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-rw-r--r--src/internal/impl/bcrypt.c297
-rw-r--r--src/internal/impl/mbedtls.c158
-rw-r--r--src/internal/impl/monocypher.c84
-rw-r--r--src/internal/impl/openssl.c47
-rw-r--r--src/internal/nc-crypto.c269
-rw-r--r--src/internal/nc-crypto.h73
-rw-r--r--src/internal/nc-util.h28
-rw-r--r--src/noscrypt.c244
-rw-r--r--src/noscrypt.h22
9 files changed, 1085 insertions, 137 deletions
diff --git a/src/internal/impl/bcrypt.c b/src/internal/impl/bcrypt.c
new file mode 100644
index 0000000..8ae6c5a
--- /dev/null
+++ b/src/internal/impl/bcrypt.c
@@ -0,0 +1,297 @@
+/*
+* 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 "../../platform.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, uint64_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 _fallbackHkdfExpand
+
+ /* Include string for memmove */
+ #include <string.h>
+
+ static void ncWriteSpanS(span_t* span, uint64_t offset, const uint8_t* data, uint64_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 _fallbackHkdfExpand(const cspan_t* prk, const cspan_t* info, span_t* okm)
+ {
+ cstatus_t result;
+ struct _bcrypt_ctx ctx;
+
+ uint8_t counter;
+ uint64_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));
+ DEBUG_ASSERT((tLen + okmOffset) < okm->size);
+
+ /* 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/internal/impl/mbedtls.c b/src/internal/impl/mbedtls.c
new file mode 100644
index 0000000..54caa44
--- /dev/null
+++ b/src/internal/impl/mbedtls.c
@@ -0,0 +1,158 @@
+/*
+* 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 "../../platform.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;
+}
+
+#ifndef _IMPL_CHACHA20_CRYPT
+
+ /* Export chacha20 computation */
+ #define _IMPL_CHACHA20_CRYPT _mbed_chacha20_encrypt
+
+ _IMPLSTB int _mbed_chacha20_encrypt(
+ const uint8_t* key,
+ const uint8_t* nonce,
+ const uint8_t* input,
+ uint8_t* output,
+ size_t dataLen
+ )
+ {
+ /* Counter always starts at 0 */
+ return mbedtls_chacha20_crypt(key, nonce, 0x00u, dataLen, input, output);
+ }
+
+#endif
+
+/* Export sha256 if not already defined */
+#ifndef _IMPL_CRYPTO_SHA256_DIGEST
+
+ #define _IMPL_CRYPTO_SHA256_DIGEST _mbed_sha256_digest
+
+ _IMPLSTB CStatus _mbed_sha256_digest(const uint8_t* data, size_t dataSize,uint8_t* digestOut32)
+ {
+ return mbedtls_sha256(data, dataSize, digestOut32, 0);
+ }
+
+#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 _mbed_sha256_hmac(
+ const uint8_t* key, size_t keyLen,
+ const uint8_t* data, size_t dataLen,
+ void* hmacOut32
+ )
+ {
+ return mbedtls_md_hmac(
+ _mbed_sha256_alg(),
+ key, keyLen,
+ data, dataLen,
+ hmacOut32
+ );
+ }
+#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 int _mbed_sha256_hkdf_expand(
+ const uint8_t* prk, size_t prkLen,
+ const uint8_t* info, size_t infoLen,
+ void* okm, size_t okmLen
+ )
+ {
+ return mbedtls_hkdf_expand(
+ _mbed_sha256_alg(),
+ prk, prkLen,
+ info, infoLen,
+ okm, okmLen
+ );
+ }
+
+#endif
+
+/* Export hkdf extract if not already defined */
+#ifndef _IMPL_CRYPTO_SHA256_HKDF_EXTRACT
+
+ #define _IMPL_CRYPTO_SHA256_HKDF_EXTRACT _mbed_sha256_hkdf_extract
+
+ _IMPLSTB int _mbed_sha256_hkdf_extract(
+ const uint8_t* salt, size_t saltLen,
+ const uint8_t* ikm, size_t ikmLen,
+ void* prk
+ )
+ {
+ return mbedtls_hkdf_extract(
+ _mbed_sha256_alg(),
+ salt, saltLen,
+ ikm, ikmLen,
+ prk
+ );
+ }
+#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 int _mbed_fixed_time_compare(const uint8_t* a, const uint8_t* b, size_t size)
+ {
+ return mbedtls_ct_memcmp(a, b, size);
+ }
+#endif
+
+#endif \ No newline at end of file
diff --git a/src/internal/impl/monocypher.c b/src/internal/impl/monocypher.c
new file mode 100644
index 0000000..6e93c63
--- /dev/null
+++ b/src/internal/impl/monocypher.c
