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This commit is contained in:
Frank Denis 2022-10-21 17:54:39 +02:00
parent c33ab2d45c
commit fd5cbe9e69
2 changed files with 79 additions and 79 deletions
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56
src/libsodium/crypto_scalarmult/curve25519/sandy2x/curve25519_sandy2x.c
View File

@ -24,42 +24,42 @@ static int
crypto_scalarmult_curve25519_sandy2x(unsigned char *q, const unsigned char *n, crypto_scalarmult_curve25519_sandy2x(unsigned char *q, const unsigned char *n,
const unsigned char *p) const unsigned char *p)
{ {
unsigned char t[32]; unsigned char t[32];
fe var[3]; fe var[3];
fe51 x_51; fe51 x_51;
fe51 z_51; fe51 z_51;
unsigned int i; unsigned int i;
for (i = 0; i < 32; i++) { for (i = 0; i < 32; i++) {
t[i] = n[i]; t[i] = n[i];
} }
t[0] &= 248; t[0] &= 248;
t[31] &= 127; t[31] &= 127;
t[31] |= 64; t[31] |= 64;
fe_frombytes(x1, p); fe_frombytes(x1, p);
ladder(var, t); ladder(var, t);
z_51.v[0] = (z2[1] << 26) + z2[0]; z_51.v[0] = (z2[1] << 26) + z2[0];
z_51.v[1] = (z2[3] << 26) + z2[2]; z_51.v[1] = (z2[3] << 26) + z2[2];
z_51.v[2] = (z2[5] << 26) + z2[4]; z_51.v[2] = (z2[5] << 26) + z2[4];
z_51.v[3] = (z2[7] << 26) + z2[6]; z_51.v[3] = (z2[7] << 26) + z2[6];
z_51.v[4] = (z2[9] << 26) + z2[8]; z_51.v[4] = (z2[9] << 26) + z2[8];
x_51.v[0] = (x2[1] << 26) + x2[0]; x_51.v[0] = (x2[1] << 26) + x2[0];
x_51.v[1] = (x2[3] << 26) + x2[2]; x_51.v[1] = (x2[3] << 26) + x2[2];
x_51.v[2] = (x2[5] << 26) + x2[4]; x_51.v[2] = (x2[5] << 26) + x2[4];
x_51.v[3] = (x2[7] << 26) + x2[6]; x_51.v[3] = (x2[7] << 26) + x2[6];
x_51.v[4] = (x2[9] << 26) + x2[8]; x_51.v[4] = (x2[9] << 26) + x2[8];
fe51_invert(&z_51, &z_51); fe51_invert(&z_51, &z_51);
fe51_mul(&x_51, &x_51, &z_51); fe51_mul(&x_51, &x_51, &z_51);
fe51_pack(q, &x_51); fe51_pack(q, &x_51);
sodium_memzero(t, sizeof t); sodium_memzero(t, sizeof t);
return 0; return 0;
} }
struct crypto_scalarmult_curve25519_implementation struct crypto_scalarmult_curve25519_implementation

102
src/libsodium/crypto_scalarmult/curve25519/sandy2x/fe_frombytes_sandy2x.c
View File

