text: /*
   * Copyright 2006-2021 The OpenSSL Project Authors. All Rights Reserved.
   *
   * Licensed under the Apache License 2.0 (the "License").  You may not use
   * this file except in compliance with the License.  You can obtain a copy
   * in the file LICENSE in the source distribution or at
   * https://www.openssl.org/source/license.html
   */
  
  /*
   * ECDSA low level APIs are deprecated for public use, but still ok for
   * internal use.
   */
  #include "internal/deprecated.h"
  
  #include <stdio.h>
  #include <openssl/x509.h>
  #include <openssl/ec.h>
  #include <openssl/rand.h>
  #include <openssl/core_names.h>
  #include <openssl/param_build.h>
  #include "internal/cryptlib.h"
  #include "internal/provider.h"
  #include "crypto/asn1.h"
  #include "crypto/evp.h"
  #include "crypto/ecx.h"
  #include "ec_local.h"
  #include "curve448/curve448_local.h"
  #include "ecx_backend.h"
  
  typedef enum {
      KEY_OP_PUBLIC,
      KEY_OP_PRIVATE,
      KEY_OP_KEYGEN
  } ecx_key_op_t;
  
  /* Setup EVP_PKEY using public, private or generation */
  static int ecx_key_op(EVP_PKEY *pkey, int id, const X509_ALGOR *palg,
                        const unsigned char *p, int plen, ecx_key_op_t op,
                        OSSL_LIB_CTX *libctx, const char *propq)
  {
      ECX_KEY *key = NULL;
      unsigned char *privkey, *pubkey;
  
      if (op != KEY_OP_KEYGEN) {
          if (palg != NULL) {
              int ptype;
  
              /* Algorithm parameters must be absent */
              X509_ALGOR_get0(NULL, &ptype, NULL, palg);
              if (ptype != V_ASN1_UNDEF) {
                  ERR_raise(ERR_LIB_EC, EC_R_INVALID_ENCODING);
                  return 0;
              }
          }
  
          if (p == NULL || plen != KEYLENID(id)) {
              ERR_raise(ERR_LIB_EC, EC_R_INVALID_ENCODING);
              return 0;
          }
      }
  
      key = ossl_ecx_key_new(libctx, KEYNID2TYPE(id), 1, propq);
      if (key == NULL) {
          ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
          return 0;
      }
      pubkey = key->pubkey;
  
      if (op == KEY_OP_PUBLIC) {
          memcpy(pubkey, p, plen);
      } else {
          privkey = ossl_ecx_key_allocate_privkey(key);
          if (privkey == NULL) {
              ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
              goto err;
          }
          if (op == KEY_OP_KEYGEN) {
              if (RAND_priv_bytes_ex(libctx, privkey, KEYLENID(id)) <= 0)
                  goto err;
              if (id == EVP_PKEY_X25519) {
                  privkey[0] &= 248;
                  privkey[X25519_KEYLEN - 1] &= 127;
                  privkey[X25519_KEYLEN - 1] |= 64;
              } else if (id == EVP_PKEY_X448) {
                  privkey[0] &= 252;
                  privkey[X448_KEYLEN - 1] |= 128;
              }
          } else {
              memcpy(privkey, p, KEYLENID(id));
          }
          if (!ossl_ecx_public_from_private(key)) {
              ERR_raise(ERR_LIB_EC, EC_R_FAILED_MAKING_PUBLIC_KEY);
              goto err;
          }
      }
  
      EVP_PKEY_assign(pkey, id, key);
      return 1;
   err:
      ossl_ecx_key_free(key);
      return 0;
  }
  
  static int ecx_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
  {
      const ECX_KEY *ecxkey = pkey->pkey.ecx;
      unsigned char *penc;
  
      if (ecxkey == NULL) {
          ERR_raise(ERR_LIB_EC, EC_R_INVALID_KEY);
          return 0;
      }
  
      penc = OPENSSL_memdup(ecxkey->pubkey, KEYLEN(pkey));
      if (penc == NULL) {
          ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
          return 0;
      }
  
      if (!X509_PUBKEY_set0_param(pk, OBJ_nid2obj(pkey->ameth->pkey_id),
                                  V_ASN1_UNDEF, NULL, penc, KEYLEN(pkey))) {
          OPENSSL_free(penc);
          ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
          return 0;
      }
      return 1;
  }
  
  static int ecx_pub_decode(EVP_PKEY *pkey, const X509_PUBKEY *pubkey)
  {
      const unsigned char *p;
      int pklen;
      X509_ALGOR *palg;
  
      if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
          return 0;
      return ecx_key_op(pkey, pkey->ameth->pkey_id, palg, p, pklen,
                        KEY_OP_PUBLIC, NULL, NULL);
  }
  
  static int ecx_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
  {
      const ECX_KEY *akey = a->pkey.ecx;
      const ECX_KEY *bkey = b->pkey.ecx;
  
      if (akey == NULL || bkey == NULL)
          return -2;
  
      return CRYPTO_memcmp(akey->pubkey, bkey->pubkey, KEYLEN(a)) == 0;
  }
  
  static int ecx_priv_decode_ex(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8,
                                OSSL_LIB_CTX *libctx, const char *propq)
  {
      const unsigned char *p;
      int plen;
      ASN1_OCTET_STRING *oct = NULL;
      const X509_ALGOR *palg;
      int rv;
  
      if (!PKCS8_pkey_get0(NULL, &p, &plen, &palg, p8))
          return 0;
  
      oct = d2i_ASN1_OCTET_STRING(NULL, &p, plen);
      if (oct == NULL) {
          p = NULL;
          plen = 0;
      } else {
          p = ASN1_STRING_get0_data(oct);
          plen = ASN1_STRING_length(oct);
      }
  
      rv = ecx_key_op(pkey, pkey->ameth->pkey_id, palg, p, plen, KEY_OP_PRIVATE,
                      libctx, propq);
      ASN1_STRING_clear_free(oct);
      return rv;
  }
  
  static int ecx_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
  {
      const ECX_KEY *ecxkey = pkey->pkey.ecx;
      ASN1_OCTET_STRING oct;
      unsigned char *penc = NULL;
      int penclen;
  
