diff --git a/apps/apps.c b/apps/apps.c
index 1ab07af50b..7667ebef68 100644
--- a/apps/apps.c
+++ b/apps/apps.c
@@ -1411,14 +1411,16 @@ int load_config(BIO *err, CONF *cnf)
 char *make_config_name()
 	{
 	const char *t=X509_get_default_cert_area();
+	size_t len;
 	char *p;
 
-	p=OPENSSL_malloc(strlen(t)+strlen(OPENSSL_CONF)+2);
-	strcpy(p,t);
+	len=strlen(t)+strlen(OPENSSL_CONF)+2;
+	p=OPENSSL_malloc(len);
+	BUF_strlcpy(p,t,len);
 #ifndef OPENSSL_SYS_VMS
-	strcat(p,"/");
+	BUF_strlcat(p,"/",len);
 #endif
-	strcat(p,OPENSSL_CONF);
+	BUF_strlcat(p,OPENSSL_CONF,len);
 
 	return p;
 	}
diff --git a/apps/ca.c b/apps/ca.c
index 7ed60c7a9a..f4573f003a 100644
--- a/apps/ca.c
+++ b/apps/ca.c
@@ -579,16 +579,19 @@ bad:
 	if (configfile == NULL)
 		{
 		const char *s=X509_get_default_cert_area();
+		size_t len;
 
 #ifdef OPENSSL_SYS_VMS
-		tofree=OPENSSL_malloc(strlen(s)+sizeof(CONFIG_FILE));
+		len = strlen(s)+sizeof(CONFIG_FILE);
+		tofree=OPENSSL_malloc(len);
 		strcpy(tofree,s);
 #else
-		tofree=OPENSSL_malloc(strlen(s)+sizeof(CONFIG_FILE)+1);
-		strcpy(tofree,s);
-		strcat(tofree,"/");
+		len = strlen(s)+sizeof(CONFIG_FILE)+1;
+		tofree=OPENSSL_malloc(len);
+		BUF_strlcpy(tofree,s,len);
+		BUF_strlcat(tofree,"/",len);
 #endif
-		strcat(tofree,CONFIG_FILE);
+		BUF_strlcat(tofree,CONFIG_FILE,len);
 		configfile=tofree;
 		}
 
@@ -1312,7 +1315,7 @@ bad:
 #ifdef OPENSSL_SYS_VMS
 			strcat(buf[0],"-new");
 #else
-			strcat(buf[0],".new");
+			BUF_strlcat(buf[0],".new",sizeof(buf[0]));
 #endif
 
 			if (!save_serial(buf[0],serial)) goto err;
@@ -1322,7 +1325,7 @@ bad:
 #ifdef OPENSSL_SYS_VMS
 			strcat(buf[1],"-new");
 #else
-			strcat(buf[1],".new");
+			BUF_strlcat(buf[1],".new",sizeof(buf[1]));
 #endif
 
 			if (BIO_write_filename(out,buf[1]) <= 0)
@@ -1340,7 +1343,7 @@ bad:
 		for (i=0; i<sk_X509_num(cert_sk); i++)
 			{
 			int k;
-			unsigned char *n;
+			char *n;
 
 			x=sk_X509_value(cert_sk,i);
 
@@ -1356,15 +1359,19 @@ bad:
 			strcpy(buf[2],outdir);
 
 #ifndef OPENSSL_SYS_VMS
-			strcat(buf[2],"/");
+			BUF_strlcat(buf[2],"/",sizeof(buf[2]));
 #endif
 
-			n=(unsigned char *)&(buf[2][strlen(buf[2])]);
+			n=(char *)&(buf[2][strlen(buf[2])]);
 			if (j > 0)
 				{
 				for (k=0; k<j; k++)
 					{
-					sprintf((char *)n,"%02X",(unsigned char)*(p++));
+					if (n >= &(buf[2][sizeof(buf[2])]))
+						break;
+					BIO_snprintf(n,
+						     &buf[2][0] + sizeof(buf[2]) - n,
+						     "%02X",(unsigned char)*(p++));
 					n+=2;
 					}
 				}
@@ -1396,7 +1403,7 @@ bad:
 #ifdef OPENSSL_SYS_VMS
 			strcat(buf[2],"-old");
 #else
-			strcat(buf[2],".old");
+			BUF_strlcat(buf[2],".old",sizeof(buf[2]));
 #endif
 
 			BIO_free(in);
@@ -1425,7 +1432,7 @@ bad:
 #ifdef OPENSSL_SYS_VMS
 			strcat(buf[2],"-old");
 #else
-			strcat(buf[2],".old");
+			BUF_strlcat(buf[2],".old",sizeof(buf[2]));
 #endif
 
 			if (rename(dbfile,buf[2]) < 0)
@@ -1595,7 +1602,7 @@ bad:
 
 			strcpy(buf[0],dbfile);
 #ifndef OPENSSL_SYS_VMS
-			strcat(buf[0],".new");
+			BUF_strlcat(buf[0],".new",sizeof(buf[0]));
 #else
 			strcat(buf[0],"-new");
 #endif
@@ -1614,7 +1621,7 @@ bad:
 			strncpy(buf[1],dbfile,BSIZE-4);
 			buf[1][BSIZE-4]='\0';
 #ifndef OPENSSL_SYS_VMS
-			strcat(buf[1],".old");
+			BUF_strlcat(buf[1],".old",sizeof(buf[1]));
 #else
 			strcat(buf[1],"-old");
 #endif
@@ -2352,7 +2359,7 @@ again2:
 		BIO_printf(bio_err,"Memory allocation failure\n");
 		goto err;
 		}
-	strcpy(row[DB_file],"unknown");
+	BUF_strlcpy(row[DB_file],"unknown",8);
 	row[DB_type][0]='V';
 	row[DB_type][1]='\0';
 
@@ -2653,7 +2660,7 @@ static int do_revoke(X509 *x509, TXT_DB *db, int type, char *value)
 			BIO_printf(bio_err,"Memory allocation failure\n");
 			goto err;
 			}
-		strcpy(row[DB_file],"unknown");
+		BUF_strlcpy(row[DB_file],"unknown",8);
 		row[DB_type][0]='V';
 		row[DB_type][1]='\0';
 
@@ -2977,16 +2984,16 @@ char *make_revocation_str(int rev_type, char *rev_arg)
 
 	if (!str) return NULL;
 
-	strcpy(str, (char *)revtm->data);
+	BUF_strlcpy(str, (char *)revtm->data, i);
 	if (reason)
 		{
-		strcat(str, ",");
-		strcat(str, reason);
+		BUF_strlcat(str, ",", i);
+		BUF_strlcat(str, reason, i);
 		}
 	if (other)
 		{
-		strcat(str, ",");
-		strcat(str, other);
+		BUF_strlcat(str, ",", i);
+		BUF_strlcat(str, other, i);
 		}
 	ASN1_UTCTIME_free(revtm);
 	return str;
diff --git a/apps/dgst.c b/apps/dgst.c
index 47d1309b14..be25dafef7 100644
--- a/apps/dgst.c
+++ b/apps/dgst.c
@@ -347,8 +347,9 @@ int MAIN(int argc, char **argv)
 				}
 			if(!out_bin)
 				{
-				tmp=tofree=OPENSSL_malloc(strlen(name)+strlen(argv[i])+5);
-				sprintf(tmp,"%s(%s)= ",name,argv[i]);
+				size_t len = strlen(name)+strlen(argv[i])+5;
+				tmp=tofree=OPENSSL_malloc(len);
+				BIO_snprintf(tmp,len,"%s(%s)= ",name,argv[i]);
 				}
 			else
 				tmp="";
diff --git a/apps/enc.c b/apps/enc.c
index 0a9f7310bf..30378a9542 100644
--- a/apps/enc.c
+++ b/apps/enc.c
@@ -373,9 +373,9 @@ bad:
 			{
 			char buf[200];
 
