diff options
| -rw-r--r-- | apps/test.c | 18 | ||||
| -rw-r--r-- | libc/Makefile | 1 | ||||
| -rw-r--r-- | libc/crypto.c | 166 | ||||
| -rw-r--r-- | libc/inc/crypto.h | 11 |
4 files changed, 196 insertions, 0 deletions
diff --git a/apps/test.c b/apps/test.c index d64e224..18d9f8b 100644 --- a/apps/test.c +++ b/apps/test.c @@ -2,6 +2,7 @@ #include <conv.h> #include <cpu.h> +#include <crypto.h> #include <math.h> #include <mem.h> #include <print.h> @@ -35,6 +36,22 @@ TEST(math) EQUALS(pow(0, 0), 1); } +TEST(crypto) +{ + const char *text = "Melvix"; + u32 length = 6; + + EQUALS(crc32(0, text, length), 0x98bb3595); + + const u8 md5_text[16] = { + 0x01, 0xdc, 0xaf, 0x55, 0x2a, 0xe5, 0x7a, 0xf2, + 0xe5, 0xb4, 0x75, 0xac, 0x0f, 0x38, 0x97, 0x9c, + }; + u8 md5_res[16] = { 0 }; + md5(text, length, md5_res); + EQUALS(memcmp(md5_res, md5_text, 16), 0); +} + TEST(conv) { char buf1[1] = { 0 }; @@ -74,6 +91,7 @@ TEST(mem) int main(void) { test_math(); + test_crypto(); test_conv(); test_mem(); diff --git a/libc/Makefile b/libc/Makefile index 2dd2c5f..9ebf838 100644 --- a/libc/Makefile +++ b/libc/Makefile @@ -7,6 +7,7 @@ COBJS = sanitize.o \ alloc.o \ mem.o \ math.o \ + crypto.o \ conv.o \ print.o \ cpu.o \ diff --git a/libc/crypto.c b/libc/crypto.c new file mode 100644 index 0000000..310931d --- /dev/null +++ b/libc/crypto.c @@ -0,0 +1,166 @@ +// MIT License, Copyright (c) 2021 Marvin Borner + +#include <crypto.h> +#include <def.h> +#include <mem.h> + +/** + * MD5 + */ + +#define MD5_LEFTROTATE(x, c) (((x) << (c)) | ((x) >> (32 - (c)))) + +static const u32 md5_tab[64] = { + 0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, 0xf57c0faf, 0x4787c62a, 0xa8304613, + 0xfd469501, 0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be, 0x6b901122, 0xfd987193, + 0xa679438e, 0x49b40821, 0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa, 0xd62f105d, + 0x02441453, 0xd8a1e681, 0xe7d3fbc8, 0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed, + 0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a, 0xfffa3942, 0x8771f681, 0x6d9d6122, + 0xfde5380c, 0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70, 0x289b7ec6, 0xeaa127fa, + 0xd4ef3085, 0x04881d05, 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665, 0xf4292244, + 0x432aff97, 0xab9423a7, 0xfc93a039, 0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1, + 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1, 0xf7537e82, 0xbd3af235, 0x2ad7d2bb, + 0xeb86d391, +}; + +static const u32 md5_rounds[] = { + 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 5, 9, 14, 20, 5, 9, + 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, + 4, 11, 16, 23, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, +}; + +static void md5_u32_to_bytes(u32 val, u8 *bytes) +{ + bytes[0] = (u8)val; + bytes[1] = (u8)(val >> 8); + bytes[2] = (u8)(val >> 16); + bytes[3] = (u8)(val >> 24); +} + +static u32 md5_bytes_to_u32(u8 *bytes) +{ + return (u32)bytes[0] | ((u32)bytes[1] << 8) | ((u32)bytes[2] << 16) | ((u32)bytes[3] << 24); +} + +void md5(const void *initial_msg, u32 initial_len, u8 digest[16]) +{ + u32 w[16] = { 0 }; + + u32 h0 = 0x67452301; + u32 h1 = 0xefcdab89; + u32 h2 = 0x98badcfe; + u32 h3 = 0x10325476; + + u32 new_len; + for (new_len = initial_len + 1; new_len % (512 / 8) != 448 / 8; new_len++) + ; + + u8 *msg = malloc(new_len + 8); + memcpy(msg, initial_msg, initial_len); + msg[initial_len] = 0x80; + for (u32 offset = initial_len + 1; offset < new_len; offset++) + msg[offset] = 0; + + md5_u32_to_bytes(initial_len * 8, msg + new_len); + md5_u32_to_bytes(initial_len >> 29, msg + new_len + 4); + + for (u32 offset = 0; offset < new_len; offset += (512 / 8)) { + for (u32 i = 0; i < 16; i++) + w[i] = md5_bytes_to_u32(msg + offset + i * 4); + + u32 a = h0; + u32 b = h1; + u32 c = h2; + u32 d = h3; + + u32 f, g; + for (u32 i = 0; i < 64; i++) { + if (i < 16) { + f = (b & c) | ((~b) & d); + g = i; + } else if (i < 32) { + f = (d & b) | ((~d) & c); + g = (5 * i + 1) % 16; + } else if (i < 48) { + f = b ^ c ^ d; + g = (3 * i + 5) % 16; + } else { + f = c ^ (b | (~d)); + g = (7 * i) % 16; + } + + u32 temp = d; + d = c; + c = b; + b = b + MD5_LEFTROTATE((a + f + md5_tab[i] + w[g]), md5_rounds[i]); + a = temp; + } + + h0 += a; + h1 += b; + h2 += c; + h3 += d; + } + + free(msg); + + md5_u32_to_bytes(h0, digest); + md5_u32_to_bytes(h1, digest + 4); + md5_u32_to_bytes(h2, digest + 8); + md5_u32_to_bytes(h3, digest + 12); +} + +/** + * CRC32 + */ + +static const u32 crc32_tab[] = { + 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, + 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, + 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, + 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, + 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, + 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c, + 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, + 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f, + 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, + 0xb6662d3d, 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, + 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, + 0x086d3d2d, 0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, + 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, + 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, 0x4db26158, 0x3ab551ce, + 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, + 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, + 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, + 0xce61e49f, 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, + 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 0xead54739, + 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, + 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344, 0x8708a3d2, 0x1e01f268, + 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, + 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, + 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, + 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, + 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, + 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, + 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, + 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, + 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, + 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, 0x88085ae6, + 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, + 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, + 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, + 0x47b2cf7f, 0x30b5ffe9, 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, + 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, + 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d, +}; + +u32 crc32(u32 crc, const void *buf, u32 size) +{ + const u8 *p = buf; + crc = crc ^ ~0UL; + + while (size--) + crc = crc32_tab[(crc ^ *p++) & 0xFF] ^ (crc >> 8); + + return crc ^ ~0UL; +} diff --git a/libc/inc/crypto.h b/libc/inc/crypto.h new file mode 100644 index 0000000..bbe8d7e --- /dev/null +++ b/libc/inc/crypto.h @@ -0,0 +1,11 @@ +// MIT License, Copyright (c) 2021 Marvin Borner + +#ifndef CRYPTO_H +#define CRYPTO_H + +#include <def.h> + +void md5(const void *initial_msg, u32 initial_len, u8 digest[16]); +u32 crc32(u32 crc, const void *buf, u32 size); + +#endif |