1812141a9SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0+ 26684af1aSMartin Schwidefsky /* 35432114bSRalph Wuerthner * zcrypt 2.1.0 46684af1aSMartin Schwidefsky * 5a53c8fabSHeiko Carstens * Copyright IBM Corp. 2001, 2006 66684af1aSMartin Schwidefsky * Author(s): Robert Burroughs 76684af1aSMartin Schwidefsky * Eric Rossman (edrossma@us.ibm.com) 86684af1aSMartin Schwidefsky * 96684af1aSMartin Schwidefsky * Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com) 106684af1aSMartin Schwidefsky * Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com> 116684af1aSMartin Schwidefsky */ 126684af1aSMartin Schwidefsky 136684af1aSMartin Schwidefsky #ifndef _ZCRYPT_CCA_KEY_H_ 146684af1aSMartin Schwidefsky #define _ZCRYPT_CCA_KEY_H_ 156684af1aSMartin Schwidefsky 166684af1aSMartin Schwidefsky struct T6_keyBlock_hdr { 176684af1aSMartin Schwidefsky unsigned short blen; 186684af1aSMartin Schwidefsky unsigned short ulen; 196684af1aSMartin Schwidefsky unsigned short flags; 206684af1aSMartin Schwidefsky }; 216684af1aSMartin Schwidefsky 226684af1aSMartin Schwidefsky /** 236684af1aSMartin Schwidefsky * mapping for the cca private ME key token. 246684af1aSMartin Schwidefsky * Three parts of interest here: the header, the private section and 256684af1aSMartin Schwidefsky * the public section. 266684af1aSMartin Schwidefsky * 276684af1aSMartin Schwidefsky * mapping for the cca key token header 286684af1aSMartin Schwidefsky */ 296684af1aSMartin Schwidefsky struct cca_token_hdr { 306684af1aSMartin Schwidefsky unsigned char token_identifier; 316684af1aSMartin Schwidefsky unsigned char version; 326684af1aSMartin Schwidefsky unsigned short token_length; 336684af1aSMartin Schwidefsky unsigned char reserved[4]; 346684af1aSMartin Schwidefsky } __attribute__((packed)); 356684af1aSMartin Schwidefsky 366684af1aSMartin Schwidefsky #define CCA_TKN_HDR_ID_EXT 0x1E 376684af1aSMartin Schwidefsky 386684af1aSMartin Schwidefsky #define CCA_PVT_USAGE_ALL 0x80 396684af1aSMartin Schwidefsky 406684af1aSMartin Schwidefsky /** 416684af1aSMartin Schwidefsky * mapping for the cca public section 426684af1aSMartin Schwidefsky * In a private key, the modulus doesn't appear in the public 436684af1aSMartin Schwidefsky * section. So, an arbitrary public exponent of 0x010001 will be 446684af1aSMartin Schwidefsky * used, for a section length of 0x0F always. 456684af1aSMartin Schwidefsky */ 466684af1aSMartin Schwidefsky struct cca_public_sec { 476684af1aSMartin Schwidefsky unsigned char section_identifier; 486684af1aSMartin Schwidefsky unsigned char version; 496684af1aSMartin Schwidefsky unsigned short section_length; 506684af1aSMartin Schwidefsky unsigned char reserved[2]; 516684af1aSMartin Schwidefsky unsigned short exponent_len; 526684af1aSMartin Schwidefsky unsigned short modulus_bit_len; 536684af1aSMartin Schwidefsky unsigned short modulus_byte_len; /* In a private key, this is 0 */ 546684af1aSMartin Schwidefsky } __attribute__((packed)); 556684af1aSMartin Schwidefsky 566684af1aSMartin Schwidefsky /** 576684af1aSMartin Schwidefsky * mapping for the cca private CRT key 'token' 586684af1aSMartin Schwidefsky * The first three parts (the only parts considered in this release) 596684af1aSMartin Schwidefsky * are: the header, the private section and the public section. 606684af1aSMartin Schwidefsky * The header and public section are the same as for the 616684af1aSMartin Schwidefsky * struct cca_private_ext_ME 626684af1aSMartin Schwidefsky * 636684af1aSMartin Schwidefsky * Following the structure are the quantities p, q, dp, dq, u, pad, 646684af1aSMartin Schwidefsky * and modulus, in that order, where pad_len is the modulo 8 656684af1aSMartin Schwidefsky * complement of the residue modulo 8 of the sum of 666684af1aSMartin Schwidefsky * (p_len + q_len + dp_len + dq_len + u_len). 