From 4579924b7e55fccc7013e6de196f2e2ab175ce39 Mon Sep 17 00:00:00 2001
From: Richard Levitte <levitte@openssl.org>
Date: Thu, 28 Nov 2002 08:04:36 +0000
Subject: Cleanse memory using the new OPENSSL_cleanse() function. I've covered
 all the memset()s I felt safe modifying, but may have missed some.

---
 apps/apps.c              |  6 +++---
 apps/ca.c                |  2 +-
 apps/dgst.c              |  2 +-
 apps/enc.c               |  4 ++--
 apps/s_client.c          |  6 +++---
 apps/s_server.c          |  2 +-
 apps/s_socket.c          | 16 ++++++++--------
 crypto/asn1/a_sign.c     |  8 ++++----
 crypto/asn1/a_verify.c   |  4 ++--
 crypto/asn1/n_pkey.c     |  6 +++---
 crypto/asn1/p8_pkey.c    |  4 ++--
 crypto/des/des.c         | 32 ++++++++++++++++----------------
 crypto/des/read2pwd.c    |  8 ++++----
 crypto/des/read_pwd.c    |  2 +-
 crypto/des/str2key.c     |  4 ++--
 crypto/ec/ec_key.c       |  2 +-
 crypto/ec/ec_lib.c       |  6 +++---
 crypto/ecdh/ech_lib.c    |  2 +-
 crypto/ecdsa/ecs_lib.c   |  2 +-
 crypto/evp/bio_enc.c     |  2 +-
 crypto/evp/bio_ok.c      |  2 +-
 crypto/evp/digest.c      |  2 +-
 crypto/evp/e_idea.c      |  2 +-
 crypto/evp/evp_key.c     |  4 ++--
 crypto/evp/p5_crpt.c     |  6 +++---
 crypto/evp/p5_crpt2.c    |  2 +-
 crypto/evp/p_open.c      |  2 +-
 crypto/md32_common.h     |  2 +-
 crypto/mem.c             |  2 +-
 crypto/pem/pem_info.c    |  4 ++--
 crypto/pem/pem_lib.c     | 14 +++++++-------
 crypto/pem/pem_pk8.c     |  2 +-
 crypto/pem/pem_seal.c    |  2 +-
 crypto/pkcs12/p12_crpt.c |  4 ++--
 crypto/pkcs12/p12_decr.c |  4 ++--
 crypto/pkcs12/p12_key.c  |  2 +-
 crypto/pkcs7/bio_ber.c   |  2 +-
 crypto/pkcs7/pk7_doit.c  |  4 ++--
 crypto/rand/md_rand.c    |  4 ++--
 crypto/rand/rand_unix.c  |  2 +-
 crypto/rand/randfile.c   |  4 ++--
 crypto/rc4/rc4.c         |  4 ++--
 crypto/ripemd/rmd_one.c  |  2 +-
 crypto/rsa/rsa_eay.c     |  8 ++++----
 crypto/rsa/rsa_saos.c    |  4 ++--
 crypto/rsa/rsa_sign.c    |  4 ++--
 crypto/sha/sha1_one.c    |  2 +-
 crypto/sha/sha_one.c     |  2 +-
 crypto/ui/ui_openssl.c   |  2 +-
 crypto/ui/ui_util.c      |  2 +-
 crypto/x509/x509_vfy.c   |  2 +-
 engines/e_4758_cca.c     |  4 ++--
 engines/e_sureware.c     |  2 +-
 ssl/kssl.c               |  4 ++--
 ssl/s2_lib.c             |  2 +-
 ssl/s3_clnt.c            |  6 +++---
 ssl/s3_enc.c             |  8 ++++----
 ssl/s3_lib.c             |  2 +-
 ssl/s3_srvr.c            |  2 +-
 ssl/ssl_sess.c           |  8 ++++----
 ssl/t1_enc.c             | 12 ++++++------
 61 files changed, 137 insertions(+), 137 deletions(-)

diff --git a/apps/apps.c b/apps/apps.c
index 271dfa1439..4a8c9263a7 100644
--- a/apps/apps.c
+++ b/apps/apps.c
@@ -615,7 +615,7 @@ int password_callback(char *buf, int bufsiz, int verify,
 
 		if (buff)
 			{
-			memset(buff,0,(unsigned int)bufsiz);
+			OPENSSL_cleanse(buff,(unsigned int)bufsiz);
 			OPENSSL_free(buff);
 			}
 
@@ -625,13 +625,13 @@ int password_callback(char *buf, int bufsiz, int verify,
 			{
 			BIO_printf(bio_err, "User interface error\n");
 			ERR_print_errors(bio_err);
-			memset(buf,0,(unsigned int)bufsiz);
+			OPENSSL_cleanse(buf,(unsigned int)bufsiz);
 			res = 0;
 			}
 		if (ok == -2)
 			{
 			BIO_printf(bio_err,"aborted!\n");
-			memset(buf,0,(unsigned int)bufsiz);
+			OPENSSL_cleanse(buf,(unsigned int)bufsiz);
 			res = 0;
 			}
 		UI_free(ui);
diff --git a/apps/ca.c b/apps/ca.c
index 42738deb3a..cac83a114f 100644
--- a/apps/ca.c
+++ b/apps/ca.c
@@ -706,7 +706,7 @@ bad:
 		}
 	pkey = load_key(bio_err, keyfile, keyform, 0, key, e, 
 		"CA private key");
-	if (key) memset(key,0,strlen(key));
+	if (key) OPENSSL_cleanse(key,strlen(key));
 	if (pkey == NULL)
 		{
 		/* load_key() has already printed an appropriate message */
diff --git a/apps/dgst.c b/apps/dgst.c
index dd65a591f5..c4bb7a1061 100644
--- a/apps/dgst.c
+++ b/apps/dgst.c
@@ -356,7 +356,7 @@ int MAIN(int argc, char **argv)
 end:
 	if (buf != NULL)
 		{
-		memset(buf,0,BUFSIZE);
+		OPENSSL_cleanse(buf,BUFSIZE);
 		OPENSSL_free(buf);
 		}
 	if (in != NULL) BIO_free(in);
diff --git a/apps/enc.c b/apps/enc.c
index eff5c5610e..bae7f21d79 100644
--- a/apps/enc.c
+++ b/apps/enc.c
@@ -481,9 +481,9 @@ bad:
 			 * bug picked up by
 			 * Larry J. Hughes Jr. <hughes@indiana.edu> */
 			if (str == strbuf)
-				memset(str,0,SIZE);
+				OPENSSL_cleanse(str,SIZE);
 			else
-				memset(str,0,strlen(str));
+				OPENSSL_cleanse(str,strlen(str));
 			}
 		if ((hiv != NULL) && !set_hex(hiv,iv,sizeof iv))
 			{
diff --git a/apps/s_client.c b/apps/s_client.c
index 3b018ff0e0..7b1fa7b22b 100644
--- a/apps/s_client.c
+++ b/apps/s_client.c
@@ -908,9 +908,9 @@ end:
 	if (con != NULL) SSL_free(con);
 	if (con2 != NULL) SSL_free(con2);
 	if (ctx != NULL) SSL_CTX_free(ctx);
-	if (cbuf != NULL) { memset(cbuf,0,BUFSIZZ); OPENSSL_free(cbuf); }
-	if (sbuf != NULL) { memset(sbuf,0,BUFSIZZ); OPENSSL_free(sbuf); }
-	if (mbuf != NULL) { memset(mbuf,0,BUFSIZZ); OPENSSL_free(mbuf); }
+	if (cbuf != NULL) { OPENSSL_cleanse(cbuf,BUFSIZZ); OPENSSL_free(cbuf); }
+	if (sbuf != NULL) { OPENSSL_cleanse(sbuf,BUFSIZZ); OPENSSL_free(sbuf); }
+	if (mbuf != NULL) { OPENSSL_cleanse(mbuf,BUFSIZZ); OPENSSL_free(mbuf); }
 	if (bio_c_out != NULL)
 		{
 		BIO_free(bio_c_out);
diff --git a/apps/s_server.c b/apps/s_server.c
index 4d87567a62..7380fcc85f 100644
--- a/apps/s_server.c
+++ b/apps/s_server.c
@@ -1262,7 +1262,7 @@ err:
 	BIO_printf(bio_s_out,"CONNECTION CLOSED\n");
 	if (buf != NULL)
 		{
-		memset(buf,0,bufsize);
+		OPENSSL_cleanse(buf,bufsize);
 		OPENSSL_free(buf);
 		}
 	if (ret >= 0)
diff --git a/apps/s_socket.c b/apps/s_socket.c
index 77908b6380..9a696d5f93 100644
--- a/apps/s_socket.c
+++ b/apps/s_socket.c
@@ -62,14 +62,6 @@
 #include <errno.h>
 #include <signal.h>
 
