1 /** 2 * SHA-512 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_sha512_init(struct shash_desc *desc) 32 { 33 struct sha512_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_SHA512]; 42 43 NX_CPB_SET_DIGEST_SIZE(nx_ctx->csbcpb, NX_DS_SHA512); 44 out_sg = nx_build_sg_list(nx_ctx->out_sg, (u8 *)sctx->state, 45 SHA512_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_sha512_update(struct shash_desc *desc, const u8 *data, 52 unsigned int len) 53 { 54 struct sha512_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, spbc_bits; 59 int rc = 0; 60 61 if (NX_CPB_FDM(csbcpb) & NX_FDM_CONTINUATION) { 62 /* we've hit the nx chip previously and we're updating again, 63 * so copy over the partial digest */ 64 memcpy(csbcpb->cpb.sha512.input_partial_digest, 65 csbcpb->cpb.sha512.message_digest, SHA512_DIGEST_SIZE); 66 } 67 68 /* 2 cases for total data len: 69 * 1: <= SHA512_BLOCK_SIZE: copy into state, return 0 70 * 2: > SHA512_BLOCK_SIZE: process X blocks, copy in leftover 71 */ 72 if ((u64)len + sctx->count[0] < SHA512_BLOCK_SIZE) { 73 memcpy(sctx->buf + sctx->count[0], data, len); 74 sctx->count[0] += len; 75 goto out; 76 } 77 78 /* to_process: the SHA512_BLOCK_SIZE data chunk to process in this 79 * update */ 80 to_process = (sctx->count[0] + len) & ~(SHA512_BLOCK_SIZE - 1); 81 leftover = (sctx->count[0] + len) & (SHA512_BLOCK_SIZE - 1); 82 83 if (sctx->count[0]) { 84 in_sg = nx_build_sg_list(nx_ctx->in_sg, (u8 *)sctx->buf, 85 sctx->count[0], nx_ctx->ap->sglen); 86 in_sg = nx_build_sg_list(in_sg, (u8 *)data, 87 to_process - sctx->count[0], 88 nx_ctx->ap->sglen); 89 nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) * 90 sizeof(struct nx_sg); 91 } else { 92 in_sg = nx_build_sg_list(nx_ctx->in_sg, (u8 *)data, 93 to_process, nx_ctx->ap->sglen); 94 nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) * 95 sizeof(struct nx_sg); 96 } 97 98 NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE; 99 100 if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) { 101 rc = -EINVAL; 102 goto out; 103 } 104 105 rc = nx_hcall_sync(nx_ctx, &nx_ctx->op, 106 desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP); 107 if (rc) 108 goto out; 109 110 atomic_inc(&(nx_ctx->stats->sha512_ops)); 111 112 /* copy the leftover back into the state struct */ 113 if (leftover) 114 memcpy(sctx->buf, data + len - leftover, leftover); 115 sctx->count[0] = leftover; 116 117 spbc_bits = csbcpb->cpb.sha512.spbc * 8; 118 csbcpb->cpb.sha512.message_bit_length_lo += spbc_bits; 119 if (csbcpb->cpb.sha512.message_bit_length_lo < spbc_bits) 120 csbcpb->cpb.sha512.message_bit_length_hi++; 121 122 /* everything after the first update is continuation */ 123 NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION; 124 out: 125 return rc; 126 } 127 128 static int nx_sha512_final(struct shash_desc *desc, u8 *out) 129 { 130 struct sha512_state *sctx = shash_desc_ctx(desc); 131 struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base); 132 struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb; 133 struct nx_sg *in_sg, *out_sg; 134 u64 count0; 135 int rc; 136 137 if (NX_CPB_FDM(csbcpb) & NX_FDM_CONTINUATION) { 138 /* we've hit the nx chip previously, now we're finalizing, 139 * so copy over the partial digest */ 140 memcpy(csbcpb->cpb.sha512.input_partial_digest, 141 csbcpb->cpb.sha512.message_digest, SHA512_DIGEST_SIZE); 142 } 143 144 /* final is represented by continuing the operation and indicating that 145 * this is not an intermediate operation */ 146 NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE; 147 148 count0 = sctx->count[0] * 8; 149 150 csbcpb->cpb.sha512.message_bit_length_lo += count0; 151 if (csbcpb->cpb.sha512.message_bit_length_lo < count0) 152 csbcpb->cpb.sha512.message_bit_length_hi++; 153 154 in_sg = nx_build_sg_list(nx_ctx->in_sg, sctx->buf, sctx->count[0], 155 nx_ctx->ap->sglen); 156 out_sg = nx_build_sg_list(nx_ctx->out_sg, out, SHA512_DIGEST_SIZE, 157 nx_ctx->ap->sglen); 158 nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) * sizeof(struct nx_sg); 159 nx_ctx->op.outlen = (nx_ctx->out_sg - out_sg) * sizeof(struct nx_sg); 160 161 if (!nx_ctx->op.outlen) { 162 rc = -EINVAL; 163 goto out; 164 } 165 166 rc = nx_hcall_sync(nx_ctx, &nx_ctx->op, 167 desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP); 168 if (rc) 169 goto out; 170 171 atomic_inc(&(nx_ctx->stats->sha512_ops)); 172 atomic64_add(csbcpb->cpb.sha512.message_bit_length_lo / 8, 173 &(nx_ctx->stats->sha512_bytes)); 174 175 memcpy(out, csbcpb->cpb.sha512.message_digest, SHA512_DIGEST_SIZE); 176 out: 177 return rc; 178 } 179 180 static int nx_sha512_export(struct shash_desc *desc, void *out) 181 { 182 struct sha512_state *sctx = shash_desc_ctx(desc); 183 struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base); 184 struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb; 185 struct sha512_state *octx = out; 186 187 /* move message_bit_length (128 bits) into count and convert its value 188 * to bytes */ 189 octx->count[0] = csbcpb->cpb.sha512.message_bit_length_lo >> 3 | 190 ((csbcpb->cpb.sha512.message_bit_length_hi & 7) << 61); 191 octx->count[1] = csbcpb->cpb.sha512.message_bit_length_hi >> 3; 192 193 octx->count[0] += sctx->count[0]; 194 if (octx->count[0] < sctx->count[0]) 195 octx->count[1]++; 196 197 memcpy(octx->buf, sctx->buf, sizeof(octx->buf)); 198 199 /* if no data has been processed yet, we need to export SHA512's 200 * initial data, in case this context gets imported into a software 201 * context */ 202 if (csbcpb->cpb.sha512.message_bit_length_hi || 203 csbcpb->cpb.sha512.message_bit_length_lo) 204 memcpy(octx->state, csbcpb->cpb.sha512.message_digest, 205 SHA512_DIGEST_SIZE); 206 else { 207 octx->state[0] = SHA512_H0; 208 octx->state[1] = SHA512_H1; 209 octx->state[2] = SHA512_H2; 210 octx->state[3] = SHA512_H3; 211 octx->state[4] = SHA512_H4; 212 octx->state[5] = SHA512_H5; 213 octx->state[6] = SHA512_H6; 214 octx->state[7] = SHA512_H7; 215 } 216 217 return 0; 218 } 219 220 static int nx_sha512_import(struct shash_desc *desc, const void *in) 221 { 222 struct sha512_state *sctx = shash_desc_ctx(desc); 223 struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base); 224 struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb; 225 const struct sha512_state *ictx = in; 226 227 memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf)); 228 sctx->count[0] = ictx->count[0] & 0x3f; 229 csbcpb->cpb.sha512.message_bit_length_lo = (ictx->count[0] & ~0x3f) 230 << 3; 231 csbcpb->cpb.sha512.message_bit_length_hi = ictx->count[1] << 3 | 232 ictx->count[0] >> 61; 233 234 if (csbcpb->cpb.sha512.message_bit_length_hi || 235 csbcpb->cpb.sha512.message_bit_length_lo) { 236 memcpy(csbcpb->cpb.sha512.message_digest, ictx->state, 237 SHA512_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_sha512_alg = { 247 .digestsize = SHA512_DIGEST_SIZE, 248 .init = nx_sha512_init, 249 .update = nx_sha512_update, 250 .final = nx_sha512_final, 251 .export = nx_sha512_export, 252 .import = nx_sha512_import, 253 .descsize = sizeof(struct sha512_state), 254 .statesize = sizeof(struct sha512_state), 255 .base = { 256 .cra_name = "sha512", 257 .cra_driver_name = "sha512-nx", 258 .cra_priority = 300, 259 .cra_flags = CRYPTO_ALG_TYPE_SHASH, 260 .cra_blocksize = SHA512_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