^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * geniv: Shared IV generator code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * This file provides common code to IV generators such as seqiv.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Copyright (c) 2007-2019 Herbert Xu <herbert@gondor.apana.org.au>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <crypto/internal/geniv.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <crypto/internal/rng.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <crypto/null.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/rtnetlink.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) static int aead_geniv_setkey(struct crypto_aead *tfm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) const u8 *key, unsigned int keylen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) return crypto_aead_setkey(ctx->child, key, keylen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) static int aead_geniv_setauthsize(struct crypto_aead *tfm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) unsigned int authsize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) return crypto_aead_setauthsize(ctx->child, authsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) static void aead_geniv_free(struct aead_instance *inst)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) crypto_drop_aead(aead_instance_ctx(inst));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) kfree(inst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) struct aead_instance *aead_geniv_alloc(struct crypto_template *tmpl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) struct rtattr **tb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) struct crypto_aead_spawn *spawn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) struct aead_instance *inst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) struct aead_alg *alg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) unsigned int ivsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) unsigned int maxauthsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) u32 mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) return ERR_PTR(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) if (!inst)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) spawn = aead_instance_ctx(inst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) err = crypto_grab_aead(spawn, aead_crypto_instance(inst),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) crypto_attr_alg_name(tb[1]), 0, mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) goto err_free_inst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) alg = crypto_spawn_aead_alg(spawn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) ivsize = crypto_aead_alg_ivsize(alg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) maxauthsize = crypto_aead_alg_maxauthsize(alg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) if (ivsize < sizeof(u64))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) goto err_free_inst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) err = -ENAMETOOLONG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) "%s(%s)", tmpl->name, alg->base.cra_name) >=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) CRYPTO_MAX_ALG_NAME)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) goto err_free_inst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) "%s(%s)", tmpl->name, alg->base.cra_driver_name) >=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) CRYPTO_MAX_ALG_NAME)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) goto err_free_inst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) inst->alg.base.cra_priority = alg->base.cra_priority;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) inst->alg.base.cra_blocksize = alg->base.cra_blocksize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) inst->alg.base.cra_ctxsize = sizeof(struct aead_geniv_ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) inst->alg.setkey = aead_geniv_setkey;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) inst->alg.setauthsize = aead_geniv_setauthsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) inst->alg.ivsize = ivsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) inst->alg.maxauthsize = maxauthsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) inst->free = aead_geniv_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) return inst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) err_free_inst:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) aead_geniv_free(inst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) inst = ERR_PTR(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) EXPORT_SYMBOL_GPL(aead_geniv_alloc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) int aead_init_geniv(struct crypto_aead *aead)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) struct aead_geniv_ctx *ctx = crypto_aead_ctx(aead);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) struct aead_instance *inst = aead_alg_instance(aead);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) struct crypto_aead *child;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) spin_lock_init(&ctx->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) err = crypto_get_default_rng();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) crypto_aead_ivsize(aead));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) crypto_put_default_rng();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) ctx->sknull = crypto_get_default_null_skcipher();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) err = PTR_ERR(ctx->sknull);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) if (IS_ERR(ctx->sknull))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) child = crypto_spawn_aead(aead_instance_ctx(inst));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) err = PTR_ERR(child);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) if (IS_ERR(child))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) goto drop_null;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) ctx->child = child;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) crypto_aead_set_reqsize(aead, crypto_aead_reqsize(child) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) sizeof(struct aead_request));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) drop_null:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) crypto_put_default_null_skcipher();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) EXPORT_SYMBOL_GPL(aead_init_geniv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) void aead_exit_geniv(struct crypto_aead *tfm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) crypto_free_aead(ctx->child);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) crypto_put_default_null_skcipher();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) EXPORT_SYMBOL_GPL(aead_exit_geniv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) MODULE_DESCRIPTION("Shared IV generator code");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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