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-rw-r--r--src/crypto/impl/bcrypt.c86
-rw-r--r--src/crypto/impl/mbedtls.c20
-rw-r--r--src/crypto/impl/monocypher.c5
-rw-r--r--src/crypto/impl/openssl.c162
4 files changed, 186 insertions, 87 deletions
diff --git a/src/crypto/impl/bcrypt.c b/src/crypto/impl/bcrypt.c
index 970f68f..9b01cac 100644
--- a/src/crypto/impl/bcrypt.c
+++ b/src/crypto/impl/bcrypt.c
@@ -32,8 +32,10 @@
#include <bcrypt.h>
#include "nc-util.h"
+#include "hkdf.h"
-#define IF_BC_FAIL(x) if(!BCRYPT_SUCCESS(x))
+#define IF_BC_FAIL(x) if(!BCRYPT_SUCCESS(x))
+#define BC_FAIL(x) if(!BCRYPT_SUCCESS(x)) return CSTATUS_FAIL;
struct _bcrypt_ctx
{
@@ -68,8 +70,8 @@ _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
+ * I am not explicitly managing the update object buffer. By setting
+ * the update 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
@@ -113,7 +115,7 @@ _IMPLSTB NTSTATUS _bcFinishHash(const struct _bcrypt_ctx* ctx, sha256_t digestOu
_IMPLSTB void _bcDestroyCtx(struct _bcrypt_ctx* ctx)
{
- /* Free the hash memory if it was allocated */
+ /* Free the update memory if it was allocated */
if(ctx->hHash) BCryptDestroyHash(ctx->hHash);
/* Close the algorithm provider */
@@ -214,76 +216,42 @@ _IMPLSTB void _bcDestroyCtx(struct _bcrypt_ctx* ctx)
#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)
+ cstatus_t _bcrypt_hkdf_update(void* ctx, const cspan_t* data)
{
- 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")
+ DEBUG_ASSERT(ctx != NULL)
- /* Copy data to span */
- memmove(span->data + offset, data, size);
+ BC_FAIL(_bcHashData((struct _bcrypt_ctx*)ctx, data))
+ return CSTATUS_OK;
}
- 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
- */
+ cstatus_t _bcrypt_hkdf_finish(void* ctx, sha256_t hmacOut32)
+ {
+ DEBUG_ASSERT(ctx != NULL)
- #define _BC_MIN(a, b) (a < b ? a : b)
+ BC_FAIL(_bcFinishHash((struct _bcrypt_ctx*)ctx, hmacOut32))
+ return CSTATUS_OK;
+ }
_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;
+ struct nc_hkdf_fn_cb_struct handler;
- 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;
+ handler.update = _bcrypt_hkdf_update;
+ handler.finish = _bcrypt_hkdf_finish;
- /* Set the length of the current hash state */
- tLen = _BC_MIN(okm->size - okmOffset, SHA256_DIGEST_SIZE);
+ /* Init bcrypt */
+ BC_FAIL(_bcInitSha256(&ctx, BCRYPT_ALG_HANDLE_HMAC_FLAG))
- DEBUG_ASSERT(tLen <= sizeof(t));
+ BC_FAIL(_bcCreateHmac(&ctx, prk))
- /* write the T buffer back to okm */
- ncWriteSpanS(okm, okmOffset, t, tLen);
+ /*
+ * NOTE! Hmac reusable flag must be set to allow for multiple
+ * calls to the finish function without losing the context.
