diff options
Diffstat (limited to 'moon-abe/pbc-0.5.14/arith/z.c')
-rw-r--r-- | moon-abe/pbc-0.5.14/arith/z.c | 263 |
1 files changed, 0 insertions, 263 deletions
diff --git a/moon-abe/pbc-0.5.14/arith/z.c b/moon-abe/pbc-0.5.14/arith/z.c deleted file mode 100644 index ff5a4a97..00000000 --- a/moon-abe/pbc-0.5.14/arith/z.c +++ /dev/null @@ -1,263 +0,0 @@ -// The ring Z. -// -// Wrappers around GMP mpz functions. -#include <stdarg.h> -#include <stdio.h> -#include <stdint.h> // for intptr_t -#include <stdlib.h> -#include <gmp.h> -#include "pbc_utils.h" -#include "pbc_field.h" -#include "pbc_z.h" -#include "pbc_random.h" -#include "pbc_fp.h" -#include "pbc_memory.h" - -static void z_init(element_ptr e) { - e->data = pbc_malloc(sizeof(mpz_t)); - mpz_init(e->data); -} - -static void z_clear(element_ptr e) { - mpz_clear(e->data); - pbc_free(e->data); -} - -static void z_set_si(element_ptr e, signed long int op) { - mpz_set_si(e->data, op); -} - -static void z_set_mpz(element_ptr e, mpz_ptr z) { - mpz_set(e->data, z); -} - -static void z_set0(element_ptr e) { - mpz_set_ui(e->data, 0); -} - -static void z_set1(element_ptr e) { - mpz_set_ui(e->data, 1); -} - -static size_t z_out_str(FILE *stream, int base, element_ptr e) { - return mpz_out_str(stream, base, e->data); -} - -static int z_sgn(element_ptr a) { - mpz_ptr z = a->data; - return mpz_sgn(z); -} - -static void z_add(element_ptr n, element_ptr a, element_ptr b) { - mpz_add(n->data, a->data, b->data); -} - -static void z_sub(element_ptr n, element_ptr a, element_ptr b) { - mpz_sub(n->data, a->data, b->data); -} - -static void z_square(element_ptr c, element_ptr a) { - mpz_mul(c->data, a->data, a->data); -} - -static void z_double(element_ptr n, element_ptr a) { - mpz_mul_2exp(n->data, a->data, 1); -} - -static void z_halve(element_ptr n, element_ptr a) { - mpz_tdiv_q_2exp(n->data, a->data, -1); -} - -static void z_mul(element_ptr n, element_ptr a, element_ptr b) { - mpz_mul(n->data, a->data, b->data); -} - -static void z_mul_mpz(element_ptr n, element_ptr a, mpz_ptr z) { - mpz_mul(n->data, a->data, z); -} - -static void z_mul_si(element_ptr n, element_ptr a, signed long int z) { - mpz_mul_si(n->data, a->data, z); -} - -static void z_pow_mpz(element_ptr n, element_ptr a, mpz_ptr z) { - mpz_pow_ui(n->data, a->data, mpz_get_ui(z)); -} - -static void z_set(element_ptr n, element_ptr a) { - mpz_set(n->data, a->data); -} - -static void z_neg(element_ptr n, element_ptr a) { - mpz_neg(n->data, a->data); -} - -static void z_invert(element_ptr n, element_ptr a) { - if (!mpz_cmpabs_ui(a->data, 1)) { - mpz_set(n->data, a->data); - } else mpz_set_ui(n->data, 0); -} - -static void z_div(element_ptr c, element_ptr a, element_ptr b) { - mpz_tdiv_q(c->data, a->data, b->data); -} - -//(doesn't make sense if order is infinite) -static void z_random(element_ptr n) { - mpz_set_ui(n->data, 0); -} - -static void z_from_hash(element_ptr n, void *data, int len) { - mpz_import(n->data, len, -1, 1, -1, 0, data); -} - -static int z_is1(element_ptr n) { - return !mpz_cmp_ui((mpz_ptr) n->data, 