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crypto/krb5: Add an API to alloc and prepare a crypto object

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Add an API by which users of the krb5 crypto library can get an allocated
and keyed crypto object.

For encryption-mode operation, an AEAD object is returned; for
checksum-mode operation, a synchronous hash object is returned.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Herbert Xu <herbert@gondor.apana.org.au>
cc: "David S. Miller" <davem@davemloft.net>
cc: Chuck Lever <chuck.lever@oracle.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: Eric Dumazet <edumazet@google.com>
cc: Jakub Kicinski <kuba@kernel.org>
cc: Paolo Abeni <pabeni@redhat.com>
cc: Simon Horman <horms@kernel.org>
cc: linux-afs@lists.infradead.org
cc: linux-nfs@vger.kernel.org
cc: linux-crypto@vger.kernel.org
cc: netdev@vger.kernel.org
This commit is contained in:
David Howells
2025-01-17 13:29:24 +00:00
parent 025ac491f4
commit a9c27d2d87
3 changed files with 161 additions and 0 deletions
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10
crypto/krb5/internal.h
View File

@@ -110,3 +110,13 @@ struct krb5_crypto_profile {
#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);

144
crypto/krb5/krb5_api.c
View File

@@ -148,3 +148,147 @@ void crypto_krb5_where_is_the_data(const struct krb5_enctype *krb5,
}
}
EXPORT_SYMBOL(crypto_krb5_where_is_the_data);
/*
* Prepare the encryption with derived key data.
*/
struct crypto_aead *krb5_prepare_encryption(const struct krb5_enctype *krb5,
const struct krb5_buffer *keys,
gfp_t gfp)
{
struct crypto_aead *ci = NULL;
int ret = -ENOMEM;
ci = crypto_alloc_aead(krb5->encrypt_name, 0, 0);
if (IS_ERR(ci)) {
ret = PTR_ERR(ci);
if (ret == -ENOENT)
ret = -ENOPKG;
goto err;
}
ret = crypto_aead_setkey(ci, keys->data, keys->len);
if (ret < 0) {
pr_err("Couldn't set AEAD key %s: %d\n", krb5->encrypt_name, ret);
goto err_ci;
}
ret = crypto_aead_setauthsize(ci, krb5->cksum_len);
if (ret < 0) {
pr_err("Couldn't set AEAD authsize %s: %d\n", krb5->encrypt_name, ret);
goto err_ci;
}
return ci;
err_ci:
crypto_free_aead(ci);
err:
return ERR_PTR(ret);
}
/**
* crypto_krb5_prepare_encryption - Prepare AEAD crypto object for encryption-mode
* @krb5: The encoding to use.
* @TK: The transport key to use.
* @usage: The usage constant for key derivation.
* @gfp: Allocation flags.
*
* Allocate a crypto object that does all the necessary crypto, key it and set
* its parameters and return the crypto handle to it. This can then be used to
* dispatch encrypt and decrypt operations.
*/
struct crypto_aead *crypto_krb5_prepare_encryption(const struct krb5_enctype *krb5,
const struct krb5_buffer *TK,
u32 usage, gfp_t gfp)
{
struct crypto_aead *ci = NULL;
struct krb5_buffer keys = {};
int ret;
ret = krb5->profile->derive_encrypt_keys(krb5, TK, usage, &keys, gfp);
if (ret < 0)
goto err;
ci = krb5_prepare_encryption(krb5, &keys, gfp);
if (IS_ERR(ci)) {
ret = PTR_ERR(ci);
goto err;
}
kfree(keys.data);
return ci;
err:
kfree(keys.data);
return ERR_PTR(ret);
}
EXPORT_SYMBOL(crypto_krb5_prepare_encryption);
/*
* Prepare the checksum with derived key data.
*/
struct crypto_shash *krb5_prepare_checksum(const struct krb5_enctype *krb5,
const struct krb5_buffer *Kc,
gfp_t gfp)
{
struct crypto_shash *ci = NULL;
int ret = -ENOMEM;
ci = crypto_alloc_shash(krb5->cksum_name, 0, 0);
if (IS_ERR(ci)) {
ret = PTR_ERR(ci);
if (ret == -ENOENT)
ret = -ENOPKG;
goto err;
}
ret = crypto_shash_setkey(ci, Kc->data, Kc->len);
if (ret < 0) {
pr_err("Couldn't set shash key %s: %d\n", krb5->cksum_name, ret);
goto err_ci;
}
return ci;
err_ci:
crypto_free_shash(ci);
err:
return ERR_PTR(ret);
}
/**
* crypto_krb5_prepare_checksum - Prepare AEAD crypto object for checksum-mode
* @krb5: The encoding to use.
* @TK: The transport key to use.
* @usage: The usage constant for key derivation.
* @gfp: Allocation flags.
*
* Allocate a crypto object that does all the necessary crypto, key it and set
* its parameters and return the crypto handle to it. This can then be used to
* dispatch get_mic and verify_mic operations.
*/
struct crypto_shash *crypto_krb5_prepare_checksum(const struct krb5_enctype *krb5,
const struct krb5_buffer *TK,
u32 usage, gfp_t gfp)
{
struct crypto_shash *ci = NULL;
struct krb5_buffer keys = {};
int ret;
ret = krb5->profile->derive_checksum_key(krb5, TK, usage, &keys, gfp);
if (ret < 0) {
pr_err("get_Kc failed %d\n", ret);
goto err;
}
ci = krb5_prepare_checksum(krb5, &keys, gfp);
if (IS_ERR(ci)) {
ret = PTR_ERR(ci);
goto err;
}
kfree(keys.data);
return ci;
err:
kfree(keys.data);
return ERR_PTR(ret);
}
EXPORT_SYMBOL(crypto_krb5_prepare_checksum);

7
include/crypto/krb5.h
View File

@@ -10,6 +10,7 @@
#include <linux/crypto.h>
#include <crypto/aead.h>
#include <crypto/hash.h>
struct crypto_shash;
struct scatterlist;
@@ -110,5 +111,11 @@ size_t crypto_krb5_how_much_data(const struct krb5_enctype *krb5,
void crypto_krb5_where_is_the_data(const struct krb5_enctype *krb5,
enum krb5_crypto_mode mode,
size_t *_offset, size_t *_len);
struct crypto_aead *crypto_krb5_prepare_encryption(const struct krb5_enctype *krb5,
const struct krb5_buffer *TK,
u32 usage, gfp_t gfp);
struct crypto_shash *crypto_krb5_prepare_checksum(const struct krb5_enctype *krb5,
const struct krb5_buffer *TK,
u32 usage, gfp_t gfp);
#endif /* _CRYPTO_KRB5_H */