123 lines
3.8 KiB
Diff
123 lines
3.8 KiB
Diff
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--- a/drivers/char/random.c
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+++ b/drivers/char/random.c
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@@ -129,6 +129,9 @@
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* unsigned int value);
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* void add_interrupt_randomness(int irq);
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*
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+ * void random_input_words(__u32 *buf, size_t wordcount, int ent_count)
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+ * int random_input_wait(void);
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+ *
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* add_input_randomness() uses the input layer interrupt timing, as well as
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* the event type information from the hardware.
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*
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@@ -140,6 +143,13 @@
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* a better measure, since the timing of the disk interrupts are more
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* unpredictable.
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*
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+ * random_input_words() just provides a raw block of entropy to the input
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+ * pool, such as from a hardware entropy generator.
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+ *
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+ * random_input_wait() suspends the caller until such time as the
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+ * entropy pool falls below the write threshold, and returns a count of how
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+ * much entropy (in bits) is needed to sustain the pool.
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+ *
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* All of these routines try to estimate how many bits of randomness a
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* particular randomness source. They do this by keeping track of the
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* first and second order deltas of the event timings.
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@@ -712,6 +722,61 @@ void add_disk_randomness(struct gendisk
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}
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#endif
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+/*
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+ * random_input_words - add bulk entropy to pool
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+ *
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+ * @buf: buffer to add
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+ * @wordcount: number of __u32 words to add
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+ * @ent_count: total amount of entropy (in bits) to credit
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+ *
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+ * this provides bulk input of entropy to the input pool
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+ *
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+ */
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+void random_input_words(__u32 *buf, size_t wordcount, int ent_count)
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+{
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+ mix_pool_bytes(&input_pool, buf, wordcount*4);
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+
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+ credit_entropy_bits(&input_pool, ent_count);
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+
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+ DEBUG_ENT("crediting %d bits => %d\n",
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+ ent_count, input_pool.entropy_count);
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+ /*
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+ * Wake up waiting processes if we have enough
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+ * entropy.
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+ */
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+ if (input_pool.entropy_count >= random_read_wakeup_thresh)
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+ wake_up_interruptible(&random_read_wait);
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+}
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+EXPORT_SYMBOL(random_input_words);
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+
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+/*
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+ * random_input_wait - wait until random needs entropy
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+ *
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+ * this function sleeps until the /dev/random subsystem actually
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+ * needs more entropy, and then return the amount of entropy
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+ * that it would be nice to have added to the system.
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+ */
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+int random_input_wait(void)
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+{
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+ int count;
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+
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+ wait_event_interruptible(random_write_wait,
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+ input_pool.entropy_count < random_write_wakeup_thresh);
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+
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+ count = random_write_wakeup_thresh - input_pool.entropy_count;
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+
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+ /* likely we got woken up due to a signal */
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+ if (count <= 0) count = random_read_wakeup_thresh;
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+
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+ DEBUG_ENT("requesting %d bits from input_wait()er %d<%d\n",
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+ count,
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+ input_pool.entropy_count, random_write_wakeup_thresh);
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+
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+ return count;
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+}
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+EXPORT_SYMBOL(random_input_wait);
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+
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+
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#define EXTRACT_SIZE 10
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/*********************************************************************
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--- a/fs/fcntl.c
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+++ b/fs/fcntl.c
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@@ -196,6 +196,7 @@ static int setfl(int fd, struct file * f
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out:
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return error;
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}
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+EXPORT_SYMBOL(sys_dup);
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static void f_modown(struct file *filp, struct pid *pid, enum pid_type type,
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uid_t uid, uid_t euid, int force)
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--- a/include/linux/miscdevice.h
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+++ b/include/linux/miscdevice.h
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@@ -12,6 +12,7 @@
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#define APOLLO_MOUSE_MINOR 7
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#define PC110PAD_MINOR 9
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/*#define ADB_MOUSE_MINOR 10 FIXME OBSOLETE */
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+#define CRYPTODEV_MINOR 70 /* /dev/crypto */
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#define WATCHDOG_MINOR 130 /* Watchdog timer */
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#define TEMP_MINOR 131 /* Temperature Sensor */
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#define RTC_MINOR 135
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--- a/include/linux/random.h
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+++ b/include/linux/random.h
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@@ -50,6 +50,10 @@ extern void add_input_randomness(unsigne
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unsigned int value);
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extern void add_interrupt_randomness(int irq);
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+extern void random_input_words(__u32 *buf, size_t wordcount, int ent_count);
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+extern int random_input_wait(void);
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+#define HAS_RANDOM_INPUT_WAIT 1
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+
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extern void get_random_bytes(void *buf, int nbytes);
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void generate_random_uuid(unsigned char uuid_out[16]);
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