Add ENGINE support for EVP_PKEY_METHOD including lookups of ENGINE

implementations and functional reference counting when a context
is allocated, free or copied.

CHANGES

@@ -5,7 +5,8 @@
  Changes between 0.9.8b and 0.9.9  [xx XXX xxxx]
 
   *) Initial engine support for EVP_PKEY_METHOD. New functions to permit
-     an engine to register a method. 
+     an engine to register a method. Add ENGINE lookups for methods and
+     functional reference processing.
      [Steve Henson]
 
   *) New functions EVP_Digest{Sign,Verify)*. These are enchance versions of

crypto/engine/engine.h

@@ -552,6 +552,7 @@ ENGINE *ENGINE_get_default_RAND(void);
  * ciphering or digesting corresponding to "nid". */
 ENGINE *ENGINE_get_cipher_engine(int nid);
 ENGINE *ENGINE_get_digest_engine(int nid);
+ENGINE *ENGINE_get_pkey_meth_engine(int nid);
 
 /* This sets a new default ENGINE structure for performing RSA
  * operations. If the result is non-zero (success) then the ENGINE

crypto/evp/evp.h

@@ -954,7 +954,7 @@ void EVP_PKEY_asn1_set_ctrl(EVP_PKEY_ASN1_METHOD *ameth,
 
 #define EVP_PKEY_FLAG_AUTOARGLEN	2
 
-const EVP_PKEY_METHOD *EVP_PKEY_meth_find(int type, ENGINE *e);
+const EVP_PKEY_METHOD *EVP_PKEY_meth_find(int type);
 EVP_PKEY_METHOD* EVP_PKEY_meth_new(int id, int flags);
 void EVP_PKEY_meth_free(EVP_PKEY_METHOD *pmeth);
 int EVP_PKEY_meth_add0(const EVP_PKEY_METHOD *pmeth);
@@ -1109,6 +1109,7 @@ void ERR_load_EVP_strings(void);
 #define EVP_F_EVP_PKEY_COPY_PARAMETERS			 103
 #define EVP_F_EVP_PKEY_CTX_CTRL				 137
 #define EVP_F_EVP_PKEY_CTX_CTRL_STR			 150
+#define EVP_F_EVP_PKEY_CTX_DUP				 156
 #define EVP_F_EVP_PKEY_DECRYPT				 104
 #define EVP_F_EVP_PKEY_DECRYPT_INIT			 138
 #define EVP_F_EVP_PKEY_DECRYPT_OLD			 151
@@ -1137,6 +1138,7 @@ void ERR_load_EVP_strings(void);
 #define EVP_F_EVP_RIJNDAEL				 126
 #define EVP_F_EVP_SIGNFINAL				 107
 #define EVP_F_EVP_VERIFYFINAL				 108
+#define EVP_F_INT_CTX_NEW				 157
 #define EVP_F_PKCS5_PBE_KEYIVGEN			 117
 #define EVP_F_PKCS5_V2_PBE_KEYIVGEN			 118
 #define EVP_F_PKCS8_SET_BROKEN				 112

crypto/evp/evp_err.c

@@ -92,6 +92,7 @@ static ERR_STRING_DATA EVP_str_functs[]=
 {ERR_FUNC(EVP_F_EVP_PKEY_COPY_PARAMETERS),	"EVP_PKEY_copy_parameters"},
 {ERR_FUNC(EVP_F_EVP_PKEY_CTX_CTRL),	"EVP_PKEY_CTX_ctrl"},
 {ERR_FUNC(EVP_F_EVP_PKEY_CTX_CTRL_STR),	"EVP_PKEY_CTX_ctrl_str"},
+{ERR_FUNC(EVP_F_EVP_PKEY_CTX_DUP),	"EVP_PKEY_CTX_dup"},
 {ERR_FUNC(EVP_F_EVP_PKEY_DECRYPT),	"EVP_PKEY_decrypt"},
 {ERR_FUNC(EVP_F_EVP_PKEY_DECRYPT_INIT),	"EVP_PKEY_decrypt_init"},
 {ERR_FUNC(EVP_F_EVP_PKEY_DECRYPT_OLD),	"EVP_PKEY_decrypt_old"},
@@ -120,6 +121,7 @@ static ERR_STRING_DATA EVP_str_functs[]=
 {ERR_FUNC(EVP_F_EVP_RIJNDAEL),	"EVP_RIJNDAEL"},
 {ERR_FUNC(EVP_F_EVP_SIGNFINAL),	"EVP_SignFinal"},
 {ERR_FUNC(EVP_F_EVP_VERIFYFINAL),	"EVP_VerifyFinal"},
+{ERR_FUNC(EVP_F_INT_CTX_NEW),	"INT_CTX_NEW"},
 {ERR_FUNC(EVP_F_PKCS5_PBE_KEYIVGEN),	"PKCS5_PBE_keyivgen"},
 {ERR_FUNC(EVP_F_PKCS5_V2_PBE_KEYIVGEN),	"PKCS5_v2_PBE_keyivgen"},
 {ERR_FUNC(EVP_F_PKCS8_SET_BROKEN),	"PKCS8_set_broken"},

