120 lines
4.3 KiB
Diff
120 lines
4.3 KiB
Diff
diff -up libgcrypt-1.4.6/random/random-fips.c.cfgrandom libgcrypt-1.4.6/random/random-fips.c
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--- libgcrypt-1.4.6/random/random-fips.c.cfgrandom 2011-06-20 21:13:38.000000000 +0200
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+++ libgcrypt-1.4.6/random/random-fips.c 2011-06-20 21:32:47.000000000 +0200
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@@ -27,10 +27,10 @@
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There are 3 random context which map to the different levels of
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random quality:
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- Generator Seed and Key Kernel entropy (init/reseed)
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- ------------------------------------------------------------
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- GCRY_VERY_STRONG_RANDOM /dev/urandom 256/128 bits
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- GCRY_STRONG_RANDOM /dev/urandom 256/128 bits
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+ Generator Seed and Key Kernel entropy (init/reseed)
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+ ---------------------------------------------------------------------------------------
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+ GCRY_VERY_STRONG_RANDOM /etc/gcrypt/rngseed+/dev/urandom 256/128 bits
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+ GCRY_STRONG_RANDOM /etc/gcrypt/rngseed+/dev/urandom 256/128 bits
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gcry_create_nonce GCRY_STRONG_RANDOM n/a
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All random generators return their data in 128 bit blocks. If the
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@@ -40,7 +40,10 @@
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(SEED_TTL) output blocks; the re-seeding is disabled in test mode.
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The GCRY_VERY_STRONG_RANDOM and GCRY_STRONG_RANDOM generators are
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- keyed and seeded from the /dev/urandom device.
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+ keyed and seeded with data that is loaded from the /etc/gcrypt/rngseed
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+ if the device or symlink to device exists xored with the data
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+ from the /dev/urandom device. This allows the system administrator
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+ to always seed the RNGs from /dev/random if it is required.
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The gcry_create_nonce generator is keyed and seeded from the
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GCRY_STRONG_RANDOM generator. It may also block if the
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@@ -559,6 +562,10 @@ get_entropy (size_t nbytes)
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entropy_collect_buffer_len = 0;
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#if USE_RNDLINUX
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+ _gcry_rndlinux_gather_random (entropy_collect_cb, 0,
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+ X931_AES_KEYLEN,
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+ -1);
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+ entropy_collect_buffer_len = 0;
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rc = _gcry_rndlinux_gather_random (entropy_collect_cb, 0,
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X931_AES_KEYLEN,
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GCRY_STRONG_RANDOM);
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diff -up libgcrypt-1.4.6/random/rndlinux.c.cfgrandom libgcrypt-1.4.6/random/rndlinux.c
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--- libgcrypt-1.4.6/random/rndlinux.c.cfgrandom 2009-04-02 11:25:34.000000000 +0200
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+++ libgcrypt-1.4.6/random/rndlinux.c 2011-06-20 21:34:09.000000000 +0200
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@@ -35,7 +35,9 @@
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#include "g10lib.h"
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#include "rand-internal.h"
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-static int open_device ( const char *name );
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+#define NAME_OF_CFG_RNGSEED "/etc/gcrypt/rngseed"
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+
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+static int open_device ( const char *name, int fatal );
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static int
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@@ -56,13 +58,17 @@ set_cloexec_flag (int fd)
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* Used to open the /dev/random devices (Linux, xBSD, Solaris (if it exists)).
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*/
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static int
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-open_device ( const char *name )
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+open_device ( const char *name, int fatal )
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{
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int fd;
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fd = open ( name, O_RDONLY );
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if ( fd == -1 )
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- log_fatal ("can't open %s: %s\n", name, strerror(errno) );
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+ {
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+ if (! fatal)
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+ return fd;
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+ log_fatal ("can't open %s: %s\n", name, strerror(errno) );
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+ }
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if (set_cloexec_flag (fd))
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log_error ("error setting FD_CLOEXEC on fd %d: %s\n",
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@@ -91,11 +97,13 @@ _gcry_rndlinux_gather_random (void (*add
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{
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static int fd_urandom = -1;
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static int fd_random = -1;
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+ static int fd_configured = -1;
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int fd;
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int n;
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int warn=0;
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byte buffer[768];
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size_t n_hw;
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+ size_t orig_length = length;
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/* First read from a hardware source. However let it account only
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for up to 50% of the requested bytes. */
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@@ -106,16 +114,26 @@ _gcry_rndlinux_gather_random (void (*add
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length -= n_hw;
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/* Open the requested device. */
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+
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+ if (level == -1)
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+ {
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+ if (fd_configured == -1)
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+ fd_configured = open_device ( NAME_OF_CFG_RNGSEED, 0 );
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+ fd = fd_configured;
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+ if (fd == -1)
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+ return -1;
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+ }
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+
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if (level >= 2)
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{
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if( fd_random == -1 )
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- fd_random = open_device ( NAME_OF_DEV_RANDOM );
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+ fd_random = open_device ( NAME_OF_DEV_RANDOM, 1 );
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fd = fd_random;
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}
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- else
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+ else if (level != -1)
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{
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if( fd_urandom == -1 )
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- fd_urandom = open_device ( NAME_OF_DEV_URANDOM );
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+ fd_urandom = open_device ( NAME_OF_DEV_URANDOM, 1 );
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fd = fd_urandom;
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}
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