@@ -0,0 +1,84 @@
+/*
+* 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 "../../platform.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,
+ uint64_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/internal/impl/openssl.c b/src/internal/impl/openssl.c
new file mode 100644
index 0000000..d0cdb8c
--- /dev/null
+++ b/src/internal/impl/openssl.c
@@ -0,0 +1,47 @@
+/*
+* 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 "../../platform.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/internal/nc-crypto.c b/src/internal/nc-crypto.c
new file mode 100644
index 0000000..9cd2c3e
--- /dev/null
+++ b/src/internal/nc-crypto.c
@@ -0,0 +1,269 @@
+/*
+* 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"
+#include "../platform.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, uint64_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, uint64_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, uint64_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 > (uint64_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,
+ uint64_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")
+
+ return _IMPL_CHACHA20_CRYPT(key, nonce, input, output, dataSize);
+}
diff --git a/src/internal/nc-crypto.h b/src/internal/nc-crypto.h
new file mode 100644
index 0000000..3487b2b
--- /dev/null
+++ b/src/internal/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, uint64_t size);
+
+void ncCryptoSecureZero(void* ptr, uint64_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,
+ uint64_t dataSize
+);
+
+#endif /* !_NC_CRYPTO_H */
diff --git a/src/internal/nc-util.h b/src/internal/nc-util.h
index 9026d29..9f72470 100644
--- a/src/internal/nc-util.h
+++ b/src/internal/nc-util.h
@@ -3,7 +3,7 @@
* Copyright (c) 2024 Vaughn Nugent
*
* Package: noscrypt
-* File: nc-util.c
+* File: nc-util.h
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
@@ -59,4 +59,30 @@
#define STATIC_ASSERT(x, m)
#endif
+#include <stdint.h>
+
+typedef struct memory_span_struct
+{
+ uint8_t* data;
+ uint64_t size;
+} span_t;
+
+typedef struct read_only_memory_span_struct
+{
+ const uint8_t* data;
+ uint64_t size;
+} cspan_t;
+
+static void ncSpanInitC(cspan_t* span, const uint8_t* data, uint64_t size)
+{
+ span->data = data;
+ span->size = size;
+}
+
+static void ncSpanInit(span_t* span, uint8_t* data, uint64_t size)
+{
+ span->data = data;
+ span->size = size;
+}
+
#endif /* NC_UTIL_H */ \ No newline at end of file
diff --git a/src/noscrypt.c b/src/noscrypt.c
index 9271353..4715d50 100644
--- a/src/noscrypt.c
+++ b/src/noscrypt.c
@@ -43,6 +43,7 @@
#define CHECK_INVALID_ARG(x, argPos) if(x == NULL) return NCResultWithArgPosition(E_INVALID_ARG, argPos);
#define CHECK_NULL_ARG(x, argPos) if(x == NULL) return NCResultWithArgPosition(E_NULL_PTR, argPos);
#define CHECK_ARG_RANGE(x, min, max, argPos) if(x < min || x > max) return NCResultWithArgPosition(E_ARGUMENT_OUT_OF_RANGE, argPos);
+ #define CHECK_CONTEXT_STATE(ctx, argPos) CHECK_INVALID_ARG(ctx->secpCtx, argPos)
#else
/* empty macros */
#define CHECK_INVALID_ARG(x)
@@ -79,6 +80,7 @@ struct nc_expand_keys {
uint8_t hmac_key[NC_HMAC_KEY_SIZE];
};
+
/* Pointer typecast must work between expanded keys
* and message key, size must be identical to work
*/
@@ -126,7 +128,11 @@ static int _convertToPubKey(const NCContext* ctx, const NCPublicKey* compressedP
return result;
}
-static _nc_fn_inline int _convertFromXonly(const NCContext* ctx, const secp256k1_xonly_pubkey* xonly, NCPublicKey* compressedPubKey)
+static _nc_fn_inline int _convertFromXonly(
+ const NCContext* ctx,
+ const secp256k1_xonly_pubkey* xonly,
+ NCPublicKey* compressedPubKey
+)
{
DEBUG_ASSERT2(ctx != NULL, "Expected valid context")
DEBUG_ASSERT2(xonly != NULL, "Expected valid X-only secp256k1 public key structure.")
