diff options
Diffstat (limited to 'external_libs/python/pyzmq-14.7.0/bundled/libsodium/src/libsodium/crypto_sign/edwards25519sha512batch/ref/ge25519_edwards25519sha512batch.c')
-rw-r--r-- | external_libs/python/pyzmq-14.7.0/bundled/libsodium/src/libsodium/crypto_sign/edwards25519sha512batch/ref/ge25519_edwards25519sha512batch.c | 230 |
1 files changed, 0 insertions, 230 deletions
diff --git a/external_libs/python/pyzmq-14.7.0/bundled/libsodium/src/libsodium/crypto_sign/edwards25519sha512batch/ref/ge25519_edwards25519sha512batch.c b/external_libs/python/pyzmq-14.7.0/bundled/libsodium/src/libsodium/crypto_sign/edwards25519sha512batch/ref/ge25519_edwards25519sha512batch.c deleted file mode 100644 index 253b68f4..00000000 --- a/external_libs/python/pyzmq-14.7.0/bundled/libsodium/src/libsodium/crypto_sign/edwards25519sha512batch/ref/ge25519_edwards25519sha512batch.c +++ /dev/null @@ -1,230 +0,0 @@ -#include "fe25519.h" -#include "sc25519.h" -#include "ge25519.h" - -/* - * Arithmetic on the twisted Edwards curve -x^2 + y^2 = 1 + dx^2y^2 - * with d = -(121665/121666) = 37095705934669439343138083508754565189542113879843219016388785533085940283555 - * Base point: (15112221349535400772501151409588531511454012693041857206046113283949847762202,46316835694926478169428394003475163141307993866256225615783033603165251855960); - */ - -typedef struct -{ - fe25519 x; - fe25519 z; - fe25519 y; - fe25519 t; -} ge25519_p1p1; - -typedef struct -{ - fe25519 x; - fe25519 y; - fe25519 z; -} ge25519_p2; - -#define ge25519_p3 ge25519 - -/* Windowsize for fixed-window scalar multiplication */ -#define WINDOWSIZE 2 /* Should be 1,2, or 4 */ -#define WINDOWMASK ((1<<WINDOWSIZE)-1) - -/* packed parameter d in the Edwards curve equation */ -static const unsigned char ecd[32] = {0xA3, 0x78, 0x59, 0x13, 0xCA, 0x4D, 0xEB, 0x75, 0xAB, 0xD8, 0x41, 0x41, 0x4D, 0x0A, 0x70, 0x00, - 0x98, 0xE8, 0x79, 0x77, 0x79, 0x40, 0xC7, 0x8C, 0x73, 0xFE, 0x6F, 0x2B, 0xEE, 0x6C, 0x03, 0x52}; - -/* Packed coordinates of the base point */ -static const unsigned char ge25519_base_x[32] = {0x1A, 0xD5, 0x25, 0x8F, 0x60, 0x2D, 0x56, 0xC9, 0xB2, 0xA7, 0x25, 0x95, 0x60, 0xC7, 0x2C, 0x69, - 0x5C, 0xDC, 0xD6, 0xFD, 0x31, 0xE2, 0xA4, 0xC0, 0xFE, 0x53, 0x6E, 0xCD, 0xD3, 0x36, 0x69, 0x21}; -static const unsigned char ge25519_base_y[32] = {0x58, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, - 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66}; -static const unsigned char ge25519_base_z[32] = {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; -static const unsigned char ge25519_base_t[32] = {0xA3, 0xDD, 0xB7, 0xA5, 0xB3, 0x8A, 0xDE, 0x6D, 0xF5, 0x52, 0x51, 0x77, 0x80, 0x9F, 0xF0, 0x20, - 0x7D, 