/* ====================================================================

 * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 *

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in

 *    the documentation and/or other materials provided with the

 *    distribution.

 *

 * 3. All advertising materials mentioning features or use of this

 *    software must display the following acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"

 *

 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to

 *    endorse or promote products derived from this software without

 *    prior written permission. For written permission, please contact

 *    licensing@OpenSSL.org.

 *

 * 5. Products derived from this software may not be called "OpenSSL"

 *    nor may "OpenSSL" appear in their names without prior written

 *    permission of the OpenSSL Project.

 *

 * 6. Redistributions of any form whatsoever must retain the following

 *    acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"

 *

 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY

 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR

 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED

 * OF THE POSSIBILITY OF SUCH DAMAGE.

 * ====================================================================

 *

 * This product includes cryptographic software written by Eric Young

 * (eay@cryptsoft.com).  This product includes software written by Tim

 * Hudson (tjh@cryptsoft.com). */

#include <openssl/evp.h>

#include <openssl/bio.h>

#include <openssl/bn.h>

#include <openssl/dsa.h>

#include <openssl/ec.h>

#include <openssl/ec_key.h>

#include <openssl/mem.h>

#include <openssl/rsa.h>

#include "../internal.h"

#include "../fipsmodule/rsa/internal.h"

static int print_hex(BIO *bp, const uint8_t *data, size_t len, int off) {

  for (size_t i = 0; i < len; i++) {

    if ((i % 15) == 0) {

      if (BIO_puts(bp, "\n") <= 0 ||  //

          !BIO_indent(bp, off + 4, 128)) {

        return 0;

      }

    }

    if (BIO_printf(bp, "%02x%s", data[i], (i + 1 == len) ? "" : ":") <= 0) {

      return 0;

    }

  }

  if (BIO_write(bp, "\n", 1) <= 0) {

    return 0;

  }

  return 1;

}

static int bn_print(BIO *bp, const char *name, const BIGNUM *num, int off) {

  if (num == NULL) {

    return 1;

  }

  if (!BIO_indent(bp, off, 128)) {

    return 0;

  }

  if (BN_is_zero(num)) {

    if (BIO_printf(bp, "%s 0\n", name) <= 0) {

      return 0;

    }

    return 1;

  }

  uint64_t u64;

  if (BN_get_u64(num, &u64)) {

    const char *neg = BN_is_negative(num) ? "-" : "";

    return BIO_printf(bp, "%s %s%" PRIu64 " (%s0x%" PRIx64 ")\n", name, neg,

                      u64, neg, u64) > 0;

  }

  if (BIO_printf(bp, "%s%s", name,

                  (BN_is_negative(num)) ? " (Negative)" : "") <= 0) {

    return 0;

  }

  // Print |num| in hex, adding a leading zero, as in ASN.1, if the high bit

  // is set.

  //

  // TODO(davidben): Do we need to do this? We already print "(Negative)" above

  // and negative values are never valid in keys anyway.

  size_t len = BN_num_bytes(num);

  uint8_t *buf = OPENSSL_malloc(len + 1);

  if (buf == NULL) {

    return 0;

  }

  buf[0] = 0;

  BN_bn2bin(num, buf + 1);

  int ret;

  if (len > 0 && (buf[1] & 0x80) != 0) {

    // Print the whole buffer.

    ret = print_hex(bp, buf, len + 1, off);

  } else {

    // Skip the leading zero.

    ret = print_hex(bp, buf + 1, len, off);

  }

  OPENSSL_free(buf);

  return ret;

}

// RSA keys.

static int do_rsa_print(BIO *out, const RSA *rsa, int off,

                        int include_private) {

  int mod_len = 0;

  if (rsa->n != NULL) {

    mod_len = BN_num_bits(rsa->n);

  }

  if (!BIO_indent(out, off, 128)) {

    return 0;

  }

  const char *s, *str;

  if (include_private && rsa->d) {

    if (BIO_printf(out, "Private-Key: (%d bit)\n", mod_len) <= 0) {

      return 0;