@@ -214,23 +220,16 @@ static _nc_fn_inline NCResult _computeConversationKey(
struct conversation_key* ck
)
{
- int opResult;
+ cspan_t saltSpan, ikmSpan;
DEBUG_ASSERT2(ctx != NULL, "Expected valid context")
DEBUG_ASSERT2(sharedSecret != NULL, "Expected a valid shared-point")
DEBUG_ASSERT2(ck != NULL, "Expected a valid conversation key")
-
- /* Derive the encryption key */
- opResult = ncCryptoSha256HkdfExtract(
- Nip44ConstantSalt,
- sizeof(Nip44ConstantSalt),
- (uint8_t*)sharedSecret, /* Shared secret is the input key */
- NC_SHARED_SEC_SIZE,
- (uint8_t*)ck /* Output produces a conversation key */
- );
- /* 0 is a successful hdkf result */
- return opResult == 0 ? NC_SUCCESS : E_OPERATION_FAILED;
+ ncSpanInitC(&saltSpan, Nip44ConstantSalt, sizeof(Nip44ConstantSalt));
+ ncSpanInitC(&ikmSpan, sharedSecret->value, NC_SHARED_SEC_SIZE);
+
+ return ncCryptoSha256HkdfExtract(&saltSpan, &ikmSpan, ck->value) == CSTATUS_OK ? NC_SUCCESS : E_OPERATION_FAILED;
}
@@ -242,7 +241,7 @@ static _nc_fn_inline const struct nc_expand_keys* _expandKeysFromHkdf(const stru
return (const struct nc_expand_keys*)hkdf;
}
-static int _chachaEncipher(const struct nc_expand_keys* keys, NCEncryptionArgs* args)
+static cstatus_t _chachaEncipher(const struct nc_expand_keys* keys, NCEncryptionArgs* args)
{
DEBUG_ASSERT2(keys != NULL, "Expected valid keys")
DEBUG_ASSERT2(args != NULL, "Expected valid encryption args")
@@ -256,61 +255,65 @@ static int _chachaEncipher(const struct nc_expand_keys* keys, NCEncryptionArgs*
);
}
-static _nc_fn_inline NCResult _getMessageKey(
+static _nc_fn_inline cstatus_t _getMessageKey(
const struct conversation_key* converstationKey,
- const uint8_t* nonce,
- size_t nonceSize,
+ const cspan_t* nonce,
struct message_key* messageKey
)
{
- int result;
+ cspan_t prkSpan;
+ span_t okmSpan;
+
DEBUG_ASSERT2(nonce != NULL, "Expected valid nonce buffer")
DEBUG_ASSERT2(converstationKey != NULL, "Expected valid conversation key")
DEBUG_ASSERT2(messageKey != NULL, "Expected valid message key buffer")
- /* Another HKDF to derive the message key with nonce */
- result = ncCryptoSha256HkdfExpand(
- (uint8_t*)converstationKey, /* Conversation key is the input key */
- NC_CONV_KEY_SIZE,
- nonce,
- nonceSize,
- (uint8_t*)messageKey, /* Output produces a message key (write it directly to struct memory) */
- NC_MESSAGE_KEY_SIZE
- );
-
- return result == 0 ? NC_SUCCESS : E_OPERATION_FAILED;
+ ncSpanInitC(&prkSpan, converstationKey->value, sizeof(struct conversation_key)); /* Conversation key is the input key */
+ ncSpanInit(&okmSpan, messageKey->value, sizeof(struct message_key)); /* Output produces a message key (write it directly to struct memory) */
+
+ /* Nonce is the info */
+ return ncCryptoSha256HkdfExpand(&prkSpan, nonce, &okmSpan);
}
static _nc_fn_inline NCResult _encryptEx(
const NCContext* ctx,
const struct conversation_key* ck,
- uint8_t hmacKey[NC_HMAC_KEY_SIZE],
+ uint8_t* hmacKey,
NCEncryptionArgs* args
)
{
NCResult result;
+ cspan_t nonceSpan;
struct message_key messageKey;
const struct nc_expand_keys* expandedKeys;
- DEBUG_ASSERT2(ctx != NULL, "Expected valid context")
- DEBUG_ASSERT2(ck != NULL, "Expected valid conversation key")
- DEBUG_ASSERT2(args != NULL, "Expected valid encryption args")
- DEBUG_ASSERT2(hmacKey != NULL, "Expected valid hmac key buffer")
+ DEBUG_ASSERT2(ctx != NULL, "Expected valid context")
