mbedtls: use libmbedcrypto for hashing

CMakeLists.txt

@@ -48,7 +48,7 @@ OPTION( PROFILE				"Generate profiling information"		OFF )
 OPTION( ENABLE_TRACE		"Enables tracing support"				OFF )
 OPTION( LIBGIT2_FILENAME	"Name of the produced binary"			OFF )
 
-SET(SHA1_BACKEND "CollisionDetection" CACHE STRING "Backend to use for SHA1. One of Generic, OpenSSL, Win32, CommonCrypto, CollisionDetection. ")
+SET(SHA1_BACKEND "CollisionDetection" CACHE STRING "Backend to use for SHA1. One of Generic, OpenSSL, Win32, CommonCrypto, mbedTLS, CollisionDetection. ")
 OPTION( USE_SSH				"Link with libssh to enable SSH support" ON )
 OPTION( USE_HTTPS			"Enable HTTPS support. Can be set to a specific backend"	ON )
 OPTION( USE_GSSAPI			"Link with libgssapi for SPNEGO auth"   OFF )

src/CMakeLists.txt

@@ -243,6 +243,11 @@ ELSEIF(SHA1_BACKEND STREQUAL "Win32")
 ELSEIF(SHA1_BACKEND STREQUAL "CommonCrypto")
 	ADD_FEATURE_INFO(SHA ON "using CommonCrypto")
 	SET(GIT_SHA1_COMMON_CRYPTO 1)
+ELSEIF (SHA1_BACKEND STREQUAL "mbedTLS")
+	ADD_FEATURE_INFO(SHA ON "using mbedTLS")
+	SET(GIT_SHA1_MBEDTLS 1)
+	FILE(GLOB SRC_SHA1 src/hash/hash_mbedtls.c)
+	LIST(APPEND LIBGIT2_PC_REQUIRES "mbedtls")
 ELSE()
 	MESSAGE(FATAL_ERROR "Asked for unknown SHA1 backend ${SHA1_BACKEND}")
 ENDIF()

src/features.h.in

@@ -33,5 +33,6 @@
 #cmakedefine GIT_SHA1_WIN32 1
 #cmakedefine GIT_SHA1_COMMON_CRYPTO 1
 #cmakedefine GIT_SHA1_OPENSSL 1
+#cmakedefine GIT_SHA1_MBEDTLS 1
 
 #endif

src/hash.h

@@ -26,6 +26,8 @@ void git_hash_ctx_cleanup(git_hash_ctx *ctx);
 # include "hash/hash_openssl.h"
 #elif defined(GIT_SHA1_WIN32)
 # include "hash/hash_win32.h"
+#elif defined(GIT_SHA1_MBEDTLS)
+# include "hash/hash_mbedtls.h"
 #else
 # include "hash/hash_generic.h"
 #endif

src/hash/hash_mbedtls.c

+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+
+#include "common.h"
+#include "hash.h"
+#include "hash/hash_mbedtls.h"
+
+void git_hash_ctx_cleanup(git_hash_ctx *ctx)
+{
+    assert(ctx);
+    mbedtls_sha1_free(&ctx->c);
+}
+
+int git_hash_init(git_hash_ctx *ctx)
+{
+    assert(ctx);
+    mbedtls_sha1_init(&ctx->c);
+    mbedtls_sha1_starts(&ctx->c);
+    return 0;
+}
+
+int git_hash_update(git_hash_ctx *ctx, const void *data, size_t len)
+{
+    assert(ctx);
+    mbedtls_sha1_update(&ctx->c, data, len);
+    return 0;
+}
+
+int git_hash_final(git_oid *out, git_hash_ctx *ctx)
+{
+    assert(ctx);
+    mbedtls_sha1_finish(&ctx->c, out->id);
+    return 0;
+}

src/hash/hash_mbedtls.h

+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+
+#ifndef INCLUDE_hash_mbedtld_h__
+#define INCLUDE_hash_mbedtld_h__
+
+#include <mbedtls/sha1.h>
+
+struct git_hash_ctx {
+    mbedtls_sha1_context c;
+};
+
+#define git_hash_global_init() 0
+#define git_hash_ctx_init(ctx) git_hash_init(ctx)
+
+#endif /* INCLUDE_hash_mbedtld_h__ */