#include "padlock_plugin.h"
#include "padlock_aes_crypter.h"
#include "padlock_sha1_hasher.h"
+#include "padlock_rng.h"
#include <stdio.h>
*/
static void destroy(private_padlock_plugin_t *this)
{
+ if (this->features & PADLOCK_RNG_ENABLED)
+ {
+ lib->crypto->remove_rng(lib->crypto,
+ (rng_constructor_t)padlock_rng_create);
+ lib->crypto->remove_rng(lib->crypto,
+ (rng_constructor_t)padlock_rng_create);
+ lib->crypto->remove_rng(lib->crypto,
+ (rng_constructor_t)padlock_rng_create);
+ }
if (this->features & PADLOCK_ACE2_ENABLED)
{
lib->crypto->remove_crypter(lib->crypto,
this->features & PADLOCK_PHE_ENABLED ? " PHE" : "",
this->features & PADLOCK_PMM_ENABLED ? " PMM" : "");
+ if (this->features & PADLOCK_RNG_ENABLED)
+ {
+ lib->crypto->add_rng(lib->crypto, RNG_REAL,
+ (rng_constructor_t)padlock_rng_create);
+ lib->crypto->add_rng(lib->crypto, RNG_STRONG,
+ (rng_constructor_t)padlock_rng_create);
+ lib->crypto->add_rng(lib->crypto, RNG_WEAK,
+ (rng_constructor_t)padlock_rng_create);
+ }
if (this->features & PADLOCK_ACE2_ENABLED)
{
lib->crypto->add_crypter(lib->crypto, ENCR_AES_CBC,
--- /dev/null
+/*
+ * Copyright (C) 2008 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ * $Id$
+ */
+
+#include "padlock_rng.h"
+
+typedef struct private_padlock_rng_t private_padlock_rng_t;
+typedef enum padlock_quality_factor_t padlock_quality_factor_t;
+
+/**
+ * Padlock RNG quality factors
+ */
+enum padlock_quality_factor_t {
+ /* Lowest quality: Reads 8 bytes */
+ PADLOCK_QF0 = 0x00,
+ /* Medium quality: Reads 4 bytes */
+ PADLOCK_QF1 = 0x01,
+ /* Better quality: Reads 2 bytes */
+ PADLOCK_QF2 = 0x10,
+ /* Highest quality: Reads 1 byte */
+ PADLOCK_QF3 = 0x11,
+};
+
+/**
+ * Private data of an padlock_rng_t object.
+ */
+struct private_padlock_rng_t {
+
+ /**
+ * Public padlock_rng_t interface.
+ */
+ padlock_rng_t public;
+
+ /**
+ * Padlock quality factor
+ */
+ padlock_quality_factor_t quality;
+};
+
+/**
+ * Get bytes from Padlock RNG. buf should have space for (len + 7)
+ */
+static void rng(char *buf, int len, int quality)
+{
+ while (len > 0)\r
+ {
+ int status;
+
+ /* run XSTORE until we have all bytes needed. We do not use REP, as
+ * this should not be performance critical and it's easier this way. */
+ asm volatile (
+ ".byte 0x0F,0xA7,0xC0 \n\t"\r
+ : "=D"(buf), "=a"(status)\r
+ : "d"(quality), "D"(buf));
+
+ /* bits[0..4] of status word contains the number of bytes read */
+ len -= status & 0x1F;
+ }
+}
+
+/**
+ * Implementation of padlock_rng_t.allocate_bytes.
+ */
+static void allocate_bytes(private_padlock_rng_t *this, size_t bytes,
+ chunk_t *chunk)
+{
+ chunk->len = bytes;
+ /* padlock requires some additional bytes */
+ chunk->ptr = malloc(bytes + 7);
+
+ rng(chunk->ptr, chunk->len, this->quality);
+}
+
+/**
+ * Implementation of padlock_rng_t.get_bytes.
+ */
+static void get_bytes(private_padlock_rng_t *this, size_t bytes,
+ u_int8_t *buffer)
+{
+ chunk_t chunk;
+
+ /* Padlock needs a larger buffer than "bytes", we need a new buffer */
+ allocate_bytes(this, bytes, &chunk);
+ memcpy(buffer, chunk.ptr, bytes);
+ chunk_clear(&chunk);
+}
+
+/**
+ * Implementation of padlock_rng_t.destroy.
+ */
+static void destroy(private_padlock_rng_t *this)
+{
+ free(this);
+}
+
+/*
+ * Described in header.
+ */
+padlock_rng_t *padlock_rng_create(rng_quality_t quality)
+{
+ private_padlock_rng_t *this = malloc_thing(private_padlock_rng_t);
+
+ this->public.rng.get_bytes = (void (*) (rng_t *, size_t, u_int8_t*)) get_bytes;
+ this->public.rng.allocate_bytes = (void (*) (rng_t *, size_t, chunk_t*)) allocate_bytes;
+ this->public.rng.destroy = (void (*) (rng_t *))destroy;
+
+ /* map RNG quality to Padlock quality factor */
+ switch (quality)
+ {
+ case RNG_WEAK:
+ this->quality = PADLOCK_QF0;
+ break;
+ case RNG_STRONG:
+ this->quality = PADLOCK_QF1;
+ break;
+ case RNG_REAL:
+ this->quality = PADLOCK_QF3;
+ break;
+ }
+
+ return &this->public;
+}
+
--- /dev/null
+/*
+ * Copyright (C) 2008 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ * $Id$
+ */
+
+/**
+ * @defgroup padlock_rng padlock_rng
+ * @{ @ingroup padlock
+ */
+
+#ifndef PADLOCK_RNG_H_
+#define PADLOCK_RNG_H_
+
+#include <crypto/rngs/rng.h>
+
+typedef struct padlock_rng_t padlock_rng_t;
+
+/**
+ * Hardware-RNG based on via Padlock.
+ */
+struct padlock_rng_t {
+
+ /**
+ * Implements rng_t interface.
+ */
+ rng_t rng;
+};
+
+/**
+ * Create a padlock_rng instance.
+ *
+ * @param quality required quality of randomness
+ * @return created random_rng_t
+ */
+padlock_rng_t *padlock_rng_create(rng_quality_t quality);
+
+#endif /* PADLOCK_RNG_ @}*/
projects / strongswan.git / commitdiff