1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * AES CTR routines supporting the Power 7+ Nest Accelerators driver
4 *
5 * Copyright (C) 2011-2012 International Business Machines Inc.
6 *
7 * Author: Kent Yoder <yoder1@us.ibm.com>
8 */
9
10 #include <crypto/aes.h>
11 #include <crypto/ctr.h>
12 #include <crypto/internal/skcipher.h>
13 #include <linux/err.h>
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/spinlock.h>
17 #include <linux/string.h>
18 #include <asm/vio.h>
19
20 #include "nx_csbcpb.h"
21 #include "nx.h"
22
23
ctr_aes_nx_set_key(struct crypto_skcipher * tfm,const u8 * in_key,unsigned int key_len)24 static int ctr_aes_nx_set_key(struct crypto_skcipher *tfm,
25 const u8 *in_key,
26 unsigned int key_len)
27 {
28 struct nx_crypto_ctx *nx_ctx = crypto_skcipher_ctx(tfm);
29 struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
30
31 nx_ctx_init(nx_ctx, HCOP_FC_AES);
32
33 switch (key_len) {
34 case AES_KEYSIZE_128:
35 NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_128);
36 nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_128];
37 break;
38 case AES_KEYSIZE_192:
39 NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_192);
40 nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_192];
41 break;
42 case AES_KEYSIZE_256:
43 NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_256);
44 nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_256];
45 break;
46 default:
47 return -EINVAL;
48 }
49
50 csbcpb->cpb.hdr.mode = NX_MODE_AES_CTR;
51 memcpy(csbcpb->cpb.aes_ctr.key, in_key, key_len);
52
53 return 0;
54 }
55
ctr3686_aes_nx_set_key(struct crypto_skcipher * tfm,const u8 * in_key,unsigned int key_len)56 static int ctr3686_aes_nx_set_key(struct crypto_skcipher *tfm,
57 const u8 *in_key,
58 unsigned int key_len)
59 {
60 struct nx_crypto_ctx *nx_ctx = crypto_skcipher_ctx(tfm);
61
62 if (key_len < CTR_RFC3686_NONCE_SIZE)
63 return -EINVAL;
64
65 memcpy(nx_ctx->priv.ctr.nonce,
66 in_key + key_len - CTR_RFC3686_NONCE_SIZE,
67 CTR_RFC3686_NONCE_SIZE);
68
69 key_len -= CTR_RFC3686_NONCE_SIZE;
70
71 return ctr_aes_nx_set_key(tfm, in_key, key_len);
72 }
73
ctr_aes_nx_crypt(struct skcipher_request * req,u8 * iv)74 static int ctr_aes_nx_crypt(struct skcipher_request *req, u8 *iv)
75 {
76 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
77 struct nx_crypto_ctx *nx_ctx = crypto_skcipher_ctx(tfm);
78 struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
79 unsigned long irq_flags;
80 unsigned int processed = 0, to_process;
81 int rc;
82
83 spin_lock_irqsave(&nx_ctx->lock, irq_flags);
84
85 do {
86 to_process = req->cryptlen - processed;
87
88 rc = nx_build_sg_lists(nx_ctx, iv, req->dst, req->src,
89 &to_process, processed,
90 csbcpb->cpb.aes_ctr.iv);
91 if (rc)
92 goto out;
93
94 if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {
95 rc = -EINVAL;
96 goto out;
97 }
98
99 rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
100 req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
101 if (rc)
102 goto out;
103
104 memcpy(iv, csbcpb->cpb.aes_cbc.cv, AES_BLOCK_SIZE);
105
106 atomic_inc(&(nx_ctx->stats->aes_ops));
107 atomic64_add(be32_to_cpu(csbcpb->csb.processed_byte_count),
108 &(nx_ctx->stats->aes_bytes));
109
110 processed += to_process;
111 } while (processed < req->cryptlen);
112 out:
113 spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
114 return rc;
115 }
116
ctr3686_aes_nx_crypt(struct skcipher_request * req)117 static int ctr3686_aes_nx_crypt(struct skcipher_request *req)
118 {
119 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
120 struct nx_crypto_ctx *nx_ctx = crypto_skcipher_ctx(tfm);
121 u8 iv[16];
122
123 memcpy(iv, nx_ctx->priv.ctr.nonce, CTR_RFC3686_NONCE_SIZE);
124 memcpy(iv + CTR_RFC3686_NONCE_SIZE, req->iv, CTR_RFC3686_IV_SIZE);
125 iv[12] = iv[13] = iv[14] = 0;
126 iv[15] = 1;
127
128 return ctr_aes_nx_crypt(req, iv);
129 }
130
131 struct skcipher_alg nx_ctr3686_aes_alg = {
132 .base.cra_name = "rfc3686(ctr(aes))",
133 .base.cra_driver_name = "rfc3686-ctr-aes-nx",
134 .base.cra_priority = 300,
135 .base.cra_blocksize = 1,
136 .base.cra_ctxsize = sizeof(struct nx_crypto_ctx),
137 .base.cra_module = THIS_MODULE,
138 .init = nx_crypto_ctx_aes_ctr_init,
139 .exit = nx_crypto_ctx_skcipher_exit,
140 .min_keysize = AES_MIN_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
141 .max_keysize = AES_MAX_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
142 .ivsize = CTR_RFC3686_IV_SIZE,
143 .setkey = ctr3686_aes_nx_set_key,
144 .encrypt = ctr3686_aes_nx_crypt,
145 .decrypt = ctr3686_aes_nx_crypt,
146 .chunksize = AES_BLOCK_SIZE,
147 };
148