Import sha2 implementation 1.1 from Aaron D. Gifford

Update cm_sha2.[hc] from sha2.[hc] in "sha2-1.1-ALPHA.tgz" downloaded
today from

  http://www.aarongifford.com/computers/sha.html

with trivial whitespace cleanup.  This adds SHA-224 support.

Source/cm_sha2.h

@@ -1,8 +1,9 @@
 /*
- * FILE:	sha2.h
- * AUTHOR:	Aaron D. Gifford - http://www.aarongifford.com/
+ * FILE:    sha2.h
+ * AUTHOR:  Aaron D. Gifford
+ *          http://www.aarongifford.com/computers/sha.html
  *
- * Copyright (c) 2000-2001, Aaron D. Gifford
+ * Copyright (c) 2000-2003, Aaron D. Gifford
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -29,7 +30,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- * $Id: sha2.h,v 1.1 2001/11/08 00:02:01 adg Exp adg $
+ * $Id: sha2.h,v 1.4 2004/01/07 19:06:18 adg Exp $
  */
 
 #ifndef __SHA2_H__
@@ -54,27 +55,30 @@ extern "C" {
 #endif /* SHA2_USE_INTTYPES_H */
 
 
-/*** SHA-256/384/512 Various Length Definitions ***********************/
-#define SHA256_BLOCK_LENGTH		64
-#define SHA256_DIGEST_LENGTH		32
-#define SHA256_DIGEST_STRING_LENGTH	(SHA256_DIGEST_LENGTH * 2 + 1)
-#define SHA384_BLOCK_LENGTH		128
-#define SHA384_DIGEST_LENGTH		48
-#define SHA384_DIGEST_STRING_LENGTH	(SHA384_DIGEST_LENGTH * 2 + 1)
-#define SHA512_BLOCK_LENGTH		128
-#define SHA512_DIGEST_LENGTH		64
-#define SHA512_DIGEST_STRING_LENGTH	(SHA512_DIGEST_LENGTH * 2 + 1)
+/*** SHA-224/256/384/512 Various Length Definitions *******************/
 
+/* Digest lengths for SHA-1/224/256/384/512 */
+#define   SHA1_DIGEST_LENGTH          20
+#define   SHA1_DIGEST_STRING_LENGTH  (SHA1_DIGEST_LENGTH   * 2 + 1)
+#define SHA224_DIGEST_LENGTH          28
+#define SHA224_DIGEST_STRING_LENGTH  (SHA224_DIGEST_LENGTH * 2 + 1)
+#define SHA256_DIGEST_LENGTH          32
+#define SHA256_DIGEST_STRING_LENGTH  (SHA256_DIGEST_LENGTH * 2 + 1)
+#define SHA384_DIGEST_LENGTH          48
+#define SHA384_DIGEST_STRING_LENGTH  (SHA384_DIGEST_LENGTH * 2 + 1)
+#define SHA512_DIGEST_LENGTH          64
+#define SHA512_DIGEST_STRING_LENGTH  (SHA512_DIGEST_LENGTH * 2 + 1)
 
-/*** SHA-256/384/512 Context Structures *******************************/
+
+/*** SHA-224/256/384/512 Context Structures ***************************/
 /* NOTE: If your architecture does not define either u_intXX_t types or
  * uintXX_t (from inttypes.h), you may need to define things by hand
  * for your system:
  */
 #if 0
-typedef unsigned char u_int8_t;		/* 1-byte  (8-bits)  */
-typedef unsigned int u_int32_t;		/* 4-bytes (32-bits) */
-typedef unsigned long long u_int64_t;	/* 8-bytes (64-bits) */
+typedef unsigned char u_int8_t;        /* 1-byte  (8-bits)  */
+typedef unsigned int  u_int32_t;       /* 4-bytes (32-bits) */
+typedef unsigned long long u_int64_t;  /* 8-bytes (64-bits) */
 #endif
 /*
  * Most BSD systems already define u_intXX_t types, as does Linux.
@@ -94,81 +98,139 @@ typedef unsigned long long u_int64_t;	/* 8-bytes (64-bits) */
  */
 #ifdef SHA2_USE_INTTYPES_H
 
-typedef struct _SHA256_CTX {
-	uint32_t	state[8];
-	uint64_t	bitcount;
-	uint8_t	buffer[SHA256_BLOCK_LENGTH];
-} SHA256_CTX;
-typedef struct _SHA512_CTX {
-	uint64_t	state[8];
-	uint64_t	bitcount[2];
-	uint8_t	buffer[SHA512_BLOCK_LENGTH];
-} SHA512_CTX;
+typedef union _SHA_CTX {
+    /* SHA-1 uses this part of the union: */
+    struct {
+	uint32_t state[5];
+	uint64_t bitcount;
+	uint8_t	 buffer[64];
+    } s1;
+
+    /* SHA-224 and SHA-256 use this part of the union: */
+    struct {
+	uint32_t state[8];
+	uint64_t bitcount;
+	uint8_t	 buffer[64];
+    } s256;
+
+    /* SHA-384 and SHA-512 use this part of the union: */
+    struct {
+	uint64_t state[8];
+	uint64_t bitcount[2];
+	uint8_t	 buffer[128];
+    } s512;
+} SHA_CTX;
 
