text: /*
   * Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
   * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
   *
   * Licensed under the OpenSSL license (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
   */
  
  #include <stdio.h>
  #include "internal/cryptlib.h"
  #include <openssl/evp.h>
  #include <openssl/ec.h>
  #include <openssl/bn.h>
  
  #ifndef OPENSSL_NO_STDIO
  int ECPKParameters_print_fp(FILE *fp, const EC_GROUP *x, int off)
  {
      BIO *b;
      int ret;
  
      if ((b = BIO_new(BIO_s_file())) == NULL) {
          ECerr(EC_F_ECPKPARAMETERS_PRINT_FP, ERR_R_BUF_LIB);
          return 0;
      }
      BIO_set_fp(b, fp, BIO_NOCLOSE);
      ret = ECPKParameters_print(b, x, off);
      BIO_free(b);
      return ret;
  }
  
  int EC_KEY_print_fp(FILE *fp, const EC_KEY *x, int off)
  {
      BIO *b;
      int ret;
  
      if ((b = BIO_new(BIO_s_file())) == NULL) {
          ECerr(EC_F_EC_KEY_PRINT_FP, ERR_R_BIO_LIB);
          return 0;
      }
      BIO_set_fp(b, fp, BIO_NOCLOSE);
      ret = EC_KEY_print(b, x, off);
      BIO_free(b);
      return ret;
  }
  
  int ECParameters_print_fp(FILE *fp, const EC_KEY *x)
  {
      BIO *b;
      int ret;
  
      if ((b = BIO_new(BIO_s_file())) == NULL) {
          ECerr(EC_F_ECPARAMETERS_PRINT_FP, ERR_R_BIO_LIB);
          return 0;
      }
      BIO_set_fp(b, fp, BIO_NOCLOSE);
      ret = ECParameters_print(b, x);
      BIO_free(b);
      return ret;
  }
  #endif
  
  static int print_bin(BIO *fp, const char *str, const unsigned char *num,
                       size_t len, int off);
  
  int ECPKParameters_print(BIO *bp, const EC_GROUP *x, int off)
  {
      int ret = 0, reason = ERR_R_BIO_LIB;
      BN_CTX *ctx = NULL;
      const EC_POINT *point = NULL;
      BIGNUM *p = NULL, *a = NULL, *b = NULL, *gen = NULL;
      const BIGNUM *order = NULL, *cofactor = NULL;
      const unsigned char *seed;
      size_t seed_len = 0;
  
      static const char *gen_compressed = "Generator (compressed):";
      static const char *gen_uncompressed = "Generator (uncompressed):";
      static const char *gen_hybrid = "Generator (hybrid):";
  
      if (!x) {
          reason = ERR_R_PASSED_NULL_PARAMETER;
          goto err;
      }
  
      ctx = BN_CTX_new();
      if (ctx == NULL) {
          reason = ERR_R_MALLOC_FAILURE;
          goto err;
      }
  
      if (EC_GROUP_get_asn1_flag(x)) {
          /* the curve parameter are given by an asn1 OID */
          int nid;
          const char *nname;
  
          if (!BIO_indent(bp, off, 128))
              goto err;
  
          nid = EC_GROUP_get_curve_name(x);
          if (nid == 0)
              goto err;
          if (BIO_printf(bp, "ASN1 OID: %s", OBJ_nid2sn(nid)) <= 0)
              goto err;
          if (BIO_printf(bp, "\n") <= 0)
              goto err;
          nname = EC_curve_nid2nist(nid);
          if (nname) {
              if (!BIO_indent(bp, off, 128))
                  goto err;
              if (BIO_printf(bp, "NIST CURVE: %s\n", nname) <= 0)
                  goto err;
          }
      } else {
          /* explicit parameters */
          int is_char_two = 0;
          point_conversion_form_t form;
          int tmp_nid = EC_METHOD_get_field_type(EC_GROUP_method_of(x));
  
          if (tmp_nid == NID_X9_62_characteristic_two_field)
              is_char_two = 1;
  
          if ((p = BN_new()) == NULL || (a = BN_new()) == NULL ||
              (b = BN_new()) == NULL) {
              reason = ERR_R_MALLOC_FAILURE;
              goto err;
          }
  
          if (!EC_GROUP_get_curve(x, p, a, b, ctx)) {
              reason = ERR_R_EC_LIB;
              goto err;
          }
  