-			sprintf(buf,"enter %s %s password:",
-				OBJ_nid2ln(EVP_CIPHER_nid(cipher)),
-				(enc)?"encryption":"decryption");
+			BIO_snprintf(buf,sizeof buf,"enter %s %s password:",
+				     OBJ_nid2ln(EVP_CIPHER_nid(cipher)),
+				     (enc)?"encryption":"decryption");
 			strbuf[0]='\0';
 			i=EVP_read_pw_string((char *)strbuf,SIZE,buf,enc);
 			if (i == 0)
diff --git a/apps/engine.c b/apps/engine.c
index c3e1e8de1c..12283d0aed 100644
--- a/apps/engine.c
+++ b/apps/engine.c
@@ -122,8 +122,8 @@ static int append_buf(char **buf, const char *s, int *size, int step)
 		return 0;
 
 	if (**buf != '\0')
-		strcat(*buf, ", ");
-	strcat(*buf, s);
+		BUF_strlcat(*buf, ", ", *size);
+	BUF_strlcat(*buf, s, *size);
 
 	return 1;
 	}
diff --git a/apps/pkcs12.c b/apps/pkcs12.c
index 5136acdc57..71192bdf74 100644
--- a/apps/pkcs12.c
+++ b/apps/pkcs12.c
@@ -557,7 +557,7 @@ int MAIN(int argc, char **argv)
 	    BIO_printf (bio_err, "Can't read Password\n");
 	    goto export_end;
         }
-	if (!twopass) strcpy(macpass, pass);
+	if (!twopass) BUF_strlcpy(macpass, pass, sizeof macpass);
 	/* Turn certbags into encrypted authsafe */
 	authsafe = PKCS12_pack_p7encdata(cert_pbe, cpass, -1, NULL, 0,
 								 iter, bags);
@@ -658,7 +658,7 @@ int MAIN(int argc, char **argv)
     CRYPTO_pop_info();
 #endif
 
-    if (!twopass) strcpy(macpass, pass);
+    if (!twopass) BUF_strlcpy(macpass, pass, sizeof macpass);
 
     if (options & INFO) BIO_printf (bio_err, "MAC Iteration %ld\n", p12->mac->iter ? ASN1_INTEGER_get (p12->mac->iter) : 1);
     if(macver) {
diff --git a/apps/req.c b/apps/req.c
index a657eaa50b..1a3d1d0dfa 100644
--- a/apps/req.c
+++ b/apps/req.c
@@ -1223,34 +1223,34 @@ start:		for (;;)
 				}
 			/* If OBJ not recognised ignore it */
 			if ((nid=OBJ_txt2nid(type)) == NID_undef) goto start;
-
-			if(strlen(v->name) > sizeof buf-9)
+			if (BIO_snprintf(buf,sizeof buf,"%s_default",v->name)
+				>= sizeof buf)
 			   {
 			   BIO_printf(bio_err,"Name '%s' too long\n",v->name);
 			   return 0;
 			   }
 
-			sprintf(buf,"%s_default",v->name);
 			if ((def=NCONF_get_string(req_conf,dn_sect,buf)) == NULL)
 				{
 				ERR_clear_error();
 				def="";
 				}
-			sprintf(buf,"%s_value",v->name);
+				
+			BIO_snprintf(buf,sizeof buf,"%s_value",v->name);
 			if ((value=NCONF_get_string(req_conf,dn_sect,buf)) == NULL)
 				{
 				ERR_clear_error();
 				value=NULL;
 				}
 
-			sprintf(buf,"%s_min",v->name);
+			BIO_snprintf(buf,sizeof buf,"%s_min",v->name);
 			if (!NCONF_get_number(req_conf,dn_sect,buf, &n_min))
 				{
 				ERR_clear_error();
 				n_min = -1;
 				}
 
-			sprintf(buf,"%s_max",v->name);
+			BIO_snprintf(buf,sizeof buf,"%s_max",v->name);
 			if (!NCONF_get_number(req_conf,dn_sect,buf, &n_max))
 				{
 				ERR_clear_error();
@@ -1288,13 +1288,13 @@ start2:			for (;;)
 				if ((nid=OBJ_txt2nid(type)) == NID_undef)
 					goto start2;
 
-				if(strlen(v->name) > sizeof buf-9)
+				if (BIO_snprintf(buf,sizeof buf,"%s_default",type)
+					>= sizeof buf)
 				   {
 				   BIO_printf(bio_err,"Name '%s' too long\n",v->name);
 				   return 0;
 				   }
 
-				sprintf(buf,"%s_default",type);
 				if ((def=NCONF_get_string(req_conf,attr_sect,buf))
 					== NULL)
 					{
@@ -1303,7 +1303,7 @@ start2:			for (;;)
 					}
 				
 				
-				sprintf(buf,"%s_value",type);
+				BIO_snprintf(buf,sizeof buf,"%s_value",type);
 				if ((value=NCONF_get_string(req_conf,attr_sect,buf))
 					== NULL)
 					{
@@ -1311,11 +1311,11 @@ start2:			for (;;)
 					value=NULL;
 					}
 
-				sprintf(buf,"%s_min",type);
+				BIO_snprintf(buf,sizeof buf,"%s_min",type);
 				if (!NCONF_get_number(req_conf,attr_sect,buf, &n_min))
 					n_min = -1;
 
-				sprintf(buf,"%s_max",type);
+				BIO_snprintf(buf,sizeof buf,"%s_max",type);
 				if (!NCONF_get_number(req_conf,attr_sect,buf, &n_max))
 					n_max = -1;
 
@@ -1397,9 +1397,8 @@ start:
 	(void)BIO_flush(bio_err);
 	if(value != NULL)
 		{
-		OPENSSL_assert(strlen(value) < sizeof buf-2);
-		strcpy(buf,value);
-		strcat(buf,"\n");
+		BUF_strlcpy(buf,value,sizeof buf);
+		BUF_strlcat(buf,"\n",sizeof buf);
 		BIO_printf(bio_err,"%s\n",value);
 		}
 	else
@@ -1421,8 +1420,8 @@ start:
 		{
 		if ((def == NULL) || (def[0] == '\0'))
 			return(1);
-		strcpy(buf,def);
-		strcat(buf,"\n");
+		BUF_strlcpy(buf,def,sizeof buf);
+		BUF_strlcat(buf,"\n",sizeof buf);
 		}
 	else if ((buf[0] == '.') && (buf[1] == '\n')) return(1);
 
@@ -1456,9 +1455,8 @@ start:
 	(void)BIO_flush(bio_err);
 	if (value != NULL)
 		{
-		OPENSSL_assert(strlen(value) < sizeof buf-2);
-		strcpy(buf,value);
-		strcat(buf,"\n");
+		BUF_strlcpy(buf,value,sizeof buf);
+		BUF_strlcat(buf,"\n",sizeof buf);
 		BIO_printf(bio_err,"%s\n",value);
 		}
 	else
@@ -1480,8 +1478,8 @@ start:
 		{
 		if ((def == NULL) || (def[0] == '\0'))
 			return(1);
-		strcpy(buf,def);
-		strcat(buf,"\n");
+		BUF_strlcpy(buf,def,sizeof buf);
+		BUF_strlcat(buf,"\n",sizeof buf);
 		}
 	else if ((buf[0] == '.') && (buf[1] == '\n')) return(1);
 
diff --git a/apps/s_socket.c b/apps/s_socket.c
index a88de6c8c8..1867890966 100644
--- a/apps/s_socket.c
+++ b/apps/s_socket.c
@@ -389,7 +389,7 @@ redoit:
 			perror("OPENSSL_malloc");
 			return(0);
 			}
-		strcpy(*host,h1->h_name);
+		BUF_strlcpy(*host,h1->h_name,strlen(h1->h_name)+1);
 
 		h2=GetHostByName(*host);
 		if (h2 == NULL)
diff --git a/apps/s_time.c b/apps/s_time.c
index 1ad16cd607..7d47057465 100644
--- a/apps/s_time.c
+++ b/apps/s_time.c
@@ -502,7 +502,7 @@ int MAIN(int argc, char **argv)
 
 		if (s_www_path != NULL)
 			{
-			sprintf(buf,"GET %s HTTP/1.0\r\n\r\n",s_www_path);
+			BIO_snprintf(buf,sizeof buf,"GET %s HTTP/1.0\r\n\r\n",s_www_path);
 			SSL_write(scon,buf,strlen(buf));
 			while ((i=SSL_read(scon,buf,sizeof(buf))) > 0)
 				bytes_read+=i;
@@ -557,7 +557,7 @@ next:
 
 	if (s_www_path != NULL)
 		{
-		sprintf(buf,"GET %s HTTP/1.0\r\n\r\n",s_www_path);
+		BIO_snprintf(buf,sizeof buf,"GET %s HTTP/1.0\r\n\r\n",s_www_path);
 		SSL_write(scon,buf,strlen(buf));
 		while (SSL_read(scon,buf,sizeof(buf)) > 0)
 			;
@@ -595,7 +595,7 @@ next:
 
 		if (s_www_path)
 			{
-			sprintf(buf,"GET %s HTTP/1.0\r\n\r\n",s_www_path);
+			BIO_snprintf(buf,sizeof buf,"GET %s HTTP/1.0\r\n\r\n",s_www_path);
 			SSL_write(scon,buf,strlen(buf));
 			while ((i=SSL_read(scon,buf,sizeof(buf))) > 0)
 				bytes_read+=i;
diff --git a/apps/x509.c b/apps/x509.c
index 2020b51de0..220fa3c938 100644
--- a/apps/x509.c
+++ b/apps/x509.c
@@ -1029,24 +1029,26 @@ static ASN1_INTEGER *load_serial(char *CAfile, char *serialfile, int create)
 	ASN1_INTEGER *bs = NULL, *bs2 = NULL;
 	BIO *io = NULL;
 	BIGNUM *serial = NULL;
+	size_t len;
 
