diff --git a/crypto/hash/hmac.c b/crypto/hash/hmac.c
index 4f389fe..5ab81e5 100644
--- a/crypto/hash/hmac.c
+++ b/crypto/hash/hmac.c
@@ -137,10 +137,10 @@ hmac_init(hmac_ctx_t *state, const uint8_t *key, int key_len) {
   debug_print(mod_hmac, "ipad: %s", octet_string_hex_string(ipad, 64));
   
   /* initialize sha1 context */
-  sha1_init(&state->init_ctx);
+  srtp_sha1_init(&state->init_ctx);
 
   /* hash ipad ^ key */
-  sha1_update(&state->init_ctx, ipad, 64);
+  srtp_sha1_update(&state->init_ctx, ipad, 64);
   memcpy(&state->ctx, &state->init_ctx, sizeof(sha1_ctx_t)); 
 
   return err_status_ok;
@@ -161,7 +161,7 @@ hmac_update(hmac_ctx_t *state, const uint8_t *message, int msg_octets) {
 	      octet_string_hex_string(message, msg_octets));
   
   /* hash message into sha1 context */
-  sha1_update(&state->ctx, message, msg_octets);
+  srtp_sha1_update(&state->ctx, message, msg_octets);
 
   return err_status_ok;
 }
@@ -179,7 +179,7 @@ hmac_compute(hmac_ctx_t *state, const void *message,
   
   /* hash message, copy output into H */
   hmac_update(state, (const uint8_t*)message, msg_octets);
-  sha1_final(&state->ctx, H);
+  srtp_sha1_final(&state->ctx, H);
 
   /*
    * note that we don't need to debug_print() the input, since the
@@ -189,16 +189,16 @@ hmac_compute(hmac_ctx_t *state, const void *message,
 	      octet_string_hex_string((uint8_t *)H, 20));
 
   /* re-initialize hash context */
-  sha1_init(&state->ctx);
+  srtp_sha1_init(&state->ctx);
   
   /* hash opad ^ key  */
-  sha1_update(&state->ctx, (uint8_t *)state->opad, 64);
+  srtp_sha1_update(&state->ctx, (uint8_t *)state->opad, 64);
 
   /* hash the result of the inner hash */
-  sha1_update(&state->ctx, (uint8_t *)H, 20);
+  srtp_sha1_update(&state->ctx, (uint8_t *)H, 20);
   
   /* the result is returned in the array hash_value[] */
-  sha1_final(&state->ctx, hash_value);
+  srtp_sha1_final(&state->ctx, hash_value);
 
   /* copy hash_value to *result */
   for (i=0; i < tag_len; i++)    
diff --git a/crypto/hash/sha1.c b/crypto/hash/sha1.c
index b9a8d10..b1c9c8a 100644
--- a/crypto/hash/sha1.c
+++ b/crypto/hash/sha1.c
@@ -74,12 +74,12 @@ uint32_t SHA_K2 = 0x8F1BBCDC;   /* Kt for 40 <= t <= 59 */
 uint32_t SHA_K3 = 0xCA62C1D6;   /* Kt for 60 <= t <= 79 */
 
 void
-sha1(const uint8_t *msg,  int octets_in_msg, uint32_t hash_value[5]) {
+srtp_sha1(const uint8_t *msg,  int octets_in_msg, uint32_t hash_value[5]) {
   sha1_ctx_t ctx;
 
-  sha1_init(&ctx);
-  sha1_update(&ctx, msg, octets_in_msg);
-  sha1_final(&ctx, hash_value);
+  srtp_sha1_init(&ctx);
+  srtp_sha1_update(&ctx, msg, octets_in_msg);
+  srtp_sha1_final(&ctx, hash_value);
 