+ DEBUG_ASSERT2(ck != NULL, "Expected valid conversation key")
+ DEBUG_ASSERT2(args != NULL, "Expected valid encryption args")
+ DEBUG_ASSERT2(hmacKey != NULL, "Expected valid hmac key buffer")
+
+ result = NC_SUCCESS;
+
+ ncSpanInitC(&nonceSpan, args->nonce32, NC_ENCRYPTION_NONCE_SIZE);
/* Message key will be derrived on every encryption call */
- if ((result = _getMessageKey(ck, args->nonce32, NC_ENCRYPTION_NONCE_SIZE, &messageKey)) != NC_SUCCESS)
+ if (_getMessageKey(ck, &nonceSpan, &messageKey) != CSTATUS_OK)
{
+ result = E_OPERATION_FAILED;
goto Cleanup;
}
- /* Expand the keys from the hkdf so we can use them in the cipher */
+ /* Split apart the message key into it's expanded form so components can be extracted */
expandedKeys = _expandKeysFromHkdf(&messageKey);
/* Copy the hmac key into the args */
MEMMOV(hmacKey, expandedKeys->hmac_key, NC_HMAC_KEY_SIZE);
/* CHACHA20 (the result will be 0 on success) */
- result = (NCResult)_chachaEncipher(expandedKeys, args);
+ if (_chachaEncipher(expandedKeys, args) != CSTATUS_OK)
+ {
+ result = E_OPERATION_FAILED;
+ }
Cleanup:
ZERO_FILL(&messageKey, sizeof(messageKey));
@@ -318,22 +321,24 @@ Cleanup:
return result;
}
-static _nc_fn_inline NCResult _decryptEx(
- const NCContext* ctx,
- const struct conversation_key* ck,
- NCEncryptionArgs* args
-)
+static _nc_fn_inline NCResult _decryptEx(const NCContext* ctx, const struct conversation_key* ck, NCEncryptionArgs* args)
{
NCResult result;
+ cspan_t nonceSpan;
struct message_key messageKey;
const struct nc_expand_keys* cipherKeys;
DEBUG_ASSERT2(ctx != NULL, "Expected valid context")
DEBUG_ASSERT2(ck != NULL, "Expected valid conversation key")
DEBUG_ASSERT2(args != NULL, "Expected valid encryption args")
+
+ result = NC_SUCCESS;
+
+ ncSpanInitC(&nonceSpan, args->nonce32, NC_ENCRYPTION_NONCE_SIZE);
- if ((result = _getMessageKey(ck, args->nonce32, NC_ENCRYPTION_NONCE_SIZE, &messageKey)) != NC_SUCCESS)
+ if (_getMessageKey(ck, &nonceSpan, &messageKey) != CSTATUS_OK)
{
+ result = E_OPERATION_FAILED;
goto Cleanup;
}
@@ -341,7 +346,10 @@ static _nc_fn_inline NCResult _decryptEx(
cipherKeys = _expandKeysFromHkdf(&messageKey);
/* CHACHA20 (the result will be 0 on success) */
- result = (NCResult) _chachaEncipher(cipherKeys, args);
+ if (_chachaEncipher(cipherKeys, args) != CSTATUS_OK)
+ {
+ result = E_OPERATION_FAILED;
+ }
Cleanup:
ZERO_FILL(&messageKey, sizeof(messageKey));
@@ -349,22 +357,17 @@ Cleanup:
return result;
}
-static _nc_fn_inline int _computeHmac(
- const uint8_t key[NC_HMAC_KEY_SIZE],
- const NCMacVerifyArgs* args,
- uint8_t hmacOut[NC_ENCRYPTION_MAC_SIZE]
-)
+static _nc_fn_inline cstatus_t _computeHmac(const uint8_t key[NC_HMAC_KEY_SIZE], const cspan_t* payload, sha256_t hmacOut)
{
- DEBUG_ASSERT2(key != NULL, "Expected valid hmac key")
- DEBUG_ASSERT2(args != NULL, "Expected valid mac verification args")
- DEBUG_ASSERT2(hmacOut != NULL, "Expected valid hmac output buffer")
- DEBUG_ASSERT(args->payload != NULL)
+ cspan_t keySpan;
- return ncCryptoHmacSha256(
- key, NC_HMAC_KEY_SIZE,
- args->payload, args->payloadSize,
- hmacOut
- );
+ DEBUG_ASSERT2(key != NULL, "Expected valid hmac key")
+ DEBUG_ASSERT2(payload != NULL, "Expected valid mac verification args")
+ DEBUG_ASSERT2(hmacOut != NULL, "Expected valid hmac output buffer")
+
+ ncSpanInitC(&keySpan, key, NC_HMAC_KEY_SIZE);
+
+ return ncCryptoHmacSha256(&keySpan, payload, hmacOut);
}
static NCResult _verifyMacEx(
