From a8087f4b8f602adbb1229c4e1ccbd60d1b36587b Mon Sep 17 00:00:00 2001 From: tdijck Date: Tue, 24 Mar 2015 17:16:52 -0700 Subject: [PATCH] add string.sha1 function --- src/host/premake.c | 1 + src/host/premake.h | 1 + src/host/string_sha1.c | 185 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 187 insertions(+) create mode 100644 src/host/string_sha1.c diff --git a/src/host/premake.c b/src/host/premake.c index 6f34a02f..dff4c7d2 100644 --- a/src/host/premake.c +++ b/src/host/premake.c @@ -80,6 +80,7 @@ static const luaL_Reg os_functions[] = { static const luaL_Reg string_functions[] = { { "endswith", string_endswith }, { "hash", string_hash }, + { "sha1", string_sha1 }, { "startswith", string_startswith }, { NULL, NULL } }; diff --git a/src/host/premake.h b/src/host/premake.h index 1a3c2bd3..f82b346d 100644 --- a/src/host/premake.h +++ b/src/host/premake.h @@ -118,6 +118,7 @@ int os_stat(lua_State* L); int os_uuid(lua_State* L); int string_endswith(lua_State* L); int string_hash(lua_State* L); +int string_sha1(lua_State* L); int string_startswith(lua_State* L); /* Engine interface */ diff --git a/src/host/string_sha1.c b/src/host/string_sha1.c new file mode 100644 index 00000000..81618a54 --- /dev/null +++ b/src/host/string_sha1.c @@ -0,0 +1,185 @@ +#include +#include +#include "premake.h" + +#define HASH_LENGTH 20 +#define BLOCK_LENGTH 64 + +typedef struct sha1nfo { + uint32_t buffer[BLOCK_LENGTH / 4]; + uint32_t state[HASH_LENGTH / 4]; + uint32_t byteCount; + uint8_t bufferOffset; + uint8_t keyBuffer[BLOCK_LENGTH]; + uint8_t innerHash[HASH_LENGTH]; +} sha1nfo; + +/* public API - prototypes - TODO: doxygen*/ +void sha1_init(sha1nfo *s); +void sha1_writebyte(sha1nfo *s, uint8_t data); +void sha1_write(sha1nfo *s, const char *data, size_t len); +uint8_t* sha1_result(sha1nfo *s); + +/* code */ +#define SHA1_K0 0x5a827999 +#define SHA1_K20 0x6ed9eba1 +#define SHA1_K40 0x8f1bbcdc +#define SHA1_K60 0xca62c1d6 + +void sha1_init(sha1nfo *s) +{ + s->state[0] = 0x67452301; + s->state[1] = 0xefcdab89; + s->state[2] = 0x98badcfe; + s->state[3] = 0x10325476; + s->state[4] = 0xc3d2e1f0; + s->byteCount = 0; + s->bufferOffset = 0; +} + +uint32_t sha1_rol32(uint32_t number, uint8_t bits) +{ + return ((number << bits) | (number >> (32 - bits))); +} + +void sha1_hashBlock(sha1nfo *s) +{ + uint8_t i; + uint32_t a, b, c, d, e, t; + + a = s->state[0]; + b = s->state[1]; + c = s->state[2]; + d = s->state[3]; + e = s->state[4]; + for (i = 0; i < 80; i++) + { + if (i >= 16) + { + t = s->buffer[(i + 13) & 15] ^ s->buffer[(i + 8) & 15] ^ s->buffer[(i + 2) & 15] ^ s->buffer[i & 15]; + s->buffer[i & 15] = sha1_rol32(t, 1); + } + if (i < 20) + { + t = (d ^ (b & (c ^ d))) + SHA1_K0; + } + else if (i < 40) + { + t = (b ^ c ^ d) + SHA1_K20; + } + else if (i < 60) + { + t = ((b & c) | (d & (b | c))) + SHA1_K40; + } + else + { + t = (b ^ c ^ d) + SHA1_K60; + } + t += sha1_rol32(a, 5) + e + s->buffer[i & 15]; + e = d; + d = c; + c = sha1_rol32(b, 30); + b = a; + a = t; + } + s->state[0] += a; + s->state[1] += b; + s->state[2] += c; + s->state[3] += d; + s->state[4] += e; +} + +void sha1_addUncounted(sha1nfo *s, uint8_t data) +{ + uint8_t * const b = (uint8_t*)s->buffer; + b[s->bufferOffset ^ 3] = data; + s->bufferOffset++; + if (s->bufferOffset == BLOCK_LENGTH) + { + sha1_hashBlock(s); + s->bufferOffset = 0; + } +} + +void sha1_writebyte(sha1nfo *s, uint8_t data) +{ + ++s->byteCount; + sha1_addUncounted(s, data); +} + +void sha1_write(sha1nfo *s, const char *data, size_t len) +{ + for (; len--;) sha1_writebyte(s, (uint8_t)*data++); +} + +void sha1_pad(sha1nfo *s) +{ + // Implement SHA-1 padding (fips180-2 ยง5.1.1) + + // Pad with 0x80 followed by 0x00 until the end of the block + sha1_addUncounted(s, 0x80); + while (s->bufferOffset != 56) sha1_addUncounted(s, 0x00); + + // Append length in the last 8 bytes + sha1_addUncounted(s, 0); // We're only using 32 bit lengths + sha1_addUncounted(s, 0); // But SHA-1 supports 64 bit lengths + sha1_addUncounted(s, 0); // So zero pad the top bits + sha1_addUncounted(s, s->byteCount >> 29); // Shifting to multiply by 8 + sha1_addUncounted(s, (uint8_t)(s->byteCount >> 21)); // as SHA-1 supports bitstreams as well as + sha1_addUncounted(s, (uint8_t)(s->byteCount >> 13)); // byte. + sha1_addUncounted(s, (uint8_t)(s->byteCount >> 5)); + sha1_addUncounted(s, (uint8_t)(s->byteCount << 3)); +} + +uint8_t* sha1_result(sha1nfo *s) +{ + int i; + + // Pad to complete the last block + sha1_pad(s); + + // Swap byte order back + for (i = 0; i < 5; i++) + { + s->state[i] = + (((s->state[i]) << 24) & 0xff000000) + | (((s->state[i]) << 8) & 0x00ff0000) + | (((s->state[i]) >> 8) & 0x0000ff00) + | (((s->state[i]) >> 24) & 0x000000ff); + } + + // Return pointer to hash (20 characters) + return (uint8_t*)s->state; +} + + + +int string_sha1(lua_State* L) +{ + static const char* g_int2hex = "0123456789ABCDEF"; + uint8_t* result; + size_t l; + sha1nfo s; + int i; + char output[41]; + + const char *str = luaL_checklstring(L, 1, &l); + if (str != NULL) + { + sha1_init(&s); + sha1_write(&s, str, l); + result = sha1_result(&s); + + for (i = 0; i < 20; ++i) + { + output[i * 2 + 0] = g_int2hex[result[i] & 0x0f]; + output[i * 2 + 1] = g_int2hex[result[i] >> 4]; + } + output[40] = 0; + + lua_pushlstring(L, output, 40); + return 1; + } + + return 0; +}