Land https://codereview.chromium.org/889083003/ to update libsrtp to upstream 1.5.0

srtp/crypto/include/sha1.h

 /*
  * sha1.h
  *
  * interface to the Secure Hash Algorithm v.1 (SHA-1), specified in
  * FIPS 180-1
  *
  * David A. McGrew
  * Cisco Systems, Inc.
  */
 
@@ skipping 30 matching lines @@
  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  * OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  */
 
 #ifndef SHA1_H
 #define SHA1_H
 
 #include "err.h"
+#ifdef OPENSSL
+#include <openssl/evp.h>
+#include <stdint.h>
+
+typedef EVP_MD_CTX sha1_ctx_t;
+
+/*
+ * sha1_init(&ctx) initializes the SHA1 context ctx
+ *
+ * sha1_update(&ctx, msg, len) hashes the len octets starting at msg
+ * into the SHA1 context
+ *
+ * sha1_final(&ctx, output) performs the final processing of the SHA1
+ * context and writes the result to the 20 octets at output
+ *
+ * Return values are ignored on the EVP functions since all three
+ * of these functions return void.
+ *
+ */
+
+static inline void 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)
+{
+    EVP_DigestUpdate(ctx, M, octets_in_msg);
+}
+
+static inline void sha1_final (sha1_ctx_t *ctx, uint32_t *output)
+{
+    unsigned int len = 0;
+
+    EVP_DigestFinal(ctx, (unsigned char*)output, &len);
+}
+#else
 #include "datatypes.h"
 
 typedef struct {
   uint32_t H[5];             /* state vector                    */
   uint32_t M[16];            /* message buffer                  */
   int octets_in_buffer;      /* octets of message in buffer     */
   uint32_t num_bits_in_msg;  /* total number of bits in message */
 } sha1_ctx_t;
 
 /*
@@ skipping 36 matching lines @@
  *  sha1_core(M, H) computes the core sha1 compression function, where M is
  *  the next part of the message and H is the intermediate state {H0,
  *  H1, ...}
  *
  *  this function does not do any of the padding required in the
  *  complete sha1 function
  */
 
 void
 sha1_core(const uint32_t M[16], uint32_t hash_value[5]);
+
+#endif /* else OPENSSL */
      
 #endif /* SHA1_H */