1 /** 2 * SHA-256 routines supporting the Power 7+ Nest Accelerators driver 3 * 4 * Copyright (C) 2011-2012 International Business Machines Inc. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; version 2 only. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 18 * 19 * Author: Kent Yoder <yoder1@us.ibm.com> 20 */ 21 22 #include <crypto/internal/hash.h> 23 #include <crypto/sha.h> 24 #include <linux/module.h> 25 #include <asm/vio.h> 26 27 #include "nx_csbcpb.h" 28 #include "nx.h" 29 30 31 static int nx_sha256_init(struct shash_desc *desc) 32 { 33 struct sha256_state *sctx = shash_desc_ctx(desc); 34 struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base); 35 struct nx_sg *out_sg; 36 37 nx_ctx_init(nx_ctx, HCOP_FC_SHA); 38 39 memset(sctx, 0, sizeof *sctx); 40 41 nx_ctx->ap = &nx_ctx->props[NX_PROPS_SHA256]; 42 43 NX_CPB_SET_DIGEST_SIZE(nx_ctx->csbcpb, NX_DS_SHA256); 44 out_sg = nx_build_sg_list(nx_ctx->out_sg, (u8 *)sctx->state, 45 SHA256_DIGEST_SIZE, nx_ctx->ap->sglen); 46 nx_ctx->op.outlen = (nx_ctx->out_sg - out_sg) * sizeof(struct nx_sg); 47 48 return 0; 49 } 50 51 static int nx_sha256_update(struct shash_desc *desc, const u8 *data, 52 unsigned int len) 53 { 54 struct sha256_state *sctx = shash_desc_ctx(desc); 55 struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base); 56 struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb; 57 struct nx_sg *in_sg; 58 u64 to_process, leftover, total; 59 u32 max_sg_len; 60 int rc = 0; 61 62 /* 2 cases for total data len: 63 * 1: < SHA256_BLOCK_SIZE: copy into state, return 0 64 * 2: >= SHA256_BLOCK_SIZE: process X blocks, copy in leftover 65 */ 66 total = sctx->count + len; 67 if (total < SHA256_BLOCK_SIZE) { 68 memcpy(sctx->buf + sctx->count, data, len); 69 sctx->count += len; 70 goto out; 71 } 72 73 in_sg = nx_ctx->in_sg; 74 max_sg_len = min_t(u32, nx_driver.of.max_sg_len/sizeof(struct nx_sg), 75 nx_ctx->ap->sglen); 76 77 do { 78 /* 79 * to_process: the SHA256_BLOCK_SIZE data chunk to process in 80 * this update. This value is also restricted by the sg list 81 * limits. 82 */ 83 to_process = min_t(u64, total, nx_ctx->ap->databytelen); 84 to_process = min_t(u64, to_process, 85 NX_PAGE_SIZE * (max_sg_len - 1)); 86 to_process = to_process & ~(SHA256_BLOCK_SIZE - 1); 87 leftover = total - to_process; 88 89 if (sctx->count) { 90 in_sg = nx_build_sg_list(nx_ctx->in_sg, 91 (u8 *) sctx->buf, 92 sctx->count, max_sg_len); 93 } 94 in_sg = nx_build_sg_list(in_sg, (u8 *) data, 95 to_process - sctx->count, 96 max_sg_len); 97 nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) * 98 sizeof(struct nx_sg); 99 100 if (NX_CPB_FDM(csbcpb) & NX_FDM_CONTINUATION) { 101 /* 102 * we've hit the nx chip previously and we're updating 103 * again, so copy over the partial digest. 104 */ 105 memcpy(csbcpb->cpb.sha256.input_partial_digest, 106 csbcpb->cpb.sha256.message_digest, 107 SHA256_DIGEST_SIZE); 108 } 109 110 NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE; 111 if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) { 112 rc = -EINVAL; 113 goto out; 114 } 115 116 rc = nx_hcall_sync(nx_ctx, &nx_ctx->op, 117 desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP); 118 if (rc) 119 goto out; 120 121 atomic_inc(&(nx_ctx->stats->sha256_ops)); 122 csbcpb->cpb.sha256.message_bit_length += (u64) 123 (csbcpb->cpb.sha256.spbc * 8); 124 125 /* everything after the first update is continuation */ 126 NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION; 127 128 total -= to_process; 129 data += to_process; 130 sctx->count = 0; 131 in_sg = nx_ctx->in_sg; 132 } while (leftover >= SHA256_BLOCK_SIZE); 133 134 /* copy the leftover back into the state struct */ 135 if (leftover) 136 memcpy(sctx->buf, data, leftover); 137 sctx->count = leftover; 138 out: 139 return rc; 140 } 141 142 static int nx_sha256_final(struct shash_desc *desc, u8 *out) 143 { 144 struct sha256_state *sctx = shash_desc_ctx(desc); 145 struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base); 146 struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb; 