/* crypto/evp/evp_lib.c */

/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)

 * All rights reserved.

 *

 * This package is an SSL implementation written

 * by Eric Young (eay@cryptsoft.com).

 * The implementation was written so as to conform with Netscapes SSL.

 *

 * This library is free for commercial and non-commercial use as long as

 * the following conditions are aheared to.  The following conditions

 * apply to all code found in this distribution, be it the RC4, RSA,

 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation

 * included with this distribution is covered by the same copyright terms

 * except that the holder is Tim Hudson (tjh@cryptsoft.com).

 *

 * Copyright remains Eric Young's, and as such any Copyright notices in

 * the code are not to be removed.

 * If this package is used in a product, Eric Young should be given attribution

 * as the author of the parts of the library used.

 * This can be in the form of a textual message at program startup or

 * in documentation (online or textual) provided with the package.

 *

 * 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 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 acknowledgement:

 *    "This product includes cryptographic software written by

 *     Eric Young (eay@cryptsoft.com)"

 *    The word 'cryptographic' can be left out if the rouines from the library

 *    being used are not cryptographic related :-).

 * 4. If you include any Windows specific code (or a derivative thereof) from

 *    the apps directory (application code) you must include an acknowledgement:

 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"

 *

 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND

 * ANY EXPRESS 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 AUTHOR OR 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.

 *

 * The licence and distribution terms for any publically available version or

 * derivative of this code cannot be changed.  i.e. this code cannot simply be

 * copied and put under another distribution licence

 * [including the GNU Public Licence.]

 */

#include <stdio.h>

#include "cryptlib.h"

#include <openssl/evp.h>

#include <openssl/objects.h>

#ifdef OPENSSL_FIPS

# include <openssl/fips.h>

# include "evp_locl.h"

#endif

int EVP_CIPHER_param_to_asn1(EVP_CIPHER_CTX *c, ASN1_TYPE *type)

{

    int ret;

    if (c->cipher->set_asn1_parameters != NULL)

        ret = c->cipher->set_asn1_parameters(c, type);

    else if (c->cipher->flags & EVP_CIPH_FLAG_DEFAULT_ASN1) {

        switch (EVP_CIPHER_CTX_mode(c)) {

        case EVP_CIPH_WRAP_MODE:

            if (EVP_CIPHER_CTX_nid(c) == NID_id_smime_alg_CMS3DESwrap)

                ASN1_TYPE_set(type, V_ASN1_NULL, NULL);

            ret = 1;

            break;

        case EVP_CIPH_GCM_MODE:

        case EVP_CIPH_CCM_MODE:

        case EVP_CIPH_XTS_MODE:

            ret = -1;

            break;

        default:

            ret = EVP_CIPHER_set_asn1_iv(c, type);

        }

    } else

        ret = -1;

    return (ret);

}

int EVP_CIPHER_asn1_to_param(EVP_CIPHER_CTX *c, ASN1_TYPE *type)

{

    int ret;

    if (c->cipher->get_asn1_parameters != NULL)

        ret = c->cipher->get_asn1_parameters(c, type);

    else if (c->cipher->flags & EVP_CIPH_FLAG_DEFAULT_ASN1) {

        switch (EVP_CIPHER_CTX_mode(c)) {

        case EVP_CIPH_WRAP_MODE:

            ret = 1;

            break;

        case EVP_CIPH_GCM_MODE:

        case EVP_CIPH_CCM_MODE:

        case EVP_CIPH_XTS_MODE:

            ret = -1;

            break;

        default:

            ret = EVP_CIPHER_get_asn1_iv(c, type);

            break;

        }

    } else

        ret = -1;

    return (ret);

}

int EVP_CIPHER_get_asn1_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)

{

    int i = 0;

    unsigned int l;

    if (type != NULL) {

        l = EVP_CIPHER_CTX_iv_length(c);

        OPENSSL_assert(l <= sizeof(c->iv));

        i = ASN1_TYPE_get_octetstring(type, c->oiv, l);

        if (i != (int)l)

            return (-1);

        else if (i > 0)

            memcpy(c->iv, c->oiv, l);

    }

    return (i);

}

int EVP_CIPHER_set_asn1_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)

{

    int i = 0;

    unsigned int j;

    if (type != NULL) {

        j = EVP_CIPHER_CTX_iv_length(c);

        OPENSSL_assert(j <= sizeof(c->iv));

        i = ASN1_TYPE_set_octetstring(type, c->oiv, j);

    }

    return (i);

}

/* Convert the various cipher NIDs and dummies to a proper OID NID */

int EVP_CIPHER_type(const EVP_CIPHER *ctx)

{

    int nid;

    ASN1_OBJECT *otmp;

    nid = EVP_CIPHER_nid(ctx);

    switch (nid) {

    case NID_rc2_cbc:

    case NID_rc2_64_cbc:

    case NID_rc2_40_cbc:

        return NID_rc2_cbc;

    case NID_rc4:

    case NID_rc4_40:

        return NID_rc4;

    case NID_aes_128_cfb128:

    case NID_aes_128_cfb8:

    case NID_aes_128_cfb1:

        return NID_aes_128_cfb128;

    case NID_aes_192_cfb128:

    case NID_aes_192_cfb8:

    case NID_aes_192_cfb1:

        return NID_aes_192_cfb128;

    case NID_aes_256_cfb128:

    case NID_aes_256_cfb8:

    case NID_aes_256_cfb1:

        return NID_aes_256_cfb128;

    case NID_des_cfb64:

    case NID_des_cfb8:

    case NID_des_cfb1:

        return NID_des_cfb64;

    case NID_des_ede3_cfb64:

    case NID_des_ede3_cfb8:

    case NID_des_ede3_cfb1:

        return NID_des_cfb64;

    default:

