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 <crypto/ctr.h> 32 #include "crypto4xx_reg_def.h" 33 #include "crypto4xx_core.h" 34 #include "crypto4xx_sa.h" 35 36 static void set_dynamic_sa_command_0(struct dynamic_sa_ctl *sa, u32 save_h, 37 u32 save_iv, u32 ld_h, u32 ld_iv, 38 u32 hdr_proc, u32 h, u32 c, u32 pad_type, 39 u32 op_grp, u32 op, u32 dir) 40 { 41 sa->sa_command_0.w = 0; 42 sa->sa_command_0.bf.save_hash_state = save_h; 43 sa->sa_command_0.bf.save_iv = save_iv; 44 sa->sa_command_0.bf.load_hash_state = ld_h; 45 sa->sa_command_0.bf.load_iv = ld_iv; 46 sa->sa_command_0.bf.hdr_proc = hdr_proc; 47 sa->sa_command_0.bf.hash_alg = h; 48 sa->sa_command_0.bf.cipher_alg = c; 49 sa->sa_command_0.bf.pad_type = pad_type & 3; 50 sa->sa_command_0.bf.extend_pad = pad_type >> 2; 51 sa->sa_command_0.bf.op_group = op_grp; 52 sa->sa_command_0.bf.opcode = op; 53 sa->sa_command_0.bf.dir = dir; 54 } 55 56 static void set_dynamic_sa_command_1(struct dynamic_sa_ctl *sa, u32 cm, 57 u32 hmac_mc, u32 cfb, u32 esn, 58 u32 sn_mask, u32 mute, u32 cp_pad, 59 u32 cp_pay, u32 cp_hdr) 60 { 61 sa->sa_command_1.w = 0; 62 sa->sa_command_1.bf.crypto_mode31 = (cm & 4) >> 2; 63 sa->sa_command_1.bf.crypto_mode9_8 = cm & 3; 64 sa->sa_command_1.bf.feedback_mode = cfb, 65 sa->sa_command_1.bf.sa_rev = 1; 66 sa->sa_command_1.bf.hmac_muting = hmac_mc; 67 sa->sa_command_1.bf.extended_seq_num = esn; 68 sa->sa_command_1.bf.seq_num_mask = sn_mask; 69 sa->sa_command_1.bf.mutable_bit_proc = mute; 70 sa->sa_command_1.bf.copy_pad = cp_pad; 71 sa->sa_command_1.bf.copy_payload = cp_pay; 72 sa->sa_command_1.bf.copy_hdr = cp_hdr; 73 } 74 75 int crypto4xx_encrypt(struct ablkcipher_request *req) 76 { 77 struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm); 78 79 ctx->direction = DIR_OUTBOUND; 80 ctx->is_hash = 0; 81 ctx->pd_ctl = 0x1; 82 83 return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst, 84 req->nbytes, req->info, 85 crypto_ablkcipher_ivsize(crypto_ablkcipher_reqtfm(req))); 86 } 87 88 int crypto4xx_decrypt(struct ablkcipher_request *req) 89 { 90 struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm); 91 92 ctx->direction = DIR_INBOUND; 93 ctx->is_hash = 0; 94 ctx->pd_ctl = 1; 95 96 return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst, 97 req->nbytes, req->info, 98 crypto_ablkcipher_ivsize(crypto_ablkcipher_reqtfm(req))); 99 } 100 101 /** 102 * AES Functions 103 */ 104 static int crypto4xx_setkey_aes(struct crypto_ablkcipher *cipher, 105 const u8 *key, 106 unsigned int keylen, 107 unsigned char cm, 108 u8 fb) 109 { 110 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher); 111 struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm); 112 struct dynamic_sa_ctl *sa; 113 int rc; 114 115 if (keylen != AES_KEYSIZE_256 && 116 keylen != AES_KEYSIZE_192 && keylen != AES_KEYSIZE_128) { 117 crypto_ablkcipher_set_flags(cipher, 118 CRYPTO_TFM_RES_BAD_KEY_LEN); 119 return -EINVAL; 120 } 121 122 /* Create SA */ 123 if (ctx->sa_in_dma_addr || ctx->sa_out_dma_addr) 124 crypto4xx_free_sa(ctx); 125 126 rc = crypto4xx_alloc_sa(ctx, SA_AES128_LEN + (keylen-16) / 4); 127 if (rc) 128 return rc; 129 130 if (ctx->state_record_dma_addr == 0) { 131 rc = crypto4xx_alloc_state_record(ctx); 132 if (rc) { 133 crypto4xx_free_sa(ctx); 134 return rc; 135 } 136 } 137 /* Setup SA */ 138 sa = ctx->sa_in; 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(get_dynamic_sa_key_field(sa), 153 key, keylen); 154 sa->sa_contents.w = 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(sa + get_dynamic_sa_offset_state_ptr_field(sa), 159 (void *)&ctx->state_record_dma_addr, 4); 160 ctx->offset_to_sr_ptr = get_dynamic_sa_offset_state_ptr_field(sa); 161 162 memcpy(ctx->sa_out, ctx->sa_in, ctx->sa_len * 4); 163 sa = ctx->sa_out; 164 sa->sa_command_0.bf.dir = DIR_OUTBOUND; 165 166 return 0; 167 } 168 169 int 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 int crypto4xx_setkey_aes_cfb(struct crypto_ablkcipher *cipher, 177 const u8 *key, unsigned int keylen) 178 { 179 return crypto4xx_setkey_aes(cipher, key, keylen, CRYPTO_MODE_CFB, 180 CRYPTO_FEEDBACK_MODE_128BIT_CFB); 181 } 182 183 int crypto4xx_setkey_aes_ecb(struct crypto_ablkcipher *cipher, 184 const u8 *key, unsigned int keylen) 185 { 186 return crypto4xx_setkey_aes(cipher, key, keylen, CRYPTO_MODE_ECB, 187 CRYPTO_FEEDBACK_MODE_NO_FB); 188 } 189 190 int crypto4xx_setkey_aes_ofb(struct crypto_ablkcipher *cipher, 191 const u8 *key, unsigned int keylen) 192 { 193 return crypto4xx_setkey_aes(cipher, key, keylen, CRYPTO_MODE_OFB, 194 CRYPTO_FEEDBACK_MODE_64BIT_OFB); 195 } 196 197 int crypto4xx_setkey_rfc3686(struct crypto_ablkcipher *cipher, 198 const u8 *key, unsigned int keylen) 199 { 200 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher); 201 struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm); 202 int rc; 203 204 rc = crypto4xx_setkey_aes(cipher, key, keylen - CTR_RFC3686_NONCE_SIZE, 205 CRYPTO_MODE_CTR, CRYPTO_FEEDBACK_MODE_NO_FB); 206 if (rc) 207 return rc; 208 209 memcpy(ctx->state_record, 210 key + keylen - CTR_RFC3686_NONCE_SIZE, CTR_RFC3686_NONCE_SIZE); 211 212 return 0; 213 } 214 215 int crypto4xx_rfc3686_encrypt(struct ablkcipher_request *req) 216 { 217 struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm); 218 __be32 iv[AES_IV_SIZE / 4] = { *(u32 *)ctx->state_record, 219 *(u32 *) req->info, *(u32 *) (req->info + 4), cpu_to_be32(1) }; 220 221 ctx->direction = DIR_OUTBOUND; 222 ctx->pd_ctl = 1; 223 224 return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst, 225 req->nbytes, iv, AES_IV_SIZE); 226 } 227 228 int crypto4xx_rfc3686_decrypt(struct ablkcipher_request *req) 229 { 230 struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm); 231 __be32 iv[AES_IV_SIZE / 4] = { *(u32 *)ctx->state_record, 232 *(u32 *) req->info, *(u32 *) (req->info + 4), cpu_to_be32(1) }; 233 234 ctx->direction = DIR_INBOUND; 235 ctx->pd_ctl = 1; 236 237 return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst, 238 req->nbytes, iv, AES_IV_SIZE); 239 } 240 241 /** 242 * HASH SHA1 Functions 243 */ 244 static int crypto4xx_hash_alg_init(struct crypto_tfm *tfm, 245 unsigned int sa_len, 246 unsigned