      if (ecxkey == NULL || ecxkey->privkey == NULL) {
          ERR_raise(ERR_LIB_EC, EC_R_INVALID_PRIVATE_KEY);
          return 0;
      }
  
      oct.data = ecxkey->privkey;
      oct.length = KEYLEN(pkey);
      oct.flags = 0;
  
      penclen = i2d_ASN1_OCTET_STRING(&oct, &penc);
      if (penclen < 0) {
          ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
          return 0;
      }
  
      if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(pkey->ameth->pkey_id), 0,
                           V_ASN1_UNDEF, NULL, penc, penclen)) {
          OPENSSL_clear_free(penc, penclen);
          ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
          return 0;
      }
  
      return 1;
  }
  
  static int ecx_size(const EVP_PKEY *pkey)
  {
      return KEYLEN(pkey);
  }
  
  static int ecx_bits(const EVP_PKEY *pkey)
  {
      if (IS25519(pkey->ameth->pkey_id)) {
          return X25519_BITS;
      } else if(ISX448(pkey->ameth->pkey_id)) {
          return X448_BITS;
      } else {
          return ED448_BITS;
      }
  }
  
  static int ecx_security_bits(const EVP_PKEY *pkey)
  {
      if (IS25519(pkey->ameth->pkey_id)) {
          return X25519_SECURITY_BITS;
      } else {
          return X448_SECURITY_BITS;
      }
  }
  
  static void ecx_free(EVP_PKEY *pkey)
  {
      ossl_ecx_key_free(pkey->pkey.ecx);
  }
  
  /* "parameters" are always equal */
  static int ecx_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
  {
      return 1;
  }
  
  static int ecx_key_print(BIO *bp, const EVP_PKEY *pkey, int indent,
                           ASN1_PCTX *ctx, ecx_key_op_t op)
  {
      const ECX_KEY *ecxkey = pkey->pkey.ecx;
      const char *nm = OBJ_nid2ln(pkey->ameth->pkey_id);
  
      if (op == KEY_OP_PRIVATE) {
          if (ecxkey == NULL || ecxkey->privkey == NULL) {
              if (BIO_printf(bp, "%*s<INVALID PRIVATE KEY>\n", indent, "") <= 0)
                  return 0;
              return 1;
          }
          if (BIO_printf(bp, "%*s%s Private-Key:\n", indent, "", nm) <= 0)
              return 0;
          if (BIO_printf(bp, "%*spriv:\n", indent, "") <= 0)
              return 0;
          if (ASN1_buf_print(bp, ecxkey->privkey, KEYLEN(pkey),
                             indent + 4) == 0)
              return 0;
      } else {
          if (ecxkey == NULL) {
              if (BIO_printf(bp, "%*s<INVALID PUBLIC KEY>\n", indent, "") <= 0)
                  return 0;
              return 1;
          }
          if (BIO_printf(bp, "%*s%s Public-Key:\n", indent, "", nm) <= 0)
              return 0;
      }
      if (BIO_printf(bp, "%*spub:\n", indent, "") <= 0)
          return 0;
  
      if (ASN1_buf_print(bp, ecxkey->pubkey, KEYLEN(pkey),
                         indent + 4) == 0)
          return 0;
      return 1;
  }
  
  static int ecx_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
                            ASN1_PCTX *ctx)
  {
      return ecx_key_print(bp, pkey, indent, ctx, KEY_OP_PRIVATE);
  }
  
  static int ecx_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
                           ASN1_PCTX *ctx)
  {
      return ecx_key_print(bp, pkey, indent, ctx, KEY_OP_PUBLIC);
  }
  
  static int ecx_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
  {
      switch (op) {
  
      case ASN1_PKEY_CTRL_SET1_TLS_ENCPT:
          return ecx_key_op(pkey, pkey->ameth->pkey_id, NULL, arg2, arg1,
                            KEY_OP_PUBLIC, NULL, NULL);
  
      case ASN1_PKEY_CTRL_GET1_TLS_ENCPT:
          if (pkey->pkey.ecx != NULL) {
              unsigned char **ppt = arg2;
  
              *ppt = OPENSSL_memdup(pkey->pkey.ecx->pubkey, KEYLEN(pkey));
              if (*ppt != NULL)
                  return KEYLEN(pkey);
          }
          return 0;
  
      default:
          return -2;
  
      }
  }
  
  static int ecd_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
  {
      switch (op) {
      case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
          /* We currently only support Pure EdDSA which takes no digest */
          *(int *)arg2 = NID_undef;
          return 2;
  
      default:
          return -2;
  
      }
  }
  
  static int ecx_set_priv_key(EVP_PKEY *pkey, const unsigned char *priv,
                              size_t len)
  {
      OSSL_LIB_CTX *libctx = NULL;
  
      if (pkey->keymgmt != NULL)
          libctx = ossl_provider_libctx(EVP_KEYMGMT_provider(pkey->keymgmt));
  
      return ecx_key_op(pkey, pkey->ameth->pkey_id, NULL, priv, len,
                         KEY_OP_PRIVATE, libctx, NULL);
  }
  
  static int ecx_set_pub_key(EVP_PKEY *pkey, const unsigned char *pub, size_t len)
  {
      OSSL_LIB_CTX *libctx = NULL;
  
      if (pkey->keymgmt != NULL)
          libctx = ossl_provider_libctx(EVP_KEYMGMT_provider(pkey->keymgmt));
  
      return ecx_key_op(pkey, pkey->ameth->pkey_id, NULL, pub, len,
                        KEY_OP_PUBLIC, libctx, NULL);
  }
  
  static int ecx_get_priv_key(const EVP_PKEY *pkey, unsigned char *priv,
                              size_t *len)
  {
      const ECX_KEY *key = pkey->pkey.ecx;
  
      if (priv == NULL) {
          *len = KEYLENID(pkey->ameth->pkey_id);
          return 1;
      }
  
      if (key == NULL
              || key->privkey == NULL
              || *len < (size_t)KEYLENID(pkey->ameth->pkey_id))
          return 0;
  
