1 /** 2 * AES CTR routines supporting the Power 7+ Nest Accelerators driver 3 * 4 * Copyright (C) 2011-2012 International Business Machines Inc. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; version 2 only. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 18 * 19 * Author: Kent Yoder <yoder1@us.ibm.com> 20 */ 21 22 #include <crypto/aes.h> 23 #include <crypto/ctr.h> 24 #include <crypto/algapi.h> 25 #include <linux/module.h> 26 #include <linux/types.h> 27 #include <linux/crypto.h> 28 #include <asm/vio.h> 29 30 #include "nx_csbcpb.h" 31 #include "nx.h" 32 33 34 static int ctr_aes_nx_set_key(struct crypto_tfm *tfm, 35 const u8 *in_key, 36 unsigned int key_len) 37 { 38 struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(tfm); 39 struct nx_csbcpb *csbcpb = nx_ctx->csbcpb; 40 41 nx_ctx_init(nx_ctx, HCOP_FC_AES); 42 43 switch (key_len) { 44 case AES_KEYSIZE_128: 45 NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_128); 46 nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_128]; 47 break; 48 case AES_KEYSIZE_192: 49 NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_192); 50 nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_192]; 51 break; 52 case AES_KEYSIZE_256: 53 NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_256); 54 nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_256]; 55 break; 56 default: 57 return -EINVAL; 58 } 59 60 csbcpb->cpb.hdr.mode = NX_MODE_AES_CTR; 61 memcpy(csbcpb->cpb.aes_ctr.key, in_key, key_len); 62 63 return 0; 64 } 65 66 static int ctr3686_aes_nx_set_key(struct crypto_tfm *tfm, 67 const u8 *in_key, 68 unsigned int key_len) 69 { 70 struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(tfm); 71 72 if (key_len < CTR_RFC3686_NONCE_SIZE) 73 return -EINVAL; 74 75 memcpy(nx_ctx->priv.ctr.iv, 76 in_key + key_len - CTR_RFC3686_NONCE_SIZE, 77 CTR_RFC3686_NONCE_SIZE); 78 79 key_len -= CTR_RFC3686_NONCE_SIZE; 80 81 return ctr_aes_nx_set_key(tfm, in_key, key_len); 82 } 83 84 static int ctr_aes_nx_crypt(struct blkcipher_desc *desc, 85 struct scatterlist *dst, 86 struct scatterlist *src, 87 unsigned int nbytes) 88 { 89 struct nx_crypto_ctx *nx_ctx = crypto_blkcipher_ctx(desc->tfm); 90 struct nx_csbcpb *csbcpb = nx_ctx->csbcpb; 91 int rc; 92 93 if (nbytes > nx_ctx->ap->databytelen) 94 return -EINVAL; 95 96 rc = nx_build_sg_lists(nx_ctx, desc, dst, src, nbytes, 97 csbcpb->cpb.aes_ctr.iv); 98 if (rc) 99 goto out; 100 101 if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) { 102 rc = -EINVAL; 103 goto out; 104 } 105 106 rc = nx_hcall_sync(nx_ctx, &nx_ctx->op, 107 desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP); 108 if (rc) 109 goto out; 110 111 atomic_inc(&(nx_ctx->stats->aes_ops)); 112 atomic64_add(csbcpb->csb.processed_byte_count, 113 &(nx_ctx->stats->aes_bytes)); 114 out: 115 return rc; 116 } 117 118 static int ctr3686_aes_nx_crypt(struct blkcipher_desc *desc, 119 struct scatterlist *dst, 120 struct scatterlist *src, 121 unsigned int nbytes) 122 { 123 struct nx_crypto_ctx *nx_ctx = crypto_blkcipher_ctx(desc->tfm); 124 u8 *iv = nx_ctx->priv.ctr.iv; 125 126 memcpy(iv + CTR_RFC3686_NONCE_SIZE, 127 desc->info, CTR_RFC3686_IV_SIZE); 128 iv[15] = 1; 129 130 desc->info = nx_ctx->priv.ctr.iv; 131 132 return ctr_aes_nx_crypt(desc, dst, src, nbytes); 133 } 134 135 struct crypto_alg nx_ctr_aes_alg = { 136 .cra_name = "ctr(aes)", 137 .cra_driver_name = "ctr-aes-nx", 138 .cra_priority = 300, 139 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, 140 .cra_blocksize = 1, 141 .cra_ctxsize = sizeof(struct nx_crypto_ctx), 142 .cra_type = &crypto_blkcipher_type, 143 .cra_module = THIS_MODULE, 144 .cra_init = nx_crypto_ctx_aes_ctr_init, 145 .cra_exit = nx_crypto_ctx_exit, 146 .cra_blkcipher = { 147 .min_keysize = AES_MIN_KEY_SIZE, 148 .max_keysize = AES_MAX_KEY_SIZE, 149 .ivsize = AES_BLOCK_SIZE, 150 .setkey = ctr_aes_nx_set_key, 151 .encrypt = ctr_aes_nx_crypt, 152 .decrypt = ctr_aes_nx_crypt, 153 } 154 }; 155 156 struct crypto_alg nx_ctr3686_aes_alg = { 157 .cra_name = "rfc3686(ctr(aes))", 158 .cra_driver_name = "rfc3686-ctr-aes-nx", 159 .cra_priority = 300, 160 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, 161 .cra_blocksize = 1, 162 .cra_ctxsize = sizeof(struct nx_crypto_ctx), 163 .cra_type = &crypto_blkcipher_type, 164 .cra_module = THIS_MODULE, 165 .cra_init = nx_crypto_ctx_aes_ctr_init, 166 .cra_exit = nx_crypto_ctx_exit, 167 .cra_blkcipher = { 168 .min_keysize = AES_MIN_KEY_SIZE + CTR_RFC3686_NONCE_SIZE, 169 .max_keysize = AES_MAX_KEY_SIZE + CTR_RFC3686_NONCE_SIZE, 170 .ivsize = CTR_RFC3686_IV_SIZE, 171 .geniv = "seqiv", 172 .setkey = ctr3686_aes_nx_set_key, 173 .encrypt = ctr3686_aes_nx_crypt, 174 .decrypt = ctr3686_aes_nx_crypt, 175 } 176 }; 177