char ha, 247 unsigned char hm) 248 { 249 struct crypto_alg *alg = tfm->__crt_alg; 250 struct crypto4xx_alg *my_alg = crypto_alg_to_crypto4xx_alg(alg); 251 struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm); 252 struct dynamic_sa_hash160 *sa; 253 int rc; 254 255 ctx->dev = my_alg->dev; 256 ctx->is_hash = 1; 257 258 /* Create SA */ 259 if (ctx->sa_in_dma_addr || ctx->sa_out_dma_addr) 260 crypto4xx_free_sa(ctx); 261 262 rc = crypto4xx_alloc_sa(ctx, sa_len); 263 if (rc) 264 return rc; 265 266 if (ctx->state_record_dma_addr == 0) { 267 crypto4xx_alloc_state_record(ctx); 268 if (!ctx->state_record_dma_addr) { 269 crypto4xx_free_sa(ctx); 270 return -ENOMEM; 271 } 272 } 273 274 crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm), 275 sizeof(struct crypto4xx_ctx)); 276 sa = (struct dynamic_sa_hash160 *)ctx->sa_in; 277 set_dynamic_sa_command_0(&sa->ctrl, SA_SAVE_HASH, SA_NOT_SAVE_IV, 278 SA_NOT_LOAD_HASH, SA_LOAD_IV_FROM_SA, 279 SA_NO_HEADER_PROC, ha, SA_CIPHER_ALG_NULL, 280 SA_PAD_TYPE_ZERO, SA_OP_GROUP_BASIC, 281 SA_OPCODE_HASH, DIR_INBOUND); 282 set_dynamic_sa_command_1(&sa->ctrl, 0, SA_HASH_MODE_HASH, 283 CRYPTO_FEEDBACK_MODE_NO_FB, SA_EXTENDED_SN_OFF, 284 SA_SEQ_MASK_OFF, SA_MC_ENABLE, 285 SA_NOT_COPY_PAD, SA_NOT_COPY_PAYLOAD, 286 SA_NOT_COPY_HDR); 287 ctx->direction = DIR_INBOUND; 288 /* Need to zero hash digest in SA */ 289 memset(sa->inner_digest, 0, sizeof(sa->inner_digest)); 290 memset(sa->outer_digest, 0, sizeof(sa->outer_digest)); 291 sa->state_ptr = ctx->state_record_dma_addr; 292 ctx->offset_to_sr_ptr = 293 get_dynamic_sa_offset_state_ptr_field(&sa->ctrl); 294 295 return 0; 296 } 297 298 int crypto4xx_hash_init(struct ahash_request *req) 299 { 300 struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm); 301 int ds; 302 struct dynamic_sa_ctl *sa; 303 304 sa = ctx->sa_in; 305 ds = crypto_ahash_digestsize( 306 __crypto_ahash_cast(req->base.tfm)); 307 sa->sa_command_0.bf.digest_len = ds >> 2; 308 sa->sa_command_0.bf.load_hash_state = SA_LOAD_HASH_FROM_SA; 309 ctx->is_hash = 1; 310 ctx->direction = DIR_INBOUND; 311 312 return 0; 313 } 314 315 int crypto4xx_hash_update(struct ahash_request *req) 316 { 317 struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm); 318 319 ctx->is_hash = 1; 320 ctx->pd_ctl = 0x11; 321 ctx->direction = DIR_INBOUND; 322 323 return crypto4xx_build_pd(&req->base, ctx, req->src, 324 (struct scatterlist *) req->result, 325 req->nbytes, NULL, 0); 326 } 327 328 int crypto4xx_hash_final(struct ahash_request *req) 329 { 330 return 0; 331 } 332 333 int crypto4xx_hash_digest(struct ahash_request *req) 334 { 335 struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm); 336 337 ctx->pd_ctl = 0x11; 338 ctx->direction = DIR_INBOUND; 339 340 return crypto4xx_build_pd(&req->base, ctx, req->src, 341 (struct scatterlist *) req->result, 342 req->nbytes, NULL, 0); 343 } 344 345 /** 346 * SHA1 Algorithm 347 */ 348 int crypto4xx_sha1_alg_init(struct crypto_tfm *tfm) 349 { 350 return crypto4xx_hash_alg_init(tfm, SA_HASH160_LEN, SA_HASH_ALG_SHA1, 351 SA_HASH_MODE_HASH); 352 } 353 354 355