diff options
Diffstat (limited to 'src/crypto')
| -rw-r--r-- | src/crypto/impl/bcrypt.c | 295 | ||||
| -rw-r--r-- | src/crypto/impl/mbedtls.c | 170 | ||||
| -rw-r--r-- | src/crypto/impl/monocypher.c | 83 | ||||
| -rw-r--r-- | src/crypto/impl/openssl.c | 46 | ||||
| -rw-r--r-- | src/crypto/nc-crypto.c | 272 | ||||
| -rw-r--r-- | src/crypto/nc-crypto.h | 73 |
6 files changed, 939 insertions, 0 deletions
diff --git a/src/crypto/impl/bcrypt.c b/src/crypto/impl/bcrypt.c new file mode 100644 index 0000000..970f68f --- /dev/null +++ b/src/crypto/impl/bcrypt.c @@ -0,0 +1,295 @@ +/* +* Copyright (c) 2024 Vaughn Nugent +* +* Package: noscrypt +* File: impl/bcrypt.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/. +*/ + + +/* +* This file provides as many fallback implementations on Windows plaforms +* as possible using the bcrypt library. This file should be included behind +* other libarry implementations, as it is a fallback. +*/ + +#ifdef _NC_IS_WINDOWS + +#define WIN32_LEAN_AND_MEAN +#include <Windows.h> +#include <bcrypt.h> + +#include "nc-util.h" + +#define IF_BC_FAIL(x) if(!BCRYPT_SUCCESS(x)) + +struct _bcrypt_ctx +{ + BCRYPT_ALG_HANDLE hAlg; + BCRYPT_HASH_HANDLE hHash; +}; + +_IMPLSTB NTSTATUS _bcInitSha256(struct _bcrypt_ctx* ctx, DWORD flags) +{ + NTSTATUS result; + + result = BCryptOpenAlgorithmProvider( + &ctx->hAlg, + BCRYPT_SHA256_ALGORITHM, + NULL, + flags + ); + + /* + * If operation failed, ensure the algorithm handle is null + * to make free code easier to cleanup + */ + if (!BCRYPT_SUCCESS(result)) + { + ctx->hAlg = NULL; + } + + return result; +} + +_IMPLSTB NTSTATUS _bcCreateHmac(struct _bcrypt_ctx* ctx, const cspan_t* key) +{ + /* + * NOTE: + * I am not explicitly managing the hash object buffer. By setting + * the hash object to NULL, and length to 0, the buffer will be + * managed by the bcrypt library. + * + * See: https://learn.microsoft.com/en-us/windows/win32/api/bcrypt/nf-bcrypt-bcryptcreatehash + */ + + return BCryptCreateHash( + ctx->hAlg, + &ctx->hHash, + NULL, + 0, + (uint8_t*)key->data, + key->size, + BCRYPT_HASH_REUSABLE_FLAG /* Enable reusable for expand function */ + ); +} + +_IMPLSTB NTSTATUS _bcCreate(struct _bcrypt_ctx* ctx) +{ + cspan_t key; + + /* Zero out key span for 0 size and NULL data ptr */ + SecureZeroMemory(&key, sizeof(cspan_t)); + + return _bcCreateHmac(ctx, &key); +} + +_IMPLSTB NTSTATUS _bcHashDataRaw(const struct _bcrypt_ctx* ctx, const uint8_t* data, uint32_t len) +{ + return BCryptHashData(ctx->hHash, (uint8_t*)data, len, 0); +} + +_IMPLSTB NTSTATUS _bcHashData(const struct _bcrypt_ctx* ctx, const cspan_t* data) +{ + return _bcHashDataRaw(ctx, data->data, data->size); +} + +_IMPLSTB NTSTATUS _bcFinishHash(const struct _bcrypt_ctx* ctx, sha256_t digestOut32) +{ + return BCryptFinishHash(ctx->hHash, digestOut32, sizeof(sha256_t), 0); +} + +_IMPLSTB void _bcDestroyCtx(struct _bcrypt_ctx* ctx) +{ + /* Free the hash memory if it was allocated */ + if(ctx->hHash) BCryptDestroyHash(ctx->hHash); + + /* Close the algorithm provider */ + if (ctx->hAlg) BCryptCloseAlgorithmProvider(ctx->hAlg, 0); + + ctx->hAlg = NULL; + ctx->hHash = NULL; +} + +#ifndef _IMPL_SECURE_ZERO_MEMSET + /* + * On Windows, we can use SecureZeroMemory + * as platform zeroing function. + * + * NOTE: + * SecureZeroMemory2 uses volitle function argument + * pointers, which is a contested mehtod of compiler + * optimization prevention. GNU seems to oppose this method + * + * https://learn.microsoft.com/en-us/windows/win32/memory/winbase-securezeromemory2 + */ + #define _IMPL_SECURE_ZERO_MEMSET SecureZeroMemory +#endif /* !