0xE3, 0xAB, 0x64, 0x8E, 0x4E, 0xEA, 0x66, 0x65, 0x76, 0x8B, 0xD7, 0x0F, 0x5F, 0x87, 0x67}; - -/* Packed coordinates of the neutral element */ -static const unsigned char ge25519_neutral_x[32] = {0}; -static const unsigned char ge25519_neutral_y[32] = {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; -static const unsigned char ge25519_neutral_z[32] = {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; -static const unsigned char ge25519_neutral_t[32] = {0}; - -static void p1p1_to_p2(ge25519_p2 *r, const ge25519_p1p1 *p) -{ - fe25519_mul(&r->x, &p->x, &p->t); - fe25519_mul(&r->y, &p->y, &p->z); - fe25519_mul(&r->z, &p->z, &p->t); -} - -static void p1p1_to_p3(ge25519_p3 *r, const ge25519_p1p1 *p) -{ - p1p1_to_p2((ge25519_p2 *)r, p); - fe25519_mul(&r->t, &p->x, &p->y); -} - -/* Constant-time version of: if(b) r = p */ -static void cmov_p3(ge25519_p3 *r, const ge25519_p3 *p, unsigned char b) -{ - fe25519_cmov(&r->x, &p->x, b); - fe25519_cmov(&r->y, &p->y, b); - fe25519_cmov(&r->z, &p->z, b); - fe25519_cmov(&r->t, &p->t, b); -} - -/* See http://www.hyperelliptic.org/EFD/g1p/auto-twisted-extended-1.html#doubling-dbl-2008-hwcd */ -static void dbl_p1p1(ge25519_p1p1 *r, const ge25519_p2 *p) -{ - fe25519 a,b,c,d; - fe25519_square(&a, &p->x); - fe25519_square(&b, &p->y); - fe25519_square(&c, &p->z); - fe25519_add(&c, &c, &c); - fe25519_neg(&d, &a); - - fe25519_add(&r->x, &p->x, &p->y); - fe25519_square(&r->x, &r->x); - fe25519_sub(&r->x, &r->x, &a); - fe25519_sub(&r->x, &r->x, &b); - fe25519_add(&r->z, &d, &b); - fe25519_sub(&r->t, &r->z, &c); - fe25519_sub(&r->y, &d, &b); -} - -static void add_p1p1(ge25519_p1p1 *r, const ge25519_p3 *p, const ge25519_p3 *q) -{ - fe25519 a, b, c, d, t, fd; - fe25519_unpack(&fd, ecd); - - fe25519_sub(&a, &p->y, &p->x); // A = (Y1-X1)*(Y2-X2) - fe25519_sub(&t, &q->y, &q->x); - fe25519_mul(&a, &a, &t); - fe25519_add(&b, &p->x, &p->y); // B = (Y1+X1)*(Y2+X2) - fe25519_add(&t, &q->x, &q->y); - fe25519_mul(&b, &b, &t); - fe25519_mul(&c, &p->t, &q->t); //C = T1*k*T2 - fe25519_mul(&c, &c, &fd); - fe25519_add(&c, &c, &c); //XXX: Can save this addition by precomputing 2*ecd - fe25519_mul(&d, &p->z, &q->z); //D = Z1*2*Z2 - fe25519_add(&d, &d, &d); - fe25519_sub(&r->x, &b, &a); // E = B-A - fe25519_sub(&r->t, &d, &c); // F = D-C - fe25519_add(&r->z, &d, &c); // G = D+C - fe25519_add(&r->y, &b, &a); // H = B+A -} - -/* ******************************************************************** - * EXPORTED FUNCTIONS - ******************************************************************** */ - -/* return 0 on success, -1 otherwise */ -int ge25519_unpack_vartime(ge25519_p3 *r, const unsigned char p[32]) -{ - int ret; - fe25519 