-	buf=OPENSSL_malloc( ((serialfile == NULL)
-			?(strlen(CAfile)+strlen(POSTFIX)+1)
-			:(strlen(serialfile)))+1);
+	len = ((serialfile == NULL)
+		?(strlen(CAfile)+strlen(POSTFIX)+1)
+		:(strlen(serialfile)))+1;
+	buf=OPENSSL_malloc(len);
 	if (buf == NULL) { BIO_printf(bio_err,"out of mem\n"); goto end; }
 	if (serialfile == NULL)
 		{
-		strcpy(buf,CAfile);
+		BUF_strlcpy(buf,CAfile,len);
 		for (p=buf; *p; p++)
 			if (*p == '.')
 				{
 				*p='\0';
 				break;
 				}
-		strcat(buf,POSTFIX);
+		BUF_strlcat(buf,POSTFIX,len);
 		}
 	else
-		strcpy(buf,serialfile);
+		BUF_strlcpy(buf,serialfile,len);
 	serial=BN_new();
 	bs=ASN1_INTEGER_new();
 	if ((serial == NULL) || (bs == NULL))
diff --git a/crypto/asn1/a_gentm.c b/crypto/asn1/a_gentm.c
index cd09f68b38..1aba86d0db 100644
--- a/crypto/asn1/a_gentm.c
+++ b/crypto/asn1/a_gentm.c
@@ -208,6 +208,7 @@ ASN1_GENERALIZEDTIME *ASN1_GENERALIZEDTIME_set(ASN1_GENERALIZEDTIME *s,
 	char *p;
 	struct tm *ts;
 	struct tm data;
+	size_t len = 20; 
 
 	if (s == NULL)
 		s=M_ASN1_GENERALIZEDTIME_new();
@@ -219,17 +220,17 @@ ASN1_GENERALIZEDTIME *ASN1_GENERALIZEDTIME_set(ASN1_GENERALIZEDTIME *s,
 		return(NULL);
 
 	p=(char *)s->data;
-	if ((p == NULL) || (s->length < 16))
+	if ((p == NULL) || (s->length < len))
 		{
-		p=OPENSSL_malloc(20);
+		p=OPENSSL_malloc(len);
 		if (p == NULL) return(NULL);
 		if (s->data != NULL)
 			OPENSSL_free(s->data);
 		s->data=(unsigned char *)p;
 		}
 
-	sprintf(p,"%04d%02d%02d%02d%02d%02dZ",ts->tm_year + 1900,
-		ts->tm_mon+1,ts->tm_mday,ts->tm_hour,ts->tm_min,ts->tm_sec);
+	BIO_snprintf(p,len,"%04d%02d%02d%02d%02d%02dZ",ts->tm_year + 1900,
+		     ts->tm_mon+1,ts->tm_mday,ts->tm_hour,ts->tm_min,ts->tm_sec);
 	s->length=strlen(p);
 	s->type=V_ASN1_GENERALIZEDTIME;
 #ifdef CHARSET_EBCDIC_not
diff --git a/crypto/asn1/a_mbstr.c b/crypto/asn1/a_mbstr.c
index e8a26af521..208b3ec395 100644
--- a/crypto/asn1/a_mbstr.c
+++ b/crypto/asn1/a_mbstr.c
@@ -145,14 +145,14 @@ int ASN1_mbstring_ncopy(ASN1_STRING **out, const unsigned char *in, int len,
 
 	if((minsize > 0) && (nchar < minsize)) {
 		ASN1err(ASN1_F_ASN1_MBSTRING_COPY, ASN1_R_STRING_TOO_SHORT);
-		sprintf(strbuf, "%ld", minsize);
+		BIO_snprintf(strbuf, sizeof strbuf, "%ld", minsize);
 		ERR_add_error_data(2, "minsize=", strbuf);
 		return -1;
 	}
 
 	if((maxsize > 0) && (nchar > maxsize)) {
 		ASN1err(ASN1_F_ASN1_MBSTRING_COPY, ASN1_R_STRING_TOO_LONG);
-		sprintf(strbuf, "%ld", maxsize);
+		BIO_snprintf(strbuf, sizeof strbuf, "%ld", maxsize);
 		ERR_add_error_data(2, "maxsize=", strbuf);
 		return -1;
 	}
diff --git a/crypto/asn1/a_time.c b/crypto/asn1/a_time.c
index 7348da9457..159681fbcb 100644
--- a/crypto/asn1/a_time.c
+++ b/crypto/asn1/a_time.c
@@ -128,6 +128,7 @@ ASN1_GENERALIZEDTIME *ASN1_TIME_to_generalizedtime(ASN1_TIME *t, ASN1_GENERALIZE
 	{
 	ASN1_GENERALIZEDTIME *ret;
 	char *str;
+	int newlen;
 
 	if (!ASN1_TIME_check(t)) return NULL;
 
@@ -150,12 +151,14 @@ ASN1_GENERALIZEDTIME *ASN1_TIME_to_generalizedtime(ASN1_TIME *t, ASN1_GENERALIZE
 	/* grow the string */
 	if (!ASN1_STRING_set(ret, NULL, t->length + 2))
 		return NULL;
+	/* ASN1_STRING_set() allocated 'len + 1' bytes. */
+	newlen = t->length + 2 + 1;
 	str = (char *)ret->data;
 	/* Work out the century and prepend */
-	if (t->data[0] >= '5') strcpy(str, "19");
-	else strcpy(str, "20");
+	if (t->data[0] >= '5') BUF_strlcpy(str, "19", newlen);
+	else BUF_strlcpy(str, "20", newlen);
 
-	BUF_strlcat(str, (char *)t->data, t->length+3);	/* Include space for a '\0' */
+	BUF_strlcat(str, (char *)t->data, newlen);
 
 	return ret;
 	}
diff --git a/crypto/asn1/a_utctm.c b/crypto/asn1/a_utctm.c
index dbb4a42c9d..6bc609a905 100644
--- a/crypto/asn1/a_utctm.c
+++ b/crypto/asn1/a_utctm.c
@@ -188,6 +188,7 @@ ASN1_UTCTIME *ASN1_UTCTIME_set(ASN1_UTCTIME *s, time_t t)
 	char *p;
 	struct tm *ts;
 	struct tm data;
+	size_t len = 20;
 
 	if (s == NULL)
 		s=M_ASN1_UTCTIME_new();
@@ -199,17 +200,17 @@ ASN1_UTCTIME *ASN1_UTCTIME_set(ASN1_UTCTIME *s, time_t t)
 		return(NULL);
 
 	p=(char *)s->data;
-	if ((p == NULL) || (s->length < 14))
+	if ((p == NULL) || (s->length < len))
 		{
-		p=OPENSSL_malloc(20);
+		p=OPENSSL_malloc(len);
 		if (p == NULL) return(NULL);
 		if (s->data != NULL)
 			OPENSSL_free(s->data);
 		s->data=(unsigned char *)p;
 		}
 
