This changes EVP's cipher and digest code to hook via the ENGINE support.

See crypto/engine/README for details.

- it also removes openbsd_hw.c from the build (that functionality is
  going to be available in the openbsd ENGINE in a upcoming commit)

- evp_test has had the extra initialisation added so it will use (if
  possible) any ENGINEs supporting the algorithms required.

crypto/evp/evp_err.c

@@ -71,6 +71,7 @@ static ERR_STRING_DATA EVP_str_functs[]=
 {ERR_PACK(0,EVP_F_EVP_CIPHER_CTX_CTRL,0),	"EVP_CIPHER_CTX_ctrl"},
 {ERR_PACK(0,EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH,0),	"EVP_CIPHER_CTX_set_key_length"},
 {ERR_PACK(0,EVP_F_EVP_DECRYPTFINAL,0),	"EVP_DecryptFinal"},
+{ERR_PACK(0,EVP_F_EVP_DIGESTINIT,0),	"EVP_DigestInit"},
 {ERR_PACK(0,EVP_F_EVP_ENCRYPTFINAL,0),	"EVP_EncryptFinal"},
 {ERR_PACK(0,EVP_F_EVP_MD_CTX_COPY,0),	"EVP_MD_CTX_copy"},
 {ERR_PACK(0,EVP_F_EVP_OPENINIT,0),	"EVP_OpenInit"},
@@ -121,6 +122,7 @@ static ERR_STRING_DATA EVP_str_reasons[]=
 {EVP_R_KEYGEN_FAILURE                    ,"keygen failure"},
 {EVP_R_MISSING_PARAMETERS                ,"missing parameters"},
 {EVP_R_NO_CIPHER_SET                     ,"no cipher set"},
+{EVP_R_NO_DIGEST_SET                     ,"no digest set"},
 {EVP_R_NO_DSA_PARAMETERS                 ,"no dsa parameters"},
 {EVP_R_NO_SIGN_FUNCTION_CONFIGURED       ,"no sign function configured"},
 {EVP_R_NO_VERIFY_FUNCTION_CONFIGURED     ,"no verify function configured"},