Mercurial > trustbridge > nss-cmake-static
annotate nss/lib/freebl/ecl/ecp_256.c @ 1:247cffdc9b89
Add a pesodo config file for inlcude directories and library names
author | Andre Heinecke <andre.heinecke@intevation.de> |
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date | Mon, 28 Jul 2014 13:00:06 +0200 |
parents | 1e5118fa0cb1 |
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rev | line source |
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0
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1 /* This Source Code Form is subject to the terms of the Mozilla Public |
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2 * License, v. 2.0. If a copy of the MPL was not distributed with this |
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3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
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4 |
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5 #include "ecp.h" |
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6 #include "mpi.h" |
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7 #include "mplogic.h" |
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8 #include "mpi-priv.h" |
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9 |
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10 /* Fast modular reduction for p256 = 2^256 - 2^224 + 2^192+ 2^96 - 1. a can be r. |
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11 * Uses algorithm 2.29 from Hankerson, Menezes, Vanstone. Guide to |
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12 * Elliptic Curve Cryptography. */ |
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13 static mp_err |
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14 ec_GFp_nistp256_mod(const mp_int *a, mp_int *r, const GFMethod *meth) |
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15 { |
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16 mp_err res = MP_OKAY; |
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17 mp_size a_used = MP_USED(a); |
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18 int a_bits = mpl_significant_bits(a); |
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19 mp_digit carry; |
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20 |
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21 #ifdef ECL_THIRTY_TWO_BIT |
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22 mp_digit a8=0, a9=0, a10=0, a11=0, a12=0, a13=0, a14=0, a15=0; |
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23 mp_digit r0, r1, r2, r3, r4, r5, r6, r7; |
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24 int r8; /* must be a signed value ! */ |
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25 #else |
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26 mp_digit a4=0, a5=0, a6=0, a7=0; |
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27 mp_digit a4h, a4l, a5h, a5l, a6h, a6l, a7h, a7l; |
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28 mp_digit r0, r1, r2, r3; |
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29 int r4; /* must be a signed value ! */ |
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30 #endif |
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31 /* for polynomials larger than twice the field size |
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32 * use regular reduction */ |
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33 if (a_bits < 256) { |
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34 if (a == r) return MP_OKAY; |
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35 return mp_copy(a,r); |
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36 } |
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37 if (a_bits > 512) { |
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38 MP_CHECKOK(mp_mod(a, &meth->irr, r)); |
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39 } else { |
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40 |
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41 #ifdef ECL_THIRTY_TWO_BIT |
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42 switch (a_used) { |
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43 case 16: |
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44 a15 = MP_DIGIT(a,15); |
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45 case 15: |
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46 a14 = MP_DIGIT(a,14); |
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47 case 14: |
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48 a13 = MP_DIGIT(a,13); |
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49 case 13: |
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50 a12 = MP_DIGIT(a,12); |
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51 case 12: |
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52 a11 = MP_DIGIT(a,11); |
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53 case 11: |
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54 a10 = MP_DIGIT(a,10); |
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55 case 10: |
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56 a9 = MP_DIGIT(a,9); |
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57 case 9: |
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58 a8 = MP_DIGIT(a,8); |
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59 } |
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60 |
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61 r0 = MP_DIGIT(a,0); |
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62 r1 = MP_DIGIT(a,1); |
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63 r2 = MP_DIGIT(a,2); |
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64 r3 = MP_DIGIT(a,3); |
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65 r4 = MP_DIGIT(a,4); |
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66 r5 = MP_DIGIT(a,5); |
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67 r6 = MP_DIGIT(a,6); |
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68 r7 = MP_DIGIT(a,7); |
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69 |
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70 /* sum 1 */ |
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71 MP_ADD_CARRY(r3, a11, r3, 0, carry); |
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72 MP_ADD_CARRY(r4, a12, r4, carry, carry); |
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73 MP_ADD_CARRY(r5, a13, r5, carry, carry); |