      *len = KEYLENID(pkey->ameth->pkey_id);
      memcpy(priv, key->privkey, *len);
  
      return 1;
  }
  
  static int ecx_get_pub_key(const EVP_PKEY *pkey, unsigned char *pub,
                             size_t *len)
  {
      const ECX_KEY *key = pkey->pkey.ecx;
  
      if (pub == NULL) {
          *len = KEYLENID(pkey->ameth->pkey_id);
          return 1;
      }
  
      if (key == NULL
              || *len < (size_t)KEYLENID(pkey->ameth->pkey_id))
          return 0;
  
      *len = KEYLENID(pkey->ameth->pkey_id);
      memcpy(pub, key->pubkey, *len);
  
      return 1;
  }
  
  static size_t ecx_pkey_dirty_cnt(const EVP_PKEY *pkey)
  {
      /*
       * We provide no mechanism to "update" an ECX key once it has been set,
       * therefore we do not have to maintain a dirty count.
       */
      return 1;
  }
  
  static int ecx_pkey_export_to(const EVP_PKEY *from, void *to_keydata,
                                EVP_KEYMGMT *to_keymgmt, OSSL_LIB_CTX *libctx,
                                const char *propq)
  {
      const ECX_KEY *key = from->pkey.ecx;
      OSSL_PARAM_BLD *tmpl = OSSL_PARAM_BLD_new();
      OSSL_PARAM *params = NULL;
      int selection = 0;
      int rv = 0;
  
      if (tmpl == NULL)
          return 0;
  
      /* A key must at least have a public part */
      if (!OSSL_PARAM_BLD_push_octet_string(tmpl, OSSL_PKEY_PARAM_PUB_KEY,
                                            key->pubkey, key->keylen))
          goto err;
      selection |= OSSL_KEYMGMT_SELECT_PUBLIC_KEY;
  
      if (key->privkey != NULL) {
          if (!OSSL_PARAM_BLD_push_octet_string(tmpl,
                                                OSSL_PKEY_PARAM_PRIV_KEY,
                                                key->privkey, key->keylen))
              goto err;
          selection |= OSSL_KEYMGMT_SELECT_PRIVATE_KEY;
      }
  
      params = OSSL_PARAM_BLD_to_param(tmpl);
  
      /* We export, the provider imports */
      rv = evp_keymgmt_import(to_keymgmt, to_keydata, selection, params);
  
   err:
      OSSL_PARAM_BLD_free(tmpl);
      OSSL_PARAM_BLD_free_params(params);
      return rv;
  }
  
  static int ecx_generic_import_from(const OSSL_PARAM params[], void *vpctx,
                                     int keytype)
  {
      EVP_PKEY_CTX *pctx = vpctx;
      EVP_PKEY *pkey = EVP_PKEY_CTX_get0_pkey(pctx);
      ECX_KEY *ecx = ossl_ecx_key_new(pctx->libctx, KEYNID2TYPE(keytype), 0,
                                      pctx->propquery);
  
      if (ecx == NULL) {
          ERR_raise(ERR_LIB_DH, ERR_R_MALLOC_FAILURE);
          return 0;
      }
  
      if (!ossl_ecx_key_fromdata(ecx, params, 1)
          || !EVP_PKEY_assign(pkey, keytype, ecx)) {
          ossl_ecx_key_free(ecx);
          return 0;
      }
      return 1;
  }
  
  static int x25519_import_from(const OSSL_PARAM params[], void *vpctx)
  {
      return ecx_generic_import_from(params, vpctx, EVP_PKEY_X25519);
  }
  
  const EVP_PKEY_ASN1_METHOD ecx25519_asn1_meth = {
      EVP_PKEY_X25519,
      EVP_PKEY_X25519,
      0,
      "X25519",
      "OpenSSL X25519 algorithm",
  
      ecx_pub_decode,
      ecx_pub_encode,
      ecx_pub_cmp,
      ecx_pub_print,
  
      NULL,
      ecx_priv_encode,
      ecx_priv_print,
  
      ecx_size,
      ecx_bits,
      ecx_security_bits,
  
      0, 0, 0, 0,
      ecx_cmp_parameters,
      0, 0,
  
      ecx_free,
      ecx_ctrl,
      NULL,
      NULL,
  
      NULL,
      NULL,
      NULL,
  
      NULL,
      NULL,
      NULL,
  
      ecx_set_priv_key,
      ecx_set_pub_key,
      ecx_get_priv_key,
      ecx_get_pub_key,
      ecx_pkey_dirty_cnt,
      ecx_pkey_export_to,
      x25519_import_from,
  
      ecx_priv_decode_ex
  };
  
  static int x448_import_from(const OSSL_PARAM params[], void *vpctx)
  {
      return ecx_generic_import_from(params, vpctx, EVP_PKEY_X448);
  }
  
  const EVP_PKEY_ASN1_METHOD ecx448_asn1_meth = {
      EVP_PKEY_X448,
      EVP_PKEY_X448,
      0,
      "X448",
      "OpenSSL X448 algorithm",
  
      ecx_pub_decode,
      ecx_pub_encode,
      ecx_pub_cmp,
      ecx_pub_print,
  
      NULL,
      ecx_priv_encode,
      ecx_priv_print,
  
      ecx_size,
      ecx_bits,
      ecx_security_bits,
  
      0, 0, 0, 0,
      ecx_cmp_parameters,
      0, 0,
  
      ecx_free,
      ecx_ctrl,
      NULL,
      NULL,
  
      NULL,
      NULL,
      NULL,
  
      NULL,
      NULL,
      NULL,
  
      ecx_set_priv_key,
      ecx_set_pub_key,
      ecx_get_priv_key,
      ecx_get_pub_key,
      ecx_pkey_dirty_cnt,
      ecx_pkey_export_to,
      x448_import_from,
  
      ecx_priv_decode_ex
  };
  
  static int ecd_size25519(const EVP_PKEY *pkey)
  {
      return ED25519_SIGSIZE;
  }
  
  static int ecd_size448(const EVP_PKEY *pkey)
  {
      return ED448_SIGSIZE;
  }
  
  static int ecd_item_verify(EVP_MD_CTX *ctx, const ASN1_ITEM *it,
                             const void *asn, const X509_ALGOR *sigalg,
                             const ASN1_BIT_STRING *str, EVP_PKEY *pkey)
  {
      const ASN1_OBJECT *obj;
      int ptype;
      int nid;
  
