/* NETWOX Network toolbox Copyright(c) 1999-2006 Laurent Constantin ----- Main server : http://www.laurentconstantin.com/ Backup servers : http://go.to/laurentconstantin/ http://laurentconstantin.est-la.com/ http://laurentconstantin.free.fr/ http://membres.lycos.fr/lauconstantin/ [my current email address is on the web servers] ----- This file is part of Netwox. Netwox is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License version 2 as published by the Free Software Foundation. Netwox is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details (http://www.gnu.org/). ------------------------------------------------------------------------ */ /*-------------------------------------------------------------*/ #include "../../netwox.h" /*-------------------------------------------------------------*/ /* Permutation table: {0..255} => {0..255}. RFC says this table is constructed from the digits of PI, but I don't know how. */ static unsigned char S[256] = { 41, 46, 67, 201, 162, 216, 124, 1, 61, 54, 84, 161, 236, 240, 6, 19, 98, 167, 5, 243, 192, 199, 115, 140, 152, 147, 43, 217, 188, 76, 130, 202, 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24, 138, 23, 229, 18, 190, 78, 196, 214, 218, 158, 222, 73, 160, 251, 245, 142, 187, 47, 238, 122, 169, 104, 121, 145, 21, 178, 7, 63, 148, 194, 16, 137, 11, 34, 95, 33, 128, 127, 93, 154, 90, 144, 50, 39, 53, 62, 204, 231, 191, 247, 151, 3, 255, 25, 48, 179, 72, 165, 181, 209, 215, 94, 146, 42, 172, 86, 170, 198, 79, 184, 56, 210, 150, 164, 125, 182, 118, 252, 107, 226, 156, 116, 4, 241, 69, 157, 112, 89, 100, 113, 135, 32, 134, 91, 207, 101, 230, 45, 168, 2, 27, 96, 37, 173, 174, 176, 185, 246, 28, 70, 97, 105, 52, 64, 126, 15, 85, 71, 163, 35, 221, 81, 175, 58, 195, 92, 249, 206, 186, 197, 234, 38, 44, 83, 13, 110, 133, 40, 132, 9, 211, 223, 205, 244, 65, 129, 77, 82, 106, 220, 55, 200, 108, 193, 171, 250, 36, 225, 123, 8, 12, 189, 177, 74, 120, 136, 149, 139, 227, 99, 232, 109, 233, 203, 213, 254, 59, 0, 29, 57, 242, 239, 183, 14, 102, 88, 208, 228, 166, 119, 114, 248, 235, 117, 75, 10, 49, 68, 80, 180, 143, 237, 31, 26, 219, 153, 141, 51, 159, 17, 131, 20 }; /*-------------------------------------------------------------*/ netwib_err netwox_md2_init(netwox_md2_context *pcontext) { netwib_c_memset(pcontext->state, 0, sizeof(pcontext->state)); netwib_c_memset(pcontext->checksum, 0, sizeof(pcontext->checksum)); pcontext->totalbytes = 0; pcontext->bufsize = 0; return(NETWIB_ERR_OK); } /*-------------------------------------------------------------*/ /* update a 16 bytes block */ static netwib_err netwox_priv_md2_update16(netwox_md2_context *pcontext, netwib_constdata data) { netwib_uint8 x[48]; netwib_uint32 i, j, k; /* update state of the block */ /* create a 48 bytes array */ netwib_c_memcpy(x, pcontext->state, 16); netwib_c_memcpy(x+16, data, 16); for (i = 0; i < 16; i++) { x[i+32] = (netwib_uint8)(pcontext->state[i] ^ data[i]); } /* encrypt */ k = 0; for (i = 0; i < 18; i++) { for (j = 0; j < 48; j++) { x[j] ^= S[k]; k = x[j]; } k = (k + i) & 0xff; /* increment modulo 256 */ } /* save state */ netwib_c_memcpy(pcontext->state, x, 16); /* update checksum of the block */ k = pcontext->checksum[15]; for (i = 0; i < 16; i++) { pcontext->checksum[i] ^= S[data[i] ^ k]; k = pcontext->checksum[i]; } return(NETWIB_ERR_OK); } /*-------------------------------------------------------------*/ /* take data from context */ static netwib_err netwox_priv_md2_update16_ctx(netwox_md2_context *pcontext) { if (pcontext->bufsize != NETWOX_MD2_BLOCK_LEN) { return(NETWOX_ERR_INTERNALERROR); } netwib_er(netwox_priv_md2_update16(pcontext, pcontext->buf)); pcontext->bufsize = 0; return(NETWIB_ERR_OK); } /*-------------------------------------------------------------*/ netwib_err netwox_md2_update(netwox_md2_context *pcontext, netwib_constbuf *pbuf) { netwib_data data; netwib_uint32 datasize; datasize = netwib__buf_ref_data_sizenull(pbuf); if (datasize == 0) { return(NETWIB_ERR_OK); } data = netwib__buf_ref_data_ptr(pbuf); pcontext->totalbytes += datasize; if (pcontext->bufsize) { while (datasize && (pcontext->bufsize < NETWOX_MD2_BLOCK_LEN)) { pcontext->buf[pcontext->bufsize++] = *data++; datasize--; } if (pcontext->bufsize == NETWOX_MD2_BLOCK_LEN) { netwib_er(netwox_priv_md2_update16_ctx(pcontext)); } } while (datasize >= NETWOX_MD2_BLOCK_LEN) { netwib_er(netwox_priv_md2_update16(pcontext, data)); data += NETWOX_MD2_BLOCK_LEN; datasize -= NETWOX_MD2_BLOCK_LEN; } while (datasize) { pcontext->buf[pcontext->bufsize++] = *data++; datasize--; } return(NETWIB_ERR_OK); } /*-------------------------------------------------------------*/ netwib_err netwox_md2_final(netwox_md2_context *pcontext, netwib_buf *pmd) { netwib_uint8 pad[NETWOX_MD2_BLOCK_LEN]; netwib_uint32 padsize, i; netwib_buf buf; /* add padding (even if not needed) */ padsize = NETWOX_MD2_BLOCK_LEN - pcontext->bufsize; for (i = 0; i < padsize; i++) { pad[i] = (netwib_uint8)padsize; /* store size in the value */ } netwib_er(netwib_buf_init_ext_arrayfilled(pad, padsize, &buf)); netwib_er(netwox_md2_update(pcontext, &buf)); /* add checksum */ netwib_er(netwox_priv_md2_update16(pcontext, pcontext->checksum)); /* state contains the result */ netwib_er(netwib_buf_append_data(pcontext->state, 16, pmd)); return(NETWIB_ERR_OK); } /*-------------------------------------------------------------*/ netwib_err netwox_md2_compute(netwib_constbuf *pbuf, netwib_buf *pmd) { netwox_md2_context ctx; netwib_er(netwox_md2_init(&ctx)); netwib_er(netwox_md2_update(&ctx, pbuf)); netwib_er(netwox_md2_final(&ctx, pmd)); return(NETWIB_ERR_OK); } /*-------------------------------------------------------------*/ /*-------------------------------------------------------------*/ /*-------------------------------------------------------------*/ static netwib_err netwox_priv_md2_test(netwib_conststring data, netwib_conststring mdwanted) { netwib_buf buf, md; netwib_er(netwib_buf_init_ext_string(data, &buf)); netwib_er(netwib_buf_init_mallocdefault(&md)); netwib_er(netwox_md2_compute(&buf, &md)); netwib_er(netwox_buf_check_strmixed(&md, mdwanted)); netwib_er(netwib_buf_close(&md)); return(NETWIB_ERR_OK); } /*-------------------------------------------------------------*/ netwib_err netwox_md2_test() { /* rfc test suite */ netwib_er(netwox_priv_md2_test("", "8350e5a3e24c153df2275c9f80692773")); netwib_er(netwox_priv_md2_test("a", "32ec01ec4a6dac72c0ab96fb34c0b5d1")); netwib_er(netwox_priv_md2_test("abc", "da853b0d3f88d99b30283a69e6ded6bb")); netwib_er(netwox_priv_md2_test("message digest", "ab4f496bfb2a530b219ff33031fe06b0")); netwib_er(netwox_priv_md2_test("abcdefghijklmnopqrstuvwxyz", "4e8ddff3650292ab5a4108c3aa47940b")); netwib_er(netwox_priv_md2_test("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789", "da33def2a42df13975352846c30338cd")); netwib_er(netwox_priv_md2_test("12345678901234567890123456789012345678901234567890123456789012345678901234567890", "d5976f79d83d3a0dc9806c3c66f3efd8")); return(NETWIB_ERR_OK); }