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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * AES ECB routines supporting the Power 7+ Nest Accelerators driver4 *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/algapi.h>12#include <linux/module.h>13#include <linux/types.h>14#include <linux/crypto.h>15#include <asm/vio.h>16 17#include "nx_csbcpb.h"18#include "nx.h"19 20 21static int ecb_aes_nx_set_key(struct crypto_skcipher *tfm,22 const u8 *in_key,23 unsigned int key_len)24{25 struct nx_crypto_ctx *nx_ctx = crypto_skcipher_ctx(tfm);26 struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;27 28 nx_ctx_init(nx_ctx, HCOP_FC_AES);29 30 switch (key_len) {31 case AES_KEYSIZE_128:32 NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_128);33 nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_128];34 break;35 case AES_KEYSIZE_192:36 NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_192);37 nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_192];38 break;39 case AES_KEYSIZE_256:40 NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_256);41 nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_256];42 break;43 default:44 return -EINVAL;45 }46 47 csbcpb->cpb.hdr.mode = NX_MODE_AES_ECB;48 memcpy(csbcpb->cpb.aes_ecb.key, in_key, key_len);49 50 return 0;51}52 53static int ecb_aes_nx_crypt(struct skcipher_request *req,54 int enc)55{56 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);57 struct nx_crypto_ctx *nx_ctx = crypto_skcipher_ctx(tfm);58 struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;59 unsigned long irq_flags;60 unsigned int processed = 0, to_process;61 int rc;62 63 spin_lock_irqsave(&nx_ctx->lock, irq_flags);64 65 if (enc)66 NX_CPB_FDM(csbcpb) |= NX_FDM_ENDE_ENCRYPT;67 else68 NX_CPB_FDM(csbcpb) &= ~NX_FDM_ENDE_ENCRYPT;69 70 do {71 to_process = req->cryptlen - processed;72 73 rc = nx_build_sg_lists(nx_ctx, NULL, req->dst, req->src,74 &to_process, processed, NULL);75 if (rc)76 goto out;77 78 if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {79 rc = -EINVAL;80 goto out;81 }82 83 rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,84 req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);85 if (rc)86 goto out;87 88 atomic_inc(&(nx_ctx->stats->aes_ops));89 atomic64_add(be32_to_cpu(csbcpb->csb.processed_byte_count),90 &(nx_ctx->stats->aes_bytes));91 92 processed += to_process;93 } while (processed < req->cryptlen);94 95out:96 spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);97 return rc;98}99 100static int ecb_aes_nx_encrypt(struct skcipher_request *req)101{102 return ecb_aes_nx_crypt(req, 1);103}104 105static int ecb_aes_nx_decrypt(struct skcipher_request *req)106{107 return ecb_aes_nx_crypt(req, 0);108}109 110struct skcipher_alg nx_ecb_aes_alg = {111 .base.cra_name = "ecb(aes)",112 .base.cra_driver_name = "ecb-aes-nx",113 .base.cra_priority = 300,114 .base.cra_blocksize = AES_BLOCK_SIZE,115 .base.cra_alignmask = 0xf,116 .base.cra_ctxsize = sizeof(struct nx_crypto_ctx),117 .base.cra_module = THIS_MODULE,118 .init = nx_crypto_ctx_aes_ecb_init,119 .exit = nx_crypto_ctx_skcipher_exit,120 .min_keysize = AES_MIN_KEY_SIZE,121 .max_keysize = AES_MAX_KEY_SIZE,122 .setkey = ecb_aes_nx_set_key,123 .encrypt = ecb_aes_nx_encrypt,124 .decrypt = ecb_aes_nx_decrypt,125};126