-	sprintf(p,"%02d%02d%02d%02d%02d%02dZ",ts->tm_year%100,
-		ts->tm_mon+1,ts->tm_mday,ts->tm_hour,ts->tm_min,ts->tm_sec);
+	BIO_snprintf(p,len,"%02d%02d%02d%02d%02d%02dZ",ts->tm_year%100,
+		     ts->tm_mon+1,ts->tm_mday,ts->tm_hour,ts->tm_min,ts->tm_sec);
 	s->length=strlen(p);
 	s->type=V_ASN1_UTCTIME;
 #ifdef CHARSET_EBCDIC_not
diff --git a/crypto/asn1/asn1_lib.c b/crypto/asn1/asn1_lib.c
index e30d5dd303..a74f1368d3 100644
--- a/crypto/asn1/asn1_lib.c
+++ b/crypto/asn1/asn1_lib.c
@@ -414,8 +414,8 @@ void asn1_add_error(unsigned char *address, int offset)
 	{
 	char buf1[DECIMAL_SIZE(address)+1],buf2[DECIMAL_SIZE(offset)+1];
 
-	sprintf(buf1,"%lu",(unsigned long)address);
-	sprintf(buf2,"%d",offset);
+	BIO_snprintf(buf1,sizeof buf1,"%lu",(unsigned long)address);
+	BIO_snprintf(buf2,sizeof buf2,"%d",offset);
 	ERR_add_error_data(4,"address=",buf1," offset=",buf2);
 	}
 
diff --git a/crypto/asn1/asn1_par.c b/crypto/asn1/asn1_par.c
index e48532a24d..676d434f03 100644
--- a/crypto/asn1/asn1_par.c
+++ b/crypto/asn1/asn1_par.c
@@ -83,11 +83,11 @@ static int asn1_print_info(BIO *bp, int tag, int xclass, int constructed,
 
 	p=str;
 	if ((xclass & V_ASN1_PRIVATE) == V_ASN1_PRIVATE)
-		sprintf(str,"priv [ %d ] ",tag);
+		BIO_snprintf(str,sizeof str,"priv [ %d ] ",tag);
 	else if ((xclass & V_ASN1_CONTEXT_SPECIFIC) == V_ASN1_CONTEXT_SPECIFIC)
-		sprintf(str,"cont [ %d ]",tag);
+		BIO_snprintf(str,sizeof str,"cont [ %d ]",tag);
 	else if ((xclass & V_ASN1_APPLICATION) == V_ASN1_APPLICATION)
-		sprintf(str,"appl [ %d ]",tag);
+		BIO_snprintf(str,sizeof str,"appl [ %d ]",tag);
 	else p = ASN1_tag2str(tag);
 
 	if (p2 != NULL)
diff --git a/crypto/asn1/t_pkey.c b/crypto/asn1/t_pkey.c
index 4e09c9e44e..d15006e654 100644
--- a/crypto/asn1/t_pkey.c
+++ b/crypto/asn1/t_pkey.c
@@ -139,9 +139,9 @@ int RSA_print(BIO *bp, const RSA *x, int off)
 		}
 
 	if (x->d == NULL)
-		sprintf(str,"Modulus (%d bit):",BN_num_bits(x->n));
+		BIO_snprintf(str,sizeof str,"Modulus (%d bit):",BN_num_bits(x->n));
 	else
-		strcpy(str,"modulus:");
+		BUF_strlcpy(str,"modulus:",sizeof str);
 	if (!print(bp,str,x->n,m,off)) goto err;
 	s=(x->d == NULL)?"Exponent:":"publicExponent:";
 	if (!print(bp,s,x->e,m,off)) goto err;
diff --git a/crypto/asn1/x_long.c b/crypto/asn1/x_long.c
index c04b192794..c5f25956cb 100644
--- a/crypto/asn1/x_long.c
+++ b/crypto/asn1/x_long.c
@@ -104,7 +104,12 @@ static int long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const A
 	long ltmp;
 	unsigned long utmp;
 	int clen, pad, i;
-	ltmp = *(long *)pval;
+	/* this exists to bypass broken gcc optimization */
+	char *cp = (char *)pval;
+
+	/* use memcpy, because we may not be long aligned */
+	memcpy(&ltmp, cp, sizeof(long));
+
 	if(ltmp == it->size) return -1;
 	/* Convert the long to positive: we subtract one if negative so
 	 * we can cleanly handle the padding if only the MSB of the leading
@@ -136,6 +141,7 @@ static int long_c2i(ASN1_VALUE **pval, unsigned char *cont, int len, int utype,
 	int neg, i;
 	long ltmp;
 	unsigned long utmp = 0;
+	char *cp = (char *)pval;
 	if(len > sizeof(long)) {
 		ASN1err(ASN1_F_LONG_C2I, ASN1_R_INTEGER_TOO_LARGE_FOR_LONG);
 		return 0;
@@ -158,6 +164,6 @@ static int long_c2i(ASN1_VALUE **pval, unsigned char *cont, int len, int utype,
 		ASN1err(ASN1_F_LONG_C2I, ASN1_R_INTEGER_TOO_LARGE_FOR_LONG);
 		return 0;
 	}
-	*(long *)pval = ltmp;
+	memcpy(cp, &ltmp, sizeof(long));
 	return 1;
 }
diff --git a/crypto/bio/b_dump.c b/crypto/bio/b_dump.c
index 8397cfab6a..f671e722fa 100644
--- a/crypto/bio/b_dump.c
+++ b/crypto/bio/b_dump.c
@@ -104,38 +104,41 @@ int BIO_dump_indent(BIO *bio, const char *s, int len, int indent)
 	for(i=0;i<rows;i++)
 		{
 		buf[0]='\0';	/* start with empty string */
-		strcpy(buf,str);
-		sprintf(tmp,"%04x - ",i*dump_width);
-		strcat(buf,tmp);
+		BUF_strlcpy(buf,str,sizeof buf);
+		BIO_snprintf(tmp,sizeof tmp,"%04x - ",i*dump_width);
+		BUF_strlcat(buf,tmp,sizeof buf);
 		for(j=0;j<dump_width;j++)
 			{
 			if (((i*dump_width)+j)>=len)
 				{
-				strcat(buf,"   ");
+				BUF_strlcat(buf,"   ",sizeof buf);
 				}
 			else
 				{
 				ch=((unsigned char)*(s+i*dump_width+j)) & 0xff;
-				sprintf(tmp,"%02x%c",ch,j==7?'-':' ');
-				strcat(buf,tmp);
+				BIO_snprintf(tmp,sizeof tmp,"%02x%c",ch,
+					 j==7?'-':' ');
+				BUF_strlcat(buf,tmp,sizeof buf);
 				}
 			}
-		strcat(buf,"  ");
+		BUF_strlcat(buf,"  ",sizeof buf);
 		for(j=0;j<dump_width;j++)
 			{
 			if (((i*dump_width)+j)>=len)
 				break;
 			ch=((unsigned char)*(s+i*dump_width+j)) & 0xff;
 #ifndef CHARSET_EBCDIC
-			sprintf(tmp,"%c",((ch>=' ')&&(ch<='~'))?ch:'.');
+			BIO_snprintf(tmp,sizeof tmp,"%c",
+				 ((ch>=' ')&&(ch<='~'))?ch:'.');
 #else
-			sprintf(tmp,"%c",((ch>=os_toascii[' '])&&(ch<=os_toascii['~']))
-				? os_toebcdic[ch]
-				: '.');
+			BIO_snprintf(tmp,sizeof tmp,"%c",
+				 ((ch>=os_toascii[' '])&&(ch<=os_toascii['~']))
+				 ? os_toebcdic[ch]
+				 : '.');
 #endif
-			strcat(buf,tmp);
+			BUF_strlcat(buf,tmp,sizeof buf);
 			}
-		strcat(buf,"\n");
+		BUF_strlcat(buf,"\n",sizeof buf);
 		/* if this is the last call then update the ddt_dump thing so that
 		 * we will move the selection point in the debug window 
 		 */
@@ -144,7 +147,8 @@ int BIO_dump_indent(BIO *bio, const char *s, int len, int indent)
 #ifdef TRUNCATE
 	if (trunc > 0)
 		{
-		sprintf(buf,"%s%04x - <SPACES/NULS>\n",str,len+trunc);
+		BIO_snprintf(buf,sizeof buf,"%s%04x - <SPACES/NULS>\n",str,
+			 len+trunc);
 		ret+=BIO_write(bio,(char *)buf,strlen(buf));
 		}
 #endif
diff --git a/crypto/bio/b_sock.c b/crypto/bio/b_sock.c
index 601a14f37c..c851298d1e 100644
--- a/crypto/bio/b_sock.c
+++ b/crypto/bio/b_sock.c
@@ -709,12 +709,12 @@ int BIO_accept(int sock, char **addr)
 			}
 		*addr=p;
 		}
-	sprintf(*addr,"%d.%d.%d.%d:%d",
-		(unsigned char)(l>>24L)&0xff,
-		(unsigned char)(l>>16L)&0xff,
-		(unsigned char)(l>> 8L)&0xff,
-		(unsigned char)(l     )&0xff,
-		port);
+	BIO_snprintf(*addr,24,"%d.%d.%d.%d:%d",
+		     (unsigned char)(l>>24L)&0xff,
+		     (unsigned char)(l>>16L)&0xff,
+		     (unsigned char)(l>> 8L)&0xff,
+		     (unsigned char)(l     )&0xff,
+		     port);
 end:
 	return(ret);
 	}
diff --git a/crypto/bio/bio_cb.c b/crypto/bio/bio_cb.c
index 0ffa4d2136..6f4254a114 100644
--- a/crypto/bio/bio_cb.c
+++ b/crypto/bio/bio_cb.c
@@ -70,55 +70,61 @@ long MS_CALLBACK BIO_debug_callback(BIO *bio, int cmd, const char *argp,
 	MS_STATIC char buf[256];
 	char *p;
 	long r=1;
+	size_t p_maxlen;
 
