diff options
Diffstat (limited to 'crypto/Kconfig')
| -rw-r--r-- | crypto/Kconfig | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/crypto/Kconfig b/crypto/Kconfig index 00c827d9f0d2d..ed931ddea644d 100644 --- a/crypto/Kconfig +++ b/crypto/Kconfig @@ -1339,6 +1339,23 @@ config CRYPTO_JITTERENTROPY_MEMORY_BLOCKSIZE default 1024 if CRYPTO_JITTERENTROPY_MEMSIZE_1024 default 2048 if CRYPTO_JITTERENTROPY_MEMSIZE_8192 +config CRYPTO_JITTERENTROPY_OSR + int "CPU Jitter RNG Oversampling Rate" + range 1 15 + default 1 + depends on CRYPTO_JITTERENTROPY + help + The Jitter RNG allows the specification of an oversampling rate (OSR). + The Jitter RNG operation requires a fixed amount of timing + measurements to produce one output block of random numbers. The + OSR value is multiplied with the amount of timing measurements to + generate one output block. Thus, the timing measurement is oversampled + by the OSR factor. The oversampling allows the Jitter RNG to operate + on hardware whose timers deliver limited amount of entropy (e.g. + the timer is coarse) by setting the OSR to a higher value. The + trade-off, however, is that the Jitter RNG now requires more time + to generate random numbers. + config CRYPTO_JITTERENTROPY_TESTINTERFACE bool "CPU Jitter RNG Test Interface" depends on CRYPTO_JITTERENTROPY |