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_skcipher *tfm, 23 const u8 *in_key, 24 unsigned int key_len) 25 { 26 struct nx_crypto_ctx *nx_ctx = crypto_skcipher_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_skcipher *tfm, 55 const u8 *in_key, 56 unsigned int key_len) 57 { 58 struct nx_crypto_ctx *nx_ctx = crypto_skcipher_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 skcipher_request *req, u8 *iv) 73 { 74 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 75 struct nx_crypto_ctx *nx_ctx = crypto_skcipher_ctx(tfm); 76 struct nx_csbcpb *csbcpb = nx_ctx->csbcpb; 77 unsigned long irq_flags; 78 unsigned int processed = 0, to_process; 79 int rc; 80 81 spin_lock_irqsave(&nx_ctx->lock, irq_flags); 82 83 do { 84 to_process = req->cryptlen - processed; 85 86 rc = nx_build_sg_lists(nx_ctx, iv, req->dst, req->src, 87 &to_process, processed, 88 csbcpb->cpb.aes_ctr.iv); 89 if (rc) 90 goto out; 91 92 if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) { 93 rc = -EINVAL; 94 goto out; 95 } 96 97 rc = nx_hcall_sync(nx_ctx, &nx_ctx->op, 98 req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP); 99 if (rc) 100 goto out; 101 102 memcpy(iv, csbcpb->cpb.aes_cbc.cv, AES_BLOCK_SIZE); 103 104 atomic_inc(&(nx_ctx->stats->aes_ops)); 105 atomic64_add(csbcpb->csb.processed_byte_count, 106 &(nx_ctx->stats->aes_bytes)); 107 108 processed += to_process; 109 } while (processed < req->cryptlen); 110 out: 111 spin_unlock_irqrestore(&nx_ctx->lock, irq_flags); 112 return rc; 113 } 114 115 static int ctr3686_aes_nx_crypt(struct skcipher_request *req) 116 { 117 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 118 struct nx_crypto_ctx *nx_ctx = crypto_skcipher_ctx(tfm); 119 u8 iv[16]; 120 121 memcpy(iv, nx_ctx->priv.ctr.nonce, CTR_RFC3686_IV_SIZE); 122 memcpy(iv + CTR_RFC3686_NONCE_SIZE, req->iv, CTR_RFC3686_IV_SIZE); 123 iv[12] = iv[13] = iv[14] = 0; 124 iv[15] = 1; 125 126 return ctr_aes_nx_crypt(req, iv); 127 } 128 129 struct skcipher_alg nx_ctr3686_aes_alg = { 130 .base.cra_name = "rfc3686(ctr(aes))", 131 .base.cra_driver_name = "rfc3686-ctr-aes-nx", 132 .base.cra_priority = 300, 133 .base.cra_blocksize = 1, 134 .base.cra_ctxsize = sizeof(struct nx_crypto_ctx), 135 .base.cra_module = THIS_MODULE, 136 .init = nx_crypto_ctx_aes_ctr_init, 137 .exit = nx_crypto_ctx_skcipher_exit, 138 .min_keysize = AES_MIN_KEY_SIZE + CTR_RFC3686_NONCE_SIZE, 139 .max_keysize = AES_MAX_KEY_SIZE + CTR_RFC3686_NONCE_SIZE, 140 .ivsize = CTR_RFC3686_IV_SIZE, 141 .setkey = ctr3686_aes_nx_set_key, 142 .encrypt = ctr3686_aes_nx_crypt, 143 .decrypt = ctr3686_aes_nx_crypt, 144 .chunksize = AES_BLOCK_SIZE, 145 }; 146