sha: split up finalize from calculate #185

this allows users to have full sha control via init/input/finalize or just call and go using calculate

Author: DacoTaco

gc/ogc/sha.h

@@ -49,12 +49,11 @@ typedef struct
 
 s32 SHA_Init(void);
 s32 SHA_Close(void);
-s32 SHA_InitializeContext(sha_context* context);
+s32 SHA_Calculate(const void* data, const u32 data_size, void* message_digest);
 
-//calculate hash or add data manually - input data should *always* be 64bit aligned!
-s32 SHA_Calculate(sha_context* context, 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);
 
 #ifdef __cplusplus
 	}

libogc/sha.c

@@ -147,26 +147,37 @@ s32 SHA_InitializeContext(sha_context* context)
 	iosFree(__sha_hid, params);
 	return ret;
 }
-s32 SHA_Calculate(sha_context* context, const void* data, const u32 data_size, void* message_digest)
+
+s32 SHA_Input(sha_context* context, const void* data, const u32 data_size)
 {
-	if(context == NULL || message_digest == NULL || data_size == 0 || data == NULL)
+	if(context == NULL || data == NULL || data_size == 0)
 		return -1;
 
-	if(((u32)context & 0x1F) != 0 || ((u32)message_digest & 0x1F) != 0)
+	if(((u32)context) & 0x1F)
 		return -4;
 
-	return SHA_ExecuteCommand(FinalizeHash, context, data, data_size, message_digest);
+	return SHA_ExecuteCommand(AddData, context, data, data_size, NULL);
 }
 
-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)
 {
-	if(context == NULL || data == NULL || data_size == 0)
+	if(context == NULL || message_digest == NULL || data_size == 0 || data == NULL)
 		return -1;
 
-	if(((u32)context) & 0x1F)
+	if(((u32)context & 0x1F) != 0 || ((u32)message_digest & 0x1F) != 0)
 		return -4;
 
-	return SHA_ExecuteCommand(AddData, context, data, data_size, NULL);
+	return SHA_ExecuteCommand(FinalizeHash, context, data, data_size, message_digest);
+}
+
+s32 SHA_Calculate(const void* data, const u32 data_size, void* message_digest)
+{
+	sha_context context ATTRIBUTE_ALIGN(32);
+	s32 ret = SHA_InitializeContext(&context);
+	if(ret < 0)
+		return ret;
+
+	return SHA_Finalize(&context, data, data_size, message_digest);
 }
 
 #endif