--- /dev/null
+/*
+
+ARCFOUR cipher (based on a cipher posted on the Usenet in Spring-95).
+This cipher is widely believed and has been tested to be equivalent
+with the RC4 cipher from RSA Data Security, Inc. (RC4 is a trademark
+of RSA Data Security)
+
+*/
+#ifndef ARCFOUR_INT_H
+#define ARCFOUR_INT_H
+
+#include "arcfour.h"
+#include <openssl/evp.h>
+
+#define CONFOUNDERLENGTH 8
+
+typedef struct
+{
+ EVP_CIPHER_CTX evp_ctx;
+ unsigned int x;
+ unsigned int y;
+ unsigned char state[256];
+
+} ArcfourContext;
+
+typedef struct {
+ int initialized;
+ ArcfourContext ctx;
+} ArcFourCipherState;
+
+krb5_keyusage krb5int_arcfour_translate_usage(krb5_keyusage usage);
+
+extern const char *const krb5int_arcfour_l40;
+
+#endif /* ARCFOUR_INT_H */
--- /dev/null
+/*
+
+ARCFOUR cipher (based on a cipher posted on the Usenet in Spring-95).
+This cipher is widely believed and has been tested to be equivalent
+with the RC4 cipher from RSA Data Security, Inc. (RC4 is a trademark
+of RSA Data Security)
+
+*/
+#include "k5-int.h"
+#include "arcfour-int.h"
+#include "hash_provider/hash_provider.h"
+
+const char *const krb5int_arcfour_l40 = "fortybits";
+
+void
+krb5_arcfour_encrypt_length(const struct krb5_enc_provider *enc,
+ const struct krb5_hash_provider *hash,
+ size_t inputlen, size_t *length)
+{
+ size_t blocksize, hashsize;
+
+ blocksize = enc->block_size;
+ hashsize = hash->hashsize;
+
+ /* checksum + (confounder + inputlen, in even blocksize) */
+ *length = hashsize + krb5_roundup(8 + inputlen, blocksize);
+}
+
+ krb5_keyusage
+ krb5int_arcfour_translate_usage(krb5_keyusage usage)
+{
+ switch (usage) {
+ case 1: /* AS-REQ PA-ENC-TIMESTAMP padata timestamp, */
+ return 1;
+ case 2: /* ticket from kdc */
+ return 2;
+ case 3: /* as-rep encrypted part */
+ return 8;
+ case 4: /* tgs-req authz data */
+ return 4;
+ case 5: /* tgs-req authz data in subkey */
+ return 5;
+ case 6: /* tgs-req authenticator cksum */
+ return 6;
+case 7: /* tgs-req authenticator */
+ return 7;
+ case 8:
+ return 8;
+ case 9: /* tgs-rep encrypted with subkey */
+ return 9;
+ case 10: /* ap-rep authentication cksum */
+ return 10; /* xxx Microsoft never uses this*/
+ case 11: /* app-req authenticator */
+ return 11;
+ case 12: /* app-rep encrypted part */
+ return 12;
+ case 23: /* sign wrap token*/
+ return 13;
+ default:
+ return usage;
+}
+}
+
+/* RFC 4757 */
+krb5_error_code
+krb5_arcfour_encrypt(const struct krb5_enc_provider *enc,
+ const struct krb5_hash_provider *hash,
+ const krb5_keyblock *key, krb5_keyusage usage,
+ const krb5_data *ivec, const krb5_data *input,
+ krb5_data *output)
+{
+ krb5_keyblock k1, k2, k3;
+ krb5_data d1, d2, d3, salt, plaintext, checksum, ciphertext, confounder;
+ krb5_keyusage ms_usage;
