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author | David Walter Seikel | 2011-06-27 15:59:06 +1000 |
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committer | David Walter Seikel | 2011-06-27 15:59:06 +1000 |
commit | 92bd9b2503e7dd927f416cb9b17f169ea925fa56 (patch) | |
tree | f0f3776cfc0c6e6224db66f5678387c580095f16 /linden/indra/libgcrypt/libgcrypt-1.2.2/mpi/mpi-mpow.c | |
parent | Make use of the new packaging stuff from upstream. (diff) | |
download | meta-impy-92bd9b2503e7dd927f416cb9b17f169ea925fa56.zip meta-impy-92bd9b2503e7dd927f416cb9b17f169ea925fa56.tar.gz meta-impy-92bd9b2503e7dd927f416cb9b17f169ea925fa56.tar.bz2 meta-impy-92bd9b2503e7dd927f416cb9b17f169ea925fa56.tar.xz |
Clean up line endings, execute bits, and other bits of errant nonsense from Windows.
Diffstat (limited to '')
-rw-r--r--[-rwxr-xr-x] | linden/indra/libgcrypt/libgcrypt-1.2.2/mpi/mpi-mpow.c | 448 |
1 files changed, 224 insertions, 224 deletions
diff --git a/linden/indra/libgcrypt/libgcrypt-1.2.2/mpi/mpi-mpow.c b/linden/indra/libgcrypt/libgcrypt-1.2.2/mpi/mpi-mpow.c index 463dee8..f37c6f9 100755..100644 --- a/linden/indra/libgcrypt/libgcrypt-1.2.2/mpi/mpi-mpow.c +++ b/linden/indra/libgcrypt/libgcrypt-1.2.2/mpi/mpi-mpow.c | |||
@@ -1,224 +1,224 @@ | |||
1 | /* mpi-mpow.c - MPI functions | 1 | /* mpi-mpow.c - MPI functions |
2 | * Copyright (C) 1998, 1999, 2001, 2002, 2003 Free Software Foundation, Inc. | 2 | * Copyright (C) 1998, 1999, 2001, 2002, 2003 Free Software Foundation, Inc. |
3 | * | 3 | * |
4 | * This file is part of Libgcrypt. | 4 | * This file is part of Libgcrypt. |
5 | * | 5 | * |
6 | * Libgcrypt is free software; you can redistribute it and/or modify | 6 | * Libgcrypt is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU Lesser General Public License as | 7 | * it under the terms of the GNU Lesser General Public License as |
8 | * published by the Free Software Foundation; either version 2.1 of | 8 | * published by the Free Software Foundation; either version 2.1 of |
9 | * the License, or (at your option) any later version. | 9 | * the License, or (at your option) any later version. |
10 | * | 10 | * |
11 | * Libgcrypt is distributed in the hope that it will be useful, | 11 | * Libgcrypt is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | * GNU Lesser General Public License for more details. | 14 | * GNU Lesser General Public License for more details. |
15 | * | 15 | * |
16 | * You should have received a copy of the GNU Lesser General Public | 16 | * You should have received a copy of the GNU Lesser General Public |
17 | * License along with this program; if not, write to the Free Software | 17 | * License along with this program; if not, write to the Free Software |
18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA | 18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA |
19 | */ | 19 | */ |
20 | 20 | ||
21 | #include <config.h> | 21 | #include <config.h> |
22 | #include <stdio.h> | 22 | #include <stdio.h> |
23 | #include <stdlib.h> | 23 | #include <stdlib.h> |
