diff options
Diffstat (limited to 'external_libs/python/pyzmq-14.7.0/bundled/libsodium/src/libsodium/crypto_sign/edwards25519sha512batch/ref/fe25519_edwards25519sha512batch.c')
-rw-r--r-- | external_libs/python/pyzmq-14.7.0/bundled/libsodium/src/libsodium/crypto_sign/edwards25519sha512batch/ref/fe25519_edwards25519sha512batch.c | 348 |
1 files changed, 0 insertions, 348 deletions
diff --git a/external_libs/python/pyzmq-14.7.0/bundled/libsodium/src/libsodium/crypto_sign/edwards25519sha512batch/ref/fe25519_edwards25519sha512batch.c b/external_libs/python/pyzmq-14.7.0/bundled/libsodium/src/libsodium/crypto_sign/edwards25519sha512batch/ref/fe25519_edwards25519sha512batch.c deleted file mode 100644 index df7a923e..00000000 --- a/external_libs/python/pyzmq-14.7.0/bundled/libsodium/src/libsodium/crypto_sign/edwards25519sha512batch/ref/fe25519_edwards25519sha512batch.c +++ /dev/null @@ -1,348 +0,0 @@ -#include "fe25519.h" - -#define WINDOWSIZE 4 /* Should be 1,2, or 4 */ -#define WINDOWMASK ((1<<WINDOWSIZE)-1) - -static void reduce_add_sub(fe25519 *r) -{ - crypto_uint32 t; - int i,rep; - - for(rep=0;rep<4;rep++) - { - t = r->v[31] >> 7; - r->v[31] &= 127; - t *= 19; - r->v[0] += t; - for(i=0;i<31;i++) - { - t = r->v[i] >> 8; - r->v[i+1] += t; - r->v[i] &= 255; - } - } -} - -static void reduce_mul(fe25519 *r) -{ - crypto_uint32 t; - int i,rep; - - for(rep=0;rep<2;rep++) - { - t = r->v[31] >> 7; - r->v[31] &= 127; - t *= 19; - r->v[0] += t; - for(i=0;i<31;i++) - { - t = r->v[i] >> 8; - r->v[i+1] += t; - r->v[i] &= 255; - } - } -} - -/* reduction modulo 2^255-19 */ -static void freeze(fe25519 *r) -{ - int i; - unsigned int m = (r->v[31] == 127); - for(i=30;i>1;i--) - m *= (r->v[i] == 255); - m *= (r->v[0] >= 237); - - r->v[31] -= m*127; - for(i=30;i>0;i--) - r->v[i] -= m*255; - r->v[0] -= m*237; -} - -/*freeze input before calling isone*/ -static int isone(const fe25519 *x) -{ - int i; - int r = (x->v[0] == 1); - for(i=1;i<32;i++) - r *= (x->v[i] == 0); - return r; -} - -/*freeze input before calling iszero*/ -static int iszero(const fe25519 *x) -{ - int i; - int r = (x->v[0] == 0); - for(i=1;i<32;i++) - r *= (x->v[i] == 0); - return r; -} - - -static int issquare(const fe25519 *x) -{ - unsigned char e[32] = {0xf6,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x3f}; /* (p-1)/2 */ - fe25519 t; - - fe25519_pow(&t,x,e); - freeze(&t); - return isone(&t) || iszero(&t); -} - -void fe25519_unpack(fe25519 *r, const unsigned char x[32]) -{ - int i; - for(i=0;i<32;i++) r->v[i] = x[i]; - r->v[31] &= 127; -} - -/* Assumes input x being reduced mod 2^255 */ -void fe25519_pack(unsigned char r[32], const fe25519 *x) -{ - int i; - unsigned int m; - for(i=0;i<32;i++) - r[i] = x->v[i]; - - /* freeze byte array */ - m = (r[31] == 127); /* XXX: some compilers might use branches; fix */ - for(i=30;i>1;i--) - m *= (r[i] == 255); - m *= (r[0] >= 237); - r[31] -= m*127; - for(i=30;i>0;i--) - r[i] -= m*255; - r[0] -= m*237; -} - -void