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Annotation of OpenXM/src/ox_ntl/crypt/sha1/ntlsha.cpp, Revision 1.3

1.3     ! iwane       1: /* $OpenXM: OpenXM/src/ox_ntl/crypt/sha1/ntlsha.cpp,v 1.2 2004/03/25 13:34:19 iwane Exp $ */
1.2       iwane       2: /* RFC 3174 -- see sha1.c */
1.1       iwane       3:
                      4: #include <NTL/ZZ.h>
                      5:
                      6: #include <stdlib.h>
1.3     ! iwane       7: #include <stdio.h>
1.1       iwane       8:
                      9: #include "sha1.h"
                     10:
                     11: int
                     12: ntl_sha1_h(ZZ &sha, const ZZ &m, unsigned int *t)
                     13: {
                     14:        unsigned char h[20]; // 160 bit
                     15:        unsigned char *msg, msg_buf[1024];
                     16:        unsigned int msglen = sizeof(msg);
                     17:        unsigned int i;
                     18:        unsigned char uch;
                     19:        int ret;
                     20:
                     21:        msglen = NumBytes(m);
1.3     ! iwane      22:        if (msglen <= sizeof(msg_buf)) {
1.1       iwane      23:                msg = msg_buf;
                     24:        } else {
                     25:                msg = new unsigned char[msglen];
                     26:        }
                     27:
                     28:        BytesFromZZ(msg, m, msglen);
                     29:
                     30:        for (i = 0; i < msglen / 2; i++) {
                     31:                uch = msg[i];
                     32:                msg[i] = msg[msglen - i - 1];
                     33:                msg[msglen - i - 1] = uch;
                     34:        }
                     35:
1.3     ! iwane      36:        ret = sha1_h(h, msg, msglen, t);
1.1       iwane      37:
                     38:        if (msg != msg_buf)
                     39:                delete [] msg;
                     40:
                     41:        for (i = 0; i < sizeof(h) / 2; i++) {
                     42:                uch = h[i];
                     43:                h[i] = h[sizeof(h) - i - 1];
                     44:                h[sizeof(h) - i - 1] = uch;
                     45:        }
                     46:
                     47:        ZZFromBytes(sha, h, sizeof(h));
                     48:
                     49:        return (ret);
                     50: }
                     51:
                     52: int
                     53: ntl_sha1(ZZ &sha, const ZZ &m)
                     54: {
                     55:        return (ntl_sha1_h(sha, m, NULL));
                     56: }
                     57:
                     58: