diff --git a/libc/include/sha1.h b/libc/include/sha1.h
index bc51ac0..adfa1fc 100644
--- a/libc/include/sha1.h
+++ b/libc/include/sha1.h
@@ -13,17 +13,16 @@
 #include <sys/types.h>
 
 #define SHA1_DIGEST_LENGTH		20
-#define SHA1_BLOCK_SIZE 		64
+#define SHA1_DIGEST_STRING_LENGTH	41
 
 typedef struct {
-    uint64_t count;
-    uint32_t state[SHA1_DIGEST_LENGTH / 4];
-    uint8_t buffer[SHA1_BLOCK_SIZE];
+	uint32_t state[5];
+	uint32_t count[2];
+	uint8_t buffer[64];
 } SHA1_CTX;
 
 __BEGIN_DECLS
-void	SHA1Transform(uint32_t[SHA1_DIGEST_LENGTH/4],
-	              const uint8_t[SHA1_BLOCK_SIZE]);
+void	SHA1Transform(uint32_t[5], const uint8_t[64]);
 void	SHA1Init(SHA1_CTX *);
 void	SHA1Update(SHA1_CTX *, const uint8_t *, unsigned int);
 void	SHA1Final(uint8_t[SHA1_DIGEST_LENGTH], SHA1_CTX *);