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s390/zcrypt: Introduce new SHA-512 based Pseudo Random Generator. 

Rework of the prandom device with introduction of a new SHA-512 based
NIST SP 800-90 conform deterministic random bit generator.

Signed-off-by: Harald Freudenberger <freude@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Harald Freudenberger 2015-03-16 14:52:52 +01:00 committed by Martin Schwidefsky
parent a1c843b825
commit 57127645d7
2 changed files with 874 additions and 106 deletions
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122
arch/s390/crypto/crypt_s390.h
View File

@ -3,9 +3,10 @@
* *
* Support for s390 cryptographic instructions. * Support for s390 cryptographic instructions.
* *
* Copyright IBM Corp. 2003, 2007 * Copyright IBM Corp. 2003, 2015
* Author(s): Thomas Spatzier * Author(s): Thomas Spatzier
* Jan Glauber (jan.glauber@de.ibm.com) * Jan Glauber (jan.glauber@de.ibm.com)
* Harald Freudenberger (freude@de.ibm.com)
* *
* This program is free software; you can redistribute it and/or modify it * This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free * under the terms of the GNU General Public License as published by the Free
@ -28,15 +29,17 @@
#define CRYPT_S390_MSA 0x1 #define CRYPT_S390_MSA 0x1
#define CRYPT_S390_MSA3 0x2 #define CRYPT_S390_MSA3 0x2
#define CRYPT_S390_MSA4 0x4 #define CRYPT_S390_MSA4 0x4
#define CRYPT_S390_MSA5 0x8
/* s390 cryptographic operations */ /* s390 cryptographic operations */
enum crypt_s390_operations { enum crypt_s390_operations {
CRYPT_S390_KM = 0x0100, CRYPT_S390_KM = 0x0100,
CRYPT_S390_KMC = 0x0200, CRYPT_S390_KMC = 0x0200,
CRYPT_S390_KIMD = 0x0300, CRYPT_S390_KIMD = 0x0300,
CRYPT_S390_KLMD = 0x0400, CRYPT_S390_KLMD = 0x0400,
CRYPT_S390_KMAC = 0x0500, CRYPT_S390_KMAC = 0x0500,
CRYPT_S390_KMCTR = 0x0600 CRYPT_S390_KMCTR = 0x0600,
CRYPT_S390_PPNO = 0x0700
}; };
/* /*
@ -138,6 +141,16 @@ enum crypt_s390_kmac_func {
KMAC_TDEA_192 = CRYPT_S390_KMAC | 3 KMAC_TDEA_192 = CRYPT_S390_KMAC | 3
}; };
/*
* function codes for PPNO (PERFORM PSEUDORANDOM NUMBER
* OPERATION) instruction
*/
enum crypt_s390_ppno_func {
PPNO_QUERY = CRYPT_S390_PPNO | 0,
PPNO_SHA512_DRNG_GEN = CRYPT_S390_PPNO | 3,
PPNO_SHA512_DRNG_SEED = CRYPT_S390_PPNO | 0x83
};
/** /**
* crypt_s390_km: * crypt_s390_km:
* @func: the function code passed to KM; see crypt_s390_km_func * @func: the function code passed to KM; see crypt_s390_km_func
@ -162,11 +175,11 @@ static inline int crypt_s390_km(long func, void *param,
int ret; int ret;
asm volatile( asm volatile(
"0: .insn rre,0xb92e0000,%3,%1 \n" /* KM opcode */ "0: .insn rre,0xb92e0000,%3,%1\n" /* KM opcode */
"1: brc 1,0b \n" /* handle partial completion */ "1: brc 1,0b\n" /* handle partial completion */
" la %0,0\n" " la %0,0\n"
"2:\n" "2:\n"
EX_TABLE(0b,2b) EX_TABLE(1b,2b) EX_TABLE(0b, 2b) EX_TABLE(1b, 2b)
: "=d" (ret), "+a" (__src), "+d" (__src_len), "+a" (__dest) : "=d" (ret), "+a" (__src), "+d" (__src_len), "+a" (__dest)
: "d" (__func), "a" (__param), "0" (-1) : "cc", "memory"); : "d" (__func), "a" (__param), "0" (-1) : "cc", "memory");
if (ret < 0) if (ret < 0)
@ -198,11 +211,11 @@ static inline int crypt_s390_kmc(long func, void *param,
int ret; int ret;
asm volatile( asm volatile(
"0: .insn rre,0xb92f0000,%3,%1 \n" /* KMC opcode */ "0: .insn rre,0xb92f0000,%3,%1\n" /* KMC opcode */
"1: brc 1,0b \n" /* handle partial completion */ "1: brc 1,0b\n" /* handle partial completion */
" la %0,0\n" " la %0,0\n"
"2:\n" "2:\n"
EX_TABLE(0b,2b) EX_TABLE(1b,2b) EX_TABLE(0b, 2b) EX_TABLE(1b, 2b)
: "=d" (ret), "+a" (__src), "+d" (__src_len), "+a" (__dest) : "=d" (ret), "+a" (__src), "+d" (__src_len), "+a" (__dest)
: "d" (__func), "a" (__param), "0" (-1) : "cc", "memory"); : "d" (__func), "a" (__param), "0" (-1) : "cc", "memory");
if (ret < 0) if (ret < 0)
@ -233,11 +246,11 @@ static inline int crypt_s390_kimd(long func, void *param,
int ret; int ret;
asm volatile( asm volatile(
"0: .insn rre,0xb93e0000,%1,%1 \n" /* KIMD opcode */ "0: .insn rre,0xb93e0000,%1,%1\n" /* KIMD opcode */
"1: brc 1,0b \n" /* handle partial completion */ "1: brc 1,0b\n" /* handle partial completion */
" la %0,0\n" " la %0,0\n"
"2:\n" "2:\n"
EX_TABLE(0b,2b) EX_TABLE(1b,2b) EX_TABLE(0b, 2b) EX_TABLE(1b, 2b)
: "=d" (ret), "+a" (__src), "+d" (__src_len) : "=d" (ret), "+a" (__src), "+d" (__src_len)
: "d" (__func), "a" (__param), "0" (-1) : "cc", "memory"); : "d" (__func), "a" (__param), "0" (-1) : "cc", "memory");
if (ret < 0) if (ret < 0)
