1 // SPDX-License-Identifier: GPL-2.0-only
3 * AES CBC routines supporting the Power 7+ Nest Accelerators driver
5 * Copyright (C) 2011-2012 International Business Machines Inc.
7 * Author: Kent Yoder <yoder1@us.ibm.com>
10 #include <crypto/aes.h>
11 #include <crypto/algapi.h>
12 #include <linux/module.h>
13 #include <linux/types.h>
14 #include <linux/crypto.h>
17 #include "nx_csbcpb.h"
21 static int cbc_aes_nx_set_key(struct crypto_tfm *tfm,
25 struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(tfm);
26 struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
28 nx_ctx_init(nx_ctx, HCOP_FC_AES);
32 NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_128);
33 nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_128];
36 NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_192);
37 nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_192];
40 NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_256);
41 nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_256];
47 csbcpb->cpb.hdr.mode = NX_MODE_AES_CBC;
48 memcpy(csbcpb->cpb.aes_cbc.key, in_key, key_len);
53 static int cbc_aes_nx_crypt(struct blkcipher_desc *desc,
54 struct scatterlist *dst,
55 struct scatterlist *src,
59 struct nx_crypto_ctx *nx_ctx = crypto_blkcipher_ctx(desc->tfm);
60 struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
61 unsigned long irq_flags;
62 unsigned int processed = 0, to_process;
65 spin_lock_irqsave(&nx_ctx->lock, irq_flags);
68 NX_CPB_FDM(csbcpb) |= NX_FDM_ENDE_ENCRYPT;
70 NX_CPB_FDM(csbcpb) &= ~NX_FDM_ENDE_ENCRYPT;
73 to_process = nbytes - processed;
75 rc = nx_build_sg_lists(nx_ctx, desc, dst, src, &to_process,
76 processed, csbcpb->cpb.aes_cbc.iv);
80 if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {
85 rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
86 desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
90 memcpy(desc->info, csbcpb->cpb.aes_cbc.cv, AES_BLOCK_SIZE);
91 atomic_inc(&(nx_ctx->stats->aes_ops));
92 atomic64_add(csbcpb->csb.processed_byte_count,
93 &(nx_ctx->stats->aes_bytes));
95 processed += to_process;
96 } while (processed < nbytes);
98 spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
102 static int cbc_aes_nx_encrypt(struct blkcipher_desc *desc,
103 struct scatterlist *dst,
104 struct scatterlist *src,
107 return cbc_aes_nx_crypt(desc, dst, src, nbytes, 1);
110 static int cbc_aes_nx_decrypt(struct blkcipher_desc *desc,
111 struct scatterlist *dst,
112 struct scatterlist *src,
115 return cbc_aes_nx_crypt(desc, dst, src, nbytes, 0);
118 struct crypto_alg nx_cbc_aes_alg = {
119 .cra_name = "cbc(aes)",
120 .cra_driver_name = "cbc-aes-nx",
122 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
123 .cra_blocksize = AES_BLOCK_SIZE,
124 .cra_ctxsize = sizeof(struct nx_crypto_ctx),
125 .cra_type = &crypto_blkcipher_type,
126 .cra_alignmask = 0xf,
127 .cra_module = THIS_MODULE,
128 .cra_init = nx_crypto_ctx_aes_cbc_init,
129 .cra_exit = nx_crypto_ctx_exit,
131 .min_keysize = AES_MIN_KEY_SIZE,
132 .max_keysize = AES_MAX_KEY_SIZE,
133 .ivsize = AES_BLOCK_SIZE,
134 .setkey = cbc_aes_nx_set_key,
135 .encrypt = cbc_aes_nx_encrypt,
136 .decrypt = cbc_aes_nx_decrypt,