Clean away unnecessary length related OSSL_PARAM key names

This cleans away old misunderstandings of what can be done with OSSL_PARAM.
Reviewed-by: NPaul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/13946)

crypto/evp/dh_ctrl.c

@@ -550,7 +550,7 @@ int EVP_PKEY_CTX_get0_dh_kdf_ukm(EVP_PKEY_CTX *ctx, unsigned char **pukm)
 {
     int ret;
     size_t ukmlen;
-    OSSL_PARAM params[3], *p = params;
+    OSSL_PARAM params[2], *p = params;
 
     ret = dh_param_derive_check(ctx);
     if (ret != 1)
@@ -563,8 +563,6 @@ int EVP_PKEY_CTX_get0_dh_kdf_ukm(EVP_PKEY_CTX *ctx, unsigned char **pukm)
 
     *p++ = OSSL_PARAM_construct_octet_ptr(OSSL_EXCHANGE_PARAM_KDF_UKM,
                                           (void **)pukm, 0);
-    *p++ = OSSL_PARAM_construct_size_t(OSSL_EXCHANGE_PARAM_KDF_UKM_LEN,
-                                       &ukmlen);
     *p = OSSL_PARAM_construct_end();
 
     ret = evp_pkey_ctx_get_params_strict(ctx, params);
@@ -576,6 +574,7 @@ int EVP_PKEY_CTX_get0_dh_kdf_ukm(EVP_PKEY_CTX *ctx, unsigned char **pukm)
         return -1;
     }
 
+    ukmlen = params[0].return_size;
     if (ukmlen > INT_MAX)
         return -1;
 

crypto/evp/ec_ctrl.c

@@ -387,7 +387,7 @@ int EVP_PKEY_CTX_get0_ecdh_kdf_ukm(EVP_PKEY_CTX *ctx, unsigned char **pukm)
 {
     size_t ukmlen;
     int ret;
-    OSSL_PARAM params[3], *p = params;
+    OSSL_PARAM params[2], *p = params;
 
     ret = evp_pkey_ctx_getset_ecdh_param_checks(ctx);
     if (ret != 1)
@@ -402,8 +402,6 @@ int EVP_PKEY_CTX_get0_ecdh_kdf_ukm(EVP_PKEY_CTX *ctx, unsigned char **pukm)
 
     *p++ = OSSL_PARAM_construct_octet_ptr(OSSL_EXCHANGE_PARAM_KDF_UKM,
                                           (void **)pukm, 0);
-    *p++ = OSSL_PARAM_construct_size_t(OSSL_EXCHANGE_PARAM_KDF_UKM_LEN,
-                                       &ukmlen);
     *p++ = OSSL_PARAM_construct_end();
 
     ret = evp_pkey_ctx_get_params_strict(ctx, params);
@@ -415,6 +413,7 @@ int EVP_PKEY_CTX_get0_ecdh_kdf_ukm(EVP_PKEY_CTX *ctx, unsigned char **pukm)
         return -1;
     }
 
+    ukmlen = params[0].return_size;
     if (ukmlen > INT_MAX)
         return -1;
 

crypto/rsa/rsa_lib.c

@@ -1207,7 +1207,7 @@ int EVP_PKEY_CTX_set0_rsa_oaep_label(EVP_PKEY_CTX *ctx, void *label, int llen)
 
 int EVP_PKEY_CTX_get0_rsa_oaep_label(EVP_PKEY_CTX *ctx, unsigned char **label)
 {
-    OSSL_PARAM rsa_params[3], *p = rsa_params;
+    OSSL_PARAM rsa_params[2], *p = rsa_params;
     size_t labellen;
 
     if (ctx == NULL || !EVP_PKEY_CTX_IS_ASYM_CIPHER_OP(ctx)) {
@@ -1228,13 +1228,12 @@ int EVP_PKEY_CTX_get0_rsa_oaep_label(EVP_PKEY_CTX *ctx, unsigned char **label)
 
     *p++ = OSSL_PARAM_construct_octet_ptr(OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL,
                                           (void **)label, 0);
-    *p++ = OSSL_PARAM_construct_size_t(OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL_LEN,
-                                       &labellen);
     *p++ = OSSL_PARAM_construct_end();
 
     if (!EVP_PKEY_CTX_get_params(ctx, rsa_params))
         return -1;
 
+    labellen = rsa_params[0].return_size;
     if (labellen > INT_MAX)
         return -1;
 

doc/man7/EVP_KEYEXCH-ECDH.pod

@@ -62,11 +62,6 @@ Function associated with the given key exchange ctx.
 Gets a pointer to the User Key Material to be used as part of the selected
 Key Derivation Function associated with the given key exchange ctx.
 
-=item "kdf-ukm-len" (B<OSSL_EXCHANGE_PARAM_KDF_UKM_LEN>) <size_t>
-
-Gets the size of the User Key Material to be used as part of the selected
-Key Derivation Function associated with the given key exchange ctx.
-
 =back
 
 =head1 EXAMPLES

doc/man7/provider-asym_cipher.pod

@@ -219,10 +219,6 @@ Gets or sets the properties to use when fetching the MGF1 digest algorithm.
 
 Gets or sets the OAEP label used when OAEP padding is in use.
 