@ -267,11 +280,11 @@ static inline int crypt_s390_klmd(long func, void *param,
int ret; int ret;
asm volatile( asm volatile(
"0: .insn rre,0xb93f0000,%1,%1 \n" /* KLMD opcode */ "0: .insn rre,0xb93f0000,%1,%1\n" /* KLMD opcode */
"1: brc 1,0b \n" /* handle partial completion */ "1: brc 1,0b\n" /* handle partial completion */
" la %0,0\n" " la %0,0\n"
"2:\n" "2:\n"
EX_TABLE(0b,2b) EX_TABLE(1b,2b) EX_TABLE(0b, 2b) EX_TABLE(1b, 2b)
: "=d" (ret), "+a" (__src), "+d" (__src_len) : "=d" (ret), "+a" (__src), "+d" (__src_len)
: "d" (__func), "a" (__param), "0" (-1) : "cc", "memory"); : "d" (__func), "a" (__param), "0" (-1) : "cc", "memory");
if (ret < 0) if (ret < 0)
@ -302,11 +315,11 @@ static inline int crypt_s390_kmac(long func, void *param,
int ret; int ret;
asm volatile( asm volatile(
"0: .insn rre,0xb91e0000,%1,%1 \n" /* KLAC opcode */ "0: .insn rre,0xb91e0000,%1,%1\n" /* KLAC opcode */
"1: brc 1,0b \n" /* handle partial completion */ "1: brc 1,0b\n" /* handle partial completion */
" la %0,0\n" " la %0,0\n"
"2:\n" "2:\n"
EX_TABLE(0b,2b) EX_TABLE(1b,2b) EX_TABLE(0b, 2b) EX_TABLE(1b, 2b)
: "=d" (ret), "+a" (__src), "+d" (__src_len) : "=d" (ret), "+a" (__src), "+d" (__src_len)
: "d" (__func), "a" (__param), "0" (-1) : "cc", "memory"); : "d" (__func), "a" (__param), "0" (-1) : "cc", "memory");
if (ret < 0) if (ret < 0)
@ -340,11 +353,11 @@ static inline int crypt_s390_kmctr(long func, void *param, u8 *dest,
int ret = -1; int ret = -1;
asm volatile( asm volatile(
"0: .insn rrf,0xb92d0000,%3,%1,%4,0 \n" /* KMCTR opcode */ "0: .insn rrf,0xb92d0000,%3,%1,%4,0\n" /* KMCTR opcode */
"1: brc 1,0b \n" /* handle partial completion */ "1: brc 1,0b\n" /* handle partial completion */
" la %0,0\n" " la %0,0\n"
"2:\n" "2:\n"
EX_TABLE(0b,2b) EX_TABLE(1b,2b) EX_TABLE(0b, 2b) EX_TABLE(1b, 2b)
: "+d" (ret), "+a" (__src), "+d" (__src_len), "+a" (__dest), : "+d" (ret), "+a" (__src), "+d" (__src_len), "+a" (__dest),
"+a" (__ctr) "+a" (__ctr)
: "d" (__func), "a" (__param) : "cc", "memory"); : "d" (__func), "a" (__param) : "cc", "memory");
@ -353,6 +366,47 @@ static inline int crypt_s390_kmctr(long func, void *param, u8 *dest,
return (func & CRYPT_S390_FUNC_MASK) ? src_len - __src_len : __src_len; return (func & CRYPT_S390_FUNC_MASK) ? src_len - __src_len : __src_len;
} }
/**
* crypt_s390_ppno:
* @func: the function code passed to PPNO; see crypt_s390_ppno_func
* @param: address of parameter block; see POP for details on each func
* @dest: address of destination memory area
* @dest_len: size of destination memory area in bytes
* @seed: address of seed data
* @seed_len: size of seed data in bytes
*
* Executes the PPNO (PERFORM PSEUDORANDOM NUMBER OPERATION)
* operation of the CPU.
*
* Returns -1 for failure, 0 for the query func, number of random
* bytes stored in dest buffer for generate function
*/
static inline int crypt_s390_ppno(long func, void *param,
u8 *dest, long dest_len,
const u8 *seed, long seed_len)
{
register long __func asm("0") = func & CRYPT_S390_FUNC_MASK;
register void *__param asm("1") = param; /* param block (240 bytes) */
register u8 *__dest asm("2") = dest; /* buf for recv random bytes */
register long __dest_len asm("3") = dest_len; /* requested random bytes */
register const u8 *__seed asm("4") = seed; /* buf with seed data */
register long __seed_len asm("5") = seed_len; /* bytes in seed buf */
int ret = -1;
asm volatile (
"0: .insn rre,0xb93c0000,%1,%5\n" /* PPNO opcode */
"1: brc 1,0b\n" /* handle partial completion */
" la %0,0\n"
"2:\n"
EX_TABLE(0b, 2b) EX_TABLE(1b, 2b)
: "+d" (ret), "+a"(__dest), "+d"(__dest_len)
: "d"(__func), "a"(__param), "a"(__seed), "d"(__seed_len)
: "cc", "memory");
if (ret < 0)
return ret;
return (func & CRYPT_S390_FUNC_MASK) ? dest_len - __dest_len : 0;
}
/** /**
* crypt_s390_func_available: * crypt_s390_func_available:
* @func: the function code of the specific function; 0 if op in general * @func: the function code of the specific function; 0 if op in general
@ -373,6 +427,9 @@ static inline int crypt_s390_func_available(int func,
return 0; return 0;
if (facility_mask & CRYPT_S390_MSA4 && !test_facility(77)) if (facility_mask & CRYPT_S390_MSA4 && !test_facility(77))
return 0; return 0;
if (facility_mask & CRYPT_S390_MSA5 && !test_facility(57))
return 0;
switch (func & CRYPT_S390_OP_MASK) { switch (func & CRYPT_S390_OP_MASK) {
case CRYPT_S390_KM: case CRYPT_S390_KM:
ret = crypt_s390_km(KM_QUERY, &status, NULL, NULL, 0); ret = crypt_s390_km(KM_QUERY, &status, NULL, NULL, 0);
