1240 lines
32 KiB
C
1240 lines
32 KiB
C
/*
|
|
* Support for VIA PadLock Advanced Cryptography Engine (ACE)
|
|
* Written by Michal Ludvig <michal@logix.cz>
|
|
* http://www.logix.cz/michal
|
|
*
|
|
* Big thanks to Andy Polyakov for a help with optimization,
|
|
* assembler fixes, port to MS Windows and a lot of other
|
|
* valuable work on this engine!
|
|
*/
|
|
|
|
/* ====================================================================
|
|
* Copyright (c) 1999-2001 The OpenSSL Project. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
*
|
|
* 3. All advertising materials mentioning features or use of this
|
|
* software must display the following acknowledgment:
|
|
* "This product includes software developed by the OpenSSL Project
|
|
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
|
|
*
|
|
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
|
|
* endorse or promote products derived from this software without
|
|
* prior written permission. For written permission, please contact
|
|
* licensing@OpenSSL.org.
|
|
*
|
|
* 5. Products derived from this software may not be called "OpenSSL"
|
|
* nor may "OpenSSL" appear in their names without prior written
|
|
* permission of the OpenSSL Project.
|
|
*
|
|
* 6. Redistributions of any form whatsoever must retain the following
|
|
* acknowledgment:
|
|
* "This product includes software developed by the OpenSSL Project
|
|
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
|
|
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
|
|
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
|
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
|
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
|
|
* OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
* ====================================================================
|
|
*
|
|
* This product includes cryptographic software written by Eric Young
|
|
* (eay@cryptsoft.com). This product includes software written by Tim
|
|
* Hudson (tjh@cryptsoft.com).
|
|
*
|
|
*/
|
|
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
#include <openssl/opensslconf.h>
|
|
#include <openssl/crypto.h>
|
|
#include <openssl/dso.h>
|
|
#include <openssl/engine.h>
|
|
#include <openssl/evp.h>
|
|
#ifndef OPENSSL_NO_AES
|
|
#include <openssl/aes.h>
|
|
#endif
|
|
#include <openssl/rand.h>
|
|
#include <openssl/err.h>
|
|
|
|
#ifndef OPENSSL_NO_HW
|
|
#ifndef OPENSSL_NO_HW_PADLOCK
|
|
|
|
/* Attempt to have a single source for both 0.9.7 and 0.9.8 :-) */
|
|
#if (OPENSSL_VERSION_NUMBER >= 0x00908000L)
|
|
# ifndef OPENSSL_NO_DYNAMIC_ENGINE
|
|
# define DYNAMIC_ENGINE
|
|
# endif
|
|
#elif (OPENSSL_VERSION_NUMBER >= 0x00907000L)
|
|
# ifdef ENGINE_DYNAMIC_SUPPORT
|
|
# define DYNAMIC_ENGINE
|
|
# endif
|
|
#else
|
|
# error "Only OpenSSL >= 0.9.7 is supported"
|
|
#endif
|
|
|
|
/* VIA PadLock AES is available *ONLY* on some x86 CPUs.
|
|
Not only that it doesn't exist elsewhere, but it
|
|
even can't be compiled on other platforms!
|
|
|
|
In addition, because of the heavy use of inline assembler,
|
|
compiler choice is limited to GCC and Microsoft C. */
|
|
#undef COMPILE_HW_PADLOCK
|
|
#if !defined(I386_ONLY) && !defined(OPENSSL_NO_INLINE_ASM)
|
|
# if (defined(__GNUC__) && (defined(__i386__) || defined(__i386))) || \
|
|
(defined(_MSC_VER) && defined(_M_IX86))
|
|
# define COMPILE_HW_PADLOCK
|
|
# endif
|
|
#endif
|
|
|
|
#ifdef OPENSSL_NO_DYNAMIC_ENGINE
|
|
#ifdef COMPILE_HW_PADLOCK
|
|
static ENGINE *ENGINE_padlock (void);
|
|
#endif
|
|
|
|
void ENGINE_load_padlock (void)
|
|
{
|
|
/* On non-x86 CPUs it just returns. */
|
|
#ifdef COMPILE_HW_PADLOCK
|
|
ENGINE *toadd = ENGINE_padlock ();
|
|
if (!toadd) return;
|
|
ENGINE_add (toadd);
|
|
ENGINE_free (toadd);
|
|
ERR_clear_error ();
|
|
#endif
|
|
}
|
|
|
|
#endif
|
|
|
|
#ifdef COMPILE_HW_PADLOCK
|
|
/* We do these includes here to avoid header problems on platforms that
|
|
do not have the VIA padlock anyway... */
|
|
#include <stdlib.h>
|
|
#ifdef _WIN32
|
|
# include <malloc.h>
|
|
# ifndef alloca
|
|
# define alloca _alloca
|
|
# endif
|
|
#elif defined(__GNUC__)
|
|
# ifndef alloca
|
|
# define alloca(s) __builtin_alloca(s)
|
|
# endif
|
|
#endif
|
|
|
|
/* Function for ENGINE detection and control */
|
|
static int padlock_available(void);
|
|
static int padlock_init(ENGINE *e);
|
|
|
|
/* RNG Stuff */
|
|
static RAND_METHOD padlock_rand;
|
|
|
|
/* Cipher Stuff */
|
|
#ifndef OPENSSL_NO_AES
|
|