+ */
- /* shift base okm pointer by T */
- okmOffset += tLen;
- }
-
- result = CSTATUS_OK; /* HMAC operation completed, so set success */
-
- Exit:
+ result = hkdfExpandProcess(&handler, &ctx, info, okm);
_bcDestroyCtx(&ctx);
diff --git a/src/crypto/impl/mbedtls.c b/src/crypto/impl/mbedtls.c
index ae36bbd..18eb9db 100644
--- a/src/crypto/impl/mbedtls.c
+++ b/src/crypto/impl/mbedtls.c
@@ -28,6 +28,11 @@
#ifdef MBEDTLS_CRYPTO_LIB
+/* Inline errors on linux in header files on linux */
+#ifndef inline
+#define inline __inline
+#endif
+
#include <mbedtls/md.h>
#include <mbedtls/hkdf.h>
#include <mbedtls/hmac_drbg.h>
@@ -35,11 +40,10 @@
#include <mbedtls/chacha20.h>
#include <mbedtls/constant_time.h>
-#include "nc-util.h"
+#ifndef inline
+#undef inline
+#endif
-/*
-* EXPORT SUPPORTED FUNCTION OVERRIDES
-*/
_IMPLSTB const mbedtls_md_info_t* _mbed_sha256_alg(void)
{
@@ -51,10 +55,8 @@ _IMPLSTB const mbedtls_md_info_t* _mbed_sha256_alg(void)
}
#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
@@ -71,7 +73,7 @@ _IMPLSTB const mbedtls_md_info_t* _mbed_sha256_alg(void)
uint32_t dataLen
)
{
- _ssize_guard(dataLen)
+ _sizet_check(dataLen)
/* Counter always starts at 0 */
return mbedtls_chacha20_crypt(
@@ -93,7 +95,7 @@ _IMPLSTB const mbedtls_md_info_t* _mbed_sha256_alg(void)
_IMPLSTB cstatus_t _mbed_sha256_digest(const cspan_t* data, sha256_t digestOut32)
{
- _ssize_guard(data->size)
+ _sizet_check(data->size)
return mbedtls_sha256(
data->data,
@@ -112,7 +114,7 @@ _IMPLSTB const mbedtls_md_info_t* _mbed_sha256_alg(void)
_IMPLSTB cstatus_t _mbed_sha256_hmac(const cspan_t* key, const cspan_t* data, sha256_t hmacOut32)
{
- _ssize_guard(data->size)
+ _sizet_check(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")
diff --git a/src/crypto/impl/monocypher.c b/src/crypto/impl/monocypher.c
index 790f5e9..b695d08 100644
--- a/src/crypto/impl/monocypher.c
+++ b/src/crypto/impl/monocypher.c
@@ -53,10 +53,7 @@
uint32_t dataLen
)
{
- if(dataLen > SIZE_MAX)
- {
- return CSTATUS_FAIL;
- }
+ _sizet_check(dataLen)
/*
* Function returns the next counter value which is not
diff --git a/src/crypto/impl/openssl.c b/src/crypto/impl/openssl.c
index 1217e60..90028e6 100644
--- a/src/crypto/impl/openssl.c
+++ b/src/crypto/impl/openssl.c
@@ -23,24 +23,156 @@
#ifdef OPENSSL_CRYPTO_LIB
-#include <openssl/sha.h>
-
#include "nc-util.h"
+#include <openssl/crypto.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)
-{
+#define _OSSL_FAIL(x) if(!(x)) return CSTATUS_FAIL;
+
+#ifndef _IMPL_SECURE_ZERO_MEMSET
+
+ #define _IMPL_SECURE_ZERO_MEMSET _ossl_secure_zero_memset
+
+ _IMPLSTB void _ossl_secure_zero_memset(void* ptr, size_t size)
+ {
+ _sizet_check(size)
+
+ OPENSSL_cleanse(ptr, size);
+ }
+#endif
+