_IMPL_SECURE_ZERO_MEMSET */ + +/* +* Provide win32 fallback for sha256 digest if needed +*/ + +#ifndef _IMPL_CRYPTO_SHA256_DIGEST + + /* Export function fallack */ + #define _IMPL_CRYPTO_SHA256_DIGEST _bcrypt_sha256_digest + + _IMPLSTB cstatus_t _bcrypt_sha256_digest(const cspan_t* data, sha256_t digestOut32) + { + cstatus_t result; + struct _bcrypt_ctx ctx; + + result = CSTATUS_FAIL; /* Start in fail state */ + + IF_BC_FAIL(_bcInitSha256(&ctx, 0)) goto Exit; + + IF_BC_FAIL(_bcCreate(&ctx)) goto Exit; + + IF_BC_FAIL(_bcHashData(&ctx, data)) goto Exit; + + IF_BC_FAIL(_bcFinishHash(&ctx, digestOut32)) goto Exit; + + result = CSTATUS_OK; /* Hash operation completed, so set success */ + + Exit: + + _bcDestroyCtx(&ctx); + + return result; + } + +#endif /* !_IMPL_CRYPTO_SHA256_DIGEST */ + +#ifndef _IMPL_CRYPTO_SHA256_HMAC + + /* Export function */ + #define _IMPL_CRYPTO_SHA256_HMAC _bcrypt_hmac_sha256 + + _IMPLSTB cstatus_t _bcrypt_hmac_sha256(const cspan_t* key, const cspan_t* data, sha256_t hmacOut32) + { + cstatus_t result; + struct _bcrypt_ctx ctx; + + result = CSTATUS_FAIL; /* Start in fail state */ + + /* Init context with hmac flag set */ + IF_BC_FAIL(_bcInitSha256(&ctx, BCRYPT_ALG_HANDLE_HMAC_FLAG)) goto Exit; + + IF_BC_FAIL(_bcCreateHmac(&ctx, key)) goto Exit; + + IF_BC_FAIL(_bcHashData(&ctx, data)) goto Exit; + + IF_BC_FAIL(_bcFinishHash(&ctx, hmacOut32)) goto Exit; + + result = CSTATUS_OK; /* HMAC operation completed, so set success */ + + Exit: + + _bcDestroyCtx(&ctx); + + return result; + } + +#endif /* !_IMPL_CRYPTO_SHA256_HMAC */ + +/* +* Provide a fallback HKDF expand function using the +* HMAC function as a base. +*/ + +#ifndef _IMPL_CRYPTO_SHA256_HKDF_EXPAND + + #define _IMPL_CRYPTO_SHA256_HKDF_EXPAND _bcrypt_fallback_hkdf_expand + + /* Include string for memmove */ + #include <string.h> + + static void ncWriteSpanS(span_t* span, uint32_t offset, const uint8_t* data, uint32_t size) + { + DEBUG_ASSERT2(span != NULL, "Expected span to be non-null") + DEBUG_ASSERT2(data != NULL, "Expected data to be non-null") + DEBUG_ASSERT2(offset + size <= span->size, "Expected offset + size to be less than span size") + + /* Copy data to span */ + memmove(span->data + offset, data, size); + } + + STATIC_ASSERT(HKDF_IN_BUF_SIZE > SHA256_DIGEST_SIZE, "HDK Buffer must be at least the size of the underlying hashing alg output") + + /* + * The following functions implements the HKDF expand function using an existing + * HMAC function. This is a fallback implementation for Windows platforms at the moment. + * + * This follows the guidence from RFC 5869: https://tools.ietf.org/html/rfc5869 + */ + + #define _BC_MIN(a, b) (a < b ? a : b) + + _IMPLSTB cstatus_t _bcrypt_fallback_hkdf_expand(const cspan_t* prk, const cspan_t* info, span_t* okm) + { + cstatus_t result; + struct _bcrypt_ctx ctx; + + uint8_t counter; + uint32_t tLen, okmOffset; + uint8_t t[HKDF_IN_BUF_SIZE]; + + _IMPL_SECURE_ZERO_MEMSET(t, sizeof(t)); + + tLen = 0; /* T(0) is an empty string(zero length) */ + okmOffset = 0; + result = CSTATUS_FAIL; /* Start in fail state */ + + /* Init