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#include "internal/cryptlib.h"
#include <openssl/rand.h>
#include <openssl/sha.h>
#include "crypto/rand_pool.h"
#include "crypto/rand.h"
#include "prov/seeding.h"
#if defined(OPENSSL_SYS_AMIGAOS3) || defined(OPENSSL_SYS_AMIGAOS4)
# ifndef OPENSSL_RAND_SEED_OS
# error "Unsupported seeding method configured; must be os"
# endif
#define __USE_INLINE__ 1
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
#include <proto/exec.h>
#include <proto/timer.h>
#include <devices/timer.h>
/* Maximum number of attempts to get a delay of 1 microsecond that is not equal to 0 */
#define MAX_ATTEMPTS 1000
#ifdef __amigaos4__
#ifdef CreateMsgPort
#undef CreateMsgPort
#endif
#define CreateMsgPort() AllocSysObject(ASOT_PORT,NULL)
#ifdef DeleteMsgPort
#undef DeleteMsgPort
#endif
#define DeleteMsgPort(msgPort) FreeSysObject(ASOT_PORT,msgPort)
#ifdef CreateIORequest
#undef CreateIORequest
#endif
#define CreateIORequest(ioReplyPort,size) AllocSysObjectTags(ASOT_IOREQUEST,ASOIOR_ReplyPort,ioReplyPort,ASOIOR_Size,size,TAG_DONE)
#ifdef DeleteIORequest
#undef DeleteIORequest
#endif
#define DeleteIORequest(ioReq) FreeSysObject(ASOT_IOREQUEST,ioReq)
#else
#define GetInterface(a, b, c, d) 1
#define DropInterface(x)
/* OS3 has a different but compatible TimeVal definition */
struct TimeVal
{
ULONG Seconds;
ULONG Microseconds;
};
/* ... and ditto for TimeRequest */
struct TimeRequest
{
struct IORequest Request;
struct TimeVal Time;
};
#endif /* !__amigaos4__ */
size_t ossl_pool_acquire_entropy(RAND_POOL *pool)
{
unsigned char temp_buffer[SHA_DIGEST_LENGTH], data_buffer[SHA_DIGEST_LENGTH];
struct MsgPort *port = NULL;
size_t bytes_needed;
size_t entropy_available = 0;
struct TimeRequest *time_request = NULL;
#ifdef __amigaos4__
struct IOStdReq *entropy_request = NULL;
bytes_needed = ossl_rand_pool_bytes_needed(pool, 1);
if ((port = CreateMsgPort())
&& (entropy_request = (struct IOStdReq *)CreateIORequest(port, sizeof(*entropy_request))))
{
if (OpenDevice(TIMERNAME, UNIT_ENTROPY, (struct IORequest *)entropy_request, 0) == 0)
{
while(bytes_needed > 0)
{
entropy_request->io_Command = TR_READENTROPY;
entropy_request->io_Data = &temp_buffer[0];
entropy_request->io_Length = sizeof(temp_buffer);
if (DoIO((struct IORequest *)entropy_request) == 0)
{
unsigned char *buffer;
size_t bytes = (bytes_needed < sizeof(data_buffer) ? bytes_needed : sizeof(data_buffer));
buffer = ossl_rand_pool_add_begin(pool, bytes_needed);
SHA1(&temp_buffer[0], sizeof(temp_buffer), &data_buffer[0]);
memcpy(buffer, data_buffer, bytes);
ossl_rand_pool_add_end(pool, bytes, 8 * bytes);
bytes_needed -= bytes;
}
else
break;
}
CloseDevice((struct IORequest *)entropy_request);
}
}
DeleteIORequest((struct IORequest *)entropy_request);
entropy_available = ossl_rand_pool_entropy_available(pool);
if (entropy_available > 0)
return entropy_available;
#endif /* __amigaos4__ */
/* The following block will be used on "classic" machines. It does not generate
* a high degree of randomness, but it does the job since RAND_poll is
* called only once by OpenSSL to generate a 32 byte seed.
