diff --git a/include/proto/openssl-compat.h b/include/proto/openssl-compat.h
new file mode 100644
index 0000000..17b491f
--- /dev/null
+++ b/include/proto/openssl-compat.h
@@ -0,0 +1,142 @@
+#ifndef _PROTO_OPENSSL_COMPAT_H
+#define _PROTO_OPENSSL_COMPAT_H
+#include <openssl/crypto.h>
+#include <openssl/ssl.h>
+#include <openssl/x509.h>
+#include <openssl/x509v3.h>
+#include <openssl/x509.h>
+#include <openssl/err.h>
+#include <openssl/rand.h>
+#if (defined SSL_CTRL_SET_TLSEXT_STATUS_REQ_CB && !defined OPENSSL_NO_OCSP)
+#include <openssl/ocsp.h>
+#endif
+#ifndef OPENSSL_NO_DH
+#include <openssl/dh.h>
+#endif
+
+#if (OPENSSL_VERSION_NUMBER < 0x1000000fL)
+/*
+ * Functions introduced in OpenSSL 1.0.1
+ */
+static inline int SSL_SESSION_set1_id_context(SSL_SESSION *s, const unsigned char *sid_ctx, unsigned int sid_ctx_len)
+{
+	s->sid_ctx_length = sid_ctx_len;
+	memcpy(s->sid_ctx, sid_ctx, sid_ctx_len);
+	return 1;
+}
+
+static inline int EVP_PKEY_base_id(const EVP_PKEY *pkey)
+{
+	return EVP_PKEY_type(pkey->type);
+}
+
+static inline const unsigned char *SSL_SESSION_get_id(const SSL_SESSION *sess, unsigned int *sid_length)
+{
+	*sid_length = sess->session_id_length;
+	return sess->session_id;
+}
+
+static inline X509_NAME_ENTRY *X509_NAME_get_entry(const X509_NAME *name, int loc)
+{
+	return sk_X509_NAME_ENTRY_value(name->entries, loc);
+}
+
+static inline ASN1_OBJECT *X509_NAME_ENTRY_get_object(const X509_NAME_ENTRY *ne)
+{
+	return ne->object;
+}
+
+static inline ASN1_STRING *X509_NAME_ENTRY_get_data(const X509_NAME_ENTRY *ne)
+{
+	return ne->value;
+}
+
+static inline int ASN1_STRING_length(const ASN1_STRING *x)
+{
+	return x->length;
+}
+
+static inline int X509_NAME_entry_count(X509_NAME *name)
+{
+	return sk_X509_NAME_ENTRY_num(name->entries)
+}
+
+int X509_PUBKEY_get0_param(ASN1_OBJECT **ppkalg, const unsigned char **pk, int *ppklen, X509_ALGOR **pa, X509_PUBKEY *pub)
+{
+	*ppkalg = pub->algor->algorithm;
+	return 1;
+}
+
+static inline void X509_ALGOR_get0(ASN1_OBJECT **paobj, int *pptype, const void **ppval, const X509_ALGOR *algor)
+{
+	*paobj = algor->algorithm;
+}
+
+#ifndef X509_get_X509_PUBKEY
+#define X509_get_X509_PUBKEY(x) ((x)->cert_info->key
+#endif
+
+#endif
+
+#if (OPENSSL_VERSION_NUMBER < 0x1010000fL)
+/*
+ * Functions introduced in OpenSSL 1.1.0
+ */
+
+static inline const unsigned char *SSL_SESSION_get0_id_context(const SSL_SESSION *sess, unsigned int *sid_ctx_length)
+{
+	*sid_ctx_length = sess->sid_ctx_length;
+	return sess->sid_ctx;
+}
+
+static inline int SSL_SESSION_set1_id(SSL_SESSION *s, const unsigned char *sid, unsigned int sid_len)
+{
+	s->session_id_length = sid_len;
+	memcpy(s->session_id, sid, sid_len);
+	return 1;
+}
+
+static inline const OCSP_CERTID *OCSP_SINGLERESP_get0_id(const OCSP_SINGLERESP *single)
+{
+	return single->certId;
+}
+
+static inline pem_password_cb *SSL_CTX_get_default_passwd_cb(SSL_CTX *ctx)
+{
+	return ctx->default_passwd_callback;
+}
+
+static inline void *SSL_CTX_get_default_passwd_cb_userdata(SSL_CTX *ctx)
+{
+	return ctx->default_passwd_callback_userdata;
+}
+
+#ifndef OPENSSL_NO_DH
+static inline int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g)
+{
+	/* Implements only the bare necessities for HAProxy */
+	dh->p = p;
+	dh->g = g;
+	return 1;
+}
+#endif
+
+static inline const unsigned char *ASN1_STRING_get0_data(const ASN1_STRING *x)
+{
+	return x->data;
+}
+
+static inline X509_ALGOR *X509_get0_tbs_sigalg(const X509 *x)
+{
+	return x->cert_info->signature;
+}
+
+#endif
+
+#if (OPENSSL_VERSION_NUMBER >= 0x1010000fL)
+#define __OPENSSL_110_CONST__ const
+#else
+#define __OPENSSL_110_CONST__
+#endif
+
+#endif /* _PROTO_OPENSSL_COMPAT_H */