+#ifndef _IMPL_CRYPTO_FIXED_TIME_COMPARE
+
+ #define _IMPL_CRYPTO_FIXED_TIME_COMPARE _ossl_fixed_time_compare
+
+ _IMPLSTB uint32_t _ossl_fixed_time_compare(const uint8_t* a, const uint8_t* b, uint32_t size)
+ {
+ int result;
+
+ _sizet_check(size)
+
+ result = CRYPTO_memcmp(a, b, size);
+
+ return (uint32_t)result;
+ }
+
+#endif /* _IMPL_CRYPTO_FIXED_TIME_COMPARE */
+
+
+#ifndef _IMPL_CRYPTO_SHA256_DIGEST
+
+ #include <openssl/sha.h>
+
+ #define _IMPL_CRYPTO_SHA256_DIGEST _ossl_sha256_digest
+
+ _IMPLSTB cstatus_t _ossl_sha256_digest(const cspan_t* data, sha256_t digestOut32)
+ {
+ _sizet_check(data->size)
+
+ _OSSL_FAIL(SHA256(data->data, data->size, digestOut32))
+
+ return CSTATUS_OK;
+ }
+
+#endif
+
+#ifndef _IMPL_CRYPTO_SHA256_HMAC
+
+ #include <openssl/hmac.h>
+
+ /* Export function */
+ #define _IMPL_CRYPTO_SHA256_HMAC _ossl_hmac_sha256
+
+ _IMPLSTB cstatus_t _ossl_hmac_sha256(const cspan_t* key, const cspan_t* data, sha256_t hmacOut32)
+ {
+ unsigned int hmacLen;
+
+ _sizet_check(key->size)
+ _sizet_check(data->size)
+
+ hmacLen = sizeof(sha256_t);
+
+ _OSSL_FAIL(
+ HMAC(
+ EVP_sha256(),
+ key->data,
+ key->size,
+ data->data,
+ data->size,
+ hmacOut32,
+ &hmacLen
+ )
+ )
+
+ /* digest length should match the actual digest size */
+ _OSSL_FAIL(hmacLen != sizeof(sha256_t))
+
+ return CSTATUS_OK;
+ }
+
+#endif /* !_IMPL_CRYPTO_SHA256_HMAC */
+
+#ifndef _IMPL_CRYPTO_SHA256_HKDF_EXPAND
+
+ #include <openssl/hmac.h>
+ #include "hkdf.h"
+
+ #define _IMPL_CRYPTO_SHA256_HKDF_EXPAND _ossl_sha256_hkdf_expand
+
+ cstatus_t _ossl_hkdf_update(void* ctx, const cspan_t* data)
+ {
+ DEBUG_ASSERT(ctx != NULL)
+
+ _OSS_FAIL(HMAC_Update((HMAC_CTX*)ctx, data->data, data->size))
+
+ return CSTATUS_OK;
+ }
+
+ cstatus_t _ossl_hkdf_finish(void* ctx, sha256_t hmacOut32)
+ {
+ DEBUG_ASSERT(ctx != NULL)
+
+ _OSSL_FAIL(HMAC_Final((HMAC_CTX*)ctx, hmacOut32, NULL))
+
+ return CSTATUS_OK;
+ }
+
+ _IMPLSTB cstatus_t _ossl_fallback_hkdf_expand(const cspan_t* prk, const cspan_t* info, span_t* okm)
+ {
+ HMAC_CTX* hmac;
+ cstatus_t result;
+ struct nc_hkdf_fn_cb_struct handler;
-}
+ /*
+ * NOTE! Hmac reusable flag must be set to allow for multiple
+ * calls to the finish function without losing the context.
+ */
+
+ if ((hmac = HMAC_CTX_new()) == NULL)
+ {
+ return CSTATUS_FAIL;
+ }
+
+
+ _OSSL_FAIL(
+ HMAC_Init_ex(
+ hmac,
+ prk->data,
+ pkr->size,
+ EVP_sha256(),
+ NULL
+ )
+ )
+
+ handler.update = _ossl_hkdf_update;
+ handler.finish = _ossl_hkdf_finish;
+
+ result = hkdfExpandProcess(&handler, hmac, info, okm);
+
+ HMAC_CTX_free(hmac);
+
+ return result;
+ }
+#endif /* !_IMPL_CRYPTO_SHA256_HKDF_EXPAND */
#endif /*!OPENSSL_CRYPTO_LIB */ \ No newline at end of file
generated by cgit (git 2.46.0) at 2024-11-16 22:23:25 +0000