174 lines
3.8 KiB
Text
174 lines
3.8 KiB
Text
int unhexify(unsigned char *obuf, const char *ibuf)
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{
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unsigned char c, c2;
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int len = strlen(ibuf) / 2;
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assert(!(strlen(ibuf) %1)); // must be even number of bytes
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while (*ibuf != 0)
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{
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c = *ibuf++;
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if( c >= '0' && c <= '9' )
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c -= '0';
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else if( c >= 'a' && c <= 'f' )
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c -= 'a' - 10;
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else if( c >= 'A' && c <= 'F' )
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c -= 'A' - 10;
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else
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assert( 0 );
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c2 = *ibuf++;
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if( c2 >= '0' && c2 <= '9' )
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c2 -= '0';
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else if( c2 >= 'a' && c2 <= 'f' )
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c2 -= 'a' - 10;
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else if( c2 >= 'A' && c2 <= 'F' )
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c2 -= 'A' - 10;
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else
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assert( 0 );
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*obuf++ = ( c << 4 ) | c2;
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}
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return len;
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}
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void hexify(unsigned char *obuf, const unsigned char *ibuf, int len)
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{
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unsigned char l, h;
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while (len != 0)
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{
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h = (*ibuf) / 16;
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l = (*ibuf) % 16;
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if( h < 10 )
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*obuf++ = '0' + h;
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else
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*obuf++ = 'a' + h - 10;
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if( l < 10 )
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*obuf++ = '0' + l;
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else
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*obuf++ = 'a' + l - 10;
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++ibuf;
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len--;
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}
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}
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/**
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* This function just returns data from rand().
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* Although predictable and often similar on multiple
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* runs, this does not result in identical random on
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* each run. So do not use this if the results of a
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* test depend on the random data that is generated.
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*
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* rng_state shall be NULL.
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*/
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static int rnd_std_rand( void *rng_state )
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{
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if( rng_state != NULL )
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rng_state = NULL;
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return( rand() );
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}
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/**
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* This function only returns zeros
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*
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* rng_state shall be NULL.
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*/
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static int rnd_zero_rand( void *rng_state )
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{
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if( rng_state != NULL )
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rng_state = NULL;
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return( 0 );
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}
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typedef struct
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{
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unsigned char *buf;
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int length;
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int per_call;
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} rnd_buf_info;
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/**
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* This function returns random based on a buffer it receives.
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*
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* rng_state shall be a pointer to a rnd_buf_info structure.
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*
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* The number of bytes released from the buffer on each call to
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* the random function is specified by per_call. (Can be between
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* 1 and 4)
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*
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* After the buffer is empty it will return rand();
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*/
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static int rnd_buffer_rand( void *rng_state )
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{
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rnd_buf_info *info = (rnd_buf_info *) rng_state;
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int res;
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if( rng_state == NULL )
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return( rand() );
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if( info->per_call > 4 )
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info->per_call = 4;
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else if( info->per_call < 1 )
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info->per_call = 1;
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res = rand();
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if( info->length >= info->per_call )
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{
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memcpy( &res, info->buf, info->per_call );
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info->buf += info->per_call;
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info->length -= info->per_call;
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}
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else if( info->length > 0 )
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{
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memcpy( &res, info->buf, info->length );
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info->length = 0;
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}
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return( res );
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}
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/**
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* Info structure for the pseudo random function
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*
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* Key should be set at the start to a test-unique value.
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* State( v0, v1 ) should be set to zero.
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*/
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typedef struct
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{
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unsigned char key[16];
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uint32_t v0, v1;
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} rnd_pseudo_info;
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/**
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* This function returns random based on a pseudo random function.
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* This means the results should be identical on all systems.
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* Pseudo random is based on the XTEA encryption algorithm to
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* generate pseudorandom.
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*
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* rng_state shall be a pointer to a rnd_pseudo_info structure.
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*/
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static int rnd_pseudo_rand( void *rng_state )
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{
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rnd_pseudo_info *info = (rnd_pseudo_info *) rng_state;
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uint32_t i, *k, sum, delta=0x9E3779B9;
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if( rng_state == NULL )
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return( rand() );
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k = (uint32_t *) info->key;
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for( i = 0; i < 32; i++ )
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{
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info->v0 += (((info->v1 << 4) ^ (info->v1 >> 5)) + info->v1) ^ (sum + k[sum & 3]);
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sum += delta;
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info->v1 += (((info->v0 << 4) ^ (info->v0 >> 5)) + info->v0) ^ (sum + k[(sum>>11) & 3]);
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}
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return( info->v0 );
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}
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