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74 MP_ADD_CARRY(r6, a14, r6, carry, carry); |
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75 MP_ADD_CARRY(r7, a15, r7, carry, carry); |
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76 r8 = carry; |
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77 MP_ADD_CARRY(r3, a11, r3, 0, carry); |
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78 MP_ADD_CARRY(r4, a12, r4, carry, carry); |
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79 MP_ADD_CARRY(r5, a13, r5, carry, carry); |
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80 MP_ADD_CARRY(r6, a14, r6, carry, carry); |
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81 MP_ADD_CARRY(r7, a15, r7, carry, carry); |
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82 r8 += carry; |
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83 /* sum 2 */ |
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84 MP_ADD_CARRY(r3, a12, r3, 0, carry); |
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85 MP_ADD_CARRY(r4, a13, r4, carry, carry); |
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86 MP_ADD_CARRY(r5, a14, r5, carry, carry); |
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87 MP_ADD_CARRY(r6, a15, r6, carry, carry); |
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88 MP_ADD_CARRY(r7, 0, r7, carry, carry); |
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89 r8 += carry; |
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90 /* combine last bottom of sum 3 with second sum 2 */ |
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91 MP_ADD_CARRY(r0, a8, r0, 0, carry); |
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92 MP_ADD_CARRY(r1, a9, r1, carry, carry); |
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93 MP_ADD_CARRY(r2, a10, r2, carry, carry); |
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94 MP_ADD_CARRY(r3, a12, r3, carry, carry); |
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95 MP_ADD_CARRY(r4, a13, r4, carry, carry); |
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96 MP_ADD_CARRY(r5, a14, r5, carry, carry); |
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97 MP_ADD_CARRY(r6, a15, r6, carry, carry); |
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98 MP_ADD_CARRY(r7, a15, r7, carry, carry); /* from sum 3 */ |
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99 r8 += carry; |
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100 /* sum 3 (rest of it)*/ |
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101 MP_ADD_CARRY(r6, a14, r6, 0, carry); |
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102 MP_ADD_CARRY(r7, 0, r7, carry, carry); |
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103 r8 += carry; |
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104 /* sum 4 (rest of it)*/ |
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105 MP_ADD_CARRY(r0, a9, r0, 0, carry); |
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106 MP_ADD_CARRY(r1, a10, r1, carry, carry); |
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107 MP_ADD_CARRY(r2, a11, r2, carry, carry); |
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108 MP_ADD_CARRY(r3, a13, r3, carry, carry); |
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109 MP_ADD_CARRY(r4, a14, r4, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
110 MP_ADD_CARRY(r5, a15, r5, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
111 MP_ADD_CARRY(r6, a13, r6, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
112 MP_ADD_CARRY(r7, a8, r7, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
113 r8 += carry; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
114 /* diff 5 */ |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
115 MP_SUB_BORROW(r0, a11, r0, 0, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
116 MP_SUB_BORROW(r1, a12, r1, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
117 MP_SUB_BORROW(r2, a13, r2, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
118 MP_SUB_BORROW(r3, 0, r3, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
119 MP_SUB_BORROW(r4, 0, r4, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
120 MP_SUB_BORROW(r5, 0, r5, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
121 MP_SUB_BORROW(r6, a8, r6, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
122 MP_SUB_BORROW(r7, a10, r7, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
123 r8 -= carry; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
124 /* diff 6 */ |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
125 MP_SUB_BORROW(r0, a12, r0, 0, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
126 MP_SUB_BORROW(r1, a13, r1, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
127 MP_SUB_BORROW(r2, a14, r2, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
128 MP_SUB_BORROW(r3, a15, r3, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
129 MP_SUB_BORROW(r4, 0, r4, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
130 MP_SUB_BORROW(r5, 0, r5, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
131 MP_SUB_BORROW(r6, a9, r6, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
132 MP_SUB_BORROW(r7, a11, r7, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
133 r8 -= carry; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
134 /* diff 7 */ |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
135 MP_SUB_BORROW(r0, a13, r0, 0, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
136 MP_SUB_BORROW(r1, a14, r1, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
137 MP_SUB_BORROW(r2, a15, r2, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
138 MP_SUB_BORROW(r3, a8, r3, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
139 MP_SUB_BORROW(r4, a9, r4, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
140 MP_SUB_BORROW(r5, a10, r5, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
141 MP_SUB_BORROW(r6, 0, r6, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
142 MP_SUB_BORROW(r7, a12, r7, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
143 r8 -= carry; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
144 /* diff 8 */ |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
145 MP_SUB_BORROW(r0, a14, r0, 0, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
146 MP_SUB_BORROW(r1, a15, r1, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
147 MP_SUB_BORROW(r2, 0, r2, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
