diff options
Diffstat (limited to 'security/nss/lib/freebl/verified/Hacl_Curve25519_51.c')
| -rw-r--r-- | security/nss/lib/freebl/verified/Hacl_Curve25519_51.c | 296 |
1 files changed, 296 insertions, 0 deletions
diff --git a/security/nss/lib/freebl/verified/Hacl_Curve25519_51.c b/security/nss/lib/freebl/verified/Hacl_Curve25519_51.c new file mode 100644 index 0000000000..09bfc4be83 --- /dev/null +++ b/security/nss/lib/freebl/verified/Hacl_Curve25519_51.c @@ -0,0 +1,296 @@ +/* MIT License + * + * Copyright (c) 2016-2020 INRIA, CMU and Microsoft Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in all + * copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +#include "internal/Hacl_Curve25519_51.h" + +#include "internal/Hacl_Krmllib.h" + +static const uint8_t g25519[32U] = { (uint8_t)9U }; + +static void +point_add_and_double(uint64_t *q, uint64_t *p01_tmp1, FStar_UInt128_uint128 *tmp2) +{ + uint64_t *nq = p01_tmp1; + uint64_t *nq_p1 = p01_tmp1 + (uint32_t)10U; + uint64_t *tmp1 = p01_tmp1 + (uint32_t)20U; + uint64_t *x1 = q; + uint64_t *x2 = nq; + uint64_t *z2 = nq + (uint32_t)5U; + uint64_t *z3 = nq_p1 + (uint32_t)5U; + uint64_t *a = tmp1; + uint64_t *b = tmp1 + (uint32_t)5U; + uint64_t *ab = tmp1; + uint64_t *dc = tmp1 + (uint32_t)10U; + Hacl_Impl_Curve25519_Field51_fadd(a, x2, z2); + Hacl_Impl_Curve25519_Field51_fsub(b, x2, z2); + uint64_t *x3 = nq_p1; + uint64_t *z31 = nq_p1 + (uint32_t)5U; + uint64_t *d0 = dc; + uint64_t *c0 = dc + (uint32_t)5U; + Hacl_Impl_Curve25519_Field51_fadd(c0, x3, z31); + Hacl_Impl_Curve25519_Field51_fsub(d0, x3, z31); + Hacl_Impl_Curve25519_Field51_fmul2(dc, dc, ab, tmp2); + Hacl_Impl_Curve25519_Field51_fadd(x3, d0, c0); + Hacl_Impl_Curve25519_Field51_fsub(z31, d0, c0); + uint64_t *a1 = tmp1; + uint64_t *b1 = tmp1 + (uint32_t)5U; + uint64_t *d = tmp1 + (uint32_t)10U; + uint64_t *c = tmp1 + (uint32_t)15U; + uint64_t *ab1 = tmp1; + uint64_t *dc1 = tmp1 + (uint32_t)10U; + Hacl_Impl_Curve25519_Field51_fsqr2(dc1, ab1, tmp2); + Hacl_Impl_Curve25519_Field51_fsqr2(nq_p1, nq_p1, tmp2); + a1[0U] = c[0U]; + a1[1U] = c[1U]; + a1[2U] = c[2U]; + a1[3U] = c[3U]; + a1[4U] = c[4U]; + Hacl_Impl_Curve25519_Field51_fsub(c, d, c); + Hacl_Impl_Curve25519_Field51_fmul1(b1, c, (uint64_t)121665U); + Hacl_Impl_Curve25519_Field51_fadd(b1, b1, d); + Hacl_Impl_Curve25519_Field51_fmul2(nq, dc1, ab1, tmp2); + Hacl_Impl_Curve25519_Field51_fmul(z3, z3, x1, tmp2); +} + +static void +point_double(uint64_t *nq, uint64_t *tmp1, FStar_UInt128_uint128 *tmp2) +{ + uint64_t *x2 = nq; + uint64_t *z2 = nq + (uint32_t)5U; + uint64_t *a = tmp1; + uint64_t *b = tmp1 + (uint32_t)5U; + uint64_t *d = tmp1 + (uint32_t)10U; + uint64_t *c = tmp1 + (uint32_t)15U; + uint64_t *ab = tmp1; + uint64_t *dc = tmp1 + (uint32_t)10U; + Hacl_Impl_Curve25519_Field51_fadd(a, x2, z2); + Hacl_Impl_Curve25519_Field51_fsub(b, x2, z2); + Hacl_Impl_Curve25519_Field51_fsqr2(dc, ab, tmp2); + a[0U] = c[0U]; + a[1U] = c[1U]; + a[2U] = c[2U]; + a[3U] = c[3U]; + a[4U] = c[4U]; + Hacl_Impl_Curve25519_Field51_fsub(c, d, c); + Hacl_Impl_Curve25519_Field51_fmul1(b, c, (uint64_t)121665U); + Hacl_Impl_Curve25519_Field51_fadd(b, b, d); + Hacl_Impl_Curve25519_Field51_fmul2(nq, dc, ab, tmp2); +} + +static void +montgomery_ladder(uint64_t *out, uint8_t *key, uint64_t *init) +{ + FStar_UInt128_uint128 tmp2[10U]; + for (uint32_t _i = 0U; _i < (uint32_t)10U; ++_i) + tmp2[_i] = FStar_UInt128_uint64_to_uint128((uint64_t)0U); + uint64_t p01_tmp1_swap[41U] = { 0U }; + uint64_t *p0 = p01_tmp1_swap; + uint64_t *p01 = p01_tmp1_swap; + uint64_t *p03 = p01; + uint64_t *p11 = p01 + (uint32_t)10U; + memcpy(p11, init, (uint32_t)10U * sizeof(uint64_t)); + uint64_t *x0 = p03; + uint64_t *z0 = p03 + (uint32_t)5U; + x0[0U] = (uint64_t)1U; + x0[1U] = (uint64_t)0U; + x0[2U] = (uint64_t)0U; + x0[3U] = (uint64_t)0U; + x0[4U] = (uint64_t)0U; + z0[0U] = (uint64_t)0U; + z0[1U] = (uint64_t)0U; + z0[2U] = (uint64_t)0U; + z0[3U] = (uint64_t)0U; + z0[4U] = (uint64_t)0U; + uint64_t *p01_tmp1 = p01_tmp1_swap; + uint64_t *p01_tmp11 = p01_tmp1_swap; + uint64_t *nq1 = p01_tmp1_swap; + uint64_t *nq_p11 = p01_tmp1_swap + (uint32_t)10U; + uint64_t *swap = p01_tmp1_swap + (uint32_t)40U; + Hacl_Impl_Curve25519_Field51_cswap2((uint64_t)1U, nq1, nq_p11); + point_add_and_double(init, p01_tmp11, tmp2); + swap[0U] = (uint64_t)1U; + for (uint32_t i = (uint32_t)0U; i < (uint32_t)251U; i++) { + uint64_t *p01_tmp12 = p01_tmp1_swap; + uint64_t *swap1 = p01_tmp1_swap + (uint32_t)40U; + uint64_t *nq2 = p01_tmp12; + uint64_t *nq_p12 = p01_tmp12 + (uint32_t)10U; + uint64_t + bit = + (uint64_t)(key[((uint32_t)253U - i) / (uint32_t)8U] >> ((uint32_t)253U - i) % (uint32_t)8U & (uint8_t)1U); + uint64_t sw = swap1[0U] ^ bit; + Hacl_Impl_Curve25519_Field51_cswap2(sw, nq2, nq_p12); + point_add_and_double(init, p01_tmp12, tmp2); + swap1[0U] = bit; + } + uint64_t sw = swap[0U]; + Hacl_Impl_Curve25519_Field51_cswap2(sw, nq1, nq_p11); + uint64_t *nq10 = p01_tmp1; + uint64_t *tmp1 = p01_tmp1 + (uint32_t)20U; + point_double(nq10, tmp1, tmp2); + point_double(nq10, tmp1, tmp2); + point_double(nq10, tmp1, tmp2); + memcpy(out, p0, (uint32_t)10U * sizeof(uint64_t)); +} + +void +Hacl_Curve25519_51_fsquare_times( + uint64_t *o, + uint64_t *inp, + FStar_UInt128_uint128 *tmp, + uint32_t n) +{ + Hacl_Impl_Curve25519_Field51_fsqr(o, inp, tmp); + for (uint32_t i = (uint32_t)0U; i < n - (uint32_t)1U; i++) { + Hacl_Impl_Curve25519_Field51_fsqr(o, o, tmp); + } +} + +void +Hacl_Curve25519_51_finv(uint64_t *o, uint64_t *i, FStar_UInt128_uint128 *tmp) +{ + uint64_t t1[20U] = { 0U }; + uint64_t *a1 = t1; + uint64_t *b1 = t1 + (uint32_t)5U; + uint64_t *t010 = t1 + (uint32_t)15U; + FStar_UInt128_uint128 *tmp10 = tmp; + Hacl_Curve25519_51_fsquare_times(a1, i, tmp10, (uint32_t)1U); + Hacl_Curve25519_51_fsquare_times(t010, a1, tmp10, (uint32_t)2U); + Hacl_Impl_Curve25519_Field51_fmul(b1, t010, i, tmp); + Hacl_Impl_Curve25519_Field51_fmul(a1, b1, a1, tmp); + Hacl_Curve25519_51_fsquare_times(t010, a1, tmp10, (uint32_t)1U); + Hacl_Impl_Curve25519_Field51_fmul(b1, t010, b1, tmp); + Hacl_Curve25519_51_fsquare_times(t010, b1, tmp10, (uint32_t)5U); + Hacl_Impl_Curve25519_Field51_fmul(b1, t010, b1, tmp); + uint64_t *b10 = t1 + (uint32_t)5U; + uint64_t *c10 = t1 + (uint32_t)10U; + uint64_t *t011 = t1 + (uint32_t)15U; + FStar_UInt128_uint128 *tmp11 = tmp; + Hacl_Curve25519_51_fsquare_times(t011, b10, tmp11, (uint32_t)10U); + Hacl_Impl_Curve25519_Field51_fmul(c10, t011, b10, tmp); + Hacl_Curve25519_51_fsquare_times(t011, c10, tmp11, (uint32_t)20U); + Hacl_Impl_Curve25519_Field51_fmul(t011, t011, c10, tmp); + Hacl_Curve25519_51_fsquare_times(t011, t011, tmp11, (uint32_t)10U); + Hacl_Impl_Curve25519_Field51_fmul(b10, t011, b10, tmp); + Hacl_Curve25519_51_fsquare_times(t011, b10, tmp11, (uint32_t)50U); + Hacl_Impl_Curve25519_Field51_fmul(c10, t011, b10, tmp); + uint64_t *b11 = t1 + (uint32_t)5U; + uint64_t *c1 = t1 + (uint32_t)10U; + uint64_t *t01 = t1 + (uint32_t)15U; + FStar_UInt128_uint128 *tmp1 = tmp; + Hacl_Curve25519_51_fsquare_times(t01, c1, tmp1, (uint32_t)100U); + Hacl_Impl_Curve25519_Field51_fmul(t01, t01, c1, tmp); + Hacl_Curve25519_51_fsquare_times(t01, t01, tmp1, (uint32_t)50U); + Hacl_Impl_Curve25519_Field51_fmul(t01, t01, b11, tmp); + Hacl_Curve25519_51_fsquare_times(t01, t01, tmp1, (uint32_t)5U); + uint64_t *a = t1; + uint64_t *t0 = t1 + (uint32_t)15U; + Hacl_Impl_Curve25519_Field51_fmul(o, t0, a, tmp); +} + +static void +encode_point(uint8_t *o, uint64_t *i) +{ + uint64_t *x = i; + uint64_t *z = i + (uint32_t)5U; + uint64_t tmp[5U] = { 0U }; + uint64_t u64s[4U] = { 0U }; + FStar_UInt128_uint128 tmp_w[10U]; + for (uint32_t _i = 0U; _i < (uint32_t)10U; ++_i) + tmp_w[_i] = FStar_UInt128_uint64_to_uint128((uint64_t)0U); + Hacl_Curve25519_51_finv(tmp, z, tmp_w); + Hacl_Impl_Curve25519_Field51_fmul(tmp, tmp, x, tmp_w); + Hacl_Impl_Curve25519_Field51_store_felem(u64s, tmp); + KRML_MAYBE_FOR4(i0, + (uint32_t)0U, + (uint32_t)4U, + (uint32_t)1U, + store64_le(o + i0 * (uint32_t)8U, u64s[i0]);); +} + +void +Hacl_Curve25519_51_scalarmult(uint8_t *out, uint8_t *priv, uint8_t *pub) +{ + uint64_t init[10U] = { 0U }; + uint64_t tmp[4U] = { 0U }; + KRML_MAYBE_FOR4(i, + (uint32_t)0U, + (uint32_t)4U, + (uint32_t)1U, + uint64_t *os = tmp; + uint8_t *bj = pub + i * (uint32_t)8U; + uint64_t u = load64_le(bj); + uint64_t r = u; + uint64_t x = r; + os[i] = x;); + uint64_t tmp3 = tmp[3U]; + tmp[3U] = tmp3 & (uint64_t)0x7fffffffffffffffU; + uint64_t *x = init; + uint64_t *z = init + (uint32_t)5U; + z[0U] = (uint64_t)1U; + z[1U] = (uint64_t)0U; + z[2U] = (uint64_t)0U; + z[3U] = (uint64_t)0U; + z[4U] = (uint64_t)0U; + uint64_t f0l = tmp[0U] & (uint64_t)0x7ffffffffffffU; + uint64_t f0h = tmp[0U] >> (uint32_t)51U; + uint64_t f1l = (tmp[1U] & (uint64_t)0x3fffffffffU) << (uint32_t)13U; + uint64_t f1h = tmp[1U] >> (uint32_t)38U; + uint64_t f2l = (tmp[2U] & (uint64_t)0x1ffffffU) << (uint32_t)26U; + uint64_t f2h = tmp[2U] >> (uint32_t)25U; + uint64_t f3l = (tmp[3U] & (uint64_t)0xfffU) << (uint32_t)39U; + uint64_t f3h = tmp[3U] >> (uint32_t)12U; + x[0U] = f0l; + x[1U] = f0h | f1l; + x[2U] = f1h | f2l; + x[3U] = f2h | f3l; + x[4U] = f3h; + montgomery_ladder(init, priv, init); + encode_point(out, init); +} + +void +Hacl_Curve25519_51_secret_to_public(uint8_t *pub, uint8_t *priv) +{ + uint8_t basepoint[32U] = { 0U }; + for (uint32_t i = (uint32_t)0U; i < (uint32_t)32U; i++) { + uint8_t *os = basepoint; + uint8_t x = g25519[i]; + os[i] = x; + } + Hacl_Curve25519_51_scalarmult(pub, priv, basepoint); +} + +bool +Hacl_Curve25519_51_ecdh(uint8_t *out, uint8_t *priv, uint8_t *pub) +{ + uint8_t zeros[32U] = { 0U }; + Hacl_Curve25519_51_scalarmult(out, priv, pub); + uint8_t res = (uint8_t)255U; + for (uint32_t i = (uint32_t)0U; i < (uint32_t)32U; i++) { + uint8_t uu____0 = FStar_UInt8_eq_mask(out[i], zeros[i]); + res = uu____0 & res; + } + uint8_t z = res; + bool r = z == (uint8_t)255U; + return !r; +} |