@@ -374,26 +377,25 @@ static NCResult _verifyMacEx(
)
{
NCResult result;
+ cspan_t payloadSpan, nonceSpan;
+ sha256_t hmacOut;
const struct nc_expand_keys* keys;
struct message_key messageKey;
- uint8_t hmacOut[NC_ENCRYPTION_MAC_SIZE];
DEBUG_ASSERT2(ctx != NULL, "Expected valid context")
DEBUG_ASSERT2(conversationKey != NULL, "Expected valid conversation key")
DEBUG_ASSERT2(args != NULL, "Expected valid mac verification args")
+ ncSpanInitC(&nonceSpan, args->nonce32, NC_ENCRYPTION_NONCE_SIZE);
+ ncSpanInitC(&payloadSpan, args->payload, args->payloadSize);
+
/*
* Message key is again required for the hmac verification
*/
- result = _getMessageKey(
- (struct conversation_key*)conversationKey,
- args->nonce32,
- NC_ENCRYPTION_NONCE_SIZE,
- &messageKey
- );
- if (result != NC_SUCCESS)
+ if (_getMessageKey((struct conversation_key*)conversationKey, &nonceSpan, &messageKey) != CSTATUS_OK)
{
+ result = E_OPERATION_FAILED;
goto Cleanup;
}
@@ -403,7 +405,7 @@ static NCResult _verifyMacEx(
/*
* Compute the hmac of the data using the computed hmac key
*/
- if (_computeHmac(keys->hmac_key, args, hmacOut) != 0)
+ if (_computeHmac(keys->hmac_key, &payloadSpan, hmacOut) != CSTATUS_OK)
{
result = E_OPERATION_FAILED;
goto Cleanup;
@@ -419,7 +421,6 @@ Cleanup:
return result;
}
-
/*
* EXTERNAL API FUNCTIONS
*/
@@ -452,7 +453,7 @@ NC_EXPORT NCResult NC_CC NCReInitContext(
{
CHECK_NULL_ARG(ctx, 0)
CHECK_NULL_ARG(entropy, 1)
- CHECK_INVALID_ARG(ctx->secpCtx, 0)
+ CHECK_CONTEXT_STATE(ctx, 0)
/* Only randomize again */
return secp256k1_context_randomize(ctx->secpCtx, entropy) ? NC_SUCCESS : E_INVALID_ARG;
@@ -460,8 +461,8 @@ NC_EXPORT NCResult NC_CC NCReInitContext(
NC_EXPORT NCResult NC_CC NCDestroyContext(NCContext* ctx)
{
- CHECK_NULL_ARG(ctx, 0);
- CHECK_INVALID_ARG(ctx->secpCtx, 0);
+ CHECK_NULL_ARG(ctx, 0)
+ CHECK_CONTEXT_STATE(ctx, 0)
/* Destroy secp256k1 context */
secp256k1_context_destroy(ctx->secpCtx);
@@ -484,7 +485,7 @@ NC_EXPORT NCResult NC_CC NCGetPublicKey(
secp256k1_xonly_pubkey xonly;
CHECK_NULL_ARG(ctx, 0)
- CHECK_INVALID_ARG(ctx->secpCtx, 0)
+ CHECK_CONTEXT_STATE(ctx, 0)
CHECK_NULL_ARG(sk, 1)
CHECK_NULL_ARG(pk, 2)
@@ -508,14 +509,11 @@ NC_EXPORT NCResult NC_CC NCGetPublicKey(
return NC_SUCCESS;
}
-NC_EXPORT NCResult NC_CC NCValidateSecretKey(
- const NCContext* ctx,
- const NCSecretKey* sk
-)
+NC_EXPORT NCResult NC_CC NCValidateSecretKey(const NCContext* ctx, const NCSecretKey* sk)
{
CHECK_NULL_ARG(ctx, 0)
CHECK_NULL_ARG(sk, 1)
- CHECK_INVALID_ARG(ctx->secpCtx, 0)
+ CHECK_CONTEXT_STATE(ctx, 0)
/* Validate the secret key */
return secp256k1_ec_seckey_verify(ctx->secpCtx, sk->key);
@@ -537,7 +535,7 @@ NC_EXPORT NCResult NC_CC NCSignDigest(
/* Validate arguments */
CHECK_NULL_ARG(ctx, 0)
- CHECK_INVALID_ARG(ctx->secpCtx, 0)
+ CHECK_CONTEXT_STATE(ctx, 0)
CHECK_NULL_ARG(sk, 1)
CHECK_NULL_ARG(random32, 2)
CHECK_NULL_ARG(digest32, 3)
@@ -571,11 +569,12 @@ NC_EXPORT NCResult NC_CC NCSignData(
const NCSecretKey* sk,
const uint8_t random32[32],
const uint8_t* data,
- size_t dataSize,
+ uint64_t dataSize,
uint8_t sig64[64]
)
{
- uint8_t digest[SHA256_DIGEST_SIZE];
+ cspan_t dataSpan;
+ sha256_t digest;
/* Double check is required because arg position differs */
CHECK_NULL_ARG(ctx, 0)
@@ -585,8 +584,10 @@ NC_EXPORT NCResult NC_CC NCSignData(
CHECK_ARG_RANGE(dataSize, 1, UINT32_MAX, 4)
CHECK_NULL_ARG(sig64, 5)
+ ncSpanInitC(&dataSpan, data, dataSize);
