1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * AES CBC 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/internal/skcipher.h>
12#include <linux/err.h>
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/spinlock.h>
16#include <linux/string.h>
17#include <asm/vio.h>
18
19#include "nx_csbcpb.h"
20#include "nx.h"
21
22
23static int cbc_aes_nx_set_key(struct crypto_skcipher *tfm,
24 const u8 *in_key,
25 unsigned int key_len)
26{
27 struct nx_crypto_ctx *nx_ctx = crypto_skcipher_ctx(tfm);
28 struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
29
30 nx_ctx_init(nx_ctx, HCOP_FC_AES);
31
32 switch (key_len) {
33 case AES_KEYSIZE_128:
34 NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_128);
35 nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_128];
36 break;
37 case AES_KEYSIZE_192:
38 NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_192);
39 nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_192];
40 break;
41 case AES_KEYSIZE_256:
42 NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_256);
43 nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_256];
44 break;
45 default:
46 return -EINVAL;
47 }
48
49 csbcpb->cpb.hdr.mode = NX_MODE_AES_CBC;
50 memcpy(csbcpb->cpb.aes_cbc.key, in_key, key_len);
51
52 return 0;
53}
54
55static int cbc_aes_nx_crypt(struct skcipher_request *req,
56 int enc)
57{
58 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
59 struct nx_crypto_ctx *nx_ctx = crypto_skcipher_ctx(tfm);
60 struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
61 unsigned long irq_flags;
62 unsigned int processed = 0, to_process;
63 int rc;
64
65 spin_lock_irqsave(&nx_ctx->lock, irq_flags);
66
67 if (enc)
68 NX_CPB_FDM(csbcpb) |= NX_FDM_ENDE_ENCRYPT;
69 else
70 NX_CPB_FDM(csbcpb) &= ~NX_FDM_ENDE_ENCRYPT;
71
72 do {
73 to_process = req->cryptlen - processed;
74
75 rc = nx_build_sg_lists(nx_ctx, iv: req->iv, dst: req->dst, src: req->src,
76 nbytes: &to_process, offset: processed,
77 oiv: csbcpb->cpb.aes_cbc.iv);
78 if (rc)
79 goto out;
80
81 if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {
82 rc = -EINVAL;
83 goto out;
84 }
85
86 rc = nx_hcall_sync(ctx: nx_ctx, op: &nx_ctx->op,
87 may_sleep: req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
88 if (rc)
89 goto out;
90
91 memcpy(req->iv, csbcpb->cpb.aes_cbc.cv, AES_BLOCK_SIZE);
92 atomic_inc(v: &(nx_ctx->stats->aes_ops));
93 atomic64_add(be32_to_cpu(csbcpb->csb.processed_byte_count),
94 v: &(nx_ctx->stats->aes_bytes));
95
96 processed += to_process;
97 } while (processed < req->cryptlen);
98out:
99 spin_unlock_irqrestore(lock: &nx_ctx->lock, flags: irq_flags);
100 return rc;
101}
102
103static int cbc_aes_nx_encrypt(struct skcipher_request *req)
104{
105 return cbc_aes_nx_crypt(req, enc: 1);
106}
107
108static int cbc_aes_nx_decrypt(struct skcipher_request *req)
109{
110 return cbc_aes_nx_crypt(req, enc: 0);
111}
112
113struct skcipher_alg nx_cbc_aes_alg = {
114 .base.cra_name = "cbc(aes)",
115 .base.cra_driver_name = "cbc-aes-nx",
116 .base.cra_priority = 300,
117 .base.cra_blocksize = AES_BLOCK_SIZE,
118 .base.cra_ctxsize = sizeof(struct nx_crypto_ctx),
119 .base.cra_alignmask = 0xf,
120 .base.cra_module = THIS_MODULE,
121 .init = nx_crypto_ctx_aes_cbc_init,
122 .exit = nx_crypto_ctx_skcipher_exit,
123 .min_keysize = AES_MIN_KEY_SIZE,
124 .max_keysize = AES_MAX_KEY_SIZE,
125 .ivsize = AES_BLOCK_SIZE,
126 .setkey = cbc_aes_nx_set_key,
127 .encrypt = cbc_aes_nx_encrypt,
128 .decrypt = cbc_aes_nx_decrypt,
129};
130

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source code of linux/drivers/crypto/nx/nx-aes-cbc.c