Mercurial > dropbear
annotate libtommath/bn_mp_toom_mul.c @ 1436:60fc6476e044
Update to libtommath v1.0
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Sat, 24 Jun 2017 22:37:14 +0800 |
| parents | 5ff8218bcee9 |
| children | 8bba51a55704 |
| rev | line source |
|---|---|
| 1436 | 1 #include <tommath_private.h> |
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2 #ifdef BN_MP_TOOM_MUL_C |
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis |
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4 * |
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5 * LibTomMath is a library that provides multiple-precision |
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6 * integer arithmetic as well as number theoretic functionality. |
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7 * |
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8 * The library was designed directly after the MPI library by |
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9 * Michael Fromberger but has been written from scratch with |
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10 * additional optimizations in place. |
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11 * |
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12 * The library is free for all purposes without any express |
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13 * guarantee it works. |
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14 * |
| 1436 | 15 * Tom St Denis, [email protected], http://libtom.org |
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16 */ |
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17 |
| 1436 | 18 /* multiplication using the Toom-Cook 3-way algorithm |
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19 * |
| 1436 | 20 * Much more complicated than Karatsuba but has a lower |
| 21 * asymptotic running time of O(N**1.464). This algorithm is | |
| 22 * only particularly useful on VERY large inputs | |
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23 * (we're talking 1000s of digits here...). |
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24 */ |
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25 int mp_toom_mul(mp_int *a, mp_int *b, mp_int *c) |
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26 { |
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27 mp_int w0, w1, w2, w3, w4, tmp1, tmp2, a0, a1, a2, b0, b1, b2; |
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28 int res, B; |
| 1436 | 29 |
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30 /* init temps */ |
| 1436 | 31 if ((res = mp_init_multi(&w0, &w1, &w2, &w3, &w4, |
| 32 &a0, &a1, &a2, &b0, &b1, | |
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33 &b2, &tmp1, &tmp2, NULL)) != MP_OKAY) { |
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34 return res; |
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35 } |
| 1436 | 36 |
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37 /* B */ |
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38 B = MIN(a->used, b->used) / 3; |
| 1436 | 39 |
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40 /* a = a2 * B**2 + a1 * B + a0 */ |
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41 if ((res = mp_mod_2d(a, DIGIT_BIT * B, &a0)) != MP_OKAY) { |
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42 goto ERR; |
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43 } |
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44 |
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45 if ((res = mp_copy(a, &a1)) != MP_OKAY) { |
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46 goto ERR; |
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47 } |
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48 mp_rshd(&a1, B); |
| 1436 | 49 if ((res = mp_mod_2d(&a1, DIGIT_BIT * B, &a1)) != MP_OKAY) { |
| 50 goto ERR; | |
| 51 } | |
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52 |
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53 if ((res = mp_copy(a, &a2)) != MP_OKAY) { |
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54 goto ERR; |
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55 } |
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56 mp_rshd(&a2, B*2); |
| 1436 | 57 |
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58 /* b = b2 * B**2 + b1 * B + b0 */ |
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59 if ((res = mp_mod_2d(b, DIGIT_BIT * B, &b0)) != MP_OKAY) { |
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60 goto ERR; |
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61 } |
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62 |
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63 if ((res = mp_copy(b, &b1)) != MP_OKAY) { |
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64 goto ERR; |
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65 } |
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66 mp_rshd(&b1, B); |
| 1436 | 67 (void)mp_mod_2d(&b1, DIGIT_BIT * B, &b1); |
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68 |
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69 if ((res = mp_copy(b, &b2)) != MP_OKAY) { |
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70 goto ERR; |
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71 } |