@ -390,8 +447,12 @@ static inline int crypt_s390_func_available(int func,
ret = crypt_s390_kmac(KMAC_QUERY, &status, NULL, 0); ret = crypt_s390_kmac(KMAC_QUERY, &status, NULL, 0);
break; break;
case CRYPT_S390_KMCTR: case CRYPT_S390_KMCTR:
ret = crypt_s390_kmctr(KMCTR_QUERY, &status, NULL, NULL, 0, ret = crypt_s390_kmctr(KMCTR_QUERY, &status,
NULL); NULL, NULL, 0, NULL);
break;
case CRYPT_S390_PPNO:
ret = crypt_s390_ppno(PPNO_QUERY, &status,
NULL, 0, NULL, 0);
break; break;
default: default:
return 0; return 0;
@ -419,15 +480,14 @@ static inline int crypt_s390_pcc(long func, void *param)
int ret = -1; int ret = -1;
asm volatile( asm volatile(
"0: .insn rre,0xb92c0000,0,0 \n" /* PCC opcode */ "0: .insn rre,0xb92c0000,0,0\n" /* PCC opcode */
"1: brc 1,0b \n" /* handle partial completion */ "1: brc 1,0b\n" /* handle partial completion */
" la %0,0\n" " la %0,0\n"
"2:\n" "2:\n"
EX_TABLE(0b,2b) EX_TABLE(1b,2b) EX_TABLE(0b, 2b) EX_TABLE(1b, 2b)
: "+d" (ret) : "+d" (ret)
: "d" (__func), "a" (__param) : "cc", "memory"); : "d" (__func), "a" (__param) : "cc", "memory");
return ret; return ret;
} }
#endif /* _CRYPTO_ARCH_S390_CRYPT_S390_H */ #endif /* _CRYPTO_ARCH_S390_CRYPT_S390_H */

858
arch/s390/crypto/prng.c
View File

@ -1,106 +1,529 @@
/* /*
* Copyright IBM Corp. 2006, 2007 * Copyright IBM Corp. 2006, 2015
* Author(s): Jan Glauber <jan.glauber@de.ibm.com> * Author(s): Jan Glauber <jan.glauber@de.ibm.com>
* Harald Freudenberger <freude@de.ibm.com>
* Driver for the s390 pseudo random number generator * Driver for the s390 pseudo random number generator
*/ */
#define KMSG_COMPONENT "prng"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/fs.h> #include <linux/fs.h>
#include <linux/fips.h>
#include <linux/init.h> #include <linux/init.h>
#include <linux/kernel.h> #include <linux/kernel.h>
#include <linux/device.h>
#include <linux/miscdevice.h> #include <linux/miscdevice.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/moduleparam.h> #include <linux/moduleparam.h>
#include <linux/mutex.h>
#include <linux/random.h> #include <linux/random.h>
#include <linux/slab.h> #include <linux/slab.h>
#include <asm/debug.h> #include <asm/debug.h>
#include <asm/uaccess.h> #include <asm/uaccess.h>
#include <asm/timex.h>
#include "crypt_s390.h" #include "crypt_s390.h"
MODULE_LICENSE("GPL"); MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jan Glauber <jan.glauber@de.ibm.com>"); MODULE_AUTHOR("IBM Corporation");
MODULE_DESCRIPTION("s390 PRNG interface"); MODULE_DESCRIPTION("s390 PRNG interface");
static int prng_chunk_size = 256;
module_param(prng_chunk_size, int, S_IRUSR | S_IRGRP | S_IROTH); #define PRNG_MODE_AUTO 0
#define PRNG_MODE_TDES 1
#define PRNG_MODE_SHA512 2
static unsigned int prng_mode = PRNG_MODE_AUTO;
module_param_named(mode, prng_mode, int, 0);
MODULE_PARM_DESC(prng_mode, "PRNG mode: 0 - auto, 1 - TDES, 2 - SHA512");
#define PRNG_CHUNKSIZE_TDES_MIN 8
#define PRNG_CHUNKSIZE_TDES_MAX (64*1024)
#define PRNG_CHUNKSIZE_SHA512_MIN 64
#define PRNG_CHUNKSIZE_SHA512_MAX (64*1024)
static unsigned int prng_chunk_size = 256;
module_param_named(chunksize, prng_chunk_size, int, 0);
MODULE_PARM_DESC(prng_chunk_size, "PRNG read chunk size in bytes"); MODULE_PARM_DESC(prng_chunk_size, "PRNG read chunk size in bytes");
static int prng_entropy_limit = 4096;
module_param(prng_entropy_limit, int, S_IRUSR | S_IRGRP | S_IROTH | S_IWUSR); #define PRNG_RESEED_LIMIT_TDES 4096
MODULE_PARM_DESC(prng_entropy_limit, #define PRNG_RESEED_LIMIT_TDES_LOWER 4096
"PRNG add entropy after that much bytes were produced"); #define PRNG_RESEED_LIMIT_SHA512 100000
#define PRNG_RESEED_LIMIT_SHA512_LOWER 10000
static unsigned int prng_reseed_limit;
module_param_named(reseed_limit, prng_reseed_limit, int, 0);
MODULE_PARM_DESC(prng_reseed_limit, "PRNG reseed limit");
/* /*
* Any one who considers arithmetical methods of producing random digits is, * Any one who considers arithmetical methods of producing random digits is,
* of course, in a state of sin. -- John von Neumann * of course, in a state of sin. -- John von Neumann
*/ */
struct s390_prng_data { static int prng_errorflag;
unsigned long count; /* how many bytes were produced */
char *buf; #define PRNG_GEN_ENTROPY_FAILED 1
#define PRNG_SELFTEST_FAILED 2
#define PRNG_INSTANTIATE_FAILED 3
#define PRNG_SEED_FAILED 4
#define PRNG_RESEED_FAILED 5
#define PRNG_GEN_FAILED 6
struct prng_ws_s {
u8 parm_block[32];
u32 reseed_counter;
u64 byte_counter;
}; };
