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1/*
2    See license.txt in the root of this project.
3*/
4
5# include "luametatex.h"
6
7# include <utilsha.h>
8
9# define SHA256_RESULT_LENGTH (SHA256_STRING_LENGTH-1)
10# define SHA384_RESULT_LENGTH (SHA384_STRING_LENGTH-1)
11# define SHA512_RESULT_LENGTH (SHA512_STRING_LENGTH-1)
12
13# define sha2_body(SHA_DIGEST_LENGTH, SHA_CALCULATE, CONVERSION, SHA_RESULT_LENGTH) do { \
14    if (lua_type(L, 1) == LUA_TSTRING) { \
15        uint8_t result[SHA_DIGEST_LENGTH]; \
16        size_t size = 0; \
17        const char *data = lua_tolstring(L, 1, &size); \
18        SHA_CALCULATE(data, size, result, CONVERSION); \
19        lua_pushlstring(L, (const char *) result, SHA_RESULT_LENGTH); \
20        return 1; \
21    } \
22    return 0; \
23} while (0)
24
25static int sha2lib_256_sum(lua_State *L) { sha2_body(SHA256_DIGEST_LENGTH, sha256_digest, SHA_BYTES, SHA256_DIGEST_LENGTH); }
26static int sha2lib_384_sum(lua_State *L) { sha2_body(SHA384_DIGEST_LENGTH, sha384_digest, SHA_BYTES, SHA384_DIGEST_LENGTH); }
27static int sha2lib_512_sum(lua_State *L) { sha2_body(SHA512_DIGEST_LENGTH, sha512_digest, SHA_BYTES, SHA512_DIGEST_LENGTH); }
28static int sha2lib_256_hex(lua_State *L) { sha2_body(SHA256_STRING_LENGTH, sha256_digest, SHA_LCHEX, SHA256_RESULT_LENGTH); }
29static int sha2lib_384_hex(lua_State *L) { sha2_body(SHA384_STRING_LENGTH, sha384_digest, SHA_LCHEX, SHA384_RESULT_LENGTH); }
30static int sha2lib_512_hex(lua_State *L) { sha2_body(SHA512_STRING_LENGTH, sha512_digest, SHA_LCHEX, SHA512_RESULT_LENGTH); }
31static int sha2lib_256_HEX(lua_State *L) { sha2_body(SHA256_STRING_LENGTH, sha256_digest, SHA_UCHEX, SHA256_RESULT_LENGTH); }
32static int sha2lib_384_HEX(lua_State *L) { sha2_body(SHA384_STRING_LENGTH, sha384_digest, SHA_UCHEX, SHA384_RESULT_LENGTH); }
33static int sha2lib_512_HEX(lua_State *L) { sha2_body(SHA512_STRING_LENGTH, sha512_digest, SHA_UCHEX, SHA512_RESULT_LENGTH); }
34
35static struct luaL_Reg sha2lib_function_list[] = {
36    /*tex We started out with this: */
37    { "digest256", sha2lib_256_sum },
38    { "digest384", sha2lib_384_sum },
39    { "digest512", sha2lib_512_sum },
40    /*tex The next is consistent with |md5lib|: */
41    { "sum256",    sha2lib_256_sum },
42    { "sum384",    sha2lib_384_sum },
43    { "sum512",    sha2lib_512_sum },
44    { "hex256",    sha2lib_256_hex },
45    { "hex384",    sha2lib_384_hex },
46    { "hex512",    sha2lib_512_hex },
47    { "HEX256",    sha2lib_256_HEX },
48    { "HEX384",    sha2lib_384_HEX },
49    { "HEX512",    sha2lib_512_HEX },
50    { NULL,        NULL            },
51};
52
53int luaopen_sha2(lua_State *L) {
54    lua_newtable(L);
55    luaL_setfuncs(L, sha2lib_function_list, 0);
56    return 1;
57}
58