+ size_t keylength, keybytes, blocksize, hashsize;
+ krb5_error_code ret;
+
+ blocksize = enc->block_size;
+ keybytes = enc->keybytes;
+ keylength = enc->keylength;
+ hashsize = hash->hashsize;
+
+ d1.length=keybytes;
+ d1.data=malloc(d1.length);
+ if (d1.data == NULL)
+ return (ENOMEM);
+ k1 = *key;
+ k1.length=d1.length;
+ k1.contents= (void *) d1.data;
+
+ d2.length=keybytes;
+ d2.data=malloc(d2.length);
+ if (d2.data == NULL) {
+ free(d1.data);
+ return (ENOMEM);
+ }
+ k2 = *key;
+ k2.length=d2.length;
+ k2.contents=(void *) d2.data;
+
+ d3.length=keybytes;
+ d3.data=malloc(d3.length);
+ if (d3.data == NULL) {
+ free(d1.data);
+ free(d2.data);
+ return (ENOMEM);
+ }
+ k3 = *key;
+ k3.length=d3.length;
+ k3.contents= (void *) d3.data;
+
+ salt.length=14;
+ salt.data=malloc(salt.length);
+ if (salt.data == NULL) {
+ free(d1.data);
+ free(d2.data);
+ free(d3.data);
+ return (ENOMEM);
+ }
+
+ /* is "input" already blocksize aligned? if it is, then we need this
+ step, otherwise we do not */
+ plaintext.length=krb5_roundup(input->length+CONFOUNDERLENGTH,blocksize);
+ plaintext.data=malloc(plaintext.length);
+ if (plaintext.data == NULL) {
+ free(d1.data);
+ free(d2.data);
+ free(d3.data);
+ free(salt.data);
+ return(ENOMEM);
+ }
+
+ /* setup convienient pointers into the allocated data */
+ checksum.length=hashsize;
+ checksum.data=output->data;
+ ciphertext.length=krb5_roundup(input->length+CONFOUNDERLENGTH,blocksize);
+ ciphertext.data=output->data+hashsize;
+ confounder.length=CONFOUNDERLENGTH;
+ confounder.data=plaintext.data;
+ output->length = plaintext.length+hashsize;
+
+ /* begin the encryption, computer K1 */
+ ms_usage=krb5int_arcfour_translate_usage(usage);
+ if (key->enctype == ENCTYPE_ARCFOUR_HMAC_EXP) {
+ strncpy(salt.data, krb5int_arcfour_l40, salt.length);
+ store_32_le(ms_usage, salt.data+10);
+ } else {
+ salt.length=4;
+ store_32_le(ms_usage, salt.data);
+ }
+ krb5_hmac(hash, key, 1, &salt, &d1);
+
+ memcpy(k2.contents, k1.contents, k2.length);
+
+ if (key->enctype==ENCTYPE_ARCFOUR_HMAC_EXP)
+ memset(k1.contents+7, 0xab, 9);
+
+ ret=krb5_c_random_make_octets(/* XXX */ 0, &confounder);
+ memcpy(plaintext.data+confounder.length, input->data, input->length);
+ if (ret)
+ goto cleanup;
+
+ krb5_hmac(hash, &k2, 1, &plaintext, &checksum);
+
+ krb5_hmac(hash, &k1, 1, &checksum, &d3);
+
+ ret=(*(enc->encrypt))(&k3, ivec, &plaintext, &ciphertext);
+
+ cleanup:
+ memset(d1.data, 0, d1.length);
+ memset(d2.data, 0, d2.length);
+ memset(d3.data, 0, d3.length);
+ memset(salt.data, 0, salt.length);
+ memset(plaintext.data, 0, plaintext.length);
+
+ free(d1.data);
+ free(d2.data);
+ free(d3.data);
+ free(salt.data);
+ free(plaintext.data);
+ return (ret);
+}
+
+/* This is the arcfour-hmac decryption routine */
+krb5_error_code
