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Document dependency on gmtime, gmtime_r & gmtime_s

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This commit is contained in:
Andres Amaya Garcia 2018-08-07 20:39:27 +01:00
parent 824dfb34b4
commit 97f3ecb972
1 changed files with 9 additions and 1 deletions
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10
include/mbedtls/config.h
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@ -137,12 +137,20 @@
/**
* \def MBEDTLS_HAVE_TIME_DATE
*
* System has time.h and time(), gmtime() and the clock is correct.
* System has time.h and time(), gmtime_s() (Windows), gmtime_r() (POSIX) or
* gmtime() and the clock is correct.
* The time needs to be correct (not necesarily very accurate, but at least
* the date should be correct). This is used to verify the validity period of
* X.509 certificates.
*
* Comment if your system does not have a correct clock.
*
* \warning gmtime() is used if the target platform is neither Windows nor
* POSIX. Unfortunately, gmtime() is not thread-safe, so a mutex is used when
* MBEDTLS_THREADING_C is defined to guarantee sequential usage of gmtime()
* across Mbed TLS threads. However, applications must ensure that calls to
* gmtime() from outside the library also use the mutex to avoid concurrency
* issues.
*/
#define MBEDTLS_HAVE_TIME_DATE