Add new function, EVP_MD_CTX_copy() to replace frequent use of memcpy.

Submitted by: Eric A Young - from changes to C2Net SSLeay
Reviewed by: Mark Cox
PR:

CHANGES

@@ -5,6 +5,9 @@
 
  Changes between 0.9.1c and 0.9.2
 
+  *) Add new function, EVP_MD_CTX_copy() to replace frequent use of memcpy.
+     [Eric A. Young, (from changes to C2Net SSLeay, integrated by Mark Cox)]
+
   *) Make sure `make rehash' target really finds the `openssl' program.
      [Ralf S. Engelschall, Matthias Loepfe <Matthias.Loepfe@adnovum.ch>]
 

crypto/evp/digest.c

@@ -87,3 +87,13 @@ unsigned int *size;
 		*size=ctx->digest->md_size;
 	memset(&(ctx->md),0,sizeof(ctx->md));
 	}
+
+int EVP_MD_CTX_copy(EVP_MD_CTX *out, EVP_MD_CTX *in)
+{
+    if ((in == NULL) || (in->digest == NULL)) {
+        EVPerr(EVP_F_EVP_MD_CTX_COPY,EVP_R_INPUT_NOT_INITALISED);
+	return 0;
+    }
+    memcpy((char *)out,(char *)in,in->digest->ctx_size);
+    return 1;
+}    

crypto/evp/evp.err

@@ -11,6 +11,7 @@
 #define EVP_F_EVP_SIGNFINAL				 107
 #define EVP_F_EVP_VERIFYFINAL				 108
 #define EVP_F_RC2_MAGIC_TO_METH				 109
+#define EVP_F_EVP_MD_CTX_COPY                            110
 
 /* Reason codes. */
 #define EVP_R_BAD_DECRYPT				 100
@@ -24,3 +25,4 @@
 #define EVP_R_UNSUPPORTED_KEY_SIZE			 108
 #define EVP_R_WRONG_FINAL_BLOCK_LENGTH			 109
 #define EVP_R_WRONG_PUBLIC_KEY_TYPE			 110
+#define EVP_R_INPUT_NOT_INITALISED                       111

crypto/evp/evp.h

@@ -460,6 +460,7 @@ typedef struct evp_Encode_Ctx_st
 
 #ifndef NOPROTO
 
+int     EVP_MD_CTX_copy(EVP_MD_CTX *out,EVP_MD_CTX *in);  
 void	EVP_DigestInit(EVP_MD_CTX *ctx, EVP_MD *type);
 void	EVP_DigestUpdate(EVP_MD_CTX *ctx,unsigned char *d,unsigned int cnt);
 void	EVP_DigestFinal(EVP_MD_CTX *ctx,unsigned char *md,unsigned int *s);
@@ -626,6 +627,7 @@ int EVP_CIPHER_get_asn1_iv(EVP_CIPHER_CTX *c,ASN1_TYPE *type);
 
 #else
 
+int     EVP_MD_CTX_copy(); 
 void	EVP_DigestInit();
 void	EVP_DigestUpdate();
 void	EVP_DigestFinal();
@@ -782,6 +784,7 @@ int EVP_CIPHER_get_asn1_iv();
 #define EVP_F_EVP_SIGNFINAL				 107
 #define EVP_F_EVP_VERIFYFINAL				 108
 #define EVP_F_RC2_MAGIC_TO_METH				 109
+#define EVP_F_EVP_MD_CTX_COPY                            110
 
 /* Reason codes. */
 #define EVP_R_BAD_DECRYPT				 100
@@ -795,6 +798,7 @@ int EVP_CIPHER_get_asn1_iv();
 #define EVP_R_UNSUPPORTED_KEY_SIZE			 108
 #define EVP_R_WRONG_FINAL_BLOCK_LENGTH			 109
 #define EVP_R_WRONG_PUBLIC_KEY_TYPE			 110
+#define EVP_R_INPUT_NOT_INITALISED                       111
  
 #ifdef  __cplusplus
 }

crypto/evp/evp_err.c

@@ -73,6 +73,7 @@ static ERR_STRING_DATA EVP_str_functs[]=
 {ERR_PACK(0,EVP_F_EVP_SIGNFINAL,0),	"EVP_SignFinal"},
 {ERR_PACK(0,EVP_F_EVP_VERIFYFINAL,0),	"EVP_VerifyFinal"},
 {ERR_PACK(0,EVP_F_RC2_MAGIC_TO_METH,0),	"RC2_MAGIC_TO_METH"},
+{ERR_PACK(0,EVP_F_EVP_MD_CTX_COPY,0),	"EVP_MD_CTX_copy"},
 {0,NULL},
 	};
 
@@ -89,6 +90,7 @@ static ERR_STRING_DATA EVP_str_reasons[]=
 {EVP_R_UNSUPPORTED_KEY_SIZE              ,"unsupported key size"},
 {EVP_R_WRONG_FINAL_BLOCK_LENGTH          ,"wrong final block length"},
 {EVP_R_WRONG_PUBLIC_KEY_TYPE             ,"wrong public key type"},
+{EVP_R_INPUT_NOT_INITALISED              ,"input not initalised"},
 {0,NULL},
 	};
 

crypto/evp/p_sign.c

@@ -91,7 +91,7 @@ EVP_PKEY *pkey;
 	MS_STATIC EVP_MD_CTX tmp_ctx;
 
 	*siglen=0;
-	memcpy(&tmp_ctx,ctx,sizeof(EVP_MD_CTX));
+	EVP_MD_CTX_copy(&tmp_ctx,ctx);   
 	EVP_DigestFinal(&tmp_ctx,&(m[0]),&m_len);
 	for (i=0; i<4; i++)
 		{

crypto/evp/p_verify.c

@@ -88,7 +88,7 @@ EVP_PKEY *pkey;
 		EVPerr(EVP_F_EVP_VERIFYFINAL,EVP_R_WRONG_PUBLIC_KEY_TYPE);
 		return(-1);
 		}
-	memcpy(&tmp_ctx,ctx,sizeof(EVP_MD_CTX));
+	EVP_MD_CTX_copy(&tmp_ctx,ctx);     
 	EVP_DigestFinal(&tmp_ctx,&(m[0]),&m_len);
         if (ctx->digest->verify == NULL)
                 {