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.rnd issues

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Bodo Möller 2001-05-03 09:27:43 +00:00
parent 8e264a933f
commit 24cc290b85
2 changed files with 41 additions and 4 deletions
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9
CHANGES
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@ -11,6 +11,15 @@
*) applies to 0.9.6a (/0.9.6b) and 0.9.7
+) applies to 0.9.7 only
*) In versions up to 0.9.6, RAND_file_name() resorted to file ".rnd"
in the current directory if neither $RANDFILE nor $HOME was set.
RAND_file_name() in 0.9.6a returned NULL in this case. This has
caused some confusion to Windows users who haven't defined $HOME.
Thus RAND_file_name() is changed again: e_os.h can define a
DEFAULT_HOME, which will be used if $HOME is not set.
For Windows, we use "C:"; on other platforms, we still require
environment variables.
+) Add "ex_data" support to ENGINE so implementations can add state at a
per-structure level rather than having to store it globally.
[Geoff]

36
FAQ
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@ -17,6 +17,7 @@ OpenSSL - Frequently Asked Questions
[USER] Questions on using the OpenSSL applications
* Why do I get a "PRNG not seeded" error message?
* Why do I get an "unable to write 'random state'" error message?
* How do I create certificates or certificate requests?
* Why can't I create certificate requests?
* Why does <SSL program> fail with a certificate verify error?
@ -161,6 +162,7 @@ correctly. Many open source operating systems provide a "randomness
device" that serves this purpose. On other systems, applications have
to call the RAND_add() or RAND_seed() function with appropriate data
before generating keys or performing public key encryption.
(These functions initialize the pseudo-random number generator, PRNG.)
Some broken applications do not do this. As of version 0.9.5, the
OpenSSL functions that need randomness report an error if the random
@ -176,10 +178,24 @@ details. Starting with version 0.9.7, OpenSSL will automatically look
for an EGD socket at /var/run/egd-pool, /dev/egd-pool, /etc/egd-pool and
/etc/entropy.
Most components of the openssl command line tool try to use the
file $HOME/.rnd (or $RANDFILE, if this environment variable is set)
for seeding the PRNG. If this file does not exist or is too short,
the "PRNG not seeded" error message may occur.
Most components of the openssl command line utility automatically try
to seed the random number generator from a file. The name of the
default seeding file is determined as follows: If environment variable
RANDFILE is set, then it names the seeding file. Otherwise if
environment variable HOME is set, then the seeding file is $HOME/.rnd.
If neither RANDFILE nor HOME is set, versions up to OpenSSL 0.9.6 will
use file .rnd in the current directory while OpenSSL 0.9.6a uses no
default seeding file at all. OpenSSL 0.9.6b and later will behave
similarly to 0.9.6a, but will use a default of "C:" for HOME on
Windows systems if the environment variable has not been set.
If the default seeding file does not exist or is too short, the "PRNG
not seeded" error message may occur.
The openssl command line utility will write back a new state to the
default seeding file (and create this file if necessary) unless
there was no sufficient seeding.
Pointing $RANDFILE to an Entropy Gathering Daemon socket does not work.
Use the "-rand" option of the OpenSSL command line tools instead.
The $RANDFILE environment variable and $HOME/.rnd are only used by the
@ -195,6 +211,18 @@ versions. However, be warned that /dev/random is usually a blocking
device, which may have some effects on OpenSSL.
* Why do I get an "unable to write 'random state'" error message?
Sometimes the openssl command line utility does not abort with
a "PRNG not seeded" error message, but complains that it is
"unable to write 'random state'". This message refers to the
default seeding file (see previous answer). A possible reason
is that no default filename is known because neither RANDFILE
nor HOME is set. (Versions up to 0.9.6 used file ".rnd" in the
current directory in this case, but this has changed with 0.9.6a.)
* How do I create certificates or certificate requests?
Check out the CA.pl(1) manual page. This provides a simple wrapper round