 	if (BIO_CB_RETURN & cmd)
 		r=ret;
 
-	sprintf(buf,"BIO[%08lX]:",(unsigned long)bio);
+	BIO_snprintf(buf,sizeof buf,"BIO[%08lX]:",(unsigned long)bio);
 	p= &(buf[14]);
+	p_maxlen = sizeof buf - 14;
 	switch (cmd)
 		{
 	case BIO_CB_FREE:
-		sprintf(p,"Free - %s\n",bio->method->name);
+		BIO_snprintf(p,p_maxlen,"Free - %s\n",bio->method->name);
 		break;
 	case BIO_CB_READ:
 		if (bio->method->type & BIO_TYPE_DESCRIPTOR)
-			sprintf(p,"read(%d,%d) - %s fd=%d\n",bio->num,argi,bio->method->name,bio->num);
+			BIO_snprintf(p,p_maxlen,"read(%d,%d) - %s fd=%d\n",
+				 bio->num,argi,bio->method->name,bio->num);
 		else
-			sprintf(p,"read(%d,%d) - %s\n",bio->num,argi,bio->method->name);
+			BIO_snprintf(p,p_maxlen,"read(%d,%d) - %s\n",
+				 bio->num,argi,bio->method->name);
 		break;
 	case BIO_CB_WRITE:
 		if (bio->method->type & BIO_TYPE_DESCRIPTOR)
-			sprintf(p,"write(%d,%d) - %s fd=%d\n",bio->num,argi,bio->method->name,bio->num);
+			BIO_snprintf(p,p_maxlen,"write(%d,%d) - %s fd=%d\n",
+				 bio->num,argi,bio->method->name,bio->num);
 		else
-			sprintf(p,"write(%d,%d) - %s\n",bio->num,argi,bio->method->name);
+			BIO_snprintf(p,p_maxlen,"write(%d,%d) - %s\n",
+				 bio->num,argi,bio->method->name);
 		break;
 	case BIO_CB_PUTS:
-		sprintf(p,"puts() - %s\n",bio->method->name);
+		BIO_snprintf(p,p_maxlen,"puts() - %s\n",bio->method->name);
 		break;
 	case BIO_CB_GETS:
-		sprintf(p,"gets(%d) - %s\n",argi,bio->method->name);
+		BIO_snprintf(p,p_maxlen,"gets(%d) - %s\n",argi,bio->method->name);
 		break;
 	case BIO_CB_CTRL:
-		sprintf(p,"ctrl(%d) - %s\n",argi,bio->method->name);
+		BIO_snprintf(p,p_maxlen,"ctrl(%d) - %s\n",argi,bio->method->name);
 		break;
 	case BIO_CB_RETURN|BIO_CB_READ:
-		sprintf(p,"read return %ld\n",ret);
+		BIO_snprintf(p,p_maxlen,"read return %ld\n",ret);
 		break;
 	case BIO_CB_RETURN|BIO_CB_WRITE:
-		sprintf(p,"write return %ld\n",ret);
+		BIO_snprintf(p,p_maxlen,"write return %ld\n",ret);
 		break;
 	case BIO_CB_RETURN|BIO_CB_GETS:
-		sprintf(p,"gets return %ld\n",ret);
+		BIO_snprintf(p,p_maxlen,"gets return %ld\n",ret);
 		break;
 	case BIO_CB_RETURN|BIO_CB_PUTS:
-		sprintf(p,"puts return %ld\n",ret);
+		BIO_snprintf(p,p_maxlen,"puts return %ld\n",ret);
 		break;
 	case BIO_CB_RETURN|BIO_CB_CTRL:
-		sprintf(p,"ctrl return %ld\n",ret);
+		BIO_snprintf(p,p_maxlen,"ctrl return %ld\n",ret);
 		break;
 	default:
-		sprintf(p,"bio callback - unknown type (%d)\n",cmd);
+		BIO_snprintf(p,p_maxlen,"bio callback - unknown type (%d)\n",cmd);
 		break;
 		}
 
diff --git a/crypto/bio/bss_conn.c b/crypto/bio/bss_conn.c
index 743db6ff94..f5d0e759e2 100644
--- a/crypto/bio/bss_conn.c
+++ b/crypto/bio/bss_conn.c
@@ -521,8 +521,8 @@ static long conn_ctrl(BIO *b, int cmd, long num, void *ptr)
 				char buf[16];
 				unsigned char *p = ptr;
 
-				sprintf(buf,"%d.%d.%d.%d",
-					p[0],p[1],p[2],p[3]);
+				BIO_snprintf(buf,sizeof buf,"%d.%d.%d.%d",
+					     p[0],p[1],p[2],p[3]);
 				if (data->param_hostname != NULL)
 					OPENSSL_free(data->param_hostname);
 				data->param_hostname=BUF_strdup(buf);
@@ -532,7 +532,7 @@ static long conn_ctrl(BIO *b, int cmd, long num, void *ptr)
 				{
 				char buf[DECIMAL_SIZE(int)+1];
 
-				sprintf(buf,"%d",*(int *)ptr);
+				BIO_snprintf(buf,sizeof buf,"%d",*(int *)ptr);
 				if (data->param_port != NULL)
 					OPENSSL_free(data->param_port);
 				data->param_port=BUF_strdup(buf);
diff --git a/crypto/bio/bss_file.c b/crypto/bio/bss_file.c
index 6904b5c081..9cdf159f82 100644
--- a/crypto/bio/bss_file.c
+++ b/crypto/bio/bss_file.c
@@ -249,15 +249,15 @@ static long MS_CALLBACK file_ctrl(BIO *b, int cmd, long num, void *ptr)
 		if (num & BIO_FP_APPEND)
 			{
 			if (num & BIO_FP_READ)
-				strcpy(p,"a+");
-			else	strcpy(p,"a");
+				BUF_strlcpy(p,"a+",sizeof p);
+			else	BUF_strlcpy(p,"a",sizeof p);
 			}
 		else if ((num & BIO_FP_READ) && (num & BIO_FP_WRITE))
-			strcpy(p,"r+");
+			BUF_strlcpy(p,"r+",sizeof p);
 		else if (num & BIO_FP_WRITE)
-			strcpy(p,"w");
+			BUF_strlcpy(p,"w",sizeof p);
 		else if (num & BIO_FP_READ)
-			strcpy(p,"r");
+			BUF_strlcpy(p,"r",sizeof p);
 		else
 			{
 			BIOerr(BIO_F_FILE_CTRL,BIO_R_BAD_FOPEN_MODE);
diff --git a/crypto/bn/bn_lib.c b/crypto/bn/bn_lib.c
index fa0ff485ad..e1660450bc 100644
--- a/crypto/bn/bn_lib.c
+++ b/crypto/bn/bn_lib.c
@@ -145,11 +145,11 @@ char *BN_options(void)
 		{
 		init++;
 #ifdef BN_LLONG
-		sprintf(data,"bn(%d,%d)",(int)sizeof(BN_ULLONG)*8,
-			(int)sizeof(BN_ULONG)*8);
+		BIO_snprintf(data,sizeof data,"bn(%d,%d)",
+			     (int)sizeof(BN_ULLONG)*8,(int)sizeof(BN_ULONG)*8);
 #else
-		sprintf(data,"bn(%d,%d)",(int)sizeof(BN_ULONG)*8,
-			(int)sizeof(BN_ULONG)*8);
+		BIO_snprintf(data,sizeof data,"bn(%d,%d)",
+			     (int)sizeof(BN_ULONG)*8,(int)sizeof(BN_ULONG)*8);
 #endif
 		}
 	return(data);
diff --git a/crypto/bn/bn_print.c b/crypto/bn/bn_print.c
index 5f46b1826c..0d942603b1 100644
--- a/crypto/bn/bn_print.c
+++ b/crypto/bn/bn_print.c
@@ -119,6 +119,7 @@ char *BN_bn2dec(const BIGNUM *a)
 		}
 	if ((t=BN_dup(a)) == NULL) goto err;
 