static struct s390_prng_data *p; struct ppno_ws_s {
u32 res;
/* copied from libica, use a non-zero initial parameter block */ u32 reseed_counter;
static unsigned char parm_block[32] = { u64 stream_bytes;
0x0F,0x2B,0x8E,0x63,0x8C,0x8E,0xD2,0x52,0x64,0xB7,0xA0,0x7B,0x75,0x28,0xB8,0xF4, u8 V[112];
0x75,0x5F,0xD2,0xA6,0x8D,0x97,0x11,0xFF,0x49,0xD8,0x23,0xF3,0x7E,0x21,0xEC,0xA0, u8 C[112];
}; };
static int prng_open(struct inode *inode, struct file *file) struct prng_data_s {
struct mutex mutex;
union {
struct prng_ws_s prngws;
struct ppno_ws_s ppnows;
};
u8 *buf;
u32 rest;
u8 *prev;
};
static struct prng_data_s *prng_data;
/* initial parameter block for tdes mode, copied from libica */
static const u8 initial_parm_block[32] __initconst = {
0x0F, 0x2B, 0x8E, 0x63, 0x8C, 0x8E, 0xD2, 0x52,
0x64, 0xB7, 0xA0, 0x7B, 0x75, 0x28, 0xB8, 0xF4,
0x75, 0x5F, 0xD2, 0xA6, 0x8D, 0x97, 0x11, 0xFF,
0x49, 0xD8, 0x23, 0xF3, 0x7E, 0x21, 0xEC, 0xA0 };
/*** helper functions ***/
static int generate_entropy(u8 *ebuf, size_t nbytes)
{ {
return nonseekable_open(inode, file); int n, ret = 0;
u8 *pg, *h, hash[32];
pg = (u8 *) __get_free_page(GFP_KERNEL);
if (!pg) {
prng_errorflag = PRNG_GEN_ENTROPY_FAILED;
return -ENOMEM;
}
while (nbytes) {
/* fill page with urandom bytes */
get_random_bytes(pg, PAGE_SIZE);
/* exor page with stckf values */
for (n = 0; n < sizeof(PAGE_SIZE/sizeof(u64)); n++) {
u64 *p = ((u64 *)pg) + n;
*p ^= get_tod_clock_fast();
}
n = (nbytes < sizeof(hash)) ? nbytes : sizeof(hash);
if (n < sizeof(hash))
h = hash;
else
h = ebuf;
/* generate sha256 from this page */
if (crypt_s390_kimd(KIMD_SHA_256, h,
pg, PAGE_SIZE) != PAGE_SIZE) {
prng_errorflag = PRNG_GEN_ENTROPY_FAILED;
ret = -EIO;
goto out;
}
if (n < sizeof(hash))
memcpy(ebuf, hash, n);
ret += n;
ebuf += n;
nbytes -= n;
}
out:
free_page((unsigned long)pg);
return ret;
} }
static void prng_add_entropy(void)
/*** tdes functions ***/
static void prng_tdes_add_entropy(void)
{ {
__u64 entropy[4]; __u64 entropy[4];
unsigned int i; unsigned int i;
int ret; int ret;
for (i = 0; i < 16; i++) { for (i = 0; i < 16; i++) {
ret = crypt_s390_kmc(KMC_PRNG, parm_block, (char *)entropy, ret = crypt_s390_kmc(KMC_PRNG, prng_data->prngws.parm_block,
(char *)entropy, sizeof(entropy)); (char *)entropy, (char *)entropy,
sizeof(entropy));
BUG_ON(ret < 0 || ret != sizeof(entropy)); BUG_ON(ret < 0 || ret != sizeof(entropy));
memcpy(parm_block, entropy, sizeof(entropy)); memcpy(prng_data->prngws.parm_block, entropy, sizeof(entropy));
} }
} }
static void prng_seed(int nbytes)
static void prng_tdes_seed(int nbytes)
{ {
char buf[16]; char buf[16];
int i = 0; int i = 0;
BUG_ON(nbytes > 16); BUG_ON(nbytes > sizeof(buf));
get_random_bytes(buf, nbytes); get_random_bytes(buf, nbytes);
/* Add the entropy */ /* Add the entropy */
while (nbytes >= 8) { while (nbytes >= 8) {
*((__u64 *)parm_block) ^= *((__u64 *)(buf+i)); *((__u64 *)prng_data->prngws.parm_block) ^= *((__u64 *)(buf+i));
prng_add_entropy(); prng_tdes_add_entropy();
i += 8; i += 8;
nbytes -= 8; nbytes -= 8;
} }
prng_add_entropy(); prng_tdes_add_entropy();
prng_data->prngws.reseed_counter = 0;
} }
static ssize_t prng_read(struct file *file, char __user *ubuf, size_t nbytes,
loff_t *ppos)
{
int chunk, n;
int ret = 0;
int tmp;
/* nbytes can be arbitrary length, we split it into chunks */ static int __init prng_tdes_instantiate(void)
{
int datalen;
pr_debug("prng runs in TDES mode with "
"chunksize=%d and reseed_limit=%u\n",
prng_chunk_size, prng_reseed_limit);
/* memory allocation, prng_data struct init, mutex init */
datalen = sizeof(struct prng_data_s) + prng_chunk_size;
prng_data = kzalloc(datalen, GFP_KERNEL);
if (!prng_data) {
prng_errorflag = PRNG_INSTANTIATE_FAILED;
return -ENOMEM;
}
mutex_init(&prng_data->mutex);
prng_data->buf = ((u8 *)prng_data) + sizeof(struct prng_data_s);
memcpy(prng_data->prngws.parm_block, initial_parm_block, 32);
/* initialize the PRNG, add 128 bits of entropy */
prng_tdes_seed(16);
return 0;
}
static void prng_tdes_deinstantiate(void)
{
pr_debug("The prng module stopped "
"after running in triple DES mode\n");
kzfree(prng_data);
}
/*** sha512 functions ***/
static int __init prng_sha512_selftest(void)
{
/* NIST DRBG testvector for Hash Drbg, Sha-512, Count #0 */
static const u8 seed[] __initconst = {
0x6b, 0x50, 0xa7, 0xd8, 0xf8, 0xa5, 0x5d, 0x7a,
0x3d, 0xf8, 0xbb, 0x40, 0xbc, 0xc3, 0xb7, 0x22,
0xd8, 0x70, 0x8d, 0xe6, 0x7f, 0xda, 0x01, 0x0b,
0x03, 0xc4, 0xc8, 0x4d, 0x72, 0x09, 0x6f, 0x8c,
