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Diffstat (limited to 'src/crypto/nc-crypto.c')
| -rw-r--r-- | src/crypto/nc-crypto.c | 283 |
1 files changed, 0 insertions, 283 deletions
diff --git a/src/crypto/nc-crypto.c b/src/crypto/nc-crypto.c deleted file mode 100644 index 587d59d..0000000 --- a/src/crypto/nc-crypto.c +++ /dev/null @@ -1,283 +0,0 @@ -/* -* Copyright (c) 2024 Vaughn Nugent -* -* Package: noscrypt -* File: nc-crypto.c -* -* This library is free software; you can redistribute it and/or -* modify it under the terms of the GNU Lesser General Public License -* as published by the Free Software Foundation; either version 2.1 -* of the License, or (at your option) any later version. -* -* This library is distributed in the hope that it will be useful, -* but WITHOUT ANY WARRANTY; without even the implied warranty of -* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU -* Lesser General Public License for more details. -* -* You should have received a copy of the GNU Lesser General Public License -* along with noscrypt. If not, see http://www.gnu.org/licenses/. -*/ - -#include "nc-util.h" -#include "nc-crypto.h" - -/* -* Functions are not forced inline, just suggested. -* So unless it becomes a performance issue, I will leave -* most/all impl functions inline and let the compiler -* decide. -*/ - -#define _IMPLSTB static _nc_fn_inline - -/* -* Impl .c files may define the following macros for function implementations: -* -* _IMPL_SECURE_ZERO_MEMSET secure memset 0 function -* _IMPL_CHACHA20_CRYPT chacha20 cipher function -* _IMPL_CRYPTO_FIXED_TIME_COMPARE fixed time compare function -* _IMPL_CRYPTO_SHA256_HMAC sha256 hmac function -* _IMPL_CRYPTO_SHA256_DIGEST standard sha256 digest function -* _IMPL_CRYPTO_SHA256_HKDF_EXPAND hkdf expand function -* _IMPL_CRYPTO_SHA256_HKDF_EXTRACT hkdf extract function -* -* Macros are used to allow the preprocessor to select the correct implementation -* or raise errors if no implementation is defined. -* -* Implementation functions can assume inputs have been checked/sanitized by the -* calling function, and should return CSTATUS_OK on success, CSTATUS_FAIL on failure. -*/ - - -/* -* Prioritize embedded builds with mbedtls -*/ -#include "impl/mbedtls.c" - -/* -* Include openssl as an alternative default -* implementation -*/ -#include "impl/openssl.c" - -/* -* Include win32 platform specific fallback support -* using bcrypt. -*/ -#include "impl/bcrypt.c" - -/* -* Handle default implementations of secure -* memset 0 functions for each platform. -*/ -#ifndef _IMPL_SECURE_ZERO_MEMSET - /* only incude bzero if libc version greater than 2.25 */ - #if defined(__GLIBC__) && defined(__GLIBC_MINOR__) && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 25 - /* - * When using libc, we can use explicit_bzero - * as secure memset implementation. - * - * https://sourceware.org/glibc/manual/2.39/html_mono/libc.html#Erasing-Sensitive-Data - */ - #include <string.h> - extern void explicit_bzero(void* block, size_t len); - #define _IMPL_SECURE_ZERO_MEMSET explicit_bzero - #endif -#endif - -/* -* Finally fall back to monocipher to handle some -* that are not provided by other libraries. -* -* Platform specific opimizations are considered -* "better" than monocypher options, so this is -* added as a last resort. Momocypher is "correct" -* and portable, but not optimized for any specific -* platform. -*/ -#include "impl/monocypher.c" - - -#ifdef _IMPL_CRYPTO_SHA256_HMAC - - /* - * If a library does not provide a HKDF extract function, - * we can just use the HMAC function as a fallback. - * - * This is a fallback because another library may provide - * a more optimized implementation. - */ - - #ifndef _IMPL_CRYPTO_SHA256_HKDF_EXTRACT - - #define _IMPL_CRYPTO_SHA256_HKDF_EXTRACT _fallbackHkdfExtract - - _IMPLSTB cstatus_t _fallbackHkdfExtract(const cspan_t* salt, const cspan_t* ikm, sha256_t prk) - { - return _IMPL_CRYPTO_SHA256_HMAC(salt, ikm, prk); - } - - #endif /* !_IMPL_CRYPTO_SHA256_HKDF_EXTRACT */ - -#endif /* _IMPL_CRYPTO_SHA256_HMAC */ - -/* Fallback for fixed time comparison for all platforms */ -#ifndef _IMPL_CRYPTO_FIXED_TIME_COMPARE - - #pragma message("Warning: No fixed time compare implementation defined, using fallback. This may not be secure on all platforms") - - #define _IMPL_CRYPTO_FIXED_TIME_COMPARE _fallbackFixedTimeCompare - - /* - * This implemntation is a slightly simplified version of - * MBed TLS constant time memcmp function, knowm to be a 32bit - * integer size - */ - - static uint32_t _fallbackFixedTimeCompare(const uint8_t* a, const uint8_t* b, uint32_t size) - { - size_t i; - uint32_t result; - uint8_t O; - volatile const uint8_t* A, * B; - - result = 0; - O = 0; - A = (volatile const uint8_t*)a; - B = (volatile const uint8_t*)b; - - /* Compare each byte */ - for(i = 0; i < size; i++) - { - /* Handle volatile read */ - O |= (A[i] ^ B[i]); - - result |= O; - } - - return result; - } - -#endif /* !