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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* Kerberos5 crypto internals
*
* Copyright (C) 2025 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*/
#include <linux/scatterlist.h>
#include <crypto/krb5.h>
#include <crypto/hash.h>
#include <crypto/skcipher.h>
/*
* Profile used for key derivation and encryption.
*/
struct krb5_crypto_profile {
/* Pseudo-random function */
int (*calc_PRF)(const struct krb5_enctype *krb5,
const struct krb5_buffer *protocol_key,
const struct krb5_buffer *octet_string,
struct krb5_buffer *result,
gfp_t gfp);
/* Checksum key derivation */
int (*calc_Kc)(const struct krb5_enctype *krb5,
const struct krb5_buffer *TK,
const struct krb5_buffer *usage_constant,
struct krb5_buffer *Kc,
gfp_t gfp);
/* Encryption key derivation */
int (*calc_Ke)(const struct krb5_enctype *krb5,
const struct krb5_buffer *TK,
const struct krb5_buffer *usage_constant,
struct krb5_buffer *Ke,
gfp_t gfp);
/* Integrity key derivation */
int (*calc_Ki)(const struct krb5_enctype *krb5,
const struct krb5_buffer *TK,
const struct krb5_buffer *usage_constant,
struct krb5_buffer *Ki,
gfp_t gfp);
/* Derive the keys needed for an encryption AEAD object. */
int (*derive_encrypt_keys)(const struct krb5_enctype *krb5,
const struct krb5_buffer *TK,
unsigned int usage,
struct krb5_buffer *setkey,
gfp_t gfp);
/* Directly load the keys needed for an encryption AEAD object. */
int (*load_encrypt_keys)(const struct krb5_enctype *krb5,
const struct krb5_buffer *Ke,
const struct krb5_buffer *Ki,
struct krb5_buffer *setkey,
gfp_t gfp);
/* Derive the key needed for a checksum hash object. */
int (*derive_checksum_key)(const struct krb5_enctype *krb5,
const struct krb5_buffer *TK,
unsigned int usage,
struct krb5_buffer *setkey,
gfp_t gfp);
/* Directly load the keys needed for a checksum hash object. */
int (*load_checksum_key)(const struct krb5_enctype *krb5,
const struct krb5_buffer *Kc,
struct krb5_buffer *setkey,
gfp_t gfp);
/* Encrypt data in-place, inserting confounder and checksum. */
ssize_t (*encrypt)(const struct krb5_enctype *krb5,
struct crypto_aead *aead,
struct scatterlist *sg, unsigned int nr_sg,
size_t sg_len,
size_t data_offset, size_t data_len,
bool preconfounded);
/* Decrypt data in-place, removing confounder and checksum */
int (*decrypt)(const struct krb5_enctype *krb5,
struct crypto_aead *aead,
struct scatterlist *sg, unsigned int nr_sg,
size_t *_offset, size_t *_len);
/* Generate a MIC on part of a packet, inserting the checksum */
ssize_t (*get_mic)(const struct krb5_enctype *krb5,
struct crypto_shash *shash,
const struct krb5_buffer *metadata,
struct scatterlist *sg, unsigned int nr_sg,
size_t sg_len,
size_t data_offset, size_t data_len);
/* Verify the MIC on a piece of data, removing the checksum */
int (*verify_mic)(const struct krb5_enctype *krb5,
struct crypto_shash *shash,
const struct krb5_buffer *metadata,
struct scatterlist *sg, unsigned int nr_sg,
size_t *_offset, size_t *_len);
};
/*
* Crypto size/alignment rounding convenience macros.
*/
#define crypto_roundup(X) ((unsigned int)round_up((X), CRYPTO_MINALIGN))
#define krb5_aead_size(TFM) \
crypto_roundup(sizeof(struct aead_request) + crypto_aead_reqsize(TFM))
#define krb5_aead_ivsize(TFM) \
crypto_roundup(crypto_aead_ivsize(TFM))
#define krb5_shash_size(TFM) \
crypto_roundup(sizeof(struct shash_desc) + crypto_shash_descsize(TFM))
#define krb5_digest_size(TFM) \
crypto_roundup(crypto_shash_digestsize(TFM))
#define round16(x) (((x) + 15) & ~15)
/*
* krb5_api.c
*/
struct crypto_aead *krb5_prepare_encryption(const struct krb5_enctype *krb5,
const struct krb5_buffer *keys,
gfp_t gfp);
struct crypto_shash *krb5_prepare_checksum(const struct krb5_enctype *krb5,
const struct krb5_buffer *Kc,
gfp_t gfp);
/*
* krb5_kdf.c
*/
int krb5_derive_Kc(const struct krb5_enctype *krb5, const struct krb5_buffer *TK,
u32 usage, struct krb5_buffer *key, gfp_t gfp);
int krb5_derive_Ke(const struct krb5_enctype *krb5, const struct krb5_buffer *TK,
u32 usage, struct krb5_buffer *key, gfp_t gfp);
int krb5_derive_Ki(const struct krb5_enctype *krb5, const struct krb5_buffer *TK,
u32 usage, struct krb5_buffer *key, gfp_t gfp);
/*
* rfc3961_simplified.c
*/
extern const struct krb5_crypto_profile rfc3961_simplified_profile;
int crypto_shash_update_sg(struct shash_desc *desc, struct scatterlist *sg,
size_t offset, size_t len);
int authenc_derive_encrypt_keys(const struct krb5_enctype *krb5,
const struct krb5_buffer *TK,
unsigned int usage,
struct krb5_buffer *setkey,
gfp_t gfp);
int authenc_load_encrypt_keys(const struct krb5_enctype *krb5,
const struct krb5_buffer *Ke,
const struct krb5_buffer *Ki,
struct krb5_buffer *setkey,
gfp_t gfp);
int rfc3961_derive_checksum_key(const struct krb5_enctype *krb5,
const struct krb5_buffer *TK,
unsigned int usage,
struct krb5_buffer *setkey,
gfp_t gfp);
int rfc3961_load_checksum_key(const struct krb5_enctype *krb5,
const struct krb5_buffer *Kc,
struct krb5_buffer *setkey,
gfp_t gfp);
ssize_t krb5_aead_encrypt(const struct krb5_enctype *krb5,
struct crypto_aead *aead,
struct scatterlist *sg, unsigned int nr_sg, size_t sg_len,
size_t data_offset, size_t data_len,
bool preconfounded);
int krb5_aead_decrypt(const struct krb5_enctype *krb5,
struct crypto_aead *aead,
struct scatterlist *sg, unsigned int nr_sg,
size_t *_offset, size_t *_len);
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