 }
 
@@ -96,7 +96,7 @@ sha1(const uint8_t *msg,  int octets_in_msg, uint32_t hash_value[5]) {
  */
 
 void
-sha1_core(const uint32_t M[16], uint32_t hash_value[5]) {
+srtp_sha1_core(const uint32_t M[16], uint32_t hash_value[5]) {
   uint32_t H0;
   uint32_t H1;
   uint32_t H2;
@@ -183,7 +183,7 @@ sha1_core(const uint32_t M[16], uint32_t hash_value[5]) {
 }
 
 void
-sha1_init(sha1_ctx_t *ctx) {
+srtp_sha1_init(sha1_ctx_t *ctx) {
 
   /* initialize state vector */
   ctx->H[0] = 0x67452301;
@@ -201,7 +201,7 @@ sha1_init(sha1_ctx_t *ctx) {
 }
 
 void
-sha1_update(sha1_ctx_t *ctx, const uint8_t *msg, int octets_in_msg) {
+srtp_sha1_update(sha1_ctx_t *ctx, const uint8_t *msg, int octets_in_msg) {
   int i;
   uint8_t *buf = (uint8_t *)ctx->M;
 
@@ -226,7 +226,7 @@ sha1_update(sha1_ctx_t *ctx, const uint8_t *msg, int octets_in_msg) {
 
       debug_print(mod_sha1, "(update) running sha1_core()", NULL);
 
-      sha1_core(ctx->M, ctx->H);
+      srtp_sha1_core(ctx->M, ctx->H);
 
     } else {
 
@@ -249,7 +249,7 @@ sha1_update(sha1_ctx_t *ctx, const uint8_t *msg, int octets_in_msg) {
  */
 
 void
-sha1_final(sha1_ctx_t *ctx, uint32_t *output) {
+srtp_sha1_final(sha1_ctx_t *ctx, uint32_t *output) {
   uint32_t A, B, C, D, E, TEMP;
   uint32_t W[80];  
   int i, t;
diff --git a/crypto/include/sha1.h b/crypto/include/sha1.h
index e3af4d4..af59b7e 100644
--- a/crypto/include/sha1.h
+++ b/crypto/include/sha1.h
@@ -72,18 +72,18 @@ typedef EVP_MD_CTX sha1_ctx_t;
  *
  */
 
-static inline void sha1_init (sha1_ctx_t *ctx)
+static inline void srtp_sha1_init (sha1_ctx_t *ctx)
 {
     EVP_MD_CTX_init(ctx);
     EVP_DigestInit(ctx, EVP_sha1());
 }
 
-static inline void sha1_update (sha1_ctx_t *ctx, const uint8_t *M, int octets_in_msg)
+static inline void srtp_sha1_update (sha1_ctx_t *ctx, const uint8_t *M, int octets_in_msg)
 {
     EVP_DigestUpdate(ctx, M, octets_in_msg);
 }
 
-static inline void sha1_final (sha1_ctx_t *ctx, uint32_t *output)
+static inline void srtp_sha1_final (sha1_ctx_t *ctx, uint32_t *output)
 {
     unsigned int len = 0;
 
@@ -107,7 +107,7 @@
  */
 
 void
-sha1(const uint8_t *message,  int octets_in_msg, uint32_t output[5]);
+srtp_sha1(const uint8_t *message,  int octets_in_msg, uint32_t output[5]);
 
 /*
  * sha1_init(&ctx) initializes the SHA1 context ctx
@@ -121,13 +121,13 @@
  */
 
 void
-sha1_init(sha1_ctx_t *ctx);
+srtp_sha1_init(sha1_ctx_t *ctx);
 
 void
-sha1_update(sha1_ctx_t *ctx, const uint8_t *M, int octets_in_msg);
+srtp_sha1_update(sha1_ctx_t *ctx, const uint8_t *M, int octets_in_msg);
 
 void
-sha1_final(sha1_ctx_t *ctx, uint32_t output[5]);
+srtp_sha1_final(sha1_ctx_t *ctx, uint32_t output[5]);
 
