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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Crypto API support for AES block cipher
*
* Copyright 2026 Google LLC
*/
#include <crypto/aes-cbc-macs.h>
#include <crypto/aes.h>
#include <crypto/algapi.h>
#include <crypto/internal/hash.h>
#include <linux/module.h>
static_assert(__alignof__(struct aes_key) <= CRYPTO_MINALIGN);
static int crypto_aes_setkey(struct crypto_tfm *tfm, const u8 *in_key,
unsigned int key_len)
{
struct aes_key *key = crypto_tfm_ctx(tfm);
return aes_preparekey(key, in_key, key_len);
}
static void crypto_aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
const struct aes_key *key = crypto_tfm_ctx(tfm);
aes_encrypt(key, out, in);
}
static void crypto_aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
const struct aes_key *key = crypto_tfm_ctx(tfm);
aes_decrypt(key, out, in);
}
static_assert(__alignof__(struct aes_cmac_key) <= CRYPTO_MINALIGN);
#define AES_CMAC_KEY(tfm) ((struct aes_cmac_key *)crypto_shash_ctx(tfm))
#define AES_CMAC_CTX(desc) ((struct aes_cmac_ctx *)shash_desc_ctx(desc))
static int __maybe_unused crypto_aes_cmac_setkey(struct crypto_shash *tfm,
const u8 *in_key,
unsigned int key_len)
{
return aes_cmac_preparekey(AES_CMAC_KEY(tfm), in_key, key_len);
}
static int __maybe_unused crypto_aes_xcbc_setkey(struct crypto_shash *tfm,
const u8 *in_key,
unsigned int key_len)
{
if (key_len != AES_KEYSIZE_128)
return -EINVAL;
aes_xcbcmac_preparekey(AES_CMAC_KEY(tfm), in_key);
return 0;
}
static int __maybe_unused crypto_aes_cmac_init(struct shash_desc *desc)
{
aes_cmac_init(AES_CMAC_CTX(desc), AES_CMAC_KEY(desc->tfm));
return 0;
}
static int __maybe_unused crypto_aes_cmac_update(struct shash_desc *desc,
const u8 *data,
unsigned int len)
{
aes_cmac_update(AES_CMAC_CTX(desc), data, len);
return 0;
}
static int __maybe_unused crypto_aes_cmac_final(struct shash_desc *desc,
u8 *out)
{
aes_cmac_final(AES_CMAC_CTX(desc), out);
return 0;
}
static int __maybe_unused crypto_aes_cmac_digest(struct shash_desc *desc,
const u8 *data,
unsigned int len, u8 *out)
{
aes_cmac(AES_CMAC_KEY(desc->tfm), data, len, out);
return 0;
}
static_assert(__alignof__(struct aes_enckey) <= CRYPTO_MINALIGN);
#define AES_CBCMAC_KEY(tfm) ((struct aes_enckey *)crypto_shash_ctx(tfm))
#define AES_CBCMAC_CTX(desc) ((struct aes_cbcmac_ctx *)shash_desc_ctx(desc))
static int __maybe_unused crypto_aes_cbcmac_setkey(struct crypto_shash *tfm,
const u8 *in_key,
unsigned int key_len)
{
return aes_prepareenckey(AES_CBCMAC_KEY(tfm), in_key, key_len);
}
static int __maybe_unused crypto_aes_cbcmac_init(struct shash_desc *desc)
{
aes_cbcmac_init(AES_CBCMAC_CTX(desc), AES_CBCMAC_KEY(desc->tfm));
return 0;
}
static int __maybe_unused crypto_aes_cbcmac_update(struct shash_desc *desc,
const u8 *data,
unsigned int len)
{
aes_cbcmac_update(AES_CBCMAC_CTX(desc), data, len);
return 0;
}
static int __maybe_unused crypto_aes_cbcmac_final(struct shash_desc *desc,
u8 *out)
{
aes_cbcmac_final(AES_CBCMAC_CTX(desc), out);
return 0;
}
static int __maybe_unused crypto_aes_cbcmac_digest(struct shash_desc *desc,
const u8 *data,
unsigned int len, u8 *out)
{
aes_cbcmac_init(AES_CBCMAC_CTX(desc), AES_CBCMAC_KEY(desc->tfm));
aes_cbcmac_update(AES_CBCMAC_CTX(desc), data, len);
aes_cbcmac_final(AES_CBCMAC_CTX(desc), out);
return 0;
}
static struct crypto_alg alg = {
.cra_name = "aes",
.cra_driver_name = "aes-lib",
.cra_priority = 100,
.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct aes_key),
.cra_module = THIS_MODULE,
.cra_u = { .cipher = { .cia_min_keysize = AES_MIN_KEY_SIZE,
.cia_max_keysize = AES_MAX_KEY_SIZE,
.cia_setkey = crypto_aes_setkey,
.cia_encrypt = crypto_aes_encrypt,
.cia_decrypt = crypto_aes_decrypt } }
};
static struct shash_alg mac_algs[] = {
#if IS_ENABLED(CONFIG_CRYPTO_CMAC)
{
.base.cra_name = "cmac(aes)",
.base.cra_driver_name = "cmac-aes-lib",
.base.cra_priority = 300,
.base.cra_blocksize = AES_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct aes_cmac_key),
.base.cra_module = THIS_MODULE,
.digestsize = AES_BLOCK_SIZE,
.setkey = crypto_aes_cmac_setkey,
.init = crypto_aes_cmac_init,
.update = crypto_aes_cmac_update,
.final = crypto_aes_cmac_final,
.digest = crypto_aes_cmac_digest,
.descsize = sizeof(struct aes_cmac_ctx),
},
#endif
#if IS_ENABLED(CONFIG_CRYPTO_XCBC)
{
/*
* Note that the only difference between xcbc(aes) and cmac(aes)
* is the preparekey function.
