1/** 2 * AMCC SoC PPC4xx Crypto Driver 3 * 4 * Copyright (c) 2008 Applied Micro Circuits Corporation. 5 * All rights reserved. James Hsiao <jhsiao@amcc.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * This file implements the Linux crypto algorithms. 18 */ 19 20#include <linux/kernel.h> 21#include <linux/interrupt.h> 22#include <linux/spinlock_types.h> 23#include <linux/scatterlist.h> 24#include <linux/crypto.h> 25#include <linux/hash.h> 26#include <crypto/internal/hash.h> 27#include <linux/dma-mapping.h> 28#include <crypto/algapi.h> 29#include <crypto/aes.h> 30#include <crypto/sha.h> 31#include "crypto4xx_reg_def.h" 32#include "crypto4xx_sa.h" 33#include "crypto4xx_core.h" 34 35void set_dynamic_sa_command_0(struct dynamic_sa_ctl *sa, u32 save_h, 36 u32 save_iv, u32 ld_h, u32 ld_iv, u32 hdr_proc, 37 u32 h, u32 c, u32 pad_type, u32 op_grp, u32 op, 38 u32 dir) 39{ 40 sa->sa_command_0.w = 0; 41 sa->sa_command_0.bf.save_hash_state = save_h; 42 sa->sa_command_0.bf.save_iv = save_iv; 43 sa->sa_command_0.bf.load_hash_state = ld_h; 44 sa->sa_command_0.bf.load_iv = ld_iv; 45 sa->sa_command_0.bf.hdr_proc = hdr_proc; 46 sa->sa_command_0.bf.hash_alg = h; 47 sa->sa_command_0.bf.cipher_alg = c; 48 sa->sa_command_0.bf.pad_type = pad_type & 3; 49 sa->sa_command_0.bf.extend_pad = pad_type >> 2; 50 sa->sa_command_0.bf.op_group = op_grp; 51 sa->sa_command_0.bf.opcode = op; 52 sa->sa_command_0.bf.dir = dir; 53} 54 55void set_dynamic_sa_command_1(struct dynamic_sa_ctl *sa, u32 cm, u32 hmac_mc, 56 u32 cfb, u32 esn, u32 sn_mask, u32 mute, 57 u32 cp_pad, u32 cp_pay, u32 cp_hdr) 58{ 59 sa->sa_command_1.w = 0; 60 sa->sa_command_1.bf.crypto_mode31 = (cm & 4) >> 2; 61 sa->sa_command_1.bf.crypto_mode9_8 = cm & 3; 62 sa->sa_command_1.bf.feedback_mode = cfb, 63 sa->sa_command_1.bf.sa_rev = 1; 64 sa->sa_command_1.bf.extended_seq_num = esn; 65 sa->sa_command_1.bf.seq_num_mask = sn_mask; 66 sa->sa_command_1.bf.mutable_bit_proc = mute; 67 sa->sa_command_1.bf.copy_pad = cp_pad; 68 sa->sa_command_1.bf.copy_payload = cp_pay; 69 sa->sa_command_1.bf.copy_hdr = cp_hdr; 70} 71 72int crypto4xx_encrypt(struct ablkcipher_request *req) 73{ 74 struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm); 75 76 ctx->direction = DIR_OUTBOUND; 77 ctx->hash_final = 0; 78 ctx->is_hash = 0; 79 ctx->pd_ctl = 0x1; 80 81 return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst, 82 req->nbytes, req->info, 83 get_dynamic_sa_iv_size(ctx)); 84} 85 86int crypto4xx_decrypt(struct ablkcipher_request *req) 87{ 88 struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm); 89 90 ctx->direction = DIR_INBOUND; 91 ctx->hash_final = 0; 92 ctx->is_hash = 0; 93 ctx->pd_ctl = 1; 94 95 return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst, 96 req->nbytes, req->info, 97 get_dynamic_sa_iv_size(ctx)); 98} 99 100/** 101 * AES Functions 102 */ 