-#ifdef FLAT_INC
-#include "e_os.h"
-#else
-#include "../e_os.h"
-#endif
-
-#ifndef OPENSSL_NO_SOCK
-
 /* With IPv6, it looks like Digital has mixed up the proper order of
    recursive header file inclusion, resulting in the compiler complaining
    that u_int isn't defined, but only if _POSIX_C_SOURCE is defined, which
@@ -87,6 +79,14 @@ typedef unsigned int u_int;
 #include "s_apps.h"
 #include <openssl/ssl.h>
 
+#ifdef FLAT_INC
+#include "e_os.h"
+#else
+#include "../e_os.h"
+#endif
+
+#ifndef OPENSSL_NO_SOCK
+
 static struct hostent *GetHostByName(char *name);
 #ifdef OPENSSL_SYS_WINDOWS
 static void ssl_sock_cleanup(void);
diff --git a/crypto/asn1/a_sign.c b/crypto/asn1/a_sign.c
index de53b44144..52ce7e3974 100644
--- a/crypto/asn1/a_sign.c
+++ b/crypto/asn1/a_sign.c
@@ -204,9 +204,9 @@ int ASN1_sign(int (*i2d)(), X509_ALGOR *algor1, X509_ALGOR *algor2,
 err:
 	EVP_MD_CTX_cleanup(&ctx);
 	if (buf_in != NULL)
-		{ memset((char *)buf_in,0,(unsigned int)inl); OPENSSL_free(buf_in); }
+		{ OPENSSL_cleanse((char *)buf_in,(unsigned int)inl); OPENSSL_free(buf_in); }
 	if (buf_out != NULL)
-		{ memset((char *)buf_out,0,outll); OPENSSL_free(buf_out); }
+		{ OPENSSL_cleanse((char *)buf_out,outll); OPENSSL_free(buf_out); }
 	return(outl);
 	}
 
@@ -287,8 +287,8 @@ int ASN1_item_sign(const ASN1_ITEM *it, X509_ALGOR *algor1, X509_ALGOR *algor2,
 err:
 	EVP_MD_CTX_cleanup(&ctx);
 	if (buf_in != NULL)
-		{ memset((char *)buf_in,0,(unsigned int)inl); OPENSSL_free(buf_in); }
+		{ OPENSSL_cleanse((char *)buf_in,(unsigned int)inl); OPENSSL_free(buf_in); }
 	if (buf_out != NULL)
-		{ memset((char *)buf_out,0,outll); OPENSSL_free(buf_out); }
+		{ OPENSSL_cleanse((char *)buf_out,outll); OPENSSL_free(buf_out); }
 	return(outl);
 	}
diff --git a/crypto/asn1/a_verify.c b/crypto/asn1/a_verify.c
index bf41de5146..da2a0a6d69 100644
--- a/crypto/asn1/a_verify.c
+++ b/crypto/asn1/a_verify.c
@@ -103,7 +103,7 @@ int ASN1_verify(int (*i2d)(), X509_ALGOR *a, ASN1_BIT_STRING *signature,
 	EVP_VerifyInit_ex(&ctx,type, NULL);
 	EVP_VerifyUpdate(&ctx,(unsigned char *)buf_in,inl);
 
-	memset(buf_in,0,(unsigned int)inl);
+	OPENSSL_cleanse(buf_in,(unsigned int)inl);
 	OPENSSL_free(buf_in);
 
 	if (EVP_VerifyFinal(&ctx,(unsigned char *)signature->data,
@@ -153,7 +153,7 @@ int ASN1_item_verify(const ASN1_ITEM *it, X509_ALGOR *a, ASN1_BIT_STRING *signat
 	EVP_VerifyInit_ex(&ctx,type, NULL);
 	EVP_VerifyUpdate(&ctx,(unsigned char *)buf_in,inl);
 
-	memset(buf_in,0,(unsigned int)inl);
+	OPENSSL_cleanse(buf_in,(unsigned int)inl);
 	OPENSSL_free(buf_in);
 
 	if (EVP_VerifyFinal(&ctx,(unsigned char *)signature->data,
diff --git a/crypto/asn1/n_pkey.c b/crypto/asn1/n_pkey.c
index 9146ee02c9..766b51c538 100644
--- a/crypto/asn1/n_pkey.c
+++ b/crypto/asn1/n_pkey.c
@@ -187,7 +187,7 @@ int i2d_RSA_NET(const RSA *a, unsigned char **pp, int (*cb)(), int sgckey)
 	i2d_NETSCAPE_PKEY(pkey,&zz);
 
 	/* Wipe the private key encoding */
-	memset(pkey->private_key->data, 0, rsalen);
+	OPENSSL_cleanse(pkey->private_key->data, rsalen);
 		
 	if (cb == NULL)
 		cb=EVP_read_pw_string;
@@ -206,7 +206,7 @@ int i2d_RSA_NET(const RSA *a, unsigned char **pp, int (*cb)(), int sgckey)
 	}
 
 	EVP_BytesToKey(EVP_rc4(),EVP_md5(),NULL,buf,i,1,key,NULL);
-	memset(buf,0,256);
+	OPENSSL_cleanse(buf,256);
 
 	/* Encrypt private key in place */
 	zz = enckey->enckey->digest->data;
@@ -294,7 +294,7 @@ static RSA *d2i_RSA_NET_2(RSA **a, ASN1_OCTET_STRING *os,
 	}
 		
 	EVP_BytesToKey(EVP_rc4(),EVP_md5(),NULL,buf,i,1,key,NULL);
-	memset(buf,0,256);
+	OPENSSL_cleanse(buf,256);
 
 	EVP_CIPHER_CTX_init(&ctx);
 	EVP_DecryptInit_ex(&ctx,EVP_rc4(),NULL, key,NULL);
diff --git a/crypto/asn1/p8_pkey.c b/crypto/asn1/p8_pkey.c
index b634d5bc85..24b409132f 100644
--- a/crypto/asn1/p8_pkey.c
+++ b/crypto/asn1/p8_pkey.c
@@ -68,8 +68,8 @@ static int pkey_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it)
 	if(operation == ASN1_OP_FREE_PRE) {
 		PKCS8_PRIV_KEY_INFO *key = (PKCS8_PRIV_KEY_INFO *)*pval;
 		if (key->pkey->value.octet_string)
-		memset(key->pkey->value.octet_string->data,
-				 0, key->pkey->value.octet_string->length);
+		OPENSSL_cleanse(key->pkey->value.octet_string->data,
+			key->pkey->value.octet_string->length);
 	}
 	return 1;
 }
diff --git a/crypto/des/des.c b/crypto/des/des.c
index d8c846b23d..343135ff9e 100644
--- a/crypto/des/des.c
+++ b/crypto/des/des.c
@@ -427,7 +427,7 @@ void doencryption(void)
 				k2[i-8]=k;
 			}
 		DES_set_key_unchecked(&k2,&ks2);
-		memset(k2,0,sizeof(k2));
+		OPENSSL_cleanse(k2,sizeof(k2));
 		}
 	else if (longk || flag3)
 		{
@@ -435,7 +435,7 @@ void doencryption(void)
 			{
 			DES_string_to_2keys(key,&kk,&k2);
 			DES_set_key_unchecked(&k2,&ks2);
-			memset(k2,0,sizeof(k2));
+			OPENSSL_cleanse(k2,sizeof(k2));
 			}
 		else
 			DES_string_to_key(key,&kk);
@@ -457,8 +457,8 @@ void doencryption(void)
 			}
 