static int padlock_ciphers(ENGINE *e, const EVP_CIPHER **cipher, const int **nids, int nid);
|
|
#endif
|
|
|
|
/* Engine names */
|
|
static const char *padlock_id = "padlock";
|
|
static char padlock_name[100];
|
|
|
|
/* Available features */
|
|
static int padlock_use_ace = 0; /* Advanced Cryptography Engine */
|
|
static int padlock_use_rng = 0; /* Random Number Generator */
|
|
#ifndef OPENSSL_NO_AES
|
|
static int padlock_aes_align_required = 1;
|
|
#endif
|
|
|
|
/* ===== Engine "management" functions ===== */
|
|
|
|
/* Prepare the ENGINE structure for registration */
|
|
static int
|
|
padlock_bind_helper(ENGINE *e)
|
|
{
|
|
/* Check available features */
|
|
padlock_available();
|
|
|
|
#if 1 /* disable RNG for now, see commentary in vicinity of RNG code */
|
|
padlock_use_rng=0;
|
|
#endif
|
|
|
|
/* Generate a nice engine name with available features */
|
|
BIO_snprintf(padlock_name, sizeof(padlock_name),
|
|
"VIA PadLock (%s, %s)",
|
|
padlock_use_rng ? "RNG" : "no-RNG",
|
|
padlock_use_ace ? "ACE" : "no-ACE");
|
|
|
|
/* Register everything or return with an error */
|
|
if (!ENGINE_set_id(e, padlock_id) ||
|
|
!ENGINE_set_name(e, padlock_name) ||
|
|
|
|
!ENGINE_set_init_function(e, padlock_init) ||
|
|
#ifndef OPENSSL_NO_AES
|
|
(padlock_use_ace && !ENGINE_set_ciphers (e, padlock_ciphers)) ||
|
|
#endif
|
|
(padlock_use_rng && !ENGINE_set_RAND (e, &padlock_rand))) {
|
|
return 0;
|
|
}
|
|
|
|
/* Everything looks good */
|
|
return 1;
|
|
}
|
|
|
|
#ifdef OPENSSL_NO_DYNAMIC_ENGINE
|
|
|
|
/* Constructor */
|
|
static ENGINE *
|
|
ENGINE_padlock(void)
|
|
{
|
|
ENGINE *eng = ENGINE_new();
|
|
|
|
if (!eng) {
|
|
return NULL;
|
|
}
|
|
|
|
if (!padlock_bind_helper(eng)) {
|
|
ENGINE_free(eng);
|
|
return NULL;
|
|
}
|
|
|
|
return eng;
|
|
}
|
|
|
|
#endif
|
|
|
|
/* Check availability of the engine */
|
|
static int
|
|
padlock_init(ENGINE *e)
|
|
{
|
|
return (padlock_use_rng || padlock_use_ace);
|
|
}
|
|
|
|
/* This stuff is needed if this ENGINE is being compiled into a self-contained
|
|
* shared-library.
|
|
*/
|
|
#ifdef DYNAMIC_ENGINE
|
|
static int
|
|
padlock_bind_fn(ENGINE *e, const char *id)
|
|
{
|
|
if (id && (strcmp(id, padlock_id) != 0)) {
|
|
return 0;
|
|
}
|
|
|
|
if (!padlock_bind_helper(e)) {
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
IMPLEMENT_DYNAMIC_CHECK_FN()
|
|
IMPLEMENT_DYNAMIC_BIND_FN (padlock_bind_fn)
|
|
#endif /* DYNAMIC_ENGINE */
|
|
|
|
/* ===== Here comes the "real" engine ===== */
|
|
|
|
#ifndef OPENSSL_NO_AES
|
|
/* Some AES-related constants */
|
|
#define AES_BLOCK_SIZE 16
|
|
#define AES_KEY_SIZE_128 16
|
|
#define AES_KEY_SIZE_192 24
|
|
#define AES_KEY_SIZE_256 32
|
|
|
|
/* Here we store the status information relevant to the
|
|
current context. */
|
|
/* BIG FAT WARNING:
|
|
* Inline assembler in PADLOCK_XCRYPT_ASM()
|
|
* depends on the order of items in this structure.
|
|
* Don't blindly modify, reorder, etc!
|
|
*/
|
|
struct padlock_cipher_data
|
|
{
|
|
unsigned char iv[AES_BLOCK_SIZE]; /* Initialization vector */
|
|
union { unsigned int pad[4];
|
|
struct {
|
|
int rounds:4;
|
|
int dgst:1; /* n/a in C3 */
|
|
int align:1; /* n/a in C3 */
|
|
int ciphr:1; /* n/a in C3 */
|
|
unsigned int keygen:1;
|
|
int interm:1;
|
|
unsigned int encdec:1;
|
|
int ksize:2;
|
|
} b;
|
|
} cword; /* Control word */
|
|
AES_KEY ks; /* Encryption key */
|
|
};
|
|
|
|
/*
|
|
* Essentially this variable belongs in thread local storage.
|
|
* Having this variable global on the other hand can only cause
|
|
* few bogus key reloads [if any at all on single-CPU system],
|
|
* so we accept the penatly...
|
|
*/
|
|
static volatile struct padlock_cipher_data *padlock_saved_context;
|
|
#endif
|
|
|
|
/*
|
|
* =======================================================
|
|
* Inline assembler section(s).
|
|
* =======================================================
|
|
* Order of arguments is chosen to facilitate Windows port
|
|
* using __fastcall calling convention. If you wish to add
|
|
* more routines, keep in mind that first __fastcall
|
|
* argument is passed in %ecx and second - in %edx.
|
|
* =======================================================
|
|
*/
|
|
#if defined(__GNUC__) && __GNUC__>=2
|
|
/*
|
|
* As for excessive "push %ebx"/"pop %ebx" found all over.
|
|
* When generating position-independent code GCC won't let
|
|
* us use "b" in assembler templates nor even respect "ebx"
|
|
* in "clobber description." Therefore the trouble...