+krb5_arcfour_decrypt(const struct krb5_enc_provider *enc,
+ const struct krb5_hash_provider *hash,
+ const krb5_keyblock *key, krb5_keyusage usage,
+ const krb5_data *ivec, const krb5_data *input,
+ krb5_data *output)
+{
+ krb5_keyblock k1,k2,k3;
+ krb5_data d1,d2,d3,salt,ciphertext,plaintext,checksum;
+ krb5_keyusage ms_usage;
+ size_t keybytes, keylength, hashsize, blocksize;
+ krb5_error_code ret;
+
+ blocksize = enc->block_size;
+ keybytes = enc->keybytes;
+ keylength = enc->keylength;
+ hashsize = hash->hashsize;
+
+ d1.length=keybytes;
+ d1.data=malloc(d1.length);
+ if (d1.data == NULL)
+ return (ENOMEM);
+ k1 = *key;
+ k1.length=d1.length;
+ k1.contents= (void *) d1.data;
+
+ d2.length=keybytes;
+ d2.data=malloc(d2.length);
+ if (d2.data == NULL) {
+ free(d1.data);
+ return (ENOMEM);
+ }
+ k2 = *key;
+ k2.length=d2.length;
+ k2.contents= (void *) d2.data;
+
+ d3.length=keybytes;
+ d3.data=malloc(d3.length);
+ if (d3.data == NULL) {
+ free(d1.data);
+ free(d2.data);
+ return (ENOMEM);
+ }
+ k3 = *key;
+ k3.length=d3.length;
+ k3.contents= (void *) d3.data;
+
+ salt.length=14;
+ salt.data=malloc(salt.length);
+ if(salt.data==NULL) {
+ free(d1.data);
+ free(d2.data);
+ free(d3.data);
+ return (ENOMEM);
+ }
+
+ ciphertext.length=input->length-hashsize;
+ ciphertext.data=input->data+hashsize;
+ plaintext.length=ciphertext.length;
+ plaintext.data=malloc(plaintext.length);
+ if (plaintext.data == NULL) {
+ free(d1.data);
+ free(d2.data);
+ free(d3.data);
+ free(salt.data);
+ return (ENOMEM);
+ }
+
+ checksum.length=hashsize;
+ checksum.data=input->data;
+
+ ms_usage=krb5int_arcfour_translate_usage(usage);
+
+ /* We may have to try two ms_usage values; see below. */
+ do {
+ /* compute the salt */
+ if (key->enctype == ENCTYPE_ARCFOUR_HMAC_EXP) {
+ strncpy(salt.data, krb5int_arcfour_l40, salt.length);
+ store_32_le(ms_usage, salt.data + 10);
+ } else {
+ salt.length = 4;
+ store_32_le(ms_usage, salt.data);
+ }
+ ret = krb5_hmac(hash, key, 1, &salt, &d1);
+ if (ret)
+ goto cleanup;
+
+ memcpy(k2.contents, k1.contents, k2.length);
+
+ if (key->enctype == ENCTYPE_ARCFOUR_HMAC_EXP)
+ memset(k1.contents + 7, 0xab, 9);
+
+ ret = krb5_hmac(hash, &k1, 1, &checksum, &d3);
+ if (ret)
+ goto cleanup;
+
+ ret = (*(enc->decrypt))(&k3, ivec, &ciphertext, &plaintext);
+ if (ret)
+ goto cleanup;
+
+ ret = krb5_hmac(hash, &k2, 1, &plaintext, &d1);
+ if (ret)
+ goto cleanup;
+
+ if (memcmp(checksum.data, d1.data, hashsize) != 0) {
+ if (ms_usage == 9) {
+ /*
+ * RFC 4757 specifies usage 8 for TGS-REP encrypted
+ * parts encrypted in a subkey, but the value used by MS
+ * is actually 9. We now use 9 to start with, but fall
+ * back to 8 on failure in case we are communicating
+ * with a KDC using the value from the RFC.