0x3e, 0xc6, 0x49, 0xcc, 0x62, 0x56, 0xd9, 0xfa,
0x31, 0xdb, 0x7a, 0x29, 0x04, 0xaa, 0xf0, 0x25 };
static const u8 V0[] __initconst = {
0x00, 0xad, 0xe3, 0x6f, 0x9a, 0x01, 0xc7, 0x76,
0x61, 0x34, 0x35, 0xf5, 0x4e, 0x24, 0x74, 0x22,
0x21, 0x9a, 0x29, 0x89, 0xc7, 0x93, 0x2e, 0x60,
0x1e, 0xe8, 0x14, 0x24, 0x8d, 0xd5, 0x03, 0xf1,
0x65, 0x5d, 0x08, 0x22, 0x72, 0xd5, 0xad, 0x95,
0xe1, 0x23, 0x1e, 0x8a, 0xa7, 0x13, 0xd9, 0x2b,
0x5e, 0xbc, 0xbb, 0x80, 0xab, 0x8d, 0xe5, 0x79,
0xab, 0x5b, 0x47, 0x4e, 0xdd, 0xee, 0x6b, 0x03,
0x8f, 0x0f, 0x5c, 0x5e, 0xa9, 0x1a, 0x83, 0xdd,
0xd3, 0x88, 0xb2, 0x75, 0x4b, 0xce, 0x83, 0x36,
0x57, 0x4b, 0xf1, 0x5c, 0xca, 0x7e, 0x09, 0xc0,
0xd3, 0x89, 0xc6, 0xe0, 0xda, 0xc4, 0x81, 0x7e,
0x5b, 0xf9, 0xe1, 0x01, 0xc1, 0x92, 0x05, 0xea,
0xf5, 0x2f, 0xc6, 0xc6, 0xc7, 0x8f, 0xbc, 0xf4 };
static const u8 C0[] __initconst = {
0x00, 0xf4, 0xa3, 0xe5, 0xa0, 0x72, 0x63, 0x95,
0xc6, 0x4f, 0x48, 0xd0, 0x8b, 0x5b, 0x5f, 0x8e,
0x6b, 0x96, 0x1f, 0x16, 0xed, 0xbc, 0x66, 0x94,
0x45, 0x31, 0xd7, 0x47, 0x73, 0x22, 0xa5, 0x86,
0xce, 0xc0, 0x4c, 0xac, 0x63, 0xb8, 0x39, 0x50,
0xbf, 0xe6, 0x59, 0x6c, 0x38, 0x58, 0x99, 0x1f,
0x27, 0xa7, 0x9d, 0x71, 0x2a, 0xb3, 0x7b, 0xf9,
0xfb, 0x17, 0x86, 0xaa, 0x99, 0x81, 0xaa, 0x43,
0xe4, 0x37, 0xd3, 0x1e, 0x6e, 0xe5, 0xe6, 0xee,
0xc2, 0xed, 0x95, 0x4f, 0x53, 0x0e, 0x46, 0x8a,
0xcc, 0x45, 0xa5, 0xdb, 0x69, 0x0d, 0x81, 0xc9,
0x32, 0x92, 0xbc, 0x8f, 0x33, 0xe6, 0xf6, 0x09,
0x7c, 0x8e, 0x05, 0x19, 0x0d, 0xf1, 0xb6, 0xcc,
0xf3, 0x02, 0x21, 0x90, 0x25, 0xec, 0xed, 0x0e };
static const u8 random[] __initconst = {
0x95, 0xb7, 0xf1, 0x7e, 0x98, 0x02, 0xd3, 0x57,
0x73, 0x92, 0xc6, 0xa9, 0xc0, 0x80, 0x83, 0xb6,
0x7d, 0xd1, 0x29, 0x22, 0x65, 0xb5, 0xf4, 0x2d,
0x23, 0x7f, 0x1c, 0x55, 0xbb, 0x9b, 0x10, 0xbf,
0xcf, 0xd8, 0x2c, 0x77, 0xa3, 0x78, 0xb8, 0x26,
0x6a, 0x00, 0x99, 0x14, 0x3b, 0x3c, 0x2d, 0x64,
0x61, 0x1e, 0xee, 0xb6, 0x9a, 0xcd, 0xc0, 0x55,
0x95, 0x7c, 0x13, 0x9e, 0x8b, 0x19, 0x0c, 0x7a,
0x06, 0x95, 0x5f, 0x2c, 0x79, 0x7c, 0x27, 0x78,
0xde, 0x94, 0x03, 0x96, 0xa5, 0x01, 0xf4, 0x0e,
0x91, 0x39, 0x6a, 0xcf, 0x8d, 0x7e, 0x45, 0xeb,
0xdb, 0xb5, 0x3b, 0xbf, 0x8c, 0x97, 0x52, 0x30,
0xd2, 0xf0, 0xff, 0x91, 0x06, 0xc7, 0x61, 0x19,
0xae, 0x49, 0x8e, 0x7f, 0xbc, 0x03, 0xd9, 0x0f,
0x8e, 0x4c, 0x51, 0x62, 0x7a, 0xed, 0x5c, 0x8d,
0x42, 0x63, 0xd5, 0xd2, 0xb9, 0x78, 0x87, 0x3a,
0x0d, 0xe5, 0x96, 0xee, 0x6d, 0xc7, 0xf7, 0xc2,
0x9e, 0x37, 0xee, 0xe8, 0xb3, 0x4c, 0x90, 0xdd,
0x1c, 0xf6, 0xa9, 0xdd, 0xb2, 0x2b, 0x4c, 0xbd,
0x08, 0x6b, 0x14, 0xb3, 0x5d, 0xe9, 0x3d, 0xa2,
0xd5, 0xcb, 0x18, 0x06, 0x69, 0x8c, 0xbd, 0x7b,
0xbb, 0x67, 0xbf, 0xe3, 0xd3, 0x1f, 0xd2, 0xd1,
0xdb, 0xd2, 0xa1, 0xe0, 0x58, 0xa3, 0xeb, 0x99,
0xd7, 0xe5, 0x1f, 0x1a, 0x93, 0x8e, 0xed, 0x5e,
0x1c, 0x1d, 0xe2, 0x3a, 0x6b, 0x43, 0x45, 0xd3,
0x19, 0x14, 0x09, 0xf9, 0x2f, 0x39, 0xb3, 0x67,
0x0d, 0x8d, 0xbf, 0xb6, 0x35, 0xd8, 0xe6, 0xa3,
0x69, 0x32, 0xd8, 0x10, 0x33, 0xd1, 0x44, 0x8d,
0x63, 0xb4, 0x03, 0xdd, 0xf8, 0x8e, 0x12, 0x1b,
0x6e, 0x81, 0x9a, 0xc3, 0x81, 0x22, 0x6c, 0x13,
0x21, 0xe4, 0xb0, 0x86, 0x44, 0xf6, 0x72, 0x7c,
0x36, 0x8c, 0x5a, 0x9f, 0x7a, 0x4b, 0x3e, 0xe2 };
int ret = 0;
u8 buf[sizeof(random)];
struct ppno_ws_s ws;
memset(&ws, 0, sizeof(ws));
/* initial seed */
ret = crypt_s390_ppno(PPNO_SHA512_DRNG_SEED,
&ws, NULL, 0,
seed, sizeof(seed));
if (ret < 0) {
pr_err("The prng self test seed operation for the "
"SHA-512 mode failed with rc=%d\n", ret);
prng_errorflag = PRNG_SELFTEST_FAILED;
return -EIO;
}
/* check working states V and C */
if (memcmp(ws.V, V0, sizeof(V0)) != 0
|| memcmp(ws.C, C0, sizeof(C0)) != 0) {
pr_err("The prng self test state test "
"for the SHA-512 mode failed\n");
prng_errorflag = PRNG_SELFTEST_FAILED;
return -EIO;
}
/* generate random bytes */
ret = crypt_s390_ppno(PPNO_SHA512_DRNG_GEN,
&ws, buf, sizeof(buf),
NULL, 0);
if (ret < 0) {
pr_err("The prng self test generate operation for "
"the SHA-512 mode failed with rc=%d\n", ret);
prng_errorflag = PRNG_SELFTEST_FAILED;
return -EIO;
}
ret = crypt_s390_ppno(PPNO_SHA512_DRNG_GEN,
&ws, buf, sizeof(buf),
NULL, 0);
if (ret < 0) {
pr_err("The prng self test generate operation for "
"the SHA-512 mode failed with rc=%d\n", ret);
prng_errorflag = PRNG_SELFTEST_FAILED;
return -EIO;
}
/* check against expected data */
if (memcmp(buf, random, sizeof(random)) != 0) {
pr_err("The prng self test data test "
"for the SHA-512 mode failed\n");
prng_errorflag = PRNG_SELFTEST_FAILED;
return -EIO;
}
return 0;
}
static int __init prng_sha512_instantiate(void)
{
int ret, datalen;