|
|
*/
|
|
|
|
/* Helper function - check if a CPUID instruction
|
|
is available on this CPU */
|
|
static int
|
|
padlock_insn_cpuid_available(void)
|
|
{
|
|
int result = -1;
|
|
|
|
/* We're checking if the bit #21 of EFLAGS
|
|
can be toggled. If yes = CPUID is available. */
|
|
asm volatile (
|
|
"pushf\n"
|
|
"popl %%eax\n"
|
|
"xorl $0x200000, %%eax\n"
|
|
"movl %%eax, %%ecx\n"
|
|
"andl $0x200000, %%ecx\n"
|
|
"pushl %%eax\n"
|
|
"popf\n"
|
|
"pushf\n"
|
|
"popl %%eax\n"
|
|
"andl $0x200000, %%eax\n"
|
|
"xorl %%eax, %%ecx\n"
|
|
"movl %%ecx, %0\n"
|
|
: "=r" (result) : : "eax", "ecx");
|
|
|
|
return (result == 0);
|
|
}
|
|
|
|
/* Load supported features of the CPU to see if
|
|
the PadLock is available. */
|
|
static int
|
|
padlock_available(void)
|
|
{
|
|
char vendor_string[16];
|
|
unsigned int eax, edx;
|
|
|
|
/* First check if the CPUID instruction is available at all... */
|
|
if (! padlock_insn_cpuid_available())
|
|
return 0;
|
|
|
|
/* Are we running on the Centaur (VIA) CPU? */
|
|
eax = 0x00000000;
|
|
vendor_string[12] = 0;
|
|
asm volatile (
|
|
"pushl %%ebx\n"
|
|
"cpuid\n"
|
|
"movl %%ebx,(%%edi)\n"
|
|
"movl %%edx,4(%%edi)\n"
|
|
"movl %%ecx,8(%%edi)\n"
|
|
"popl %%ebx"
|
|
: "+a"(eax) : "D"(vendor_string) : "ecx", "edx");
|
|
if (strcmp(vendor_string, "CentaurHauls") != 0)
|
|
return 0;
|
|
|
|
/* Check for Centaur Extended Feature Flags presence */
|
|
eax = 0xC0000000;
|
|
asm volatile ("pushl %%ebx; cpuid; popl %%ebx"
|
|
: "+a"(eax) : : "ecx", "edx");
|
|
if (eax < 0xC0000001)
|
|
return 0;
|
|
|
|
/* Read the Centaur Extended Feature Flags */
|
|
eax = 0xC0000001;
|
|
asm volatile ("pushl %%ebx; cpuid; popl %%ebx"
|
|
: "+a"(eax), "=d"(edx) : : "ecx");
|
|
|
|
/* Fill up some flags */
|
|
padlock_use_ace = ((edx & (0x3<<6)) == (0x3<<6));
|
|
padlock_use_rng = ((edx & (0x3<<2)) == (0x3<<2));
|
|
|
|
return padlock_use_ace + padlock_use_rng;
|
|
}
|
|
|
|
#ifndef OPENSSL_NO_AES
|
|
/* Our own htonl()/ntohl() */
|
|
static inline void
|
|
padlock_bswapl(AES_KEY *ks)
|
|
{
|
|
size_t i = sizeof(ks->rd_key)/sizeof(ks->rd_key[0]);
|
|
unsigned int *key = ks->rd_key;
|
|
|
|
while (i--) {
|
|
asm volatile ("bswapl %0" : "+r"(*key));
|
|
key++;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* Force key reload from memory to the CPU microcode.
|
|
Loading EFLAGS from the stack clears EFLAGS[30]
|
|
which does the trick. */
|
|
static inline void
|
|
padlock_reload_key(void)
|
|
{
|
|
asm volatile ("pushfl; popfl");
|
|
}
|
|
|
|
#ifndef OPENSSL_NO_AES
|
|
/*
|
|
* This is heuristic key context tracing. At first one
|
|
* believes that one should use atomic swap instructions,
|
|
* but it's not actually necessary. Point is that if
|
|
* padlock_saved_context was changed by another thread
|
|
* after we've read it and before we compare it with cdata,
|
|
* our key *shall* be reloaded upon thread context switch
|
|
* and we are therefore set in either case...
|
|
*/
|
|
static inline void
|
|
padlock_verify_context(struct padlock_cipher_data *cdata)
|
|
{
|
|
asm volatile (
|
|
"pushfl\n"
|
|
" btl $30,(%%esp)\n"
|
|
" jnc 1f\n"
|
|
" cmpl %2,%1\n"
|
|
" je 1f\n"
|
|
" popfl\n"
|
|
" subl $4,%%esp\n"
|
|
"1: addl $4,%%esp\n"
|
|
" movl %2,%0"
|
|
:"+m"(padlock_saved_context)
|
|
: "r"(padlock_saved_context), "r"(cdata) : "cc");
|
|
}
|
|
|
|
/* Template for padlock_xcrypt_* modes */
|
|
/* BIG FAT WARNING:
|
|
* The offsets used with 'leal' instructions
|
|
* describe items of the 'padlock_cipher_data'
|
|
* structure.
|
|
*/
|
|
#define PADLOCK_XCRYPT_ASM(name,rep_xcrypt) \
|
|
static inline void *name(size_t cnt, \
|
|
struct padlock_cipher_data *cdata, \
|
|
void *out, const void *inp) \
|
|
{ void *iv; \
|
|
asm volatile ( "pushl %%ebx\n" \
|
|
" leal 16(%0),%%edx\n" \
|
|
" leal 32(%0),%%ebx\n" \
|
|
rep_xcrypt "\n" \
|
|
" popl %%ebx" \
|
|
: "=a"(iv), "=c"(cnt), "=D"(out), "=S"(inp) \
|
|
: "0"(cdata), "1"(cnt), "2"(out), "3"(inp) \
|
|
: "edx", "cc", "memory"); \
|
|
return iv; \
|
|
}
|
|
|
|
/* Generate all functions with appropriate opcodes */
|
|
PADLOCK_XCRYPT_ASM(padlock_xcrypt_ecb, ".byte 0xf3,0x0f,0xa7,0xc8") /* rep xcryptecb */
|
|
PADLOCK_XCRYPT_ASM(padlock_xcrypt_cbc, ".byte 0xf3,0x0f,0xa7,0xd0") /* rep xcryptcbc */
|
|
PADLOCK_XCRYPT_ASM(padlock_xcrypt_cfb, ".byte 0xf3,0x0f,0xa7,0xe0") /* rep xcryptcfb */
|
|
PADLOCK_XCRYPT_ASM(padlock_xcrypt_ofb, ".byte 0xf3,0x0f,0xa7,0xe8") /* rep xcryptofb */
|
|
#endif
|
|
|
|
/* The RNG call itself */
|
|
static inline unsigned int
|
|
padlock_xstore(void *addr, unsigned int edx_in)
|
|
{
|
|
unsigned int eax_out;
|
|
|
|
asm volatile (".byte 0x0f,0xa7,0xc0" /* xstore */
|
|
: "=a"(eax_out),"=m"(*(unsigned *)addr)
|
|
: "D"(addr), "d" (edx_in)
|
|
);
|
|
|
|
return eax_out;
|
|
}
|
|
|
|
/* Why not inline 'rep movsd'? I failed to find information on what
|
|
* value in Direction Flag one can expect and consequently have to
|
|
* apply "better-safe-than-sorry" approach and assume "undefined."
|
|
* I could explicitly clear it and restore the original value upon
|
|
* return from padlock_aes_cipher, but it's presumably too much
|
|
* trouble for too little gain...
