commit d92e8f3f25e38a92f2f558f0ec0dd6087f633dfd
Author: Jared Jennings <jared.jennings.ctr@us.af.mil>
Date:   Thu Mar 27 16:12:21 2014 -0500

    make built-in digest function implementations indicate success or failure of init and final functions

diff --git a/ext/digest/md5/md5.c b/ext/digest/md5/md5.c
index 1d34e09..f754ab1 100644
--- a/ext/digest/md5/md5.c
+++ b/ext/digest/md5/md5.c
@@ -350,7 +350,7 @@ md5_process(MD5_CTX *pms, const uint8_t *data /*[64]*/)
     pms->state[3] += d;
 }
 
-void
+int
 MD5_Init(MD5_CTX *pms)
 {
     pms->count[0] = pms->count[1] = 0;
@@ -358,6 +358,7 @@ MD5_Init(MD5_CTX *pms)
     pms->state[1] = /*0xefcdab89*/ T_MASK ^ 0x10325476;
     pms->state[2] = /*0x98badcfe*/ T_MASK ^ 0x67452301;
     pms->state[3] = 0x10325476;
+    return 1;
 }
 
 void
@@ -398,7 +399,7 @@ MD5_Update(MD5_CTX *pms, const uint8_t *data, size_t nbytes)
 	memcpy(pms->buffer, p, left);
 }
 
-void
+int
 MD5_Finish(MD5_CTX *pms, uint8_t *digest)
 {
     static const uint8_t pad[64] = {
@@ -419,4 +420,5 @@ MD5_Finish(MD5_CTX *pms, uint8_t *digest)
     MD5_Update(pms, data, 8);
     for (i = 0; i < 16; ++i)
 	digest[i] = (uint8_t)(pms->state[i >> 2] >> ((i & 3) << 3));
+    return 1;
 }
diff --git a/ext/digest/md5/md5.h b/ext/digest/md5/md5.h
index ec2101f..69a1565 100644
--- a/ext/digest/md5/md5.h
+++ b/ext/digest/md5/md5.h
@@ -69,9 +69,9 @@ typedef struct md5_state_s {
 #define MD5_Finish	rb_Digest_MD5_Finish
 #endif
 
-void	MD5_Init _((MD5_CTX *pms));
+int	MD5_Init _((MD5_CTX *pms));
 void	MD5_Update _((MD5_CTX *pms, const uint8_t *data, size_t nbytes));
-void	MD5_Finish _((MD5_CTX *pms, uint8_t *digest));
+int	MD5_Finish _((MD5_CTX *pms, uint8_t *digest));
 
 #define MD5_BLOCK_LENGTH		64
 #define MD5_DIGEST_LENGTH		16
diff --git a/ext/digest/rmd160/rmd160.c b/ext/digest/rmd160/rmd160.c
index 6d38a49..7c2ae58 100644
--- a/ext/digest/rmd160/rmd160.c
+++ b/ext/digest/rmd160/rmd160.c
@@ -124,7 +124,7 @@
 
 /********************************************************************/
 
-void
+int
 RMD160_Init(RMD160_CTX *context)
 {
 
@@ -138,6 +138,7 @@ RMD160_Init(RMD160_CTX *context)
 	context->state[4] = 0xc3d2e1f0U;
 	context->length[0] = context->length[1] = 0;
 	context->buflen = 0;
+	return 1;
 }
 
 /********************************************************************/
@@ -412,7 +413,7 @@ RMD160_Update(RMD160_CTX *context, const uint8_t *data, size_t nbytes)
 
 /********************************************************************/
 
-void
+int
 RMD160_Finish(RMD160_CTX *context, uint8_t digest[20])
 {
 	uint32_t i;
@@ -456,6 +457,7 @@ RMD160_Finish(RMD160_CTX *context, uint8_t digest[20])
 			digest[i + 3] = (context->state[i>>2] >> 24);
 		}
 	}
+	return 1;
 }
 
 /************************ end of file rmd160.c **********************/
diff --git a/ext/digest/rmd160/rmd160.h b/ext/digest/rmd160/rmd160.h
index 9022642..f6fa1e8 100644
--- a/ext/digest/rmd160/rmd160.h
+++ b/ext/digest/rmd160/rmd160.h
@@ -43,10 +43,10 @@ typedef struct {
 #endif
 
 __BEGIN_DECLS
-void	RMD160_Init _((RMD160_CTX *));
+int	RMD160_Init _((RMD160_CTX *));
 void	RMD160_Transform _((uint32_t[5], const uint32_t[16]));
 void	RMD160_Update _((RMD160_CTX *, const uint8_t *, size_t));
-void	RMD160_Finish _((RMD160_CTX *, uint8_t[20]));
+int	RMD160_Finish _((RMD160_CTX *, uint8_t[20]));
 __END_DECLS
 
 #define RMD160_BLOCK_LENGTH             64
diff --git a/ext/digest/sha1/sha1.c b/ext/digest/sha1/sha1.c
index 3e01a7b..cf1d375 100644
--- a/ext/digest/sha1/sha1.c
+++ b/ext/digest/sha1/sha1.c
@@ -199,7 +199,7 @@ void SHA1_Transform(uint32_t state[5], const uint8_t buffer[64])
 /*
  * SHA1_Init - Initialize new context
  */
-void SHA1_Init(SHA1_CTX *context)
+int SHA1_Init(SHA1_CTX *context)
 {
 
