Rename the field 'provctx and data' to 'algctx' inside some objects containing

pointers to provider size algorithm contexts.

Fixes #14284

The gettable_ctx_params methods were confusingly passing a 'provctx' and
a provider context which are completely different objects.
Some objects such as EVP_KDF used 'data' while others such as EVP_MD used 'provctx'.

For libcrypto this 'ctx' is an opaque ptr returned when a providers algorithm
implementation creates an internal context using a new_ctx() method.
Hence the new name 'algctx'.

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15275)

1 files changed, 20 insertions, 4 deletions

diff --git a/include/crypto/evp.h b/include/crypto/evp.h
index 92a9f0fc29..ea61b83469 100644
--- a/include/crypto/evp.h
+++ b/include/crypto/evp.h
@@ -58,21 +58,37 @@ struct evp_pkey_ctx_st {
 
         struct {
             EVP_KEYEXCH *exchange;
-            void *exchprovctx;
+            /*
+             * Opaque ctx returned from a providers exchange algorithm
+             * implementation OSSL_FUNC_keyexch_newctx()
+             */
+            void *algctx;
         } kex;
 
         struct {
             EVP_SIGNATURE *signature;
-            void *sigprovctx;
+            /*
+             * Opaque ctx returned from a providers signature algorithm
+             * implementation OSSL_FUNC_signature_newctx()
+             */
+            void *algctx;
         } sig;
 
         struct {
             EVP_ASYM_CIPHER *cipher;
-            void *ciphprovctx;
+            /*
+             * Opaque ctx returned from a providers asymmetric cipher algorithm
+             * implementation OSSL_FUNC_asym_cipher_newctx()
+             */
+            void *algctx;
         } ciph;
         struct {
             EVP_KEM *kem;
-            void *kemprovctx;
+            /*
+             * Opaque ctx returned from a providers KEM algorithm
+             * implementation OSSL_FUNC_kem_newctx()
+             */
+            void *algctx;
         } encap;
     } op;