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->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 86 int 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->is_hash = 0; 92 ctx->pd_ctl = 1; 93 94 return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst, 95 req->nbytes, req->info, 96 get_dynamic_sa_iv_size(ctx)); 97 } 98 99 /** 100 * AES Functions 101 */ 102 static int crypto4xx_setkey_aes(struct crypto_ablkcipher *cipher, 103 const u8 *key, 104 unsigned int keylen, 105 unsigned char cm, 106 u8 fb) 107 { 108 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher); 109 struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm); 110 struct dynamic_sa_ctl *sa; 111 int rc; 112 113 if (keylen != AES_KEYSIZE_256 && 114 keylen != AES_KEYSIZE_192 && keylen != AES_KEYSIZE_128) { 115 crypto_ablkcipher_set_flags(cipher, 116 CRYPTO_TFM_RES_BAD_KEY_LEN); 117 return -EINVAL; 118 } 119 120 /* Create SA */ 121 if (ctx->sa_in_dma_addr || ctx->sa_out_dma_addr) 122 crypto4xx_free_sa(ctx); 123 124 rc = crypto4xx_alloc_sa(ctx, SA_AES128_LEN + (keylen-16) / 4); 125 if (rc) 126 return rc; 127 128 if (ctx->state_record_dma_addr == 0) { 129 rc = crypto4xx_alloc_state_record(ctx); 130 if (rc) { 131 crypto4xx_free_sa(ctx); 132 return rc; 133 } 134 } 135 /* Setup SA */ 136 sa = (struct dynamic_sa_ctl *) ctx->sa_in; 137 138 set_dynamic_sa_command_0(sa, SA_NOT_SAVE_HASH, SA_NOT_SAVE_IV, 139 SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE, 140 SA_NO_HEADER_PROC, SA_HASH_ALG_NULL, 141 SA_CIPHER_ALG_AES, SA_PAD_TYPE_ZERO, 142 SA_OP_GROUP_BASIC, SA_OPCODE_DECRYPT, 143 DIR_INBOUND); 144 145 set_dynamic_sa_command_1(sa, cm, SA_HASH_MODE_HASH, 146 fb, SA_EXTENDED_SN_OFF, 147 SA_SEQ_MASK_OFF, SA_MC_ENABLE, 148 SA_NOT_COPY_PAD, SA_NOT_COPY_PAYLOAD, 149 SA_NOT_COPY_HDR); 150 crypto4xx_memcpy_le(ctx->sa_in + get_dynamic_sa_offset_key_field(ctx), 151 key, keylen); 152 sa->sa_contents.w = SA_AES_CONTENTS | (keylen << 2); 153 sa->sa_command_1.bf.key_len = keylen >> 3; 154 ctx->is_hash = 0; 155 ctx->direction = DIR_INBOUND; 156 memcpy(ctx->sa_in + get_dynamic_sa_offset_state_ptr_field(ctx), 157 (void *)&ctx->state_record_dma_addr, 4); 158 ctx->offset_to_sr_ptr = get_dynamic_sa_offset_state_ptr_field(ctx); 159 160 memcpy(ctx->sa_out, ctx->sa_in, ctx->sa_len * 4); 161 sa = (struct dynamic_sa_ctl *) ctx->sa_out; 162 sa->sa_command_0.bf.dir = DIR_OUTBOUND; 163 164 return 0; 165 } 166 167 int crypto4xx_setkey_aes_cbc(struct crypto_ablkcipher *cipher, 168 const u8 *key, unsigned int keylen) 169 { 170 return crypto4xx_setkey_aes(cipher, key, keylen, CRYPTO_MODE_CBC, 171 CRYPTO_FEEDBACK_MODE_NO_FB); 172 } 173 174 /** 175 * HASH SHA1 Functions 176 */ 177 static int crypto4xx_hash_alg_init(struct crypto_tfm *tfm, 178 unsigned int sa_len, 179 unsigned char ha, 180 unsigned char hm) 181 { 182 struct crypto_alg *alg = tfm->__crt_alg; 183 struct crypto4xx_alg *my_alg = crypto_alg_to_crypto4xx_alg(alg); 184 struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm); 185 