--- a/crypto/cipher/aes.c	
+++ a/crypto/cipher/aes.c	
@@ -1999,7 +1999,7 @@ aes_inv_final_round(v128_t *state, const v128_t *round_key) {
 
 
 void
-aes_encrypt(v128_t *plaintext, const aes_expanded_key_t *exp_key) {
+srtp_aes_encrypt(v128_t *plaintext, const aes_expanded_key_t *exp_key) {
 
   /* add in the subkey */
   v128_xor_eq(plaintext, &exp_key->round[0]);
--- a/crypto/cipher/aes_cbc.c	
+++ a/crypto/cipher/aes_cbc.c	
@@ -182,7 +182,7 @@ aes_cbc_encrypt(aes_cbc_ctx_t *c,
     debug_print(mod_aes_cbc, "inblock:  %s", 
 	      v128_hex_string(&c->state));
 
-    aes_encrypt(&c->state, &c->expanded_key);
+    srtp_aes_encrypt(&c->state, &c->expanded_key);
 
     debug_print(mod_aes_cbc, "outblock: %s", 
 	      v128_hex_string(&c->state));
--- a/crypto/cipher/aes_icm.c	
+++ a/crypto/cipher/aes_icm.c	
@@ -240,7 +240,7 @@ aes_icm_set_octet(aes_icm_ctx_t *c,
   /* fill keystream buffer, if needed */
   if (tail_num) {
     v128_copy(&c->keystream_buffer, &c->counter);
-    aes_encrypt(&c->keystream_buffer, &c->expanded_key);
+    srtp_aes_encrypt(&c->keystream_buffer, &c->expanded_key);
     c->bytes_in_buffer = sizeof(v128_t);
 
     debug_print(mod_aes_icm, "counter:    %s", 
@@ -296,7 +296,7 @@ static inline void
 aes_icm_advance_ismacryp(aes_icm_ctx_t *c, uint8_t forIsmacryp) {
   /* fill buffer with new keystream */
   v128_copy(&c->keystream_buffer, &c->counter);
-  aes_encrypt(&c->keystream_buffer, &c->expanded_key);
+  srtp_aes_encrypt(&c->keystream_buffer, &c->expanded_key);
   c->bytes_in_buffer = sizeof(v128_t);
 
   debug_print(mod_aes_icm, "counter:    %s", 
--- a/crypto/include/aes.h	
+++ a/crypto/include/aes.h	
@@ -70,7 +70,7 @@ aes_expand_decryption_key(const uint8_t *key,
 			  aes_expanded_key_t *expanded_key);
 
 void
-aes_encrypt(v128_t *plaintext, const aes_expanded_key_t *exp_key);
+srtp_aes_encrypt(v128_t *plaintext, const aes_expanded_key_t *exp_key);
 
 void
 aes_decrypt(v128_t *plaintext, const aes_expanded_key_t *exp_key);
--- a/crypto/rng/prng.c	
+++ a/crypto/rng/prng.c	
@@ -108,7 +108,7 @@ x917_prng_get_octet_string(uint8_t *dest, uint32_t len) {
     v128_copy(&buffer, &x917_prng.state);
 
     /* apply aes to buffer */
-    aes_encrypt(&buffer, &x917_prng.key);
+    srtp_aes_encrypt(&buffer, &x917_prng.key);
     
     /* write data to output */
     *dest++ = buffer.v8[0];
@@ -132,7 +132,7 @@ x917_prng_get_octet_string(uint8_t *dest, uint32_t len) {
     buffer.v32[0] ^= t;
 
     /* encrypt buffer */
-    aes_encrypt(&buffer, &x917_prng.key);
+    srtp_aes_encrypt(&buffer, &x917_prng.key);
 
     /* copy buffer into state */
     v128_copy(&x917_prng.state, &buffer);
@@ -150,7 +150,7 @@ x917_prng_get_octet_string(uint8_t *dest, uint32_t len) {
     v128_copy(&buffer, &x917_prng.state);
 
     /* apply aes to buffer */
-    aes_encrypt(&buffer, &x917_prng.key);
+    srtp_aes_encrypt(&buffer, &x917_prng.key);
 
     /* write data to output */
     for (i=0; i < tail_len; i++) {
@@ -163,7 +163,7 @@ x917_prng_get_octet_string(uint8_t *dest, uint32_t len) {
     buffer.v32[0] ^= t;
 
     /* encrypt buffer */
-    aes_encrypt(&buffer, &x917_prng.key);
+    srtp_aes_encrypt(&buffer, &x917_prng.key);
 
     /* copy buffer into state */
     v128_copy(&x917_prng.state, &buffer);
--- a/crypto/test/aes_calc.c	
+++ a/crypto/test/aes_calc.c	
@@ -105,7 +105,7 @@ main (int argc, char *argv[]) {
     exit(1);
   }
 
-  aes_encrypt(&data, &exp_key);
+  srtp_aes_encrypt(&data, &exp_key);
 
   /* write ciphertext to output */
   if (verbose) {
--- a/tables/aes_tables.c	
+++ a/tables/aes_tables.c	
@@ -294,7 +294,7 @@ main(void) {
 
 #if AES_INVERSE_TEST
   /* 
-   * test that aes_encrypt and aes_decrypt are actually
+   * test that srtp_aes_encrypt and aes_decrypt are actually
    * inverses of each other 
    */
     
@@ -331,7 +331,7 @@ aes_test_inverse(void) {
   v128_copy_octet_string(&x, plaintext);
   aes_expand_encryption_key(k, expanded_key);
   aes_expand_decryption_key(k, decrypt_key);
-  aes_encrypt(&x, expanded_key);
+  srtp_aes_encrypt(&x, expanded_key);
   aes_decrypt(&x, decrypt_key);
   
   /* compare to expected value then report */