+#define BUF_REMAIN (num+3 - (size_t)(p - buf))
 	p=buf;
 	lp=bn_data;
 	if (t->neg) *(p++)='-';
@@ -139,12 +140,12 @@ char *BN_bn2dec(const BIGNUM *a)
 		/* We now have a series of blocks, BN_DEC_NUM chars
 		 * in length, where the last one needs truncation.
 		 * The blocks need to be reversed in order. */
-		sprintf(p,BN_DEC_FMT1,*lp);
+		BIO_snprintf(p,BUF_REMAIN,BN_DEC_FMT1,*lp);
 		while (*p) p++;
 		while (lp != bn_data)
 			{
 			lp--;
-			sprintf(p,BN_DEC_FMT2,*lp);
+			BIO_snprintf(p,BUF_REMAIN,BN_DEC_FMT2,*lp);
 			while (*p) p++;
 			}
 		}
diff --git a/crypto/conf/conf_def.c b/crypto/conf/conf_def.c
index 57d2739ae0..2e9f52f1fd 100644
--- a/crypto/conf/conf_def.c
+++ b/crypto/conf/conf_def.c
@@ -235,7 +235,7 @@ static int def_load_bio(CONF *conf, BIO *in, long *line)
 		CONFerr(CONF_F_CONF_LOAD_BIO,ERR_R_MALLOC_FAILURE);
 		goto err;
 		}
-	strcpy(section,"default");
+	BUF_strlcpy(section,"default",10);
 
 	if (_CONF_new_data(conf) == 0)
 		{
@@ -392,7 +392,7 @@ again:
 							ERR_R_MALLOC_FAILURE);
 				goto err;
 				}
-			strcpy(v->name,pname);
+			BUF_strlcpy(v->name,pname,strlen(pname)+1);
 			if (!str_copy(conf,psection,&(v->value),start)) goto err;
 
 			if (strcmp(psection,section) != 0)
@@ -447,7 +447,7 @@ err:
 	if (buff != NULL) BUF_MEM_free(buff);
 	if (section != NULL) OPENSSL_free(section);
 	if (line != NULL) *line=eline;
-	sprintf(btmp,"%ld",eline);
+	BIO_snprintf(btmp,sizeof btmp,"%ld",eline);
 	ERR_add_error_data(2,"line ",btmp);
 	if ((h != conf->data) && (conf->data != NULL))
 		{
diff --git a/crypto/conf/conf_mod.c b/crypto/conf/conf_mod.c
index 8ceab6a21f..d45adea851 100644
--- a/crypto/conf/conf_mod.c
+++ b/crypto/conf/conf_mod.c
@@ -232,7 +232,7 @@ static int module_run(const CONF *cnf, char *name, char *value,
 			{
 			char rcode[DECIMAL_SIZE(ret)+1];
 			CONFerr(CONF_F_CONF_MODULES_LOAD, CONF_R_MODULE_INITIALIZATION_ERROR);
-			sprintf(rcode, "%-8d", ret);
+			BIO_snprintf(rcode, sizeof rcode, "%-8d", ret);
 			ERR_add_error_data(6, "module=", name, ", value=", value, ", retcode=", rcode);
 			}
 		}
@@ -561,11 +561,11 @@ char *CONF_get1_default_config_file(void)
 
 	if (!file)
 		return NULL;
-	strcpy(file,X509_get_default_cert_area());
+	BUF_strlcpy(file,X509_get_default_cert_area(),len + 1);
 #ifndef OPENSSL_SYS_VMS
-	strcat(file,"/");
+	BUF_strlcat(file,"/",len + 1);
 #endif
-	strcat(file,OPENSSL_CONF);
+	BUF_strlcat(file,OPENSSL_CONF,len + 1);
 
 	return file;
 	}
diff --git a/crypto/cversion.c b/crypto/cversion.c
index 8ecfba7b16..beeeb14013 100644
--- a/crypto/cversion.c
+++ b/crypto/cversion.c
@@ -61,7 +61,9 @@
 #include "cryptlib.h"
 #include <openssl/crypto.h>
 
+#ifndef NO_WINDOWS_BRAINDEATH
 #include "buildinf.h"
+#endif
 
 const char *SSLeay_version(int t)
 	{
@@ -72,7 +74,7 @@ const char *SSLeay_version(int t)
 #ifdef DATE
 		static char buf[sizeof(DATE)+11];
 
-		sprintf(buf,"built on: %s",DATE);
+		BIO_snprintf(buf,sizeof buf,"built on: %s",DATE);
 		return(buf);
 #else
 		return("built on: date not available");
@@ -83,7 +85,7 @@ const char *SSLeay_version(int t)
 #ifdef CFLAGS
 		static char buf[sizeof(CFLAGS)+11];
 
-		sprintf(buf,"compiler: %s",CFLAGS);
+		BIO_snprintf(buf,sizeof buf,"compiler: %s",CFLAGS);
 		return(buf);
 #else
 		return("compiler: information not available");
@@ -94,7 +96,7 @@ const char *SSLeay_version(int t)
 #ifdef PLATFORM
 		static char buf[sizeof(PLATFORM)+11];
 
-		sprintf(buf,"platform: %s", PLATFORM);
+		BIO_snprintf(buf,sizeof buf,"platform: %s", PLATFORM);
 		return(buf);
 #else
 		return("platform: information not available");
diff --git a/crypto/des/ecb_enc.c b/crypto/des/ecb_enc.c
index 1b70f68806..784aa5ba23 100644
--- a/crypto/des/ecb_enc.c
+++ b/crypto/des/ecb_enc.c
@@ -60,6 +60,7 @@
 #include "des_ver.h"
 #include "spr.h"
 #include <openssl/opensslv.h>
+#include <openssl/bio.h>
 