     _DIAGASSERT(context != 0);
@@ -211,6 +211,7 @@ void SHA1_Init(SHA1_CTX *context)
     context->state[3] = 0x10325476;
     context->state[4] = 0xC3D2E1F0;
     context->count[0] = context->count[1] = 0;
+    return 1;
 }
 
 
@@ -244,7 +245,7 @@ void SHA1_Update(SHA1_CTX *context, const uint8_t *data, size_t len)
 /*
  * Add padding and return the message digest.
  */
-void SHA1_Finish(SHA1_CTX* context, uint8_t digest[20])
+int SHA1_Finish(SHA1_CTX* context, uint8_t digest[20])
 {
     size_t i;
     uint8_t finalcount[8];
@@ -266,4 +267,5 @@ void SHA1_Finish(SHA1_CTX* context, uint8_t digest[20])
 	    digest[i] = (uint8_t)
 		((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
     }
+    return 1;
 }
diff --git a/ext/digest/sha1/sha1.h b/ext/digest/sha1/sha1.h
index 0f7ffda..02dbec6 100644
--- a/ext/digest/sha1/sha1.h
+++ b/ext/digest/sha1/sha1.h
@@ -28,9 +28,9 @@ typedef struct {
 #endif
 
 void	SHA1_Transform _((uint32_t state[5], const uint8_t buffer[64]));
-void	SHA1_Init _((SHA1_CTX *context));
+int	SHA1_Init _((SHA1_CTX *context));
 void	SHA1_Update _((SHA1_CTX *context, const uint8_t *data, size_t len));
-void	SHA1_Finish _((SHA1_CTX *context, uint8_t digest[20]));
+int	SHA1_Finish _((SHA1_CTX *context, uint8_t digest[20]));
 
 #define SHA1_BLOCK_LENGTH		64
 #define SHA1_DIGEST_LENGTH		20
diff --git a/ext/digest/sha2/sha2.c b/ext/digest/sha2/sha2.c
index 99615ae..1bae1be 100644
--- a/ext/digest/sha2/sha2.c
+++ b/ext/digest/sha2/sha2.c
@@ -341,13 +341,14 @@ static const char *sha2_hex_digits = "0123456789abcdef";
 
 
 /*** SHA-256: *********************************************************/
-void SHA256_Init(SHA256_CTX* context) {
+int SHA256_Init(SHA256_CTX* context) {
 	if (context == (SHA256_CTX*)0) {
-		return;
+	  return 0;
 	}
 	MEMCPY_BCOPY(context->state, sha256_initial_hash_value, SHA256_DIGEST_LENGTH);
 	MEMSET_BZERO(context->buffer, SHA256_BLOCK_LENGTH);
 	context->bitcount = 0;
+	return 1;
 }
 
 #ifdef SHA2_UNROLL_TRANSFORM
@@ -574,7 +575,7 @@ void SHA256_Update(SHA256_CTX* context, const sha2_byte *data, size_t len) {
 	usedspace = freespace = 0;
 }
 
-void SHA256_Final(sha2_byte digest[], SHA256_CTX* context) {
+int SHA256_Final(sha2_byte digest[], SHA256_CTX* context) {
 	sha2_word32	*d = (sha2_word32*)digest;
 	unsigned int	usedspace;
 
@@ -636,6 +637,7 @@ void SHA256_Final(sha2_byte digest[], SHA256_CTX* context) {
 	/* Clean up state data: */
 	MEMSET_BZERO(context, sizeof(*context));
 	usedspace = 0;
+	return 1;
 }
 
 char *SHA256_End(SHA256_CTX* context, char buffer[]) {
@@ -670,13 +672,14 @@ char* SHA256_Data(const sha2_byte* data, size_t len, char digest[SHA256_DIGEST_S
 
 
 /*** SHA-512: *********************************************************/
-void SHA512_Init(SHA512_CTX* context) {
+int SHA512_Init(SHA512_CTX* context) {
 	if (context == (SHA512_CTX*)0) {
-		return;
+	  return 0;
 	}
 	MEMCPY_BCOPY(context->state, sha512_initial_hash_value, SHA512_DIGEST_LENGTH);
 	MEMSET_BZERO(context->buffer, SHA512_BLOCK_LENGTH);
 	context->bitcount[0] = context->bitcount[1] =  0;
+	return 1;
 }
 
 #ifdef SHA2_UNROLL_TRANSFORM
@@ -940,7 +943,7 @@ void SHA512_Last(SHA512_CTX* context) {
 	SHA512_Transform(context, (sha2_word64*)context->buffer);
 }
 
-void SHA512_Final(sha2_byte digest[], SHA512_CTX* context) {
+int SHA512_Final(sha2_byte digest[], SHA512_CTX* context) {
 	sha2_word64	*d = (sha2_word64*)digest;
 
