1 files changed, 22 insertions, 0 deletions
diff --git a/chip/g/trng.c b/chip/g/trng.c
index e462127da8..b6a062d58d 100644
--- a/chip/g/trng.c
+++ b/chip/g/trng.c
@@ -20,3 +20,25 @@ uint32_t rand(void)
 		;
 	return GREAD(TRNG, READ_DATA);
 }
+
+void rand_bytes(void *buffer, size_t len)
+{
+	int random_togo = 0;
+	int buffer_index = 0;
+	uint32_t random_value;
+	uint8_t *buf = (uint8_t *) buffer;
+
+	/*
+	 * Retrieve random numbers in 4 byte quantities and pack as many bytes
+	 * as needed into 'buffer'. If len is not divisible by 4, the
+	 * remaining random bytes get dropped.
+	 */
+	while (buffer_index < len) {
+		if (!random_togo) {
+			random_value = rand();
+			random_togo = sizeof(random_value);
+		}
+		buf[buffer_index++] = random_value >>
+			((random_togo-- - 1) * 8);
+	}
+}