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- #if defined(__linux__)
- #define _GNU_SOURCE
- #endif
- #if !defined(MBEDTLS_CONFIG_FILE)
- #include "mbedtls/config.h"
- #else
- #include MBEDTLS_CONFIG_FILE
- #endif
- #include <string.h>
- #if defined(MBEDTLS_ENTROPY_C)
- #include "mbedtls/entropy.h"
- #include "mbedtls/entropy_poll.h"
- #if defined(MBEDTLS_TIMING_C)
- #include "mbedtls/timing.h"
- #endif
- #if defined(MBEDTLS_HAVEGE_C)
- #include "mbedtls/havege.h"
- #endif
- #if defined(MBEDTLS_ENTROPY_NV_SEED)
- #include "mbedtls/platform.h"
- #endif
- #if !defined(MBEDTLS_NO_PLATFORM_ENTROPY)
- #if !defined(unix) && !defined(__unix__) && !defined(__unix) && \
- !defined(__APPLE__) && !defined(_WIN32) && !defined(__QNXNTO__) && \
- !defined(__HAIKU__)
- #error "Platform entropy sources only work on Unix and Windows, see MBEDTLS_NO_PLATFORM_ENTROPY in config.h"
- #endif
- #if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
- #if !defined(_WIN32_WINNT)
- #define _WIN32_WINNT 0x0400
- #endif
- #include <windows.h>
- #include <wincrypt.h>
- int mbedtls_platform_entropy_poll( void *data, unsigned char *output, size_t len,
- size_t *olen )
- {
- HCRYPTPROV provider;
- ((void) data);
- *olen = 0;
- if( CryptAcquireContext( &provider, NULL, NULL,
- PROV_RSA_FULL, CRYPT_VERIFYCONTEXT ) == FALSE )
- {
- return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
- }
- if( CryptGenRandom( provider, (DWORD) len, output ) == FALSE )
- {
- CryptReleaseContext( provider, 0 );
- return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
- }
- CryptReleaseContext( provider, 0 );
- *olen = len;
- return( 0 );
- }
- #else
- #if defined(__linux__) && defined(__GLIBC__)
- #include <unistd.h>
- #include <sys/syscall.h>
- #if defined(SYS_getrandom)
- #define HAVE_GETRANDOM
- #include <errno.h>
- static int getrandom_wrapper( void *buf, size_t buflen, unsigned int flags )
- {
-
- #if defined(__has_feature)
- #if __has_feature(memory_sanitizer)
- memset( buf, 0, buflen );
- #endif
- #endif
- return( syscall( SYS_getrandom, buf, buflen, flags ) );
- }
- #endif
- #endif
- #include <stdio.h>
- int mbedtls_platform_entropy_poll( void *data,
- unsigned char *output, size_t len, size_t *olen )
- {
- FILE *file;
- size_t read_len;
- int ret;
- ((void) data);
- #if defined(HAVE_GETRANDOM)
- ret = getrandom_wrapper( output, len, 0 );
- if( ret >= 0 )
- {
- *olen = ret;
- return( 0 );
- }
- else if( errno != ENOSYS )
- return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
-
- #else
- ((void) ret);
- #endif
- *olen = 0;
- file = fopen( "/dev/urandom", "rb" );
- if( file == NULL )
- return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
- read_len = fread( output, 1, len, file );
- if( read_len != len )
- {
- fclose( file );
- return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
- }
- fclose( file );
- *olen = len;
- return( 0 );
- }
- #endif
- #endif
- #if defined(MBEDTLS_TEST_NULL_ENTROPY)
- int mbedtls_null_entropy_poll( void *data,
- unsigned char *output, size_t len, size_t *olen )
- {
- ((void) data);
- ((void) output);
- *olen = 0;
- if( len < sizeof(unsigned char) )
- return( 0 );
- *olen = sizeof(unsigned char);
- return( 0 );
- }
- #endif
- #if defined(MBEDTLS_TIMING_C)
- int mbedtls_hardclock_poll( void *data,
- unsigned char *output, size_t len, size_t *olen )
- {
- unsigned long timer = mbedtls_timing_hardclock();
- ((void) data);
- *olen = 0;
- if( len < sizeof(unsigned long) )
- return( 0 );
- memcpy( output, &timer, sizeof(unsigned long) );
- *olen = sizeof(unsigned long);
- return( 0 );
- }
- #endif
- #if defined(MBEDTLS_HAVEGE_C)
- int mbedtls_havege_poll( void *data,
- unsigned char *output, size_t len, size_t *olen )
- {
- mbedtls_havege_state *hs = (mbedtls_havege_state *) data;
- *olen = 0;
- if( mbedtls_havege_random( hs, output, len ) != 0 )
- return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
- *olen = len;
- return( 0 );
- }
- #endif
- #if defined(MBEDTLS_ENTROPY_NV_SEED)
- int mbedtls_nv_seed_poll( void *data,
- unsigned char *output, size_t len, size_t *olen )
- {
- unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE];
- size_t use_len = MBEDTLS_ENTROPY_BLOCK_SIZE;
- ((void) data);
- memset( buf, 0, MBEDTLS_ENTROPY_BLOCK_SIZE );
- if( mbedtls_nv_seed_read( buf, MBEDTLS_ENTROPY_BLOCK_SIZE ) < 0 )
- return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
- if( len < use_len )
- use_len = len;
- memcpy( output, buf, use_len );
- *olen = use_len;
- return( 0 );
- }
- #endif
- #endif
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