 /*
  * The sha1_core function is INTERNAL to SHA-1, but it is declared
@@ -145,7 +145,7 @@
  */
 
 void
-sha1_core(const uint32_t M[16], uint32_t hash_value[5]);
+srtp_sha1_core(const uint32_t M[16], uint32_t hash_value[5]);
 
 #endif /* else OPENSSL */
      
diff --git a/crypto/test/sha1_driver.c b/crypto/test/sha1_driver.c
index 6036022..f29d76e 100644
--- a/crypto/test/sha1_driver.c
+++ b/crypto/test/sha1_driver.c
@@ -107,9 +107,9 @@ sha1_test_case_validate(const hash_test_case_t *test_case) {
   if (test_case->data_len > MAX_HASH_DATA_LEN)
     return err_status_bad_param;
 
-  sha1_init(&ctx);
-  sha1_update(&ctx, test_case->data, test_case->data_len);
-  sha1_final(&ctx, hash_value);
+  srtp_sha1_init(&ctx);
+  srtp_sha1_update(&ctx, test_case->data, test_case->data_len);
+  srtp_sha1_final(&ctx, hash_value);
   if (0 == memcmp(test_case->hash, hash_value, 20)) {
 #if VERBOSE
     printf("PASSED: reference value: %s\n", 
--- libsrtp-1.5.2/crypto/hash/hmac_ossl.c.orig	2015-03-11 15:02:12.000000000 +0100
+++ libsrtp-1.5.2/crypto/hash/hmac_ossl.c	2015-07-05 20:23:10.490406837 +0200
@@ -163,11 +163,11 @@ hmac_init (hmac_ctx_t *state, const uint
     debug_print(mod_hmac, "ipad: %s", octet_string_hex_string(ipad, sizeof(ipad)));
 
     /* initialize sha1 context */
-    sha1_init(&state->init_ctx);
+    srtp_sha1_init(&state->init_ctx);
     state->init_ctx_initialized = 1;
 
     /* hash ipad ^ key */
-    sha1_update(&state->init_ctx, ipad, sizeof(ipad));
+    srtp_sha1_update(&state->init_ctx, ipad, sizeof(ipad));
     return (hmac_start(state));
 }
 
@@ -192,7 +192,7 @@ hmac_update (hmac_ctx_t *state, const ui
                 octet_string_hex_string(message, msg_octets));
 
     /* hash message into sha1 context */
-    sha1_update(&state->ctx, message, msg_octets);
+    srtp_sha1_update(&state->ctx, message, msg_octets);
 
     return err_status_ok;
 }
@@ -211,8 +211,8 @@ hmac_compute (hmac_ctx_t *state, const v
     }
 
     /* hash message, copy output into H */
-    sha1_update(&state->ctx, message, msg_octets);
-    sha1_final(&state->ctx, H);
+    srtp_sha1_update(&state->ctx, message, msg_octets);
+    srtp_sha1_final(&state->ctx, H);
 
     /*
      * note that we don't need to debug_print() the input, since the
@@ -222,16 +222,16 @@ hmac_compute (hmac_ctx_t *state, const v
                 octet_string_hex_string((uint8_t*)H, sizeof(H)));
 
     /* re-initialize hash context */
-    sha1_init(&state->ctx);
+    srtp_sha1_init(&state->ctx);
 
     /* hash opad ^ key  */
-    sha1_update(&state->ctx, (uint8_t*)state->opad, sizeof(state->opad));
+    srtp_sha1_update(&state->ctx, (uint8_t*)state->opad, sizeof(state->opad));
 
     /* hash the result of the inner hash */
-    sha1_update(&state->ctx, (uint8_t*)H, sizeof(H));
+    srtp_sha1_update(&state->ctx, (uint8_t*)H, sizeof(H));
 
     /* the result is returned in the array hash_value[] */
-    sha1_final(&state->ctx, hash_value);
+    srtp_sha1_final(&state->ctx, hash_value);
 
     /* copy hash_value to *result */
     for (i = 0; i < tag_len; i++) {