24 | #include "mpi-internal.h" | 24 | #include "mpi-internal.h" |
25 | #include "longlong.h" | 25 | #include "longlong.h" |
26 | #include "g10lib.h" | 26 | #include "g10lib.h" |
27 | #include <assert.h> | 27 | #include <assert.h> |
28 | 28 | ||
29 | 29 | ||
30 | /* Barrett is slower than the classical way. It can be tweaked by | 30 | /* Barrett is slower than the classical way. It can be tweaked by |
31 | * using partial multiplications | 31 | * using partial multiplications |
32 | */ | 32 | */ |
33 | /*#define USE_BARRETT*/ | 33 | /*#define USE_BARRETT*/ |
34 | 34 | ||
35 | 35 | ||
36 | 36 | ||
37 | #ifdef USE_BARRETT | 37 | #ifdef USE_BARRETT |
38 | static void barrett_mulm( gcry_mpi_t w, gcry_mpi_t u, gcry_mpi_t v, gcry_mpi_t m, gcry_mpi_t y, int k, gcry_mpi_t r1, gcry_mpi_t r2 ); | 38 | static void barrett_mulm( gcry_mpi_t w, gcry_mpi_t u, gcry_mpi_t v, gcry_mpi_t m, gcry_mpi_t y, int k, gcry_mpi_t r1, gcry_mpi_t r2 ); |
39 | static gcry_mpi_t init_barrett( gcry_mpi_t m, int *k, gcry_mpi_t *r1, gcry_mpi_t *r2 ); | 39 | static gcry_mpi_t init_barrett( gcry_mpi_t m, int *k, gcry_mpi_t *r1, gcry_mpi_t *r2 ); |
40 | static int calc_barrett( gcry_mpi_t r, gcry_mpi_t x, gcry_mpi_t m, gcry_mpi_t y, int k, gcry_mpi_t r1, gcry_mpi_t r2 ); | 40 | static int calc_barrett( gcry_mpi_t r, gcry_mpi_t x, gcry_mpi_t m, gcry_mpi_t y, int k, gcry_mpi_t r1, gcry_mpi_t r2 ); |
41 | #else | 41 | #else |
42 | #define barrett_mulm( w, u, v, m, y, k, r1, r2 ) gcry_mpi_mulm( (w), (u), (v), (m) ) | 42 | #define barrett_mulm( w, u, v, m, y, k, r1, r2 ) gcry_mpi_mulm( (w), (u), (v), (m) ) |
43 | #endif | 43 | #endif |
44 | 44 | ||
45 | 45 | ||
46 | static int | 46 | static int |
47 | build_index( gcry_mpi_t *exparray, int k, int i, int t ) | 47 | build_index( gcry_mpi_t *exparray, int k, int i, int t ) |
48 | { | 48 | { |
49 | int j, bitno; | 49 | int j, bitno; |
50 | int idx = 0; | 50 | int idx = 0; |
51 | 51 | ||
52 | bitno = t-i; | 52 | bitno = t-i; |
53 | for(j=k-1; j >= 0; j-- ) { | 53 | for(j=k-1; j >= 0; j-- ) { |
54 | idx <<= 1; | 54 | idx <<= 1; |
55 | if( mpi_test_bit( exparray[j], bitno ) ) | 55 | if( mpi_test_bit( exparray[j], bitno ) ) |
56 | idx |= 1; | 56 | idx |= 1; |
57 | } | 57 | } |
58 | /*log_debug("t=%d i=%d idx=%d\n", t, i, idx );*/ | 58 | /*log_debug("t=%d i=%d idx=%d\n", t, i, idx );*/ |
59 | return idx; | 59 | return idx; |
60 | } | 60 | } |
61 | 61 | ||
62 | /**************** | 62 | /**************** |
63 | * RES = (BASE[0] ^ EXP[0]) * (BASE[1] ^ EXP[1]) * ... * mod M | 63 | * RES = (BASE[0] ^ EXP[0]) * (BASE[1] ^ EXP[1]) * ... * mod M |
64 | */ | 64 | */ |
65 | void | 65 | void |
66 | _gcry_mpi_mulpowm( gcry_mpi_t res, gcry_mpi_t *basearray, gcry_mpi_t *exparray, gcry_mpi_t m) | 66 | _gcry_mpi_mulpowm( gcry_mpi_t res, gcry_mpi_t *basearray, gcry_mpi_t *exparray, gcry_mpi_t m) |
67 | { | 67 | { |
68 | int k; /* number of elements */ | 68 | int k; /* number of elements */ |
69 | int t; /* bit size of largest exponent */ | 69 | int t; /* bit size of largest exponent */ |