    }

    str = "modulus:";

    s = "publicExponent:";

  } else {

    if (BIO_printf(out, "Public-Key: (%d bit)\n", mod_len) <= 0) {

      return 0;

    }

    str = "Modulus:";

    s = "Exponent:";

  }

  if (!bn_print(out, str, rsa->n, off) ||

      !bn_print(out, s, rsa->e, off)) {

    return 0;

  }

  if (include_private) {

    if (!bn_print(out, "privateExponent:", rsa->d, off) ||

        !bn_print(out, "prime1:", rsa->p, off) ||

        !bn_print(out, "prime2:", rsa->q, off) ||

        !bn_print(out, "exponent1:", rsa->dmp1, off) ||

        !bn_print(out, "exponent2:", rsa->dmq1, off) ||

        !bn_print(out, "coefficient:", rsa->iqmp, off)) {

      return 0;

    }

  }

  return 1;

}

static int rsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent) {

  return do_rsa_print(bp, EVP_PKEY_get0_RSA(pkey), indent, 0);

}

static int rsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent) {

  return do_rsa_print(bp, EVP_PKEY_get0_RSA(pkey), indent, 1);

}

// DSA keys.

static int do_dsa_print(BIO *bp, const DSA *x, int off, int ptype) {

  const BIGNUM *priv_key = NULL;

  if (ptype == 2) {

    priv_key = DSA_get0_priv_key(x);

  }

  const BIGNUM *pub_key = NULL;

  if (ptype > 0) {

    pub_key = DSA_get0_pub_key(x);

  }

  const char *ktype = "DSA-Parameters";

  if (ptype == 2) {

    ktype = "Private-Key";

  } else if (ptype == 1) {

    ktype = "Public-Key";

  }

  if (!BIO_indent(bp, off, 128) ||

      BIO_printf(bp, "%s: (%u bit)\n", ktype, BN_num_bits(DSA_get0_p(x))) <=

          0 ||

      // |priv_key| and |pub_key| may be NULL, in which case |bn_print| will

      // silently skip them.

      !bn_print(bp, "priv:", priv_key, off) ||

      !bn_print(bp, "pub:", pub_key, off) ||

      !bn_print(bp, "P:", DSA_get0_p(x), off) ||

      !bn_print(bp, "Q:", DSA_get0_q(x), off) ||

      !bn_print(bp, "G:", DSA_get0_g(x), off)) {

    return 0;

  }

  return 1;

}

static int dsa_param_print(BIO *bp, const EVP_PKEY *pkey, int indent) {

  return do_dsa_print(bp, EVP_PKEY_get0_DSA(pkey), indent, 0);

}

static int dsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent) {

  return do_dsa_print(bp, EVP_PKEY_get0_DSA(pkey), indent, 1);

}

static int dsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent) {

  return do_dsa_print(bp, EVP_PKEY_get0_DSA(pkey), indent, 2);

}

// EC keys.

static int do_EC_KEY_print(BIO *bp, const EC_KEY *x, int off, int ktype) {

  const EC_GROUP *group;

  if (x == NULL || (group = EC_KEY_get0_group(x)) == NULL) {

    OPENSSL_PUT_ERROR(EVP, ERR_R_PASSED_NULL_PARAMETER);

    return 0;

  }

  const char *ecstr;

  if (ktype == 2) {

    ecstr = "Private-Key";

  } else if (ktype == 1) {

    ecstr = "Public-Key";

  } else {

    ecstr = "ECDSA-Parameters";

  }

  if (!BIO_indent(bp, off, 128)) {

    return 0;

  }

  int curve_name = EC_GROUP_get_curve_name(group);

  if (BIO_printf(bp, "%s: (%s)\n", ecstr,

                 curve_name == NID_undef

                     ? "unknown curve"

                     : EC_curve_nid2nist(curve_name)) <= 0) {

    return 0;