      /* Sanity check: make sure it is ED25519/ED448 with absent parameters */
      X509_ALGOR_get0(&obj, &ptype, NULL, sigalg);
      nid = OBJ_obj2nid(obj);
      if ((nid != NID_ED25519 && nid != NID_ED448) || ptype != V_ASN1_UNDEF) {
          ERR_raise(ERR_LIB_EC, EC_R_INVALID_ENCODING);
          return 0;
      }
  
      if (!EVP_DigestVerifyInit(ctx, NULL, NULL, NULL, pkey))
          return 0;
  
      return 2;
  }
  
  static int ecd_item_sign25519(EVP_MD_CTX *ctx, const ASN1_ITEM *it,
                                const void *asn,
                                X509_ALGOR *alg1, X509_ALGOR *alg2,
                                ASN1_BIT_STRING *str)
  {
      /* Set algorithms identifiers */
      X509_ALGOR_set0(alg1, OBJ_nid2obj(NID_ED25519), V_ASN1_UNDEF, NULL);
      if (alg2)
          X509_ALGOR_set0(alg2, OBJ_nid2obj(NID_ED25519), V_ASN1_UNDEF, NULL);
      /* Algorithm identifiers set: carry on as normal */
      return 3;
  }
  
  static int ecd_sig_info_set25519(X509_SIG_INFO *siginf, const X509_ALGOR *alg,
                                   const ASN1_STRING *sig)
  {
      X509_SIG_INFO_set(siginf, NID_undef, NID_ED25519, X25519_SECURITY_BITS,
                        X509_SIG_INFO_TLS);
      return 1;
  }
  
  static int ecd_item_sign448(EVP_MD_CTX *ctx, const ASN1_ITEM *it,
                              const void *asn,
                              X509_ALGOR *alg1, X509_ALGOR *alg2,
                              ASN1_BIT_STRING *str)
  {
      /* Set algorithm identifier */
      X509_ALGOR_set0(alg1, OBJ_nid2obj(NID_ED448), V_ASN1_UNDEF, NULL);
      if (alg2 != NULL)
          X509_ALGOR_set0(alg2, OBJ_nid2obj(NID_ED448), V_ASN1_UNDEF, NULL);
      /* Algorithm identifier set: carry on as normal */
      return 3;
  }
  
  static int ecd_sig_info_set448(X509_SIG_INFO *siginf, const X509_ALGOR *alg,
                                 const ASN1_STRING *sig)
  {
      X509_SIG_INFO_set(siginf, NID_undef, NID_ED448, X448_SECURITY_BITS,
                        X509_SIG_INFO_TLS);
      return 1;
  }
  
  static int ed25519_import_from(const OSSL_PARAM params[], void *vpctx)
  {
      return ecx_generic_import_from(params, vpctx, EVP_PKEY_ED25519);
  }
  
  const EVP_PKEY_ASN1_METHOD ed25519_asn1_meth = {
      EVP_PKEY_ED25519,
      EVP_PKEY_ED25519,
      0,
      "ED25519",
      "OpenSSL ED25519 algorithm",
  
      ecx_pub_decode,
      ecx_pub_encode,
      ecx_pub_cmp,
      ecx_pub_print,
  
      NULL,
      ecx_priv_encode,
      ecx_priv_print,
  
      ecd_size25519,
      ecx_bits,
      ecx_security_bits,
  
      0, 0, 0, 0,
      ecx_cmp_parameters,
      0, 0,
  
      ecx_free,
      ecd_ctrl,
      NULL,
      NULL,
      ecd_item_verify,
      ecd_item_sign25519,
      ecd_sig_info_set25519,
  
      NULL,
      NULL,
      NULL,
  
      ecx_set_priv_key,
      ecx_set_pub_key,
      ecx_get_priv_key,
      ecx_get_pub_key,
      ecx_pkey_dirty_cnt,
      ecx_pkey_export_to,
      ed25519_import_from,
  
      ecx_priv_decode_ex
  };
  
  static int ed448_import_from(const OSSL_PARAM params[], void *vpctx)
  {
      return ecx_generic_import_from(params, vpctx, EVP_PKEY_ED448);
  }
  
  const EVP_PKEY_ASN1_METHOD ed448_asn1_meth = {
      EVP_PKEY_ED448,
      EVP_PKEY_ED448,
      0,
      "ED448",
      "OpenSSL ED448 algorithm",
  
      ecx_pub_decode,
      ecx_pub_encode,
      ecx_pub_cmp,
      ecx_pub_print,
  
      NULL,
      ecx_priv_encode,
      ecx_priv_print,
  
      ecd_size448,
      ecx_bits,
      ecx_security_bits,
  
      0, 0, 0, 0,
      ecx_cmp_parameters,
      0, 0,
  
      ecx_free,
      ecd_ctrl,
      NULL,
      NULL,
      ecd_item_verify,
      ecd_item_sign448,
      ecd_sig_info_set448,
  