+ */
+ ms_usage = 8;
+ continue;
+ }
+ ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
+ goto cleanup;
+ }
+
+ break;
+ } while (1);
+
+ memcpy(output->data, plaintext.data+CONFOUNDERLENGTH,
+ (plaintext.length-CONFOUNDERLENGTH));
+ output->length=plaintext.length-CONFOUNDERLENGTH;
+
+ cleanup:
+ memset(d1.data, 0, d1.length);
+ memset(d2.data, 0, d2.length);
+ memset(d3.data, 0, d2.length);
+ memset(salt.data, 0, salt.length);
+ memset(plaintext.data, 0, plaintext.length);
+
+ free(d1.data);
+ free(d2.data);
+ free(d3.data);
+ free(salt.data);
+ free(plaintext.data);
+ return (ret);
+}
+
--- /dev/null
+#ifndef ARCFOUR_H
+#define ARCFOUR_H
+
+extern void
+krb5_arcfour_encrypt_length(const struct krb5_enc_provider *,
+ const struct krb5_hash_provider *,
+ size_t,
+ size_t *);
+
+extern
+krb5_error_code krb5_arcfour_encrypt(const struct krb5_enc_provider *,
+ const struct krb5_hash_provider *,
+ const krb5_keyblock *,
+ krb5_keyusage,
+ const krb5_data *,
+ const krb5_data *,
+ krb5_data *);
+
+extern
+krb5_error_code krb5_arcfour_decrypt(const struct krb5_enc_provider *,
+ const struct krb5_hash_provider *,
+ const krb5_keyblock *,
+ krb5_keyusage,
+ const krb5_data *,
+ const krb5_data *,
+ krb5_data *);
+
+extern krb5_error_code krb5int_arcfour_string_to_key(
+ const struct krb5_enc_provider *,
+ const krb5_data *,
+ const krb5_data *,
+ const krb5_data *,
+ krb5_keyblock *);
+
+extern const struct krb5_enc_provider krb5int_enc_arcfour;
+extern const struct krb5_aead_provider krb5int_aead_arcfour;
+ krb5_error_code krb5int_arcfour_prf(
+ const struct krb5_enc_provider *enc,
+ const struct krb5_hash_provider *hash,
+ const krb5_keyblock *key,
+ const krb5_data *in, krb5_data *out);
+
+#endif /* ARCFOUR_H */
--- /dev/null
+/*
+ * lib/crypto/arcfour/arcfour_aead.c
+ *
+ * Copyright 2008 by the Massachusetts Institute of Technology.
+ * All Rights Reserved.
+ *
+ * Export of this software from the United States of America may
+ * require a specific license from the United States Government.
+ * It is the responsibility of any person or organization contemplating
+ * export to obtain such a license before exporting.
+ *
+ * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
+ * distribute this software and its documentation for any purpose and
+ * without fee is hereby granted, provided that the above copyright
+ * notice appear in all copies and that both that copyright notice and
+ * this permission notice appear in supporting documentation, and that
+ * the name of M.I.T. not be used in advertising or publicity pertaining
+ * to distribution of the software without specific, written prior
+ * permission. Furthermore if you modify this software you must label
+ * your software as modified software and not distribute it in such a
+ * fashion that it might be confused with the original M.I.T. software.
+ * M.I.T. makes no representations about the suitability of
+ * this software for any purpose. It is provided "as is" without express
+ * or implied warranty.