          if ((point = EC_GROUP_get0_generator(x)) == NULL) {
              reason = ERR_R_EC_LIB;
              goto err;
          }
          order = EC_GROUP_get0_order(x);
          cofactor = EC_GROUP_get0_cofactor(x);
          if (order == NULL) {
              reason = ERR_R_EC_LIB;
              goto err;
          }
  
          form = EC_GROUP_get_point_conversion_form(x);
  
          if ((gen = EC_POINT_point2bn(x, point, form, NULL, ctx)) == NULL) {
              reason = ERR_R_EC_LIB;
              goto err;
          }
  
          if ((seed = EC_GROUP_get0_seed(x)) != NULL)
              seed_len = EC_GROUP_get_seed_len(x);
  
          if (!BIO_indent(bp, off, 128))
              goto err;
  
          /* print the 'short name' of the field type */
          if (BIO_printf(bp, "Field Type: %s\n", OBJ_nid2sn(tmp_nid))
              <= 0)
              goto err;
  
          if (is_char_two) {
              /* print the 'short name' of the base type OID */
              int basis_type = EC_GROUP_get_basis_type(x);
              if (basis_type == 0)
                  goto err;
  
              if (!BIO_indent(bp, off, 128))
                  goto err;
  
              if (BIO_printf(bp, "Basis Type: %s\n",
                             OBJ_nid2sn(basis_type)) <= 0)
                  goto err;
  
              /* print the polynomial */
              if ((p != NULL) && !ASN1_bn_print(bp, "Polynomial:", p, NULL,
                                                off))
                  goto err;
          } else {
              if ((p != NULL) && !ASN1_bn_print(bp, "Prime:", p, NULL, off))
                  goto err;
          }
          if ((a != NULL) && !ASN1_bn_print(bp, "A:   ", a, NULL, off))
              goto err;
          if ((b != NULL) && !ASN1_bn_print(bp, "B:   ", b, NULL, off))
              goto err;
          if (form == POINT_CONVERSION_COMPRESSED) {
              if ((gen != NULL) && !ASN1_bn_print(bp, gen_compressed, gen,
                                                  NULL, off))
                  goto err;
          } else if (form == POINT_CONVERSION_UNCOMPRESSED) {
              if ((gen != NULL) && !ASN1_bn_print(bp, gen_uncompressed, gen,
                                                  NULL, off))
                  goto err;
          } else {                /* form == POINT_CONVERSION_HYBRID */
  
              if ((gen != NULL) && !ASN1_bn_print(bp, gen_hybrid, gen,
                                                  NULL, off))
                  goto err;
          }
          if ((order != NULL) && !ASN1_bn_print(bp, "Order: ", order,
                                                NULL, off))
              goto err;
          if ((cofactor != NULL) && !ASN1_bn_print(bp, "Cofactor: ", cofactor,
                                                   NULL, off))
              goto err;
          if (seed && !print_bin(bp, "Seed:", seed, seed_len, off))
              goto err;
      }
      ret = 1;
   err:
      if (!ret)
          ECerr(EC_F_ECPKPARAMETERS_PRINT, reason);
      BN_free(p);
      BN_free(a);
      BN_free(b);
      BN_free(gen);
      BN_CTX_free(ctx);
      return ret;
  }
  
  static int print_bin(BIO *fp, const char *name, const unsigned char *buf,
                       size_t len, int off)
  {
      size_t i;
      char str[128 + 1 + 4];
  
      if (buf == NULL)
          return 1;
      if (off > 0) {
          if (off > 128)
              off = 128;
          memset(str, ' ', off);
          if (BIO_write(fp, str, off) <= 0)
              return 0;
      } else {
          off = 0;
      }
  
      if (BIO_printf(fp, "%s", name) <= 0)
          return 0;
  
      for (i = 0; i < len; i++) {
          if ((i % 15) == 0) {
              str[0] = '\n';
              memset(&(str[1]), ' ', off + 4);
              if (BIO_write(fp, str, off + 1 + 4) <= 0)
                  return 0;
          }
          if (BIO_printf(fp, "%02x%s", buf[i], ((i + 1) == len) ? "" : ":") <=
              0)
              return 0;
      }
      if (BIO_write(fp, "\n", 1) <= 0)
          return 0;
  
      return 1;
  }
  