148 MP_SUB_BORROW(r3, a9, r3, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
149 MP_SUB_BORROW(r4, a10, r4, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
150 MP_SUB_BORROW(r5, a11, r5, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
151 MP_SUB_BORROW(r6, 0, r6, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
152 MP_SUB_BORROW(r7, a13, r7, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
153 r8 -= carry; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
154 |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
155 /* reduce the overflows */ |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
156 while (r8 > 0) { |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
157 mp_digit r8_d = r8; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
158 MP_ADD_CARRY(r0, r8_d, r0, 0, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
159 MP_ADD_CARRY(r1, 0, r1, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
160 MP_ADD_CARRY(r2, 0, r2, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
161 MP_ADD_CARRY(r3, 0-r8_d, r3, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
162 MP_ADD_CARRY(r4, MP_DIGIT_MAX, r4, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
163 MP_ADD_CARRY(r5, MP_DIGIT_MAX, r5, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
164 MP_ADD_CARRY(r6, 0-(r8_d+1), r6, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
165 MP_ADD_CARRY(r7, (r8_d-1), r7, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
166 r8 = carry; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
167 } |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
168 |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
169 /* reduce the underflows */ |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
170 while (r8 < 0) { |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
171 mp_digit r8_d = -r8; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
172 MP_SUB_BORROW(r0, r8_d, r0, 0, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
173 MP_SUB_BORROW(r1, 0, r1, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
174 MP_SUB_BORROW(r2, 0, r2, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
175 MP_SUB_BORROW(r3, 0-r8_d, r3, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
176 MP_SUB_BORROW(r4, MP_DIGIT_MAX, r4, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
177 MP_SUB_BORROW(r5, MP_DIGIT_MAX, r5, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
178 MP_SUB_BORROW(r6, 0-(r8_d+1), r6, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
179 MP_SUB_BORROW(r7, (r8_d-1), r7, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
180 r8 = 0-carry; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
181 } |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
182 if (a != r) { |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
183 MP_CHECKOK(s_mp_pad(r,8)); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
184 } |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
185 MP_SIGN(r) = MP_ZPOS; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
186 MP_USED(r) = 8; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
187 |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
188 MP_DIGIT(r,7) = r7; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
189 MP_DIGIT(r,6) = r6; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
190 MP_DIGIT(r,5) = r5; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
191 MP_DIGIT(r,4) = r4; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
192 MP_DIGIT(r,3) = r3; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
193 MP_DIGIT(r,2) = r2; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
194 MP_DIGIT(r,1) = r1; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
195 MP_DIGIT(r,0) = r0; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
196 |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
197 /* final reduction if necessary */ |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
198 if ((r7 == MP_DIGIT_MAX) && |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
199 ((r6 > 1) || ((r6 == 1) && |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
200 (r5 || r4 || r3 || |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
201 ((r2 == MP_DIGIT_MAX) && (r1 == MP_DIGIT_MAX) |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
202 && (r0 == MP_DIGIT_MAX)))))) { |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
203 MP_CHECKOK(mp_sub(r, &meth->irr, r)); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
204 } |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
205 |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
206 s_mp_clamp(r); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
207 #else |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
208 switch (a_used) { |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
209 case 8: |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
210 a7 = MP_DIGIT(a,7); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
211 case 7: |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
212 a6 = MP_DIGIT(a,6); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
213 case 6: |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
214 a5 = MP_DIGIT(a,5); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
215 case 5: |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
216 a4 = MP_DIGIT(a,4); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
217 } |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
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|
218 a7l = a7 << 32; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
219 a7h = a7 >> 32; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
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220 a6l = a6 << 32; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
221 a6h = a6 >> 32; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
222 a5l = a5 << 32; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
223 a5h = a5 >> 32; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
224 a4l = a4 << 32; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
225 a4h = a4 >> 32; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
226 r3 = MP_DIGIT(a,3); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
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changeset
|
227 r2 = MP_DIGIT(a,2); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
228 r1 = MP_DIGIT(a,1); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
229 r0 = MP_DIGIT(a,0); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