147 struct nx_sg *in_sg, *out_sg; 148 u32 max_sg_len; 149 int rc; 150 151 max_sg_len = min_t(u32, nx_driver.of.max_sg_len, nx_ctx->ap->sglen); 152 153 if (NX_CPB_FDM(csbcpb) & NX_FDM_CONTINUATION) { 154 /* we've hit the nx chip previously, now we're finalizing, 155 * so copy over the partial digest */ 156 memcpy(csbcpb->cpb.sha256.input_partial_digest, 157 csbcpb->cpb.sha256.message_digest, SHA256_DIGEST_SIZE); 158 } 159 160 /* final is represented by continuing the operation and indicating that 161 * this is not an intermediate operation */ 162 NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE; 163 164 csbcpb->cpb.sha256.message_bit_length += (u64)(sctx->count * 8); 165 166 in_sg = nx_build_sg_list(nx_ctx->in_sg, (u8 *)sctx->buf, 167 sctx->count, max_sg_len); 168 out_sg = nx_build_sg_list(nx_ctx->out_sg, out, SHA256_DIGEST_SIZE, 169 max_sg_len); 170 nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) * sizeof(struct nx_sg); 171 nx_ctx->op.outlen = (nx_ctx->out_sg - out_sg) * sizeof(struct nx_sg); 172 173 if (!nx_ctx->op.outlen) { 174 rc = -EINVAL; 175 goto out; 176 } 177 178 rc = nx_hcall_sync(nx_ctx, &nx_ctx->op, 179 desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP); 180 if (rc) 181 goto out; 182 183 atomic_inc(&(nx_ctx->stats->sha256_ops)); 184 185 atomic64_add(csbcpb->cpb.sha256.message_bit_length / 8, 186 &(nx_ctx->stats->sha256_bytes)); 187 memcpy(out, csbcpb->cpb.sha256.message_digest, SHA256_DIGEST_SIZE); 188 out: 189 return rc; 190 } 191 192 static int nx_sha256_export(struct shash_desc *desc, void *out) 193 { 194 struct sha256_state *sctx = shash_desc_ctx(desc); 195 struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base); 196 struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb; 197 struct sha256_state *octx = out; 198 199 octx->count = sctx->count + 200 (csbcpb->cpb.sha256.message_bit_length / 8); 201 memcpy(octx->buf, sctx->buf, sizeof(octx->buf)); 202 203 /* if no data has been processed yet, we need to export SHA256's 204 * initial data, in case this context gets imported into a software 205 * context */ 206 if (csbcpb->cpb.sha256.message_bit_length) 207 memcpy(octx->state, csbcpb->cpb.sha256.message_digest, 208 SHA256_DIGEST_SIZE); 209 else { 210 octx->state[0] = SHA256_H0; 211 octx->state[1] = SHA256_H1; 212 octx->state[2] = SHA256_H2; 213 octx->state[3] = SHA256_H3; 214 octx->state[4] = SHA256_H4; 215 octx->state[5] = SHA256_H5; 216 octx->state[6] = SHA256_H6; 217 octx->state[7] = SHA256_H7; 218 } 219 220 return 0; 221 } 222 223 static int nx_sha256_import(struct shash_desc *desc, const void *in) 224 { 225 struct sha256_state *sctx = shash_desc_ctx(desc); 226 struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base); 227 struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb; 228 const struct sha256_state *ictx = in; 229 230 memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf)); 231 232 sctx->count = ictx->count & 0x3f; 233 csbcpb->cpb.sha256.message_bit_length = (ictx->count & ~0x3f) * 8; 234 235 if (csbcpb->cpb.sha256.message_bit_length) { 236 memcpy(csbcpb->cpb.sha256.message_digest, ictx->state, 237 SHA256_DIGEST_SIZE); 238 239 NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION; 240 NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE; 241 } 242 243 return 0; 244 } 245 246 struct shash_alg nx_shash_sha256_alg = { 247 .digestsize = SHA256_DIGEST_SIZE, 248 .init = nx_sha256_init, 249 .update = nx_sha256_update, 250 .final = nx_sha256_final, 251 .export = nx_sha256_export, 252 .import = nx_sha256_import, 253 .descsize = sizeof(struct sha256_state), 254 .statesize = sizeof(struct sha256_state), 255 .base = { 256 .cra_name = "sha256", 257 .cra_driver_name = "sha256-nx", 258 .cra_priority = 300, 259 .cra_flags = CRYPTO_ALG_TYPE_SHASH, 260 .cra_blocksize = SHA256_BLOCK_SIZE, 261 .cra_module = THIS_MODULE, 262 .cra_ctxsize = sizeof(struct nx_crypto_ctx), 263 .cra_init = nx_crypto_ctx_sha_init, 264 .cra_exit = nx_crypto_ctx_exit, 265 } 266 }; 267