/*
* Function to derive a new key from a given key and given constant data.
*/
static krb5_error_code
derive_key_lucid(const gss_krb5_lucid_key_t *in, gss_krb5_lucid_key_t *out,
int usage, char extra)
{
krb5_error_code code;
unsigned char constant_data[K5CLENGTH];
krb5_data datain;
int keylength;
void *enc;
krb5_keyblock kin, kout; /* must send krb5_keyblock, not lucid! */
#ifdef HAVE_HEIMDAL
krb5_context kcontext;
krb5_keyblock *outkey;
#endif
/*
* XXX Hack alert. We don't have "legal" access to these
* values and structures located in libk5crypto
*/
switch (in->type) {
case ENCTYPE_DES3_CBC_SHA1:
#ifdef HAVE_KRB5
case ENCTYPE_DES3_CBC_RAW:
#endif
keylength = 24;
#ifdef HAVE_KRB5
enc = &krb5int_enc_des3;
#endif
break;
case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
keylength = 16;
#ifdef HAVE_KRB5
enc = &krb5int_enc_aes128;
#endif
break;
case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
keylength = 32;
#ifdef HAVE_KRB5
enc = &krb5int_enc_aes256;
#endif
break;
default:
code = KRB5_BAD_ENCTYPE;
goto out;
}
/* allocate memory for output key */
if ((out->data = malloc(keylength)) == NULL) {
code = ENOMEM;
goto out;
}
out->length = keylength;
out->type = in->type;
/* Convert to correct format for call to krb5_derive_key */
key_lucid_to_krb5(in, &kin);
key_lucid_to_krb5(out, &kout);
datain.data = (char *) constant_data;
datain.length = K5CLENGTH;
((char *)(datain.data))[0] = (usage>>24)&0xff;
((char *)(datain.data))[1] = (usage>>16)&0xff;
((char *)(datain.data))[2] = (usage>>8)&0xff;
((char *)(datain.data))[3] = usage&0xff;
((char *)(datain.data))[4] = (char) extra;
#ifdef HAVE_KRB5
code = krb5_derive_key(enc, &kin, &kout, &datain);
#else
if ((code = krb5_init_context(&kcontext))) {
}
code = krb5_derive_key(kcontext, &kin, in->type, constant_data, K5CLENGTH, &outkey);
#endif
if (code) {
free(out->data);
out->data = NULL;
goto out;
}
#ifdef HAVE_KRB5
key_krb5_to_lucid(&kout, out);
#else
key_krb5_to_lucid(outkey, out);
krb5_free_keyblock(kcontext, outkey);
krb5_free_context(kcontext);
#endif
out:
if (code)
printerr(0, "ERROR: %s: returning error %d (%s)\n",
__FUNCTION__, code, error_message(code));
return (code);
}
/*
* Function to derive a new key from a given key and given constant data.
*/
static krb5_error_code
derive_key_lucid(const gss_krb5_lucid_key_t *in, gss_krb5_lucid_key_t *out,
int usage, char extra)
{
krb5_error_code code;
unsigned char constant_data[K5CLENGTH];
krb5_data datain;
int keylength __attribute__ ((unused));
#ifdef HAVE_KRB5
void *enc;
#endif
krb5_keyblock kin; /* must send krb5_keyblock, not lucid! */
#if defined(HAVE_HEIMDAL) || HAVE_KRB5INT_DERIVE_KEY
krb5_context kcontext;
krb5_keyblock *outkey;
#else
krb5_keyblock kout;
#endif
#if HAVE_KRB5INT_DERIVE_KEY
krb5_key key_in, key_out;
#endif
/*
* XXX Hack alert. We don't have "legal" access to these
* values and structures located in libk5crypto
*/
switch (in->type) {
case ENCTYPE_DES3_CBC_SHA1:
#ifdef HAVE_KRB5
case ENCTYPE_DES3_CBC_RAW:
#endif
keylength = 24;
#ifdef HAVE_KRB5
enc = &krb5int_enc_des3;
#endif
break;
case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
keylength = 16;
#ifdef HAVE_KRB5
enc = &krb5int_enc_aes128;
#endif
break;
case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
keylength = 32;
#ifdef HAVE_KRB5
enc = &krb5int_enc_aes256;
#endif
break;
default:
code = KRB5_BAD_ENCTYPE;
goto out;
}
/* Convert to correct format for call to krb5_derive_key */
key_lucid_to_krb5(in, &kin);
datain.data = (char *) constant_data;
datain.length = K5CLENGTH;
((char *)(datain.data))[0] = (usage>>24)&0xff;
((char *)(datain.data))[1] = (usage>>16)&0xff;
((char *)(datain.data))[2] = (usage>>8)&0xff;
((char *)(datain.data))[3] = usage&0xff;
((char *)(datain.data))[4] = (char) extra;
/* Step 1: Init context */
/* Heimdal and newer MIT Kerberos require kcontext */
#if defined(HAVE_KRB5INT_DERIVE_KEY) || defined(HAVE_HEIMDAL)
code = krb5_init_context(&kcontext);
if (code)
goto out;
#endif
/* Step 2: Get the derived key */
#ifdef HAVE_KRB5
#if HAVE_KRB5INT_DERIVE_KEY
code = krb5_k_create_key(kcontext, &kin, &key_in);
if (code)
goto out;
code = ll_krb5int_derive_key(enc, key_in, &key_out, &datain,
DERIVE_RFC3961);
krb5_k_free_key(kcontext, key_in);
if (code == 0) {
krb5_k_key_keyblock(kcontext, key_out, &outkey);
krb5_k_free_key(kcontext, key_out);
}
#else /* !HAVE_KRB5INT_DERIVE_KEY */
out->length = keylength;
out->type = in->type;
key_lucid_to_krb5(out, &kout);
code = krb5_derive_key(enc, &kin, &kout, &datain);
#endif /* HAVE_KRB5INT_DERIVE_KEY */
#else /* !defined(HAVE_KRB5) */
code = krb5_derive_key(kcontext, &kin, in->type, constant_data, K5CLENGTH, &outkey);
#endif /* defined(HAVE_KRB5) */
if (code)
goto out;
/* Step 3: Copy the key to out */
#if defined(HAVE_KRB5INT_DERIVE_KEY) || defined(HAVE_HEIMDAL)
code = key_krb5_to_lucid(outkey, out);
krb5_free_keyblock(kcontext, outkey);
#else /* !defined(HAVE_KRB5) */
code = key_krb5_to_lucid(&kout, out);
#endif /* defined(HAVE_KRB5) */
/* Step 4: Free the context */
#if defined(HAVE_KRB5INT_DERIVE_KEY) || defined(HAVE_HEIMDAL)
krb5_free_context(kcontext);
#endif
out:
if (code)
printerr(0, "ERROR: %s: returning error %d (%s)\n",
__FUNCTION__, code, error_message(code));
return (code);
}