t, fd; - unsigned char par; - - fe25519_setone(&r->z); - fe25519_unpack(&fd, ecd); - par = p[31] >> 7; - fe25519_unpack(&r->y, p); - fe25519_square(&r->x, &r->y); - fe25519_mul(&t, &r->x, &fd); - fe25519_sub(&r->x, &r->x, &r->z); - fe25519_add(&t, &r->z, &t); - fe25519_invert(&t, &t); - fe25519_mul(&r->x, &r->x, &t); - ret = fe25519_sqrt_vartime(&r->x, &r->x, par); - fe25519_mul(&r->t, &r->x, &r->y); - return ret; -} - -void ge25519_pack(unsigned char r[32], const ge25519_p3 *p) -{ - fe25519 tx, ty, zi; - fe25519_invert(&zi, &p->z); - fe25519_mul(&tx, &p->x, &zi); - fe25519_mul(&ty, &p->y, &zi); - fe25519_pack(r, &ty); - r[31] ^= fe25519_getparity(&tx) << 7; -} - -void ge25519_add(ge25519_p3 *r, const ge25519_p3 *p, const ge25519_p3 *q) -{ - ge25519_p1p1 grp1p1; - add_p1p1(&grp1p1, p, q); - p1p1_to_p3(r, &grp1p1); -} - -void ge25519_double(ge25519_p3 *r, const ge25519_p3 *p) -{ - ge25519_p1p1 grp1p1; - dbl_p1p1(&grp1p1, (const ge25519_p2 *)p); - p1p1_to_p3(r, &grp1p1); -} - -void ge25519_scalarmult(ge25519_p3 *r, const ge25519_p3 *p, const sc25519 *s) -{ - int i,j,k; - ge25519_p3 g; - ge25519_p3 pre[(1 << WINDOWSIZE)]; - ge25519_p3 t; - ge25519_p1p1 tp1p1; - unsigned char w; - unsigned char sb[32]; - - fe25519_unpack(&g.x, ge25519_neutral_x); - fe25519_unpack(&g.y, ge25519_neutral_y); - fe25519_unpack(&g.z, ge25519_neutral_z); - fe25519_unpack(&g.t, ge25519_neutral_t); - - sc25519_to32bytes(sb, s); - - // Precomputation - pre[0] = g; - pre[1] = *p; - for(i=2;i<(1<<WINDOWSIZE);i+=2) - { - dbl_p1p1(&tp1p1, (ge25519_p2 *)(pre+i/2)); - p1p1_to_p3(pre+i, &tp1p1); - add_p1p1(&tp1p1, pre+i, pre+1); - p1p1_to_p3(pre+i+1, &tp1p1); - } - - // Fixed-window scalar multiplication - for(i=32;i>0;i--) - { - for(j=8-WINDOWSIZE;j>=0;j-=WINDOWSIZE) - { - for(k=0;k<WINDOWSIZE-1;k++) - { - dbl_p1p1(&tp1p1, (ge25519_p2 *)&g); - p1p1_to_p2((ge25519_p2 *)&g, &tp1p1); - } - dbl_p1p1(&tp1p1, (ge25519_p2 *)&g); - p1p1_to_p3(&g, &tp1p1); - // Cache-timing resistant loading of precomputed value: - w = (sb[i-1]>>j) & WINDOWMASK; - t = pre[0]; - for(k=1;k<(1<<WINDOWSIZE);k++) - cmov_p3(&t, &pre[k], k==w); - - add_p1p1(&tp1p1, &g, &t); - if(j != 0) p1p1_to_p2((ge25519_p2 *)&g, &tp1p1); - else p1p1_to_p3(&g, &tp1p1); /* convert to p3 representation at the end */ - } - } - r->x = g.x; - r->y = g.y; - r->z = g.z; - r->t = g.t; -} - -void ge25519_scalarmult_base(ge25519_p3 *r, const sc25519 *s) -{ - /* XXX: Better algorithm for known-base-point scalar multiplication */ - ge25519_p3 t; - fe25519_unpack(&t.x, ge25519_base_x); - fe25519_unpack(&t.y, ge25519_base_y); - fe25519_unpack(&t.z, ge25519_base_z); - fe25519_unpack(&t.t, ge25519_base_t); - ge25519_scalarmult(r, &t, s); -} |