drivers/s390/crypto/zcrypt_cca_key.h

   1 /*
   2  *  zcrypt 2.1.0
   3  *
   4  *  Copyright IBM Corp. 2001, 2006
   5  *  Author(s): Robert Burroughs
   6  *             Eric Rossman (edrossma@us.ibm.com)
   7  *
   8  *  Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
   9  *  Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2, or (at your option)
  14  * any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24  */
  25
  26 #ifndef _ZCRYPT_CCA_KEY_H_
  27 #define _ZCRYPT_CCA_KEY_H_
  28
  29 struct T6_keyBlock_hdr {
  30         unsigned short blen;
  31         unsigned short ulen;
  32         unsigned short flags;
  33 };
  34
  35 /**
  36  * mapping for the cca private ME key token.
  37  * Three parts of interest here: the header, the private section and
  38  * the public section.
  39  *
  40  * mapping for the cca key token header
  41  */
  42 struct cca_token_hdr {
  43         unsigned char  token_identifier;
  44         unsigned char  version;
  45         unsigned short token_length;
  46         unsigned char  reserved[4];
  47 } __attribute__((packed));
  48
  49 #define CCA_TKN_HDR_ID_EXT 0x1E
  50
  51 /**
  52  * mapping for the cca private ME section
  53  */
  54 struct cca_private_ext_ME_sec {
  55         unsigned char  section_identifier;
  56         unsigned char  version;
  57         unsigned short section_length;
  58         unsigned char  private_key_hash[20];
  59         unsigned char  reserved1[4];
  60         unsigned char  key_format;
  61         unsigned char  reserved2;
  62         unsigned char  key_name_hash[20];
  63         unsigned char  key_use_flags[4];
  64         unsigned char  reserved3[6];
  65         unsigned char  reserved4[24];
  66         unsigned char  confounder[24];
  67         unsigned char  exponent[128];
  68         unsigned char  modulus[128];
  69 } __attribute__((packed));
  70
  71 #define CCA_PVT_USAGE_ALL 0x80
  72
  73 /**
  74  * mapping for the cca public section
  75  * In a private key, the modulus doesn't appear in the public
  76  * section. So, an arbitrary public exponent of 0x010001 will be
  77  * used, for a section length of 0x0F always.
  78  */
  79 struct cca_public_sec {
  80         unsigned char  section_identifier;
  81         unsigned char  version;
  82         unsigned short section_length;
  83         unsigned char  reserved[2];
  84         unsigned short exponent_len;
  85         unsigned short modulus_bit_len;
  86         unsigned short modulus_byte_len;    /* In a private key, this is 0 */
  87 } __attribute__((packed));
  88
  89 /**
  90  * mapping for the cca private CRT key 'token'
  91  * The first three parts (the only parts considered in this release)
  92  * are: the header, the private section and the public section.
  93  * The header and public section are the same as for the
  94  * struct cca_private_ext_ME
  95  *
  96  * Following the structure are the quantities p, q, dp, dq, u, pad,
  97  * and modulus, in that order, where pad_len is the modulo 8
  98  * complement of the residue modulo 8 of the sum of
  99  * (p_len + q_len + dp_len + dq_len + u_len).
 100  */
 101 struct cca_pvt_ext_CRT_sec {
 102         unsigned char  section_identifier;
 103         unsigned char  version;
 104         unsigned short section_length;
 105         unsigned char  private_key_hash[20];
 106         unsigned char  reserved1[4];
 107         unsigned char  key_format;
 108         unsigned char  reserved2;
 109         unsigned char  key_name_hash[20];
 110         unsigned char  key_use_flags[4];
 111         unsigned short p_len;
 112         unsigned short q_len;
 113         unsigned short dp_len;
 114         unsigned short dq_len;
 115         unsigned short u_len;
 116         unsigned short mod_len;
 117         unsigned char  reserved3[4];
 118         unsigned short pad_len;
 119         unsigned char  reserved4[52];
 120         unsigned char  confounder[8];
 121 } __attribute__((packed));
 122
 123 #define CCA_PVT_EXT_CRT_SEC_ID_PVT 0x08
 124 #define CCA_PVT_EXT_CRT_SEC_FMT_CL 0x40
 125
 126 /**
 127  * Set up private key fields of a type6 MEX message.
 128  * Note that all numerics in the key token are big-endian,
 129  * while the entries in the key block header are little-endian.
