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mbedtls_ctr_drbg_seed() function
- The \p custom string. In addition, if you do not pass a nonce in \p custom, the sum of the entropy length and the entropy nonce length must be: - at least 24 bytes for a 128-bit strength (maximum achievable strength when using AES-128); - at least 48 bytes for a 256-bit strength (maximum achievable strength when using AES-256).
Syntax
Implemented in ![]()
ctr_drbg.c:435
Return value
\c 0 on success. #MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED on failure.
Notes
To achieve the nominal security strength permitted by CTR_DRBG, the entropy length must be: - at least 16 bytes for a 128-bit strength (maximum achievable strength when using AES-128); - at least 32 bytes for a 256-bit strength (maximum achievable strength when using AES-256).
Related Functions
Found 14 other functions taking a ![]()
mbedtls_ctr_drbg_context
argument:
Function
Description
This function initializes the CTR_DRBG context, and prepares it for mbedtls_ctr_drbg_seed() or mbedtls_ctr_drbg_free().
This function resets CTR_DRBG context to the state immediately after initial call of mbedtls_ctr_drbg_init().
This function updates the state of the CTR_DRBG context.
This function reseeds the CTR_DRBG context, that is extracts data from the entropy source.
This function sets the amount of entropy grabbed as a nonce for the initial seeding. Call this function before calling mbedtls_ctr_drbg_seed() to read a nonce from the entropy source during the initial seeding.
This function sets the reseed interval. The reseed interval is the number of calls to mbedtls_ctr_drbg_random() or mbedtls_ctr_drbg_random_with_add() after which the entropy function is called again. The default value is #MBEDTLS_CTR_DRBG_RESEED_INTERVAL.
This function turns prediction resistance on or off. The default value is off.
This function sets the amount of entropy grabbed on each seed or reseed. The default value is #MBEDTLS_CTR_DRBG_ENTROPY_LEN.