 	/* Sanity check: */
@@ -967,6 +970,7 @@ void SHA512_Final(sha2_byte digest[], SHA512_CTX* context) {
 
 	/* Zero out state data */
 	MEMSET_BZERO(context, sizeof(*context));
+	return 1;
 }
 
 char *SHA512_End(SHA512_CTX* context, char buffer[]) {
@@ -1001,20 +1005,21 @@ char* SHA512_Data(const sha2_byte* data, size_t len, char digest[SHA512_DIGEST_S
 
 
 /*** SHA-384: *********************************************************/
-void SHA384_Init(SHA384_CTX* context) {
+int SHA384_Init(SHA384_CTX* context) {
 	if (context == (SHA384_CTX*)0) {
-		return;
+	  return 0;
 	}
 	MEMCPY_BCOPY(context->state, sha384_initial_hash_value, SHA512_DIGEST_LENGTH);
 	MEMSET_BZERO(context->buffer, SHA384_BLOCK_LENGTH);
 	context->bitcount[0] = context->bitcount[1] = 0;
+	return 1;
 }
 
 void SHA384_Update(SHA384_CTX* context, const sha2_byte* data, size_t len) {
 	SHA512_Update((SHA512_CTX*)context, data, len);
 }
 
-void SHA384_Final(sha2_byte digest[], SHA384_CTX* context) {
+int SHA384_Final(sha2_byte digest[], SHA384_CTX* context) {
 	sha2_word64	*d = (sha2_word64*)digest;
 
 	/* Sanity check: */
@@ -1041,6 +1046,7 @@ void SHA384_Final(sha2_byte digest[], SHA384_CTX* context) {
 
 	/* Zero out state data */
 	MEMSET_BZERO(context, sizeof(*context));
+	return 1;
 }
 
 char *SHA384_End(SHA384_CTX* context, char buffer[]) {
diff --git a/ext/digest/sha2/sha2.h b/ext/digest/sha2/sha2.h
index ade0011..a80170e 100644
--- a/ext/digest/sha2/sha2.h
+++ b/ext/digest/sha2/sha2.h
@@ -165,52 +165,52 @@ typedef SHA512_CTX SHA384_CTX;
 
 #ifndef NOPROTO
 
-void SHA256_Init(SHA256_CTX *);
+int SHA256_Init(SHA256_CTX *);
 void SHA256_Update(SHA256_CTX*, const uint8_t*, size_t);
-void SHA256_Final(uint8_t[SHA256_DIGEST_LENGTH], SHA256_CTX*);
+int SHA256_Final(uint8_t[SHA256_DIGEST_LENGTH], SHA256_CTX*);
 char* SHA256_End(SHA256_CTX*, char[SHA256_DIGEST_STRING_LENGTH]);
 char* SHA256_Data(const uint8_t*, size_t, char[SHA256_DIGEST_STRING_LENGTH]);
 
-void SHA384_Init(SHA384_CTX*);
+int SHA384_Init(SHA384_CTX*);
 void SHA384_Update(SHA384_CTX*, const uint8_t*, size_t);
-void SHA384_Final(uint8_t[SHA384_DIGEST_LENGTH], SHA384_CTX*);
+int SHA384_Final(uint8_t[SHA384_DIGEST_LENGTH], SHA384_CTX*);
 char* SHA384_End(SHA384_CTX*, char[SHA384_DIGEST_STRING_LENGTH]);
 char* SHA384_Data(const uint8_t*, size_t, char[SHA384_DIGEST_STRING_LENGTH]);
 
-void SHA512_Init(SHA512_CTX*);
+int SHA512_Init(SHA512_CTX*);
 void SHA512_Update(SHA512_CTX*, const uint8_t*, size_t);
-void SHA512_Final(uint8_t[SHA512_DIGEST_LENGTH], SHA512_CTX*);
+int SHA512_Final(uint8_t[SHA512_DIGEST_LENGTH], SHA512_CTX*);
 char* SHA512_End(SHA512_CTX*, char[SHA512_DIGEST_STRING_LENGTH]);
 char* SHA512_Data(const uint8_t*, size_t, char[SHA512_DIGEST_STRING_LENGTH]);
 
 #else /* NOPROTO */
 
-void SHA256_Init();
+int SHA256_Init();
 void SHA256_Update();
 #ifdef RUBY
-void SHA256_Finish();
+int SHA256_Finish();
 #else
-void SHA256_Final();
+int SHA256_Final();
 #endif /* RUBY */
 char* SHA256_End();
 char* SHA256_Data();
 
-void SHA384_Init();
+int SHA384_Init();
 void SHA384_Update();
 #ifdef RUBY
-void SHA384_Finish();
+int SHA384_Finish();
 #else
-void SHA384_Final();
+int SHA384_Final();
 #endif /* RUBY */
 char* SHA384_End();
 char* SHA384_Data();
 
-void SHA512_Init();
+int SHA512_Init();
 void SHA512_Update();
 #ifdef RUBY
-void SHA512_Finish();
+int SHA512_Finish();
 #else
-void SHA512_Final();
+int SHA512_Final();
 #endif /* RUBY */
 char* SHA512_End();
 char* SHA512_Data();