 #else /* SHA2_USE_INTTYPES_H */
 
-typedef struct _SHA256_CTX {
-	u_int32_t	state[8];
-	u_int64_t	bitcount;
-	u_int8_t	buffer[SHA256_BLOCK_LENGTH];
-} SHA256_CTX;
-typedef struct _SHA512_CTX {
-	u_int64_t	state[8];
-	u_int64_t	bitcount[2];
-	u_int8_t	buffer[SHA512_BLOCK_LENGTH];
-} SHA512_CTX;
+typedef union _SHA_CTX {
+    /* SHA-1 uses this part of the union: */
+    struct {
+	u_int32_t state[5];
+	u_int64_t bitcount;
+	u_int8_t  buffer[64];
+    } s1;
+
+    /* SHA-224 and SHA-256 use this part of the union: */
+    struct {
+	u_int32_t state[8];
+	u_int64_t bitcount;
+	u_int8_t  buffer[64];
+    } s256;
+
+    /* SHA-384 and SHA-512 use this part of the union: */
+    struct {
+	u_int64_t state[8];
+	u_int64_t bitcount[2];
+	u_int8_t  buffer[128];
+    } s512;
+} SHA_CTX;
 
 #endif /* SHA2_USE_INTTYPES_H */
 
-typedef SHA512_CTX SHA384_CTX;
-
 
 /*** SHA-256/384/512 Function Prototypes ******************************/
 #ifndef NOPROTO
 #ifdef SHA2_USE_INTTYPES_H
 
-void SHA256_Init(SHA256_CTX *);
-void SHA256_Update(SHA256_CTX*, const uint8_t*, size_t);
-void SHA256_Final(uint8_t[SHA256_DIGEST_LENGTH], SHA256_CTX*);
-char* SHA256_End(SHA256_CTX*, char[SHA256_DIGEST_STRING_LENGTH]);
+void SHA1_Init(SHA_CTX*);
+void SHA1_Update(SHA_CTX*, const uint8_t*, size_t);
+void SHA1_Final(uint8_t[SHA1_DIGEST_LENGTH], SHA_CTX*);
+char* SHA1_End(SHA_CTX*, char[SHA1_DIGEST_STRING_LENGTH]);
+char* SHA1_Data(const uint8_t*, size_t, char[SHA1_DIGEST_STRING_LENGTH]);
+
+void SHA224_Init(SHA_CTX*);
+void SHA224_Update(SHA_CTX*, const uint8_t*, size_t);
+void SHA224_Final(uint8_t[SHA224_DIGEST_LENGTH], SHA_CTX*);
+char* SHA224_End(SHA_CTX*, char[SHA224_DIGEST_STRING_LENGTH]);
+char* SHA224_Data(const uint8_t*, size_t, char[SHA224_DIGEST_STRING_LENGTH]);
+
+void SHA256_Init(SHA_CTX*);
+void SHA256_Update(SHA_CTX*, const uint8_t*, size_t);
+void SHA256_Final(uint8_t[SHA256_DIGEST_LENGTH], SHA_CTX*);
+char* SHA256_End(SHA_CTX*, char[SHA256_DIGEST_STRING_LENGTH]);
 char* SHA256_Data(const uint8_t*, size_t, char[SHA256_DIGEST_STRING_LENGTH]);
 
-void SHA384_Init(SHA384_CTX*);
-void SHA384_Update(SHA384_CTX*, const uint8_t*, size_t);
-void SHA384_Final(uint8_t[SHA384_DIGEST_LENGTH], SHA384_CTX*);
-char* SHA384_End(SHA384_CTX*, char[SHA384_DIGEST_STRING_LENGTH]);
+void SHA384_Init(SHA_CTX*);
+void SHA384_Update(SHA_CTX*, const uint8_t*, size_t);
+void SHA384_Final(uint8_t[SHA384_DIGEST_LENGTH], SHA_CTX*);
+char* SHA384_End(SHA_CTX*, char[SHA384_DIGEST_STRING_LENGTH]);
 char* SHA384_Data(const uint8_t*, size_t, char[SHA384_DIGEST_STRING_LENGTH]);
 