context with hmac flag set, it will be reused */ + IF_BC_FAIL(_bcInitSha256(&ctx, BCRYPT_ALG_HANDLE_HMAC_FLAG)) goto Exit; + + /* Set hmac key to the prk, alg is set to reusable */ + IF_BC_FAIL(_bcCreateHmac(&ctx, prk)) goto Exit; + + /* Compute T(N) = HMAC(prk, T(n-1) | info | n) */ + for (counter = 1; okmOffset < okm->size; counter++) + { + IF_BC_FAIL(_bcHashDataRaw(&ctx, t, tLen)) goto Exit; + IF_BC_FAIL(_bcHashData(&ctx, info)) goto Exit; + IF_BC_FAIL(_bcHashDataRaw(&ctx, &counter, sizeof(counter))) goto Exit; + + /* Write current hash state to t buffer */ + IF_BC_FAIL(_bcFinishHash(&ctx, t)) goto Exit; + + /* Set the length of the current hash state */ + tLen = _BC_MIN(okm->size - okmOffset, SHA256_DIGEST_SIZE); + + DEBUG_ASSERT(tLen <= sizeof(t)); + + /* write the T buffer back to okm */ + ncWriteSpanS(okm, okmOffset, t, tLen); + + /* shift base okm pointer by T */ + okmOffset += tLen; + } + + result = CSTATUS_OK; /* HMAC operation completed, so set success */ + + Exit: + + _bcDestroyCtx(&ctx); + + return result; + } + +#endif /* !_IMPL_CRYPTO_SHA256_HKDF_EXPAND */ + +#endif /* _NC_IS_WINDOWS */
\ No newline at end of file diff --git a/src/crypto/impl/mbedtls.c b/src/crypto/impl/mbedtls.c new file mode 100644 index 0000000..ae36bbd --- /dev/null +++ b/src/crypto/impl/mbedtls.c @@ -0,0 +1,170 @@ +/* +* Copyright (c) 2024 Vaughn Nugent +* +* Package: noscrypt +* File: mbedtls.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/. +*/ + + +/* +* This file contains implemntation functions for the required +* cryptography primitives of noscrypt. This file stubs functionality +* using the Mbed-TLS library, if the builder desires to link against +* it. +*/ + +#ifdef MBEDTLS_CRYPTO_LIB + +#include <mbedtls/md.h> +#include <mbedtls/hkdf.h> +#include <mbedtls/hmac_drbg.h> +#include <mbedtls/sha256.h> +#include <mbedtls/chacha20.h> +#include <mbedtls/constant_time.h> + +#include "nc-util.h" + +/* +* EXPORT SUPPORTED FUNCTION OVERRIDES +*/ + +_IMPLSTB const mbedtls_md_info_t* _mbed_sha256_alg(void) +{ + const mbedtls_md_info_t* info; + /* Get sha256 md info for hdkf operations */ + info = mbedtls_md_info_from_type(MBEDTLS_MD_SHA256); + DEBUG_ASSERT2(info != NULL, "Expected SHA256 md info pointer to be valid") + return info; +} + +#if SIZE_MAX < UINT64_MAX + #define _ssize_guard(x) if(x > SIZE_MAX) return CSTATUS_FAIL; + #define _ssize_guard_int(x) if(x > SIZE_MAX) return 1; +#else + #define _ssize_guard(x) + #define _ssize_guard_int(x) +#endif + +#ifndef _IMPL_CHACHA20_CRYPT + + /* Export chacha20 computation */ + #define _IMPL_CHACHA20_CRYPT _mbed_chacha20_encrypt + + _IMPLSTB cstatus_t _mbed_chacha20_encrypt( + const uint8_t* key, + const uint8_t* nonce, + const uint8_t* input, + uint8_t* output, + uint32_t dataLen + ) + { + _ssize_guard(dataLen) + + /* Counter always starts at 0 */ + return mbedtls_chacha20_crypt( + key, + nonce, + 0x00u, /* nip-44 counter version */ + dataLen, + input, + output + ) == 0 ? CSTATUS_OK : CSTATUS_FAIL; + } + +#endif + +/* Export sha256 if not already defined */ +#ifndef _IMPL_CRYPTO_SHA256_DIGEST + + #define _IMPL_CRYPTO_SHA256_DIGEST _mbed_sha256_digest + + _IMPLSTB cstatus_t _mbed_sha256_digest(const cspan_t* data, sha256_t digestOut32) + { + _ssize_guard(data->size) + + return mbedtls_sha256( + data->data, + data->size, + digestOut32, + 0 /* Set 0 