-
-
-static int
-readDigest(CT ct, char *cp)
-{
- int bitno, skip;
- unsigned long bits;
- char *bp = cp;
- unsigned char *dp, value, *ep;
- unsigned char *b, *b1, *b2, *b3;
-
- b = (unsigned char *) &bits,
- b1 = &b[endian > 0 ? 1 : 2],
- b2 = &b[endian > 0 ? 2 : 1],
- b3 = &b[endian > 0 ? 3 : 0];
- bitno = 18;
- bits = 0L;
- skip = 0;
-
- for (ep = (dp = ct->c_digest)
- + sizeof(ct->c_digest) / sizeof(ct->c_digest[0]); *cp; cp++)
- switch (*cp) {
- default:
- if (skip || (*cp & 0x80) ||
- (value = b642nib[*cp & 0x7f])
- > 0x3f) {
- if (debugsw)
- fprintf(stderr, "invalid BASE64 encoding\n");
- return NOTOK;
- }
-
- bits |= value << bitno;
-test_end:
- if ((bitno -= 6) < 0) {
- if (dp + (3 - skip) > ep)
- goto invalid_digest;
- *dp++ = *b1;
- if (skip < 2) {
- *dp++ = *b2;
- if (skip < 1)
- *dp++ = *b3;
- }
- bitno = 18;
- bits = 0L;
- skip = 0;
- }
- break;
-
- case '=':
- if (++skip > 3)
- goto self_delimiting;
- goto test_end;
- }
- if (bitno != 18) {
- if (debugsw)
- fprintf(stderr, "premature ending (bitno %d)\n",
- bitno);
-
- return NOTOK;
- }
-self_delimiting:
- if (dp != ep) {
-invalid_digest:
- if (debugsw) {
- while (*cp)
- cp++;
- fprintf(stderr, "invalid MD5 digest (got %d octets)\n",
- (int)(cp - bp));
- }
-
- return NOTOK;
- }
-
- if (debugsw) {
- fprintf(stderr, "MD5 digest=");
- for (dp = ct->c_digest; dp < ep; dp++)
- fprintf(stderr, "%02x", *dp & 0xff);
- fprintf(stderr, "\n");
- }
-
- return OK;
-}