Re-implement EVP_MD_name() and EVP_CIPHER_name() as functions

They will do the same as usual for non-provider algorithms
implementations, but can handle provider implementations as well.

Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/9356)

crypto/evp/evp_lib.c

@@ -415,6 +415,17 @@ int EVP_CIPHER_CTX_nid(const EVP_CIPHER_CTX *ctx)
     return ctx->cipher->nid;
 }
 
+const char *EVP_CIPHER_name(const EVP_CIPHER *cipher)
+{
+    if (cipher->prov != NULL)
+        return cipher->name;
+#ifndef FIPS_MODE
+    return OBJ_nid2sn(EVP_CIPHER_nid(cipher));
+#else
+    return NULL;
+#endif
+}
+
 int EVP_CIPHER_mode(const EVP_CIPHER *cipher)
 {
     int ok, v = EVP_CIPHER_flags(cipher) & EVP_CIPH_MODE;
@@ -426,6 +437,17 @@ int EVP_CIPHER_mode(const EVP_CIPHER *cipher)
     return ok != 0 ? v : 0;
 }
 
+const char *EVP_MD_name(const EVP_MD *md)
+{
+    if (md->prov != NULL)
+        return md->name;
+#ifndef FIPS_MODE
+    return OBJ_nid2sn(EVP_MD_nid(md));
+#else
+    return NULL;
+#endif
+}
+
 int EVP_MD_block_size(const EVP_MD *md)
 {
     if (md == NULL) {

doc/man3/EVP_DigestInit.pod

@@ -8,7 +8,9 @@ EVP_MD_CTX_copy_ex, EVP_MD_CTX_ctrl, EVP_MD_CTX_set_params, EVP_MD_CTX_get_param
 EVP_MD_CTX_set_flags, EVP_MD_CTX_clear_flags, EVP_MD_CTX_test_flags,
 EVP_Digest, EVP_DigestInit_ex, EVP_DigestInit, EVP_DigestUpdate,
 EVP_DigestFinal_ex, EVP_DigestFinalXOF, EVP_DigestFinal,
+EVP_MD_name,
 EVP_MD_type, EVP_MD_pkey_type, EVP_MD_size, EVP_MD_block_size, EVP_MD_flags,
+EVP_MD_CTX_name,
 EVP_MD_CTX_md, EVP_MD_CTX_type, EVP_MD_CTX_size, EVP_MD_CTX_block_size,
 EVP_MD_CTX_md_data, EVP_MD_CTX_update_fn, EVP_MD_CTX_set_update_fn,
 EVP_md_null,
@@ -45,6 +47,7 @@ EVP_MD_CTX_pkey_ctx, EVP_MD_CTX_set_pkey_ctx - EVP digest routines
 
  int EVP_MD_CTX_copy(EVP_MD_CTX *out, EVP_MD_CTX *in);
 
+ const char *EVP_MD_name(const EVP_MD *md);
  int EVP_MD_type(const EVP_MD *md);
  int EVP_MD_pkey_type(const EVP_MD *md);
  int EVP_MD_size(const EVP_MD *md);
@@ -52,6 +55,7 @@ EVP_MD_CTX_pkey_ctx, EVP_MD_CTX_set_pkey_ctx - EVP digest routines
  unsigned long EVP_MD_flags(const EVP_MD *md);
 
  const EVP_MD *EVP_MD_CTX_md(const EVP_MD_CTX *ctx);
+ const char *EVP_MD_CTX_name(const EVP_MD_CTX *ctx);
  int EVP_MD_CTX_size(const EVP_MD *ctx);
  int EVP_MD_CTX_block_size(const EVP_MD *ctx);
  int EVP_MD_CTX_type(const EVP_MD *ctx);
@@ -184,6 +188,11 @@ automatically cleaned up.
 Similar to EVP_MD_CTX_copy_ex() except the destination B<out> does not have to
 be initialized.
 
+=item EVP_MD_name(),
+EVP_MD_CTX_name()
+
+Return the name of the given message digest.
+
 =item EVP_MD_size(),
 EVP_MD_CTX_size()
 
@@ -433,9 +442,9 @@ implementations of digests to be specified.
 If digest contexts are not cleaned up after use,
 memory leaks will occur.
 
-EVP_MD_CTX_size(), EVP_MD_CTX_block_size(), EVP_MD_CTX_type(),
-EVP_get_digestbynid() and EVP_get_digestbyobj() are defined as
-macros.
+EVP_MD_CTX_name(), EVP_MD_CTX_size(), EVP_MD_CTX_block_size(),
+EVP_MD_CTX_type(), EVP_get_digestbynid() and EVP_get_digestbyobj() are defined
+as macros.
 
 EVP_MD_CTX_ctrl() sends commands to message digests for additional configuration
 or control.

doc/man3/EVP_EncryptInit.pod

@@ -26,6 +26,7 @@ EVP_CipherFinal,
 EVP_get_cipherbyname,
 EVP_get_cipherbynid,
 EVP_get_cipherbyobj,
+EVP_CIPHER_name,
 EVP_CIPHER_nid,
 EVP_CIPHER_block_size,
 EVP_CIPHER_key_length,
@@ -34,6 +35,7 @@ EVP_CIPHER_flags,
 EVP_CIPHER_mode,
 EVP_CIPHER_type,
 EVP_CIPHER_CTX_cipher,
+EVP_CIPHER_CTX_name,
 EVP_CIPHER_CTX_nid,
 EVP_CIPHER_CTX_block_size,
 EVP_CIPHER_CTX_key_length,
@@ -101,6 +103,7 @@ EVP_enc_null
  const EVP_CIPHER *EVP_get_cipherbyobj(const ASN1_OBJECT *a);
 