 130  *
 131  * @mex: pointer to user input data
 132  * @p: pointer to memory area for the key
 133  *
 134  * Returns the size of the key area or -EFAULT
 135  */
 136 static inline int zcrypt_type6_mex_key_de(struct ica_rsa_modexpo *mex,
 137                                           void *p, int big_endian)
 138 {
 139         static struct cca_token_hdr static_pvt_me_hdr = {
 140                 .token_identifier       =  0x1E,
 141                 .token_length           =  0x0183,
 142         };
 143         static struct cca_private_ext_ME_sec static_pvt_me_sec = {
 144                 .section_identifier     =  0x02,
 145                 .section_length         =  0x016C,
 146                 .key_use_flags          = {0x80,0x00,0x00,0x00},
 147         };
 148         static struct cca_public_sec static_pub_me_sec = {
 149                 .section_identifier     =  0x04,
 150                 .section_length         =  0x000F,
 151                 .exponent_len           =  0x0003,
 152         };
 153         static char pk_exponent[3] = { 0x01, 0x00, 0x01 };
 154         struct {
 155                 struct T6_keyBlock_hdr t6_hdr;
 156                 struct cca_token_hdr pvtMeHdr;
 157                 struct cca_private_ext_ME_sec pvtMeSec;
 158                 struct cca_public_sec pubMeSec;
 159                 char exponent[3];
 160         } __attribute__((packed)) *key = p;
 161         unsigned char *temp;
 162
 163         memset(key, 0, sizeof(*key));
 164
 165         if (big_endian) {
 166                 key->t6_hdr.blen = cpu_to_be16(0x189);
 167                 key->t6_hdr.ulen = cpu_to_be16(0x189 - 2);
 168         } else {
 169                 key->t6_hdr.blen = cpu_to_le16(0x189);
 170                 key->t6_hdr.ulen = cpu_to_le16(0x189 - 2);
 171         }
 172         key->pvtMeHdr = static_pvt_me_hdr;
 173         key->pvtMeSec = static_pvt_me_sec;
 174         key->pubMeSec = static_pub_me_sec;
 175         /*
 176          * In a private key, the modulus doesn't appear in the public
 177          * section. So, an arbitrary public exponent of 0x010001 will be
 178          * used.
 179          */
 180         memcpy(key->exponent, pk_exponent, 3);
 181
 182         /* key parameter block */
 183         temp = key->pvtMeSec.exponent +
 184                 sizeof(key->pvtMeSec.exponent) - mex->inputdatalength;
 185         if (copy_from_user(temp, mex->b_key, mex->inputdatalength))
 186                 return -EFAULT;
 187
 188         /* modulus */
 189         temp = key->pvtMeSec.modulus +
 190                 sizeof(key->pvtMeSec.modulus) - mex->inputdatalength;
 191         if (copy_from_user(temp, mex->n_modulus, mex->inputdatalength))
 192                 return -EFAULT;
 193         key->pubMeSec.modulus_bit_len = 8 * mex->inputdatalength;
 194         return sizeof(*key);
 195 }
 196
 197 /**
 198  * Set up private key fields of a type6 MEX message. The _pad variant
 199  * strips leading zeroes from the b_key.
 200  * Note that all numerics in the key token are big-endian,
 201  * while the entries in the key block header are little-endian.
 202  *
 203  * @mex: pointer to user input data
 204  * @p: pointer to memory area for the key
 205  *
 206  * Returns the size of the key area or -EFAULT
 207  */
 208 static inline int zcrypt_type6_mex_key_en(struct ica_rsa_modexpo *mex,
 209                                           void *p, int big_endian)
 210 {
 211         static struct cca_token_hdr static_pub_hdr = {
 212                 .token_identifier       =  0x1E,
 213         };
 214         static struct cca_public_sec static_pub_sec = {
 215                 .section_identifier     =  0x04,
 216         };
 217         struct {
 218                 struct T6_keyBlock_hdr t6_hdr;
 219                 struct cca_token_hdr pubHdr;
 220                 struct cca_public_sec pubSec;
 221                 char exponent[0];
 222         } __attribute__((packed)) *key = p;
 223         unsigned char *temp;
 224         int i;
 225
 226         memset(key, 0, sizeof(*key));
 227
 228         key->pubHdr = static_pub_hdr;
 229         key->pubSec = static_pub_sec;
 230
 231         /* key parameter block */
 232         temp = key->exponent;
 233         if (copy_from_user(temp, mex->b_key, mex->inputdatalength))
 234                 return -EFAULT;
 235         /* Strip leading zeroes from b_key. */
 236         for (i = 0; i < mex->inputdatalength; i++)
 237                 if (temp[i])
 238                         break;
 239         if (i >= mex->inputdatalength)
 240                 return -EINVAL;
 241         memmove(temp, temp + i, mex->inputdatalength - i);
 242         temp += mex->inputdatalength - i;
 243         /* modulus */
 244         if (copy_from_user(temp, mex->n_modulus, mex->inputdatalength))
 245                 return -EFAULT;
 246
 247         key->pubSec.modulus_bit_len = 8 * mex->inputdatalength;
 248         key->pubSec.modulus_byte_len = mex->inputdatalength;
 249         key->pubSec.exponent_len = mex->inputdatalength - i;
 250         key->pubSec.section_length = sizeof(key->pubSec) +
 251                                         2*mex->inputdatalength - i;
 252         key->pubHdr.token_length =
 253                 key->pubSec.section_length + sizeof(key->pubHdr);
 254         if (big_endian) {
 255                 key->t6_hdr.ulen = cpu_to_be16(key->pubHdr.token_length + 4);
 256                 key->t6_hdr.blen = cpu_to_be16(key->pubHdr.token_length + 6);
 257         } else {
 258                 key->t6_hdr.ulen = cpu_to_le16(key->pubHdr.token_length + 4);
 259                 key->t6_hdr.blen = cpu_to_le16(key->pubHdr.token_length + 6);
 260         }
 261         return sizeof(*key) + 2*mex->inputdatalength - i;
 262 }
 263
 264 /**
 265  * Set up private key fields of a type6 CRT message.
