Implement the aes128-cts-hmac-sha1-96 and aes256-cts-hmac-sha1-96 enctypes
from rfc3962, using the rfc3961 kerberos 5 simplified crypto scheme.
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
---
crypto/krb5/Makefile | 3 +
crypto/krb5/internal.h | 6 ++
crypto/krb5/main.c | 2 +
crypto/krb5/rfc3962_aes.c | 140 +++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 150 insertions(+), 1 deletion(-)
create mode 100644 crypto/krb5/rfc3962_aes.c
diff --git a/crypto/krb5/Makefile b/crypto/krb5/Makefile
index 67824c44aac3..b81e2efac3c8 100644
--- a/crypto/krb5/Makefile
+++ b/crypto/krb5/Makefile
@@ -6,6 +6,7 @@
krb5-y += \
kdf.o \
main.o \
- rfc3961_simplified.o
+ rfc3961_simplified.o \
+ rfc3962_aes.o
obj-$(CONFIG_CRYPTO_KRB5) += krb5.o
diff --git a/crypto/krb5/internal.h b/crypto/krb5/internal.h
index 20b506327491..5d55a574536e 100644
--- a/crypto/krb5/internal.h
+++ b/crypto/krb5/internal.h
@@ -120,3 +120,9 @@ int rfc3961_verify_mic(const struct krb5_enctype *krb5,
struct scatterlist *sg, unsigned nr_sg,
size_t *_offset, size_t *_len,
int *_error_code);
+
+/*
+ * rfc3962_aes.c
+ */
+extern const struct krb5_enctype krb5_aes128_cts_hmac_sha1_96;
+extern const struct krb5_enctype krb5_aes256_cts_hmac_sha1_96;
diff --git a/crypto/krb5/main.c b/crypto/krb5/main.c
index 97b28e40f6d7..bce47580c33f 100644
--- a/crypto/krb5/main.c
+++ b/crypto/krb5/main.c
@@ -18,6 +18,8 @@ MODULE_AUTHOR("Red Hat, Inc.");
MODULE_LICENSE("GPL");
static const struct krb5_enctype *const krb5_supported_enctypes[] = {
+ &krb5_aes128_cts_hmac_sha1_96,
+ &krb5_aes256_cts_hmac_sha1_96,
};
/**
diff --git a/crypto/krb5/rfc3962_aes.c b/crypto/krb5/rfc3962_aes.c
new file mode 100644
index 000000000000..99297a698178
--- /dev/null
+++ b/crypto/krb5/rfc3962_aes.c
@@ -0,0 +1,140 @@
+/* rfc3962 Advanced Encryption Standard (AES) Encryption for Kerberos 5
+ *
+ * Parts borrowed from net/sunrpc/auth_gss/.
+ */
+/*
+ * COPYRIGHT (c) 2008
+ * The Regents of the University of Michigan
+ * ALL RIGHTS RESERVED
+ *
+ * Permission is granted to use, copy, create derivative works
+ * and redistribute this software and such derivative works
+ * for any purpose, so long as the name of The University of
+ * Michigan is not used in any advertising or publicity
+ * pertaining to the use of distribution of this software
+ * without specific, written prior authorization. If the
+ * above copyright notice or any other identification of the
+ * University of Michigan is included in any copy of any
+ * portion of this software, then the disclaimer below must
+ * also be included.
+ *
+ * THIS SOFTWARE IS PROVIDED AS IS, WITHOUT REPRESENTATION
+ * FROM THE UNIVERSITY OF MICHIGAN AS TO ITS FITNESS FOR ANY
+ * PURPOSE, AND WITHOUT WARRANTY BY THE UNIVERSITY OF
+ * MICHIGAN OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING
+ * WITHOUT LIMITATION THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
+ * REGENTS OF THE UNIVERSITY OF MICHIGAN SHALL NOT BE LIABLE
+ * FOR ANY DAMAGES, INCLUDING SPECIAL, INDIRECT, INCIDENTAL, OR
+ * CONSEQUENTIAL DAMAGES, WITH RESPECT TO ANY CLAIM ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OF THE SOFTWARE, EVEN
+ * IF IT HAS BEEN OR IS HEREAFTER ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGES.
+ */
+
+/*
+ * Copyright (C) 1998 by the FundsXpress, INC.
+ *
+ * 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 FundsXpress. not be used in advertising or publicity pertaining
+ * to distribution of the software without specific, written prior
+ * permission. FundsXpress makes no representations about the suitability of
+ * this software for any purpose. It is provided "as is" without express
+ * or implied warranty.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+/*
+ * RxGK bits:
+ * Copyright (C) 2020 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@xxxxxxxxxx)
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <crypto/skcipher.h>
+#include <crypto/hash.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/key-type.h>
+#include <linux/slab.h>
+#include <linux/lcm.h>
+#include <linux/ctype.h>
+#include "internal.h"
+
+/*
+ * AES random-to-key function. For AES, this is an identity operation.
+ */
+static int rfc3962_random_to_key(const struct krb5_enctype *krb5,
+ const struct krb5_buffer *randombits,
+ struct krb5_buffer *result)
+{
+ if (randombits->len != 16 && randombits->len != 32)
+ return -EINVAL;
+
+ if (result->len != randombits->len)
+ return -EINVAL;
+
+ memcpy(result->data, randombits->data, randombits->len);
+ return 0;
+}
+
+const struct krb5_enctype krb5_aes128_cts_hmac_sha1_96 = {
+ .etype = KRB5_ENCTYPE_AES128_CTS_HMAC_SHA1_96,
+ .ctype = KRB5_CKSUMTYPE_HMAC_SHA1_96_AES128,
+ .name = "aes128-cts-hmac-sha1-96",
+ .encrypt_name = "cts(cbc(aes))",
+ .cksum_name = "hmac(sha1)",
+ .hash_name = "sha1",
+ .key_bytes = 16,
+ .key_len = 16,
+ .Kc_len = 16,
+ .Ke_len = 16,
+ .Ki_len = 16,
+ .block_len = 16,
+ .conf_len = 16,
+ .cksum_len = 12,
+ .hash_len = 20,
+ .prf_len = 16,
+ .keyed_cksum = true,
+ .pad = true,
+ .random_to_key = rfc3962_random_to_key,
+ .profile = &rfc3961_simplified_profile,
+};
+
+const struct krb5_enctype krb5_aes256_cts_hmac_sha1_96 = {
+ .etype = KRB5_ENCTYPE_AES256_CTS_HMAC_SHA1_96,
+ .ctype = KRB5_CKSUMTYPE_HMAC_SHA1_96_AES256,
+ .name = "aes256-cts-hmac-sha1-96",
+ .encrypt_name = "cts(cbc(aes))",
+ .cksum_name = "hmac(sha1)",
+ .hash_name = "sha1",
+ .key_bytes = 32,
+ .key_len = 32,
+ .Kc_len = 32,
+ .Ke_len = 32,
+ .Ki_len = 32,
+ .block_len = 16,
+ .conf_len = 16,
+ .cksum_len = 12,
+ .hash_len = 20,
+ .prf_len = 16,
+ .keyed_cksum = true,
+ .pad = true,
+ .random_to_key = rfc3962_random_to_key,
+ .profile = &rfc3961_simplified_profile,
+};