 	DES_set_key_unchecked(&kk,&ks);
-	memset(key,0,sizeof(key));
-	memset(kk,0,sizeof(kk));
+	OPENSSL_cleanse(key,sizeof(key));
+	OPENSSL_cleanse(kk,sizeof(kk));
 	/* woops - A bug that does not showup under unix :-( */
 	memset(iv,0,sizeof(iv));
 	memset(iv2,0,sizeof(iv2));
@@ -666,18 +666,18 @@ void doencryption(void)
 		if (l) fclose(CKSUM_OUT);
 		}
 problems:
-	memset(buf,0,sizeof(buf));
-	memset(obuf,0,sizeof(obuf));
-	memset(&ks,0,sizeof(ks));
-	memset(&ks2,0,sizeof(ks2));
-	memset(iv,0,sizeof(iv));
-	memset(iv2,0,sizeof(iv2));
-	memset(kk,0,sizeof(kk));
-	memset(k2,0,sizeof(k2));
-	memset(uubuf,0,sizeof(uubuf));
-	memset(b,0,sizeof(b));
-	memset(bb,0,sizeof(bb));
-	memset(cksum,0,sizeof(cksum));
+	OPENSSL_cleanse(buf,sizeof(buf));
+	OPENSSL_cleanse(obuf,sizeof(obuf));
+	OPENSSL_cleanse(&ks,sizeof(ks));
+	OPENSSL_cleanse(&ks2,sizeof(ks2));
+	OPENSSL_cleanse(iv,sizeof(iv));
+	OPENSSL_cleanse(iv2,sizeof(iv2));
+	OPENSSL_cleanse(kk,sizeof(kk));
+	OPENSSL_cleanse(k2,sizeof(k2));
+	OPENSSL_cleanse(uubuf,sizeof(uubuf));
+	OPENSSL_cleanse(b,sizeof(b));
+	OPENSSL_cleanse(bb,sizeof(bb));
+	OPENSSL_cleanse(cksum,sizeof(cksum));
 	if (Exit) EXIT(Exit);
 	}
 
diff --git a/crypto/des/read2pwd.c b/crypto/des/read2pwd.c
index 241adfa342..430da4e994 100644
--- a/crypto/des/read2pwd.c
+++ b/crypto/des/read2pwd.c
@@ -123,8 +123,8 @@ int DES_read_password(DES_cblock *key, const char *prompt, int verify)
 
 	if ((ok=UI_UTIL_read_pw(buf,buff,BUFSIZ,prompt,verify)) == 0)
 		DES_string_to_key(buf,key);
-	memset(buf,0,BUFSIZ);
-	memset(buff,0,BUFSIZ);
+	OPENSSL_cleanse(buf,BUFSIZ);
+	OPENSSL_cleanse(buff,BUFSIZ);
 	return(ok);
 	}
 
@@ -136,7 +136,7 @@ int DES_read_2passwords(DES_cblock *key1, DES_cblock *key2, const char *prompt,
 
 	if ((ok=UI_UTIL_read_pw(buf,buff,BUFSIZ,prompt,verify)) == 0)
 		DES_string_to_2keys(buf,key1,key2);
-	memset(buf,0,BUFSIZ);
-	memset(buff,0,BUFSIZ);
+	OPENSSL_cleanse(buf,BUFSIZ);
+	OPENSSL_cleanse(buff,BUFSIZ);
 	return(ok);
 	}
diff --git a/crypto/des/read_pwd.c b/crypto/des/read_pwd.c
index c79c9a0e2a..ce5fa00a37 100644
--- a/crypto/des/read_pwd.c
+++ b/crypto/des/read_pwd.c
@@ -220,7 +220,7 @@ int des_read_pw_string(char *buf, int length, const char *prompt,
 	int ret;
 
 	ret=des_read_pw(buf,buff,(length>BUFSIZ)?BUFSIZ:length,prompt,verify);
-	memset(buff,0,BUFSIZ);
+	OPENSSL_cleanse(buff,BUFSIZ);
 	return(ret);
 	}
 
diff --git a/crypto/des/str2key.c b/crypto/des/str2key.c
index 36c3f81d99..0373db469c 100644
--- a/crypto/des/str2key.c
+++ b/crypto/des/str2key.c
@@ -94,7 +94,7 @@ void DES_string_to_key(const char *str, DES_cblock *key)
 	DES_set_key_unchecked(key,&ks);
 #endif
 	DES_cbc_cksum((const unsigned char*)str,key,length,&ks,key);
-	memset(&ks,0,sizeof(ks));
+	OPENSSL_cleanse(&ks,sizeof(ks));
 	DES_set_odd_parity(key);
 	}
 
@@ -167,7 +167,7 @@ void DES_string_to_2keys(const char *str, DES_cblock *key1, DES_cblock *key2)
 	DES_set_key_unchecked(key2,&ks);
 #endif
 	DES_cbc_cksum((const unsigned char*)str,key2,length,&ks,key2);
-	memset(&ks,0,sizeof(ks));
+	OPENSSL_cleanse(&ks,sizeof(ks));
 	DES_set_odd_parity(key1);
 	DES_set_odd_parity(key2);
 	}
diff --git a/crypto/ec/ec_key.c b/crypto/ec/ec_key.c
index d537fe7de6..d7758c91d3 100644
--- a/crypto/ec/ec_key.c
+++ b/crypto/ec/ec_key.c
@@ -118,7 +118,7 @@ void EC_KEY_free(EC_KEY *r)
 	if (r->meth_data && r->meth_data->finish)
 		r->meth_data->finish(r);
 
-	memset((void *)r, 0x0, sizeof(EC_KEY));
+	OPENSSL_cleanse((void *)r, sizeof(EC_KEY));
 
 	OPENSSL_free(r);
 	}
diff --git a/crypto/ec/ec_lib.c b/crypto/ec/ec_lib.c
index 9669f42aab..2cc0dc0ec1 100644
--- a/crypto/ec/ec_lib.c
+++ b/crypto/ec/ec_lib.c
@@ -162,11 +162,11 @@ void EC_GROUP_clear_free(EC_GROUP *group)
 
 	if (group->seed)
 		{
-		memset(group->seed, 0, group->seed_len);
+		OPENSSL_cleanse(group->seed, group->seed_len);
 		OPENSSL_free(group->seed);
 		}
 
-	memset(group, 0, sizeof *group);
+	OPENSSL_cleanse(group, sizeof *group);
 	OPENSSL_free(group);
 	}
 