|
|
*
|
|
* In case you wonder 'rep xcrypt*' instructions above are *not*
|
|
* affected by the Direction Flag and pointers advance toward
|
|
* larger addresses unconditionally.
|
|
*/
|
|
static inline unsigned char *
|
|
padlock_memcpy(void *dst,const void *src,size_t n)
|
|
{
|
|
long *d=dst;
|
|
const long *s=src;
|
|
|
|
n /= sizeof(*d);
|
|
do { *d++ = *s++; } while (--n);
|
|
|
|
return dst;
|
|
}
|
|
|
|
#elif defined(_MSC_VER)
|
|
/*
|
|
* Unlike GCC these are real functions. In order to minimize impact
|
|
* on performance we adhere to __fastcall calling convention in
|
|
* order to get two first arguments passed through %ecx and %edx.
|
|
* Which kind of suits very well, as instructions in question use
|
|
* both %ecx and %edx as input:-)
|
|
*/
|
|
#define REP_XCRYPT(code) \
|
|
_asm _emit 0xf3 \
|
|
_asm _emit 0x0f _asm _emit 0xa7 \
|
|
_asm _emit code
|
|
|
|
/* BIG FAT WARNING:
|
|
* The offsets used with 'lea' instructions
|
|
* describe items of the 'padlock_cipher_data'
|
|
* structure.
|
|
*/
|
|
#define PADLOCK_XCRYPT_ASM(name,code) \
|
|
static void * __fastcall \
|
|
name (size_t cnt, void *cdata, \
|
|
void *outp, const void *inp) \
|
|
{ _asm mov eax,edx \
|
|
_asm lea edx,[eax+16] \
|
|
_asm lea ebx,[eax+32] \
|
|
_asm mov edi,outp \
|
|
_asm mov esi,inp \
|
|
REP_XCRYPT(code) \
|
|
}
|
|
|
|
PADLOCK_XCRYPT_ASM(padlock_xcrypt_ecb,0xc8)
|
|
PADLOCK_XCRYPT_ASM(padlock_xcrypt_cbc,0xd0)
|
|
PADLOCK_XCRYPT_ASM(padlock_xcrypt_cfb,0xe0)
|
|
PADLOCK_XCRYPT_ASM(padlock_xcrypt_ofb,0xe8)
|
|
|
|
static int __fastcall
|
|
padlock_xstore(void *outp,unsigned int code)
|
|
{ _asm mov edi,ecx
|
|
_asm _emit 0x0f _asm _emit 0xa7 _asm _emit 0xc0
|
|
}
|
|
|
|
static void __fastcall
|
|
padlock_reload_key(void)
|
|
{ _asm pushfd _asm popfd }
|
|
|
|
static void __fastcall
|
|
padlock_verify_context(void *cdata)
|
|
{ _asm {
|
|
pushfd
|
|
bt DWORD PTR[esp],30
|
|
jnc skip
|
|
cmp ecx,padlock_saved_context
|
|
je skip
|
|
popfd
|
|
sub esp,4
|
|
skip: add esp,4
|
|
mov padlock_saved_context,ecx
|
|
}
|
|
}
|
|
|
|
static int
|
|
padlock_available(void)
|
|
{ _asm {
|
|
pushfd
|
|
pop eax
|
|
mov ecx,eax
|
|
xor eax,1<<21
|
|
push eax
|
|
popfd
|
|
pushfd
|
|
pop eax
|
|
xor eax,ecx
|
|
bt eax,21
|
|
jnc noluck
|
|
mov eax,0
|
|
cpuid
|
|
xor eax,eax
|
|
cmp ebx,'tneC'
|
|
jne noluck
|
|
cmp edx,'Hrua'
|
|
jne noluck
|
|
cmp ecx,'slua'
|
|
jne noluck
|
|
mov eax,0xC0000000
|
|
cpuid
|
|
mov edx,eax
|
|
xor eax,eax
|
|
cmp edx,0xC0000001
|
|
jb noluck
|
|
mov eax,0xC0000001
|
|
cpuid
|
|
xor eax,eax
|
|
bt edx,6
|
|
jnc skip_a
|
|
bt edx,7
|
|
jnc skip_a
|
|
mov padlock_use_ace,1
|
|
inc eax
|
|
skip_a: bt edx,2
|
|
jnc skip_r
|
|
bt edx,3
|
|
jnc skip_r
|
|
mov padlock_use_rng,1
|
|
inc eax
|
|
skip_r:
|
|
noluck:
|
|
}
|
|
}
|
|
|
|
static void __fastcall
|
|
padlock_bswapl(void *key)
|
|
{ _asm {
|
|
pushfd
|
|
cld
|
|
mov esi,ecx
|
|
mov edi,ecx
|
|
mov ecx,60
|
|
up: lodsd
|
|
bswap eax
|
|
stosd
|
|
loop up
|
|
popfd
|
|
}
|
|
}
|
|
|
|
/* MS actually specifies status of Direction Flag and compiler even
|
|
* manages to compile following as 'rep movsd' all by itself...
