diff -up ext/openssl/ossl.c.ossl10 ext/openssl/ossl.c
--- ext/openssl/ossl.c.ossl10	2007-02-13 00:01:19.000000000 +0100
+++ ext/openssl/ossl.c	2009-08-26 12:29:41.000000000 +0200
@@ -92,7 +92,7 @@ ossl_x509_ary2sk(VALUE ary)
 
 #define OSSL_IMPL_SK2ARY(name, type)	        \
 VALUE						\
-ossl_##name##_sk2ary(STACK *sk)			\
+ossl_##name##_sk2ary(STACK_OF(type) *sk)	\
 {						\
     type *t;					\
     int i, num;					\
@@ -102,7 +102,7 @@ ossl_##name##_sk2ary(STACK *sk)			\
 	OSSL_Debug("empty sk!");		\
 	return Qnil;				\
     }						\
-    num = sk_num(sk);				\
+    num = sk_##type##_num(sk);			\
     if (num < 0) {				\
 	OSSL_Debug("items in sk < -1???");	\
 	return rb_ary_new();			\
@@ -110,7 +110,7 @@ ossl_##name##_sk2ary(STACK *sk)			\
     ary = rb_ary_new2(num);			\
 						\
     for (i=0; i<num; i++) {			\
-	t = (type *)sk_value(sk, i);		\
+	t = sk_##type##_value(sk, i);		\
 	rb_ary_push(ary, ossl_##name##_new(t));	\
     }						\
     return ary;					\
diff -up ext/openssl/ossl_pkcs7.c.ossl10 ext/openssl/ossl_pkcs7.c
--- ext/openssl/ossl_pkcs7.c.ossl10	2007-02-13 00:01:19.000000000 +0100
+++ ext/openssl/ossl_pkcs7.c	2009-08-26 12:53:05.000000000 +0200
@@ -543,12 +543,11 @@ ossl_pkcs7_add_certificate(VALUE self, V
     return self;
 }
 
-static STACK *
-pkcs7_get_certs_or_crls(VALUE self, int want_certs)
+static STACK_OF(X509) *
+pkcs7_get_certs(VALUE self)
 {
     PKCS7 *pkcs7;
     STACK_OF(X509) *certs;
-    STACK_OF(X509_CRL) *crls;
     int i;
 
     GetPKCS7(self, pkcs7);
@@ -556,17 +555,38 @@ pkcs7_get_certs_or_crls(VALUE self, int 
     switch(i){
     case NID_pkcs7_signed:
         certs = pkcs7->d.sign->cert;
-        crls = pkcs7->d.sign->crl;
         break;
     case NID_pkcs7_signedAndEnveloped:
         certs = pkcs7->d.signed_and_enveloped->cert;
+        break;
+    default:
+        certs = NULL;
+    }
+
+    return certs;
+}
+
+static STACK_OF(X509_CRL) *
+pkcs7_get_crls(VALUE self)
+{
+    PKCS7 *pkcs7;
+    STACK_OF(X509_CRL) *crls;
+    int i;
+
+    GetPKCS7(self, pkcs7);
+    i = OBJ_obj2nid(pkcs7->type);
+    switch(i){
+    case NID_pkcs7_signed:
+        crls = pkcs7->d.sign->crl;
+        break;
+    case NID_pkcs7_signedAndEnveloped:
         crls = pkcs7->d.signed_and_enveloped->crl;
         break;
     default:
-        certs = crls = NULL;
+        crls = NULL;
     }
 
-    return want_certs ? certs : crls;
+    return crls;
 }
 
 static VALUE
@@ -581,7 +601,7 @@ ossl_pkcs7_set_certificates(VALUE self, 
     STACK_OF(X509) *certs;
     X509 *cert;
 
-    certs = pkcs7_get_certs_or_crls(self, 1);
+    certs = pkcs7_get_certs(self);
     while((cert = sk_X509_pop(certs))) X509_free(cert);
     rb_iterate(rb_each, ary, ossl_pkcs7_set_certs_i, self);
 
@@ -591,7 +611,7 @@ ossl_pkcs7_set_certificates(VALUE self, 
 static VALUE
 ossl_pkcs7_get_certificates(VALUE self)
 {
-    return ossl_x509_sk2ary(pkcs7_get_certs_or_crls(self, 1));
+    return ossl_x509_sk2ary(pkcs7_get_certs(self));
 }
 
 static VALUE
@@ -621,7 +641,7 @@ ossl_pkcs7_set_crls(VALUE self, VALUE ar
     STACK_OF(X509_CRL) *crls;
     X509_CRL *crl;
 
-    crls = pkcs7_get_certs_or_crls(self, 0);
+    crls = pkcs7_get_crls(self);
     while((crl = sk_X509_CRL_pop(crls))) X509_CRL_free(crl);
     rb_iterate(rb_each, ary, ossl_pkcs7_set_crls_i, self);
 
@@ -631,7 +651,7 @@ ossl_pkcs7_set_crls(VALUE self, VALUE ar
 static VALUE
 ossl_pkcs7_get_crls(VALUE self)
 {
-    return ossl_x509crl_sk2ary(pkcs7_get_certs_or_crls(self, 0));
+    return ossl_x509crl_sk2ary(pkcs7_get_crls(self));
 }
 
 static VALUE
diff -up ext/openssl/ossl_ssl.c.ossl10 ext/openssl/ossl_ssl.c
--- ext/openssl/ossl_ssl.c.ossl10	2007-03-12 05:12:32.000000000 +0100
+++ ext/openssl/ossl_ssl.c	2009-08-26 12:08:48.000000000 +0200
@@ -89,12 +89,18 @@ static char *ossl_sslctx_attrs[] = {
 static char *ossl_ssl_attr_readers[] = { "io", "context", };
 static char *ossl_ssl_attrs[] = { "sync_close", };
 
+#if OPENSSL_VERSION_NUMBER >= 0x10000000L
+#define OSSL_MORE_CONST const
+#define STACK _STACK
+#else
+#define OSSL_MORE_CONST
+#endif
 /*
  * SSLContext class
  */
 struct {
     const char *name;
-    SSL_METHOD *(*func)(void);
+    OSSL_MORE_CONST SSL_METHOD *(*func)(void);
 } ossl_ssl_method_tab[] = {
 #define OSSL_SSL_METHOD_ENTRY(name) { #name, name##_method }
     OSSL_SSL_METHOD_ENTRY(TLSv1),
@@ -407,7 +413,7 @@ ossl_sslctx_setup(VALUE self)
 }
 
 static VALUE
-ossl_ssl_cipher_to_ary(SSL_CIPHER *cipher)
+ossl_ssl_cipher_to_ary(OSSL_MORE_CONST SSL_CIPHER *cipher)
 {
     VALUE ary;
     int bits, alg_bits;
@@ -805,7 +811,7 @@ static VALUE
 ossl_ssl_get_cipher(VALUE self)
 {
     SSL *ssl;
-    SSL_CIPHER *cipher;
+    OSSL_MORE_CONST SSL_CIPHER *cipher;
 
     Data_Get_Struct(self, SSL, ssl);
     if (!ssl) {