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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright IBM Corp. 2001, 2006
* Author(s): Robert Burroughs
* Eric Rossman (edrossma@us.ibm.com)
*
* Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
* Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
*/
#ifndef _ZCRYPT_CCA_KEY_H_
#define _ZCRYPT_CCA_KEY_H_
struct t6_keyblock_hdr {
unsigned short blen;
unsigned short ulen;
unsigned short flags;
};
/**
* mapping for the cca private ME key token.
* Three parts of interest here: the header, the private section and
* the public section.
*
* mapping for the cca key token header
*/
struct cca_token_hdr {
unsigned char token_identifier;
unsigned char version;
unsigned short token_length;
unsigned char reserved[4];
} __packed;
#define CCA_TKN_HDR_ID_EXT 0x1E
#define CCA_PVT_USAGE_ALL 0x80
/**
* mapping for the cca public section
* In a private key, the modulus doesn't appear in the public
* section. So, an arbitrary public exponent of 0x010001 will be
* used, for a section length of 0x0F always.
*/
struct cca_public_sec {
unsigned char section_identifier;
unsigned char version;
unsigned short section_length;
unsigned char reserved[2];
unsigned short exponent_len;
unsigned short modulus_bit_len;
unsigned short modulus_byte_len; /* In a private key, this is 0 */
} __packed;
/**
* mapping for the cca private CRT key 'token'
* The first three parts (the only parts considered in this release)
* are: the header, the private section and the public section.
* The header and public section are the same as for the
* struct cca_private_ext_ME
*
* Following the structure are the quantities p, q, dp, dq, u, pad,
* and modulus, in that order, where pad_len is the modulo 8
* complement of the residue modulo 8 of the sum of
* (p_len + q_len + dp_len + dq_len + u_len).
*/
struct cca_pvt_ext_crt_sec {
unsigned char section_identifier;
unsigned char version;
unsigned short section_length;
unsigned char private_key_hash[20];
unsigned char reserved1[4];
unsigned char key_format;
unsigned char reserved2;
unsigned char key_name_hash[20];
unsigned char key_use_flags[4];
unsigned short p_len;
unsigned short q_len;
unsigned short dp_len;
unsigned short dq_len;
unsigned short u_len;
unsigned short mod_len;
unsigned char reserved3[4];
unsigned short pad_len;
unsigned char reserved4[52];
unsigned char confounder[8];
} __packed;
#define CCA_PVT_EXT_CRT_SEC_ID_PVT 0x08
#define CCA_PVT_EXT_CRT_SEC_FMT_CL 0x40
/**
* Set up private key fields of a type6 MEX message. The _pad variant
* strips leading zeroes from the b_key.
* Note that all numerics in the key token are big-endian,
* while the entries in the key block header are little-endian.
*
* @mex: pointer to user input data
* @p: pointer to memory area for the key
*
* Returns the size of the key area or negative errno value.
*/
static inline int zcrypt_type6_mex_key_en(struct ica_rsa_modexpo *mex, void *p)
{
static struct cca_token_hdr static_pub_hdr = {
.token_identifier = 0x1E,
};
static struct cca_public_sec static_pub_sec = {
.section_identifier = 0x04,
};
struct {
struct t6_keyblock_hdr t6_hdr;
struct cca_token_hdr pubhdr;
struct cca_public_sec pubsec;
char exponent[0];
} __packed *key = p;
unsigned char *temp;
int i;
/*
* The inputdatalength was a selection criteria in the dispatching
* function zcrypt_rsa_modexpo(). However, do a plausibility check
* here to make sure the following copy_from_user() can't be utilized
* to compromise the system.
