xref: /src/crypto/external/bsd/heimdal/dist/lib/hcrypto/evp-cc.c

/*	$NetBSD: evp-cc.c,v 1.3 2023/06/19 21:41:43 christos Exp $	*/

/*
 * Copyright (c) 2008 Kungliga Tekniska Hgskolan
 * (Royal Institute of Technology, Stockholm, Sweden).
 * All rights reserved.
 *
 * Portions Copyright (c) 2009 Apple Inc. 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. Neither the name of the Institute nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE 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.
 */

/* CommonCrypto provider */

#ifdef __APPLE__

#include <config.h>
#include <krb5/roken.h>

#include <assert.h>

#ifdef HAVE_COMMONCRYPTO_COMMONDIGEST_H
#include <CommonCrypto/CommonDigest.h>
#endif
#ifdef HAVE_COMMONCRYPTO_COMMONCRYPTOR_H
#include <CommonCrypto/CommonCryptor.h>
#endif

#include <evp.h>
#include <evp-hcrypto.h>
#include <evp-cc.h>

/*
 *
 */

#ifdef HAVE_COMMONCRYPTO_COMMONCRYPTOR_H

struct cc_key {
    CCCryptorRef href;
};

static int
cc_do_cipher(EVP_CIPHER_CTX *ctx,
	     unsigned char *out,
	     const unsigned char *in,
	     unsigned int size)
{
    struct cc_key *cc = ctx->cipher_data;
    CCCryptorStatus ret;
    size_t moved;

    memcpy(out, in, size);

    ret = CCCryptorUpdate(cc->href, in, size, out, size, &moved);
    if (ret)
	return 0;

    if (moved != size)
	return 0;

    return 1;
}

static int
cc_cleanup(EVP_CIPHER_CTX *ctx)
{
    struct cc_key *cc = ctx->cipher_data;
    if (cc->href)
	CCCryptorRelease(cc->href);
    return 1;
}

static int
init_cc_key(int encp, unsigned long flags,
	    CCAlgorithm alg, const void *key, size_t keylen,
	    const void *iv, CCCryptorRef *ref)
{
    CCOperation op = encp ? kCCEncrypt : kCCDecrypt;
    CCMode mode;
    CCModeOptions options = 0;
    CCCryptorStatus ret;

    if (*ref) {
	if (key == NULL && iv) {
	    CCCryptorReset(*ref, iv);
	    return 1;
	}
	CCCryptorRelease(*ref);
    }

    if (key) {
	switch (flags & EVP_CIPH_MODE) {
	case EVP_CIPH_STREAM_CIPHER:
	    mode = kCCModeRC4;
	    break;
	case EVP_CIPH_CFB8_MODE:
	    mode = kCCModeCFB8;
	    break;
	default:
	    mode = kCCModeCBC;
	    break;
	}

	ret = CCCryptorCreateWithMode(op, mode, alg, ccNoPadding,
				      iv, key, keylen, NULL, 0, 0,
				      options, ref);
	if (ret)
	    return 0;
    }

    return 1;
}

static int
cc_des_ede3_cbc_init(EVP_CIPHER_CTX *ctx,
		     const unsigned char * key,
		     const unsigned char * iv,
		     int encp)
{
    struct cc_key *cc = ctx->cipher_data;
    return init_cc_key(encp, ctx->cipher->flags, kCCAlgorithm3DES,
		       key, kCCKeySize3DES, iv, &cc->href);
}

#endif /* HAVE_COMMONCRYPTO_COMMONCRYPTOR_H */

/**
 * The triple DES cipher type (Apple CommonCrypto provider)
 *
 * @return the DES-EDE3-CBC EVP_CIPHER pointer.
 *
 * @ingroup hcrypto_evp
 */

const EVP_CIPHER *
EVP_cc_des_ede3_cbc(void)
{
#ifdef HAVE_COMMONCRYPTO_COMMONCRYPTOR_H
    static const EVP_CIPHER des_ede3_cbc = {
	0,
	8,
	24,
	8,
	EVP_CIPH_CBC_MODE|EVP_CIPH_ALWAYS_CALL_INIT,
	cc_des_ede3_cbc_init,
	cc_do_cipher,
	cc_cleanup,
	sizeof(struct cc_key),
	NULL,
	NULL,
	NULL,
	NULL
    };
    return &des_ede3_cbc;
#elif HCRYPTO_FALLBACK
    return EVP_hcrypto_des_ede3_cbc();
#else
    return NULL;
#endif
}