@ -9,70 +9,70 @@
static uint64_t static uint64_t
load_3(const unsigned char *in) load_3(const unsigned char *in)
{ {
uint64_t result; uint64_t result;
result = (uint64_t) in[0]; result = (uint64_t) in[0];
result |= ((uint64_t) in[1]) << 8; result |= ((uint64_t) in[1]) << 8;
result |= ((uint64_t) in[2]) << 16; result |= ((uint64_t) in[2]) << 16;
return result; return result;
} }
static uint64_t static uint64_t
load_4(const unsigned char *in) load_4(const unsigned char *in)
{ {
uint64_t result; uint64_t result;
result = (uint64_t) in[0]; result = (uint64_t) in[0];
result |= ((uint64_t) in[1]) << 8; result |= ((uint64_t) in[1]) << 8;
result |= ((uint64_t) in[2]) << 16; result |= ((uint64_t) in[2]) << 16;
result |= ((uint64_t) in[3]) << 24; result |= ((uint64_t) in[3]) << 24;
return result; return result;
} }
void void
fe_frombytes(fe h, const unsigned char *s) fe_frombytes(fe h, const unsigned char *s)
{ {
uint64_t h0 = load_4(s); uint64_t h0 = load_4(s);
uint64_t h1 = load_3(s + 4) << 6; uint64_t h1 = load_3(s + 4) << 6;
uint64_t h2 = load_3(s + 7) << 5; uint64_t h2 = load_3(s + 7) << 5;
uint64_t h3 = load_3(s + 10) << 3; uint64_t h3 = load_3(s + 10) << 3;
uint64_t h4 = load_3(s + 13) << 2; uint64_t h4 = load_3(s + 13) << 2;
uint64_t h5 = load_4(s + 16); uint64_t h5 = load_4(s + 16);
uint64_t h6 = load_3(s + 20) << 7; uint64_t h6 = load_3(s + 20) << 7;
uint64_t h7 = load_3(s + 23) << 5; uint64_t h7 = load_3(s + 23) << 5;
uint64_t h8 = load_3(s + 26) << 4; uint64_t h8 = load_3(s + 26) << 4;
uint64_t h9 = (load_3(s + 29) & 8388607) << 2; uint64_t h9 = (load_3(s + 29) & 8388607) << 2;
uint64_t carry0; uint64_t carry0;
uint64_t carry1; uint64_t carry1;
uint64_t carry2; uint64_t carry2;
uint64_t carry3; uint64_t carry3;
uint64_t carry4; uint64_t carry4;
uint64_t carry5; uint64_t carry5;
uint64_t carry6; uint64_t carry6;
uint64_t carry7; uint64_t carry7;
uint64_t carry8; uint64_t carry8;
uint64_t carry9; uint64_t carry9;
carry9 = h9 >> 25; h0 += carry9 * 19; h9 &= 0x1FFFFFF; carry9 = h9 >> 25; h0 += carry9 * 19; h9 &= 0x1FFFFFF;
carry1 = h1 >> 25; h2 += carry1; h1 &= 0x1FFFFFF; carry1 = h1 >> 25; h2 += carry1; h1 &= 0x1FFFFFF;
carry3 = h3 >> 25; h4 += carry3; h3 &= 0x1FFFFFF; carry3 = h3 >> 25; h4 += carry3; h3 &= 0x1FFFFFF;
carry5 = h5 >> 25; h6 += carry5; h5 &= 0x1FFFFFF; carry5 = h5 >> 25; h6 += carry5; h5 &= 0x1FFFFFF;
carry7 = h7 >> 25; h8 += carry7; h7 &= 0x1FFFFFF; carry7 = h7 >> 25; h8 += carry7; h7 &= 0x1FFFFFF;
carry0 = h0 >> 26; h1 += carry0; h0 &= 0x3FFFFFF; carry0 = h0 >> 26; h1 += carry0; h0 &= 0x3FFFFFF;
carry2 = h2 >> 26; h3 += carry2; h2 &= 0x3FFFFFF; carry2 = h2 >> 26; h3 += carry2; h2 &= 0x3FFFFFF;
carry4 = h4 >> 26; h5 += carry4; h4 &= 0x3FFFFFF; carry4 = h4 >> 26; h5 += carry4; h4 &= 0x3FFFFFF;
carry6 = h6 >> 26; h7 += carry6; h6 &= 0x3FFFFFF; carry6 = h6 >> 26; h7 += carry6; h6 &= 0x3FFFFFF;
carry8 = h8 >> 26; h9 += carry8; h8 &= 0x3FFFFFF; carry8 = h8 >> 26; h9 += carry8; h8 &= 0x3FFFFFF;
h[0] = h0; h[0] = h0;
h[1] = h1; h[1] = h1;
h[2] = h2; h[2] = h2;
h[3] = h3; h[3] = h3;
h[4] = h4; h[4] = h4;
h[5] = h5; h[5] = h5;
h[6] = h6; h[6] = h6;
h[7] = h7; h[7] = h7;
h[8] = h8; h[8] = h8;
h[9] = h9; h[9] = h9;
} }
#endif #endif