  int EVP_CIPHER_nid(const EVP_CIPHER *e);
+ const char *EVP_CIPHER_name(const EVP_CIPHER *cipher);
  int EVP_CIPHER_block_size(const EVP_CIPHER *e);
  int EVP_CIPHER_key_length(const EVP_CIPHER *e);
  int EVP_CIPHER_iv_length(const EVP_CIPHER *e);
@@ -110,6 +113,7 @@ EVP_enc_null
 
  const EVP_CIPHER *EVP_CIPHER_CTX_cipher(const EVP_CIPHER_CTX *ctx);
  int EVP_CIPHER_CTX_nid(const EVP_CIPHER_CTX *ctx);
+ const char *EVP_CIPHER_CTX_name(const EVP_CIPHER_CTX *ctx);
  int EVP_CIPHER_CTX_block_size(const EVP_CIPHER_CTX *ctx);
  int EVP_CIPHER_CTX_key_length(const EVP_CIPHER_CTX *ctx);
  int EVP_CIPHER_CTX_iv_length(const EVP_CIPHER_CTX *ctx);
@@ -255,6 +259,9 @@ IDENTIFIER as such it ignores the cipher parameters and 40 bit RC2 and
 identifier or does not have ASN1 support this function will return
 B<NID_undef>.
 
+EVP_CIPHER_name() and EVP_CIPHER_CTX_name() return the name of the passed
+cipher or context.
+
 EVP_CIPHER_CTX_cipher() returns the B<EVP_CIPHER> structure when passed
 an B<EVP_CIPHER_CTX> structure.
 

include/openssl/evp.h

@@ -449,7 +449,7 @@ typedef int (EVP_PBE_KEYGEN) (EVP_CIPHER_CTX *ctx, const char *pass,
 
 int EVP_MD_type(const EVP_MD *md);
 # define EVP_MD_nid(e)                   EVP_MD_type(e)
-# define EVP_MD_name(e)                  OBJ_nid2sn(EVP_MD_nid(e))
+const char *EVP_MD_name(const EVP_MD *md);
 int EVP_MD_pkey_type(const EVP_MD *md);
 int EVP_MD_size(const EVP_MD *md);
 int EVP_MD_block_size(const EVP_MD *md);
@@ -461,6 +461,7 @@ int (*EVP_MD_CTX_update_fn(EVP_MD_CTX *ctx))(EVP_MD_CTX *ctx,
 void EVP_MD_CTX_set_update_fn(EVP_MD_CTX *ctx,
                               int (*update) (EVP_MD_CTX *ctx,
                                              const void *data, size_t count));
+# define EVP_MD_CTX_name(e)              EVP_MD_name(EVP_MD_CTX_md(e))
 # define EVP_MD_CTX_size(e)              EVP_MD_size(EVP_MD_CTX_md(e))
 # define EVP_MD_CTX_block_size(e)        EVP_MD_block_size(EVP_MD_CTX_md(e))
 # define EVP_MD_CTX_type(e)              EVP_MD_type(EVP_MD_CTX_md(e))
@@ -469,7 +470,7 @@ void EVP_MD_CTX_set_pkey_ctx(EVP_MD_CTX *ctx, EVP_PKEY_CTX *pctx);
 void *EVP_MD_CTX_md_data(const EVP_MD_CTX *ctx);
 
 int EVP_CIPHER_nid(const EVP_CIPHER *cipher);
-# define EVP_CIPHER_name(e)              OBJ_nid2sn(EVP_CIPHER_nid(e))
+const char *EVP_CIPHER_name(const EVP_CIPHER *cipher);
 int EVP_CIPHER_block_size(const EVP_CIPHER *cipher);
 int EVP_CIPHER_impl_ctx_size(const EVP_CIPHER *cipher);
 int EVP_CIPHER_key_length(const EVP_CIPHER *cipher);
@@ -496,6 +497,7 @@ void *EVP_CIPHER_CTX_get_app_data(const EVP_CIPHER_CTX *ctx);
 void EVP_CIPHER_CTX_set_app_data(EVP_CIPHER_CTX *ctx, void *data);
 void *EVP_CIPHER_CTX_get_cipher_data(const EVP_CIPHER_CTX *ctx);
 void *EVP_CIPHER_CTX_set_cipher_data(EVP_CIPHER_CTX *ctx, void *cipher_data);
+# define EVP_CIPHER_CTX_name(c)         EVP_CIPHER_name(EVP_CIPHER_CTX_cipher(c))
 # define EVP_CIPHER_CTX_type(c)         EVP_CIPHER_type(EVP_CIPHER_CTX_cipher(c))
 # if !OPENSSL_API_1_1_0
 #  define EVP_CIPHER_CTX_flags(c)       EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(c))

util/libcrypto.num

@@ -4691,3 +4691,5 @@ EVP_KEYMGMT_free                        4796	3_0_0	EXIST::FUNCTION:
 EVP_KEYMGMT_provider                    4797	3_0_0	EXIST::FUNCTION:
 X509_PUBKEY_dup                         4798	3_0_0	EXIST::FUNCTION:
 ERR_put_func_error                      4799	3_0_0	EXIST::FUNCTION:
+EVP_MD_name                             4800	3_0_0	EXIST::FUNCTION:
+EVP_CIPHER_name                         4801	3_0_0	EXIST::FUNCTION:

util/private.num

@@ -201,6 +201,7 @@ EVP_DigestVerifyUpdate                  define
 EVP_KDF_name                            define
 EVP_MAC_name                            define
 EVP_MD_CTX_block_size                   define
+EVP_MD_CTX_name                         define
 EVP_MD_CTX_size                         define
 EVP_MD_CTX_type                         define
 EVP_OpenUpdate                          define