diff --git a/sha1.c b/sha1.c
index 8367c4d..c2bf174 100644
--- a/sha1.c
+++ b/sha1.c
@@ -279,3 +279,18 @@ void SHA1Final(
     memset(&finalcount, '\0', sizeof(finalcount));
 }
 
+void SHA1(
+    char *hash_out,
+    const char *str,
+    int len)
+{
+    SHA1_CTX ctx;
+    unsigned int ii;
+
+    SHA1Init(&ctx);
+    for (ii=0; ii<len; ii+=1)
+        SHA1Update(&ctx, (const unsigned char*)str + ii, 1);
+    SHA1Final((unsigned char *)hash_out, &ctx);
+    hash_out[20] = '\0';
+}
+
diff --git a/sha1.h b/sha1.h
index e3b89d8..001a8ab 100644
--- a/sha1.h
+++ b/sha1.h
@@ -2,10 +2,10 @@
 #define SHA1_H
 
 /*
-SHA-1 in C
-By Steve Reid <steve@edmweb.com>
-100% Public Domain
-*/
+   SHA-1 in C
+   By Steve Reid <steve@edmweb.com>
+   100% Public Domain
+ */
 
 typedef struct
 {
@@ -17,21 +17,26 @@ typedef struct
 void SHA1Transform(
     uint32_t state[5],
     const unsigned char buffer[64]
-);
+    );
 
 void SHA1Init(
     SHA1_CTX * context
-);
+    );
 
 void SHA1Update(
     SHA1_CTX * context,
     const unsigned char *data,
     uint32_t len
-);
+    );
 
 void SHA1Final(
     unsigned char digest[20],
     SHA1_CTX * context
-);
+    );
+
+void SHA1(
+    char *hash_out,
+    const char *str,
+    int len);
 
 #endif /* SHA1_H */