lua-hash: introduce a lua hashing library using libubox.
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include $(TOPDIR)/rules.mk
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PKG_NAME:=lua-hash
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PKG_VERSION:=1
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PKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME)
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include $(INCLUDE_DIR)/package.mk
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define Package/lua-hash
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SECTION:=libs
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CATEGORY:=Libraries
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TITLE:=Lua hash library
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DEPENDS:=+lua +libubox
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endef
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define Build/Prepare
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mkdir -p $(PKG_BUILD_DIR)
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$(CP) ./src/* $(PKG_BUILD_DIR)/
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endef
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define Build/Configure
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endef
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define Build/Compile
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CFLAGS="$(TARGET_CFLAGS)" \
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CPPFLAGS="$(TARGET_CPPFLAGS)" \
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$(MAKE) -C $(PKG_BUILD_DIR) $(TARGET_CONFIGURE_OPTS)
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endef
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define Package/lua-hash/install
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$(INSTALL_DIR) $(1)/usr/lib/lua
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$(CP) $(PKG_BUILD_DIR)/hash.so $(1)/usr/lib/lua/
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endef
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$(eval $(call BuildPackage,lua-hash))
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all: hash.so
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CFLAGS += -Wall
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hash.so: hash.c
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$(CC) $(CPPFLAGS) $(CFLAGS) $(LDFLAGS) -shared -fPIC -o $@ $^ $(LDLIBS) -llua -lubox
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#include <libubox/md5.h>
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#include <lua.h>
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#include <lauxlib.h>
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#include <lualib.h>
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#include <stdlib.h>
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#include <string.h>
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#define MD5_DIGEST_LEN 16
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#define MD5_STRLEN (2*MD5_DIGEST_LEN+1)
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static int md5(lua_State *L) {
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size_t len;
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const char *input = lua_tolstring(L, 1, &len);
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if (input == NULL) {
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lua_pushstring(L, "first argument: should be the input string");
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lua_error(L);
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__builtin_unreachable();
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}
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unsigned char digest[MD5_DIGEST_LEN];
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char output[MD5_STRLEN];
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struct md5_ctx ctx;
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md5_begin(&ctx);
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md5_hash(input, len, &ctx);
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md5_end(digest, &ctx);
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// fill the digest bytewise in the output string
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int i;
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for (i = 0; i < MD5_DIGEST_LEN; i++) {
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sprintf(output + 2*i, "%02x", digest[i]);
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}
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lua_pushstring(L, output);
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return 1;
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}
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static const luaL_Reg R[] = {
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{"md5", md5},
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{NULL, NULL },
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};
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LUALIB_API int luaopen_hash(lua_State *L) {
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luaL_register(L, "hash", R);
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return 1;
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}
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#!/usr/bin/lua
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hash = require "hash"
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assert(hash.md5('testing') == 'ae2b1fca515949e5d54fb22b8ed95575')
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