u8 seed[64];
pr_debug("prng runs in SHA-512 mode "
"with chunksize=%d and reseed_limit=%u\n",
prng_chunk_size, prng_reseed_limit);
/* memory allocation, prng_data struct init, mutex init */
datalen = sizeof(struct prng_data_s) + prng_chunk_size;
if (fips_enabled)
datalen += prng_chunk_size;
prng_data = kzalloc(datalen, GFP_KERNEL);
if (!prng_data) {
prng_errorflag = PRNG_INSTANTIATE_FAILED;
return -ENOMEM;
}
mutex_init(&prng_data->mutex);
prng_data->buf = ((u8 *)prng_data) + sizeof(struct prng_data_s);
/* selftest */
ret = prng_sha512_selftest();
if (ret)
goto outfree;
/* generate initial seed bytestring, first 48 bytes of entropy */
ret = generate_entropy(seed, 48);
if (ret != 48)
goto outfree;
/* followed by 16 bytes of unique nonce */
get_tod_clock_ext(seed + 48);
/* initial seed of the ppno drng */
ret = crypt_s390_ppno(PPNO_SHA512_DRNG_SEED,
&prng_data->ppnows, NULL, 0,
seed, sizeof(seed));
if (ret < 0) {
prng_errorflag = PRNG_SEED_FAILED;
ret = -EIO;
goto outfree;
}
/* if fips mode is enabled, generate a first block of random
bytes for the FIPS 140-2 Conditional Self Test */
if (fips_enabled) {
prng_data->prev = prng_data->buf + prng_chunk_size;
ret = crypt_s390_ppno(PPNO_SHA512_DRNG_GEN,
&prng_data->ppnows,
prng_data->prev,
prng_chunk_size,
NULL, 0);
if (ret < 0 || ret != prng_chunk_size) {
prng_errorflag = PRNG_GEN_FAILED;
ret = -EIO;
goto outfree;
}
}
return 0;
outfree:
kfree(prng_data);
return ret;
}
static void prng_sha512_deinstantiate(void)
{
pr_debug("The prng module stopped after running in SHA-512 mode\n");
kzfree(prng_data);
}
static int prng_sha512_reseed(void)
{
int ret;
u8 seed[32];
/* generate 32 bytes of fresh entropy */
ret = generate_entropy(seed, sizeof(seed));
if (ret != sizeof(seed))
return ret;
/* do a reseed of the ppno drng with this bytestring */
ret = crypt_s390_ppno(PPNO_SHA512_DRNG_SEED,
&prng_data->ppnows, NULL, 0,
seed, sizeof(seed));
if (ret) {
prng_errorflag = PRNG_RESEED_FAILED;
return -EIO;
}
return 0;
}
static int prng_sha512_generate(u8 *buf, size_t nbytes)
{
int ret;
/* reseed needed ? */
if (prng_data->ppnows.reseed_counter > prng_reseed_limit) {
ret = prng_sha512_reseed();
if (ret)
return ret;
}
/* PPNO generate */
ret = crypt_s390_ppno(PPNO_SHA512_DRNG_GEN,
&prng_data->ppnows, buf, nbytes,
NULL, 0);
if (ret < 0 || ret != nbytes) {
prng_errorflag = PRNG_GEN_FAILED;
return -EIO;
}
/* FIPS 140-2 Conditional Self Test */
if (fips_enabled) {
if (!memcmp(prng_data->prev, buf, nbytes)) {
prng_errorflag = PRNG_GEN_FAILED;
return -EILSEQ;
}
memcpy(prng_data->prev, buf, nbytes);
}
return ret;
}
/*** file io functions ***/
static int prng_open(struct inode *inode, struct file *file)
{
return nonseekable_open(inode, file);
}
static ssize_t prng_tdes_read(struct file *file, char __user *ubuf,
size_t nbytes, loff_t *ppos)
{
int chunk, n, tmp, ret = 0;
/* lock prng_data struct */
if (mutex_lock_interruptible(&prng_data->mutex))
return -ERESTARTSYS;
while (nbytes) { while (nbytes) {
/* same as in extract_entropy_user in random.c */
if (need_resched()) { if (need_resched()) {
if (signal_pending(current)) { if (signal_pending(current)) {
if (ret == 0) if (ret == 0)
ret = -ERESTARTSYS; ret = -ERESTARTSYS;
break; break;
} }
/* give mutex free before calling schedule() */
mutex_unlock(&prng_data->mutex);
schedule(); schedule();
/* occopy mutex again */
if (mutex_lock_interruptible(&prng_data->mutex)) {
if (ret == 0)
ret = -ERESTARTSYS;
return ret;
}
} }
/* /*
@ -112,12 +535,11 @@ static ssize_t prng_read(struct file *file, char __user *ubuf, size_t nbytes,
/* PRNG only likes multiples of 8 bytes */ /* PRNG only likes multiples of 8 bytes */
n = (chunk + 7) & -8; n = (chunk + 7) & -8;
if (p->count > prng_entropy_limit) if (prng_data->prngws.reseed_counter > prng_reseed_limit)
prng_seed(8); prng_tdes_seed(8);
/* if the CPU supports PRNG stckf is present too */ /* if the CPU supports PRNG stckf is present too */
asm volatile(".insn s,0xb27c0000,%0" *((unsigned long long *)prng_data->buf) = get_tod_clock_fast();
: "=m" (*((unsigned long long *)p->buf)) : : "cc");
/* /*
* Beside the STCKF the input for the TDES-EDE is the output * Beside the STCKF the input for the TDES-EDE is the output
@ -132,34 +554,258 @@ static ssize_t prng_read(struct file *file, char __user *ubuf, size_t nbytes,
* Note: you can still get strict X9.17 conformity by setting * Note: you can still get strict X9.17 conformity by setting
* prng_chunk_size to 8 bytes. * prng_chunk_size to 8 bytes.
