diff --git a/include/mbedtls/sha1.h b/include/mbedtls/sha1.h
index 7a67c6c..9dde5b8 100644
--- a/include/mbedtls/sha1.h
+++ b/include/mbedtls/sha1.h
@@ -32,6 +32,11 @@
 #include <stddef.h>
 #include <stdint.h>
 
+#if ( defined(__ARMCC_VERSION) || defined(_MSC_VER) ) && \
+    !defined(inline) && !defined(__cplusplus)
+#define inline __inline
+#endif
+
 #if !defined(MBEDTLS_SHA1_ALT)
 // Regular implementation
 //
@@ -78,8 +83,10 @@
  * \brief          SHA-1 context setup
  *
  * \param ctx      context to be initialized
+ *
+ * \return         0 if successful
  */
-void mbedtls_sha1_starts( mbedtls_sha1_context *ctx );
+int mbedtls_sha1_starts_ext( mbedtls_sha1_context *ctx );
 
 /**
  * \brief          SHA-1 process buffer
@@ -87,19 +94,103 @@
  * \param ctx      SHA-1 context
  * \param input    buffer holding the  data
  * \param ilen     length of the input data
+ *
+ * \return         0 if successful
  */
-void mbedtls_sha1_update( mbedtls_sha1_context *ctx, const unsigned char *input, size_t ilen );
+int mbedtls_sha1_update_ext( mbedtls_sha1_context *ctx,
+                             const unsigned char *input,
+                             size_t ilen );
 
 /**
  * \brief          SHA-1 final digest
  *
  * \param ctx      SHA-1 context
  * \param output   SHA-1 checksum result
+ *
+ * \return         0 if successful
  */
-void mbedtls_sha1_finish( mbedtls_sha1_context *ctx, unsigned char output[20] );
+int mbedtls_sha1_finish_ext( mbedtls_sha1_context *ctx,
+                             unsigned char output[20] );
 
-/* Internal use */
-void mbedtls_sha1_process( mbedtls_sha1_context *ctx, const unsigned char data[64] );
+/**
+ * \brief          SHA-1 process data block (internal use only)
+ *
+ * \param ctx      SHA-1 context
+ * \param data     buffer holding one block of data
+ *
+ * \return         0 if successful
+ */
+int mbedtls_sha1_process_ext( mbedtls_sha1_context *ctx,
+                              const unsigned char data[64] );
+
+#if !defined(MBEDTLS_DEPRECATED_REMOVED)
+#if defined(MBEDTLS_DEPRECATED_WARNING)
+#define MBEDTLS_DEPRECATED      __attribute__((deprecated))
+#else
+#define MBEDTLS_DEPRECATED
+#endif
+/**
+ * \brief          SHA-1 context setup
+ *
+ * \deprecated     Superseded by mbedtls_sha1_starts_ext() in 2.5.0
+ *
+ * \param ctx      context to be initialized
+ */
+MBEDTLS_DEPRECATED static inline void mbedtls_sha1_starts(
+                                                mbedtls_sha1_context *ctx )
+{
+    mbedtls_sha1_starts_ext( ctx );
+}
+
+/**
+ * \brief          SHA-1 process buffer
+ *
+ * \deprecated     Superseded by mbedtls_sha1_update_ext() in 2.5.0
+ *
+ * \param ctx      SHA-1 context
+ * \param input    buffer holding the  data
+ * \param ilen     length of the input data
+ */
+MBEDTLS_DEPRECATED static inline void mbedtls_sha1_update(
+                                                mbedtls_sha1_context *ctx,
+                                                const unsigned char *input,
+                                                size_t ilen )
+{
+    mbedtls_sha1_update_ext( ctx, input, ilen );
+}
+
+/**
+ * \brief          SHA-1 final digest
+ *
+ * \deprecated     Superseded by mbedtls_sha1_finish_ext() in 2.5.0
+ *
+ * \param ctx      SHA-1 context
+ * \param output   SHA-1 checksum result
+ */
+MBEDTLS_DEPRECATED static inline void mbedtls_sha1_finish(
+                                                mbedtls_sha1_context *ctx,
+                                                unsigned char output[20] )
+{
+    mbedtls_sha1_finish_ext( ctx, output );
+}
+
+/**
+ * \brief          SHA-1 process data block (internal use only)
+ *
+ * \deprecated     Superseded by mbedtls_sha1_process_ext() in 2.5.0
+ *
+ * \param ctx      SHA-1 context
+ * \param data     buffer holding one block of data
+ */
+MBEDTLS_DEPRECATED static inline void mbedtls_sha1_process(
+                                                mbedtls_sha1_context *ctx,
+                                                const unsigned char data[64] )
+{
+    mbedtls_sha1_process_ext( ctx, data );
+}
+
+#undef MBEDTLS_DEPRECATED
+#endif /* !MBEDTLS_DEPRECATED_REMOVED */
 