70 | int i, j, idx; | 70 | int i, j, idx; |
71 | gcry_mpi_t *G; /* table with precomputed values of size 2^k */ | 71 | gcry_mpi_t *G; /* table with precomputed values of size 2^k */ |
72 | gcry_mpi_t tmp; | 72 | gcry_mpi_t tmp; |
73 | #ifdef USE_BARRETT | 73 | #ifdef USE_BARRETT |
74 | gcry_mpi_t barrett_y, barrett_r1, barrett_r2; | 74 | gcry_mpi_t barrett_y, barrett_r1, barrett_r2; |
75 | int barrett_k; | 75 | int barrett_k; |
76 | #endif | 76 | #endif |
77 | 77 | ||
78 | for(k=0; basearray[k]; k++ ) | 78 | for(k=0; basearray[k]; k++ ) |
79 | ; | 79 | ; |
80 | assert(k); | 80 | assert(k); |
81 | for(t=0, i=0; (tmp=exparray[i]); i++ ) { | 81 | for(t=0, i=0; (tmp=exparray[i]); i++ ) { |
82 | /*log_mpidump("exp: ", tmp );*/ | 82 | /*log_mpidump("exp: ", tmp );*/ |
83 | j = mpi_get_nbits(tmp); | 83 | j = mpi_get_nbits(tmp); |
84 | if( j > t ) | 84 | if( j > t ) |
85 | t = j; | 85 | t = j; |
86 | } | 86 | } |
87 | /*log_mpidump("mod: ", m );*/ | 87 | /*log_mpidump("mod: ", m );*/ |
88 | assert(i==k); | 88 | assert(i==k); |
89 | assert(t); | 89 | assert(t); |
90 | assert( k < 10 ); | 90 | assert( k < 10 ); |
91 | 91 | ||
92 | G = gcry_xcalloc( (1<<k) , sizeof *G ); | 92 | G = gcry_xcalloc( (1<<k) , sizeof *G ); |
93 | #ifdef USE_BARRETT | 93 | #ifdef USE_BARRETT |
94 | barrett_y = init_barrett( m, &barrett_k, &barrett_r1, &barrett_r2 ); | 94 | barrett_y = init_barrett( m, &barrett_k, &barrett_r1, &barrett_r2 ); |
95 | #endif | 95 | #endif |
96 | /* and calculate */ | 96 | /* and calculate */ |
97 | tmp = mpi_alloc( mpi_get_nlimbs(m)+1 ); | 97 | tmp = mpi_alloc( mpi_get_nlimbs(m)+1 ); |
98 | mpi_set_ui( res, 1 ); | 98 | mpi_set_ui( res, 1 ); |
99 | for(i = 1; i <= t; i++ ) { | 99 | for(i = 1; i <= t; i++ ) { |
100 | barrett_mulm(tmp, res, res, m, barrett_y, barrett_k, | 100 | barrett_mulm(tmp, res, res, m, barrett_y, barrett_k, |
101 | barrett_r1, barrett_r2 ); | 101 | barrett_r1, barrett_r2 ); |
102 | idx = build_index( exparray, k, i, t ); | 102 | idx = build_index( exparray, k, i, t ); |
103 | assert( idx >= 0 && idx < (1<<k) ); | 103 | assert( idx >= 0 && idx < (1<<k) ); |
104 | if( !G[idx] ) { | 104 | if( !G[idx] ) { |
105 | if( !idx ) | 105 | if( !idx ) |
106 | G[0] = mpi_alloc_set_ui( 1 ); | 106 | G[0] = mpi_alloc_set_ui( 1 ); |
107 | else { | 107 | else { |
108 | for(j=0; j < k; j++ ) { | 108 | for(j=0; j < k; j++ ) { |
109 | if( (idx & (1<<j) ) ) { | 109 | if( (idx & (1<<j) ) ) { |
110 | if( !G[idx] ) | 110 | if( !G[idx] ) |
111 | G[idx] = mpi_copy( basearray[j] ); | 111 | G[idx] = mpi_copy( basearray[j] ); |
112 | else | 112 | else |
113 | barrett_mulm( G[idx], G[idx], basearray[j], | 113 | barrett_mulm( G[idx], G[idx], basearray[j], |
114 | m, barrett_y, barrett_k, barrett_r1, barrett_r2 ); | 114 | m, barrett_y, barrett_k, barrett_r1, barrett_r2 ); |
115 | } | 115 | } |
116 | } | 116 | } |
117 | if( !G[idx] ) | 117 | if( !G[idx] ) |
118 | G[idx] = mpi_alloc(0); | 118 | G[idx] = mpi_alloc(0); |
119 | } | 119 | } |
120 | } | 120 | } |