|
|
*/
|
|
#define padlock_memcpy(o,i,n) ((unsigned char *)memcpy((o),(i),(n)&~3U))
|
|
#endif
|
|
|
|
/* ===== AES encryption/decryption ===== */
|
|
#ifndef OPENSSL_NO_AES
|
|
|
|
#if defined(NID_aes_128_cfb128) && ! defined (NID_aes_128_cfb)
|
|
#define NID_aes_128_cfb NID_aes_128_cfb128
|
|
#endif
|
|
|
|
#if defined(NID_aes_128_ofb128) && ! defined (NID_aes_128_ofb)
|
|
#define NID_aes_128_ofb NID_aes_128_ofb128
|
|
#endif
|
|
|
|
#if defined(NID_aes_192_cfb128) && ! defined (NID_aes_192_cfb)
|
|
#define NID_aes_192_cfb NID_aes_192_cfb128
|
|
#endif
|
|
|
|
#if defined(NID_aes_192_ofb128) && ! defined (NID_aes_192_ofb)
|
|
#define NID_aes_192_ofb NID_aes_192_ofb128
|
|
#endif
|
|
|
|
#if defined(NID_aes_256_cfb128) && ! defined (NID_aes_256_cfb)
|
|
#define NID_aes_256_cfb NID_aes_256_cfb128
|
|
#endif
|
|
|
|
#if defined(NID_aes_256_ofb128) && ! defined (NID_aes_256_ofb)
|
|
#define NID_aes_256_ofb NID_aes_256_ofb128
|
|
#endif
|
|
|
|
/* List of supported ciphers. */
|
|
static int padlock_cipher_nids[] = {
|
|
NID_aes_128_ecb,
|
|
NID_aes_128_cbc,
|
|
NID_aes_128_cfb,
|
|
NID_aes_128_ofb,
|
|
|
|
NID_aes_192_ecb,
|
|
NID_aes_192_cbc,
|
|
NID_aes_192_cfb,
|
|
NID_aes_192_ofb,
|
|
|
|
NID_aes_256_ecb,
|
|
NID_aes_256_cbc,
|
|
NID_aes_256_cfb,
|
|
NID_aes_256_ofb,
|
|
};
|
|
static int padlock_cipher_nids_num = (sizeof(padlock_cipher_nids)/
|
|
sizeof(padlock_cipher_nids[0]));
|
|
|
|
/* Function prototypes ... */
|
|
static int padlock_aes_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
|
|
const unsigned char *iv, int enc);
|
|
static int padlock_aes_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
|
|
const unsigned char *in, size_t nbytes);
|
|
|
|
#define NEAREST_ALIGNED(ptr) ( (unsigned char *)(ptr) + \
|
|
( (0x10 - ((size_t)(ptr) & 0x0F)) & 0x0F ) )
|
|
#define ALIGNED_CIPHER_DATA(ctx) ((struct padlock_cipher_data *)\
|
|
NEAREST_ALIGNED(ctx->cipher_data))
|
|
|
|
#define EVP_CIPHER_block_size_ECB AES_BLOCK_SIZE
|
|
#define EVP_CIPHER_block_size_CBC AES_BLOCK_SIZE
|
|
#define EVP_CIPHER_block_size_OFB 1
|
|
#define EVP_CIPHER_block_size_CFB 1
|
|
|
|
/* Declaring so many ciphers by hand would be a pain.
|
|
Instead introduce a bit of preprocessor magic :-) */
|
|
#define DECLARE_AES_EVP(ksize,lmode,umode) \
|
|
static const EVP_CIPHER padlock_aes_##ksize##_##lmode = { \
|
|
NID_aes_##ksize##_##lmode, \
|
|
EVP_CIPHER_block_size_##umode, \
|
|
AES_KEY_SIZE_##ksize, \
|
|
AES_BLOCK_SIZE, \
|
|
0 | EVP_CIPH_##umode##_MODE, \
|
|
padlock_aes_init_key, \
|
|
padlock_aes_cipher, \
|
|
NULL, \
|
|
sizeof(struct padlock_cipher_data) + 16, \
|
|
EVP_CIPHER_set_asn1_iv, \
|
|
EVP_CIPHER_get_asn1_iv, \
|
|
NULL, \
|
|
NULL \
|
|
}
|
|
|
|
DECLARE_AES_EVP(128,ecb,ECB);
|
|
DECLARE_AES_EVP(128,cbc,CBC);
|
|
DECLARE_AES_EVP(128,cfb,CFB);
|
|
DECLARE_AES_EVP(128,ofb,OFB);
|
|
|
|
DECLARE_AES_EVP(192,ecb,ECB);
|
|
DECLARE_AES_EVP(192,cbc,CBC);
|
|
DECLARE_AES_EVP(192,cfb,CFB);
|
|
DECLARE_AES_EVP(192,ofb,OFB);
|
|
|
|
DECLARE_AES_EVP(256,ecb,ECB);
|
|
DECLARE_AES_EVP(256,cbc,CBC);
|
|
DECLARE_AES_EVP(256,cfb,CFB);
|
|
DECLARE_AES_EVP(256,ofb,OFB);
|
|
|
|
static int
|
|
padlock_ciphers (ENGINE *e, const EVP_CIPHER **cipher, const int **nids, int nid)
|
|
{
|
|
/* No specific cipher => return a list of supported nids ... */
|
|
if (!cipher) {
|
|
*nids = padlock_cipher_nids;
|
|
return padlock_cipher_nids_num;
|
|
}
|
|
|
|
/* ... or the requested "cipher" otherwise */
|
|
switch (nid) {
|
|
case NID_aes_128_ecb:
|
|
*cipher = &padlock_aes_128_ecb;
|
|
break;
|
|
case NID_aes_128_cbc:
|
|
*cipher = &padlock_aes_128_cbc;
|
|
break;
|
|
case NID_aes_128_cfb:
|
|
*cipher = &padlock_aes_128_cfb;
|
|
break;
|
|
case NID_aes_128_ofb:
|
|
*cipher = &padlock_aes_128_ofb;
|
|
break;
|
|
|
|
case NID_aes_192_ecb:
|
|
*cipher = &padlock_aes_192_ecb;
|
|
break;
|
|
case NID_aes_192_cbc:
|
|
*cipher = &padlock_aes_192_cbc;
|
|
break;
|
|
case NID_aes_192_cfb:
|
|
*cipher = &padlock_aes_192_cfb;
|
|
break;
|
|
case NID_aes_192_ofb:
|
|
*cipher = &padlock_aes_192_ofb;
|
|
break;
|
|
|
|
case NID_aes_256_ecb:
|
|
*cipher = &padlock_aes_256_ecb;
|
|
break;
|
|
case NID_aes_256_cbc:
|
|
*cipher = &padlock_aes_256_cbc;
|
|
break;
|
|
case NID_aes_256_cfb:
|
|
*cipher = &padlock_aes_256_cfb;
|
|
break;
|
|
case NID_aes_256_ofb:
|
|
*cipher = &padlock_aes_256_ofb;
|
|
break;
|
|
|
|
default:
|
|
/* Sorry, we don't support this NID */
|
|
*cipher = NULL;
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* Prepare the encryption key for PadLock usage */
|
|
static int
|
|
padlock_aes_init_key (EVP_CIPHER_CTX *ctx, const unsigned char *key,
|
|
const unsigned char *iv, int enc)
|
|
{
|
|
struct padlock_cipher_data *cdata;
|
|
int key_len = EVP_CIPHER_CTX_key_length(ctx) * 8;
|
|
|
|
if (key==NULL) return 0; /* ERROR */
|
|
|
|
cdata = ALIGNED_CIPHER_DATA(ctx);
|
|
memset(cdata, 0, sizeof(struct padlock_cipher_data));
|
|
|
|
/* Prepare Control word. */
|
|
if (EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_OFB_MODE)
|
|
cdata->cword.b.encdec = 0;
|
|
else
|
|
cdata->cword.b.encdec = (ctx->encrypt == 0);
|
|
cdata->cword.b.rounds = 10 + (key_len - 128) / 32;
|
|
cdata->cword.b.ksize = (key_len - 128) / 64;
|
|
|
|
switch(key_len) {
|
|
case 128:
|
|
/* PadLock can generate an extended key for
|
|
AES128 in hardware */
|
|
memcpy(cdata->ks.rd_key, key, AES_KEY_SIZE_128);
|
|
cdata->cword.b.keygen = 0;
|
|
break;
|
|
|
|
case 192:
|
|
case 256:
|
|
/* Generate an extended AES key in software.