1); -} - -static int z_is0(element_ptr n) { - return mpz_is0(n->data); -} - -static int z_cmp(element_ptr a, element_ptr b) { - return mpz_cmp((mpz_ptr) a->data, (mpz_ptr) b->data); -} - -static int z_is_sqr(element_ptr a) { - return mpz_perfect_power_p(a->data); -} - -static void z_sqrt(element_ptr c, element_ptr a) { - mpz_sqrt(c->data, a->data); -} - -static void z_field_clear(field_t f) { - UNUSED_VAR (f); -} - -// OpenSSL convention: -// 4 bytes containing length -// followed by number in big-endian, most-significant bit set if negative -// (prepending null byte if necessary) -// Positive numbers also the same as mpz_out_raw. -static int z_to_bytes(unsigned char *data, element_t e) { - mpz_ptr z = e->data; - size_t msb = mpz_sizeinbase(z, 2); - size_t n = 4; - size_t i; - - if (!(msb % 8)) { - data[4] = 0; - n++; - } - if (mpz_sgn(z) < 0) { - mpz_export(data + n, NULL, 1, 1, 1, 0, z); - data[4] |= 128; - } else { - mpz_export(data + n, NULL, 1, 1, 1, 0, z); - } - n += (msb + 7) / 8 - 4; - for (i=0; i<4; i++) { - data[i] = (n >> 8 * (3 - i)); - } - n += 4; - - return n; -} - -static int z_from_bytes(element_t e, unsigned char *data) { - unsigned char *ptr; - size_t i, n; - mpz_ptr z = e->data; - mpz_t z1; - int neg = 0; - - mpz_init(z1); - mpz_set_ui(z, 0); - - ptr = data; - n = 0; - for (i=0; i<4; i++) { - n += ((unsigned int) *ptr) << 8 * (3 - i); - ptr++; - } - if (data[4] & 128) { - neg = 1; - data[4] &= 127; - } - for (i=0; i<n; i++) { - mpz_set_ui(z1, *ptr); - mpz_mul_2exp(z1, z1, 8 * (n - 1 - i)); - ptr++; - mpz_add(z, z, z1); - } - mpz_clear(z1); - if (neg) mpz_neg(z, z); - return n; -} - -static void z_to_mpz(mpz_ptr z, element_ptr a) { - mpz_set(z, a->data); -} - -static int z_length_in_bytes(element_ptr a) { - return (mpz_sizeinbase(a->data, 2) + 7) / 8 + 4; -} - -static void z_out_info(FILE *out, field_ptr f) { - UNUSED_VAR(f); - fprintf(out, "Z: wrapped GMP"); -} - -static int z_set_str(element_ptr e, const char *s, int base) { - mpz_t z; - mpz_init(z); - int result = pbc_mpz_set_str(z, s, base); - z_set_mpz(e, z); - mpz_clear(z); - return result; -} - -void field_init_z(field_ptr f) { - field_init(f); - f->init = z_init; - f->clear = z_clear; - f->set_si = z_set_si; - f->set_mpz = z_set_mpz; - f->set_str = z_set_str; - f->out_str = z_out_str; - f->sign = z_sgn; - f->add = z_add; - f->sub = z_sub; - f->set = z_set; - f->square = z_square; - f->doub = z_double; - f->halve = z_halve; - f->mul = z_mul; - f->mul_mpz = z_mul_mpz; - f->mul_si = z_mul_si; - f->pow_mpz = z_pow_mpz; - f->neg = z_neg; - f->cmp = z_cmp; - f->invert = z_invert; - f->div = z_div; - f->random = z_random; - f->from_hash = z_from_hash; - f->is1 = z_is1; - f->is0 = z_is0; - f->set0 = z_set0; - f->set1 = z_set1; - f->is_sqr = z_is_sqr; - f->sqrt = z_sqrt; - f->field_clear = z_field_clear; - f->to_bytes = z_to_bytes; - f->from_bytes = z_from_bytes; - f->to_mpz = z_to_mpz; - f->length_in_bytes = z_length_in_bytes; - - f->out_info = z_out_info; - - mpz_set_ui(f->order, 0); - f->data = NULL; - f->fixed_length_in_bytes = -1; -} |