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|
230 |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
231 /* sum 1 */ |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
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changeset
|
232 MP_ADD_CARRY(r1, a5h << 32, r1, 0, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
233 MP_ADD_CARRY(r2, a6, r2, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
234 MP_ADD_CARRY(r3, a7, r3, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
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235 r4 = carry; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
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changeset
|
236 MP_ADD_CARRY(r1, a5h << 32, r1, 0, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
237 MP_ADD_CARRY(r2, a6, r2, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
238 MP_ADD_CARRY(r3, a7, r3, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
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239 r4 += carry; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
240 /* sum 2 */ |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
241 MP_ADD_CARRY(r1, a6l, r1, 0, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
242 MP_ADD_CARRY(r2, a6h | a7l, r2, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
243 MP_ADD_CARRY(r3, a7h, r3, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
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244 r4 += carry; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
245 MP_ADD_CARRY(r1, a6l, r1, 0, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
246 MP_ADD_CARRY(r2, a6h | a7l, r2, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
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247 MP_ADD_CARRY(r3, a7h, r3, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
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248 r4 += carry; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
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249 |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
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250 /* sum 3 */ |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
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changeset
|
251 MP_ADD_CARRY(r0, a4, r0, 0, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
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252 MP_ADD_CARRY(r1, a5l >> 32, r1, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
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253 MP_ADD_CARRY(r2, 0, r2, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
254 MP_ADD_CARRY(r3, a7, r3, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
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255 r4 += carry; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
256 /* sum 4 */ |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
257 MP_ADD_CARRY(r0, a4h | a5l, r0, 0, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
258 MP_ADD_CARRY(r1, a5h|(a6h<<32), r1, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
259 MP_ADD_CARRY(r2, a7, r2, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
260 MP_ADD_CARRY(r3, a6h | a4l, r3, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
261 r4 += carry; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
262 /* diff 5 */ |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
263 MP_SUB_BORROW(r0, a5h | a6l, r0, 0, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
264 MP_SUB_BORROW(r1, a6h, r1, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
265 MP_SUB_BORROW(r2, 0, r2, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
266 MP_SUB_BORROW(r3, (a4l>>32)|a5l,r3, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
267 r4 -= carry; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
268 /* diff 6 */ |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
269 MP_SUB_BORROW(r0, a6, r0, 0, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
270 MP_SUB_BORROW(r1, a7, r1, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
271 MP_SUB_BORROW(r2, 0, r2, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
272 MP_SUB_BORROW(r3, a4h|(a5h<<32),r3, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
273 r4 -= carry; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
274 /* diff 7 */ |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
275 MP_SUB_BORROW(r0, a6h|a7l, r0, 0, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
276 MP_SUB_BORROW(r1, a7h|a4l, r1, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
277 MP_SUB_BORROW(r2, a4h|a5l, r2, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
278 MP_SUB_BORROW(r3, a6l, r3, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
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|
279 r4 -= carry; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
280 /* diff 8 */ |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
281 MP_SUB_BORROW(r0, a7, r0, 0, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
282 MP_SUB_BORROW(r1, a4h<<32, r1, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
283 MP_SUB_BORROW(r2, a5, r2, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
284 MP_SUB_BORROW(r3, a6h<<32, r3, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
285 r4 -= carry; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
286 |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
287 /* reduce the overflows */ |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
288 while (r4 > 0) { |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
289 mp_digit r4_long = r4; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
290 mp_digit r4l = (r4_long << 32); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
291 MP_ADD_CARRY(r0, r4_long, r0, 0, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
292 MP_ADD_CARRY(r1, 0-r4l, r1, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
293 MP_ADD_CARRY(r2, MP_DIGIT_MAX, r2, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
294 MP_ADD_CARRY(r3, r4l-r4_long-1,r3, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
295 r4 = carry; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
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|
296 } |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
297 |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
298 /* reduce the underflows */ |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