      NULL,
      NULL,
      NULL,
  
      ecx_set_priv_key,
      ecx_set_pub_key,
      ecx_get_priv_key,
      ecx_get_pub_key,
      ecx_pkey_dirty_cnt,
      ecx_pkey_export_to,
      ed448_import_from,
  
      ecx_priv_decode_ex
  };
  
  static int pkey_ecx_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
  {
      return ecx_key_op(pkey, ctx->pmeth->pkey_id, NULL, NULL, 0, KEY_OP_KEYGEN,
                        NULL, NULL);
  }
  
  static int validate_ecx_derive(EVP_PKEY_CTX *ctx, unsigned char *key,
                                            size_t *keylen,
                                            const unsigned char **privkey,
                                            const unsigned char **pubkey)
  {
      const ECX_KEY *ecxkey, *peerkey;
  
      if (ctx->pkey == NULL || ctx->peerkey == NULL) {
          ERR_raise(ERR_LIB_EC, EC_R_KEYS_NOT_SET);
          return 0;
      }
      ecxkey = ctx->pkey->pkey.ecx;
      peerkey = ctx->peerkey->pkey.ecx;
      if (ecxkey == NULL || ecxkey->privkey == NULL) {
          ERR_raise(ERR_LIB_EC, EC_R_INVALID_PRIVATE_KEY);
          return 0;
      }
      if (peerkey == NULL) {
          ERR_raise(ERR_LIB_EC, EC_R_INVALID_PEER_KEY);
          return 0;
      }
      *privkey = ecxkey->privkey;
      *pubkey = peerkey->pubkey;
  
      return 1;
  }
  
  static int pkey_ecx_derive25519(EVP_PKEY_CTX *ctx, unsigned char *key,
                                  size_t *keylen)
  {
      const unsigned char *privkey, *pubkey;
  
      if (!validate_ecx_derive(ctx, key, keylen, &privkey, &pubkey)
              || (key != NULL
                  && X25519(key, privkey, pubkey) == 0))
          return 0;
      *keylen = X25519_KEYLEN;
      return 1;
  }
  
  static int pkey_ecx_derive448(EVP_PKEY_CTX *ctx, unsigned char *key,
                                size_t *keylen)
  {
      const unsigned char *privkey, *pubkey;
  
      if (!validate_ecx_derive(ctx, key, keylen, &privkey, &pubkey)
              || (key != NULL
                  && X448(key, privkey, pubkey) == 0))
          return 0;
      *keylen = X448_KEYLEN;
      return 1;
  }
  
  static int pkey_ecx_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
  {
      /* Only need to handle peer key for derivation */
      if (type == EVP_PKEY_CTRL_PEER_KEY)
          return 1;
      return -2;
  }
  
  static const EVP_PKEY_METHOD ecx25519_pkey_meth = {
      EVP_PKEY_X25519,
      0, 0, 0, 0, 0, 0, 0,
      pkey_ecx_keygen,
      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
      pkey_ecx_derive25519,
      pkey_ecx_ctrl,
      0
  };
  
  static const EVP_PKEY_METHOD ecx448_pkey_meth = {
      EVP_PKEY_X448,
      0, 0, 0, 0, 0, 0, 0,
      pkey_ecx_keygen,
      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
      pkey_ecx_derive448,
      pkey_ecx_ctrl,
      0
  };
  
  static int pkey_ecd_digestsign25519(EVP_MD_CTX *ctx, unsigned char *sig,
                                      size_t *siglen, const unsigned char *tbs,
                                      size_t tbslen)
  {
      const ECX_KEY *edkey = EVP_MD_CTX_pkey_ctx(ctx)->pkey->pkey.ecx;
  
      if (sig == NULL) {
          *siglen = ED25519_SIGSIZE;
          return 1;
      }
      if (*siglen < ED25519_SIGSIZE) {
          ERR_raise(ERR_LIB_EC, EC_R_BUFFER_TOO_SMALL);
          return 0;
      }
  
      if (ED25519_sign(sig, tbs, tbslen, edkey->pubkey, edkey->privkey, NULL,
                       NULL) == 0)
          return 0;
      *siglen = ED25519_SIGSIZE;
      return 1;
  }
  
  static int pkey_ecd_digestsign448(EVP_MD_CTX *ctx, unsigned char *sig,
                                    size_t *siglen, const unsigned char *tbs,
                                    size_t tbslen)
  {
      const ECX_KEY *edkey = EVP_MD_CTX_pkey_ctx(ctx)->pkey->pkey.ecx;
  
      if (sig == NULL) {
          *siglen = ED448_SIGSIZE;
          return 1;
      }
      if (*siglen < ED448_SIGSIZE) {
          ERR_raise(ERR_LIB_EC, EC_R_BUFFER_TOO_SMALL);
          return 0;
      }
  
      if (ED448_sign(edkey->libctx, sig, tbs, tbslen, edkey->pubkey, edkey->privkey,
                     NULL, 0, edkey->propq) == 0)
          return 0;
      *siglen = ED448_SIGSIZE;
      return 1;
  }
  
  static int pkey_ecd_digestverify25519(EVP_MD_CTX *ctx, const unsigned char *sig,
                                        size_t siglen, const unsigned char *tbs,
                                        size_t tbslen)
  {
      const ECX_KEY *edkey = EVP_MD_CTX_pkey_ctx(ctx)->pkey->pkey.ecx;
  
      if (siglen != ED25519_SIGSIZE)
          return 0;
  
      return ED25519_verify(tbs, tbslen, sig, edkey->pubkey,
                            edkey->libctx, edkey->propq);
  }
  
  static int pkey_ecd_digestverify448(EVP_MD_CTX *ctx, const unsigned char *sig,
                                      size_t siglen, const unsigned char *tbs,
                                      size_t tbslen)
  {
      const ECX_KEY *edkey = EVP_MD_CTX_pkey_ctx(ctx)->pkey->pkey.ecx;
  
      if (siglen != ED448_SIGSIZE)
          return 0;
  
      return ED448_verify(edkey->libctx, tbs, tbslen, sig, edkey->pubkey, NULL, 0,
                          edkey->propq);
  }
  
  static int pkey_ecd_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
  {
      switch (type) {
      case EVP_PKEY_CTRL_MD:
          /* Only NULL allowed as digest */
          if (p2 == NULL || (const EVP_MD *)p2 == EVP_md_null())
              return 1;
          ERR_raise(ERR_LIB_EC, EC_R_INVALID_DIGEST_TYPE);
          return 0;
  
      case EVP_PKEY_CTRL_DIGESTINIT:
          return 1;
      }
      return -2;
  }
  
  static const EVP_PKEY_METHOD ed25519_pkey_meth = {
      EVP_PKEY_ED25519, EVP_PKEY_FLAG_SIGCTX_CUSTOM,
      0, 0, 0, 0, 0, 0,
      pkey_ecx_keygen,
      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
      pkey_ecd_ctrl,
      0,
      pkey_ecd_digestsign25519,
      pkey_ecd_digestverify25519
  };
  
  static const EVP_PKEY_METHOD ed448_pkey_meth = {
      EVP_PKEY_ED448, EVP_PKEY_FLAG_SIGCTX_CUSTOM,
      0, 0, 0, 0, 0, 0,
      pkey_ecx_keygen,
      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
      pkey_ecd_ctrl,
      0,
      pkey_ecd_digestsign448,
      pkey_ecd_digestverify448
  };
  