676684af1aSMartin Schwidefsky */ 686684af1aSMartin Schwidefsky struct cca_pvt_ext_CRT_sec { 696684af1aSMartin Schwidefsky unsigned char section_identifier; 706684af1aSMartin Schwidefsky unsigned char version; 716684af1aSMartin Schwidefsky unsigned short section_length; 726684af1aSMartin Schwidefsky unsigned char private_key_hash[20]; 736684af1aSMartin Schwidefsky unsigned char reserved1[4]; 746684af1aSMartin Schwidefsky unsigned char key_format; 756684af1aSMartin Schwidefsky unsigned char reserved2; 766684af1aSMartin Schwidefsky unsigned char key_name_hash[20]; 776684af1aSMartin Schwidefsky unsigned char key_use_flags[4]; 786684af1aSMartin Schwidefsky unsigned short p_len; 796684af1aSMartin Schwidefsky unsigned short q_len; 806684af1aSMartin Schwidefsky unsigned short dp_len; 816684af1aSMartin Schwidefsky unsigned short dq_len; 826684af1aSMartin Schwidefsky unsigned short u_len; 836684af1aSMartin Schwidefsky unsigned short mod_len; 846684af1aSMartin Schwidefsky unsigned char reserved3[4]; 856684af1aSMartin Schwidefsky unsigned short pad_len; 866684af1aSMartin Schwidefsky unsigned char reserved4[52]; 876684af1aSMartin Schwidefsky unsigned char confounder[8]; 886684af1aSMartin Schwidefsky } __attribute__((packed)); 896684af1aSMartin Schwidefsky 906684af1aSMartin Schwidefsky #define CCA_PVT_EXT_CRT_SEC_ID_PVT 0x08 916684af1aSMartin Schwidefsky #define CCA_PVT_EXT_CRT_SEC_FMT_CL 0x40 926684af1aSMartin Schwidefsky 936684af1aSMartin Schwidefsky /** 946684af1aSMartin Schwidefsky * Set up private key fields of a type6 MEX message. The _pad variant 956684af1aSMartin Schwidefsky * strips leading zeroes from the b_key. 966684af1aSMartin Schwidefsky * Note that all numerics in the key token are big-endian, 976684af1aSMartin Schwidefsky * while the entries in the key block header are little-endian. 986684af1aSMartin Schwidefsky * 996684af1aSMartin Schwidefsky * @mex: pointer to user input data 1006684af1aSMartin Schwidefsky * @p: pointer to memory area for the key 1016684af1aSMartin Schwidefsky * 1021fee9626SHarald Freudenberger * Returns the size of the key area or negative errno value. 1036684af1aSMartin Schwidefsky */ 1048ff34588SHeiko Carstens static inline int zcrypt_type6_mex_key_en(struct ica_rsa_modexpo *mex, void *p) 1056684af1aSMartin Schwidefsky { 1066684af1aSMartin Schwidefsky static struct cca_token_hdr static_pub_hdr = { 1076684af1aSMartin Schwidefsky .token_identifier = 0x1E, 1086684af1aSMartin Schwidefsky }; 1096684af1aSMartin Schwidefsky static struct cca_public_sec static_pub_sec = { 1106684af1aSMartin Schwidefsky .section_identifier = 0x04, 1116684af1aSMartin Schwidefsky }; 1126684af1aSMartin Schwidefsky struct { 1136684af1aSMartin Schwidefsky struct T6_keyBlock_hdr t6_hdr; 1146684af1aSMartin Schwidefsky struct cca_token_hdr pubHdr; 1156684af1aSMartin Schwidefsky struct cca_public_sec pubSec; 1166684af1aSMartin Schwidefsky char exponent[0]; 1176684af1aSMartin Schwidefsky } __attribute__((packed)) *key = p; 1186684af1aSMartin Schwidefsky unsigned char *temp; 1196684af1aSMartin Schwidefsky int i; 1206684af1aSMartin Schwidefsky 1211fee9626SHarald Freudenberger /* 1221fee9626SHarald Freudenberger * The inputdatalength was a selection criteria in the dispatching 1231fee9626SHarald Freudenberger * function zcrypt_rsa_modexpo(). However, do a plausibility check 1241fee9626SHarald Freudenberger * here to make sure the following copy_from_user() can't be utilized 1251fee9626SHarald Freudenberger * to compromise the system. 