      */
     for (i = 0; i < NPRIMES; i++) {
-        moduli[i] = primes[i];
-        residues[i] = bignum_mod_short(p, primes[i]);
+       moduli[i] = primes[i];
+       residues[i] = bignum_mod_short(p, primes[i]);
+       if (factor)
+           multipliers[i] = bignum_mod_short(factor, primes[i]);
+       else
+           multipliers[i] = 1;
     }
     moduli[NPRIMES] = modulus;
-    residues[NPRIMES] = (bignum_mod_short(p, (unsigned short)modulus)
-                         + modulus - residue);
+    residues[NPRIMES] = (bignum_mod_short(p, (unsigned short) modulus)
+                        + modulus - residue);
+    if (factor)
+       multipliers[NPRIMES] = bignum_mod_short(factor, modulus);
+    else
+       multipliers[NPRIMES] = 1;
     delta = 0;
     while (1) {
-        for (i = 0; i < (sizeof(moduli) / sizeof(*moduli)); i++)
-            if (!((residues[i] + delta) % moduli[i]))
-                break;
-        if (i < (sizeof(moduli) / sizeof(*moduli))) {/* we broke */
-            delta += 2;
-            if (delta < 2) {
-                freebn(p);
-                goto STARTOVER;
-            }
-            continue;
-        }
-        break;
+       for (i = 0; i < (sizeof(moduli) / sizeof(*moduli)); i++)
+           if (!((residues[i] + delta * multipliers[i]) % moduli[i]))
+               break;
+       if (i < (sizeof(moduli) / sizeof(*moduli))) {   /* we broke */
+           delta += 2;
+           if (delta > 65536) {
+               freebn(p);
+               goto STARTOVER;
+           }
+           continue;
+       }
+       break;
     }
     q = p;
-    p = bignum_add_long(q, delta);
+    if (factor) {
+       Bignum tmp;
+       tmp = bignum_from_long(delta);
+       p = bigmuladd(tmp, factor, q);
+       freebn(tmp);
+    } else {
+       p = bignum_add_long(q, delta);
+    }
     freebn(q);
 
     /*
@@ -723,22 +949,34 @@ Bignum primegen(int bits, int modulus, int residue,
      * work out how many checks are needed.
      */
     checks = 27;
-    if (bits >= 150) checks = 18;
-    if (bits >= 200) checks = 15;
-    if (bits >= 250) checks = 12;
-    if (bits >= 300) checks = 9;
-    if (bits >= 350) checks = 8;
-    if (bits >= 400) checks = 7;
-    if (bits >= 450) checks = 6;
-    if (bits >= 550) checks = 5;
-    if (bits >= 650) checks = 4;
-    if (bits >= 850) checks = 3;
-    if (bits >= 1300) checks = 2;
+    if (bits >= 150)
+       checks = 18;
+    if (bits >= 200)
+       checks = 15;
+    if (bits >= 250)
+       checks = 12;
+    if (bits >= 300)
+       checks = 9;
+    if (bits >= 350)
+       checks = 8;
+    if (bits >= 400)
+       checks = 7;
+    if (bits >= 450)
+       checks = 6;
+    if (bits >= 550)
+       checks = 5;
+    if (bits >= 650)
+       checks = 4;
+    if (bits >= 850)
+       checks = 3;
+    if (bits >= 1300)
+       checks = 2;
 
     /*
      * Next, write p-1 as q*2^k.
      */
-    for (k = 0; bignum_bit(p, k) == !k; k++);   /* find first 1 bit in p-1 */
+    for (k = 0; bignum_bit(p, k) == !k; k++)
+       continue;       /* find first 1 bit in p-1 */
     q = bignum_rshift(p, k);
     /* And store p-1 itself, which we'll need. */
     pm1 = copybn(p);
@@ -748,64 +986,66 @@ Bignum primegen(int bits, int modulus, int residue,
      * Now, for each check ...
      */
     for (check = 0; check < checks; check++) {
-        Bignum w;
+       Bignum w;
 