  #ifdef S390X_EC_ASM
  # include "s390x_arch.h"
  
  static int s390x_pkey_ecx_keygen25519(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
  {
      static const unsigned char generator[] = {
          0x09, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
      };
      ECX_KEY *key = ossl_ecx_key_new(ctx->libctx, ECX_KEY_TYPE_X25519, 1,
                                      ctx->propquery);
      unsigned char *privkey = NULL, *pubkey;
  
      if (key == NULL) {
          ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
          goto err;
      }
  
      pubkey = key->pubkey;
  
      privkey = ossl_ecx_key_allocate_privkey(key);
      if (privkey == NULL) {
          ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
          goto err;
      }
  
      if (RAND_priv_bytes_ex(ctx->libctx, privkey, X25519_KEYLEN) <= 0)
          goto err;
  
      privkey[0] &= 248;
      privkey[31] &= 127;
      privkey[31] |= 64;
  
      if (s390x_x25519_mul(pubkey, generator, privkey) != 1)
          goto err;
  
      EVP_PKEY_assign(pkey, ctx->pmeth->pkey_id, key);
      return 1;
   err:
      ossl_ecx_key_free(key);
      return 0;
  }
  
  static int s390x_pkey_ecx_keygen448(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
  {
      static const unsigned char generator[] = {
          0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
          0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
      };
      ECX_KEY *key = ossl_ecx_key_new(ctx->libctx, ECX_KEY_TYPE_X448, 1,
                                      ctx->propquery);
      unsigned char *privkey = NULL, *pubkey;
  
      if (key == NULL) {
          ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
          goto err;
      }
  
      pubkey = key->pubkey;
  
      privkey = ossl_ecx_key_allocate_privkey(key);
      if (privkey == NULL) {
          ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
          goto err;
      }
  
      if (RAND_priv_bytes_ex(ctx->libctx, privkey, X448_KEYLEN) <= 0)
          goto err;
  
      privkey[0] &= 252;
      privkey[55] |= 128;
  
      if (s390x_x448_mul(pubkey, generator, privkey) != 1)
          goto err;
  
      EVP_PKEY_assign(pkey, ctx->pmeth->pkey_id, key);
      return 1;
   err:
      ossl_ecx_key_free(key);
      return 0;
  }
  
  static int s390x_pkey_ecd_keygen25519(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
  {
      static const unsigned char generator_x[] = {
          0x1a, 0xd5, 0x25, 0x8f, 0x60, 0x2d, 0x56, 0xc9, 0xb2, 0xa7, 0x25, 0x95,
          0x60, 0xc7, 0x2c, 0x69, 0x5c, 0xdc, 0xd6, 0xfd, 0x31, 0xe2, 0xa4, 0xc0,
          0xfe, 0x53, 0x6e, 0xcd, 0xd3, 0x36, 0x69, 0x21
      };
      static const unsigned char generator_y[] = {
          0x58, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66,
          0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66,
          0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66,
      };
      unsigned char x_dst[32], buff[SHA512_DIGEST_LENGTH];
      ECX_KEY *key = ossl_ecx_key_new(ctx->libctx, ECX_KEY_TYPE_ED25519, 1,
                                      ctx->propquery);
      unsigned char *privkey = NULL, *pubkey;
      unsigned int sz;
  
      if (key == NULL) {
          ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
          goto err;
      }
  
      pubkey = key->pubkey;
  
      privkey = ossl_ecx_key_allocate_privkey(key);
      if (privkey == NULL) {
          ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
          goto err;
      }
  
      if (RAND_priv_bytes_ex(ctx->libctx, privkey, ED25519_KEYLEN) <= 0)
          goto err;
  
      if (!EVP_Digest(privkey, 32, buff, &sz, EVP_sha512(), NULL))
          goto err;
  
      buff[0] &= 248;
      buff[31] &= 63;
      buff[31] |= 64;
  
      if (s390x_ed25519_mul(x_dst, pubkey,
                            generator_x, generator_y, buff) != 1)
          goto err;
  
      pubkey[31] |= ((x_dst[0] & 0x01) << 7);
  
      EVP_PKEY_assign(pkey, ctx->pmeth->pkey_id, key);
      return 1;
   err:
      ossl_ecx_key_free(key);
      return 0;
  }
  
  static int s390x_pkey_ecd_keygen448(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
  {
      static const unsigned char generator_x[] = {
          0x5e, 0xc0, 0x0c, 0xc7, 0x2b, 0xa8, 0x26, 0x26, 0x8e, 0x93, 0x00, 0x8b,
          0xe1, 0x80, 0x3b, 0x43, 0x11, 0x65, 0xb6, 0x2a, 0xf7, 0x1a, 0xae, 0x12,
          0x64, 0xa4, 0xd3, 0xa3, 0x24, 0xe3, 0x6d, 0xea, 0x67, 0x17, 0x0f, 0x47,
          0x70, 0x65, 0x14, 0x9e, 0xda, 0x36, 0xbf, 0x22, 0xa6, 0x15, 0x1d, 0x22,
          0xed, 0x0d, 0xed, 0x6b, 0xc6, 0x70, 0x19, 0x4f, 0x00
      };
      static const unsigned char generator_y[] = {
          0x14, 0xfa, 0x30, 0xf2, 0x5b, 0x79, 0x08, 0x98, 0xad, 0xc8, 0xd7, 0x4e,
          0x2c, 0x13, 0xbd, 0xfd, 0xc4, 0x39, 0x7c, 0xe6, 0x1c, 0xff, 0xd3, 0x3a,
          0xd7, 0xc2, 0xa0, 0x05, 0x1e, 0x9c, 0x78, 0x87, 0x40, 0x98, 0xa3, 0x6c,
          0x73, 0x73, 0xea, 0x4b, 0x62, 0xc7, 0xc9, 0x56, 0x37, 0x20, 0x76, 0x88,
          0x24, 0xbc, 0xb6, 0x6e, 0x71, 0x46, 0x3f, 0x69, 0x00
      };
      unsigned char x_dst[57], buff[114];
      ECX_KEY *key = ossl_ecx_key_new(ctx->libctx, ECX_KEY_TYPE_ED448, 1,
                                      ctx->propquery);
      unsigned char *privkey = NULL, *pubkey;
      EVP_MD_CTX *hashctx = NULL;
  