 266  * Note that all numerics in the key token are big-endian,
 267  * while the entries in the key block header are little-endian.
 268  *
 269  * @mex: pointer to user input data
 270  * @p: pointer to memory area for the key
 271  *
 272  * Returns the size of the key area or -EFAULT
 273  */
 274 static inline int zcrypt_type6_crt_key(struct ica_rsa_modexpo_crt *crt,
 275                                        void *p, int big_endian)
 276 {
 277         static struct cca_public_sec static_cca_pub_sec = {
 278                 .section_identifier = 4,
 279                 .section_length = 0x000f,
 280                 .exponent_len = 0x0003,
 281         };
 282         static char pk_exponent[3] = { 0x01, 0x00, 0x01 };
 283         struct {
 284                 struct T6_keyBlock_hdr t6_hdr;
 285                 struct cca_token_hdr token;
 286                 struct cca_pvt_ext_CRT_sec pvt;
 287                 char key_parts[0];
 288         } __attribute__((packed)) *key = p;
 289         struct cca_public_sec *pub;
 290         int short_len, long_len, pad_len, key_len, size;
 291
 292         memset(key, 0, sizeof(*key));
 293
 294         short_len = crt->inputdatalength / 2;
 295         long_len = short_len + 8;
 296         pad_len = -(3*long_len + 2*short_len) & 7;
 297         key_len = 3*long_len + 2*short_len + pad_len + crt->inputdatalength;
 298         size = sizeof(*key) + key_len + sizeof(*pub) + 3;
 299
 300         /* parameter block.key block */
 301         if (big_endian) {
 302                 key->t6_hdr.blen = cpu_to_be16(size);
 303                 key->t6_hdr.ulen = cpu_to_be16(size - 2);
 304         } else {
 305                 key->t6_hdr.blen = cpu_to_le16(size);
 306                 key->t6_hdr.ulen = cpu_to_le16(size - 2);
 307         }
 308
 309         /* key token header */
 310         key->token.token_identifier = CCA_TKN_HDR_ID_EXT;
 311         key->token.token_length = size - 6;
 312
 313         /* private section */
 314         key->pvt.section_identifier = CCA_PVT_EXT_CRT_SEC_ID_PVT;
 315         key->pvt.section_length = sizeof(key->pvt) + key_len;
 316         key->pvt.key_format = CCA_PVT_EXT_CRT_SEC_FMT_CL;
 317         key->pvt.key_use_flags[0] = CCA_PVT_USAGE_ALL;
 318         key->pvt.p_len = key->pvt.dp_len = key->pvt.u_len = long_len;
 319         key->pvt.q_len = key->pvt.dq_len = short_len;
 320         key->pvt.mod_len = crt->inputdatalength;
 321         key->pvt.pad_len = pad_len;
 322
 323         /* key parts */
 324         if (copy_from_user(key->key_parts, crt->np_prime, long_len) ||
 325             copy_from_user(key->key_parts + long_len,
 326                                         crt->nq_prime, short_len) ||
 327             copy_from_user(key->key_parts + long_len + short_len,
 328                                         crt->bp_key, long_len) ||
 329             copy_from_user(key->key_parts + 2*long_len + short_len,
 330                                         crt->bq_key, short_len) ||
 331             copy_from_user(key->key_parts + 2*long_len + 2*short_len,
 332                                         crt->u_mult_inv, long_len))
 333                 return -EFAULT;
 334         memset(key->key_parts + 3*long_len + 2*short_len + pad_len,
 335                0xff, crt->inputdatalength);
 336         pub = (struct cca_public_sec *)(key->key_parts + key_len);
 337         *pub = static_cca_pub_sec;
 338         pub->modulus_bit_len = 8 * crt->inputdatalength;
 339         /*
 340          * In a private key, the modulus doesn't appear in the public
 341          * section. So, an arbitrary public exponent of 0x010001 will be
 342          * used.
 343          */
 344         memcpy((char *) (pub + 1), pk_exponent, 3);
 345         return size;
 346 }
 347
 348 #endif /* _ZCRYPT_CCA_KEY_H_ */