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3 * (Royal Institute of Technology, Stockholm, Sweden).
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37 #include <krb5-types.h>
49 * As descriped in PKCS5, convert a password, salt, and iteration counter into a crypto key.
51 * @param password Password.
52 * @param password_len Length of password.
54 * @param salt_len Length of salt.
55 * @param iter iteration counter.
56 * @param keylen the output key length.
57 * @param key the output key.
59 * @return 1 on success, non 1 on failure.
61 * @ingroup hcrypto_misc
65 PKCS5_PBKDF2_HMAC_SHA1(const void * password, size_t password_len,
66 const void * salt, size_t salt_len,
68 size_t keylen, void *key)
70 size_t datalen, leftofkey, checksumsize;
71 char *data, *tmpcksum;
77 unsigned int hmacsize;
80 checksumsize = EVP_MD_size(md);
81 datalen = salt_len + 4;
83 tmpcksum = malloc(checksumsize + datalen);
87 data = &tmpcksum[checksumsize];
89 memcpy(data, salt, salt_len);
98 if (leftofkey > checksumsize)
103 data[datalen - 4] = (keypart >> 24) & 0xff;
104 data[datalen - 3] = (keypart >> 16) & 0xff;
105 data[datalen - 2] = (keypart >> 8) & 0xff;
106 data[datalen - 1] = (keypart) & 0xff;
108 HMAC(md, password, password_len, data, datalen,
109 tmpcksum, &hmacsize);
111 memcpy(p, tmpcksum, len);
112 for (i = 1; i < iter; i++) {
113 HMAC(md, password, password_len, tmpcksum, checksumsize,
114 tmpcksum, &hmacsize);
116 for (j = 0; j < len; j++)