@@ -591,7 +591,7 @@ void EC_POINT_clear_free(EC_POINT *point)
 		point->meth->point_clear_finish(point);
 	else if (point->meth != NULL && point->meth->point_finish != 0)
 		point->meth->point_finish(point);
-	memset(point, 0, sizeof *point);
+	OPENSSL_cleanse(point, sizeof *point);
 	OPENSSL_free(point);
 	}
 
diff --git a/crypto/ecdh/ech_lib.c b/crypto/ecdh/ech_lib.c
index fd8cb19fdd..59526f33bd 100644
--- a/crypto/ecdh/ech_lib.c
+++ b/crypto/ecdh/ech_lib.c
@@ -176,7 +176,7 @@ void ECDH_DATA_free(ECDH_DATA *r)
 
 	CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDH, r, &r->ex_data);
 
-	memset((void *)r, 0x0, sizeof(ECDH_DATA));
+	OPENSSL_cleanse((void *)r, sizeof(ECDH_DATA));
 
 	OPENSSL_free(r);
 	}
diff --git a/crypto/ecdsa/ecs_lib.c b/crypto/ecdsa/ecs_lib.c
index 8eb1c30865..9465dee625 100644
--- a/crypto/ecdsa/ecs_lib.c
+++ b/crypto/ecdsa/ecs_lib.c
@@ -170,7 +170,7 @@ void ECDSA_DATA_free(ECDSA_DATA *r)
 
 	CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDSA, r, &r->ex_data);
 
-	memset((void *)r, 0x0, sizeof(ECDSA_DATA));
+	OPENSSL_cleanse((void *)r, sizeof(ECDSA_DATA));
 
 	OPENSSL_free(r);
 }
diff --git a/crypto/evp/bio_enc.c b/crypto/evp/bio_enc.c
index 64fb2353af..510e1bc8a4 100644
--- a/crypto/evp/bio_enc.c
+++ b/crypto/evp/bio_enc.c
@@ -132,7 +132,7 @@ static int enc_free(BIO *a)
 	if (a == NULL) return(0);
 	b=(BIO_ENC_CTX *)a->ptr;
 	EVP_CIPHER_CTX_cleanup(&(b->cipher));
-	memset(a->ptr,0,sizeof(BIO_ENC_CTX));
+	OPENSSL_cleanse(a->ptr,sizeof(BIO_ENC_CTX));
 	OPENSSL_free(a->ptr);
 	a->ptr=NULL;
 	a->init=0;
diff --git a/crypto/evp/bio_ok.c b/crypto/evp/bio_ok.c
index 3cbc6e7848..530ab937ce 100644
--- a/crypto/evp/bio_ok.c
+++ b/crypto/evp/bio_ok.c
@@ -211,7 +211,7 @@ static int ok_free(BIO *a)
 	{
 	if (a == NULL) return(0);
 	EVP_MD_CTX_cleanup(&((BIO_OK_CTX *)a->ptr)->md);
-	memset(a->ptr,0,sizeof(BIO_OK_CTX));
+	OPENSSL_cleanse(a->ptr,sizeof(BIO_OK_CTX));
 	OPENSSL_free(a->ptr);
 	a->ptr=NULL;
 	a->init=0;
diff --git a/crypto/evp/digest.c b/crypto/evp/digest.c
index 9d18728d30..33013c41a6 100644
--- a/crypto/evp/digest.c
+++ b/crypto/evp/digest.c
@@ -301,7 +301,7 @@ int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx)
 		ctx->digest->cleanup(ctx);
 	if (ctx->digest && ctx->digest->ctx_size && ctx->md_data)
 		{
-		memset(ctx->md_data,0,ctx->digest->ctx_size);
+		OPENSSL_cleanse(ctx->md_data,ctx->digest->ctx_size);
 		OPENSSL_free(ctx->md_data);
 		}
 	if(ctx->engine)
diff --git a/crypto/evp/e_idea.c b/crypto/evp/e_idea.c
index ed838d3e62..b9efa75ae7 100644
--- a/crypto/evp/e_idea.c
+++ b/crypto/evp/e_idea.c
@@ -109,7 +109,7 @@ static int idea_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 
 		idea_set_encrypt_key(key,&tmp);
 		idea_set_decrypt_key(&tmp,ctx->cipher_data);
-		memset((unsigned char *)&tmp,0,
+		OPENSSL_cleanse((unsigned char *)&tmp,
 				sizeof(IDEA_KEY_SCHEDULE));
 		}
 	return 1;
diff --git a/crypto/evp/evp_key.c b/crypto/evp/evp_key.c
index dc103bd1d7..5f387a94d3 100644
--- a/crypto/evp/evp_key.c
+++ b/crypto/evp/evp_key.c
@@ -103,7 +103,7 @@ int EVP_read_pw_string(char *buf, int len, const char *prompt, int verify)
 			buff,0,(len>=BUFSIZ)?BUFSIZ-1:len,buf);
 	ret = UI_process(ui);
 	UI_free(ui);
-	memset(buff,0,BUFSIZ);
+	OPENSSL_cleanse(buff,BUFSIZ);
 	return ret;
 	}
 
@@ -168,7 +168,7 @@ int EVP_BytesToKey(const EVP_CIPHER *type, const EVP_MD *md,
 		if ((nkey == 0) && (niv == 0)) break;
 		}
 	EVP_MD_CTX_cleanup(&c);
-	memset(&(md_buf[0]),0,EVP_MAX_MD_SIZE);
+	OPENSSL_cleanse(&(md_buf[0]),EVP_MAX_MD_SIZE);
 	return(type->key_len);
 	}
 
diff --git a/crypto/evp/p5_crpt.c b/crypto/evp/p5_crpt.c
index d15b799281..a1874e83b2 100644
--- a/crypto/evp/p5_crpt.c
+++ b/crypto/evp/p5_crpt.c
@@ -146,8 +146,8 @@ int PKCS5_PBE_keyivgen(EVP_CIPHER_CTX *cctx, const char *pass, int passlen,
 	memcpy(iv, md_tmp + (16 - EVP_CIPHER_iv_length(cipher)),
 						 EVP_CIPHER_iv_length(cipher));
 	EVP_CipherInit_ex(cctx, cipher, NULL, key, iv, en_de);
-	memset(md_tmp, 0, EVP_MAX_MD_SIZE);
-	memset(key, 0, EVP_MAX_KEY_LENGTH);
-	memset(iv, 0, EVP_MAX_IV_LENGTH);
+	OPENSSL_cleanse(md_tmp, EVP_MAX_MD_SIZE);
+	OPENSSL_cleanse(key, EVP_MAX_KEY_LENGTH);
+	OPENSSL_cleanse(iv, EVP_MAX_IV_LENGTH);
 	return 1;
 }
diff --git a/crypto/evp/p5_crpt2.c b/crypto/evp/p5_crpt2.c
index 098ce8afa0..1f94e1ef88 100644
--- a/crypto/evp/p5_crpt2.c
+++ b/crypto/evp/p5_crpt2.c
@@ -231,7 +231,7 @@ int PKCS5_v2_PBE_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
 	iter = ASN1_INTEGER_get(kdf->iter);
 	PKCS5_PBKDF2_HMAC_SHA1(pass, passlen, salt, saltlen, iter, keylen, key);
 	EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, en_de);
-	memset(key, 0, keylen);
+	OPENSSL_cleanse(key, keylen);
 	PBKDF2PARAM_free(kdf);
 	return 1;
 
diff --git a/crypto/evp/p_open.c b/crypto/evp/p_open.c
index 6976f2a867..5a933d1cda 100644
--- a/crypto/evp/p_open.c
+++ b/crypto/evp/p_open.c
@@ -101,7 +101,7 @@ int EVP_OpenInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *type, unsigned char *ek,
 