 #ifdef __cplusplus
 }
@@ -119,8 +210,37 @@
  * \param input    buffer holding the  data
  * \param ilen     length of the input data
  * \param output   SHA-1 checksum result
+ *
+ * \return         0 if successful
  */
-void mbedtls_sha1( const unsigned char *input, size_t ilen, unsigned char output[20] );
+int mbedtls_sha1_ext( const unsigned char *input,
+                      size_t ilen,
+                      unsigned char output[20] );
+
+#if !defined(MBEDTLS_DEPRECATED_REMOVED)
+#if defined(MBEDTLS_DEPRECATED_WARNING)
+#define MBEDTLS_DEPRECATED      __attribute__((deprecated))
+#else
+#define MBEDTLS_DEPRECATED
+#endif
+/**
+ * \brief          Output = SHA-1( input buffer )
+ *
+ * \deprecated     Superseded by mbedtls_sha1_ext() in 2.5.0
+ *
+ * \param input    buffer holding the  data
+ * \param ilen     length of the input data
+ * \param output   SHA-1 checksum result
+ */
+MBEDTLS_DEPRECATED static inline void mbedtls_sha1( const unsigned char *input,
+                                                    size_t ilen,
+                                                    unsigned char output[20] )
+{
+    mbedtls_sha1_ext( input, ilen, output );
+}
+
+#undef MBEDTLS_DEPRECATED
+#endif /* !MBEDTLS_DEPRECATED_REMOVED */
 
 /**
  * \brief          Checkup routine
diff --git a/library/sha1.c b/library/sha1.c
index 2ccf2a2..d2ec8ba 100644
--- a/library/sha1.c
+++ b/library/sha1.c
@@ -97,7 +97,7 @@
 /*
  * SHA-1 context setup
  */
-void mbedtls_sha1_starts( mbedtls_sha1_context *ctx )
+int mbedtls_sha1_starts_ext( mbedtls_sha1_context *ctx )
 {
     ctx->total[0] = 0;
     ctx->total[1] = 0;
@@ -107,10 +107,13 @@
     ctx->state[2] = 0x98BADCFE;
     ctx->state[3] = 0x10325476;
     ctx->state[4] = 0xC3D2E1F0;
+
+    return( 0 );
 }
 
 #if !defined(MBEDTLS_SHA1_PROCESS_ALT)
-void mbedtls_sha1_process( mbedtls_sha1_context *ctx, const unsigned char data[64] )
+int mbedtls_sha1_process_ext( mbedtls_sha1_context *ctx,
+                              const unsigned char data[64] )
 {
     uint32_t temp, W[16], A, B, C, D, E;
 
@@ -264,19 +267,24 @@
     ctx->state[2] += C;
     ctx->state[3] += D;
     ctx->state[4] += E;
+
+    return( 0 );
 }
 #endif /* !MBEDTLS_SHA1_PROCESS_ALT */
 
 /*
  * SHA-1 process buffer
  */
-void mbedtls_sha1_update( mbedtls_sha1_context *ctx, const unsigned char *input, size_t ilen )
+int mbedtls_sha1_update_ext( mbedtls_sha1_context *ctx,
+                             const unsigned char *input,
+                             size_t ilen )
 {
+    int ret;
     size_t fill;
     uint32_t left;
 
     if( ilen == 0 )
-        return;
+        return( 0 );
 
     left = ctx->total[0] & 0x3F;
     fill = 64 - left;
@@ -290,7 +298,10 @@
     if( left && ilen >= fill )
     {
         memcpy( (void *) (ctx->buffer + left), input, fill );
-        mbedtls_sha1_process( ctx, ctx->buffer );
+
+        if( ( ret = mbedtls_sha1_process_ext( ctx, ctx->buffer ) ) != 0 )
+            return( ret );
+
         input += fill;
         ilen  -= fill;
         left = 0;
@@ -298,13 +309,17 @@
 
     while( ilen >= 64 )
     {
-        mbedtls_sha1_process( ctx, input );
+        if( ( ret = mbedtls_sha1_process_ext( ctx, input ) ) != 0 )
+            return( ret );
+
         input += 64;
         ilen  -= 64;
     }
 