      if (key == NULL) {
          ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
          goto err;
      }
  
      pubkey = key->pubkey;
  
      privkey = ossl_ecx_key_allocate_privkey(key);
      if (privkey == NULL) {
          ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
          goto err;
      }
  
      if (RAND_priv_bytes_ex(ctx->libctx, privkey, ED448_KEYLEN) <= 0)
          goto err;
  
      hashctx = EVP_MD_CTX_new();
      if (hashctx == NULL)
          goto err;
      if (EVP_DigestInit_ex(hashctx, EVP_shake256(), NULL) != 1)
          goto err;
      if (EVP_DigestUpdate(hashctx, privkey, 57) != 1)
          goto err;
      if (EVP_DigestFinalXOF(hashctx, buff, sizeof(buff)) != 1)
          goto err;
  
      buff[0] &= -4;
      buff[55] |= 0x80;
      buff[56] = 0;
  
      if (s390x_ed448_mul(x_dst, pubkey,
                          generator_x, generator_y, buff) != 1)
          goto err;
  
      pubkey[56] |= ((x_dst[0] & 0x01) << 7);
  
      EVP_PKEY_assign(pkey, ctx->pmeth->pkey_id, key);
      EVP_MD_CTX_free(hashctx);
      return 1;
   err:
      ossl_ecx_key_free(key);
      EVP_MD_CTX_free(hashctx);
      return 0;
  }
  
  static int s390x_pkey_ecx_derive25519(EVP_PKEY_CTX *ctx, unsigned char *key,
                                        size_t *keylen)
  {
      const unsigned char *privkey, *pubkey;
  
      if (!validate_ecx_derive(ctx, key, keylen, &privkey, &pubkey))
          return 0;
  
      if (key != NULL)
          return s390x_x25519_mul(key, pubkey, privkey);
  
      *keylen = X25519_KEYLEN;
      return 1;
  }
  
  static int s390x_pkey_ecx_derive448(EVP_PKEY_CTX *ctx, unsigned char *key,
                                        size_t *keylen)
  {
      const unsigned char *privkey, *pubkey;
  
      if (!validate_ecx_derive(ctx, key, keylen, &privkey, &pubkey))
          return 0;
  
      if (key != NULL)
          return s390x_x448_mul(key, pubkey, privkey);
  
      *keylen = X448_KEYLEN;
      return 1;
  }
  
  static int s390x_pkey_ecd_digestsign25519(EVP_MD_CTX *ctx,
                                            unsigned char *sig, size_t *siglen,
                                            const unsigned char *tbs,
                                            size_t tbslen)
  {
      union {
          struct {
              unsigned char sig[64];
              unsigned char priv[32];
          } ed25519;
          unsigned long long buff[512];
      } param;
      const ECX_KEY *edkey = EVP_MD_CTX_pkey_ctx(ctx)->pkey->pkey.ecx;
      int rc;
  
      if (sig == NULL) {
          *siglen = ED25519_SIGSIZE;
          return 1;
      }
  
      if (*siglen < ED25519_SIGSIZE) {
          ERR_raise(ERR_LIB_EC, EC_R_BUFFER_TOO_SMALL);
          return 0;
      }
  
      memset(&param, 0, sizeof(param));
      memcpy(param.ed25519.priv, edkey->privkey, sizeof(param.ed25519.priv));
  
      rc = s390x_kdsa(S390X_EDDSA_SIGN_ED25519, &param.ed25519, tbs, tbslen);
      OPENSSL_cleanse(param.ed25519.priv, sizeof(param.ed25519.priv));
      if (rc != 0)
          return 0;
  
      s390x_flip_endian32(sig, param.ed25519.sig);
      s390x_flip_endian32(sig + 32, param.ed25519.sig + 32);
  
      *siglen = ED25519_SIGSIZE;
      return 1;
  }
  
  static int s390x_pkey_ecd_digestsign448(EVP_MD_CTX *ctx,
                                          unsigned char *sig, size_t *siglen,
                                          const unsigned char *tbs,
                                          size_t tbslen)
  {
      union {
          struct {
              unsigned char sig[128];
              unsigned char priv[64];
          } ed448;
          unsigned long long buff[512];
      } param;
      const ECX_KEY *edkey = EVP_MD_CTX_pkey_ctx(ctx)->pkey->pkey.ecx;
      int rc;
  
      if (sig == NULL) {
          *siglen = ED448_SIGSIZE;
          return 1;
      }
  
      if (*siglen < ED448_SIGSIZE) {
          ERR_raise(ERR_LIB_EC, EC_R_BUFFER_TOO_SMALL);
          return 0;
      }
  
      memset(&param, 0, sizeof(param));
      memcpy(param.ed448.priv + 64 - 57, edkey->privkey, 57);
  
      rc = s390x_kdsa(S390X_EDDSA_SIGN_ED448, &param.ed448, tbs, tbslen);
      OPENSSL_cleanse(param.ed448.priv, sizeof(param.ed448.priv));
      if (rc != 0)
          return 0;
  
      s390x_flip_endian64(param.ed448.sig, param.ed448.sig);
      s390x_flip_endian64(param.ed448.sig + 64, param.ed448.sig + 64);
      memcpy(sig, param.ed448.sig, 57);
      memcpy(sig + 57, param.ed448.sig + 64, 57);
  