for sha256 mode */ + ) == 0 ? CSTATUS_OK : CSTATUS_FAIL; + } + +#endif + +/* Export Sha256 hmac if not already defined by other libs */ +#ifndef _IMPL_CRYPTO_SHA256_HMAC + + #define _IMPL_CRYPTO_SHA256_HMAC _mbed_sha256_hmac + + _IMPLSTB cstatus_t _mbed_sha256_hmac(const cspan_t* key, const cspan_t* data, sha256_t hmacOut32) + { + _ssize_guard(data->size) + + /* Keys should never be large enough for this to matter, but sanity check. */ + DEBUG_ASSERT2(key->size < SIZE_MAX, "Expected key size to be less than SIZE_MAX") + + return mbedtls_md_hmac( + _mbed_sha256_alg(), + key->data, + key->size, + data->data, + data->size, + hmacOut32 + ) == 0 ? CSTATUS_OK : CSTATUS_FAIL; + } +#endif + +/* Export hkdf expand if not already defined */ +#ifndef _IMPL_CRYPTO_SHA256_HKDF_EXPAND + + #define _IMPL_CRYPTO_SHA256_HKDF_EXPAND _mbed_sha256_hkdf_expand + + _IMPLSTB cstatus_t _mbed_sha256_hkdf_expand(const cspan_t* prk, const cspan_t* info, span_t* okm) + { + /* These sizes should never be large enough to overflow on <64bit platforms, but sanity check */ + DEBUG_ASSERT(okm->size < SIZE_MAX) + DEBUG_ASSERT(prk->size < SIZE_MAX) + DEBUG_ASSERT(info->size < SIZE_MAX) + + return mbedtls_hkdf_expand( + _mbed_sha256_alg(), + prk->data, + prk->size, + info->data, + info->size, + okm->data, + okm->size + ) == 0 ? CSTATUS_OK : CSTATUS_FAIL; + } + +#endif + +/* Export fixed-time compare if not already defined */ +#ifndef _IMPL_CRYPTO_FIXED_TIME_COMPARE + + #define _IMPL_CRYPTO_FIXED_TIME_COMPARE _mbed_fixed_time_compare + + /* fixed-time memcmp */ + _IMPLSTB uint32_t _mbed_fixed_time_compare(const uint8_t* a, const uint8_t* b, uint32_t size) + { + _ssize_guard_int(size) + + return (uint32_t)mbedtls_ct_memcmp(a, b, size); + } +#endif + +#endif
\ No newline at end of file diff --git a/src/crypto/impl/monocypher.c b/src/crypto/impl/monocypher.c new file mode 100644 index 0000000..790f5e9 --- /dev/null +++ b/src/crypto/impl/monocypher.c @@ -0,0 +1,83 @@ +/* +* Copyright (c) 2024 Vaughn Nugent +* +* Package: noscrypt +* File: impl/monocypher.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/. +*/ + + +/* +* This file handles some fallbacks that may not be available on +* some platforms. More specifically: +* - Secure memset 0 +* - Chacha20 cipher +* +*/ + +#ifdef NC_ENABLE_MONOCYPHER + +#include <monocypher.h> + +#include "nc-util.h" + +/* Export secure memse0 */ +#ifndef _IMPL_SECURE_ZERO_MEMSET + + /* export cytpo wipe function as is */ + #define _IMPL_SECURE_ZERO_MEMSET crypto_wipe +#endif + +/* Export Chacha20 */ +#ifndef _IMPL_CHACHA20_CRYPT + + #define _IMPL_CHACHA20_CRYPT _mc_chacha20_crypt + + _IMPLSTB cstatus_t _mc_chacha20_crypt( + const uint8_t* key, + const uint8_t* nonce, + const uint8_t* input, + uint8_t* output, + uint32_t dataLen + ) + { + if(dataLen > SIZE_MAX) + { + return CSTATUS_FAIL; + } + + /* + * Function returns the next counter value which is not + * needed for noscrypt as encryptions are one-shot, and + * require a new nonce for each encryption. + * + * ITEF function uses a 12byte nonce which is required for + * nip-44 compliant encryption. + */ + crypto_chacha20_ietf( + output, + input, + (size_t)dataLen, + key, + nonce, + 0x00 /* Counter always starts at 0 */ + ); + + return CSTATUS_OK; + } + +#endif + +#endif /* !NC_ENABLE_MONOCYPHER */
