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 35 static void set_dynamic_sa_command_0(struct dynamic_sa_ctl *sa, u32 save_h, 36 u32 save_iv, u32 ld_h, u32 ld_iv, 37 u32 hdr_proc, u32 h, u32 c, u32 pad_type, 38 u32 op_grp, u32 op, 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 55 static void set_dynamic_sa_command_1(struct dynamic_sa_ctl *sa, u32 cm, 56 u32 hmac_mc, u32 cfb, u32 esn, 57 u32 sn_mask, u32 mute, u32 cp_pad, 58 u32 cp_pay, u32 cp_hdr) 59 { 60 sa->sa_command_1.w = 0; 61 sa->sa_command_1.bf.crypto_mode31 = (cm & 4) >> 2; 62 sa->sa_command_1.bf.crypto_mode9_8 = cm & 3; 63 sa->sa_command_1.bf.feedback_mode = cfb, 64 sa->sa_command_1.bf.sa_rev = 1; 65 sa->sa_command_1.bf.extended_seq_num = esn; 66 sa->sa_command_1.bf.seq_num_mask = sn_mask; 67 sa->sa_command_1.bf.mutable_bit_proc = mute; 68 sa->sa_command_1.bf.copy_pad = cp_pad; 69 sa->sa_command_1.bf.copy_payload = cp_pay; 70 sa->sa_command_1.bf.copy_hdr = cp_hdr; 71 } 72 73 int crypto4xx_encrypt(struct ablkcipher_request *req) 74 { 75 struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm); 76 77 ctx->direction = DIR_OUTBOUND; 78 ctx->hash_final = 0; 79 ctx->is_hash = 0; 80 ctx->pd_ctl = 0x1; 81 82 return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst, 83 req->nbytes, req->info, 84 get_dynamic_sa_iv_size(ctx)); 85 } 86 87 int crypto4xx_decrypt(struct ablkcipher_request *req) 88 { 89 struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm); 90 91 ctx->direction = DIR_INBOUND; 92 ctx->hash_final = 0; 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 get_dynamic_sa_iv_size(ctx)); 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 = (struct dynamic_sa_ctl *) ctx->sa_in; 139 ctx->hash_final = 0; 140 141 set_dynamic_sa_command_0(sa, SA_NOT_SAVE_HASH, SA_NOT_SAVE_IV, 142 SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE, 143 SA_NO_HEADER_PROC, SA_HASH_ALG_NULL, 144 SA_CIPHER_ALG_AES, SA_PAD_TYPE_ZERO, 145 SA_OP_GROUP_BASIC, SA_OPCODE_DECRYPT, 146 DIR_INBOUND); 147 148 set_dynamic_sa_command_1(sa, cm, SA_HASH_MODE_HASH, 149 fb, SA_EXTENDED_SN_OFF, 150 SA_SEQ_MASK_OFF, SA_MC_ENABLE, 151 SA_NOT_COPY_PAD, SA_NOT_COPY_PAYLOAD, 152 SA_NOT_COPY_HDR); 153 crypto4xx_memcpy_le(ctx->sa_in + get_dynamic_sa_offset_key_field(ctx), 154 key, keylen); 155 sa->sa_contents = SA_AES_CONTENTS | (keylen << 2); 156 sa->sa_command_1.bf.key_len = keylen >> 3; 157 ctx->is_hash = 0; 158 ctx->direction = DIR_INBOUND; 159 memcpy(ctx->sa_in + get_dynamic_sa_offset_state_ptr_field(ctx), 160 (void *)&ctx->state_record_dma_addr, 4); 161 ctx->offset_to_sr_ptr = get_dynamic_sa_offset_state_ptr_field(ctx); 162 163 memcpy(ctx->sa_out, ctx->sa_in, ctx->sa_len * 4); 164 sa = (struct dynamic_sa_ctl *) ctx->sa_out; 165 sa->sa_command_0.bf.dir = DIR_OUTBOUND; 166 167 return 0; 168 } 169 170 int crypto4xx_setkey_aes_cbc(struct crypto_ablkcipher *cipher, 171 const u8 *key, unsigned int keylen) 172 { 173 return crypto4xx_setkey_aes(cipher, key, keylen, CRYPTO_MODE_CBC, 174 CRYPTO_FEEDBACK_MODE_NO_FB); 175 } 176 177 /** 178 * HASH SHA1 Functions 179 */ 180 static int crypto4xx_hash_alg_init(struct crypto_tfm *tfm, 181 unsigned int sa_len, 182 unsigned char ha, 183 unsigned char hm) 184 { 185 struct crypto_alg *alg = tfm->__crt_alg; 186 struct crypto4xx_alg *my_alg = crypto_alg_to_crypto4xx_alg(alg); 187 struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm); 188 struct dynamic_sa_ctl *sa; 189 struct dynamic_sa_hash160 *sa_in; 190 int rc; 191 192 ctx->dev = my_alg->dev; 193 ctx->is_hash = 1; 194 ctx->hash_final = 0; 195 196 /* Create SA */ 197 if (ctx->sa_in_dma_addr || ctx->sa_out_dma_addr) 198 crypto4xx_free_sa(ctx); 199 200 rc = crypto4xx_alloc_sa(ctx, sa_len); 201 if (rc) 202 return rc; 203 204 if (ctx->state_record_dma_addr == 0) { 205 crypto4xx_alloc_state_record(ctx); 206 if (!ctx->state_record_dma_addr) { 207 crypto4xx_free_sa(ctx); 208 return -ENOMEM; 209 } 210 } 211 212 crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm), 213 sizeof(struct crypto4xx_ctx)); 214 sa = (struct dynamic_sa_ctl *) ctx->sa_in; 215 set_dynamic_sa_command_0(sa, SA_SAVE_HASH, SA_NOT_SAVE_IV, 216 SA_NOT_LOAD_HASH, SA_LOAD_IV_FROM_SA, 217 SA_NO_HEADER_PROC, ha, SA_CIPHER_ALG_NULL, 218 SA_PAD_TYPE_ZERO, SA_OP_GROUP_BASIC, 219 SA_OPCODE_HASH, DIR_INBOUND); 220 set_dynamic_sa_command_1(sa, 0, SA_HASH_MODE_HASH, 221 CRYPTO_FEEDBACK_MODE_NO_FB, SA_EXTENDED_SN_OFF, 222 SA_SEQ_MASK_OFF, SA_MC_ENABLE, 223 SA_NOT_COPY_PAD, SA_NOT_COPY_PAYLOAD, 224 SA_NOT_COPY_HDR); 225 ctx->direction = DIR_INBOUND; 226 sa->sa_contents = SA_HASH160_CONTENTS; 227 sa_in = (struct dynamic_sa_hash160 *) ctx->sa_in; 228 /* Need to zero hash digest in SA */ 229 memset(sa_in->inner_digest, 0, sizeof(sa_in->inner_digest)); 230 memset(sa_in->outer_digest, 0, sizeof(sa_in->outer_digest)); 231 sa_in->state_ptr = ctx->state_record_dma_addr; 232 ctx->offset_to_sr_ptr = get_dynamic_sa_offset_state_ptr_field(ctx); 233 234 return 0; 235 } 236 237 int crypto4xx_hash_init(struct ahash_request *req) 238 { 239 struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm); 240 int ds; 241 struct dynamic_sa_ctl *sa; 242 243 sa = (struct dynamic_sa_ctl *) ctx->sa_in; 244 ds = crypto_ahash_digestsize( 245 __crypto_ahash_cast(req->base.tfm)); 246 sa->sa_command_0.bf.digest_len = ds >> 2; 247 sa->sa_command_0.bf.load_hash_state = SA_LOAD_HASH_FROM_SA; 248 ctx->is_hash = 1; 249 ctx->direction = DIR_INBOUND; 250 251 return 0; 252 } 253 254 int crypto4xx_hash_update(struct ahash_request *req) 255 { 256 struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm); 257 258 ctx->is_hash = 1; 259 ctx->hash_final = 0; 260 ctx->pd_ctl = 0x11; 261 ctx->direction = DIR_INBOUND; 262 263 return crypto4xx_build_pd(&req->base, ctx, req->src, 264 (struct scatterlist *) req->result, 265 req->nbytes, NULL, 0); 266 } 267 268 int crypto4xx_hash_final(struct ahash_request *req) 269 { 270 return 0; 271 } 272 273 int crypto4xx_hash_digest(struct ahash_request *req) 274 { 275 struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm); 276 277 ctx->hash_final = 1; 278 ctx->pd_ctl = 0x11; 279 ctx->direction = DIR_INBOUND; 280 281 return crypto4xx_build_pd(&req->base, ctx, req->src, 282 (struct scatterlist *) req->result, 283 req->nbytes, NULL, 0); 284 } 285 286 /** 287 * SHA1 Algorithm 288 */ 289 int crypto4xx_sha1_alg_init(struct crypto_tfm *tfm) 290 { 291 return crypto4xx_hash_alg_init(tfm, SA_HASH160_LEN, SA_HASH_ALG_SHA1, 292 SA_HASH_MODE_HASH); 293 } 294 295 296