103static int crypto4xx_setkey_aes(struct crypto_ablkcipher *cipher, 104 const u8 *key, 105 unsigned int keylen, 106 unsigned char cm, 107 u8 fb) 108{ 109 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher); 110 struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm); 111 struct dynamic_sa_ctl *sa; 112 int rc; 113 114 if (keylen != AES_KEYSIZE_256 && 115 keylen != AES_KEYSIZE_192 && keylen != AES_KEYSIZE_128) { 116 crypto_ablkcipher_set_flags(cipher, 117 CRYPTO_TFM_RES_BAD_KEY_LEN); 118 return -EINVAL; 119 } 120 121 /* Create SA */ 122 if (ctx->sa_in_dma_addr || ctx->sa_out_dma_addr) 123 crypto4xx_free_sa(ctx); 124 125 rc = crypto4xx_alloc_sa(ctx, SA_AES128_LEN + (keylen-16) / 4); 126 if (rc) 127 return rc; 128 129 if (ctx->state_record_dma_addr == 0) { 130 rc = crypto4xx_alloc_state_record(ctx); 131 if (rc) { 132 crypto4xx_free_sa(ctx); 133 return rc; 134 } 135 } 136 /* Setup SA */ 137 sa = (struct dynamic_sa_ctl *) ctx->sa_in; 138 ctx->hash_final = 0; 139 140 set_dynamic_sa_command_0(sa, SA_NOT_SAVE_HASH, SA_NOT_SAVE_IV, 141 SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE, 142 SA_NO_HEADER_PROC, SA_HASH_ALG_NULL, 143 SA_CIPHER_ALG_AES, SA_PAD_TYPE_ZERO, 144 SA_OP_GROUP_BASIC, SA_OPCODE_DECRYPT, 145 DIR_INBOUND); 146 147 set_dynamic_sa_command_1(sa, cm, SA_HASH_MODE_HASH, 148 fb, SA_EXTENDED_SN_OFF, 149 SA_SEQ_MASK_OFF, SA_MC_ENABLE, 150 SA_NOT_COPY_PAD, SA_NOT_COPY_PAYLOAD, 151 SA_NOT_COPY_HDR); 152 crypto4xx_memcpy_le(ctx->sa_in + get_dynamic_sa_offset_key_field(ctx), 153 key, keylen); 154 sa->sa_contents = SA_AES_CONTENTS | (keylen << 2); 155 sa->sa_command_1.bf.key_len = keylen >> 3; 156 ctx->is_hash = 0; 157 ctx->direction = DIR_INBOUND; 158 memcpy(ctx->sa_in + get_dynamic_sa_offset_state_ptr_field(ctx), 159 (void *)&ctx->state_record_dma_addr, 4); 160 ctx->offset_to_sr_ptr = get_dynamic_sa_offset_state_ptr_field(ctx); 161 162 memcpy(ctx->sa_out, ctx->sa_in, ctx->sa_len * 4); 163 sa = (struct dynamic_sa_ctl *) ctx->sa_out; 164 sa->sa_command_0.bf.dir = DIR_OUTBOUND; 165 166 return 0; 167} 168 169int crypto4xx_setkey_aes_cbc(struct crypto_ablkcipher *cipher, 170 const u8 *key, unsigned int keylen) 171{ 172 return crypto4xx_setkey_aes(cipher, key, keylen, CRYPTO_MODE_CBC, 173 CRYPTO_FEEDBACK_MODE_NO_FB); 174} 175 176/** 177 * HASH SHA1 Functions 178 */ 179static int crypto4xx_hash_alg_init(struct crypto_tfm *tfm, 180 unsigned int sa_len, 181 unsigned char ha, 182 unsigned char hm) 183{ 184 struct crypto_alg *alg = tfm->__crt_alg; 185 struct crypto4xx_alg *my_alg = crypto_alg_to_crypto4xx_alg(alg); 186 struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm); 187 struct dynamic_sa_ctl *sa; 188 struct dynamic_sa_hash160 *sa_in; 189 int rc; 190 191 ctx->dev = my_alg->dev; 192 ctx->is_hash = 1; 193 ctx->hash_final = 0; 194 195 /* Create SA */ 196 if (ctx->sa_in_dma_addr || ctx->sa_out_dma_addr) 197 crypto4xx_free_sa(ctx); 198 199 rc = crypto4xx_alloc_sa(ctx, sa_len); 200 if (rc) 201 return rc; 202 203 if (ctx->state_record_dma_addr == 0) { 204 crypto4xx_alloc_state_record(ctx); 205 if (!ctx->state_record_dma_addr) { 206 crypto4xx_free_sa(ctx); 207 return -ENOMEM; 208 } 209 } 210 211 crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm), 212 sizeof(struct crypto4xx_ctx)); 213 sa = (struct dynamic_sa_ctl *) ctx->sa_in; 214 set_dynamic_sa_command_0(sa, SA_SAVE_HASH, SA_NOT_SAVE_IV, 215 SA_NOT_LOAD_HASH, SA_LOAD_IV_FROM_SA, 216 SA_NO_HEADER_PROC, ha, SA_CIPHER_ALG_NULL, 217 SA_PAD_TYPE_ZERO, SA_OP_GROUP_BASIC, 218 SA_OPCODE_HASH, DIR_INBOUND); 219 set_dynamic_sa_command_1(sa, 0, SA_HASH_MODE_HASH, 220 CRYPTO_FEEDBACK_MODE_NO_FB, SA_EXTENDED_SN_OFF, 221 SA_SEQ_MASK_OFF, SA_MC_ENABLE, 222 SA_NOT_COPY_PAD, SA_NOT_COPY_PAYLOAD, 223 SA_NOT_COPY_HDR); 224 ctx->direction = DIR_INBOUND; 225 sa->sa_contents = SA_HASH160_CONTENTS; 226 sa_in = (struct dynamic_sa_hash160 *) ctx->sa_in; 227 /* Need to zero hash digest in SA */ 228 memset(sa_in->inner_digest, 0, sizeof(sa_in->inner_digest)); 229 memset(sa_in->outer_digest, 0, sizeof(sa_in->outer_digest)); 230 sa_in->state_ptr = ctx->state_record_dma_addr; 231 ctx->offset_to_sr_ptr = get_dynamic_sa_offset_state_ptr_field(ctx); 232 233 return 0; 234} 235 236int crypto4xx_hash_init(struct ahash_request *req) 237{ 238 struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm); 239 int ds; 240 struct dynamic_sa_ctl *sa; 241 242 sa = (struct dynamic_sa_ctl *) ctx->sa_in; 243 ds = crypto_ahash_digestsize( 244 __crypto_ahash_cast(req->base.tfm)); 245 sa->sa_command_0.bf.digest_len = ds >> 2; 246 sa->sa_command_0.bf.load_hash_state = SA_LOAD_HASH_FROM_SA; 247 ctx->is_hash = 1; 248 ctx->direction = DIR_INBOUND; 249 250 return 0; 251} 252 253int crypto4xx_hash_update(struct ahash_request *req) 254{ 255 struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm); 256 257 ctx->is_hash = 1; 258 ctx->hash_final = 0; 259 ctx->pd_ctl = 0x11; 260 ctx->direction = DIR_INBOUND; 261 262 return crypto4xx_build_pd(&req->base, ctx, req->src, 263 (struct scatterlist *) req->result, 264 req->nbytes, NULL, 0); 265} 266 267int crypto4xx_hash_final(struct ahash_request *req) 268{ 269 return 0; 270} 271 272int crypto4xx_hash_digest(struct ahash_request *req) 273{ 274 struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm); 275 276 ctx->hash_final = 1; 277 ctx->pd_ctl = 0x11; 278 ctx->direction = DIR_INBOUND; 279 280 return crypto4xx_build_pd(&req->base, ctx, req->src, 281 (struct scatterlist *) req->result, 282 req->nbytes, NULL, 0); 283} 284 285/** 286 * SHA1 Algorithm 287 */ 288int crypto4xx_sha1_alg_init(struct crypto_tfm *tfm) 289{ 290 return crypto4xx_hash_alg_init(tfm, SA_HASH160_LEN, SA_HASH_ALG_SHA1, 291 SA_HASH_MODE_HASH); 292} 293