fe25519_cmov(fe25519 *r, const fe25519 *x, unsigned char b) -{ - unsigned char nb = 1-b; - int i; - for(i=0;i<32;i++) r->v[i] = nb * r->v[i] + b * x->v[i]; -} - -unsigned char fe25519_getparity(const fe25519 *x) -{ - fe25519 t; - int i; - for(i=0;i<32;i++) t.v[i] = x->v[i]; - freeze(&t); - return t.v[0] & 1; -} - -void fe25519_setone(fe25519 *r) -{ - int i; - r->v[0] = 1; - for(i=1;i<32;i++) r->v[i]=0; -} - -void fe25519_setzero(fe25519 *r) -{ - int i; - for(i=0;i<32;i++) r->v[i]=0; -} - -void fe25519_neg(fe25519 *r, const fe25519 *x) -{ - fe25519 t; - int i; - for(i=0;i<32;i++) t.v[i]=x->v[i]; - fe25519_setzero(r); - fe25519_sub(r, r, &t); -} - -void fe25519_add(fe25519 *r, const fe25519 *x, const fe25519 *y) -{ - int i; - for(i=0;i<32;i++) r->v[i] = x->v[i] + y->v[i]; - reduce_add_sub(r); -} - -void fe25519_sub(fe25519 *r, const fe25519 *x, const fe25519 *y) -{ - int i; - crypto_uint32 t[32]; - t[0] = x->v[0] + 0x1da; - t[31] = x->v[31] + 0xfe; - for(i=1;i<31;i++) t[i] = x->v[i] + 0x1fe; - for(i=0;i<32;i++) r->v[i] = t[i] - y->v[i]; - reduce_add_sub(r); -} - -void fe25519_mul(fe25519 *r, const fe25519 *x, const fe25519 *y) -{ - int i,j; - crypto_uint32 t[63]; - for(i=0;i<63;i++)t[i] = 0; - - for(i=0;i<32;i++) - for(j=0;j<32;j++) - t[i+j] += x->v[i] * y->v[j]; - - for(i=32;i<63;i++) - r->v[i-32] = t[i-32] + 38*t[i]; - r->v[31] = t[31]; /* result now in r[0]...r[31] */ - - reduce_mul(r); -} - -void fe25519_square(fe25519 *r, const fe25519 *x) -{ - fe25519_mul(r, x, x); -} - -/*XXX: Make constant time! */ -void fe25519_pow(fe25519 *r, const fe25519 *x, const unsigned char *e) -{ - /* - fe25519 g; - fe25519_setone(&g); - int i; - unsigned char j; - for(i=32;i>0;i--) - { - for(j=128;j>0;j>>=1) - { - fe25519_square(&g,&g); - if(e[i-1] & j) - fe25519_mul(&g,&g,x); - } - } - for(i=0;i<32;i++) r->v[i] = g.v[i]; - */ - fe25519 g; - int i,j,k; - fe25519 t; - unsigned char w; - fe25519 pre[(1 << WINDOWSIZE)]; - - fe25519_setone(&g); - - // Precomputation - fe25519_setone(pre); - pre[1] = *x; - for(i=2;i<(1<<WINDOWSIZE);i+=2) - { - fe25519_square(pre+i, pre+i/2); - fe25519_mul(pre+i+1, pre+i, pre+1); - } - - // Fixed-window scalar multiplication - for(i=32;i>0;i--) - { - for(j=8-WINDOWSIZE;j>=0;j-=WINDOWSIZE) - { - for(k=0;k<WINDOWSIZE;k++) - fe25519_square(&g, &g); - // Cache-timing resistant loading of precomputed value: - w = (e[i-1]>>j) & WINDOWMASK; - t = pre[0]; - for(k=1;k<(1<<WINDOWSIZE);k++) - fe25519_cmov(&t, &pre[k], k==w); - fe25519_mul(&g, &g, &t); - } - } - *r = g; -} - -/* Return 0 on success, 1 otherwise */ -int fe25519_sqrt_vartime(fe25519 *r, const fe25519 *x, unsigned char parity) -{ - unsigned char e[32] = {0xfb,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x1f}; /* (p-1)/4 */ - unsigned char e2[32] = {0xfe,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x0f}; /* (p+3)/8 */ - unsigned char e3[32] = {0xfd,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x0f}; /* (p-5)/8 */ - fe25519 p = {{0}}; - fe25519 d; - int i; - - /* See HAC, Alg. 3.37 */ - if (!issquare(x)) return -1; - fe25519_pow(&d,x,e); - freeze(&d); - if(isone(&d)) - fe25519_pow(r,x,e2); - else - { - for(i=0;i<32;i++) - d.v[i] = 4*x->v[i]; - fe25519_pow(&d,&d,e3); - for(i=0;i<32;i++) - r->v[i] = 2*x->v[i]; - fe25519_mul(r,r,&d); - } - freeze(r); - if((r->v[0] & 1) != (parity & 1)) - { - fe25519_sub(r,&p,r); - } - return 0; -} - -void fe25519_invert(fe25519 *r, const fe25519 *x) -{ - fe25519 z2; - fe25519 z9; - fe25519 z11; - fe25519 z2_5_0; - fe25519 z2_10_0; - fe25519 z2_20_0; - fe25519 z2_50_0; - fe25519 z2_100_0; - fe25519 t0; - fe25519 t1; - int i; - - /* 2 */ fe25519_square(&z2,x); - /* 4 */ fe25519_square(&t1,&z2); - /* 8 */ fe25519_square(&t0,&t1); - /* 9 */ fe25519_mul(&z9,&t0,x); - /* 11 */ fe25519_mul(&z11,&z9,&z2); - /* 22 */ fe25519_square(&t0,&z11); - /* 2^5 - 2^0 = 31 */ fe25519_mul(&z2_5_0,&t0,&z9); - - /* 2^6 - 2^1 */ fe25519_square(&t0,&z2_5_0); - /* 2^7 - 2^2 */ fe25519_square(&t1,&t0); - /* 2^8 - 2^3 */ fe25519_square(&t0,&t1); - /* 2^9 - 2^4 */ fe25519_square(&t1,&t0); - /* 2^10 - 2^5 */ fe25519_square(&t0,&t1); - /* 2^10 - 2^0 */ fe25519_mul(&z2_10_0,&t0,&z2_5_0); - - /* 2^11 - 2^1 */ fe25519_square(&t0,&z2_10_0); - /* 2^12 - 2^2 */ fe25519_square(&t1,&t0); - /* 2^20 - 2^10 */ for (i = 2;i < 10;i += 2) { fe25519_square(&t0,&t1); fe25519_square(&t1,&t0); } - /* 2^20 - 2^0 */ fe25519_mul(&z2_20_0,&t1,&z2_10_0); - - /* 2^21 - 2^1 */ fe25519_square(&t0,&z2_20_0); - /* 2^22 - 2^2 */ fe25519_square(&t1,&t0); - /* 2^40 - 2^20 */ for (i = 2;i < 20;i += 2) { fe25519_square(&t0,&t1); fe25519_square(&t1,&t0); } - /* 2^40 - 2^0 */ fe25519_mul(&t0,&t1,&z2_20_0); - - /* 2^41 - 2^1 */ fe25519_square(&t1,&t0); - /* 2^42 - 2^2 */ fe25519_square(&t0,&t1); - /* 2^50 - 2^10 */ for (i = 2;i < 10;i += 2) { fe25519_square(&t1,&t0); fe25519_square(&t0,&t1); } - /* 2^50 - 2^0 */ fe25519_mul(&z2_50_0,&t0,&z2_10_0); - - /* 2^51 - 2^1 */ fe25519_square(&t0,&z2_50_0); - /* 2^52 - 2^2 */ fe25519_square(&t1,&t0); - /* 2^100 - 2^50 */ for (i = 2;i < 50;i += 2) { fe25519_square(&t0,&t1); fe25519_square(&t1,&t0); } - /* 2^100 - 2^0 */ fe25519_mul(&z2_100_0,&t1,&z2_50_0); - - /* 2^101 - 2^1 */ fe25519_square(&t1,&z2_100_0); - /* 2^102 - 2^2 */ fe25519_square(&t0,&t1); - /* 2^200 - 2^100 */ for (i = 2;i < 100;i += 2) { fe25519_square(&t1,&t0); fe25519_square(&t0,&t1); } - /* 2^200 - 2^0 */ fe25519_mul(&t1,&t0,&z2_100_0); - - /* 2^201 - 2^1 */ fe25519_square(&t0,&t1); - /* 2^202 - 2^2 */ fe25519_square(&t1,&t0); - /* 2^250 - 2^50 */ for (i = 2;i < 50;i += 2) { fe25519_square(&t0,&t1); fe25519_square(&t1,&t0); } - /* 2^250 - 2^0 */ fe25519_mul(&t0,&t1,&z2_50_0); - - /* 2^251 - 2^1 */ fe25519_square(&t1,&t0); - /* 2^252 - 2^2 */ fe25519_square(&t0,&t1); - /* 2^253 - 2^3 */ fe25519_square(&t1,&t0); - /* 2^254 - 2^4 */ fe25519_square(&t0,&t1); - /* 2^255 - 2^5 */ fe25519_square(&t1,&t0); - /* 2^255 - 21 */ fe25519_mul(r,&t1,&z11); -} |