*/ */
tmp = crypt_s390_kmc(KMC_PRNG, parm_block, p->buf, p->buf, n); tmp = crypt_s390_kmc(KMC_PRNG, prng_data->prngws.parm_block,
BUG_ON((tmp < 0) || (tmp != n)); prng_data->buf, prng_data->buf, n);
if (tmp < 0 || tmp != n) {
ret = -EIO;
break;
}
p->count += n; prng_data->prngws.byte_counter += n;
prng_data->prngws.reseed_counter += n;
if (copy_to_user(ubuf, p->buf, chunk)) if (copy_to_user(ubuf, prng_data->buf, chunk))
return -EFAULT; return -EFAULT;
nbytes -= chunk; nbytes -= chunk;
ret += chunk; ret += chunk;
ubuf += chunk; ubuf += chunk;
} }
/* unlock prng_data struct */
mutex_unlock(&prng_data->mutex);
return ret; return ret;
} }
static const struct file_operations prng_fops = {
static ssize_t prng_sha512_read(struct file *file, char __user *ubuf,
size_t nbytes, loff_t *ppos)
{
int n, ret = 0;
u8 *p;
/* if errorflag is set do nothing and return 'broken pipe' */
if (prng_errorflag)
return -EPIPE;
/* lock prng_data struct */
if (mutex_lock_interruptible(&prng_data->mutex))
return -ERESTARTSYS;
while (nbytes) {
if (need_resched()) {
if (signal_pending(current)) {
if (ret == 0)
ret = -ERESTARTSYS;
break;
}
/* give mutex free before calling schedule() */
mutex_unlock(&prng_data->mutex);
schedule();
/* occopy mutex again */
if (mutex_lock_interruptible(&prng_data->mutex)) {
if (ret == 0)
ret = -ERESTARTSYS;
return ret;
}
}
if (prng_data->rest) {
/* push left over random bytes from the previous read */
p = prng_data->buf + prng_chunk_size - prng_data->rest;
n = (nbytes < prng_data->rest) ?
nbytes : prng_data->rest;
prng_data->rest -= n;
} else {
/* generate one chunk of random bytes into read buf */
p = prng_data->buf;
n = prng_sha512_generate(p, prng_chunk_size);
if (n < 0) {
ret = n;
break;
}
if (nbytes < prng_chunk_size) {
n = nbytes;
prng_data->rest = prng_chunk_size - n;
} else {
n = prng_chunk_size;
prng_data->rest = 0;
}
}
if (copy_to_user(ubuf, p, n)) {
ret = -EFAULT;
break;
}
ubuf += n;
nbytes -= n;
ret += n;
}
/* unlock prng_data struct */
mutex_unlock(&prng_data->mutex);
return ret;
}
/*** sysfs stuff ***/
static const struct file_operations prng_sha512_fops = {
.owner = THIS_MODULE, .owner = THIS_MODULE,
.open = &prng_open, .open = &prng_open,
.release = NULL, .release = NULL,
.read = &prng_read, .read = &prng_sha512_read,
.llseek = noop_llseek,
};
static const struct file_operations prng_tdes_fops = {
.owner = THIS_MODULE,
.open = &prng_open,
.release = NULL,
.read = &prng_tdes_read,
.llseek = noop_llseek, .llseek = noop_llseek,
}; };
static struct miscdevice prng_dev = { static struct miscdevice prng_sha512_dev = {
.name = "prandom", .name = "prandom",
.minor = MISC_DYNAMIC_MINOR, .minor = MISC_DYNAMIC_MINOR,
.fops = &prng_fops, .fops = &prng_sha512_fops,
}; };
static struct miscdevice prng_tdes_dev = {
.name = "prandom",
.minor = MISC_DYNAMIC_MINOR,
.fops = &prng_tdes_fops,
};
/* chunksize attribute (ro) */
static ssize_t prng_chunksize_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
return snprintf(buf, PAGE_SIZE, "%u\n", prng_chunk_size);
}
static DEVICE_ATTR(chunksize, 0444, prng_chunksize_show, NULL);
/* counter attribute (ro) */
static ssize_t prng_counter_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
u64 counter;
if (mutex_lock_interruptible(&prng_data->mutex))
return -ERESTARTSYS;
if (prng_mode == PRNG_MODE_SHA512)
counter = prng_data->ppnows.stream_bytes;
else
counter = prng_data->prngws.byte_counter;
mutex_unlock(&prng_data->mutex);
return snprintf(buf, PAGE_SIZE, "%llu\n", counter);
}
static DEVICE_ATTR(byte_counter, 0444, prng_counter_show, NULL);
/* errorflag attribute (ro) */
static ssize_t prng_errorflag_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
return snprintf(buf, PAGE_SIZE, "%d\n", prng_errorflag);
}
static DEVICE_ATTR(errorflag, 0444, prng_errorflag_show, NULL);
/* mode attribute (ro) */
static ssize_t prng_mode_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
if (prng_mode == PRNG_MODE_TDES)
return snprintf(buf, PAGE_SIZE, "TDES\n");
else
return snprintf(buf, PAGE_SIZE, "SHA512\n");
}
static DEVICE_ATTR(mode, 0444, prng_mode_show, NULL);
/* reseed attribute (w) */
static ssize_t prng_reseed_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
if (mutex_lock_interruptible(&prng_data->mutex))
return -ERESTARTSYS;
prng_sha512_reseed();
mutex_unlock(&prng_data->mutex);
return count;
}
static DEVICE_ATTR(reseed, 0200, NULL, prng_reseed_store);
/* reseed limit attribute (rw) */