struct dynamic_sa_ctl *sa; 186 struct dynamic_sa_hash160 *sa_in; 187 int rc; 188 189 ctx->dev = my_alg->dev; 190 ctx->is_hash = 1; 191 192 /* Create SA */ 193 if (ctx->sa_in_dma_addr || ctx->sa_out_dma_addr) 194 crypto4xx_free_sa(ctx); 195 196 rc = crypto4xx_alloc_sa(ctx, sa_len); 197 if (rc) 198 return rc; 199 200 if (ctx->state_record_dma_addr == 0) { 201 crypto4xx_alloc_state_record(ctx); 202 if (!ctx->state_record_dma_addr) { 203 crypto4xx_free_sa(ctx); 204 return -ENOMEM; 205 } 206 } 207 208 crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm), 209 sizeof(struct crypto4xx_ctx)); 210 sa = (struct dynamic_sa_ctl *) ctx->sa_in; 211 set_dynamic_sa_command_0(sa, SA_SAVE_HASH, SA_NOT_SAVE_IV, 212 SA_NOT_LOAD_HASH, SA_LOAD_IV_FROM_SA, 213 SA_NO_HEADER_PROC, ha, SA_CIPHER_ALG_NULL, 214 SA_PAD_TYPE_ZERO, SA_OP_GROUP_BASIC, 215 SA_OPCODE_HASH, DIR_INBOUND); 216 set_dynamic_sa_command_1(sa, 0, SA_HASH_MODE_HASH, 217 CRYPTO_FEEDBACK_MODE_NO_FB, SA_EXTENDED_SN_OFF, 218 SA_SEQ_MASK_OFF, SA_MC_ENABLE, 219 SA_NOT_COPY_PAD, SA_NOT_COPY_PAYLOAD, 220 SA_NOT_COPY_HDR); 221 ctx->direction = DIR_INBOUND; 222 sa->sa_contents.w = SA_HASH160_CONTENTS; 223 sa_in = (struct dynamic_sa_hash160 *) ctx->sa_in; 224 /* Need to zero hash digest in SA */ 225 memset(sa_in->inner_digest, 0, sizeof(sa_in->inner_digest)); 226 memset(sa_in->outer_digest, 0, sizeof(sa_in->outer_digest)); 227 sa_in->state_ptr = ctx->state_record_dma_addr; 228 ctx->offset_to_sr_ptr = get_dynamic_sa_offset_state_ptr_field(ctx); 229 230 return 0; 231 } 232 233 int crypto4xx_hash_init(struct ahash_request *req) 234 { 235 struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm); 236 int ds; 237 struct dynamic_sa_ctl *sa; 238 239 sa = (struct dynamic_sa_ctl *) ctx->sa_in; 240 ds = crypto_ahash_digestsize( 241 __crypto_ahash_cast(req->base.tfm)); 242 sa->sa_command_0.bf.digest_len = ds >> 2; 243 sa->sa_command_0.bf.load_hash_state = SA_LOAD_HASH_FROM_SA; 244 ctx->is_hash = 1; 245 ctx->direction = DIR_INBOUND; 246 247 return 0; 248 } 249 250 int crypto4xx_hash_update(struct ahash_request *req) 251 { 252 struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm); 253 254 ctx->is_hash = 1; 255 ctx->pd_ctl = 0x11; 256 ctx->direction = DIR_INBOUND; 257 258 return crypto4xx_build_pd(&req->base, ctx, req->src, 259 (struct scatterlist *) req->result, 260 req->nbytes, NULL, 0); 261 } 262 263 int crypto4xx_hash_final(struct ahash_request *req) 264 { 265 return 0; 266 } 267 268 int crypto4xx_hash_digest(struct ahash_request *req) 269 { 270 struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm); 271 272 ctx->pd_ctl = 0x11; 273 ctx->direction = DIR_INBOUND; 274 275 return crypto4xx_build_pd(&req->base, ctx, req->src, 276 (struct scatterlist *) req->result, 277 req->nbytes, NULL, 0); 278 } 279 280 /** 281 * SHA1 Algorithm 282 */ 283 int crypto4xx_sha1_alg_init(struct crypto_tfm *tfm) 284 { 285 return crypto4xx_hash_alg_init(tfm, SA_HASH160_LEN, SA_HASH_ALG_SHA1, 286 SA_HASH_MODE_HASH); 287 } 288 289 290