121 | barrett_mulm(res, tmp, G[idx], m, barrett_y, barrett_k, barrett_r1, barrett_r2 ); | 121 | barrett_mulm(res, tmp, G[idx], m, barrett_y, barrett_k, barrett_r1, barrett_r2 ); |
122 | } | 122 | } |
123 | 123 | ||
124 | /* cleanup */ | 124 | /* cleanup */ |
125 | mpi_free(tmp); | 125 | mpi_free(tmp); |
126 | #ifdef USE_BARRETT | 126 | #ifdef USE_BARRETT |
127 | mpi_free(barrett_y); | 127 | mpi_free(barrett_y); |
128 | mpi_free(barrett_r1); | 128 | mpi_free(barrett_r1); |
129 | mpi_free(barrett_r2); | 129 | mpi_free(barrett_r2); |
130 | #endif | 130 | #endif |
131 | for(i=0; i < (1<<k); i++ ) | 131 | for(i=0; i < (1<<k); i++ ) |
132 | mpi_free(G[i]); | 132 | mpi_free(G[i]); |
133 | gcry_free(G); | 133 | gcry_free(G); |
134 | } | 134 | } |
135 | 135 | ||
136 | 136 | ||
137 | 137 | ||
138 | #ifdef USE_BARRETT | 138 | #ifdef USE_BARRETT |
139 | static void | 139 | static void |
140 | barrett_mulm( gcry_mpi_t w, gcry_mpi_t u, gcry_mpi_t v, gcry_mpi_t m, gcry_mpi_t y, int k, gcry_mpi_t r1, gcry_mpi_t r2 ) | 140 | barrett_mulm( gcry_mpi_t w, gcry_mpi_t u, gcry_mpi_t v, gcry_mpi_t m, gcry_mpi_t y, int k, gcry_mpi_t r1, gcry_mpi_t r2 ) |
141 | { | 141 | { |
142 | mpi_mul(w, u, v); | 142 | mpi_mul(w, u, v); |
143 | if( calc_barrett( w, w, m, y, k, r1, r2 ) ) | 143 | if( calc_barrett( w, w, m, y, k, r1, r2 ) ) |
144 | mpi_fdiv_r( w, w, m ); | 144 | mpi_fdiv_r( w, w, m ); |
145 | } | 145 | } |
146 | 146 | ||
147 | /**************** | 147 | /**************** |
148 | * Barrett precalculation: y = floor(b^(2k) / m) | 148 | * Barrett precalculation: y = floor(b^(2k) / m) |
149 | */ | 149 | */ |
150 | static gcry_mpi_t | 150 | static gcry_mpi_t |
151 | init_barrett( gcry_mpi_t m, int *k, gcry_mpi_t *r1, gcry_mpi_t *r2 ) | 151 | init_barrett( gcry_mpi_t m, int *k, gcry_mpi_t *r1, gcry_mpi_t *r2 ) |
152 | { | 152 | { |
153 | gcry_mpi_t tmp; | 153 | gcry_mpi_t tmp; |
154 | 154 | ||
155 | mpi_normalize( m ); | 155 | mpi_normalize( m ); |
156 | *k = mpi_get_nlimbs( m ); | 156 | *k = mpi_get_nlimbs( m ); |
157 | tmp = mpi_alloc( *k + 1 ); | 157 | tmp = mpi_alloc( *k + 1 ); |
158 | mpi_set_ui( tmp, 1 ); | 158 | mpi_set_ui( tmp, 1 ); |
159 | mpi_lshift_limbs( tmp, 2 * *k ); | 159 | mpi_lshift_limbs( tmp, 2 * *k ); |
160 | mpi_fdiv_q( tmp, tmp, m ); | 160 | mpi_fdiv_q( tmp, tmp, m ); |
161 | *r1 = mpi_alloc( 2* *k + 1 ); | 161 | *r1 = mpi_alloc( 2* *k + 1 ); |
162 | *r2 = mpi_alloc( 2* *k + 1 ); | 162 | *r2 = mpi_alloc( 2* *k + 1 ); |
163 | return tmp; | 163 | return tmp; |
164 | } | 164 | } |
165 | 165 | ||
166 | /**************** | 166 | /**************** |
167 | * Barrett reduction: We assume that these conditions are met: | 167 | * Barrett reduction: We assume that these conditions are met: |
168 | * Given x =(x_2k-1 ...x_0)_b | 168 | * Given x =(x_2k-1 ...x_0)_b |
169 | * m =(m_k-1 ....m_0)_b with m_k-1 != 0 | 169 | * m =(m_k-1 ....m_0)_b with m_k-1 != 0 |
170 | * Output r = x mod m | 170 | * Output r = x mod m |
171 | * Before using this function init_barret must be used to calucalte y and k. | 171 | * Before using this function init_barret must be used to calucalte y and k. |
