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Diffstat (limited to 'lib/crypto/doc/src/crypto.xml')
| -rw-r--r-- | lib/crypto/doc/src/crypto.xml | 125 |
1 files changed, 123 insertions, 2 deletions
diff --git a/lib/crypto/doc/src/crypto.xml b/lib/crypto/doc/src/crypto.xml index 464799b320..3a5efd0bea 100644 --- a/lib/crypto/doc/src/crypto.xml +++ b/lib/crypto/doc/src/crypto.xml @@ -790,9 +790,16 @@ <seealso marker="stdlib:rand">random number generation</seealso>, in order to generate cryptographically strong random numbers (based on OpenSSL's <c>BN_rand_range</c>), - and saves it on process dictionary before returning it as well. + and saves it in the process dictionary before returning it as well. See also - <seealso marker="stdlib:rand#seed-1">rand:seed/1</seealso>. + <seealso marker="stdlib:rand#seed-1">rand:seed/1</seealso> and + <seealso marker="#rand_seed_s-0">rand_seed_s/0</seealso>. + </p> + <p> + When using the state object from this function the + <seealso marker="stdlib:rand">rand</seealso> functions using it + may throw exception <c>low_entropy</c> in case the random generator + failed due to lack of secure "randomness". </p> <p><em>Example</em></p> <pre> @@ -814,6 +821,120 @@ _FloatValue = rand:uniform(). % [0.0; 1.0[</pre> See also <seealso marker="stdlib:rand#seed_s-1">rand:seed_s/1</seealso>. </p> + <p> + When using the state object from this function the + <seealso marker="stdlib:rand">rand</seealso> functions using it + may throw exception <c>low_entropy</c> in case the random generator + failed due to lack of secure "randomness". + </p> + <note> + <p> + The state returned from this function can not be used + to get a reproducable random sequence as from + the other + <seealso marker="stdlib:rand">rand</seealso> + functions, + since reproducability does not match cryptographically safe. + </p> + <p> + The only supported usage is to generate one distinct + random sequence from this start state. + </p> + </note> + </desc> + </func> + + <func> + <name>rand_seed_alg(Alg) -> rand:state()</name> + <fsummary>Strong random number generation plugin state</fsummary> + <type> + <v>Alg = crypto | crypto_cache</v> + </type> + <desc> + <marker id="rand_seed_alg-1" /> + <p> + Creates state object for + <seealso marker="stdlib:rand">random number generation</seealso>, + in order to generate cryptographically strong random numbers. + See also + <seealso marker="stdlib:rand#seed-1">rand:seed/1</seealso> and + <seealso marker="#rand_seed_alg_s-1">rand_seed_alg_s/1</seealso>. + </p> + <p> + When using the state object from this function the + <seealso marker="stdlib:rand">rand</seealso> functions using it + may throw exception <c>low_entropy</c> in case the random generator + failed due to lack of secure "randomness". + </p> + <p> + The cache size can be changed from its default value using the + <seealso marker="crypto_app"> + crypto app's + </seealso> configuration parameter <c>rand_cache_size</c>. + </p> + <p><em>Example</em></p> + <pre> +_ = crypto:rand_seed_alg(crypto_cache), +_IntegerValue = rand:uniform(42), % [1; 42] +_FloatValue = rand:uniform(). % [0.0; 1.0[</pre> + </desc> + </func> + + <func> + <name>rand_seed_alg_s(Alg) -> rand:state()</name> + <fsummary>Strong random number generation plugin state</fsummary> + <type> + <v>Alg = crypto | crypto_cache</v> + </type> + <desc> + <marker id="rand_seed_alg_s-1" /> + <p> + Creates state object for + <seealso marker="stdlib:rand">random number generation</seealso>, + in order to generate cryptographically strongly random numbers. + See also + <seealso marker="stdlib:rand#seed_s-1">rand:seed_s/1</seealso>. + </p> + <p> + If <c>Alg</c> is <c>crypto</c> this function behaves exactly like + <seealso marker="#rand_seed_s-0">rand_seed_s/0</seealso>. + </p> + <p> + If <c>Alg</c> is <c>crypto_cache</c> this function + fetches random data with OpenSSL's <c>RAND_bytes</c> + and caches it for speed using an internal word size + of 56 bits that makes calculations fast on 64 bit machines. + </p> + <p> + When using the state object from this function the + <seealso marker="stdlib:rand">rand</seealso> functions using it + may throw exception <c>low_entropy</c> in case the random generator + failed due to lack of secure "randomness". + </p> + <p> + The cache size can be changed from its default value using the + <seealso marker="crypto_app"> + crypto app's + </seealso> configuration parameter <c>rand_cache_size</c>. + </p> + <note> + <p> + The state returned from this function can not be used + to get a reproducable random sequence as from + the other + <seealso marker="stdlib:rand">rand</seealso> + functions, + since reproducability does not match cryptographically safe. + </p> + <p> + In fact since random data is cached some numbers may + get reproduced if you try, but this is unpredictable. + </p> + <p> + The only supported usage is to generate one distinct + random sequence from this start state. + </p> + </note> </desc> </func> |