1261fee9626SHarald Freudenberger */ 1271fee9626SHarald Freudenberger if (WARN_ON_ONCE(mex->inputdatalength > 512)) 1281fee9626SHarald Freudenberger return -EINVAL; 1291fee9626SHarald Freudenberger 1306684af1aSMartin Schwidefsky memset(key, 0, sizeof(*key)); 1316684af1aSMartin Schwidefsky 1326684af1aSMartin Schwidefsky key->pubHdr = static_pub_hdr; 1336684af1aSMartin Schwidefsky key->pubSec = static_pub_sec; 1346684af1aSMartin Schwidefsky 1356684af1aSMartin Schwidefsky /* key parameter block */ 1366684af1aSMartin Schwidefsky temp = key->exponent; 1376684af1aSMartin Schwidefsky if (copy_from_user(temp, mex->b_key, mex->inputdatalength)) 1386684af1aSMartin Schwidefsky return -EFAULT; 1396684af1aSMartin Schwidefsky /* Strip leading zeroes from b_key. */ 1406684af1aSMartin Schwidefsky for (i = 0; i < mex->inputdatalength; i++) 1416684af1aSMartin Schwidefsky if (temp[i]) 1426684af1aSMartin Schwidefsky break; 1436684af1aSMartin Schwidefsky if (i >= mex->inputdatalength) 1446684af1aSMartin Schwidefsky return -EINVAL; 1456684af1aSMartin Schwidefsky memmove(temp, temp + i, mex->inputdatalength - i); 1466684af1aSMartin Schwidefsky temp += mex->inputdatalength - i; 1476684af1aSMartin Schwidefsky /* modulus */ 1486684af1aSMartin Schwidefsky if (copy_from_user(temp, mex->n_modulus, mex->inputdatalength)) 1496684af1aSMartin Schwidefsky return -EFAULT; 1506684af1aSMartin Schwidefsky 1516684af1aSMartin Schwidefsky key->pubSec.modulus_bit_len = 8 * mex->inputdatalength; 1526684af1aSMartin Schwidefsky key->pubSec.modulus_byte_len = mex->inputdatalength; 1536684af1aSMartin Schwidefsky key->pubSec.exponent_len = mex->inputdatalength - i; 1546684af1aSMartin Schwidefsky key->pubSec.section_length = sizeof(key->pubSec) + 1556684af1aSMartin Schwidefsky 2*mex->inputdatalength - i; 1566684af1aSMartin Schwidefsky key->pubHdr.token_length = 1576684af1aSMartin Schwidefsky key->pubSec.section_length + sizeof(key->pubHdr); 1588ff34588SHeiko Carstens key->t6_hdr.ulen = key->pubHdr.token_length + 4; 1598ff34588SHeiko Carstens key->t6_hdr.blen = key->pubHdr.token_length + 6; 1606684af1aSMartin Schwidefsky return sizeof(*key) + 2*mex->inputdatalength - i; 1616684af1aSMartin Schwidefsky } 1626684af1aSMartin Schwidefsky 1636684af1aSMartin Schwidefsky /** 1646684af1aSMartin Schwidefsky * Set up private key fields of a type6 CRT message. 1656684af1aSMartin Schwidefsky * Note that all numerics in the key token are big-endian, 1666684af1aSMartin Schwidefsky * while the entries in the key block header are little-endian. 1676684af1aSMartin Schwidefsky * 1686684af1aSMartin Schwidefsky * @mex: pointer to user input data 1696684af1aSMartin Schwidefsky * @p: pointer to memory area for the key 1706684af1aSMartin Schwidefsky * 1716684af1aSMartin Schwidefsky * Returns the size of the key area or -EFAULT 1726684af1aSMartin Schwidefsky */ 1738ff34588SHeiko Carstens static inline int zcrypt_type6_crt_key(struct ica_rsa_modexpo_crt *crt, void *p) 1746684af1aSMartin Schwidefsky { 1756684af1aSMartin Schwidefsky static struct cca_public_sec static_cca_pub_sec = { 1766684af1aSMartin Schwidefsky .section_identifier = 4, 1776684af1aSMartin Schwidefsky .section_length = 0x000f, 1786684af1aSMartin Schwidefsky .exponent_len = 0x0003, 1796684af1aSMartin Schwidefsky }; 1806684af1aSMartin Schwidefsky static char pk_exponent[3] = { 0x01, 0x00, 0x01 }; 1816684af1aSMartin Schwidefsky struct { 1826684af1aSMartin Schwidefsky struct T6_keyBlock_hdr t6_hdr; 1836684af1aSMartin Schwidefsky struct cca_token_hdr token; 1846684af1aSMartin Schwidefsky struct cca_pvt_ext_CRT_sec pvt; 1856684af1aSMartin Schwidefsky char key_parts[0]; 1866684af1aSMartin Schwidefsky } __attribute__((packed)) *key = p; 1876684af1aSMartin Schwidefsky struct cca_public_sec *pub; 1886684af1aSMartin Schwidefsky int short_len, long_len, pad_len, key_len, size; 1896684af1aSMartin Schwidefsky 1901fee9626SHarald Freudenberger /* 1911fee9626SHarald Freudenberger * The inputdatalength was a selection criteria in the dispatching 1921fee9626SHarald Freudenberger * function zcrypt_rsa_crt(). However, do a plausibility check 1931fee9626SHarald Freudenberger * here to make sure the following copy_from_user() can't be utilized 1941fee9626SHarald Freudenberger * to compromise the system. 