+ */
+
+
+#include "k5-int.h"
+#include "arcfour.h"
+#include "arcfour-int.h"
+#include "aead.h"
+
+/* AEAD */
+
+static krb5_error_code
+krb5int_arcfour_crypto_length(const struct krb5_aead_provider *aead,
+ const struct krb5_enc_provider *enc,
+ const struct krb5_hash_provider *hash,
+ krb5_cryptotype type,
+ unsigned int *length)
+{
+ switch (type) {
+ case KRB5_CRYPTO_TYPE_HEADER:
+ *length = hash->hashsize + CONFOUNDERLENGTH;
+ break;
+ case KRB5_CRYPTO_TYPE_PADDING:
+ *length = 0;
+ break;
+ case KRB5_CRYPTO_TYPE_TRAILER:
+ *length = 0;
+ break;
+ case KRB5_CRYPTO_TYPE_CHECKSUM:
+ *length = hash->hashsize;
+ break;
+ default:
+ assert(0 && "invalid cryptotype passed to krb5int_arcfour_crypto_length");
+ break;
+ }
+
+ return 0;
+}
+
+static krb5_error_code
+alloc_derived_key(const struct krb5_enc_provider *enc,
+ krb5_keyblock *dst,
+ krb5_data *data,
+ const krb5_keyblock *src)
+{
+ data->length = enc->keybytes;
+ data->data = malloc(data->length);
+ if (data->data == NULL)
+ return ENOMEM;
+
+ *dst = *src;
+ dst->length = data->length;
+ dst->contents = (void *)data->data;
+
+ return 0;
+}
+
+static krb5_error_code
+krb5int_arcfour_encrypt_iov(const struct krb5_aead_provider *aead,
+ const struct krb5_enc_provider *enc,
+ const struct krb5_hash_provider *hash,
+ const krb5_keyblock *key,
+ krb5_keyusage usage,
+ const krb5_data *ivec,
+ krb5_crypto_iov *data,
+ size_t num_data)
+{
+ krb5_error_code ret;
+ krb5_crypto_iov *header, *trailer;
+ krb5_keyblock k1, k2, k3;
+ krb5_data d1, d2, d3;
+ krb5_data checksum, confounder, header_data;
+ krb5_keyusage ms_usage;
+ char salt_data[14];
+ krb5_data salt;
+ size_t i;
+
+ d1.length = d2.length = d3.length = 0;
+ d1.data = d2.data = d3.data = NULL;
+
+ /*
+ * Caller must have provided space for the header, padding
+ * and trailer; per RFC 4757 we will arrange it as:
+ *
+ * Checksum | E(Confounder | Plaintext)
+ */
+
+ header = krb5int_c_locate_iov(data, num_data, KRB5_CRYPTO_TYPE_HEADER);
+ if (header == NULL ||
+ header->data.length < hash->hashsize + CONFOUNDERLENGTH)
+ return KRB5_BAD_MSIZE;
+
+ header_data = header->data;
+
+ /* Trailer may be absent */
+ trailer = krb5int_c_locate_iov(data, num_data, KRB5_CRYPTO_TYPE_TRAILER);
+ if (trailer != NULL)
+ trailer->data.length = 0;
+
+ /* Ensure that there is no padding */
+ for (i = 0; i < num_data; i++) {
+ if (data[i].flags == KRB5_CRYPTO_TYPE_PADDING)
+ data[i].data.length = 0;
+ }
+
+ ret = alloc_derived_key(enc, &k1, &d1, key);
+ if (ret != 0)
+ goto cleanup;
+
+ ret = alloc_derived_key(enc, &k2, &d2, key);
+ if (ret != 0)
+ goto cleanup;
+
+ ret = alloc_derived_key(enc, &k3, &d3, key);
+ if (ret != 0)
+ goto cleanup;
+
+ /* Begin the encryption, compute K1 */
+ salt.data = salt_data;
+ salt.length = sizeof(salt_data);
+
+ ms_usage = krb5int_arcfour_translate_usage(usage);
+
+ if (key->enctype == ENCTYPE_ARCFOUR_HMAC_EXP) {
+ strncpy(salt.data, krb5int_arcfour_l40, salt.length);
