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/* LibTomCrypt, modular cryptographic library -- Tom St Denis
*
* LibTomCrypt is a library that provides various cryptographic
* algorithms in a highly modular and flexible manner.
*
* The library is free for all purposes without any express
* guarantee it works.
*/
#include "tomcrypt.h"
/**
@file no_prng.c
NO PRNG, Steffen Jaeckel
*/
#ifdef LTC_PKCS_1
typedef struct
{
struct ltc_prng_descriptor desc;
char name[64];
unsigned char entropy[1024];
unsigned long len;
unsigned long offset;
} no_prng_desc_t;
/**
Start the PRNG
@param prng [out] The PRNG state to initialize
@return CRYPT_OK if successful
*/
int no_prng_start(prng_state *prng)
{
no_prng_desc_t *no_prng = (no_prng_desc_t*) prng;
LTC_ARGCHK(no_prng != NULL);
LTC_ARGCHK(no_prng->name == (char*)no_prng + offsetof(no_prng_desc_t, name));
no_prng->len = 0;
no_prng->offset = 0;
return CRYPT_OK;
}
/**
Add entropy to the PRNG state
@param in The data to add
@param inlen Length of the data to add
@param prng PRNG state to update
@return CRYPT_OK if successful
*/
int no_prng_add_entropy(const unsigned char *in, unsigned long inlen, prng_state *prng)
{
no_prng_desc_t *no_prng = (no_prng_desc_t*) prng;
LTC_ARGCHK(no_prng != NULL);
LTC_ARGCHK(no_prng->name == (char*)no_prng + offsetof(no_prng_desc_t, name));
LTC_ARGCHK(in != NULL);
LTC_ARGCHK(inlen <= sizeof(no_prng->entropy));
no_prng->len = MIN(inlen, sizeof(no_prng->entropy));
memcpy(no_prng->entropy, in, no_prng->len);
no_prng->offset = 0;
return CRYPT_OK;
}
/**
Make the PRNG ready to read from
@param prng The PRNG to make active
@return CRYPT_OK if successful
*/
int no_prng_ready(prng_state *prng)
{
LTC_ARGCHK(prng != NULL);
return CRYPT_OK;
}
/**
Read from the PRNG
@param out Destination
@param outlen Length of output
@param prng The active PRNG to read from
@return Number of octets read
*/
unsigned long no_prng_read(unsigned char *out, unsigned long outlen, prng_state *prng)
{
no_prng_desc_t *no_prng = (no_prng_desc_t*) prng;
LTC_ARGCHK(no_prng != NULL);
LTC_ARGCHK(no_prng->name == (char*)no_prng + offsetof(no_prng_desc_t, name));
LTC_ARGCHK(out != NULL);
outlen = MIN(outlen, no_prng->len - no_prng->offset);
memcpy(out, &no_prng->entropy[no_prng->offset], outlen);
no_prng->offset += outlen;
return outlen;
}
/**
Terminate the PRNG
@param prng The PRNG to terminate
@return CRYPT_OK if successful
*/
int no_prng_done(prng_state *prng)
{
LTC_UNUSED_PARAM(prng);
return CRYPT_OK;
}
/**
Export the PRNG state
@param out [out] Destination
@param outlen [in/out] Max size and resulting size of the state
@param prng The PRNG to export
@return CRYPT_OK if successful
*/
int no_prng_export(unsigned char *out, unsigned long *outlen, prng_state *prng)
{
LTC_UNUSED_PARAM(out);
LTC_UNUSED_PARAM(outlen);
LTC_UNUSED_PARAM(prng);
return CRYPT_OK;
}
/**
Import a PRNG state
@param in The PRNG state
@param inlen Size of the state
@param prng The PRNG to import
@return CRYPT_OK if successful
*/
int no_prng_import(const unsigned char *in, unsigned long inlen, prng_state *prng)
{
LTC_UNUSED_PARAM(in);
LTC_UNUSED_PARAM(inlen);
LTC_UNUSED_PARAM(prng);
return CRYPT_OK;
}
/**
PRNG self-test
@return CRYPT_OK if successful, CRYPT_NOP if self-testing has been disabled
*/
int no_prng_test(void)
{
return CRYPT_OK;
}
static const struct ltc_prng_descriptor no_prng_desc =
{
NULL, 0,
&no_prng_start,
&no_prng_add_entropy,
&no_prng_ready,
&no_prng_read,
&no_prng_done,
&no_prng_export,
&no_prng_import,
&no_prng_test
};
struct ltc_prng_descriptor* no_prng_desc_get(void)
{
no_prng_desc_t* no_prng = XMALLOC(sizeof(*no_prng));
LTC_ARGCHK(no_prng != NULL);
XMEMCPY(&no_prng->desc, &no_prng_desc, sizeof(no_prng_desc));
LTC_ARGCHK(snprintf(no_prng->name, sizeof(no_prng->name), "no_prng@%p", no_prng) < (int)sizeof(no_prng->name));
no_prng->desc.name = no_prng->name;
return &no_prng->desc;
}
void no_prng_desc_free(struct ltc_prng_descriptor* prng)
{
no_prng_desc_t *no_prng = (no_prng_desc_t*) prng;
LTC_ARGCHK(no_prng != NULL);
LTC_ARGCHK(no_prng->name == (char*)no_prng + offsetof(no_prng_desc_t, name));
XFREE(no_prng);
}
#endif
/* ref: $Format:%D$ */
/* git commit: $Format:%H$ */
/* commit time: $Format:%ai$ */
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