+
/* Compute sha256 of the data before signing */
- if(ncCryptoDigestSha256(data, dataSize, digest) != 0)
+ if(ncCryptoDigestSha256(&dataSpan, digest) != CSTATUS_OK)
{
return E_INVALID_ARG;
}
@@ -606,7 +607,7 @@ NC_EXPORT NCResult NC_CC NCVerifyDigest(
secp256k1_xonly_pubkey xonly;
CHECK_NULL_ARG(ctx, 0)
- CHECK_INVALID_ARG(ctx->secpCtx, 0)
+ CHECK_CONTEXT_STATE(ctx, 0)
CHECK_NULL_ARG(pk, 1)
CHECK_NULL_ARG(digest32, 2)
CHECK_NULL_ARG(sig64, 3)
@@ -629,11 +630,12 @@ NC_EXPORT NCResult NC_CC NCVerifyData(
const NCContext* ctx,
const NCPublicKey* pk,
const uint8_t* data,
- const size_t dataSize,
+ const uint64_t dataSize,
const uint8_t sig64[64]
)
{
- uint8_t digest[SHA256_DIGEST_SIZE];
+ sha256_t digest;
+ cspan_t dataSpan;
CHECK_NULL_ARG(ctx, 0)
CHECK_NULL_ARG(pk, 1)
@@ -641,8 +643,10 @@ NC_EXPORT NCResult NC_CC NCVerifyData(
CHECK_ARG_RANGE(dataSize, 1, UINT32_MAX, 3)
CHECK_NULL_ARG(sig64, 4)
+ ncSpanInitC(&dataSpan, data, dataSize);
+
/* Compute sha256 of the data before verifying */
- if (ncCryptoDigestSha256(data, dataSize, digest) != 0)
+ if (ncCryptoDigestSha256(&dataSpan, digest) != CSTATUS_OK)
{
return E_INVALID_ARG;
}
@@ -661,7 +665,7 @@ NC_EXPORT NCResult NC_CC NCGetSharedSecret(
)
{
CHECK_NULL_ARG(ctx, 0)
- CHECK_INVALID_ARG(ctx->secpCtx, 0)
+ CHECK_CONTEXT_STATE(ctx, 0)
CHECK_NULL_ARG(sk, 1)
CHECK_NULL_ARG(otherPk, 2)
CHECK_NULL_ARG(sharedPoint, 3)
@@ -676,7 +680,7 @@ NC_EXPORT NCResult NC_CC NCGetConversationKeyEx(
)
{
CHECK_NULL_ARG(ctx, 0)
- CHECK_INVALID_ARG(ctx->secpCtx, 0)
+ CHECK_CONTEXT_STATE(ctx, 0)
CHECK_NULL_ARG(sharedPoint, 1)
CHECK_NULL_ARG(conversationKey, 2)
@@ -699,7 +703,7 @@ NC_EXPORT NCResult NC_CC NCGetConversationKey(
struct shared_secret sharedSecret;
CHECK_NULL_ARG(ctx, 0)
- CHECK_INVALID_ARG(ctx->secpCtx, 0)
+ CHECK_CONTEXT_STATE(ctx, 0)
CHECK_NULL_ARG(sk, 1)
CHECK_NULL_ARG(pk, 2)
CHECK_NULL_ARG(conversationKey, 3)
@@ -722,35 +726,28 @@ Cleanup:
NC_EXPORT NCResult NC_CC NCEncryptEx(
const NCContext* ctx,
const uint8_t conversationKey[NC_CONV_KEY_SIZE],
- uint8_t hmacKeyOut[NC_HMAC_KEY_SIZE],
NCEncryptionArgs* args
)
{
CHECK_NULL_ARG(ctx, 0)
- CHECK_INVALID_ARG(ctx->secpCtx, 0)
+ CHECK_CONTEXT_STATE(ctx, 0)
CHECK_NULL_ARG(conversationKey, 1)
- CHECK_NULL_ARG(hmacKeyOut, 2)
- CHECK_NULL_ARG(args, 3)
+ CHECK_NULL_ARG(args, 2)
/* Validte ciphertext/plaintext */
- CHECK_INVALID_ARG(args->inputData, 3)
- CHECK_INVALID_ARG(args->outputData, 3)
- CHECK_INVALID_ARG(args->nonce32, 3)
- CHECK_ARG_RANGE(args->dataSize, NIP44_MIN_ENC_MESSAGE_SIZE, NIP44_MAX_ENC_MESSAGE_SIZE, 3)
+ CHECK_INVALID_ARG(args->inputData, 2)
+ CHECK_INVALID_ARG(args->outputData, 2)
+ CHECK_INVALID_ARG(args->nonce32, 2)
+ CHECK_INVALID_ARG(args->hmacKeyOut32, 2)
+ CHECK_ARG_RANGE(args->dataSize, NIP44_MIN_ENC_MESSAGE_SIZE, NIP44_MAX_ENC_MESSAGE_SIZE, 2)
- return _encryptEx(
- ctx,
- (struct conversation_key*)conversationKey,
- hmacKeyOut,
- args
- );
+ return _encryptEx(ctx, (struct conversation_key*)conversationKey, args->hmacKeyOut32, args);
}
NC_EXPORT NCResult NC_CC NCEncrypt(
const NCContext* ctx,
const NCSecretKey* sk,
- const NCPublicKey* pk,
- uint8_t hmacKeyOut[NC_HMAC_KEY_SIZE],
+ const NCPublicKey* pk,
NCEncryptionArgs* args
)
{
@@ -759,17 +756,17 @@ NC_EXPORT NCResult NC_CC NCEncrypt(
struct conversation_key conversationKey;
CHECK_NULL_ARG(ctx, 0)
- CHECK_INVALID_ARG(ctx->secpCtx, 0)
+ CHECK_CONTEXT_STATE(ctx, 0)
CHECK_NULL_ARG(sk, 1)