299 while (r4 < 0) { |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
300 mp_digit r4_long = -r4; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
301 mp_digit r4l = (r4_long << 32); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
302 MP_SUB_BORROW(r0, r4_long, r0, 0, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
303 MP_SUB_BORROW(r1, 0-r4l, r1, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
304 MP_SUB_BORROW(r2, MP_DIGIT_MAX, r2, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
305 MP_SUB_BORROW(r3, r4l-r4_long-1,r3, carry, carry); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
306 r4 = 0-carry; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
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|
307 } |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
308 |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
309 if (a != r) { |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
310 MP_CHECKOK(s_mp_pad(r,4)); |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
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|
311 } |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
312 MP_SIGN(r) = MP_ZPOS; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
313 MP_USED(r) = 4; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
314 |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
315 MP_DIGIT(r,3) = r3; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
316 MP_DIGIT(r,2) = r2; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
317 MP_DIGIT(r,1) = r1; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
318 MP_DIGIT(r,0) = r0; |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
319 |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
320 /* final reduction if necessary */ |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
321 if ((r3 > 0xFFFFFFFF00000001ULL) || |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
322 ((r3 == 0xFFFFFFFF00000001ULL) && |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
323 (r2 || (r1 >> 32)|| |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
324 (r1 == 0xFFFFFFFFULL && r0 == MP_DIGIT_MAX)))) { |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
325 /* very rare, just use mp_sub */ |
1e5118fa0cb1
This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff
changeset
|
326 MP_CHECKOK(mp_sub(r, &meth->irr, r)); |
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327 } |
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328 |
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329 s_mp_clamp(r); |
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330 #endif |
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331 } |
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332 |
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333 CLEANUP: |
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334 return res; |
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335 } |
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336 |
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337 /* Compute the square of polynomial a, reduce modulo p256. Store the |
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338 * result in r. r could be a. Uses optimized modular reduction for p256. |
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339 */ |
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340 static mp_err |
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341 ec_GFp_nistp256_sqr(const mp_int *a, mp_int *r, const GFMethod *meth) |
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342 { |
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343 mp_err res = MP_OKAY; |
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344 |
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345 MP_CHECKOK(mp_sqr(a, r)); |
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346 MP_CHECKOK(ec_GFp_nistp256_mod(r, r, meth)); |
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347 CLEANUP: |
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348 return res; |
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349 } |
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350 |
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351 /* Compute the product of two polynomials a and b, reduce modulo p256. |
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352 * Store the result in r. r could be a or b; a could be b. Uses |
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353 * optimized modular reduction for p256. */ |
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354 static mp_err |
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355 ec_GFp_nistp256_mul(const mp_int *a, const mp_int *b, mp_int *r, |
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356 const GFMethod *meth) |
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357 { |
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358 mp_err res = MP_OKAY; |
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359 |
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360 MP_CHECKOK(mp_mul(a, b, r)); |
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361 MP_CHECKOK(ec_GFp_nistp256_mod(r, r, meth)); |
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362 CLEANUP: |
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363 return res; |
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364 } |
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365 |
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366 /* Wire in fast field arithmetic and precomputation of base point for |
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367 * named curves. */ |
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368 mp_err |
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369 ec_group_set_gfp256(ECGroup *group, ECCurveName name) |
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370 { |
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371 if (name == ECCurve_NIST_P256) { |
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372 group->meth->field_mod = &ec_GFp_nistp256_mod; |
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373 group->meth->field_mul = &ec_GFp_nistp256_mul; |
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374 group->meth->field_sqr = &ec_GFp_nistp256_sqr; |
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375 } |
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376 return MP_OKAY; |
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377 } |