  }

  if (ktype == 2) {

    const BIGNUM *priv_key = EC_KEY_get0_private_key(x);

    if (priv_key != NULL &&  //

        !bn_print(bp, "priv:", priv_key, off)) {

      return 0;

    }

  }

  if (ktype > 0 && EC_KEY_get0_public_key(x) != NULL) {

    uint8_t *pub = NULL;

    size_t pub_len = EC_KEY_key2buf(x, EC_KEY_get_conv_form(x), &pub, NULL);

    if (pub_len == 0) {

      return 0;

    }

    int ret = BIO_indent(bp, off, 128) &&  //

              BIO_puts(bp, "pub:") > 0 &&  //

              print_hex(bp, pub, pub_len, off);

    OPENSSL_free(pub);

    if (!ret) {

      return 0;

    }

  }

  return 1;

}

static int eckey_param_print(BIO *bp, const EVP_PKEY *pkey, int indent) {

  return do_EC_KEY_print(bp, EVP_PKEY_get0_EC_KEY(pkey), indent, 0);

}

static int eckey_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent) {

  return do_EC_KEY_print(bp, EVP_PKEY_get0_EC_KEY(pkey), indent, 1);

}

static int eckey_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent) {

  return do_EC_KEY_print(bp, EVP_PKEY_get0_EC_KEY(pkey), indent, 2);

}

typedef struct {

  int type;

  int (*pub_print)(BIO *out, const EVP_PKEY *pkey, int indent);

  int (*priv_print)(BIO *out, const EVP_PKEY *pkey, int indent);

  int (*param_print)(BIO *out, const EVP_PKEY *pkey, int indent);

} EVP_PKEY_PRINT_METHOD;

static EVP_PKEY_PRINT_METHOD kPrintMethods[] = {

    {

        EVP_PKEY_RSA,

        rsa_pub_print,

        rsa_priv_print,

        NULL /* param_print */,

    },

    {

        EVP_PKEY_DSA,

        dsa_pub_print,

        dsa_priv_print,

        dsa_param_print,

    },

    {

        EVP_PKEY_EC,

        eckey_pub_print,

        eckey_priv_print,

        eckey_param_print,

    },

};

static size_t kPrintMethodsLen = OPENSSL_ARRAY_SIZE(kPrintMethods);

static EVP_PKEY_PRINT_METHOD *find_method(int type) {

  for (size_t i = 0; i < kPrintMethodsLen; i++) {

    if (kPrintMethods[i].type == type) {

      return &kPrintMethods[i];

    }

  }

  return NULL;

}

static int print_unsupported(BIO *out, const EVP_PKEY *pkey, int indent,

                             const char *kstr) {

  BIO_indent(out, indent, 128);

  BIO_printf(out, "%s algorithm unsupported\n", kstr);

  return 1;

}

int EVP_PKEY_print_public(BIO *out, const EVP_PKEY *pkey, int indent,

                          ASN1_PCTX *pctx) {

  EVP_PKEY_PRINT_METHOD *method = find_method(EVP_PKEY_id(pkey));

  if (method != NULL && method->pub_print != NULL) {

    return method->pub_print(out, pkey, indent);

  }

  return print_unsupported(out, pkey, indent, "Public Key");

}

int EVP_PKEY_print_private(BIO *out, const EVP_PKEY *pkey, int indent,

                           ASN1_PCTX *pctx) {

  EVP_PKEY_PRINT_METHOD *method = find_method(EVP_PKEY_id(pkey));

  if (method != NULL && method->priv_print != NULL) {

    return method->priv_print(out, pkey, indent);

  }

  return print_unsupported(out, pkey, indent, "Private Key");

}

int EVP_PKEY_print_params(BIO *out, const EVP_PKEY *pkey, int indent,

                          ASN1_PCTX *pctx) {

  EVP_PKEY_PRINT_METHOD *method = find_method(EVP_PKEY_id(pkey));

  if (method != NULL && method->param_print != NULL) {

    return method->param_print(out, pkey, indent);

  }

  return print_unsupported(out, pkey, indent, "Parameters");

}