\ No newline at end of file diff --git a/src/crypto/impl/openssl.c b/src/crypto/impl/openssl.c new file mode 100644 index 0000000..1217e60 --- /dev/null +++ b/src/crypto/impl/openssl.c @@ -0,0 +1,46 @@ +/* +* Copyright (c) 2024 Vaughn Nugent +* +* Package: noscrypt +* File: impl/openssl.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/. +*/ + + +/* Setup openssl */ + +#ifdef OPENSSL_CRYPTO_LIB + +#include <openssl/sha.h> + +#include "nc-util.h" + +/* +* EXPORT SUPPORTED FUNCTIONS AS MACROS +*/ +#define _IMPL_CHACHA20_CRYPT _mbed_chacha20_encrypt +#define _IMPL_CRYPTO_SHA256_HMAC _mbed_sha256_hmac +#define _IMPL_CRYPTO_SHA256_DIGEST _ossl_sha256_digest +#define _IMPL_CRYPTO_FIXED_TIME_COMPARE _mbed_fixed_time_compare +#define _IMPL_CRYPTO_SHA256_HKDF_EXPAND _mbed_sha256_hkdf_expand +#define _IMPL_CRYPTO_SHA256_HKDF_EXTRACT _mbed_sha256_hkdf_extract + +_IMPLSTB int _ossl_sha256_digest(const uint8_t* data, uint8_t* digest) +{ + +} + + +#endif /*!OPENSSL_CRYPTO_LIB */
\ No newline at end of file diff --git a/src/crypto/nc-crypto.c b/src/crypto/nc-crypto.c new file mode 100644 index 0000000..fb2c0da --- /dev/null +++ b/src/crypto/nc-crypto.c @@ -0,0 +1,272 @@ +/* +* 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 beomes 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. +*/ + + + +/* +* 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 + #if defined(__GNUC__) + /* + * 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> + #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. +*/ + +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)" + */ + + 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); +} diff --git a/src/crypto/nc-crypto.h b/src/crypto/nc-crypto.h new file mode 100644 index 0000000..64d4ad8 --- /dev/null +++ b/src/crypto/nc-crypto.h @@ -0,0 +1,73 @@ + +/* +* Copyright (c) 2024 Vaughn Nugent +* +* Package: noscrypt +* File: nc-crypto.h +* +* 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/. +*/ + +#pragma once + +#ifndef _NC_CRYPTO_H +#define _NC_CRYPTO_H + +#include <stdint.h> + +#define CHACHA_NONCE_SIZE 0x0cu /* Size of 12 is set by the cipher spec */ +#define CHACHA_KEY_SIZE 0x20u /* Size of 32 is set by the cipher spec */ +#define SHA256_DIGEST_SIZE 0x20u /* Size of 32 is set by the cipher spec */ + +typedef uint8_t cstatus_t; +#define CSTATUS_OK ((cstatus_t)0x01u) +#define CSTATUS_FAIL ((cstatus_t)0x00u) + +typedef uint8_t sha256_t[SHA256_DIGEST_SIZE]; + +/* +* IMPORTANT: +* The HKDF_IN_BUF_SIZE defintion sets the internal stack buffer size to use +* during fallback HKDF_Expand operations. +* +* 128 bytes should be more than enough for most use cases, without going +* overboard. Could be dialed in better for specific use cases later. +*/ + +#ifndef HKDF_IN_BUF_SIZE + #define HKDF_IN_BUF_SIZE 0x80 +#endif + + +uint32_t ncCryptoFixedTimeComp(const uint8_t* a, const uint8_t* b, uint32_t size); + +void ncCryptoSecureZero(void* ptr, uint32_t size); + +cstatus_t ncCryptoDigestSha256(const cspan_t* data, sha256_t digestOut32); + +cstatus_t ncCryptoHmacSha256(const cspan_t* key, const cspan_t* data, sha256_t hmacOut32); + +cstatus_t ncCryptoSha256HkdfExpand(const cspan_t* prk, const cspan_t* info, span_t* okm); + +cstatus_t ncCryptoSha256HkdfExtract(const cspan_t* salt, const cspan_t* ikm, sha256_t 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 +); + +#endif /* !_NC_CRYPTO_H */ |