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72 mp_rshd(&b2, B*2); |
| 1436 | 73 |
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74 /* w0 = a0*b0 */ |
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75 if ((res = mp_mul(&a0, &b0, &w0)) != MP_OKAY) { |
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76 goto ERR; |
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77 } |
| 1436 | 78 |
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79 /* w4 = a2 * b2 */ |
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80 if ((res = mp_mul(&a2, &b2, &w4)) != MP_OKAY) { |
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81 goto ERR; |
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82 } |
| 1436 | 83 |
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84 /* w1 = (a2 + 2(a1 + 2a0))(b2 + 2(b1 + 2b0)) */ |
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85 if ((res = mp_mul_2(&a0, &tmp1)) != MP_OKAY) { |
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86 goto ERR; |
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87 } |
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88 if ((res = mp_add(&tmp1, &a1, &tmp1)) != MP_OKAY) { |
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89 goto ERR; |
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90 } |
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91 if ((res = mp_mul_2(&tmp1, &tmp1)) != MP_OKAY) { |
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92 goto ERR; |
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93 } |
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94 if ((res = mp_add(&tmp1, &a2, &tmp1)) != MP_OKAY) { |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
95 goto ERR; |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
96 } |
| 1436 | 97 |
|
284
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
98 if ((res = mp_mul_2(&b0, &tmp2)) != MP_OKAY) { |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
99 goto ERR; |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
100 } |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
101 if ((res = mp_add(&tmp2, &b1, &tmp2)) != MP_OKAY) { |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
102 goto ERR; |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
103 } |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
104 if ((res = mp_mul_2(&tmp2, &tmp2)) != MP_OKAY) { |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
105 goto ERR; |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
106 } |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
107 if ((res = mp_add(&tmp2, &b2, &tmp2)) != MP_OKAY) { |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
108 goto ERR; |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
109 } |
| 1436 | 110 |
|
284
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
111 if ((res = mp_mul(&tmp1, &tmp2, &w1)) != MP_OKAY) { |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
112 goto ERR; |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
113 } |
| 1436 | 114 |
|
284
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
115 /* w3 = (a0 + 2(a1 + 2a2))(b0 + 2(b1 + 2b2)) */ |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
116 if ((res = mp_mul_2(&a2, &tmp1)) != MP_OKAY) { |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
117 goto ERR; |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
118 } |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
119 if ((res = mp_add(&tmp1, &a1, &tmp1)) != MP_OKAY) { |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
120 goto ERR; |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
121 } |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
122 if ((res = mp_mul_2(&tmp1, &tmp1)) != MP_OKAY) { |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
123 goto ERR; |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
124 } |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
125 if ((res = mp_add(&tmp1, &a0, &tmp1)) != MP_OKAY) { |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
126 goto ERR; |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
127 } |
| 1436 | 128 |
|
284
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
129 if ((res = mp_mul_2(&b2, &tmp2)) != MP_OKAY) { |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
130 goto ERR; |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
131 } |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
132 if ((res = mp_add(&tmp2, &b1, &tmp2)) != MP_OKAY) { |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
133 goto ERR; |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
134 } |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
135 if ((res = mp_mul_2(&tmp2, &tmp2)) != MP_OKAY) { |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
136 goto ERR; |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
137 } |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
138 if ((res = mp_add(&tmp2, &b0, &tmp2)) != MP_OKAY) { |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
139 goto ERR; |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
140 } |
| 1436 | 141 |
|
284
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
142 if ((res = mp_mul(&tmp1, &tmp2, &w3)) != MP_OKAY) { |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
143 goto ERR; |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
144 } |
| 1436 | 145 |