+ store_32_le(ms_usage, salt.data + 10);
+ } else {
+ salt.length = 4;
+ store_32_le(ms_usage, salt.data);
+ }
+ ret = krb5_hmac(hash, key, 1, &salt, &d1);
+ if (ret != 0)
+ goto cleanup;
+
+ memcpy(k2.contents, k1.contents, k2.length);
+
+ if (key->enctype == ENCTYPE_ARCFOUR_HMAC_EXP)
+ memset(k1.contents + 7, 0xAB, 9);
+
+ header->data.length = hash->hashsize + CONFOUNDERLENGTH;
+
+ confounder.data = header->data.data + hash->hashsize;
+ confounder.length = CONFOUNDERLENGTH;
+
+ ret = krb5_c_random_make_octets(0, &confounder);
+ if (ret != 0)
+ goto cleanup;
+
+ checksum.data = header->data.data;
+ checksum.length = hash->hashsize;
+
+ /* Adjust pointers so confounder is at start of header */
+ header->data.length -= hash->hashsize;
+ header->data.data += hash->hashsize;
+
+ ret = krb5int_hmac_iov(hash, &k2, data, num_data, &checksum);
+ if (ret != 0)
+ goto cleanup;
+
+ ret = krb5_hmac(hash, &k1, 1, &checksum, &d3);
+ if (ret != 0)
+ goto cleanup;
+
+ ret = enc->encrypt_iov(&k3, ivec, data, num_data);
+ if (ret != 0)
+ goto cleanup;
+
+cleanup:
+ header->data = header_data; /* restore header pointers */
+
+ if (d1.data != NULL) {
+ memset(d1.data, 0, d1.length);
+ free(d1.data);
+ }
+ if (d2.data != NULL) {
+ memset(d2.data, 0, d2.length);
+ free(d2.data);
+ }
+ if (d3.data != NULL) {
+ memset(d3.data, 0, d3.length);
+ free(d3.data);
+ }
+
+ return ret;
+}
+
+static krb5_error_code
+krb5int_arcfour_decrypt_iov(const struct krb5_aead_provider *aead,
+ const struct krb5_enc_provider *enc,
+ const struct krb5_hash_provider *hash,
+ const krb5_keyblock *key,
+ krb5_keyusage usage,
+ const krb5_data *ivec,
+ krb5_crypto_iov *data,
+ size_t num_data)
+{
+ krb5_error_code ret;
+ krb5_crypto_iov *header, *trailer;
+ krb5_keyblock k1, k2, k3;
+ krb5_data d1, d2, d3;
+ krb5_data checksum, header_data;
+ krb5_keyusage ms_usage;
+ char salt_data[14];
+ krb5_data salt;
+
+ d1.length = d2.length = d3.length = 0;
+ d1.data = d2.data = d3.data = NULL;
+
+ header = krb5int_c_locate_iov(data, num_data, KRB5_CRYPTO_TYPE_HEADER);
+ if (header == NULL ||
+ header->data.length != hash->hashsize + CONFOUNDERLENGTH)
+ return KRB5_BAD_MSIZE;
+
+ header_data = header->data;
+
+ trailer = krb5int_c_locate_iov(data, num_data, KRB5_CRYPTO_TYPE_TRAILER);
+ if (trailer != NULL && trailer->data.length != 0)
+ return KRB5_BAD_MSIZE;
+
+ ret = alloc_derived_key(enc, &k1, &d1, key);
+ if (ret != 0)
+ goto cleanup;
+
+ ret = alloc_derived_key(enc, &k2, &d2, key);
+ if (ret != 0)
+ goto cleanup;
+
+ ret = alloc_derived_key(enc, &k3, &d3, key);
+ if (ret != 0)
+ goto cleanup;
+
+ /* Begin the decryption, compute K1 */
+ salt.data = salt_data;
+ salt.length = sizeof(salt_data);
+
+ ms_usage = krb5int_arcfour_translate_usage(usage);
+
+ if (key->enctype == ENCTYPE_ARCFOUR_HMAC_EXP) {
+ strncpy(salt.data, krb5int_arcfour_l40, salt.length);
+ store_32_le(ms_usage, (unsigned char *)salt.data + 10);