*/
bytes_needed = ossl_rand_pool_bytes_needed(pool, 1);
if (bytes_needed > 0
&& (port || (port = CreateMsgPort()))
&& (time_request = (struct TimeRequest *)CreateIORequest(port, sizeof(*time_request))))
{
if (OpenDevice(TIMERNAME, UNIT_VBLANK, (struct IORequest *)time_request, 0) == 0)
{
#if defined(__amigaos4__)
struct TimerIFace *ITimer = NULL;
#endif
struct Device *TimerBase;
if ((TimerBase = time_request->Request.io_Device)
#if defined(__amigaos4__)
&& (ITimer = (struct TimerIFace *)GetInterface((struct Library *)TimerBase, "main", 1, NULL))
#endif
)
{
struct EClockVal curr_eclock;
ULONG prev_ev_lo = 0;
struct TimeVal tv;
int i, attempt;
BOOL aborted;
ReadEClock(&curr_eclock);
aborted = FALSE;
while(!aborted && bytes_needed > 0)
{
for(i = 0;
!aborted && i < (int)sizeof(temp_buffer) - (int)sizeof(ULONG);
i++)
{
attempt = 0;
/* Ask for a one microsecond delay and measure the time
* the delay actually took.
*/
do
{
time_request->Request.io_Command = TR_ADDREQUEST;
time_request->Time.Seconds = 0;
time_request->Time.Microseconds = 1;
if (DoIO((struct IORequest *)time_request) == 0)
{
prev_ev_lo = curr_eclock.ev_lo;
ReadEClock(&curr_eclock);
attempt++;
}
else
aborted = TRUE;
} while(!aborted && prev_ev_lo == 0 && attempt < MAX_ATTEMPTS);
if (attempt >= MAX_ATTEMPTS)
aborted = TRUE;
/* Since we are going for randomness, ev_hi is irrelevant */
temp_buffer[i] = (unsigned char)(curr_eclock.ev_lo - prev_ev_lo);
}
GetSysTime(&tv);
if (sizeof(temp_buffer) > sizeof(ULONG))
*(ULONG *)&temp_buffer[sizeof(temp_buffer) - sizeof(ULONG)]
= tv.Microseconds;
/* Shuffle the bits around and specify that about
* one fourth of it adds to the entropy.
*/
if (!aborted)
{
unsigned char *buffer;
size_t bytes = (bytes_needed < sizeof(data_buffer) ? bytes_needed : sizeof(data_buffer));
SHA1(&temp_buffer[0], sizeof(temp_buffer), &data_buffer[0]);
ossl_rand_pool_add_end(pool, bytes, (sizeof(data_buffer) / 4) * 8);
bytes_needed -= bytes;
}
}
}
#if defined(__amigaos4__)
DropInterface((struct Interface *)ITimer);
#endif
CloseDevice((struct IORequest *)time_request);
}
}
DeleteIORequest((struct IORequest *)time_request);
DeleteMsgPort(port);
return ossl_rand_pool_entropy_available(pool);
}
int ossl_pool_add_nonce_data(RAND_POOL *pool)
{
struct {
pid_t pid;
CRYPTO_THREAD_ID tid;
uint64_t time;
} data;
/* Erase the entire structure including any padding */
memset(&data, 0, sizeof(data));
/*
* Add process id, thread id, and a high resolution timestamp to
* ensure that the nonce is unique with high probability for
* different process instances.
*/
data.pid = getpid();
data.tid = CRYPTO_THREAD_get_current_id();
/*XXX: can this be improved? */
data.time = time(NULL);
return ossl_rand_pool_add(pool, (unsigned char *)&data, sizeof(data), 0);
}
int ossl_rand_pool_add_additional_data(RAND_POOL *pool)
{
struct {
int fork_id;
CRYPTO_THREAD_ID tid;
uint64_t time;
} data;
/* Erase the entire structure including any padding */
memset(&data, 0, sizeof(data));
/*
* Add some noise from the thread id and a high resolution timer.
* The fork_id adds some extra fork-safety.
* The thread id adds a little randomness if the drbg is accessed
* concurrently (which is the case for the <master> drbg).
*/
data.fork_id = openssl_get_fork_id();
data.tid = CRYPTO_THREAD_get_current_id();
/*XXX: can this be improved? */
data.time = (uint64_t) time(NULL);
return ossl_rand_pool_add(pool, (unsigned char *)&data, sizeof(data), 0);
}
int ossl_rand_pool_init(void)
{
return 1;
}
void ossl_rand_pool_cleanup(void)
{
}
void ossl_rand_pool_keep_random_devices_open(int keep)
{
}
#endif /* OPENSSL_SYS_AMIGA */
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