|
|
Needed for AES192/AES256 */
|
|
/* Well, the above applies to Stepping 8 CPUs
|
|
and is listed as hardware errata. They most
|
|
likely will fix it at some point and then
|
|
a check for stepping would be due here. */
|
|
if (EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_CFB_MODE ||
|
|
EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_OFB_MODE ||
|
|
enc)
|
|
AES_set_encrypt_key(key, key_len, &cdata->ks);
|
|
else
|
|
AES_set_decrypt_key(key, key_len, &cdata->ks);
|
|
#ifndef AES_ASM
|
|
/* OpenSSL C functions use byte-swapped extended key. */
|
|
padlock_bswapl(&cdata->ks);
|
|
#endif
|
|
cdata->cword.b.keygen = 1;
|
|
break;
|
|
|
|
default:
|
|
/* ERROR */
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This is done to cover for cases when user reuses the
|
|
* context for new key. The catch is that if we don't do
|
|
* this, padlock_eas_cipher might proceed with old key...
|
|
*/
|
|
padlock_reload_key ();
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Simplified version of padlock_aes_cipher() used when
|
|
* 1) both input and output buffers are at aligned addresses.
|
|
* or when
|
|
* 2) running on a newer CPU that doesn't require aligned buffers.
|
|
*/
|
|
static int
|
|
padlock_aes_cipher_omnivorous(EVP_CIPHER_CTX *ctx, unsigned char *out_arg,
|
|
const unsigned char *in_arg, size_t nbytes)
|
|
{
|
|
struct padlock_cipher_data *cdata;
|
|
void *iv;
|
|
|
|
cdata = ALIGNED_CIPHER_DATA(ctx);
|
|
padlock_verify_context(cdata);
|
|
|
|
switch (EVP_CIPHER_CTX_mode(ctx)) {
|
|
case EVP_CIPH_ECB_MODE:
|
|
padlock_xcrypt_ecb(nbytes/AES_BLOCK_SIZE, cdata, out_arg, in_arg);
|
|
break;
|
|
|
|
case EVP_CIPH_CBC_MODE:
|
|
memcpy(cdata->iv, ctx->iv, AES_BLOCK_SIZE);
|
|
iv = padlock_xcrypt_cbc(nbytes/AES_BLOCK_SIZE, cdata, out_arg, in_arg);
|
|
memcpy(ctx->iv, iv, AES_BLOCK_SIZE);
|
|
break;
|
|
|
|
case EVP_CIPH_CFB_MODE:
|
|
memcpy(cdata->iv, ctx->iv, AES_BLOCK_SIZE);
|
|
iv = padlock_xcrypt_cfb(nbytes/AES_BLOCK_SIZE, cdata, out_arg, in_arg);
|
|
memcpy(ctx->iv, iv, AES_BLOCK_SIZE);
|
|
break;
|
|
|
|
case EVP_CIPH_OFB_MODE:
|
|
memcpy(cdata->iv, ctx->iv, AES_BLOCK_SIZE);
|
|
padlock_xcrypt_ofb(nbytes/AES_BLOCK_SIZE, cdata, out_arg, in_arg);
|
|
memcpy(ctx->iv, cdata->iv, AES_BLOCK_SIZE);
|
|
break;
|
|
|
|
default:
|
|
return 0;
|
|
}
|
|
|
|
memset(cdata->iv, 0, AES_BLOCK_SIZE);
|
|
|
|
return 1;
|
|
}
|
|
|
|
#ifndef PADLOCK_CHUNK
|
|
# define PADLOCK_CHUNK 512 /* Must be a power of 2 larger than 16 */
|
|
#endif
|
|
#if PADLOCK_CHUNK<16 || PADLOCK_CHUNK&(PADLOCK_CHUNK-1)
|
|
# error "insane PADLOCK_CHUNK..."
|
|
#endif
|
|
|
|
/* Re-align the arguments to 16-Bytes boundaries and run the
|
|
encryption function itself. This function is not AES-specific. */
|
|
static int
|
|
padlock_aes_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out_arg,
|
|
const unsigned char *in_arg, size_t nbytes)
|
|
{
|
|
struct padlock_cipher_data *cdata;
|
|
const void *inp;
|
|
unsigned char *out;
|
|
void *iv;
|
|
int inp_misaligned, out_misaligned, realign_in_loop;
|
|
size_t chunk, allocated=0;
|
|
|
|
/* ctx->num is maintained in byte-oriented modes,
|
|
such as CFB and OFB... */
|
|
if ((chunk = ctx->num)) { /* borrow chunk variable */
|
|
unsigned char *ivp=ctx->iv;
|
|
|
|
switch (EVP_CIPHER_CTX_mode(ctx)) {
|
|
case EVP_CIPH_CFB_MODE:
|
|
if (chunk >= AES_BLOCK_SIZE)
|
|
return 0; /* bogus value */
|
|
|
|
if (ctx->encrypt)
|
|
while (chunk<AES_BLOCK_SIZE && nbytes!=0) {
|
|
ivp[chunk] = *(out_arg++) = *(in_arg++) ^ ivp[chunk];
|
|
chunk++, nbytes--;
|
|
}
|
|
else while (chunk<AES_BLOCK_SIZE && nbytes!=0) {
|
|
unsigned char c = *(in_arg++);
|
|
*(out_arg++) = c ^ ivp[chunk];
|
|
ivp[chunk++] = c, nbytes--;
|
|
}
|
|
|
|
ctx->num = chunk%AES_BLOCK_SIZE;
|
|
break;
|
|
case EVP_CIPH_OFB_MODE:
|
|
if (chunk >= AES_BLOCK_SIZE)
|
|
return 0; /* bogus value */
|
|
|
|
while (chunk<AES_BLOCK_SIZE && nbytes!=0) {
|
|
*(out_arg++) = *(in_arg++) ^ ivp[chunk];
|
|
chunk++, nbytes--;
|
|
}
|
|
|
|
ctx->num = chunk%AES_BLOCK_SIZE;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (nbytes == 0)
|
|
return 1;
|
|
#if 0
|
|
if (nbytes % AES_BLOCK_SIZE)
|
|
return 0; /* are we expected to do tail processing? */
|
|
#else
|
|
/* nbytes is always multiple of AES_BLOCK_SIZE in ECB and CBC
|
|
modes and arbitrary value in byte-oriented modes, such as
|
|
CFB and OFB... */
|
|
#endif
|
|
|
|
/* VIA promises CPUs that won't require alignment in the future.