crypto/evp/evp_locl.h

@@ -239,6 +239,8 @@ struct evp_pkey_ctx_st
 	{
 	/* Method associated with this operation */
 	const EVP_PKEY_METHOD *pmeth;
+	/* Engine that implements this method or NULL if builtin */
+	ENGINE *engine;
 	/* Key: may be NULL */
 	EVP_PKEY *pkey;
 	/* Peer key for key agreement, may be NULL */

crypto/evp/pmeth_lib.c

@@ -61,6 +61,9 @@
 #include "cryptlib.h"
 #include <openssl/objects.h>
 #include <openssl/evp.h>
+#ifndef OPENSSL_NO_ENGINE
+#include <openssl/engine.h>
+#endif
 #include "asn1_locl.h"
 #include "evp_locl.h"
 
@@ -83,7 +86,7 @@ static int pmeth_cmp(const EVP_PKEY_METHOD * const *a,
         return ((*a)->pkey_id - (*b)->pkey_id);
 	}
 
-const EVP_PKEY_METHOD *EVP_PKEY_meth_find(int type, ENGINE *e)
+const EVP_PKEY_METHOD *EVP_PKEY_meth_find(int type)
 	{
 	EVP_PKEY_METHOD tmp, *t = &tmp, **ret;
 	tmp.pkey_id = type;
@@ -115,10 +118,32 @@ static EVP_PKEY_CTX *int_ctx_new(EVP_PKEY *pkey, ENGINE *e, int id)
 			return NULL;
 		id = pkey->ameth->pkey_id;
 		}
-	pmeth = EVP_PKEY_meth_find(id, e);
+	/* Try to find an ENGINE which implements this method */
+	if (e)
+		{
+		if (!ENGINE_init(e))
+			{
+			EVPerr(EVP_F_INT_CTX_NEW,ERR_R_ENGINE_LIB);
+			return NULL;
+			}
+		else
+			e = ENGINE_get_pkey_meth_engine(id);
+		}
+
+	/* If an ENGINE handled this method look it up. Othewise
+	 * use internal table.S
+	 */
+
+	if (e)
+		pmeth = ENGINE_get_pkey_meth(e, id);
+	else
+		pmeth = EVP_PKEY_meth_find(id);
+
 	if (pmeth == NULL)
 		return NULL;
+
 	ret = OPENSSL_malloc(sizeof(EVP_PKEY_CTX));
+	ret->engine = e;
 	ret->pmeth = pmeth;
 	ret->operation = EVP_PKEY_OP_UNDEFINED;
 	ret->pkey = pkey;
@@ -199,11 +224,22 @@ EVP_PKEY_CTX *EVP_PKEY_CTX_dup(EVP_PKEY_CTX *pctx)
 	EVP_PKEY_CTX *rctx;
 	if (!pctx->pmeth || !pctx->pmeth->copy)
 		return NULL;
+#ifndef OPENSSL_NO_ENGINE
+	/* Make sure it's safe to copy a pkey context using an ENGINE */
+	if (pctx->engine && !ENGINE_init(pctx->engine))
+		{
+		EVPerr(EVP_F_EVP_PKEY_CTX_DUP,ERR_R_ENGINE_LIB);
+		return 0;
+		}
+#endif
 	rctx = OPENSSL_malloc(sizeof(EVP_PKEY_CTX));
 	if (!rctx)
 		return NULL;
 
 	rctx->pmeth = pctx->pmeth;
+#ifndef OPENSSL_NO_ENGINE
+	rctx->engine = pctx->engine;
+#endif
 
 	if (pctx->pkey)
 		{
@@ -251,6 +287,12 @@ void EVP_PKEY_CTX_free(EVP_PKEY_CTX *ctx)
 		EVP_PKEY_free(ctx->pkey);
 	if (ctx->peerkey)
 		EVP_PKEY_free(ctx->peerkey);
+#ifndef OPENSSL_NO_ENGINE
+	if(ctx->engine)
+		/* The EVP_PKEY_CTX we used belongs to an ENGINE, release the
+		 * functional reference we held for this reason. */
+		ENGINE_finish(ctx->engine);
+#endif
 	OPENSSL_free(ctx);
 	}