1 /* SPDX-License-Identifier: GPL-2.0+ */ 2 /* 3 * Copyright IBM Corp. 2001, 2006 4 * Author(s): Robert Burroughs 5 * Eric Rossman (edrossma@us.ibm.com) 6 * 7 * Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com) 8 * Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com> 9 */ 10 11 #ifndef _ZCRYPT_CCA_KEY_H_ 12 #define _ZCRYPT_CCA_KEY_H_ 13 14 struct t6_keyblock_hdr { 15 unsigned short blen; 16 unsigned short ulen; 17 unsigned short flags; 18 }; 19 20 /** 21 * mapping for the cca private ME key token. 22 * Three parts of interest here: the header, the private section and 23 * the public section. 24 * 25 * mapping for the cca key token header 26 */ 27 struct cca_token_hdr { 28 unsigned char token_identifier; 29 unsigned char version; 30 unsigned short token_length; 31 unsigned char reserved[4]; 32 } __packed; 33 34 #define CCA_TKN_HDR_ID_EXT 0x1E 35 36 #define CCA_PVT_USAGE_ALL 0x80 37 38 /** 39 * mapping for the cca public section 40 * In a private key, the modulus doesn't appear in the public 41 * section. So, an arbitrary public exponent of 0x010001 will be 42 * used, for a section length of 0x0F always. 43 */ 44 struct cca_public_sec { 45 unsigned char section_identifier; 46 unsigned char version; 47 unsigned short section_length; 48 unsigned char reserved[2]; 49 unsigned short exponent_len; 50 unsigned short modulus_bit_len; 51 unsigned short modulus_byte_len; /* In a private key, this is 0 */ 52 } __packed; 53 54 /** 55 * mapping for the cca private CRT key 'token' 56 * The first three parts (the only parts considered in this release) 57 * are: the header, the private section and the public section. 58 * The header and public section are the same as for the 59 * struct cca_private_ext_ME 60 * 61 * Following the structure are the quantities p, q, dp, dq, u, pad, 62 * and modulus, in that order, where pad_len is the modulo 8 63 * complement of the residue modulo 8 of the sum of 64 * (p_len + q_len + dp_len + dq_len + u_len). 65 */ 66 struct cca_pvt_ext_crt_sec { 67 unsigned char section_identifier; 68 unsigned char version; 69 unsigned short section_length; 70 unsigned char private_key_hash[20]; 71 unsigned char reserved1[4]; 72 unsigned char key_format; 73 unsigned char reserved2; 74 unsigned char key_name_hash[20]; 75 unsigned char key_use_flags[4]; 76 unsigned short p_len; 77 unsigned short q_len; 78 unsigned short dp_len; 79 unsigned short dq_len; 80 unsigned short u_len; 81 unsigned short mod_len; 82 unsigned char reserved3[4]; 83 unsigned short pad_len; 84 unsigned char reserved4[52]; 85 unsigned char confounder[8]; 86 } __packed; 87 88 #define CCA_PVT_EXT_CRT_SEC_ID_PVT 0x08 89 #define CCA_PVT_EXT_CRT_SEC_FMT_CL 0x40 90 91 /** 92 * Set up private key fields of a type6 MEX message. 93 * 94 * @mex: pointer to user input data 95 * @p: pointer to memory area for the key 96 * 97 * Returns the size of the key area or negative errno value. 98 */ zcrypt_type6_mex_key_en(struct ica_rsa_modexpo * mex,void * p)99 static inline int zcrypt_type6_mex_key_en(struct ica_rsa_modexpo *mex, void *p) 100 { 101 static struct cca_token_hdr static_pub_hdr = { 102 .token_identifier = 0x1E, 103 }; 104 static struct cca_public_sec static_pub_sec = { 105 .section_identifier = 0x04, 106 }; 107 struct { 108 struct t6_keyblock_hdr t6_hdr; 109 struct cca_token_hdr pubhdr; 110 struct cca_public_sec pubsec; 111 char exponent[]; 112 } __packed *key = p; 113 unsigned char *ptr; 114 115 /* 116 * The inputdatalength was a selection criteria in the dispatching 117 * function zcrypt_rsa_modexpo(). However, do a plausibility check 118 * here to make sure the following copy_from_user() can't be utilized 119 * to compromise the system. 