 OPENSSL_GLOBAL const char *libdes_version="libdes" OPENSSL_VERSION_PTEXT;
 OPENSSL_GLOBAL const char *DES_version="DES" OPENSSL_VERSION_PTEXT;
@@ -97,7 +98,8 @@ const char *DES_options(void)
 			size="int";
 		else
 			size="long";
-		sprintf(buf,"des(%s,%s,%s,%s)",ptr,risc,unroll,size);
+		BIO_snprintf(buf,sizeof buf,"des(%s,%s,%s,%s)",ptr,risc,unroll,
+			     size);
 		init=0;
 		}
 	return(buf);
diff --git a/crypto/dso/dso_lib.c b/crypto/dso/dso_lib.c
index 556069b9b8..48d9fdb25e 100644
--- a/crypto/dso/dso_lib.c
+++ b/crypto/dso/dso_lib.c
@@ -383,7 +383,7 @@ int DSO_set_filename(DSO *dso, const char *filename)
 		DSOerr(DSO_F_DSO_SET_FILENAME,ERR_R_MALLOC_FAILURE);
 		return(0);
 		}
-	strcpy(copied, filename);
+	BUF_strlcpy(copied, filename, strlen(filename) + 1);
 	if(dso->filename)
 		OPENSSL_free(dso->filename);
 	dso->filename = copied;
@@ -422,7 +422,7 @@ char *DSO_convert_filename(DSO *dso, const char *filename)
 					ERR_R_MALLOC_FAILURE);
 			return(NULL);
 			}
-		strcpy(result, filename);
+		BUF_strlcpy(result, filename, strlen(filename) + 1);
 		}
 	return(result);
 	}
diff --git a/crypto/engine/eng_ctrl.c b/crypto/engine/eng_ctrl.c
index ad3858395b..412c73fb0f 100644
--- a/crypto/engine/eng_ctrl.c
+++ b/crypto/engine/eng_ctrl.c
@@ -160,15 +160,19 @@ static int int_ctrl_helper(ENGINE *e, int cmd, long i, void *p, void (*f)())
 	case ENGINE_CTRL_GET_NAME_LEN_FROM_CMD:
 		return strlen(e->cmd_defns[idx].cmd_name);
 	case ENGINE_CTRL_GET_NAME_FROM_CMD:
-		return sprintf(s, "%s", e->cmd_defns[idx].cmd_name);
+		return BIO_snprintf(s,strlen(e->cmd_defns[idx].cmd_name) + 1,
+				    "%s", e->cmd_defns[idx].cmd_name);
 	case ENGINE_CTRL_GET_DESC_LEN_FROM_CMD:
 		if(e->cmd_defns[idx].cmd_desc)
 			return strlen(e->cmd_defns[idx].cmd_desc);
 		return strlen(int_no_description);
 	case ENGINE_CTRL_GET_DESC_FROM_CMD:
 		if(e->cmd_defns[idx].cmd_desc)
-			return sprintf(s, "%s", e->cmd_defns[idx].cmd_desc);
-		return sprintf(s, "%s", int_no_description);
+			return BIO_snprintf(s,
+					    strlen(e->cmd_defns[idx].cmd_desc) + 1,
+					    "%s", e->cmd_defns[idx].cmd_desc);
+		return BIO_snprintf(s, strlen(int_no_description) + 1,"%s",
+				    int_no_description);
 	case ENGINE_CTRL_GET_CMD_FLAGS:
 		return e->cmd_defns[idx].cmd_flags;
 		}
diff --git a/crypto/err/err.c b/crypto/err/err.c
index 633a1addfe..792f329600 100644
--- a/crypto/err/err.c
+++ b/crypto/err/err.c
@@ -1065,7 +1065,7 @@ void ERR_add_error_data(int num, ...)
 				else
 					str=p;
 				}
-			strcat(str,a);
+			BUF_strlcat(str,a,s+1);
 			}
 		}
 	ERR_set_error_data(str,ERR_TXT_MALLOCED|ERR_TXT_STRING);
diff --git a/crypto/evp/evp_pbe.c b/crypto/evp/evp_pbe.c
index 0da88fdcff..91e545a141 100644
--- a/crypto/evp/evp_pbe.c
+++ b/crypto/evp/evp_pbe.c
@@ -87,7 +87,7 @@ int EVP_PBE_CipherInit (ASN1_OBJECT *pbe_obj, const char *pass, int passlen,
 	if (i == -1) {
 		char obj_tmp[80];
 		EVPerr(EVP_F_EVP_PBE_CIPHERINIT,EVP_R_UNKNOWN_PBE_ALGORITHM);
-		if (!pbe_obj) strcpy (obj_tmp, "NULL");
+		if (!pbe_obj) BUF_strlcpy (obj_tmp, "NULL", sizeof obj_tmp);
 		else i2t_ASN1_OBJECT(obj_tmp, sizeof obj_tmp, pbe_obj);
 		ERR_add_error_data(2, "TYPE=", obj_tmp);
 		return 0;
diff --git a/crypto/evp/evp_pkey.c b/crypto/evp/evp_pkey.c
index 34b5b1d21c..eb481ec661 100644
--- a/crypto/evp/evp_pkey.c
+++ b/crypto/evp/evp_pkey.c
@@ -210,7 +210,7 @@ EVP_PKEY *EVP_PKCS82PKEY (PKCS8_PRIV_KEY_INFO *p8)
 #endif
 		default:
 		EVPerr(EVP_F_EVP_PKCS82PKEY, EVP_R_UNSUPPORTED_PRIVATE_KEY_ALGORITHM);
-		if (!a->algorithm) strcpy (obj_tmp, "NULL");
+		if (!a->algorithm) BUF_strlcpy (obj_tmp, "NULL", sizeof obj_tmp);
 		else i2t_ASN1_OBJECT(obj_tmp, 80, a->algorithm);
 		ERR_add_error_data(2, "TYPE=", obj_tmp);
 		EVP_PKEY_free (pkey);
diff --git a/crypto/mem_dbg.c b/crypto/mem_dbg.c
index 57bd08f65d..e212de27e4 100644
--- a/crypto/mem_dbg.c
+++ b/crypto/mem_dbg.c
@@ -597,6 +597,8 @@ static void print_leak(const MEM *m, MEM_LEAK *l)
 	struct tm *lcl = NULL;
 	unsigned long ti;
 
+#define BUF_REMAIN (sizeof buf - (size_t)(bufp - buf))
+
 	if(m->addr == (char *)l->bio)
 	    return;
 
@@ -604,22 +606,22 @@ static void print_leak(const MEM *m, MEM_LEAK *l)
 		{
 		lcl = localtime(&m->time);
 	
-		sprintf(bufp, "[%02d:%02d:%02d] ",
+		BIO_snprintf(bufp, BUF_REMAIN, "[%02d:%02d:%02d] ",
 			lcl->tm_hour,lcl->tm_min,lcl->tm_sec);
 		bufp += strlen(bufp);
 		}
 
-	sprintf(bufp, "%5lu file=%s, line=%d, ",
+	BIO_snprintf(bufp, BUF_REMAIN, "%5lu file=%s, line=%d, ",
 		m->order,m->file,m->line);
 	bufp += strlen(bufp);
 
 	if (options & V_CRYPTO_MDEBUG_THREAD)
 		{
-		sprintf(bufp, "thread=%lu, ", m->thread);
+		BIO_snprintf(bufp, BUF_REMAIN, "thread=%lu, ", m->thread);
 		bufp += strlen(bufp);
 		}
 
-	sprintf(bufp, "number=%d, address=%08lX\n",
+	BIO_snprintf(bufp, BUF_REMAIN, "number=%d, address=%08lX\n",
 		m->num,(unsigned long)m->addr);
 	bufp += strlen(bufp);
 
@@ -641,7 +643,7 @@ static void print_leak(const MEM *m, MEM_LEAK *l)
 
 		ami_cnt++;
 		memset(buf,'>',ami_cnt);
-		sprintf(buf + ami_cnt,
+		BIO_snprintf(buf + ami_cnt, sizeof buf - ami_cnt,
 			" thread=%lu, file=%s, line=%d, info=\"",
 			amip->thread, amip->file, amip->line);
 		buf_len=strlen(buf);
@@ -653,10 +655,11 @@ static void print_leak(const MEM *m, MEM_LEAK *l)
 			}
 		else
 			{
-			strcpy(buf + buf_len, amip->info);
+			BUF_strlcpy(buf + buf_len, amip->info,
+				    sizeof buf - buf_len);
 			buf_len = strlen(buf);
 			}
-		sprintf(buf + buf_len, "\"\n");
+		BIO_snprintf(buf + buf_len, sizeof buf - buf_len, "\"\n");
 		
 		BIO_puts(l->bio,buf);
 
diff --git a/crypto/objects/obj_dat.c b/crypto/objects/obj_dat.c
index 5d983e3ed4..4534dc0985 100644
--- a/crypto/objects/obj_dat.c
+++ b/crypto/objects/obj_dat.c
@@ -462,7 +462,7 @@ int OBJ_obj2txt(char *buf, int buf_len, const ASN1_OBJECT *a, int no_name)
 		if (i > 2) i=2;
 		l-=(long)(i*40);
 
-		sprintf(tbuf,"%d.%lu",i,l);
+		BIO_snprintf(tbuf,sizeof tbuf,"%d.%lu",i,l);
 		i=strlen(tbuf);
 		BUF_strlcpy(buf,tbuf,buf_len);
 		buf_len-=i;
@@ -473,7 +473,7 @@ int OBJ_obj2txt(char *buf, int buf_len, const ASN1_OBJECT *a, int no_name)
 		for (; idx<len; idx++) {
 			l|=p[idx]&0x7f;
 			if (!(p[idx] & 0x80)) {
-				sprintf(tbuf,".%lu",l);
+				BIO_snprintf(tbuf,sizeof tbuf,".%lu",l);
 				i=strlen(tbuf);
 				if (buf_len > 0)
 					BUF_strlcpy(buf,tbuf,buf_len);
diff --git a/crypto/pem/pem_lib.c b/crypto/pem/pem_lib.c
index 70b5446797..9a031ce214 100644
--- a/crypto/pem/pem_lib.c
+++ b/crypto/pem/pem_lib.c
@@ -131,9 +131,9 @@ void PEM_proc_type(char *buf, int type)
 	else
 		str="BAD-TYPE";
 		