        /* Check it has an OID and it is valid */

        otmp = OBJ_nid2obj(nid);

        if (!otmp || !otmp->data)

            nid = NID_undef;

        ASN1_OBJECT_free(otmp);

        return nid;

    }

}

int EVP_CIPHER_block_size(const EVP_CIPHER *e)

{

    return e->block_size;

}

int EVP_CIPHER_CTX_block_size(const EVP_CIPHER_CTX *ctx)

{

    return ctx->cipher->block_size;

}

int EVP_Cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,

               const unsigned char *in, unsigned int inl)

{

    return ctx->cipher->do_cipher(ctx, out, in, inl);

}

const EVP_CIPHER *EVP_CIPHER_CTX_cipher(const EVP_CIPHER_CTX *ctx)

{

    return ctx->cipher;

}

unsigned long EVP_CIPHER_flags(const EVP_CIPHER *cipher)

{

#ifdef OPENSSL_FIPS

    const EVP_CIPHER *fcipher;

    fcipher = evp_get_fips_cipher(cipher);

    if (fcipher && fcipher->flags & EVP_CIPH_FLAG_FIPS)

        return cipher->flags | EVP_CIPH_FLAG_FIPS;

#endif

    return cipher->flags;

}

unsigned long EVP_CIPHER_CTX_flags(const EVP_CIPHER_CTX *ctx)

{

#ifdef OPENSSL_FIPS

    return EVP_CIPHER_flags(ctx->cipher);

#else

    return ctx->cipher->flags;

#endif

}

void *EVP_CIPHER_CTX_get_app_data(const EVP_CIPHER_CTX *ctx)

{

    return ctx->app_data;

}

void EVP_CIPHER_CTX_set_app_data(EVP_CIPHER_CTX *ctx, void *data)

{

    ctx->app_data = data;

}

int EVP_CIPHER_iv_length(const EVP_CIPHER *cipher)

{

    return cipher->iv_len;

}

int EVP_CIPHER_CTX_iv_length(const EVP_CIPHER_CTX *ctx)

{

    return ctx->cipher->iv_len;

}

int EVP_CIPHER_key_length(const EVP_CIPHER *cipher)

{

    return cipher->key_len;

}

int EVP_CIPHER_CTX_key_length(const EVP_CIPHER_CTX *ctx)

{

    return ctx->key_len;

}

int EVP_CIPHER_nid(const EVP_CIPHER *cipher)

{

    return cipher->nid;

}

int EVP_CIPHER_CTX_nid(const EVP_CIPHER_CTX *ctx)

{

    return ctx->cipher->nid;

}

int EVP_MD_block_size(const EVP_MD *md)

{

    return md->block_size;

}

int EVP_MD_type(const EVP_MD *md)

{

    return md->type;

}

int EVP_MD_pkey_type(const EVP_MD *md)

{

    return md->pkey_type;

}

int EVP_MD_size(const EVP_MD *md)

{

    if (!md) {

        EVPerr(EVP_F_EVP_MD_SIZE, EVP_R_MESSAGE_DIGEST_IS_NULL);

        return -1;

    }

    return md->md_size;

}

#ifdef OPENSSL_FIPS

const EVP_MD *evp_get_fips_md(const EVP_MD *md)

{

    int nid = EVP_MD_type(md);

    if (nid == NID_dsa)

        return FIPS_evp_dss1();

    else if (nid == NID_dsaWithSHA)

        return FIPS_evp_dss();

    else if (nid == NID_ecdsa_with_SHA1)

        return FIPS_evp_ecdsa();

    else

        return FIPS_get_digestbynid(nid);

}

const EVP_CIPHER *evp_get_fips_cipher(const EVP_CIPHER *cipher)

{

    int nid = cipher->nid;

    if (nid == NID_undef)

        return FIPS_evp_enc_null();

    else

        return FIPS_get_cipherbynid(nid);

}

#endif

unsigned long EVP_MD_flags(const EVP_MD *md)

{

#ifdef OPENSSL_FIPS

    const EVP_MD *fmd;

    fmd = evp_get_fips_md(md);

    if (fmd && fmd->flags & EVP_MD_FLAG_FIPS)

        return md->flags | EVP_MD_FLAG_FIPS;

#endif

    return md->flags;

}

const EVP_MD *EVP_MD_CTX_md(const EVP_MD_CTX *ctx)

{

    if (!ctx)

        return NULL;

    return ctx->digest;

}

void EVP_MD_CTX_set_flags(EVP_MD_CTX *ctx, int flags)

{

    ctx->flags |= flags;

}

void EVP_MD_CTX_clear_flags(EVP_MD_CTX *ctx, int flags)

{

    ctx->flags &= ~flags;

}

int EVP_MD_CTX_test_flags(const EVP_MD_CTX *ctx, int flags)

{

    return (ctx->flags & flags);

}

void EVP_CIPHER_CTX_set_flags(EVP_CIPHER_CTX *ctx, int flags)

{

    ctx->flags |= flags;

}

void EVP_CIPHER_CTX_clear_flags(EVP_CIPHER_CTX *ctx, int flags)

{

    ctx->flags &= ~flags;

}

int EVP_CIPHER_CTX_test_flags(const EVP_CIPHER_CTX *ctx, int flags)

{

    return (ctx->flags & flags);

}