-=item "oaep-label-len" (B<OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL_LEN>) <size_t>
-
-Gets the length of an OAEP label when OAEP padding is in use.
-
 =item "tls-client-version" (B<OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION>) <unsigned integer>
 
 The TLS protocol version first requested by the client. See

include/openssl/core_names.h

@@ -438,7 +438,6 @@ extern "C" {
  * EVP_PKEY_CTX_{set0,get0}_rsa_oaep_label().
  */
 #define OSSL_EXCHANGE_PARAM_KDF_UKM               "kdf-ukm" /* see note above */
-#define OSSL_EXCHANGE_PARAM_KDF_UKM_LEN           "kdf-ukm-len" /* size_t */
 
 /* Signature parameters */
 #define OSSL_SIGNATURE_PARAM_ALGORITHM_ID       "algorithm-id"
@@ -463,7 +462,6 @@ extern "C" {
 #define OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST              OSSL_ALG_PARAM_DIGEST
 #define OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST_PROPS        "digest-props"
 #define OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL               "oaep-label"
-#define OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL_LEN           "oaep-label-len"
 #define OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION       "tls-client-version"
 #define OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION   "tls-negotiated-version"
 

providers/implementations/asymciphers/rsa_enc.c

@@ -382,11 +382,9 @@ static int rsa_get_ctx_params(void *vprsactx, OSSL_PARAM *params)
     }
 
     p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL);
-    if (p != NULL && !OSSL_PARAM_set_octet_ptr(p, prsactx->oaep_label, 0))
-        return 0;
-
-    p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL_LEN);
-    if (p != NULL && !OSSL_PARAM_set_size_t(p, prsactx->oaep_labellen))
+    if (p != NULL &&
+        !OSSL_PARAM_set_octet_ptr(p, prsactx->oaep_label,
+                                  prsactx->oaep_labellen))
         return 0;
 
     p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION);
@@ -406,7 +404,6 @@ static const OSSL_PARAM known_gettable_ctx_params[] = {
     OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST, NULL, 0),
     OSSL_PARAM_DEFN(OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL, OSSL_PARAM_OCTET_PTR,
                     NULL, 0),
-    OSSL_PARAM_size_t(OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL_LEN, NULL),
     OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION, NULL),
     OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION, NULL),
     OSSL_PARAM_END

providers/implementations/exchange/dh_exch.c

@@ -395,7 +395,6 @@ static const OSSL_PARAM known_gettable_ctx_params[] = {
     OSSL_PARAM_size_t(OSSL_EXCHANGE_PARAM_KDF_OUTLEN, NULL),
     OSSL_PARAM_DEFN(OSSL_EXCHANGE_PARAM_KDF_UKM, OSSL_PARAM_OCTET_PTR,
                     NULL, 0),
-    OSSL_PARAM_size_t(OSSL_EXCHANGE_PARAM_KDF_UKM_LEN, NULL),
     OSSL_PARAM_END
 };
 
@@ -444,11 +443,8 @@ static int dh_get_ctx_params(void *vpdhctx, OSSL_PARAM params[])
         return 0;
 
     p = OSSL_PARAM_locate(params, OSSL_EXCHANGE_PARAM_KDF_UKM);
-    if (p != NULL && !OSSL_PARAM_set_octet_ptr(p, pdhctx->kdf_ukm, 0))
-        return 0;
-
-    p = OSSL_PARAM_locate(params, OSSL_EXCHANGE_PARAM_KDF_UKM_LEN);
-    if (p != NULL && !OSSL_PARAM_set_size_t(p, pdhctx->kdf_ukmlen))
+    if (p != NULL
+        && !OSSL_PARAM_set_octet_ptr(p, pdhctx->kdf_ukm, pdhctx->kdf_ukmlen))
         return 0;
 
     p = OSSL_PARAM_locate(params, OSSL_KDF_PARAM_CEK_ALG);

providers/implementations/exchange/ecdh_exch.c

@@ -356,11 +356,8 @@ int ecdh_get_ctx_params(void *vpecdhctx, OSSL_PARAM params[])
         return 0;
 
     p = OSSL_PARAM_locate(params, OSSL_EXCHANGE_PARAM_KDF_UKM);
-    if (p != NULL && !OSSL_PARAM_set_octet_ptr(p, pectx->kdf_ukm, 0))
-        return 0;
-
-    p = OSSL_PARAM_locate(params, OSSL_EXCHANGE_PARAM_KDF_UKM_LEN);
-    if (p != NULL && !OSSL_PARAM_set_size_t(p, pectx->kdf_ukmlen))
+    if (p != NULL &&
+        !OSSL_PARAM_set_octet_ptr(p, pectx->kdf_ukm, pectx->kdf_ukmlen))
         return 0;
 
     return 1;
@@ -373,7 +370,6 @@ static const OSSL_PARAM known_gettable_ctx_params[] = {
     OSSL_PARAM_size_t(OSSL_EXCHANGE_PARAM_KDF_OUTLEN, NULL),
     OSSL_PARAM_DEFN(OSSL_EXCHANGE_PARAM_KDF_UKM, OSSL_PARAM_OCTET_PTR,
                     NULL, 0),
-    OSSL_PARAM_size_t(OSSL_EXCHANGE_PARAM_KDF_UKM_LEN, NULL),
     OSSL_PARAM_END
 };