*/
if (WARN_ON_ONCE(mex->inputdatalength > 512))
return -EINVAL;
memset(key, 0, sizeof(*key));
key->pubhdr = static_pub_hdr;
key->pubsec = static_pub_sec;
/* key parameter block */
temp = key->exponent;
if (copy_from_user(temp, mex->b_key, mex->inputdatalength))
return -EFAULT;
/* Strip leading zeroes from b_key. */
for (i = 0; i < mex->inputdatalength; i++)
if (temp[i])
break;
if (i >= mex->inputdatalength)
return -EINVAL;
memmove(temp, temp + i, mex->inputdatalength - i);
temp += mex->inputdatalength - i;
/* modulus */
if (copy_from_user(temp, mex->n_modulus, mex->inputdatalength))
return -EFAULT;
key->pubsec.modulus_bit_len = 8 * mex->inputdatalength;
key->pubsec.modulus_byte_len = mex->inputdatalength;
key->pubsec.exponent_len = mex->inputdatalength - i;
key->pubsec.section_length = sizeof(key->pubsec) +
2 * mex->inputdatalength - i;
key->pubhdr.token_length =
key->pubsec.section_length + sizeof(key->pubhdr);
key->t6_hdr.ulen = key->pubhdr.token_length + 4;
key->t6_hdr.blen = key->pubhdr.token_length + 6;
return sizeof(*key) + 2 * mex->inputdatalength - i;
}
/**
* Set up private key fields of a type6 CRT message.
* Note that all numerics in the key token are big-endian,
* while the entries in the key block header are little-endian.
*
* @mex: pointer to user input data
* @p: pointer to memory area for the key
*
* Returns the size of the key area or -EFAULT
*/
static inline int zcrypt_type6_crt_key(struct ica_rsa_modexpo_crt *crt, void *p)
{
static struct cca_public_sec static_cca_pub_sec = {
.section_identifier = 4,
.section_length = 0x000f,
.exponent_len = 0x0003,
};
static char pk_exponent[3] = { 0x01, 0x00, 0x01 };
struct {
struct t6_keyblock_hdr t6_hdr;
struct cca_token_hdr token;
struct cca_pvt_ext_crt_sec pvt;
char key_parts[0];
} __packed *key = p;
struct cca_public_sec *pub;
int short_len, long_len, pad_len, key_len, size;
/*
* The inputdatalength was a selection criteria in the dispatching
* function zcrypt_rsa_crt(). However, do a plausibility check
* here to make sure the following copy_from_user() can't be utilized
* to compromise the system.
*/
if (WARN_ON_ONCE(crt->inputdatalength > 512))
return -EINVAL;
memset(key, 0, sizeof(*key));
short_len = (crt->inputdatalength + 1) / 2;
long_len = short_len + 8;
pad_len = -(3 * long_len + 2 * short_len) & 7;
key_len = 3 * long_len + 2 * short_len + pad_len + crt->inputdatalength;
size = sizeof(*key) + key_len + sizeof(*pub) + 3;
/* parameter block.key block */
key->t6_hdr.blen = size;
key->t6_hdr.ulen = size - 2;
/* key token header */
key->token.token_identifier = CCA_TKN_HDR_ID_EXT;
key->token.token_length = size - 6;
/* private section */
key->pvt.section_identifier = CCA_PVT_EXT_CRT_SEC_ID_PVT;
key->pvt.section_length = sizeof(key->pvt) + key_len;
key->pvt.key_format = CCA_PVT_EXT_CRT_SEC_FMT_CL;
key->pvt.key_use_flags[0] = CCA_PVT_USAGE_ALL;
key->pvt.p_len = key->pvt.dp_len = key->pvt.u_len = long_len;
key->pvt.q_len = key->pvt.dq_len = short_len;
key->pvt.mod_len = crt->inputdatalength;
key->pvt.pad_len = pad_len;
/* key parts */
if (copy_from_user(key->key_parts, crt->np_prime, long_len) ||
copy_from_user(key->key_parts + long_len,
crt->nq_prime, short_len) ||
copy_from_user(key->key_parts + long_len + short_len,
crt->bp_key, long_len) ||
copy_from_user(key->key_parts + 2 * long_len + short_len,
crt->bq_key, short_len) ||
copy_from_user(key->key_parts + 2 * long_len + 2 * short_len,
crt->u_mult_inv, long_len))
return -EFAULT;
memset(key->key_parts + 3 * long_len + 2 * short_len + pad_len,
0xff, crt->inputdatalength);
pub = (struct cca_public_sec *)(key->key_parts + key_len);
*pub = static_cca_pub_sec;
pub->modulus_bit_len = 8 * crt->inputdatalength;
/*
* In a private key, the modulus doesn't appear in the public
* section. So, an arbitrary public exponent of 0x010001 will be
* used.
*/
memcpy((char *)(pub + 1), pk_exponent, 3);
return size;
}
#endif /* _ZCRYPT_CCA_KEY_H_ */
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