-	strcat(buf,"Proc-Type: 4,");
-	strcat(buf,str);
-	strcat(buf,"\n");
+	BUF_strlcat(buf,"Proc-Type: 4,",PEM_BUFSIZE);
+	BUF_strlcat(buf,str,PEM_BUFSIZE);
+	BUF_strlcat(buf,"\n",PEM_BUFSIZE);
 	}
 
 void PEM_dek_info(char *buf, const char *type, int len, char *str)
@@ -142,10 +142,12 @@ void PEM_dek_info(char *buf, const char *type, int len, char *str)
 	long i;
 	int j;
 
-	strcat(buf,"DEK-Info: ");
-	strcat(buf,type);
-	strcat(buf,",");
+	BUF_strlcat(buf,"DEK-Info: ",PEM_BUFSIZE);
+	BUF_strlcat(buf,type,PEM_BUFSIZE);
+	BUF_strlcat(buf,",",PEM_BUFSIZE);
 	j=strlen(buf);
+	if (j + (len * 2) + 1 > PEM_BUFSIZE)
+        	return;
 	for (i=0; i<len; i++)
 		{
 		buf[j+i*2]  =map[(str[i]>>4)&0x0f];
diff --git a/crypto/rand/rand_egd.c b/crypto/rand/rand_egd.c
index 1f168221e3..6f742900a0 100644
--- a/crypto/rand/rand_egd.c
+++ b/crypto/rand/rand_egd.c
@@ -56,6 +56,7 @@
 
 #include <openssl/e_os2.h>
 #include <openssl/rand.h>
+#include <openssl/buffer.h>
 
 /*
  * Query the EGD <URL: http://www.lothar.com/tech/crypto/>.
@@ -145,7 +146,7 @@ int RAND_query_egd_bytes(const char *path, unsigned char *buf, int bytes)
 	addr.sun_family = AF_UNIX;
 	if (strlen(path) >= sizeof(addr.sun_path))
 		return (-1);
-	strcpy(addr.sun_path,path);
+	BUF_strlcpy(addr.sun_path,path,sizeof addr.sun_path);
 	len = offsetof(struct sockaddr_un, sun_path) + strlen(path);
 	fd = socket(AF_UNIX, SOCK_STREAM, 0);
 	if (fd == -1) return (-1);
diff --git a/crypto/ui/ui_lib.c b/crypto/ui/ui_lib.c
index 13e5f20dcb..dbc9711a2d 100644
--- a/crypto/ui/ui_lib.c
+++ b/crypto/ui/ui_lib.c
@@ -430,14 +430,14 @@ char *UI_construct_prompt(UI *ui, const char *object_desc,
 		len += sizeof(prompt3) - 1;
 
 		prompt = (char *)OPENSSL_malloc(len + 1);
-		strcpy(prompt, prompt1);
-		strcat(prompt, object_desc);
+		BUF_strlcpy(prompt, prompt1, len + 1);
+		BUF_strlcat(prompt, object_desc, len + 1);
 		if (object_name)
 			{
-			strcat(prompt, prompt2);
-			strcat(prompt, object_name);
+			BUF_strlcat(prompt, prompt2, len + 1);
+			BUF_strlcat(prompt, object_name, len + 1);
 			}
-		strcat(prompt, prompt3);
+		BUF_strlcat(prompt, prompt3, len + 1);
 		}
 	return prompt;
 	}
@@ -865,7 +865,8 @@ int UI_set_result(UI *ui, UI_STRING *uis, const char *result)
 			return -1;
 			}
 
-		strcpy(uis->result_buf, result);
+		BUF_strlcpy(uis->result_buf, result,
+			    uis->_.string_data.result_maxsize + 1);
 		break;
 	case UIT_BOOLEAN:
 		{
diff --git a/crypto/x509/by_dir.c b/crypto/x509/by_dir.c
index 448bd7e69c..a9752d6a03 100644
--- a/crypto/x509/by_dir.c
+++ b/crypto/x509/by_dir.c
@@ -302,8 +302,9 @@ static int get_cert_by_subject(X509_LOOKUP *xl, int type, X509_NAME *name,
 		k=0;
 		for (;;)
 			{
-			sprintf(b->data,"%s/%08lx.%s%d",ctx->dirs[i],h,
-				postfix,k);
+			BIO_snprintf(b->data,b->max,
+				     "%s/%08lx.%s%d",ctx->dirs[i],h,
+				     postfix,k);
 			k++;
 			if (stat(b->data,&st) < 0)
 				break;
diff --git a/crypto/x509/x509_txt.c b/crypto/x509/x509_txt.c
index 4f83db8ba2..5a945a70fb 100644
--- a/crypto/x509/x509_txt.c
+++ b/crypto/x509/x509_txt.c
@@ -148,7 +148,7 @@ const char *X509_verify_cert_error_string(long n)
 		return("unhandled critical extension");
 
 	default:
-		sprintf(buf,"error number %ld",n);
+		BIO_snprintf(buf,sizeof buf,"error number %ld",n);
 		return(buf);
 		}
 	}
diff --git a/crypto/x509v3/v3_alt.c b/crypto/x509v3/v3_alt.c
index 0e9e7dcb4f..58b935a3b6 100644
--- a/crypto/x509v3/v3_alt.c
+++ b/crypto/x509v3/v3_alt.c
@@ -137,7 +137,8 @@ STACK_OF(CONF_VALUE) *i2v_GENERAL_NAME(X509V3_EXT_METHOD *method,
 			X509V3_add_value("IP Address","<invalid>", &ret);
 			break;
 		}
-		sprintf(oline, "%d.%d.%d.%d", p[0], p[1], p[2], p[3]);
+		BIO_snprintf(oline, sizeof oline,
+			     "%d.%d.%d.%d", p[0], p[1], p[2], p[3]);
 		X509V3_add_value("IP Address",oline, &ret);
 		break;
 
diff --git a/crypto/x509v3/v3_info.c b/crypto/x509v3/v3_info.c
index e269df1373..53e3f48859 100644
--- a/crypto/x509v3/v3_info.c
+++ b/crypto/x509v3/v3_info.c
@@ -105,7 +105,7 @@ static STACK_OF(CONF_VALUE) *i2v_AUTHORITY_INFO_ACCESS(X509V3_EXT_METHOD *method
 						STACK_OF(CONF_VALUE) *ret)
 {
 	ACCESS_DESCRIPTION *desc;
-	int i;
+	int i,nlen;
 	char objtmp[80], *ntmp;
 	CONF_VALUE *vtmp;
 	for(i = 0; i < sk_ACCESS_DESCRIPTION_num(ainfo); i++) {
@@ -114,15 +114,16 @@ static STACK_OF(CONF_VALUE) *i2v_AUTHORITY_INFO_ACCESS(X509V3_EXT_METHOD *method
 		if(!ret) break;
 		vtmp = sk_CONF_VALUE_value(ret, i);
 		i2t_ASN1_OBJECT(objtmp, sizeof objtmp, desc->method);
-		ntmp = OPENSSL_malloc(strlen(objtmp) + strlen(vtmp->name) + 5);
+		nlen = strlen(objtmp) + strlen(vtmp->name) + 5;
+		ntmp = OPENSSL_malloc(nlen);
 		if(!ntmp) {
 			X509V3err(X509V3_F_I2V_AUTHORITY_INFO_ACCESS,
 					ERR_R_MALLOC_FAILURE);
 			return NULL;
 		}
-		strcpy(ntmp, objtmp);
-		strcat(ntmp, " - ");
-		strcat(ntmp, vtmp->name);
+		BUF_strlcpy(ntmp, objtmp, nlen);
+		BUF_strlcat(ntmp, " - ", nlen);
+		BUF_strlcat(ntmp, vtmp->name, nlen);
 		OPENSSL_free(vtmp->name);
 		vtmp->name = ntmp;