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tc_ctr_prng_reseed() function
CTR-PRNG reseed procedure Mixes entropy and additional_input into the prng context
Syntax
int tc_ctr_prng_reseed(TCCtrPrng_t * const ctx,
uint8_t const * const entropy,
unsigned int entropyLen,
uint8_t const * const additional_input,
unsigned int additionallen);
Implemented in ![]()
ctr_prng.c:164
Return value
returns TC_CRYPTO_SUCCESS (1) returns TC_CRYPTO_FAIL (0) if: ctx == NULL, entropy == NULL, entropylen < (TC_AES_KEY_SIZE + TC_AES_BLOCK_SIZE)
Notes
It is better to reseed an existing prng context rather than re-initialise, so that any existing entropy in the context is presereved. This offers some protection against undetected failures of the entropy source. Assumes tc_ctr_prng_init has been called for ctx
Related Functions
Found 5 other functions taking a ![]()
TCCtrPrng_t
argument:
Function
Description
CTR PRNG update Updates the internal state of supplied the CTR PRNG context increments it by one
CTR PRNG update Updates the internal state of supplied the CTR PRNG context increments it by one
CTR-PRNG initialization procedure Initializes prng context with entropy and personalization string (if any)
CTR-PRNG generate procedure Generates outlen pseudo-random bytes into out buffer, updates prng
CTR-PRNG uninstantiate procedure Zeroes the internal state of the supplied prng context