This patch backports changes from ruby 1.8.7 which only includes the
openssl prototypes for functions that are not in the system openssl
library.

diff -u ruby-1.8.5.orig/ext/openssl/extconf.rb ruby-1.8.5/ext/openssl/extconf.rb
--- ruby-1.8.5.orig/ext/openssl/openssl_missing.c	2007-02-13 00:01:19.000000000 +0100
+++ ruby-1.8.5/ext/openssl/openssl_missing.c	2008-05-19 05:00:52.000000000 +0200
@@ -22,17 +22,15 @@
 #include "openssl_missing.h"
 
 #if !defined(HAVE_HMAC_CTX_COPY)
-int
+void
 HMAC_CTX_copy(HMAC_CTX *out, HMAC_CTX *in)
 {
-    if (!out || !in) return 0;
+    if (!out || !in) return;
     memcpy(out, in, sizeof(HMAC_CTX));
 
-    if (!EVP_MD_CTX_copy(&out->md_ctx, &in->md_ctx)
-	    || !EVP_MD_CTX_copy(&out->i_ctx, &in->i_ctx)
-	    || !EVP_MD_CTX_copy(&out->o_ctx, &in->o_ctx))
-	return 0;
-    return 1;
+    EVP_MD_CTX_copy(&out->md_ctx, &in->md_ctx);
+    EVP_MD_CTX_copy(&out->i_ctx, &in->i_ctx);
+    EVP_MD_CTX_copy(&out->o_ctx, &in->o_ctx);
 }
 #endif /* HAVE_HMAC_CTX_COPY */
 #endif /* NO_HMAC */
diff -u ruby-1.8.5.orig/ext/openssl/openssl_missing.h ruby-1.8.5/ext/openssl/openssl_missing.h
--- ruby-1.8.5.orig/ext/openssl/openssl_missing.h	2008-08-04 06:43:34.000000000 +0200
+++ ruby-1.8.5/ext/openssl/openssl_missing.h	2008-08-04 06:44:17.000000000 +0200
@@ -60,14 +60,33 @@
 	(char *(*)())d2i_PKCS7_RECIP_INFO, (char *)ri)
 #endif
 
+#if !defined(HAVE_EVP_MD_CTX_INIT)
 void HMAC_CTX_init(HMAC_CTX *ctx);
-int HMAC_CTX_copy(HMAC_CTX *out, HMAC_CTX *in);
+#endif
+
+#if !defined(HAVE_HMAC_CTX_COPY)
+void HMAC_CTX_copy(HMAC_CTX *out, HMAC_CTX *in);
+#endif
+
+#if !defined(HAVE_HMAC_CTX_CLEANUP)
 void HMAC_CTX_cleanup(HMAC_CTX *ctx);
+#endif
 
+#if !defined(HAVE_EVP_MD_CTX_CREATE)
 EVP_MD_CTX *EVP_MD_CTX_create(void);
+#endif
+
+#if !defined(HAVE_EVP_MD_CTX_INIT)
 void EVP_MD_CTX_init(EVP_MD_CTX *ctx);
+#endif
+
+#if !defined(HAVE_EVP_MD_CTX_CLEANUP)
 int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx);
+#endif
+
+#if !defined(HAVE_EVP_MD_CTX_DESTROY)
 void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx);
+#endif
 
 #if !defined(HAVE_EVP_CIPHER_CTX_COPY)
 int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, EVP_CIPHER_CTX *in);
@@ -111,19 +130,54 @@
 #define OPENSSL_cleanse(p, l) memset(p, 0, l)
 #endif
 
+#if !defined(HAVE_X509_STORE_SET_EX_DATA)
 void *X509_STORE_get_ex_data(X509_STORE *str, int idx);
 int X509_STORE_set_ex_data(X509_STORE *str, int idx, void *data);
+#endif
+
+#if !defined(HAVE_X509_CRL_SET_VERSION)
 int X509_CRL_set_version(X509_CRL *x, long version);
+#endif
+
+#if !defined(HAVE_X509_CRL_SET_ISSUER_NAME)
 int X509_CRL_set_issuer_name(X509_CRL *x, X509_NAME *name);
+#endif
+
+#if !defined(HAVE_X509_CRL_SORT)
 int X509_CRL_sort(X509_CRL *c);
+#endif
+
+#if !defined(HAVE_X509_CRL_ADD0_REVOKED)
 int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev);
+#endif
+
+#if !defined(HAVE_BN_MOD_SQR)
 int BN_mod_sqr(BIGNUM *r, const BIGNUM *a, const BIGNUM *m, BN_CTX *ctx);
+#endif
+
+#if !defined(HAVE_BN_MOD_ADD)
 int BN_mod_add(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, const BIGNUM *m, BN_CTX *ctx);
+#endif
+
+#if !defined(HAVE_BN_MOD_SUB)
 int BN_mod_sub(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, const BIGNUM *m, BN_CTX *ctx);
+#endif
+
+#if !defined(HAVE_BN_RAND_RANGE)
 int BN_rand_range(BIGNUM *r, BIGNUM *range);
+#endif
+
+#if !defined(HAVE_BN_PSEUDO_RAND_RANGE)
 int BN_pseudo_rand_range(BIGNUM *r, BIGNUM *range);
+#endif
+
+#if !defined(HAVE_CONF_GET1_DEFAULT_CONFIG_FILE)
 char *CONF_get1_default_config_file(void);
+#endif
+
+#if !defined(HAVE_PEM_DEF_CALLBACK)
 int PEM_def_callback(char *buf, int num, int w, void *key);
+#endif
 
 #if defined(__cplusplus)
 }
diff -u ruby-1.8.5.orig/ext/openssl/ossl_hmac.c ruby-1.8.5/ext/openssl/ossl_hmac.c
--- ruby-1.8.5.orig/ext/openssl/ossl_hmac.c	2007-03-12 05:12:32.000000000 +0100
+++ ruby-1.8.5/ext/openssl/ossl_hmac.c	2008-05-19 05:00:52.000000000 +0200
@@ -81,12 +87,15 @@
     GetHMAC(self, ctx1);
     SafeGetHMAC(other, ctx2);
 
-    if (!HMAC_CTX_copy(ctx1, ctx2)) {
-	ossl_raise(eHMACError, NULL);
-    }
+    HMAC_CTX_copy(ctx1, ctx2);
     return self;
 }
 
+/*
+ *  call-seq:
+ *     hmac.update(string) -> self
+ *
+ */
 static VALUE
 ossl_hmac_update(VALUE self, VALUE data)
 {
@@ -104,9 +113,7 @@
 {
     HMAC_CTX final;
 
-    if (!HMAC_CTX_copy(&final, ctx)) {
-	ossl_raise(eHMACError, NULL);
-    }
+    HMAC_CTX_copy(&final, ctx);
     if (!(*buf = OPENSSL_malloc(HMAC_size(&final)))) {
 	HMAC_CTX_cleanup(&final);
 	OSSL_Debug("Allocating %d mem", HMAC_size(&final));