     if( ilen > 0 )
         memcpy( (void *) (ctx->buffer + left), input, ilen );
+
+    return( 0 );
 }
 
 static const unsigned char sha1_padding[64] =
@@ -318,8 +333,10 @@
 /*
  * SHA-1 final digest
  */
-void mbedtls_sha1_finish( mbedtls_sha1_context *ctx, unsigned char output[20] )
+int mbedtls_sha1_finish_ext( mbedtls_sha1_context *ctx,
+                             unsigned char output[20] )
 {
+    int ret;
     uint32_t last, padn;
     uint32_t high, low;
     unsigned char msglen[8];
@@ -334,14 +351,18 @@
     last = ctx->total[0] & 0x3F;
     padn = ( last < 56 ) ? ( 56 - last ) : ( 120 - last );
 
-    mbedtls_sha1_update( ctx, sha1_padding, padn );
-    mbedtls_sha1_update( ctx, msglen, 8 );
+    if( ( ret = mbedtls_sha1_update_ext( ctx, sha1_padding, padn ) ) != 0 )
+        return( ret );
+    if( ( ret = mbedtls_sha1_update_ext( ctx, msglen, 8 ) ) != 0 )
+        return( ret );
 
     PUT_UINT32_BE( ctx->state[0], output,  0 );
     PUT_UINT32_BE( ctx->state[1], output,  4 );
     PUT_UINT32_BE( ctx->state[2], output,  8 );
     PUT_UINT32_BE( ctx->state[3], output, 12 );
     PUT_UINT32_BE( ctx->state[4], output, 16 );
+
+    return( 0 );
 }
 
 #endif /* !MBEDTLS_SHA1_ALT */
@@ -349,15 +370,27 @@
 /*
  * output = SHA-1( input buffer )
  */
-void mbedtls_sha1( const unsigned char *input, size_t ilen, unsigned char output[20] )
+int mbedtls_sha1_ext( const unsigned char *input,
+                      size_t ilen,
+                      unsigned char output[20] )
 {
+    int ret;
     mbedtls_sha1_context ctx;
 
     mbedtls_sha1_init( &ctx );
-    mbedtls_sha1_starts( &ctx );
-    mbedtls_sha1_update( &ctx, input, ilen );
-    mbedtls_sha1_finish( &ctx, output );
+
+    if( ( ret = mbedtls_sha1_starts_ext( &ctx ) ) != 0 )
+        return( ret );
+
+    if( ( ret = mbedtls_sha1_update_ext( &ctx, input, ilen ) ) != 0 )
+        return( ret );
+
+    if( ( ret = mbedtls_sha1_finish_ext( &ctx, output ) ) != 0 )
+        return( ret );
+
     mbedtls_sha1_free( &ctx );
+
+    return( 0 );
 }
 
 #if defined(MBEDTLS_SELF_TEST)
@@ -406,29 +439,30 @@
         if( verbose != 0 )
             mbedtls_printf( "  SHA-1 test #%d: ", i + 1 );
 
-        mbedtls_sha1_starts( &ctx );
+        if( mbedtls_sha1_starts_ext( &ctx ) != 0 )
+            goto fail;
 
         if( i == 2 )
         {
             memset( buf, 'a', buflen = 1000 );
 
             for( j = 0; j < 1000; j++ )
-                mbedtls_sha1_update( &ctx, buf, buflen );
+            {
+                if( mbedtls_sha1_update_ext( &ctx, buf, buflen ) != 0 )
+                    goto fail;
+            }
         }
         else
-            mbedtls_sha1_update( &ctx, sha1_test_buf[i],
-                               sha1_test_buflen[i] );
+        {
+            if( mbedtls_sha1_update_ext( &ctx, sha1_test_buf[i],
+                                         sha1_test_buflen[i] ) != 0 )
+                goto fail;
+        }
 
-        mbedtls_sha1_finish( &ctx, sha1sum );
+        mbedtls_sha1_finish_ext( &ctx, sha1sum );
 
         if( memcmp( sha1sum, sha1_test_sum[i], 20 ) != 0 )
-        {
-            if( verbose != 0 )
-                mbedtls_printf( "failed\n" );
-
-            ret = 1;
             goto exit;
-        }
 
         if( verbose != 0 )
             mbedtls_printf( "passed\n" );
@@ -437,6 +471,14 @@
     if( verbose != 0 )
         mbedtls_printf( "\n" );
 
+    goto exit;
+
+fail:
+    if( verbose != 0 )
+        mbedtls_printf( "failed\n" );
+
+    ret = 1;
+
 exit:
     mbedtls_sha1_free( &ctx );