120 */ 121 if (WARN_ON_ONCE(mex->inputdatalength > 512)) 122 return -EINVAL; 123 124 memset(key, 0, sizeof(*key)); 125 126 key->pubhdr = static_pub_hdr; 127 key->pubsec = static_pub_sec; 128 129 /* key parameter block */ 130 ptr = key->exponent; 131 if (copy_from_user(ptr, mex->b_key, mex->inputdatalength)) 132 return -EFAULT; 133 ptr += mex->inputdatalength; 134 /* modulus */ 135 if (copy_from_user(ptr, mex->n_modulus, mex->inputdatalength)) 136 return -EFAULT; 137 138 key->pubsec.modulus_bit_len = 8 * mex->inputdatalength; 139 key->pubsec.modulus_byte_len = mex->inputdatalength; 140 key->pubsec.exponent_len = mex->inputdatalength; 141 key->pubsec.section_length = sizeof(key->pubsec) + 142 2 * mex->inputdatalength; 143 key->pubhdr.token_length = 144 key->pubsec.section_length + sizeof(key->pubhdr); 145 key->t6_hdr.ulen = key->pubhdr.token_length + 4; 146 key->t6_hdr.blen = key->pubhdr.token_length + 6; 147 148 return sizeof(*key) + 2 * mex->inputdatalength; 149 } 150 151 /** 152 * Set up private key fields of a type6 CRT message. 153 * 154 * @mex: pointer to user input data 155 * @p: pointer to memory area for the key 156 * 157 * Returns the size of the key area or -EFAULT 158 */ zcrypt_type6_crt_key(struct ica_rsa_modexpo_crt * crt,void * p)159 static inline int zcrypt_type6_crt_key(struct ica_rsa_modexpo_crt *crt, void *p) 160 { 161 static struct cca_public_sec static_cca_pub_sec = { 162 .section_identifier = 4, 163 .section_length = 0x000f, 164 .exponent_len = 0x0003, 165 }; 166 static char pk_exponent[3] = { 0x01, 0x00, 0x01 }; 167 struct { 168 struct t6_keyblock_hdr t6_hdr; 169 struct cca_token_hdr token; 170 struct cca_pvt_ext_crt_sec pvt; 171 char key_parts[]; 172 } __packed *key = p; 173 struct cca_public_sec *pub; 174 int short_len, long_len, pad_len, key_len, size; 175 176 /* 177 * The inputdatalength was a selection criteria in the dispatching 178 * function zcrypt_rsa_crt(). However, do a plausibility check 179 * here to make sure the following copy_from_user() can't be utilized 180 * to compromise the system. 181 */ 182 if (WARN_ON_ONCE(crt->inputdatalength > 512)) 183 return -EINVAL; 184 185 memset(key, 0, sizeof(*key)); 186 187 short_len = (crt->inputdatalength + 1) / 2; 188 long_len = short_len + 8; 189 pad_len = -(3 * long_len + 2 * short_len) & 7; 190 key_len = 3 * long_len + 2 * short_len + pad_len + crt->inputdatalength; 191 size = sizeof(*key) + key_len + sizeof(*pub) + 3; 192 193 /* parameter block.key block */ 194 key->t6_hdr.blen = size; 195 key->t6_hdr.ulen = size - 2; 196 197 /* key token header */ 198 key->token.token_identifier = CCA_TKN_HDR_ID_EXT; 199 key->token.token_length = size - 6; 200 201 /* private section */ 202 key->pvt.section_identifier = CCA_PVT_EXT_CRT_SEC_ID_PVT; 203 key->pvt.section_length = sizeof(key->pvt) + key_len; 204 key->pvt.key_format = CCA_PVT_EXT_CRT_SEC_FMT_CL; 205 key->pvt.key_use_flags[0] = CCA_PVT_USAGE_ALL; 206 key->pvt.p_len = key->pvt.dp_len = key->pvt.u_len = long_len; 207 key->pvt.q_len = key->pvt.dq_len = short_len; 208 key->pvt.mod_len = crt->inputdatalength; 209 key->pvt.pad_len = pad_len; 210 211 /* key parts */ 212 if (copy_from_user(key->key_parts, crt->np_prime, long_len) || 213 copy_from_user(key->key_parts + long_len, 214 crt->nq_prime, short_len) || 215 copy_from_user(key->key_parts + long_len + short_len, 216 crt->bp_key, long_len) || 217 copy_from_user(key->key_parts + 2 * long_len + short_len, 218 crt->bq_key, short_len) || 219 copy_from_user(key->key_parts + 2 * long_len + 2 * short_len, 220 crt->u_mult_inv, long_len)) 221 return -EFAULT; 222 memset(key->key_parts + 3 * long_len + 2 * short_len + pad_len, 223 0xff, crt->inputdatalength); 224 pub = (struct cca_public_sec *)(key->key_parts + key_len); 225 *pub = static_cca_pub_sec; 226 pub->modulus_bit_len = 8 * crt->inputdatalength; 227 /* 228 * In a private key, the modulus doesn't appear in the public 229 * section. So, an arbitrary public exponent of 0x010001 will be 230 * used. 231 */ 232 memcpy((char *)(pub + 1), pk_exponent, 3); 233 234 return size; 235 } 236 237 #endif /* _ZCRYPT_CCA_KEY_H_ */ 238