static ssize_t prng_reseed_limit_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
return snprintf(buf, PAGE_SIZE, "%u\n", prng_reseed_limit);
}
static ssize_t prng_reseed_limit_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
unsigned limit;
if (sscanf(buf, "%u\n", &limit) != 1)
return -EINVAL;
if (prng_mode == PRNG_MODE_SHA512) {
if (limit < PRNG_RESEED_LIMIT_SHA512_LOWER)
return -EINVAL;
} else {
if (limit < PRNG_RESEED_LIMIT_TDES_LOWER)
return -EINVAL;
}
prng_reseed_limit = limit;
return count;
}
static DEVICE_ATTR(reseed_limit, 0644,
prng_reseed_limit_show, prng_reseed_limit_store);
/* strength attribute (ro) */
static ssize_t prng_strength_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
return snprintf(buf, PAGE_SIZE, "256\n");
}
static DEVICE_ATTR(strength, 0444, prng_strength_show, NULL);
static struct attribute *prng_sha512_dev_attrs[] = {
&dev_attr_errorflag.attr,
&dev_attr_chunksize.attr,
&dev_attr_byte_counter.attr,
&dev_attr_mode.attr,
&dev_attr_reseed.attr,
&dev_attr_reseed_limit.attr,
&dev_attr_strength.attr,
NULL
};
static struct attribute *prng_tdes_dev_attrs[] = {
&dev_attr_chunksize.attr,
&dev_attr_byte_counter.attr,
&dev_attr_mode.attr,
NULL
};
static struct attribute_group prng_sha512_dev_attr_group = {
.attrs = prng_sha512_dev_attrs
};
static struct attribute_group prng_tdes_dev_attr_group = {
.attrs = prng_tdes_dev_attrs
};
/*** module init and exit ***/
static int __init prng_init(void) static int __init prng_init(void)
{ {
@ -169,43 +815,105 @@ static int __init prng_init(void)
if (!crypt_s390_func_available(KMC_PRNG, CRYPT_S390_MSA)) if (!crypt_s390_func_available(KMC_PRNG, CRYPT_S390_MSA))
return -EOPNOTSUPP; return -EOPNOTSUPP;
if (prng_chunk_size < 8) /* choose prng mode */
return -EINVAL; if (prng_mode != PRNG_MODE_TDES) {
/* check for MSA5 support for PPNO operations */
p = kmalloc(sizeof(struct s390_prng_data), GFP_KERNEL); if (!crypt_s390_func_available(PPNO_SHA512_DRNG_GEN,
if (!p) CRYPT_S390_MSA5)) {
return -ENOMEM; if (prng_mode == PRNG_MODE_SHA512) {
p->count = 0; pr_err("The prng module cannot "
"start in SHA-512 mode\n");
p->buf = kmalloc(prng_chunk_size, GFP_KERNEL); return -EOPNOTSUPP;
if (!p->buf) { }
ret = -ENOMEM; prng_mode = PRNG_MODE_TDES;
goto out_free; } else
prng_mode = PRNG_MODE_SHA512;
} }
/* initialize the PRNG, add 128 bits of entropy */ if (prng_mode == PRNG_MODE_SHA512) {
prng_seed(16);
ret = misc_register(&prng_dev); /* SHA512 mode */
if (ret)
goto out_buf;
return 0;
out_buf: if (prng_chunk_size < PRNG_CHUNKSIZE_SHA512_MIN
kfree(p->buf); || prng_chunk_size > PRNG_CHUNKSIZE_SHA512_MAX)
out_free: return -EINVAL;
kfree(p); prng_chunk_size = (prng_chunk_size + 0x3f) & ~0x3f;
if (prng_reseed_limit == 0)
prng_reseed_limit = PRNG_RESEED_LIMIT_SHA512;
else if (prng_reseed_limit < PRNG_RESEED_LIMIT_SHA512_LOWER)
return -EINVAL;
ret = prng_sha512_instantiate();
if (ret)
goto out;
ret = misc_register(&prng_sha512_dev);
if (ret) {
prng_sha512_deinstantiate();
goto out;
}
ret = sysfs_create_group(&prng_sha512_dev.this_device->kobj,
&prng_sha512_dev_attr_group);
if (ret) {
misc_deregister(&prng_sha512_dev);
prng_sha512_deinstantiate();
goto out;
}
} else {
/* TDES mode */
if (prng_chunk_size < PRNG_CHUNKSIZE_TDES_MIN
|| prng_chunk_size > PRNG_CHUNKSIZE_TDES_MAX)
return -EINVAL;
prng_chunk_size = (prng_chunk_size + 0x07) & ~0x07;
if (prng_reseed_limit == 0)
prng_reseed_limit = PRNG_RESEED_LIMIT_TDES;
else if (prng_reseed_limit < PRNG_RESEED_LIMIT_TDES_LOWER)
return -EINVAL;
ret = prng_tdes_instantiate();
if (ret)
goto out;
ret = misc_register(&prng_tdes_dev);
if (ret) {
prng_tdes_deinstantiate();
goto out;
}
ret = sysfs_create_group(&prng_tdes_dev.this_device->kobj,
&prng_tdes_dev_attr_group);
if (ret) {
misc_deregister(&prng_tdes_dev);
prng_tdes_deinstantiate();
goto out;
}
}
out:
return ret; return ret;
} }
static void __exit prng_exit(void) static void __exit prng_exit(void)
{ {
/* wipe me */ if (prng_mode == PRNG_MODE_SHA512) {
kzfree(p->buf); sysfs_remove_group(&prng_sha512_dev.this_device->kobj,
kfree(p); &prng_sha512_dev_attr_group);
misc_deregister(&prng_sha512_dev);
misc_deregister(&prng_dev); prng_sha512_deinstantiate();
} else {
sysfs_remove_group(&prng_tdes_dev.this_device->kobj,
&prng_tdes_dev_attr_group);
misc_deregister(&prng_tdes_dev);
prng_tdes_deinstantiate();
}
} }
module_init(prng_init); module_init(prng_init);
module_exit(prng_exit); module_exit(prng_exit);