CHECK_NULL_ARG(pk, 2)
- CHECK_NULL_ARG(hmacKeyOut, 3)
- CHECK_NULL_ARG(args, 4)
+ CHECK_NULL_ARG(args, 3)
/* Validate input/output data */
- CHECK_INVALID_ARG(args->inputData, 4)
- CHECK_INVALID_ARG(args->outputData, 4)
- CHECK_INVALID_ARG(args->nonce32, 4)
- CHECK_ARG_RANGE(args->dataSize, NIP44_MIN_ENC_MESSAGE_SIZE, NIP44_MAX_ENC_MESSAGE_SIZE, 4)
+ CHECK_INVALID_ARG(args->inputData, 3)
+ CHECK_INVALID_ARG(args->outputData, 3)
+ CHECK_INVALID_ARG(args->nonce32, 3)
+ CHECK_INVALID_ARG(args->hmacKeyOut32, 3)
+ CHECK_ARG_RANGE(args->dataSize, NIP44_MIN_ENC_MESSAGE_SIZE, NIP44_MAX_ENC_MESSAGE_SIZE, 3)
/* Compute the shared point */
if ((result = _computeSharedSecret(ctx, sk, pk, &sharedSecret)) != NC_SUCCESS)
@@ -783,7 +780,7 @@ NC_EXPORT NCResult NC_CC NCEncrypt(
goto Cleanup;
}
- result = _encryptEx(ctx, &conversationKey, hmacKeyOut, args);
+ result = _encryptEx(ctx, &conversationKey, args->hmacKeyOut32, args);
Cleanup:
/* Clean up sensitive data */
@@ -800,7 +797,7 @@ NC_EXPORT NCResult NC_CC NCDecryptEx(
)
{
CHECK_NULL_ARG(ctx, 0)
- CHECK_INVALID_ARG(ctx->secpCtx, 0)
+ CHECK_CONTEXT_STATE(ctx, 0)
CHECK_NULL_ARG(conversationKey, 1)
CHECK_NULL_ARG(args, 2)
@@ -825,7 +822,7 @@ NC_EXPORT NCResult NC_CC NCDecrypt(
struct conversation_key conversationKey;
CHECK_NULL_ARG(ctx, 0)
- CHECK_INVALID_ARG(ctx->secpCtx, 0)
+ CHECK_CONTEXT_STATE(ctx, 0)
CHECK_NULL_ARG(sk, 1)
CHECK_NULL_ARG(pk, 2)
CHECK_NULL_ARG(args, 3)
@@ -860,28 +857,25 @@ NC_EXPORT NCResult NCComputeMac(
const NCContext* ctx,
const uint8_t hmacKey[NC_HMAC_KEY_SIZE],
const uint8_t* payload,
- size_t payloadSize,
+ uint64_t payloadSize,
uint8_t hmacOut[NC_ENCRYPTION_MAC_SIZE]
)
{
- NCMacVerifyArgs args;
+ cspan_t payloadSpan;
CHECK_NULL_ARG(ctx, 0)
- CHECK_INVALID_ARG(ctx->secpCtx, 0)
+ CHECK_CONTEXT_STATE(ctx, 0)
CHECK_NULL_ARG(hmacKey, 1)
CHECK_NULL_ARG(payload, 2)
CHECK_ARG_RANGE(payloadSize, 1, UINT32_MAX, 3)
CHECK_NULL_ARG(hmacOut, 4)
- /*Fill args with 0 before use because we are only using some of the properties*/
- ZERO_FILL(&args, sizeof(args));
- args.payload = payload;
- args.payloadSize = payloadSize;
+ ncSpanInitC(&payloadSpan, payload, payloadSize);
/*
* Compute the hmac of the data using the supplied hmac key
*/
- return _computeHmac(hmacKey, &args, hmacOut) == 0 ? NC_SUCCESS : E_OPERATION_FAILED;
+ return _computeHmac(hmacKey, &payloadSpan, hmacOut) == CSTATUS_OK ? NC_SUCCESS : E_OPERATION_FAILED;
}
@@ -892,7 +886,7 @@ NC_EXPORT NCResult NC_CC NCVerifyMacEx(
)
{
CHECK_NULL_ARG(ctx, 0)
- CHECK_INVALID_ARG(ctx->secpCtx, 0)
+ CHECK_CONTEXT_STATE(ctx, 0)
CHECK_NULL_ARG(conversationKey, 1)
CHECK_NULL_ARG(args, 2)
@@ -912,7 +906,7 @@ NC_EXPORT NCResult NC_CC NCVerifyMac(
)
{
CHECK_NULL_ARG(ctx, 0)
- CHECK_INVALID_ARG(ctx->secpCtx, 0)
+ CHECK_CONTEXT_STATE(ctx, 0)
CHECK_NULL_ARG(sk, 1)
CHECK_NULL_ARG(pk, 2)
CHECK_NULL_ARG(args, 3)
@@ -937,7 +931,7 @@ NC_EXPORT NCResult NC_CC NCVerifyMac(
goto Cleanup;
}
- result = _verifyMacEx(ctx, (uint8_t*)&conversationKey, args);
+ result = _verifyMacEx(ctx, conversationKey.value, args);
Cleanup:
/* Clean up sensitive data */
diff --git a/src/noscrypt.h b/src/noscrypt.h
index 06746ce..a8a42ee 100644
--- a/src/noscrypt.h
+++ b/src/noscrypt.h
@@ -145,6 +145,10 @@ typedef struct nc_encryption_struct {
/* The nonce used for the stream cipher. */
const uint8_t* nonce32;
+ /* Writes the hmac key to the buffer during encryption events.
