Remove support for HMAC_TEST_PRIVATE_KEY_FORMAT

This is a bogus, undocumented format that was intended for testing; I
don't think anyone is using it.
Reviewed-by: NRichard Levitte <levitte@openssl.org>

crypto/hmac/hm_ameth.c

@@ -12,8 +12,6 @@
 #include <openssl/evp.h>
 #include "internal/asn1_int.h"
 
-#define HMAC_TEST_PRIVATE_KEY_FORMAT
-
 /*
  * HMAC "ASN1" method. This is just here to indicate the maximum HMAC output
  * length and to free up an HMAC key.
@@ -51,53 +49,6 @@ static int hmac_pkey_public_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
     return ASN1_OCTET_STRING_cmp(EVP_PKEY_get0(a), EVP_PKEY_get0(b));
 }
 
-#ifdef HMAC_TEST_PRIVATE_KEY_FORMAT
-/*
- * A bogus private key format for test purposes. This is simply the HMAC key
- * with "HMAC PRIVATE KEY" in the headers. When enabled the genpkey utility
- * can be used to "generate" HMAC keys.
- */
-
-static int old_hmac_decode(EVP_PKEY *pkey,
-                           const unsigned char **pder, int derlen)
-{
-    ASN1_OCTET_STRING *os;
-    os = ASN1_OCTET_STRING_new();
-    if (os == NULL || !ASN1_OCTET_STRING_set(os, *pder, derlen))
-        goto err;
-    if (!EVP_PKEY_assign(pkey, EVP_PKEY_HMAC, os))
-        goto err;
-    return 1;
-
- err:
-    ASN1_OCTET_STRING_free(os);
-    return 0;
-}
-
-static int old_hmac_encode(const EVP_PKEY *pkey, unsigned char **pder)
-{
-    int inc;
-    ASN1_OCTET_STRING *os = EVP_PKEY_get0(pkey);
-    if (pder) {
-        if (!*pder) {
-            *pder = OPENSSL_malloc(os->length);
-            if (*pder == NULL)
-                return -1;
-            inc = 0;
-        } else
-            inc = 1;
-
-        memcpy(*pder, os->data, os->length);
-
-        if (inc)
-            *pder += os->length;
-    }
-
-    return os->length;
-}
-
-#endif
-
 const EVP_PKEY_ASN1_METHOD hmac_asn1_meth = {
     EVP_PKEY_HMAC,
     EVP_PKEY_HMAC,
@@ -116,10 +67,5 @@ const EVP_PKEY_ASN1_METHOD hmac_asn1_meth = {
 
     hmac_key_free,
     hmac_pkey_ctrl,
-#ifdef HMAC_TEST_PRIVATE_KEY_FORMAT
-    old_hmac_decode,
-    old_hmac_encode
-#else
     0, 0
-#endif
 };