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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 | /** * AES CTR routines supporting the Power 7+ Nest Accelerators driver * * Copyright (C) 2011-2012 International Business Machines Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 only. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * Author: Kent Yoder <yoder1@us.ibm.com> */ #include <crypto/aes.h> #include <crypto/ctr.h> #include <crypto/algapi.h> #include <linux/module.h> #include <linux/types.h> #include <linux/crypto.h> #include <asm/vio.h> #include "nx_csbcpb.h" #include "nx.h" static int ctr_aes_nx_set_key(struct crypto_tfm *tfm, const u8 *in_key, unsigned int key_len) { struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(tfm); struct nx_csbcpb *csbcpb = nx_ctx->csbcpb; nx_ctx_init(nx_ctx, HCOP_FC_AES); switch (key_len) { case AES_KEYSIZE_128: NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_128); nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_128]; break; case AES_KEYSIZE_192: NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_192); nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_192]; break; case AES_KEYSIZE_256: NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_256); nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_256]; break; default: return -EINVAL; } csbcpb->cpb.hdr.mode = NX_MODE_AES_CTR; memcpy(csbcpb->cpb.aes_ctr.key, in_key, key_len); return 0; } static int ctr3686_aes_nx_set_key(struct crypto_tfm *tfm, const u8 *in_key, unsigned int key_len) { struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(tfm); if (key_len < CTR_RFC3686_NONCE_SIZE) return -EINVAL; memcpy(nx_ctx->priv.ctr.nonce, in_key + key_len - CTR_RFC3686_NONCE_SIZE, CTR_RFC3686_NONCE_SIZE); key_len -= CTR_RFC3686_NONCE_SIZE; return ctr_aes_nx_set_key(tfm, in_key, key_len); } static int ctr_aes_nx_crypt(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes) { struct nx_crypto_ctx *nx_ctx = crypto_blkcipher_ctx(desc->tfm); struct nx_csbcpb *csbcpb = nx_ctx->csbcpb; unsigned long irq_flags; unsigned int processed = 0, to_process; int rc; spin_lock_irqsave(&nx_ctx->lock, irq_flags); do { to_process = nbytes - processed; rc = nx_build_sg_lists(nx_ctx, desc, dst, src, &to_process, processed, csbcpb->cpb.aes_ctr.iv); if (rc) goto out; if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) { rc = -EINVAL; goto out; } rc = nx_hcall_sync(nx_ctx, &nx_ctx->op, desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP); if (rc) goto out; memcpy(desc->info, csbcpb->cpb.aes_cbc.cv, AES_BLOCK_SIZE); atomic_inc(&(nx_ctx->stats->aes_ops)); atomic64_add(csbcpb->csb.processed_byte_count, &(nx_ctx->stats->aes_bytes)); processed += to_process; } while (processed < nbytes); out: spin_unlock_irqrestore(&nx_ctx->lock, irq_flags); return rc; } static int ctr3686_aes_nx_crypt(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes) { struct nx_crypto_ctx *nx_ctx = crypto_blkcipher_ctx(desc->tfm); u8 iv[16]; memcpy(iv, nx_ctx->priv.ctr.nonce, CTR_RFC3686_IV_SIZE); memcpy(iv + CTR_RFC3686_NONCE_SIZE, desc->info, CTR_RFC3686_IV_SIZE); iv[12] = iv[13] = iv[14] = 0; iv[15] = 1; desc->info = iv; return ctr_aes_nx_crypt(desc, dst, src, nbytes); } struct crypto_alg nx_ctr3686_aes_alg = { .cra_name = "rfc3686(ctr(aes))", .cra_driver_name = "rfc3686-ctr-aes-nx", .cra_priority = 300, .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, .cra_blocksize = 1, .cra_ctxsize = sizeof(struct nx_crypto_ctx), .cra_type = &crypto_blkcipher_type, .cra_module = THIS_MODULE, .cra_init = nx_crypto_ctx_aes_ctr_init, .cra_exit = nx_crypto_ctx_exit, .cra_blkcipher = { .min_keysize = AES_MIN_KEY_SIZE + CTR_RFC3686_NONCE_SIZE, .max_keysize = AES_MAX_KEY_SIZE + CTR_RFC3686_NONCE_SIZE, .ivsize = CTR_RFC3686_IV_SIZE, .setkey = ctr3686_aes_nx_set_key, .encrypt = ctr3686_aes_nx_crypt, .decrypt = ctr3686_aes_nx_crypt, } }; |