1 // SPDX-License-Identifier: GPL-2.0-only 2 /** 3 * AES CTR 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/ctr.h> 12 #include <crypto/algapi.h> 13 #include <linux/module.h> 14 #include <linux/types.h> 15 #include <linux/crypto.h> 16 #include <asm/vio.h> 17 18 #include "nx_csbcpb.h" 19 #include "nx.h" 20 21 22 static int ctr_aes_nx_set_key(struct crypto_tfm *tfm, 23 const u8 *in_key, 24 unsigned int key_len) 25 { 26 struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(tfm); 27 struct nx_csbcpb *csbcpb = nx_ctx->csbcpb; 28 29 nx_ctx_init(nx_ctx, HCOP_FC_AES); 30 31 switch (key_len) { 32 case AES_KEYSIZE_128: 33 NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_128); 34 nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_128]; 35 break; 36 case AES_KEYSIZE_192: 37 NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_192); 38 nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_192]; 39 break; 40 case AES_KEYSIZE_256: 41 NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_256); 42 nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_256]; 43 break; 44 default: 45 return -EINVAL; 46 } 47 48 csbcpb->cpb.hdr.mode = NX_MODE_AES_CTR; 49 memcpy(csbcpb->cpb.aes_ctr.key, in_key, key_len); 50 51 return 0; 52 } 53 54 static int ctr3686_aes_nx_set_key(struct crypto_tfm *tfm, 55 const u8 *in_key, 56 unsigned int key_len) 57 { 58 struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(tfm); 59 60 if (key_len < CTR_RFC3686_NONCE_SIZE) 61 return -EINVAL; 62 63 memcpy(nx_ctx->priv.ctr.nonce, 64 in_key + key_len - CTR_RFC3686_NONCE_SIZE, 65 CTR_RFC3686_NONCE_SIZE); 66 67 key_len -= CTR_RFC3686_NONCE_SIZE; 68 69 return ctr_aes_nx_set_key(tfm, in_key, key_len); 70 } 71 72 static int ctr_aes_nx_crypt(struct blkcipher_desc *desc, 73 struct scatterlist *dst, 74 struct scatterlist *src, 75 unsigned int nbytes) 76 { 77 struct nx_crypto_ctx *nx_ctx = crypto_blkcipher_ctx(desc->tfm); 78 struct nx_csbcpb *csbcpb = nx_ctx->csbcpb; 79 unsigned long irq_flags; 80 unsigned int processed = 0, to_process; 81 int rc; 82 83 spin_lock_irqsave(&nx_ctx->lock, irq_flags); 84 85 do { 86 to_process = nbytes - processed; 87 88 rc = nx_build_sg_lists(nx_ctx, desc, dst, src, &to_process, 89 processed, csbcpb->cpb.aes_ctr.iv); 90 if (rc) 91 goto out; 92 93 if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) { 94 rc = -EINVAL; 95 goto out; 96 } 97 98 rc = nx_hcall_sync(nx_ctx, &nx_ctx->op, 99 desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP); 100 if (rc) 101 goto out; 102 103 memcpy(desc->info, csbcpb->cpb.aes_cbc.cv, AES_BLOCK_SIZE); 104 105 atomic_inc(&(nx_ctx->stats->aes_ops)); 106 atomic64_add(csbcpb->csb.processed_byte_count, 107 &(nx_ctx->stats->aes_bytes)); 108 109 processed += to_process; 110 } while (processed < nbytes); 111 out: 112 spin_unlock_irqrestore(&nx_ctx->lock, irq_flags); 113 return rc; 114 } 115 116 static int ctr3686_aes_nx_crypt(struct blkcipher_desc *desc, 117 struct scatterlist *dst, 118 struct scatterlist *src, 119 unsigned int nbytes) 120 { 121 struct nx_crypto_ctx *nx_ctx = crypto_blkcipher_ctx(desc->tfm); 122 u8 iv[16]; 123 124 memcpy(iv, nx_ctx->priv.ctr.nonce, CTR_RFC3686_IV_SIZE); 125 memcpy(iv + CTR_RFC3686_NONCE_SIZE, 126 desc->info, CTR_RFC3686_IV_SIZE); 127 iv[12] = iv[13] = iv[14] = 0; 128 iv[15] = 1; 129 130 desc->info = iv; 131 132 return ctr_aes_nx_crypt(desc, dst, src, nbytes); 133 } 134 135 struct crypto_alg nx_ctr3686_aes_alg = { 136 .cra_name = "rfc3686(ctr(aes))", 137 .cra_driver_name = "rfc3686-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 + CTR_RFC3686_NONCE_SIZE, 148 .max_keysize = AES_MAX_KEY_SIZE + CTR_RFC3686_NONCE_SIZE, 149 .ivsize = CTR_RFC3686_IV_SIZE, 150 .setkey = ctr3686_aes_nx_set_key, 151 .encrypt = ctr3686_aes_nx_crypt, 152 .decrypt = ctr3686_aes_nx_crypt, 153 } 154 }; 155