1951fee9626SHarald Freudenberger */ 1961fee9626SHarald Freudenberger if (WARN_ON_ONCE(crt->inputdatalength > 512)) 1971fee9626SHarald Freudenberger return -EINVAL; 1981fee9626SHarald Freudenberger 1996684af1aSMartin Schwidefsky memset(key, 0, sizeof(*key)); 2006684af1aSMartin Schwidefsky 2011330a125SIngo Tuchscherer short_len = (crt->inputdatalength + 1) / 2; 2026684af1aSMartin Schwidefsky long_len = short_len + 8; 2036684af1aSMartin Schwidefsky pad_len = -(3*long_len + 2*short_len) & 7; 2046684af1aSMartin Schwidefsky key_len = 3*long_len + 2*short_len + pad_len + crt->inputdatalength; 2056684af1aSMartin Schwidefsky size = sizeof(*key) + key_len + sizeof(*pub) + 3; 2066684af1aSMartin Schwidefsky 2076684af1aSMartin Schwidefsky /* parameter block.key block */ 2088ff34588SHeiko Carstens key->t6_hdr.blen = size; 2098ff34588SHeiko Carstens key->t6_hdr.ulen = size - 2; 2106684af1aSMartin Schwidefsky 2116684af1aSMartin Schwidefsky /* key token header */ 2126684af1aSMartin Schwidefsky key->token.token_identifier = CCA_TKN_HDR_ID_EXT; 2136684af1aSMartin Schwidefsky key->token.token_length = size - 6; 2146684af1aSMartin Schwidefsky 2156684af1aSMartin Schwidefsky /* private section */ 2166684af1aSMartin Schwidefsky key->pvt.section_identifier = CCA_PVT_EXT_CRT_SEC_ID_PVT; 2176684af1aSMartin Schwidefsky key->pvt.section_length = sizeof(key->pvt) + key_len; 2186684af1aSMartin Schwidefsky key->pvt.key_format = CCA_PVT_EXT_CRT_SEC_FMT_CL; 2196684af1aSMartin Schwidefsky key->pvt.key_use_flags[0] = CCA_PVT_USAGE_ALL; 2206684af1aSMartin Schwidefsky key->pvt.p_len = key->pvt.dp_len = key->pvt.u_len = long_len; 2216684af1aSMartin Schwidefsky key->pvt.q_len = key->pvt.dq_len = short_len; 2226684af1aSMartin Schwidefsky key->pvt.mod_len = crt->inputdatalength; 2236684af1aSMartin Schwidefsky key->pvt.pad_len = pad_len; 2246684af1aSMartin Schwidefsky 2256684af1aSMartin Schwidefsky /* key parts */ 2266684af1aSMartin Schwidefsky if (copy_from_user(key->key_parts, crt->np_prime, long_len) || 2276684af1aSMartin Schwidefsky copy_from_user(key->key_parts + long_len, 2286684af1aSMartin Schwidefsky crt->nq_prime, short_len) || 2296684af1aSMartin Schwidefsky copy_from_user(key->key_parts + long_len + short_len, 2306684af1aSMartin Schwidefsky crt->bp_key, long_len) || 2316684af1aSMartin Schwidefsky copy_from_user(key->key_parts + 2*long_len + short_len, 2326684af1aSMartin Schwidefsky crt->bq_key, short_len) || 2336684af1aSMartin Schwidefsky copy_from_user(key->key_parts + 2*long_len + 2*short_len, 2346684af1aSMartin Schwidefsky crt->u_mult_inv, long_len)) 2356684af1aSMartin Schwidefsky return -EFAULT; 2366684af1aSMartin Schwidefsky memset(key->key_parts + 3*long_len + 2*short_len + pad_len, 2376684af1aSMartin Schwidefsky 0xff, crt->inputdatalength); 2386684af1aSMartin Schwidefsky pub = (struct cca_public_sec *)(key->key_parts + key_len); 2396684af1aSMartin Schwidefsky *pub = static_cca_pub_sec; 2406684af1aSMartin Schwidefsky pub->modulus_bit_len = 8 * crt->inputdatalength; 2411749a81dSFelix Beck /* 2426684af1aSMartin Schwidefsky * In a private key, the modulus doesn't appear in the public 2436684af1aSMartin Schwidefsky * section. So, an arbitrary public exponent of 0x010001 will be 2446684af1aSMartin Schwidefsky * used. 2456684af1aSMartin Schwidefsky */ 2466684af1aSMartin Schwidefsky memcpy((char *) (pub + 1), pk_exponent, 3); 2476684af1aSMartin Schwidefsky return size; 2486684af1aSMartin Schwidefsky } 2496684af1aSMartin Schwidefsky 2506684af1aSMartin Schwidefsky #endif /* _ZCRYPT_CCA_KEY_H_ */ 251