|
|
For now padlock_aes_align_required is initialized to 1 and
|
|
the condition is never met... */
|
|
/* C7 core is capable to manage unaligned input in non-ECB[!]
|
|
mode, but performance penalties appear to be approximately
|
|
same as for software alignment below or ~3x. They promise to
|
|
improve it in the future, but for now we can just as well
|
|
pretend that it can only handle aligned input... */
|
|
if (!padlock_aes_align_required && (nbytes%AES_BLOCK_SIZE)==0)
|
|
return padlock_aes_cipher_omnivorous(ctx, out_arg, in_arg, nbytes);
|
|
|
|
inp_misaligned = (((size_t)in_arg) & 0x0F);
|
|
out_misaligned = (((size_t)out_arg) & 0x0F);
|
|
|
|
/* Note that even if output is aligned and input not,
|
|
* I still prefer to loop instead of copy the whole
|
|
* input and then encrypt in one stroke. This is done
|
|
* in order to improve L1 cache utilization... */
|
|
realign_in_loop = out_misaligned|inp_misaligned;
|
|
|
|
if (!realign_in_loop && (nbytes%AES_BLOCK_SIZE)==0)
|
|
return padlock_aes_cipher_omnivorous(ctx, out_arg, in_arg, nbytes);
|
|
|
|
/* this takes one "if" out of the loops */
|
|
chunk = nbytes;
|
|
chunk %= PADLOCK_CHUNK;
|
|
if (chunk==0) chunk = PADLOCK_CHUNK;
|
|
|
|
if (out_misaligned) {
|
|
/* optmize for small input */
|
|
allocated = (chunk<nbytes?PADLOCK_CHUNK:nbytes);
|
|
out = alloca(0x10 + allocated);
|
|
out = NEAREST_ALIGNED(out);
|
|
}
|
|
else
|
|
out = out_arg;
|
|
|
|
cdata = ALIGNED_CIPHER_DATA(ctx);
|
|
padlock_verify_context(cdata);
|
|
|
|
switch (EVP_CIPHER_CTX_mode(ctx)) {
|
|
case EVP_CIPH_ECB_MODE:
|
|
do {
|
|
if (inp_misaligned)
|
|
inp = padlock_memcpy(out, in_arg, chunk);
|
|
else
|
|
inp = in_arg;
|
|
in_arg += chunk;
|
|
|
|
padlock_xcrypt_ecb(chunk/AES_BLOCK_SIZE, cdata, out, inp);
|
|
|
|
if (out_misaligned)
|
|
out_arg = padlock_memcpy(out_arg, out, chunk) + chunk;
|
|
else
|
|
out = out_arg+=chunk;
|
|
|
|
nbytes -= chunk;
|
|
chunk = PADLOCK_CHUNK;
|
|
} while (nbytes);
|
|
break;
|
|
|
|
case EVP_CIPH_CBC_MODE:
|
|
memcpy(cdata->iv, ctx->iv, AES_BLOCK_SIZE);
|
|
goto cbc_shortcut;
|
|
do {
|
|
if (iv != cdata->iv)
|
|
memcpy(cdata->iv, iv, AES_BLOCK_SIZE);
|
|
chunk = PADLOCK_CHUNK;
|
|
cbc_shortcut: /* optimize for small input */
|
|
if (inp_misaligned)
|
|
inp = padlock_memcpy(out, in_arg, chunk);
|
|
else
|
|
inp = in_arg;
|
|
in_arg += chunk;
|
|
|
|
iv = padlock_xcrypt_cbc(chunk/AES_BLOCK_SIZE, cdata, out, inp);
|
|
|
|
if (out_misaligned)
|
|
out_arg = padlock_memcpy(out_arg, out, chunk) + chunk;
|
|
else
|
|
out = out_arg+=chunk;
|
|
|
|
} while (nbytes -= chunk);
|
|
memcpy(ctx->iv, iv, AES_BLOCK_SIZE);
|
|
break;
|
|
|
|
case EVP_CIPH_CFB_MODE:
|
|
memcpy (iv = cdata->iv, ctx->iv, AES_BLOCK_SIZE);
|
|
chunk &= ~(AES_BLOCK_SIZE-1);
|
|
if (chunk) goto cfb_shortcut;
|
|
else goto cfb_skiploop;
|
|
do {
|
|
if (iv != cdata->iv)
|
|
memcpy(cdata->iv, iv, AES_BLOCK_SIZE);
|
|
chunk = PADLOCK_CHUNK;
|
|
cfb_shortcut: /* optimize for small input */
|
|
if (inp_misaligned)
|
|
inp = padlock_memcpy(out, in_arg, chunk);
|
|
else
|
|
inp = in_arg;
|
|
in_arg += chunk;
|
|
|
|
iv = padlock_xcrypt_cfb(chunk/AES_BLOCK_SIZE, cdata, out, inp);
|
|
|
|
if (out_misaligned)
|
|
out_arg = padlock_memcpy(out_arg, out, chunk) + chunk;
|
|
else
|
|
out = out_arg+=chunk;
|
|
|
|
nbytes -= chunk;
|
|
} while (nbytes >= AES_BLOCK_SIZE);
|
|
|
|
cfb_skiploop:
|
|
if (nbytes) {
|
|
unsigned char *ivp = cdata->iv;
|
|
|
|
if (iv != ivp) {
|
|
memcpy(ivp, iv, AES_BLOCK_SIZE);
|
|
iv = ivp;
|
|
}
|
|
ctx->num = nbytes;
|
|
if (cdata->cword.b.encdec) {
|
|
cdata->cword.b.encdec=0;
|
|
padlock_reload_key();
|
|
padlock_xcrypt_ecb(1,cdata,ivp,ivp);
|
|
cdata->cword.b.encdec=1;
|
|
padlock_reload_key();
|
|
while(nbytes) {
|
|
unsigned char c = *(in_arg++);