 	ret=1;
 err:
-	if (key != NULL) memset(key,0,size);
+	if (key != NULL) OPENSSL_cleanse(key,size);
 	OPENSSL_free(key);
 	return(ret);
 	}
diff --git a/crypto/md32_common.h b/crypto/md32_common.h
index 86e41bf6df..275b93618b 100644
--- a/crypto/md32_common.h
+++ b/crypto/md32_common.h
@@ -606,7 +606,7 @@ int HASH_FINAL (unsigned char *md, HASH_CTX *c)
 	c->num=0;
 	/* clear stuff, HASH_BLOCK may be leaving some stuff on the stack
 	 * but I'm not worried :-)
-	memset((void *)c,0,sizeof(HASH_CTX));
+	OPENSSL_cleanse((void *)c,sizeof(HASH_CTX));
 	 */
 	return 1;
 	}
diff --git a/crypto/mem.c b/crypto/mem.c
index 46a00697ce..d7d3cda5dc 100644
--- a/crypto/mem.c
+++ b/crypto/mem.c
@@ -343,7 +343,7 @@ void *CRYPTO_realloc_clean(void *str, int old_len, int num, const char *file,
 	ret=malloc_ex_func(num,file,line);
 	if(ret)
 		memcpy(ret,str,old_len);
-	memset(str,'\0',old_len);
+	OPENSSL_cleanse(str,old_len);
 	free_func(str);
 #ifdef LEVITTE_DEBUG_MEM
 	fprintf(stderr, "LEVITTE_DEBUG_MEM:         | 0x%p -> 0x%p (%d)\n", str, ret, num);
diff --git a/crypto/pem/pem_info.c b/crypto/pem/pem_info.c
index 5412408584..17ea85e4d7 100644
--- a/crypto/pem/pem_info.c
+++ b/crypto/pem/pem_info.c
@@ -383,7 +383,7 @@ int PEM_X509_INFO_write_bio(BIO *bp, X509_INFO *xi, EVP_CIPHER *enc,
 	ret=1;
 
 err:
-	memset((char *)&ctx,0,sizeof(ctx));
-	memset(buf,0,PEM_BUFSIZE);
+	OPENSSL_cleanse((char *)&ctx,sizeof(ctx));
+	OPENSSL_cleanse(buf,PEM_BUFSIZE);
 	return(ret);
 	}
diff --git a/crypto/pem/pem_lib.c b/crypto/pem/pem_lib.c
index 8e213c11c4..d3e9ce8577 100644
--- a/crypto/pem/pem_lib.c
+++ b/crypto/pem/pem_lib.c
@@ -368,13 +368,13 @@ int PEM_ASN1_write_bio(int (*i2d)(), const char *name, BIO *bp, char *x,
 	i=PEM_write_bio(bp,name,buf,data,i);
 	if (i <= 0) ret=0;
 err:
-	memset(key,0,sizeof(key));
-	memset(iv,0,sizeof(iv));
-	memset((char *)&ctx,0,sizeof(ctx));
-	memset(buf,0,PEM_BUFSIZE);
+	OPENSSL_cleanse(key,sizeof(key));
+	OPENSSL_cleanse(iv,sizeof(iv));
+	OPENSSL_cleanse((char *)&ctx,sizeof(ctx));
+	OPENSSL_cleanse(buf,PEM_BUFSIZE);
 	if (data != NULL)
 		{
-		memset(data,0,(unsigned int)dsize);
+		OPENSSL_cleanse(data,(unsigned int)dsize);
 		OPENSSL_free(data);
 		}
 	return(ret);
@@ -415,8 +415,8 @@ int PEM_do_header(EVP_CIPHER_INFO *cipher, unsigned char *data, long *plen,
 	EVP_DecryptUpdate(&ctx,data,&i,data,j);
 	o=EVP_DecryptFinal_ex(&ctx,&(data[i]),&j);
 	EVP_CIPHER_CTX_cleanup(&ctx);
-	memset((char *)buf,0,sizeof(buf));
-	memset((char *)key,0,sizeof(key));
+	OPENSSL_cleanse((char *)buf,sizeof(buf));
+	OPENSSL_cleanse((char *)key,sizeof(key));
 	j+=i;
 	if (!o)
 		{
diff --git a/crypto/pem/pem_pk8.c b/crypto/pem/pem_pk8.c
index f44182ffb5..db38a2a79d 100644
--- a/crypto/pem/pem_pk8.c
+++ b/crypto/pem/pem_pk8.c
@@ -136,7 +136,7 @@ static int do_pk8pkey(BIO *bp, EVP_PKEY *x, int isder, int nid, const EVP_CIPHER
 			kstr = buf;
 		}
 		p8 = PKCS8_encrypt(nid, enc, kstr, klen, NULL, 0, 0, p8inf);
-		if(kstr == buf) memset(buf, 0, klen);
+		if(kstr == buf) OPENSSL_cleanse(buf, klen);
 		PKCS8_PRIV_KEY_INFO_free(p8inf);
 		if(isder) ret = i2d_PKCS8_bio(bp, p8);
 		else ret = PEM_write_bio_PKCS8(bp, p8);
diff --git a/crypto/pem/pem_seal.c b/crypto/pem/pem_seal.c
index ae463a301d..56e08abd70 100644
--- a/crypto/pem/pem_seal.c
+++ b/crypto/pem/pem_seal.c
@@ -112,7 +112,7 @@ int PEM_SealInit(PEM_ENCODE_SEAL_CTX *ctx, EVP_CIPHER *type, EVP_MD *md_type,
 	ret=npubk;
 err:
 	if (s != NULL) OPENSSL_free(s);
-	memset(key,0,EVP_MAX_KEY_LENGTH);
+	OPENSSL_cleanse(key,EVP_MAX_KEY_LENGTH);
 	return(ret);
 	}
 
diff --git a/crypto/pkcs12/p12_crpt.c b/crypto/pkcs12/p12_crpt.c
index 97be6a5fb5..5e8958612b 100644
--- a/crypto/pkcs12/p12_crpt.c
+++ b/crypto/pkcs12/p12_crpt.c
@@ -118,7 +118,7 @@ int PKCS12_PBE_keyivgen (EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
 	}
 	PBEPARAM_free(pbe);
 	EVP_CipherInit_ex(ctx, cipher, NULL, key, iv, en_de);
-	memset(key, 0, EVP_MAX_KEY_LENGTH);
-	memset(iv, 0, EVP_MAX_IV_LENGTH);
+	OPENSSL_cleanse(key, EVP_MAX_KEY_LENGTH);
+	OPENSSL_cleanse(iv, EVP_MAX_IV_LENGTH);
 	return 1;
 }
diff --git a/crypto/pkcs12/p12_decr.c b/crypto/pkcs12/p12_decr.c
index 394af368f4..b5684a83ba 100644
--- a/crypto/pkcs12/p12_decr.c
+++ b/crypto/pkcs12/p12_decr.c
@@ -136,7 +136,7 @@ void * PKCS12_item_decrypt_d2i(X509_ALGOR *algor, const ASN1_ITEM *it,
 	}
 #endif
 	ret = ASN1_item_d2i(NULL, &p, outlen, it);
-	if (zbuf) memset(out, 0, outlen);
+	if (zbuf) OPENSSL_cleanse(out, outlen);
 	if(!ret) PKCS12err(PKCS12_F_PKCS12_DECRYPT_D2I,PKCS12_R_DECODE_ERROR);
 	OPENSSL_free(out);
 	return ret;
@@ -168,7 +168,7 @@ ASN1_OCTET_STRING *PKCS12_item_i2d_encrypt(X509_ALGOR *algor, const ASN1_ITEM *i
 		OPENSSL_free(in);
 		return NULL;
 	}
-	if (zbuf) memset(in, 0, inlen);
+	if (zbuf) OPENSSL_cleanse(in, inlen);
 	OPENSSL_free(in);
 	return oct;
 }
diff --git a/crypto/pkcs12/p12_key.c b/crypto/pkcs12/p12_key.c
index 0d39ebde8c..9196a34b4a 100644
--- a/crypto/pkcs12/p12_key.c
+++ b/crypto/pkcs12/p12_key.c
@@ -91,7 +91,7 @@ int PKCS12_key_gen_asc(const char *pass, int passlen, unsigned char *salt,
 	ret = PKCS12_key_gen_uni(unipass, uniplen, salt, saltlen,
 						 id, iter, n, out, md_type);
 	if(unipass) {
-		memset(unipass, 0, uniplen);	/* Clear password from memory */
+		OPENSSL_cleanse(unipass, uniplen);	/* Clear password from memory */
 		OPENSSL_free(unipass);
 	}
 	return ret;
diff --git a/crypto/pkcs7/bio_ber.c b/crypto/pkcs7/bio_ber.c
index 42331f7ab0..895a91177b 100644
--- a/crypto/pkcs7/bio_ber.c
+++ b/crypto/pkcs7/bio_ber.c
@@ -145,7 +145,7 @@ static int ber_free(BIO *a)
 
