crypto: make context a const pointer

Author: DacoTaco

gc/ogc/sha.h

@@ -47,13 +47,68 @@ typedef struct
 	u32 lower_length;
 } sha_context;
 
+/*! 
+ * \fn s32 SHA_Init(void)
+ * \brief Initializes the SHA1 subsystem. This call could be done in the early stages of your main()
+ *
+ * \return 0 or higher on success, otherwise the returned error code
+ */
 s32 SHA_Init(void);
+
+/*! 
+ * \fn s32 SHA_Close(void)
+ * \brief Closes the SHA1 subsystem handlers. This call could be done when exiting your application or before reloading IOS
+ *
+ * \return 0 or higher on success, otherwise the returned error code
+ */
 s32 SHA_Close(void);
+
+/*! 
+ * \fn s32 SHA_Calculate(const void* data, const u32 data_size, void* message_digest)
+ * \brief Calculates the SHA1 hash of the given data, and puts it in message_digest
+ *
+ * \param[in] data pointer to the data to hash. if it is not 64-byte aligned an internal buffer will be used
+ * \param[in] data_size size of the data to hash
+ * \param[out] message_digest pointer to where to write the hash to
+ *
+ * \return 0 or higher on success, otherwise the returned error code
+ */
 s32 SHA_Calculate(const void* data, const u32 data_size, void* message_digest);
 
-s32 SHA_InitializeContext(sha_context* context);
-s32 SHA_Input(sha_context* context, const void* data, const u32 data_size);
-s32 SHA_Finalize(sha_context* context, const void* data, const u32 data_size, void* message_digest);
+/*! 
+ * \fn s32 SHA_InitializeContext(sha_context* context)
+ * \brief Initializes the given sha context
+ *
+ * \param[in] context pointer to the sha_context to initialize
+ * 
+ * \return 0 or higher on success, otherwise the returned error code
+ */
+s32 SHA_InitializeContext(const sha_context* context);
+
+/*! 
+ * \fn s32 SHA_Input(const sha_context* context, const void* data, const u32 data_size)
+ * \brief Adds data to the given sha_context and hashes it
+ *
+ * \param[in] context pointer to the sha_context to use
+ * \param[in] data pointer to the data to hash. if it is not 64-byte aligned an internal buffer will be used
+ * \param[in] data_size size of the data to hash
+ * 
+ * \return 0 or higher on success, otherwise the returned error code
+ */
+s32 SHA_Input(const sha_context* context, const void* data, const u32 data_size);
+
+/*! 
+ * \fn s32 SHA_Finalize(const sha_context* context, const void* data, const u32 data_size, void* message_digest)
+ * \brief Calculates the final SHA1 hash of the given context and last data, and puts it in message_digest
+ *
+ * \param[in] context pointer to the sha_context to use
+ * \param[in] data pointer to the data to hash. if it is not 64-byte aligned an internal buffer will be used
+ * \param[in] data_size size of the data to hash
+ * \param[out] message_digest pointer to where to write the final SHA1 hash to
+ *
+ * \return 0 or higher on success, otherwise the returned error code
+ */
+s32 SHA_Finalize(const sha_context* context, const void* data, const u32 data_size, void* message_digest);
 
 #ifdef __cplusplus
 	}

libogc/sha.c

@@ -46,7 +46,7 @@ typedef enum
 } ShaCommand;
 static u8 input_buffer[0x1000] ATTRIBUTE_ALIGN(64);
 
-static s32 SHA_ExecuteCommand(const ShaCommand command, sha_context* context, const void* in_data, const u32 data_size, void* out_data)
+static s32 SHA_ExecuteCommand(const ShaCommand command, const sha_context* context, const void* in_data, const u32 data_size, void* out_data)
 {
 	ioctlv* params = (ioctlv*)iosAlloc(__sha_hid, sizeof(ioctlv) * 3);
 	if(params == NULL)
@@ -127,7 +127,7 @@ s32 SHA_Close(void)
 	return 0;
 }
 
-s32 SHA_InitializeContext(sha_context* context)
+s32 SHA_InitializeContext(const sha_context* context)
 {
 	if(context == NULL)
 		return -1;
@@ -148,18 +148,19 @@ s32 SHA_InitializeContext(sha_context* context)
 	return ret;
 }
 
-s32 SHA_Input(sha_context* context, const void* data, const u32 data_size)
+s32 SHA_Input(const sha_context* context, const void* data, const u32 data_size)
 {
+	//when adding data, it should be in 64-byte blocks.
 	if(context == NULL || data == NULL || data_size == 0)
 		return -1;
 
-	if(((u32)context) & 0x1F)
+	if(((u32)context) & 0x1F || data_size & 0x3F)
 		return -4;
 
 	return SHA_ExecuteCommand(AddData, context, data, data_size, NULL);
 }
 
-s32 SHA_Finalize(sha_context* context, const void* data, const u32 data_size, void* message_digest)
+s32 SHA_Finalize(const sha_context* context, const void* data, const u32 data_size, void* message_digest)
 {
 	if(context == NULL || message_digest == NULL || data_size == 0 || data == NULL)
 		return -1;
@@ -172,7 +173,7 @@ s32 SHA_Finalize(sha_context* context, const void* data, const u32 data_size, vo
 
 s32 SHA_Calculate(const void* data, const u32 data_size, void* message_digest)
 {
-	sha_context context ATTRIBUTE_ALIGN(32);
+	sha_context context ATTRIBUTE_ALIGN(32) = {0};
 	s32 ret = SHA_InitializeContext(&context);
 	if(ret < 0)
 		return ret;