|
|
*(out_arg++) = c ^ *ivp;
|
|
*(ivp++) = c, nbytes--;
|
|
}
|
|
}
|
|
else { padlock_reload_key();
|
|
padlock_xcrypt_ecb(1,cdata,ivp,ivp);
|
|
padlock_reload_key();
|
|
while (nbytes) {
|
|
*ivp = *(out_arg++) = *(in_arg++) ^ *ivp;
|
|
ivp++, nbytes--;
|
|
}
|
|
}
|
|
}
|
|
|
|
memcpy(ctx->iv, iv, AES_BLOCK_SIZE);
|
|
break;
|
|
|
|
case EVP_CIPH_OFB_MODE:
|
|
memcpy(cdata->iv, ctx->iv, AES_BLOCK_SIZE);
|
|
chunk &= ~(AES_BLOCK_SIZE-1);
|
|
if (chunk) do {
|
|
if (inp_misaligned)
|
|
inp = padlock_memcpy(out, in_arg, chunk);
|
|
else
|
|
inp = in_arg;
|
|
in_arg += chunk;
|
|
|
|
padlock_xcrypt_ofb(chunk/AES_BLOCK_SIZE, cdata, out, inp);
|
|
|
|
if (out_misaligned)
|
|
out_arg = padlock_memcpy(out_arg, out, chunk) + chunk;
|
|
else
|
|
out = out_arg+=chunk;
|
|
|
|
nbytes -= chunk;
|
|
chunk = PADLOCK_CHUNK;
|
|
} while (nbytes >= AES_BLOCK_SIZE);
|
|
|
|
if (nbytes) {
|
|
unsigned char *ivp = cdata->iv;
|
|
|
|
ctx->num = nbytes;
|
|
padlock_reload_key(); /* empirically found */
|
|
padlock_xcrypt_ecb(1,cdata,ivp,ivp);
|
|
padlock_reload_key(); /* empirically found */
|
|
while (nbytes) {
|
|
*(out_arg++) = *(in_arg++) ^ *ivp;
|
|
ivp++, nbytes--;
|
|
}
|
|
}
|
|
|
|
memcpy(ctx->iv, cdata->iv, AES_BLOCK_SIZE);
|
|
break;
|
|
|
|
default:
|
|
return 0;
|
|
}
|
|
|
|
/* Clean the realign buffer if it was used */
|
|
if (out_misaligned) {
|
|
volatile unsigned long *p=(void *)out;
|
|
size_t n = allocated/sizeof(*p);
|
|
while (n--) *p++=0;
|
|
}
|
|
|
|
memset(cdata->iv, 0, AES_BLOCK_SIZE);
|
|
|
|
return 1;
|
|
}
|
|
|
|
#endif /* OPENSSL_NO_AES */
|
|
|
|
/* ===== Random Number Generator ===== */
|
|
/*
|
|
* This code is not engaged. The reason is that it does not comply
|
|
* with recommendations for VIA RNG usage for secure applications
|
|
* (posted at http://www.via.com.tw/en/viac3/c3.jsp) nor does it
|
|
* provide meaningful error control...
|
|
*/
|
|
/* Wrapper that provides an interface between the API and
|
|
the raw PadLock RNG */
|
|
static int
|
|
padlock_rand_bytes(unsigned char *output, int count)
|
|
{
|
|
unsigned int eax, buf;
|
|
|
|
while (count >= 8) {
|
|
eax = padlock_xstore(output, 0);
|
|
if (!(eax&(1<<6))) return 0; /* RNG disabled */
|
|
/* this ---vv--- covers DC bias, Raw Bits and String Filter */
|
|
if (eax&(0x1F<<10)) return 0;
|
|
if ((eax&0x1F)==0) continue; /* no data, retry... */
|
|
if ((eax&0x1F)!=8) return 0; /* fatal failure... */
|
|
output += 8;
|
|
count -= 8;
|
|
}
|
|
while (count > 0) {
|
|
eax = padlock_xstore(&buf, 3);
|
|
if (!(eax&(1<<6))) return 0; /* RNG disabled */
|
|
/* this ---vv--- covers DC bias, Raw Bits and String Filter */
|
|
if (eax&(0x1F<<10)) return 0;
|
|
if ((eax&0x1F)==0) continue; /* no data, retry... */
|
|
if ((eax&0x1F)!=1) return 0; /* fatal failure... */
|
|
*output++ = (unsigned char)buf;
|
|
count--;
|
|
}
|
|
*(volatile unsigned int *)&buf=0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* Dummy but necessary function */
|
|
static int
|
|
padlock_rand_status(void)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
/* Prepare structure for registration */
|
|
static RAND_METHOD padlock_rand = {
|
|
NULL, /* seed */
|
|
padlock_rand_bytes, /* bytes */
|
|
NULL, /* cleanup */
|
|
NULL, /* add */
|
|
padlock_rand_bytes, /* pseudorand */
|
|
padlock_rand_status, /* rand status */
|
|
};
|
|
|
|
#else /* !COMPILE_HW_PADLOCK */
|
|
#ifndef OPENSSL_NO_DYNAMIC_ENGINE
|
|
OPENSSL_EXPORT
|
|
int bind_engine(ENGINE *e, const char *id, const dynamic_fns *fns);
|
|
OPENSSL_EXPORT
|
|
int bind_engine(ENGINE *e, const char *id, const dynamic_fns *fns) { return 0; }
|
|
IMPLEMENT_DYNAMIC_CHECK_FN()
|
|
#endif
|
|
#endif /* COMPILE_HW_PADLOCK */
|
|
|
|
#endif /* !OPENSSL_NO_HW_PADLOCK */
|
|
#endif /* !OPENSSL_NO_HW */
|