+ } else {
+ salt.length = 4;
+ store_32_le(ms_usage, (unsigned char *)salt.data);
+ }
+ ret = krb5_hmac(hash, key, 1, &salt, &d1);
+ if (ret != 0)
+ goto cleanup;
+
+ memcpy(k2.contents, k1.contents, k2.length);
+
+ if (key->enctype == ENCTYPE_ARCFOUR_HMAC_EXP)
+ memset(k1.contents + 7, 0xAB, 9);
+
+ checksum.data = header->data.data;
+ checksum.length = hash->hashsize;
+
+ /* Adjust pointers so confounder is at start of header */
+ header->data.length -= hash->hashsize;
+ header->data.data += hash->hashsize;
+
+ ret = krb5_hmac(hash, &k1, 1, &checksum, &d3);
+ if (ret != 0)
+ goto cleanup;
+
+ ret = enc->decrypt_iov(&k3, ivec, data, num_data);
+ if (ret != 0)
+ goto cleanup;
+
+ ret = krb5int_hmac_iov(hash, &k2, data, num_data, &d1);
+ if (ret != 0)
+ goto cleanup;
+
+ if (memcmp(checksum.data, d1.data, hash->hashsize) != 0) {
+ ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
+ goto cleanup;
+ }
+
+cleanup:
+ header->data = header_data; /* restore header pointers */
+
+ if (d1.data != NULL) {
+ memset(d1.data, 0, d1.length);
+ free(d1.data);
+ }
+ if (d2.data != NULL) {
+ memset(d2.data, 0, d2.length);
+ free(d2.data);
+ }
+ if (d3.data != NULL) {
+ memset(d3.data, 0, d3.length);
+ free(d3.data);
+ }
+
+ return ret;
+}
+
+const struct krb5_aead_provider krb5int_aead_arcfour = {
+ krb5int_arcfour_crypto_length,
+ krb5int_arcfour_encrypt_iov,
+ krb5int_arcfour_decrypt_iov
+};
+
--- /dev/null
+#include "k5-int.h"
+#include "k5-utf8.h"
+#include "rsa-md4.h"
+#include "arcfour-int.h"
+
+#if TARGET_OS_MAC && !defined(DEPEND)
+#include <CoreFoundation/CFString.h>
+#endif
+
+krb5_error_code
+krb5int_arcfour_string_to_key(const struct krb5_enc_provider *enc,
+ const krb5_data *string, const krb5_data *salt,
+ const krb5_data *params, krb5_keyblock *key)
+{
+ krb5_error_code err = 0;
+ krb5_MD4_CTX md4_context;
+ unsigned char *copystr;
+ size_t copystrlen;
+
+ if (params != NULL)
+ return KRB5_ERR_BAD_S2K_PARAMS;
+
+ if (key->length != 16)
+ return (KRB5_BAD_MSIZE);
+
+ /* We ignore salt per the Microsoft spec*/
+
+ /* compute the space needed for the new string.
+ Since the password must be stored in unicode, we need to increase
+ that number by 2x.
+ */
+
+ err = krb5int_utf8cs_to_ucs2les(string->data, string->length, ©str, ©strlen);
+ if (err)
+ return err;
+
+ /* the actual MD4 hash of the data */
+ krb5_MD4Init(&md4_context);
+ krb5_MD4Update(&md4_context, copystr, copystrlen);
+ krb5_MD4Final(&md4_context);
+ memcpy(key->contents, md4_context.digest, 16);
+
+#if 0
+ /* test the string_to_key function */
+ printf("Hash=");
+ {
+ int counter;
+ for(counter=0;counter<16;counter++)
+ printf("%02x", md4_context.digest[counter]);
+ printf("\n");
+ }
+#endif /* 0 */
+
+ /* Zero out the data behind us */
+ memset(copystr, 0, copystrlen);
+ memset(&md4_context, 0, sizeof(md4_context));
+ free(copystr);
+ return err;
+}
projects / krb5.git / commitdiff