172 | * Returns: false = no error | 172 | * Returns: false = no error |
173 | * true = can't perform barret reduction | 173 | * true = can't perform barret reduction |
174 | */ | 174 | */ |
175 | static int | 175 | static int |
176 | calc_barrett( gcry_mpi_t r, gcry_mpi_t x, gcry_mpi_t m, gcry_mpi_t y, int k, gcry_mpi_t r1, gcry_mpi_t r2 ) | 176 | calc_barrett( gcry_mpi_t r, gcry_mpi_t x, gcry_mpi_t m, gcry_mpi_t y, int k, gcry_mpi_t r1, gcry_mpi_t r2 ) |
177 | { | 177 | { |
178 | int xx = k > 3 ? k-3:0; | 178 | int xx = k > 3 ? k-3:0; |
179 | 179 | ||
180 | mpi_normalize( x ); | 180 | mpi_normalize( x ); |
181 | if( mpi_get_nlimbs(x) > 2*k ) | 181 | if( mpi_get_nlimbs(x) > 2*k ) |
182 | return 1; /* can't do it */ | 182 | return 1; /* can't do it */ |
183 | 183 | ||
184 | /* 1. q1 = floor( x / b^k-1) | 184 | /* 1. q1 = floor( x / b^k-1) |
185 | * q2 = q1 * y | 185 | * q2 = q1 * y |
186 | * q3 = floor( q2 / b^k+1 ) | 186 | * q3 = floor( q2 / b^k+1 ) |
187 | * Actually, we don't need qx, we can work direct on r2 | 187 | * Actually, we don't need qx, we can work direct on r2 |
188 | */ | 188 | */ |
189 | mpi_set( r2, x ); | 189 | mpi_set( r2, x ); |
190 | mpi_rshift_limbs( r2, k-1 ); | 190 | mpi_rshift_limbs( r2, k-1 ); |
191 | mpi_mul( r2, r2, y ); | 191 | mpi_mul( r2, r2, y ); |
192 | mpi_rshift_limbs( r2, k+1 ); | 192 | mpi_rshift_limbs( r2, k+1 ); |
193 | 193 | ||
194 | /* 2. r1 = x mod b^k+1 | 194 | /* 2. r1 = x mod b^k+1 |
195 | * r2 = q3 * m mod b^k+1 | 195 | * r2 = q3 * m mod b^k+1 |
196 | * r = r1 - r2 | 196 | * r = r1 - r2 |
197 | * 3. if r < 0 then r = r + b^k+1 | 197 | * 3. if r < 0 then r = r + b^k+1 |
198 | */ | 198 | */ |
199 | mpi_set( r1, x ); | 199 | mpi_set( r1, x ); |
200 | if( r1->nlimbs > k+1 ) /* quick modulo operation */ | 200 | if( r1->nlimbs > k+1 ) /* quick modulo operation */ |
201 | r1->nlimbs = k+1; | 201 | r1->nlimbs = k+1; |
202 | mpi_mul( r2, r2, m ); | 202 | mpi_mul( r2, r2, m ); |
203 | if( r2->nlimbs > k+1 ) /* quick modulo operation */ | 203 | if( r2->nlimbs > k+1 ) /* quick modulo operation */ |
204 | r2->nlimbs = k+1; | 204 | r2->nlimbs = k+1; |
205 | mpi_sub( r, r1, r2 ); | 205 | mpi_sub( r, r1, r2 ); |
206 | 206 | ||
207 | if( mpi_is_neg( r ) ) { | 207 | if( mpi_is_neg( r ) ) { |
208 | gcry_mpi_t tmp; | 208 | gcry_mpi_t tmp; |
209 | 209 | ||
210 | tmp = mpi_alloc( k + 2 ); | 210 | tmp = mpi_alloc( k + 2 ); |
211 | mpi_set_ui( tmp, 1 ); | 211 | mpi_set_ui( tmp, 1 ); |
212 | mpi_lshift_limbs( tmp, k+1 ); | 212 | mpi_lshift_limbs( tmp, k+1 ); |
213 | mpi_add( r, r, tmp ); | 213 | mpi_add( r, r, tmp ); |
214 | mpi_free(tmp); | 214 | mpi_free(tmp); |
215 | } | 215 | } |
216 | 216 | ||
217 | /* 4. while r >= m do r = r - m */ | 217 | /* 4. while r >= m do r = r - m */ |
218 | while( mpi_cmp( r, m ) >= 0 ) | 218 | while( mpi_cmp( r, m ) >= 0 ) |
219 | mpi_sub( r, r, m ); | 219 | mpi_sub( r, r, m ); |
220 | 220 | ||
221 | return 0; | 221 | return 0; |
222 | } | 222 | } |
223 | #endif /* USE_BARRETT */ | 223 | #endif /* USE_BARRETT */ |
224 | 224 | ||