 	if (a == NULL) return(0);
 	b=(BIO_BER_CTX *)a->ptr;
-	memset(a->ptr,0,sizeof(BIO_BER_CTX));
+	OPENSSL_cleanse(a->ptr,sizeof(BIO_BER_CTX));
 	OPENSSL_free(a->ptr);
 	a->ptr=NULL;
 	a->init=0;
diff --git a/crypto/pkcs7/pk7_doit.c b/crypto/pkcs7/pk7_doit.c
index d1ab612eaa..123671b43e 100644
--- a/crypto/pkcs7/pk7_doit.c
+++ b/crypto/pkcs7/pk7_doit.c
@@ -241,7 +241,7 @@ BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
 			M_ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj);
 			}
 		OPENSSL_free(tmp);
-		memset(key, 0, keylen);
+		OPENSSL_cleanse(key, keylen);
 
 		if (out == NULL)
 			out=btmp;
@@ -448,7 +448,7 @@ BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
 		} 
 		EVP_CipherInit_ex(evp_ctx,NULL,NULL,tmp,NULL,0);
 
-		memset(tmp,0,jj);
+		OPENSSL_cleanse(tmp,jj);
 
 		if (out == NULL)
 			out=etmp;
diff --git a/crypto/rand/md_rand.c b/crypto/rand/md_rand.c
index a00ed70718..eeffc0df4c 100644
--- a/crypto/rand/md_rand.c
+++ b/crypto/rand/md_rand.c
@@ -177,10 +177,10 @@ RAND_METHOD *RAND_SSLeay(void)
 
 static void ssleay_rand_cleanup(void)
 	{
-	memset(state,0,sizeof(state));
+	OPENSSL_cleanse(state,sizeof(state));
 	state_num=0;
 	state_index=0;
-	memset(md,0,MD_DIGEST_LENGTH);
+	OPENSSL_cleanse(md,MD_DIGEST_LENGTH);
 	md_count[0]=0;
 	md_count[1]=0;
 	entropy=0;
diff --git a/crypto/rand/rand_unix.c b/crypto/rand/rand_unix.c
index 4175576fcc..a776e52243 100644
--- a/crypto/rand/rand_unix.c
+++ b/crypto/rand/rand_unix.c
@@ -215,7 +215,7 @@ int RAND_poll(void)
 	if (n > 0)
 		{
 		RAND_add(tmpbuf,sizeof tmpbuf,n);
-		memset(tmpbuf,0,n);
+		OPENSSL_cleanse(tmpbuf,n);
 		}
 #endif
 
diff --git a/crypto/rand/randfile.c b/crypto/rand/randfile.c
index 7c2673a61f..41574768ab 100644
--- a/crypto/rand/randfile.c
+++ b/crypto/rand/randfile.c
@@ -124,7 +124,7 @@ int RAND_load_file(const char *file, long bytes)
 			}
 		}
 	fclose(in);
-	memset(buf,0,BUFSIZE);
+	OPENSSL_cleanse(buf,BUFSIZE);
 err:
 	return(ret);
 	}
@@ -189,7 +189,7 @@ int RAND_write_file(const char *file)
 #endif /* OPENSSL_SYS_VMS */
 
 	fclose(out);
-	memset(buf,0,BUFSIZE);
+	OPENSSL_cleanse(buf,BUFSIZE);
 err:
 	return (rand_err ? -1 : ret);
 	}
diff --git a/crypto/rc4/rc4.c b/crypto/rc4/rc4.c
index c2165b0b75..b39c070292 100644
--- a/crypto/rc4/rc4.c
+++ b/crypto/rc4/rc4.c
@@ -155,7 +155,7 @@ bad:
 		i=EVP_read_pw_string(buf,BUFSIZ,"Enter RC4 password:",0);
 		if (i != 0)
 			{
-			memset(buf,0,BUFSIZ);
+			OPENSSL_cleanse(buf,BUFSIZ);
 			fprintf(stderr,"bad password read\n");
 			exit(1);
 			}
@@ -163,7 +163,7 @@ bad:
 		}
 
 	EVP_Digest((unsigned char *)keystr,(unsigned long)strlen(keystr),md,NULL,EVP_md5());
-	memset(keystr,0,strlen(keystr));
+	OPENSSL_cleanse(keystr,strlen(keystr));
 	RC4_set_key(&key,MD5_DIGEST_LENGTH,md);
 	
 	for(;;)
diff --git a/crypto/ripemd/rmd_one.c b/crypto/ripemd/rmd_one.c
index efdf2dd6ef..a783282282 100644
--- a/crypto/ripemd/rmd_one.c
+++ b/crypto/ripemd/rmd_one.c
@@ -70,7 +70,7 @@ unsigned char *RIPEMD160(const unsigned char *d, unsigned long n,
 	RIPEMD160_Init(&c);
 	RIPEMD160_Update(&c,d,n);
 	RIPEMD160_Final(md,&c);
-	memset(&c,0,sizeof(c)); /* security consideration */
+	OPENSSL_cleanse(&c,sizeof(c)); /* security consideration */
 	return(md);
 	}
 
diff --git a/crypto/rsa/rsa_eay.c b/crypto/rsa/rsa_eay.c
index 963c34a948..c4e6d1e22a 100644
--- a/crypto/rsa/rsa_eay.c
+++ b/crypto/rsa/rsa_eay.c
@@ -187,7 +187,7 @@ err:
 	BN_clear_free(&ret);
 	if (buf != NULL) 
 		{
-		memset(buf,0,num);
+		OPENSSL_cleanse(buf,num);
 		OPENSSL_free(buf);
 		}
 	return(r);
@@ -271,7 +271,7 @@ err:
 	BN_clear_free(&f);
 	if (buf != NULL)
 		{
-		memset(buf,0,num);
+		OPENSSL_cleanse(buf,num);
 		OPENSSL_free(buf);
 		}
 	return(r);
@@ -370,7 +370,7 @@ err:
 	BN_clear_free(&ret);
 	if (buf != NULL)
 		{
-		memset(buf,0,num);
+		OPENSSL_cleanse(buf,num);
 		OPENSSL_free(buf);
 		}
 	return(r);
@@ -467,7 +467,7 @@ err:
 	BN_clear_free(&ret);
 	if (buf != NULL)
 		{
-		memset(buf,0,num);
+		OPENSSL_cleanse(buf,num);
 		OPENSSL_free(buf);
 		}
 	return(r);
diff --git a/crypto/rsa/rsa_saos.c b/crypto/rsa/rsa_saos.c
index 423cb50652..f462716a57 100644
--- a/crypto/rsa/rsa_saos.c
+++ b/crypto/rsa/rsa_saos.c
@@ -96,7 +96,7 @@ int RSA_sign_ASN1_OCTET_STRING(int type,
 	else
 		*siglen=i;
 
