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CTR_DRBG: add the possibility of grabbing entropy for a nonce

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Add a new function mbedtls_ctr_drbg_set_nonce_len() which configures
the DRBG instance to call f_entropy a second time during the initial
seeding to grab a nonce.

The default nonce length is 0, so there is no behavior change unless
the user calls the new function.
This commit is contained in:
Gilles Peskine 2019-10-22 18:42:27 +02:00
parent 9be5098061
commit 97f59ab527
1 changed files with 4 additions and 4 deletions
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2
library/ctr_drbg.c
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@ -357,7 +357,7 @@ void mbedtls_ctr_drbg_update( mbedtls_ctr_drbg_context *ctx,
* and with output * and with output
* ctx contains new_working_state * ctx contains new_working_state
*/ */
int mbedtls_ctr_drbg_reseed_internal( mbedtls_ctr_drbg_context *ctx, static int mbedtls_ctr_drbg_reseed_internal( mbedtls_ctr_drbg_context *ctx,
const unsigned char *additional, const unsigned char *additional,
size_t len, size_t len,
size_t nonce_len ) size_t nonce_len )