_IMPL_CRYPTO_FIXED_TIME_COMPARE */ - - -/* -* Internal function implementations that perform -* basic checking and call the correct implementation -* for the desired crypto impl. -* -* The following functions MUST be assumed to -* perform basic input validation. Since these apis are -* internal, debug asserts are used to ensure the -* function has been used correctly. -*/ - -void ncCryptoSecureZero(void* ptr, uint32_t size) -{ - DEBUG_ASSERT2(ptr != NULL, "Expected ptr to be non-null") - -#ifndef _IMPL_SECURE_ZERO_MEMSET - #error "No secure memset implementation defined" -#endif /* _IMPL_SECURE_ZERO_MEMSET */ - - _IMPL_SECURE_ZERO_MEMSET(ptr, size); -} - -uint32_t ncCryptoFixedTimeComp(const uint8_t* a, const uint8_t* b, uint32_t size) -{ - DEBUG_ASSERT2(a != NULL, "Expected a to be non-null") - DEBUG_ASSERT2(b != NULL, "Expected b to be non-null") - -#ifndef _IMPL_CRYPTO_FIXED_TIME_COMPARE - #error "No fixed time compare implementation defined" -#endif /* !_IMPL_CRYPTO_FIXED_TIME_COMPARE */ - - return _IMPL_CRYPTO_FIXED_TIME_COMPARE(a, b, size); -} - -cstatus_t ncCryptoDigestSha256(const cspan_t* data, sha256_t digestOut32) -{ - /* Debug arg validate */ - DEBUG_ASSERT2(data != NULL && data->data != NULL, "Expected data to be non-null") - DEBUG_ASSERT2(digestOut32 != NULL, "Expected digestOut32 to be non-null") - -#ifndef _IMPL_CRYPTO_SHA256_DIGEST - #error "No SHA256 implementation defined" -#endif /* !_IMPL_CRYPTO_SHA256_DIGEST */ - - return _IMPL_CRYPTO_SHA256_DIGEST(data, digestOut32); -} - -cstatus_t ncCryptoHmacSha256(const cspan_t* key, const cspan_t* data, sha256_t hmacOut32) -{ - /* Debug arg validate */ - DEBUG_ASSERT2(key != NULL && key->data != NULL, "Expected key to be non-null") - DEBUG_ASSERT2(data != NULL && data->data != NULL, "Expected data to be non-null") - DEBUG_ASSERT2(hmacOut32 != NULL && data->data != NULL, "Expected hmacOut32 to be non-null") - -#ifndef _IMPL_CRYPTO_SHA256_HMAC - #error "No SHA256 HMAC implementation defined" -#endif /* !_IMPL_CRYPTO_SHA256_HMAC */ - - return _IMPL_CRYPTO_SHA256_HMAC(key, data, hmacOut32); -} - -cstatus_t ncCryptoSha256HkdfExpand(const cspan_t* prk, const cspan_t* info, span_t* okm) -{ - /* Debug arg validate */ - DEBUG_ASSERT2(prk != NULL && prk->data != NULL, "Expected prk to be non-null") - DEBUG_ASSERT2(info != NULL && info->data != NULL, "Expected info to be non-null") - DEBUG_ASSERT2(okm != NULL && okm->data != NULL, "Expected okm to be non-null") - - /* - * RFC 5869: 2.3 - * "length of output keying material in octets (<= 255 * HashLen)" - * - * important as the counter is 1 byte, so it cannot overflow - */ - - if(okm->size > (uint32_t)(0xFFu * SHA256_DIGEST_SIZE)) - { - return CSTATUS_FAIL; - } - -#ifndef _IMPL_CRYPTO_SHA256_HKDF_EXPAND - #error "No SHA256 HKDF expand implementation defined" -#endif /* !_IMPL_CRYPTO_SHA256_HKDF_EXPAND */ - - return _IMPL_CRYPTO_SHA256_HKDF_EXPAND(prk, info, okm); -} - -cstatus_t ncCryptoSha256HkdfExtract(const cspan_t* salt, const cspan_t* ikm, sha256_t prk) -{ - /* Debug arg validate */ - DEBUG_ASSERT2(salt != NULL, "Expected salt to be non-null") - DEBUG_ASSERT2(ikm != NULL, "Expected ikm to be non-null") - DEBUG_ASSERT2(prk != NULL, "Expected prk to be non-null") - -#ifndef _IMPL_CRYPTO_SHA256_HKDF_EXTRACT - #error "No SHA256 HKDF extract implementation defined" -#endif /* !_IMPL_CRYPTO_SHA256_HKDF_EXTRACT */ - - return _IMPL_CRYPTO_SHA256_HKDF_EXTRACT(salt, ikm, prk); -} - -cstatus_t ncCryptoChacha20( - const uint8_t key[CHACHA_KEY_SIZE], - const uint8_t nonce[CHACHA_NONCE_SIZE], - const uint8_t* input, - uint8_t* output, - uint32_t dataSize -) -{ - DEBUG_ASSERT2(key != NULL, "Expected key to be non-null") - DEBUG_ASSERT2(nonce != NULL, "Expected nonce to be non-null") - DEBUG_ASSERT2(input != NULL, "Expected input to be non-null") - DEBUG_ASSERT2(output != NULL, "Expected output to be non-null") - -#ifndef _IMPL_CHACHA20_CRYPT - #error "No chacha20 implementation defined" -#endif /* !_IMPL_CHACHA20_CRYPT */ - - return _IMPL_CHACHA20_CRYPT(key, nonce, input, output, dataSize); -} |