      *siglen = ED448_SIGSIZE;
      return 1;
  }
  
  static int s390x_pkey_ecd_digestverify25519(EVP_MD_CTX *ctx,
                                              const unsigned char *sig,
                                              size_t siglen,
                                              const unsigned char *tbs,
                                              size_t tbslen)
  {
      union {
          struct {
              unsigned char sig[64];
              unsigned char pub[32];
          } ed25519;
          unsigned long long buff[512];
      } param;
      const ECX_KEY *edkey = EVP_MD_CTX_pkey_ctx(ctx)->pkey->pkey.ecx;
  
      if (siglen != ED25519_SIGSIZE)
          return 0;
  
      memset(&param, 0, sizeof(param));
      s390x_flip_endian32(param.ed25519.sig, sig);
      s390x_flip_endian32(param.ed25519.sig + 32, sig + 32);
      s390x_flip_endian32(param.ed25519.pub, edkey->pubkey);
  
      return s390x_kdsa(S390X_EDDSA_VERIFY_ED25519,
                        &param.ed25519, tbs, tbslen) == 0 ? 1 : 0;
  }
  
  static int s390x_pkey_ecd_digestverify448(EVP_MD_CTX *ctx,
                                            const unsigned char *sig,
                                            size_t siglen,
                                            const unsigned char *tbs,
                                            size_t tbslen)
  {
      union {
          struct {
              unsigned char sig[128];
              unsigned char pub[64];
          } ed448;
          unsigned long long buff[512];
      } param;
      const ECX_KEY *edkey = EVP_MD_CTX_pkey_ctx(ctx)->pkey->pkey.ecx;
  
      if (siglen != ED448_SIGSIZE)
          return 0;
  
      memset(&param, 0, sizeof(param));
      memcpy(param.ed448.sig, sig, 57);
      s390x_flip_endian64(param.ed448.sig, param.ed448.sig);
      memcpy(param.ed448.sig + 64, sig + 57, 57);
      s390x_flip_endian64(param.ed448.sig + 64, param.ed448.sig + 64);
      memcpy(param.ed448.pub, edkey->pubkey, 57);
      s390x_flip_endian64(param.ed448.pub, param.ed448.pub);
  
      return s390x_kdsa(S390X_EDDSA_VERIFY_ED448,
                        &param.ed448, tbs, tbslen) == 0 ? 1 : 0;
  }
  
  static const EVP_PKEY_METHOD ecx25519_s390x_pkey_meth = {
      EVP_PKEY_X25519,
      0, 0, 0, 0, 0, 0, 0,
      s390x_pkey_ecx_keygen25519,
      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
      s390x_pkey_ecx_derive25519,
      pkey_ecx_ctrl,
      0
  };
  
  static const EVP_PKEY_METHOD ecx448_s390x_pkey_meth = {
      EVP_PKEY_X448,
      0, 0, 0, 0, 0, 0, 0,
      s390x_pkey_ecx_keygen448,
      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
      s390x_pkey_ecx_derive448,
      pkey_ecx_ctrl,
      0
  };
  static const EVP_PKEY_METHOD ed25519_s390x_pkey_meth = {
      EVP_PKEY_ED25519, EVP_PKEY_FLAG_SIGCTX_CUSTOM,
      0, 0, 0, 0, 0, 0,
      s390x_pkey_ecd_keygen25519,
      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
      pkey_ecd_ctrl,
      0,
      s390x_pkey_ecd_digestsign25519,
      s390x_pkey_ecd_digestverify25519
  };
  
  static const EVP_PKEY_METHOD ed448_s390x_pkey_meth = {
      EVP_PKEY_ED448, EVP_PKEY_FLAG_SIGCTX_CUSTOM,
      0, 0, 0, 0, 0, 0,
      s390x_pkey_ecd_keygen448,
      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
      pkey_ecd_ctrl,
      0,
      s390x_pkey_ecd_digestsign448,
      s390x_pkey_ecd_digestverify448
  };
  #endif
  
  const EVP_PKEY_METHOD *ossl_ecx25519_pkey_method(void)
  {
  #ifdef S390X_EC_ASM
      if (OPENSSL_s390xcap_P.pcc[1] & S390X_CAPBIT(S390X_SCALAR_MULTIPLY_X25519))
          return &ecx25519_s390x_pkey_meth;
  #endif
      return &ecx25519_pkey_meth;
  }
  
  const EVP_PKEY_METHOD *ossl_ecx448_pkey_method(void)
  {
  #ifdef S390X_EC_ASM
      if (OPENSSL_s390xcap_P.pcc[1] & S390X_CAPBIT(S390X_SCALAR_MULTIPLY_X448))
          return &ecx448_s390x_pkey_meth;
  #endif
      return &ecx448_pkey_meth;
  }
  
  const EVP_PKEY_METHOD *ossl_ed25519_pkey_method(void)
  {
  #ifdef S390X_EC_ASM
      if (OPENSSL_s390xcap_P.pcc[1] & S390X_CAPBIT(S390X_SCALAR_MULTIPLY_ED25519)
          && OPENSSL_s390xcap_P.kdsa[0] & S390X_CAPBIT(S390X_EDDSA_SIGN_ED25519)
          && OPENSSL_s390xcap_P.kdsa[0]
              & S390X_CAPBIT(S390X_EDDSA_VERIFY_ED25519))
          return &ed25519_s390x_pkey_meth;
  #endif
      return &ed25519_pkey_meth;
  }
  
  const EVP_PKEY_METHOD *ossl_ed448_pkey_method(void)
  {
  #ifdef S390X_EC_ASM
      if (OPENSSL_s390xcap_P.pcc[1] & S390X_CAPBIT(S390X_SCALAR_MULTIPLY_ED448)
          && OPENSSL_s390xcap_P.kdsa[0] & S390X_CAPBIT(S390X_EDDSA_SIGN_ED448)
          && OPENSSL_s390xcap_P.kdsa[0] & S390X_CAPBIT(S390X_EDDSA_VERIFY_ED448))
          return &ed448_s390x_pkey_meth;
  #endif
      return &ed448_pkey_meth;
  }
  