-        /*
-         * Invent a random number between 1 and p-1 inclusive.
-         */
-        while (1) {
-            w = newbn((bits+15)/16);
-            for (i = 0; i < bits; i++) {
-                if (bitsleft <= 0)
-                    bitsleft = 8; byte = random_byte();
-                v = byte & 1;
-                byte >>= 1;
-                bitsleft--;
-                bignum_set_bit(w, i, v);
-            }
-            if (bignum_cmp(w, p) >= 0 || bignum_cmp(w, Zero) == 0) {
-                freebn(w);
-                continue;
-            }
-            break;
-        }
+       /*
+        * Invent a random number between 1 and p-1 inclusive.
+        */
+       while (1) {
+           w = bn_power_2(bits - 1);
+           for (i = 0; i < bits; i++) {
+               if (bitsleft <= 0)
+                   bitsleft = 8, byte = random_byte();
+               v = byte & 1;
+               byte >>= 1;
+               bitsleft--;
+               bignum_set_bit(w, i, v);
+           }
+           bn_restore_invariant(w);
+           if (bignum_cmp(w, p) >= 0 || bignum_cmp(w, Zero) == 0) {
+               freebn(w);
+               continue;
+           }
+           break;
+       }
 
-        pfn(pfnparam, phase, ++progress);
+       pfn(pfnparam, PROGFN_PROGRESS, phase, ++progress);
 
-        /*
-         * Compute w^q mod p.
-         */
-        wqp = modpow(w, q, p);
-        freebn(w);
+       /*
+        * Compute w^q mod p.
+        */
+       wqp = modpow(w, q, p);
+       freebn(w);
 
-        /*
-         * See if this is 1, or if it is -1, or if it becomes -1
-         * when squared at most k-1 times.
-         */
-        if (bignum_cmp(wqp, One) == 0 || bignum_cmp(wqp, pm1) == 0) {
-            freebn(wqp);
-            continue;
-        }
-        for (i = 0; i < k-1; i++) {
-            wqp2 = modmul(wqp, wqp, p);
-            freebn(wqp);
-            wqp = wqp2;
-            if (bignum_cmp(wqp, pm1) == 0)
-                break;
-        }
-        if (i < k-1) {
-            freebn(wqp);
-            continue;
-        }
+       /*
+        * See if this is 1, or if it is -1, or if it becomes -1
+        * when squared at most k-1 times.
+        */
+       if (bignum_cmp(wqp, One) == 0 || bignum_cmp(wqp, pm1) == 0) {
+           freebn(wqp);
+           continue;
+       }
+       for (i = 0; i < k - 1; i++) {
+           wqp2 = modmul(wqp, wqp, p);
+           freebn(wqp);
+           wqp = wqp2;
+           if (bignum_cmp(wqp, pm1) == 0)
+               break;
+       }
+       if (i < k - 1) {
+           freebn(wqp);
+           continue;
+       }
 
-        /*
-         * It didn't. Therefore, w is a witness for the
-         * compositeness of p.
-         */
-        freebn(p);
-        freebn(pm1);
-        freebn(q);
-        goto STARTOVER;
+       /*
+        * It didn't. Therefore, w is a witness for the
+        * compositeness of p.
+        */
+       freebn(wqp);
+       freebn(p);
+       freebn(pm1);
+       freebn(q);
+       goto STARTOVER;
     }
 
     /*
@@ -815,3 +1055,32 @@ Bignum primegen(int bits, int modulus, int residue,
     freebn(pm1);
     return p;
 }
+
+/*
+ * Invent a pair of values suitable for use as 'firstbits' in the
+ * above function, such that their product is at least 2.
+ *
+ * This is used for generating both RSA and DSA keys which have
+ * exactly the specified number of bits rather than one fewer - if you
+ * generate an a-bit and a b-bit number completely at random and
+ * multiply them together, you could end up with either an (ab-1)-bit
+ * number or an (ab)-bit number. The former happens log(2)*2-1 of the
+ * time (about 39%) and, though actually harmless, every time it
+ * occurs it has a non-zero probability of sparking a user email along
+ * the lines of 'Hey, I asked PuTTYgen for a 2048-bit key and I only
+ * got 2047 bits! Bug!'
+ */
+void invent_firstbits(unsigned *one, unsigned *two)
+{
+    /*
+     * Our criterion is that any number in the range [one,one+1)
+     * multiplied by any number in the range [two,two+1) should have
+     * the highest bit set. It should be clear that we can trivially
+     * test this by multiplying the smallest values in each interval,
+     * i.e. the ones we actually invented.
+     */
+    do {
+        *one = 0x100 | random_byte();
+        *two = 0x100 | random_byte();
+    } while (*one * *two < 0x20000);
+}