2 * Copyright (c) 2006 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
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38 RCSID("$Id: pkcs5.c,v 1.3 2006/05/05 10:23:11 lha Exp $");
41 #include <krb5-types.h>
53 PKCS5_PBKDF2_HMAC_SHA1(const void * password, size_t password_len,
54 const void * salt, size_t salt_len,
56 size_t keylen, void *key)
58 size_t datalen, leftofkey, checksumsize;
59 char *data, *tmpcksum;
65 unsigned int hmacsize;
68 checksumsize = EVP_MD_size(md);
69 datalen = salt_len + 4;
71 tmpcksum = malloc(checksumsize + datalen);
75 data = &tmpcksum[checksumsize];
77 memcpy(data, salt, salt_len);
86 if (leftofkey > checksumsize)
91 data[datalen - 4] = (keypart >> 24) & 0xff;
92 data[datalen - 3] = (keypart >> 16) & 0xff;
93 data[datalen - 2] = (keypart >> 8) & 0xff;
94 data[datalen - 1] = (keypart) & 0xff;
96 HMAC(md, password, password_len, data, datalen,
99 memcpy(p, tmpcksum, len);
100 for (i = 1; i < iter; i++) {
101 HMAC(md, password, password_len, tmpcksum, checksumsize,
102 tmpcksum, &hmacsize);
104 for (j = 0; j < len; j++)