-	memset(s,0,(unsigned int)j+1);
+	OPENSSL_cleanse(s,(unsigned int)j+1);
 	OPENSSL_free(s);
 	return(ret);
 	}
@@ -139,7 +139,7 @@ int RSA_verify_ASN1_OCTET_STRING(int dtype,
 		ret=1;
 err:
 	if (sig != NULL) M_ASN1_OCTET_STRING_free(sig);
-	memset(s,0,(unsigned int)siglen);
+	OPENSSL_cleanse(s,(unsigned int)siglen);
 	OPENSSL_free(s);
 	return(ret);
 	}
diff --git a/crypto/rsa/rsa_sign.c b/crypto/rsa/rsa_sign.c
index c53ca73914..4ac2de3407 100644
--- a/crypto/rsa/rsa_sign.c
+++ b/crypto/rsa/rsa_sign.c
@@ -136,7 +136,7 @@ int RSA_sign(int type, const unsigned char *m, unsigned int m_len,
 		*siglen=i;
 
 	if(type != NID_md5_sha1) {
-		memset(tmps,0,(unsigned int)j+1);
+		OPENSSL_cleanse(tmps,(unsigned int)j+1);
 		OPENSSL_free(tmps);
 	}
 	return(ret);
@@ -221,7 +221,7 @@ int RSA_verify(int dtype, const unsigned char *m, unsigned int m_len,
 	}
 err:
 	if (sig != NULL) X509_SIG_free(sig);
-	memset(s,0,(unsigned int)siglen);
+	OPENSSL_cleanse(s,(unsigned int)siglen);
 	OPENSSL_free(s);
 	return(ret);
 	}
diff --git a/crypto/sha/sha1_one.c b/crypto/sha/sha1_one.c
index e6a24888ed..ad235d6cdc 100644
--- a/crypto/sha/sha1_one.c
+++ b/crypto/sha/sha1_one.c
@@ -70,7 +70,7 @@ unsigned char *SHA1(const unsigned char *d, unsigned long n, unsigned char *md)
 	SHA1_Init(&c);
 	SHA1_Update(&c,d,n);
 	SHA1_Final(md,&c);
-	memset(&c,0,sizeof(c));
+	OPENSSL_cleanse(&c,sizeof(c));
 	return(md);
 	}
 #endif
diff --git a/crypto/sha/sha_one.c b/crypto/sha/sha_one.c
index 5426faae4a..66b083144a 100644
--- a/crypto/sha/sha_one.c
+++ b/crypto/sha/sha_one.c
@@ -70,7 +70,7 @@ unsigned char *SHA(const unsigned char *d, unsigned long n, unsigned char *md)
 	SHA_Init(&c);
 	SHA_Update(&c,d,n);
 	SHA_Final(md,&c);
-	memset(&c,0,sizeof(c));
+	OPENSSL_cleanse(&c,sizeof(c));
 	return(md);
 	}
 #endif
diff --git a/crypto/ui/ui_openssl.c b/crypto/ui/ui_openssl.c
index 6d5f9cd8b1..e1a872ef7c 100644
--- a/crypto/ui/ui_openssl.c
+++ b/crypto/ui/ui_openssl.c
@@ -449,7 +449,7 @@ error:
 	ok=1;
 #endif
 
-	memset(result,0,BUFSIZ);
+	OPENSSL_cleanse(result,BUFSIZ);
 	return ok;
 	}
 
diff --git a/crypto/ui/ui_util.c b/crypto/ui/ui_util.c
index 8876128e56..fc8b691a87 100644
--- a/crypto/ui/ui_util.c
+++ b/crypto/ui/ui_util.c
@@ -65,7 +65,7 @@ int UI_UTIL_read_pw_string(char *buf,int length,const char *prompt,int verify)
 	int ret;
 
 	ret=UI_UTIL_read_pw(buf,buff,(length>BUFSIZ)?BUFSIZ:length,prompt,verify);
-	memset(buff,0,BUFSIZ);
+	OPENSSL_cleanse(buff,BUFSIZ);
 	return(ret);
 	}
 
diff --git a/crypto/x509/x509_vfy.c b/crypto/x509/x509_vfy.c
index 552d1e7251..568c629367 100644
--- a/crypto/x509/x509_vfy.c
+++ b/crypto/x509/x509_vfy.c
@@ -1158,7 +1158,7 @@ void X509_STORE_CTX_cleanup(X509_STORE_CTX *ctx)
 		ctx->chain=NULL;
 		}
 	CRYPTO_free_ex_data(CRYPTO_EX_INDEX_X509_STORE_CTX, ctx, &(ctx->ex_data));
-	memset(&ctx->ex_data,0,sizeof(CRYPTO_EX_DATA));
+	OPENSSL_cleanse(&ctx->ex_data,sizeof(CRYPTO_EX_DATA));
 	}
 
 void X509_STORE_CTX_set_flags(X509_STORE_CTX *ctx, long flags)
diff --git a/engines/e_4758_cca.c b/engines/e_4758_cca.c
index 84de02df92..091e2dd317 100644
--- a/engines/e_4758_cca.c
+++ b/engines/e_4758_cca.c
@@ -717,7 +717,7 @@ static int cca_rsa_verify(int type, const unsigned char *m, unsigned int m_len,
 
 	if (type == NID_sha1 || type == NID_md5)
 		{
-		memset(hashBuffer, 0, keyLength+1);
+		OPENSSL_cleanse(hashBuffer, keyLength+1);
 		OPENSSL_free(hashBuffer);
 		}
 
@@ -840,7 +840,7 @@ static int cca_rsa_sign(int type, const unsigned char *m, unsigned int m_len,
 
 	if (type == NID_sha1 || type == NID_md5)
 		{
-		memset(hashBuffer, 0, keyLength+1);
+		OPENSSL_cleanse(hashBuffer, keyLength+1);
 		OPENSSL_free(hashBuffer);
 		}
 
diff --git a/engines/e_sureware.c b/engines/e_sureware.c
index 9c2279c195..270ee0934e 100644
--- a/engines/e_sureware.c
+++ b/engines/e_sureware.c
@@ -906,7 +906,7 @@ static int surewarehk_rsa_priv_dec(int flen,const unsigned char *from,unsigned c
 err:
 	if (buf)
 	{
-		memset(buf,0,tlen);
+		OPENSSL_cleanse(buf,tlen);
 		OPENSSL_free(buf);
 	}
 	return ret;
diff --git a/ssl/kssl.c b/ssl/kssl.c
index c294166b9d..1a49f43a83 100644
--- a/ssl/kssl.c
+++ b/ssl/kssl.c
@@ -1550,7 +1550,7 @@ kssl_ctx_free(KSSL_CTX *kssl_ctx)
         {
 	if (kssl_ctx == NULL)  return kssl_ctx;
 
