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-rw-r--r--srtp/crypto/include/prng.h54
1 files changed, 54 insertions, 0 deletions
diff --git a/srtp/crypto/include/prng.h b/srtp/crypto/include/prng.h
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+++ b/srtp/crypto/include/prng.h
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+/*
+ * prng.h
+ *
+ * pseudorandom source
+ *
+ * David A. McGrew
+ * Cisco Systems, Inc.
+ */
+
+#ifndef PRNG_H
+#define PRNG_H
+
+#include "rand_source.h" /* for rand_source_func_t definition */
+#include "aes.h" /* for aes */
+#include "aes_icm.h" /* for aes ctr */
+
+#define MAX_PRNG_OUT_LEN 0xffffffffU
+
+/*
+ * x917_prng is an ANSI X9.17-like AES-based PRNG
+ */
+
+typedef struct {
+ v128_t state; /* state data */
+ aes_expanded_key_t key; /* secret key */
+ uint32_t octet_count; /* number of octets output since last init */
+ rand_source_func_t rand; /* random source for re-initialization */
+} x917_prng_t;
+
+err_status_t
+x917_prng_init(rand_source_func_t random_source);
+
+err_status_t
+x917_prng_get_octet_string(uint8_t *dest, uint32_t len);
+
+
+/*
+ * ctr_prng is an AES-CTR based PRNG
+ */
+
+typedef struct {
+ uint32_t octet_count; /* number of octets output since last init */
+ aes_icm_ctx_t state; /* state data */
+ rand_source_func_t rand; /* random source for re-initialization */
+} ctr_prng_t;
+
+err_status_t
+ctr_prng_init(rand_source_func_t random_source);
+
+err_status_t
+ctr_prng_get_octet_string(void *dest, uint32_t len);
+
+
+#endif