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Diffstat (limited to '')
| -rw-r--r-- | security/nss/lib/freebl/verified/Hacl_P521.c | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/security/nss/lib/freebl/verified/Hacl_P521.c b/security/nss/lib/freebl/verified/Hacl_P521.c new file mode 100644 index 0000000000..481a64b96f --- /dev/null +++ b/security/nss/lib/freebl/verified/Hacl_P521.c @@ -0,0 +1,131 @@ +/* MIT License + * + * Copyright (c) 2016-2022 INRIA, CMU and Microsoft Corporation + * Copyright (c) 2022-2023 HACL* Contributors + * + * 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 "Hacl_P521.h" + +#include "internal/Hacl_Krmllib.h" +#include "internal/Hacl_Bignum_Base.h" + +static inline uint64_t +bn_is_eq_mask(uint64_t *x, uint64_t *y) +{ + uint64_t mask = (uint64_t)0xFFFFFFFFFFFFFFFFU; + KRML_MAYBE_FOR9(i, + (uint32_t)0U, + (uint32_t)9U, + (uint32_t)1U, + uint64_t uu____0 = FStar_UInt64_eq_mask(x[i], y[i]); + mask = uu____0 & mask;); + uint64_t mask1 = mask; + return mask1; +} + +static inline uint64_t +bn_sub(uint64_t *a, uint64_t *b, uint64_t *c) +{ + uint64_t c1 = (uint64_t)0U; + KRML_MAYBE_FOR2(i, + (uint32_t)0U, + (uint32_t)2U, + (uint32_t)1U, + uint64_t t1 = b[(uint32_t)4U * i]; + uint64_t t20 = c[(uint32_t)4U * i]; + uint64_t *res_i0 = a + (uint32_t)4U * i; + c1 = Lib_IntTypes_Intrinsics_sub_borrow_u64(c1, t1, t20, res_i0); + uint64_t t10 = b[(uint32_t)4U * i + (uint32_t)1U]; + uint64_t t21 = c[(uint32_t)4U * i + (uint32_t)1U]; + uint64_t *res_i1 = a + (uint32_t)4U * i + (uint32_t)1U; + c1 = Lib_IntTypes_Intrinsics_sub_borrow_u64(c1, t10, t21, res_i1); + uint64_t t11 = b[(uint32_t)4U * i + (uint32_t)2U]; + uint64_t t22 = c[(uint32_t)4U * i + (uint32_t)2U]; + uint64_t *res_i2 = a + (uint32_t)4U * i + (uint32_t)2U; + c1 = Lib_IntTypes_Intrinsics_sub_borrow_u64(c1, t11, t22, res_i2); + uint64_t t12 = b[(uint32_t)4U * i + (uint32_t)3U]; + uint64_t t2 = c[(uint32_t)4U * i + (uint32_t)3U]; + uint64_t *res_i = a + (uint32_t)4U * i + (uint32_t)3U; + c1 = Lib_IntTypes_Intrinsics_sub_borrow_u64(c1, t12, t2, res_i);); + { + uint64_t t1 = b[8U]; + uint64_t t2 = c[8U]; + uint64_t *res_i = a + (uint32_t)8U; + c1 = Lib_IntTypes_Intrinsics_sub_borrow_u64(c1, t1, t2, res_i); + } + uint64_t c10 = c1; + return c10; +} + +static inline void +bn_from_bytes_be(uint64_t *a, uint8_t *b) +{ + uint8_t tmp[72U] = { 0U }; + memcpy(tmp + (uint32_t)6U, b, (uint32_t)66U * sizeof(uint8_t)); + KRML_MAYBE_FOR9(i, + (uint32_t)0U, + (uint32_t)9U, + (uint32_t)1U, + uint64_t *os = a; + uint64_t u = load64_be(tmp + ((uint32_t)9U - i - (uint32_t)1U) * (uint32_t)8U); + uint64_t x = u; + os[i] = x;); +} + +static inline void +p521_make_order(uint64_t *n) +{ + n[0U] = (uint64_t)0xbb6fb71e91386409U; + n[1U] = (uint64_t)0x3bb5c9b8899c47aeU; + n[2U] = (uint64_t)0x7fcc0148f709a5d0U; + n[3U] = (uint64_t)0x51868783bf2f966bU; + n[4U] = (uint64_t)0xfffffffffffffffaU; + n[5U] = (uint64_t)0xffffffffffffffffU; + n[6U] = (uint64_t)0xffffffffffffffffU; + n[7U] = (uint64_t)0xffffffffffffffffU; + n[8U] = (uint64_t)0x1ffU; +} + +/** +Private key validation. + + The function returns `true` if a private key is valid and `false` otherwise. + + The argument `private_key` points to 66 bytes of valid memory, i.e., uint8_t[66]. + + The private key is valid: + • 0 < `private_key` < the order of the curve +*/ +bool +Hacl_P521_validate_private_key(uint8_t *private_key) +{ + uint64_t bn_sk[9U] = { 0U }; + bn_from_bytes_be(bn_sk, private_key); + uint64_t tmp[9U] = { 0U }; + p521_make_order(tmp); + uint64_t c = bn_sub(tmp, bn_sk, tmp); + uint64_t is_lt_order = (uint64_t)0U - c; + uint64_t bn_zero[9U] = { 0U }; + uint64_t res = bn_is_eq_mask(bn_sk, bn_zero); + uint64_t is_eq_zero = res; + uint64_t res0 = is_lt_order & ~is_eq_zero; + return res0 == (uint64_t)0xFFFFFFFFFFFFFFFFU; +} |