-	if (kssl_ctx->key)  		memset(kssl_ctx->key, 0,
+	if (kssl_ctx->key)  		OPENSSL_cleanse(kssl_ctx->key,
 							      kssl_ctx->length);
 	if (kssl_ctx->key)  		free(kssl_ctx->key);
 	if (kssl_ctx->client_princ) 	free(kssl_ctx->client_princ);
@@ -1654,7 +1654,7 @@ kssl_ctx_setkey(KSSL_CTX *kssl_ctx, krb5_keyblock *session)
 
 	if (kssl_ctx->key)
                 {
-		memset(kssl_ctx->key, 0, kssl_ctx->length);
+		OPENSSL_cleanse(kssl_ctx->key, kssl_ctx->length);
 		free(kssl_ctx->key);
 		}
 
diff --git a/ssl/s2_lib.c b/ssl/s2_lib.c
index 096e38d316..910b9fe097 100644
--- a/ssl/s2_lib.c
+++ b/ssl/s2_lib.c
@@ -308,7 +308,7 @@ void ssl2_free(SSL *s)
 	s2=s->s2;
 	if (s2->rbuf != NULL) OPENSSL_free(s2->rbuf);
 	if (s2->wbuf != NULL) OPENSSL_free(s2->wbuf);
-	memset(s2,0,sizeof *s2);
+	OPENSSL_cleanse(s2,sizeof *s2);
 	OPENSSL_free(s2);
 	s->s2=NULL;
 	}
diff --git a/ssl/s3_clnt.c b/ssl/s3_clnt.c
index 45bea069f2..aff0d9e61b 100644
--- a/ssl/s3_clnt.c
+++ b/ssl/s3_clnt.c
@@ -1657,7 +1657,7 @@ static int ssl3_send_client_key_exchange(SSL *s)
 				s->method->ssl3_enc->generate_master_secret(s,
 					s->session->master_key,
 					tmp_buf,sizeof tmp_buf);
-			memset(tmp_buf,0,sizeof tmp_buf);
+			OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
 			}
 #endif
 #ifndef OPENSSL_NO_KRB5
@@ -1788,8 +1788,8 @@ static int ssl3_send_client_key_exchange(SSL *s)
 					s->session->master_key,
 					tmp_buf, sizeof tmp_buf);
 
-			memset(tmp_buf, 0, sizeof tmp_buf);
-			memset(epms, 0, outl);
+			OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
+			OPENSSL_cleanse(epms, outl);
                         }
 #endif
 #ifndef OPENSSL_NO_DH
diff --git a/ssl/s3_enc.c b/ssl/s3_enc.c
index cec8fcd376..35fde29c8a 100644
--- a/ssl/s3_enc.c
+++ b/ssl/s3_enc.c
@@ -182,7 +182,7 @@ static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num)
 
 		km+=MD5_DIGEST_LENGTH;
 		}
-	memset(smd,0,SHA_DIGEST_LENGTH);
+	OPENSSL_cleanse(smd,SHA_DIGEST_LENGTH);
 	EVP_MD_CTX_cleanup(&m5);
 	EVP_MD_CTX_cleanup(&s1);
 	return 1;
@@ -333,8 +333,8 @@ int ssl3_change_cipher_state(SSL *s, int which)
 
 	EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
 
-	memset(&(exp_key[0]),0,sizeof(exp_key));
-	memset(&(exp_iv[0]),0,sizeof(exp_iv));
+	OPENSSL_cleanse(&(exp_key[0]),sizeof(exp_key));
+	OPENSSL_cleanse(&(exp_iv[0]),sizeof(exp_iv));
 	EVP_MD_CTX_cleanup(&md);
 	return(1);
 err:
@@ -408,7 +408,7 @@ void ssl3_cleanup_key_block(SSL *s)
 	{
 	if (s->s3->tmp.key_block != NULL)
 		{
-		memset(s->s3->tmp.key_block,0,
+		OPENSSL_cleanse(s->s3->tmp.key_block,
 			s->s3->tmp.key_block_length);
 		OPENSSL_free(s->s3->tmp.key_block);
 		s->s3->tmp.key_block=NULL;
diff --git a/ssl/s3_lib.c b/ssl/s3_lib.c
index be4325886d..2145385ccd 100644
--- a/ssl/s3_lib.c
+++ b/ssl/s3_lib.c
@@ -1468,7 +1468,7 @@ void ssl3_free(SSL *s)
 		sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
 	EVP_MD_CTX_cleanup(&s->s3->finish_dgst1);
 	EVP_MD_CTX_cleanup(&s->s3->finish_dgst2);
-	memset(s->s3,0,sizeof *s->s3);
+	OPENSSL_cleanse(s->s3,sizeof *s->s3);
 	OPENSSL_free(s->s3);
 	s->s3=NULL;
 	}
diff --git a/ssl/s3_srvr.c b/ssl/s3_srvr.c
index fbd5ff54da..c687da9b2e 100644
--- a/ssl/s3_srvr.c
+++ b/ssl/s3_srvr.c
@@ -2069,7 +2069,7 @@ static int ssl3_get_client_key_exchange(SSL *s)
                 s->session->master_key_length = s->method->ssl3_enc-> \
 		    generate_master_secret(s, s->session->master_key, p, i);
 		
-                memset(p, 0, i);
+                OPENSSL_cleanse(p, i);
                 return (ret);
 		}
 	else
diff --git a/ssl/ssl_sess.c b/ssl/ssl_sess.c
index a969d8fdce..fbc30b94e6 100644
--- a/ssl/ssl_sess.c
+++ b/ssl/ssl_sess.c
@@ -528,13 +528,13 @@ void SSL_SESSION_free(SSL_SESSION *ss)
 
 	CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data);
 
-	memset(ss->key_arg,0,sizeof ss->key_arg);
-	memset(ss->master_key,0,sizeof ss->master_key);
-	memset(ss->session_id,0,sizeof ss->session_id);
+	OPENSSL_cleanse(ss->key_arg,sizeof ss->key_arg);
+	OPENSSL_cleanse(ss->master_key,sizeof ss->master_key);
+	OPENSSL_cleanse(ss->session_id,sizeof ss->session_id);
 	if (ss->sess_cert != NULL) ssl_sess_cert_free(ss->sess_cert);
 	if (ss->peer != NULL) X509_free(ss->peer);
 	if (ss->ciphers != NULL) sk_SSL_CIPHER_free(ss->ciphers);
-	memset(ss,0,sizeof(*ss));
+	OPENSSL_cleanse(ss,sizeof(*ss));
 	OPENSSL_free(ss);
 	}
 
diff --git a/ssl/t1_enc.c b/ssl/t1_enc.c
index 872c629989..bfcd7d9191 100644
--- a/ssl/t1_enc.c
+++ b/ssl/t1_enc.c
@@ -161,7 +161,7 @@ static void tls1_P_hash(const EVP_MD *md, const unsigned char *sec,
 		}
 	HMAC_CTX_cleanup(&ctx);
 	HMAC_CTX_cleanup(&ctx_tmp);
-	memset(A1,0,sizeof(A1));
+	OPENSSL_cleanse(A1,sizeof(A1));
 	}
 
 static void tls1_PRF(const EVP_MD *md5, const EVP_MD *sha1,
@@ -418,10 +418,10 @@ printf("\niv=");
 printf("\n");
 #endif
 
-	memset(tmp1,0,sizeof(tmp1));
-	memset(tmp2,0,sizeof(tmp1));
-	memset(iv1,0,sizeof(iv1));
-	memset(iv2,0,sizeof(iv2));
+	OPENSSL_cleanse(tmp1,sizeof(tmp1));
+	OPENSSL_cleanse(tmp2,sizeof(tmp1));
+	OPENSSL_cleanse(iv1,sizeof(iv1));
+	OPENSSL_cleanse(iv2,sizeof(iv2));
 	return(1);
 err:
 	SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
@@ -476,7 +476,7 @@ printf("pre-master\n");
 { int z; for (z=0; z<s->session->master_key_length; z++) printf("%02X%c",s->session->master_key[z],((z+1)%16)?' ':'\n'); }
 #endif
 	tls1_generate_key_block(s,p1,p2,num);
-	memset(p2,0,num);
+	OPENSSL_cleanse(p2,num);
 	OPENSSL_free(p2);
 #ifdef TLS_DEBUG
 printf("\nkey block\n");
-- 
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