*/
.base.cra_name = "xcbc(aes)",
.base.cra_driver_name = "xcbc-aes-lib",
.base.cra_priority = 300,
.base.cra_blocksize = AES_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct aes_cmac_key),
.base.cra_module = THIS_MODULE,
.digestsize = AES_BLOCK_SIZE,
.setkey = crypto_aes_xcbc_setkey,
.init = crypto_aes_cmac_init,
.update = crypto_aes_cmac_update,
.final = crypto_aes_cmac_final,
.digest = crypto_aes_cmac_digest,
.descsize = sizeof(struct aes_cmac_ctx),
},
#endif
#if IS_ENABLED(CONFIG_CRYPTO_CCM)
{
.base.cra_name = "cbcmac(aes)",
.base.cra_driver_name = "cbcmac-aes-lib",
.base.cra_priority = 300,
.base.cra_blocksize = AES_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct aes_enckey),
.base.cra_module = THIS_MODULE,
.digestsize = AES_BLOCK_SIZE,
.setkey = crypto_aes_cbcmac_setkey,
.init = crypto_aes_cbcmac_init,
.update = crypto_aes_cbcmac_update,
.final = crypto_aes_cbcmac_final,
.digest = crypto_aes_cbcmac_digest,
.descsize = sizeof(struct aes_cbcmac_ctx),
},
#endif
};
static int __init crypto_aes_mod_init(void)
{
int err = crypto_register_alg(&alg);
if (err)
return err;
if (ARRAY_SIZE(mac_algs) > 0) {
err = crypto_register_shashes(mac_algs, ARRAY_SIZE(mac_algs));
if (err)
goto err_unregister_alg;
} /* Else, CONFIG_CRYPTO_HASH might not be enabled. */
return 0;
err_unregister_alg:
crypto_unregister_alg(&alg);
return err;
}
module_init(crypto_aes_mod_init);
static void __exit crypto_aes_mod_exit(void)
{
if (ARRAY_SIZE(mac_algs) > 0)
crypto_unregister_shashes(mac_algs, ARRAY_SIZE(mac_algs));
crypto_unregister_alg(&alg);
}
module_exit(crypto_aes_mod_exit);
MODULE_DESCRIPTION("Crypto API support for AES block cipher");
MODULE_IMPORT_NS("CRYPTO_INTERNAL");
MODULE_LICENSE("GPL");
MODULE_ALIAS_CRYPTO("aes");
MODULE_ALIAS_CRYPTO("aes-lib");
#if IS_ENABLED(CONFIG_CRYPTO_CMAC)
MODULE_ALIAS_CRYPTO("cmac(aes)");
MODULE_ALIAS_CRYPTO("cmac-aes-lib");
#endif
#if IS_ENABLED(CONFIG_CRYPTO_XCBC)
MODULE_ALIAS_CRYPTO("xcbc(aes)");
MODULE_ALIAS_CRYPTO("xcbc-aes-lib");
#endif
#if IS_ENABLED(CONFIG_CRYPTO_CCM)
MODULE_ALIAS_CRYPTO("cbcmac(aes)");
MODULE_ALIAS_CRYPTO("cbcmac-aes-lib");
#endif
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