+ Set to NULL on decryption */
+ uint8_t* hmacKeyOut32;
+
/* The input data buffer to encrypt/decrypt */
const uint8_t* inputData;
@@ -154,7 +158,7 @@ typedef struct nc_encryption_struct {
/* The size of the data buffers. Buffers must
* be the same size or larger than this value
*/
- size_t dataSize;
+ uint64_t dataSize;
} NCEncryptionArgs;
@@ -174,7 +178,7 @@ typedef struct nc_mac_verify {
const uint8_t* payload;
/* The size of the payload data */
- size_t payloadSize;
+ uint64_t payloadSize;
} NCMacVerifyArgs;
@@ -217,10 +221,10 @@ that caused the error.
*/
static _nc_fn_inline int NCParseErrorCode(NCResult result, uint8_t* argPositionOut)
{
- /* convert result to a positive value*/
NCResult asPositive;
int code;
+ /* convert result to a positive value*/
asPositive = -result;
/* Get the error code from the lower 8 bits and the argument position from the upper 8 bits*/
@@ -315,7 +319,7 @@ NC_EXPORT NCResult NC_CC NCSignData(
const NCSecretKey* sk,
const uint8_t random32[32],
const uint8_t* data,
- const size_t dataSize,
+ const uint64_t dataSize,
uint8_t sig64[64]
);
@@ -332,7 +336,7 @@ NC_EXPORT NCResult NC_CC NCVerifyData(
const NCContext* ctx,
const NCPublicKey* pk,
const uint8_t* data,
- const size_t dataSize,
+ const uint64_t dataSize,
const uint8_t sig64[64]
);
@@ -396,15 +400,13 @@ the NCEncryptEx functions for extended encryption functionality
* @param sk The secret key (the local private key)
* @param pk The compressed public key (x-only serialized public key) the other user's public key
* @param args The encryption arguments
-* @param hmacKeyOut A pointer to the buffer to write the hmac key to
* @return NC_SUCCESS if the operation was successful, otherwise an error code. Use NCParseErrorCode to
the error code and positional argument that caused the error
*/
NC_EXPORT NCResult NC_CC NCEncrypt(
const NCContext* ctx,
const NCSecretKey* sk,
- const NCPublicKey* pk,
- uint8_t hmacKeyOut[NC_HMAC_KEY_SIZE],
+ const NCPublicKey* pk,
NCEncryptionArgs* args
);
@@ -500,14 +502,12 @@ NC_EXPORT NCResult NC_CC NCGetConversationKeyEx(
* @param ctx A pointer to the existing library context
* @param conversationKey A pointer to the conversation key
* @param args A pointer to the encryption arguments structure
-* @param hmacKeyOut A pointer to the buffer to write the hmac key to
* @return NC_SUCCESS if the operation was successful, otherwise an error code. Use NCParseErrorCode to
the error code and positional argument that caused the error.
*/
NC_EXPORT NCResult NC_CC NCEncryptEx(
const NCContext* ctx,
const uint8_t conversationKey[NC_CONV_KEY_SIZE],
- uint8_t hmacKeyOut[NC_HMAC_KEY_SIZE],
NCEncryptionArgs* args
);
@@ -555,7 +555,7 @@ NC_EXPORT NCResult NCComputeMac(
const NCContext* ctx,
const uint8_t hmacKey[NC_HMAC_KEY_SIZE],
const uint8_t* payload,
- size_t payloadSize,
+ uint64_t payloadSize,
uint8_t hmacOut[NC_ENCRYPTION_MAC_SIZE]
);
generated by cgit (git 2.46.0) at 2024-10-01 22:26:04 +0000