|
284
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
146 |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
147 /* w2 = (a2 + a1 + a0)(b2 + b1 + b0) */ |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
148 if ((res = mp_add(&a2, &a1, &tmp1)) != MP_OKAY) { |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
149 goto ERR; |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
150 } |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
151 if ((res = mp_add(&tmp1, &a0, &tmp1)) != MP_OKAY) { |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
152 goto ERR; |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
153 } |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
154 if ((res = mp_add(&b2, &b1, &tmp2)) != MP_OKAY) { |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
155 goto ERR; |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
156 } |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
157 if ((res = mp_add(&tmp2, &b0, &tmp2)) != MP_OKAY) { |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
158 goto ERR; |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
159 } |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
160 if ((res = mp_mul(&tmp1, &tmp2, &w2)) != MP_OKAY) { |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
161 goto ERR; |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
162 } |
| 1436 | 163 |
| 164 /* now solve the matrix | |
| 165 | |
|
284
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
166 0 0 0 0 1 |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
167 1 2 4 8 16 |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
168 1 1 1 1 1 |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
169 16 8 4 2 1 |
|
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
170 1 0 0 0 0 |
| 1436 | 171 |
| 172 using 12 subtractions, 4 shifts, | |
| 173 2 small divisions and 1 small multiplication | |
|
284
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
174 */ |
| 1436 | 175 |
| 176 /* r1 - r4 */ | |
| 177 if ((res = mp_sub(&w1, &w4, &w1)) != MP_OKAY) { | |
| 178 goto ERR; | |
| 179 } | |
| 180 /* r3 - r0 */ | |
| 181 if ((res = mp_sub(&w3, &w0, &w3)) != MP_OKAY) { | |
| 182 goto ERR; | |
| 183 } | |
| 184 /* r1/2 */ | |
| 185 if ((res = mp_div_2(&w1, &w1)) != MP_OKAY) { | |
| 186 goto ERR; | |
| 187 } | |
| 188 /* r3/2 */ | |
| 189 if ((res = mp_div_2(&w3, &w3)) != MP_OKAY) { | |
| 190 goto ERR; | |
| 191 } | |
| 192 /* r2 - r0 - r4 */ | |
| 193 if ((res = mp_sub(&w2, &w0, &w2)) != MP_OKAY) { | |
| 194 goto ERR; | |
| 195 } | |
| 196 if ((res = mp_sub(&w2, &w4, &w2)) != MP_OKAY) { | |
| 197 goto ERR; | |
| 198 } | |
| 199 /* r1 - r2 */ | |
| 200 if ((res = mp_sub(&w1, &w2, &w1)) != MP_OKAY) { | |
| 201 goto ERR; | |
| 202 } | |
| 203 /* r3 - r2 */ | |
| 204 if ((res = mp_sub(&w3, &w2, &w3)) != MP_OKAY) { | |
| 205 goto ERR; | |
| 206 } | |
| 207 /* r1 - 8r0 */ | |
| 208 if ((res = mp_mul_2d(&w0, 3, &tmp1)) != MP_OKAY) { | |
| 209 goto ERR; | |
| 210 } | |
| 211 if ((res = mp_sub(&w1, &tmp1, &w1)) != MP_OKAY) { | |
| 212 goto ERR; | |
| 213 } | |
| 214 /* r3 - 8r4 */ | |
| 215 if ((res = mp_mul_2d(&w4, 3, &tmp1)) != MP_OKAY) { | |
| 216 goto ERR; | |
| 217 } | |
| 218 if ((res = mp_sub(&w3, &tmp1, &w3)) != MP_OKAY) { | |
| 219 goto ERR; | |
| 220 } | |
| 221 /* 3r2 - r1 - r3 */ | |
| 222 if ((res = mp_mul_d(&w2, 3, &w2)) != MP_OKAY) { | |
| 223 goto ERR; | |
| 224 } | |
| 225 if ((res = mp_sub(&w2, &w1, &w2)) != MP_OKAY) { | |
| 226 goto ERR; | |
| 227 } | |
| 228 if ((res = mp_sub(&w2, &w3, &w2)) != MP_OKAY) { | |
| 229 goto ERR; | |
| 230 } | |
| 231 /* r1 - r2 */ | |
| 232 if ((res = mp_sub(&w1, &w2, &w1)) != MP_OKAY) { | |
| 233 goto ERR; | |
| 234 } | |
| 235 /* r3 - r2 */ | |
| 236 if ((res = mp_sub(&w3, &w2, &w3)) != MP_OKAY) { | |
| 237 goto ERR; | |
| 238 } | |
| 239 /* r1/3 */ | |
| 240 if ((res = mp_div_3(&w1, &w1, NULL)) != MP_OKAY) { | |
| 241 goto ERR; | |
| 242 } | |
| 243 /* r3/3 */ | |
| 244 if ((res = mp_div_3(&w3, &w3, NULL)) != MP_OKAY) { | |
| 245 goto ERR; | |
| 246 } | |
| 247 | |
| 248 /* at this point shift W[n] by B*n */ | |
| 249 if ((res = mp_lshd(&w1, 1*B)) != MP_OKAY) { | |
| 250 goto ERR; | |
| 251 } | |
| 252 if ((res = mp_lshd(&w2, 2*B)) != MP_OKAY) { | |
| 253 goto ERR; | |
| 254 } | |
| 255 if ((res = mp_lshd(&w3, 3*B)) != MP_OKAY) { | |
| 256 goto ERR; | |
| 257 } | |
| 258 if ((res = mp_lshd(&w4, 4*B)) != MP_OKAY) { | |
| 259 goto ERR; | |
| 260 } | |
| 261 | |
| 262 if ((res = mp_add(&w0, &w1, c)) != MP_OKAY) { | |
| 263 goto ERR; | |
| 264 } | |
| 265 if ((res = mp_add(&w2, &w3, &tmp1)) != MP_OKAY) { | |
| 266 goto ERR; | |
| 267 } | |
| 268 if ((res = mp_add(&w4, &tmp1, &tmp1)) != MP_OKAY) { | |
| 269 goto ERR; | |
| 270 } | |
| 271 if ((res = mp_add(&tmp1, c, c)) != MP_OKAY) { | |
| 272 goto ERR; | |
| 273 } | |
| 274 | |
|
284
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
275 ERR: |
| 1436 | 276 mp_clear_multi(&w0, &w1, &w2, &w3, &w4, |
| 277 &a0, &a1, &a2, &b0, &b1, | |
| 278 &b2, &tmp1, &tmp2, NULL); | |
| 279 return res; | |
| 280 } | |
| 281 | |
|
284
eed26cff980b
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
282 #endif |
|
389
5ff8218bcee9
propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents:
284
diff
changeset
|
283 |
| 1436 | 284 /* $Source$ */ |
| 285 /* $Revision$ */ | |
| 286 /* $Date$ */ |