-void SHA512_Init(SHA512_CTX*);
-void SHA512_Update(SHA512_CTX*, const uint8_t*, size_t);
-void SHA512_Final(uint8_t[SHA512_DIGEST_LENGTH], SHA512_CTX*);
-char* SHA512_End(SHA512_CTX*, char[SHA512_DIGEST_STRING_LENGTH]);
+void SHA512_Init(SHA_CTX*);
+void SHA512_Update(SHA_CTX*, const uint8_t*, size_t);
+void SHA512_Final(uint8_t[SHA512_DIGEST_LENGTH], SHA_CTX*);
+char* SHA512_End(SHA_CTX*, char[SHA512_DIGEST_STRING_LENGTH]);
 char* SHA512_Data(const uint8_t*, size_t, char[SHA512_DIGEST_STRING_LENGTH]);
 
 #else /* SHA2_USE_INTTYPES_H */
 
-void SHA256_Init(SHA256_CTX *);
-void SHA256_Update(SHA256_CTX*, const u_int8_t*, size_t);
-void SHA256_Final(u_int8_t[SHA256_DIGEST_LENGTH], SHA256_CTX*);
-char* SHA256_End(SHA256_CTX*, char[SHA256_DIGEST_STRING_LENGTH]);
+void SHA1_Init(SHA_CTX*);
+void SHA1_Update(SHA_CTX*, const u_int8_t*, size_t);
+void SHA1_Final(u_int8_t[SHA1_DIGEST_LENGTH], SHA_CTX*);
+char* SHA1_End(SHA_CTX*, char[SHA1_DIGEST_STRING_LENGTH]);
+char* SHA1_Data(const u_int8_t*, size_t, char[SHA1_DIGEST_STRING_LENGTH]);
+
+void SHA224_Init(SHA_CTX*);
+void SHA224_Update(SHA_CTX*, const u_int8_t*, size_t);
+void SHA224_Final(u_int8_t[SHA224_DIGEST_LENGTH], SHA_CTX*);
+char* SHA224_End(SHA_CTX*, char[SHA224_DIGEST_STRING_LENGTH]);
+char* SHA224_Data(const u_int8_t*, size_t, char[SHA224_DIGEST_STRING_LENGTH]);
+
+void SHA256_Init(SHA_CTX*);
+void SHA256_Update(SHA_CTX*, const u_int8_t*, size_t);
+void SHA256_Final(u_int8_t[SHA256_DIGEST_LENGTH], SHA_CTX*);
+char* SHA256_End(SHA_CTX*, char[SHA256_DIGEST_STRING_LENGTH]);
 char* SHA256_Data(const u_int8_t*, size_t, char[SHA256_DIGEST_STRING_LENGTH]);
 
-void SHA384_Init(SHA384_CTX*);
-void SHA384_Update(SHA384_CTX*, const u_int8_t*, size_t);
-void SHA384_Final(u_int8_t[SHA384_DIGEST_LENGTH], SHA384_CTX*);
-char* SHA384_End(SHA384_CTX*, char[SHA384_DIGEST_STRING_LENGTH]);
+void SHA384_Init(SHA_CTX*);
+void SHA384_Update(SHA_CTX*, const u_int8_t*, size_t);
+void SHA384_Final(u_int8_t[SHA384_DIGEST_LENGTH], SHA_CTX*);
+char* SHA384_End(SHA_CTX*, char[SHA384_DIGEST_STRING_LENGTH]);
 char* SHA384_Data(const u_int8_t*, size_t, char[SHA384_DIGEST_STRING_LENGTH]);
 
-void SHA512_Init(SHA512_CTX*);
-void SHA512_Update(SHA512_CTX*, const u_int8_t*, size_t);
-void SHA512_Final(u_int8_t[SHA512_DIGEST_LENGTH], SHA512_CTX*);
-char* SHA512_End(SHA512_CTX*, char[SHA512_DIGEST_STRING_LENGTH]);
+void SHA512_Init(SHA_CTX*);
+void SHA512_Update(SHA_CTX*, const u_int8_t*, size_t);
+void SHA512_Final(u_int8_t[SHA512_DIGEST_LENGTH], SHA_CTX*);
+char* SHA512_End(SHA_CTX*, char[SHA512_DIGEST_STRING_LENGTH]);
 char* SHA512_Data(const u_int8_t*, size_t, char[SHA512_DIGEST_STRING_LENGTH]);
 
 #endif /* SHA2_USE_INTTYPES_H */
 
 #else /* NOPROTO */
 
+void SHA1_Init();
+void SHA1_Update();
+void SHA1_Final();
+char* SHA1_End();
+char* SHA1_Data();
+
+void SHA224_Init();
+void SHA224_Update();
+void SHA224_Final();
+char* SHA224_End();
+char* SHA224_Data();
+
 void SHA256_Init();
 void SHA256_Update();
 void SHA256_Final();
@@ -189,7 +251,7 @@ char* SHA512_Data();
 
 #endif /* NOPROTO */
 
-#ifdef	__cplusplus
+#ifdef    __cplusplus
 }
 #endif /* __cplusplus */