#ifdef HAVE_COMMONCRYPTO_COMMONCRYPTOR_H
/*
 *
 */

static int
cc_des_cbc_init(EVP_CIPHER_CTX *ctx,
		const unsigned char * key,
		const unsigned char * iv,
		int encp)
{
    struct cc_key *cc = ctx->cipher_data;
    return init_cc_key(encp, ctx->cipher->flags, kCCAlgorithmDES,
		       key, kCCBlockSizeDES, iv, &cc->href);
}
#endif

/**
 * The DES cipher type (Apple CommonCrypto provider)
 *
 * @return the DES-CBC EVP_CIPHER pointer.
 *
 * @ingroup hcrypto_evp
 */

const EVP_CIPHER *
EVP_cc_des_cbc(void)
{
#ifdef HAVE_COMMONCRYPTO_COMMONCRYPTOR_H
    static const EVP_CIPHER des_ede3_cbc = {
	0,
	kCCBlockSizeDES,
	kCCBlockSizeDES,
	kCCBlockSizeDES,
	EVP_CIPH_CBC_MODE|EVP_CIPH_ALWAYS_CALL_INIT,
	cc_des_cbc_init,
	cc_do_cipher,
	cc_cleanup,
	sizeof(struct cc_key),
	NULL,
	NULL,
	NULL,
	NULL
    };
    return &des_ede3_cbc;
#elif HCRYPTO_FALLBACK
    return EVP_hcrypto_des_cbc();
#else
    return NULL;
#endif
}

#ifdef HAVE_COMMONCRYPTO_COMMONCRYPTOR_H
/*
 *
 */

static int
cc_aes_cbc_init(EVP_CIPHER_CTX *ctx,
		const unsigned char * key,
		const unsigned char * iv,
		int encp)
{
    struct cc_key *cc = ctx->cipher_data;
    return init_cc_key(encp, ctx->cipher->flags, kCCAlgorithmAES128,
		       key, ctx->cipher->key_len, iv, &cc->href);
}
#endif

/**
 * The AES-128 cipher type (Apple CommonCrypto provider)
 *
 * @return the AES-128-CBC EVP_CIPHER pointer.
 *
 * @ingroup hcrypto_evp
 */

const EVP_CIPHER *
EVP_cc_aes_128_cbc(void)
{
#ifdef HAVE_COMMONCRYPTO_COMMONCRYPTOR_H
    static const EVP_CIPHER c = {
	0,
	kCCBlockSizeAES128,
	kCCKeySizeAES128,
	kCCBlockSizeAES128,
	EVP_CIPH_CBC_MODE|EVP_CIPH_ALWAYS_CALL_INIT,
	cc_aes_cbc_init,
	cc_do_cipher,
	cc_cleanup,
	sizeof(struct cc_key),
	NULL,
	NULL,
	NULL,
	NULL
    };
    return &c;
#elif HCRYPTO_FALLBACK
    return EVP_hcrypto_aes_128_cbc();
#else
    return NULL;
#endif
}

/**
 * The AES-192 cipher type (Apple CommonCrypto provider)
 *
 * @return the AES-192-CBC EVP_CIPHER pointer.
 *
 * @ingroup hcrypto_evp
 */

const EVP_CIPHER *
EVP_cc_aes_192_cbc(void)
{
#ifdef HAVE_COMMONCRYPTO_COMMONCRYPTOR_H
    static const EVP_CIPHER c = {
	0,
	kCCBlockSizeAES128,
	kCCKeySizeAES192,
	kCCBlockSizeAES128,
	EVP_CIPH_CBC_MODE|EVP_CIPH_ALWAYS_CALL_INIT,
	cc_aes_cbc_init,
	cc_do_cipher,
	cc_cleanup,
	sizeof(struct cc_key),
	NULL,
	NULL,
	NULL,
	NULL
    };
    return &c;
#elif HCRYPTO_FALLBACK
    return EVP_hcrypto_aes_192_cbc();
#else
    return NULL;
#endif
}

/**
 * The AES-256 cipher type (Apple CommonCrypto provider)
 *
 * @return the AES-256-CBC EVP_CIPHER pointer.
 *
 * @ingroup hcrypto_evp
 */

const EVP_CIPHER *
EVP_cc_aes_256_cbc(void)
{
#ifdef HAVE_COMMONCRYPTO_COMMONCRYPTOR_H
    static const EVP_CIPHER c = {
	0,
	kCCBlockSizeAES128,
	kCCKeySizeAES256,
	kCCBlockSizeAES128,
	EVP_CIPH_CBC_MODE|EVP_CIPH_ALWAYS_CALL_INIT,
	cc_aes_cbc_init,
	cc_do_cipher,
	cc_cleanup,
	sizeof(struct cc_key),
	NULL,
	NULL,
	NULL,
	NULL
    };
    return &c;
#elif HCRYPTO_FALLBACK
    return EVP_hcrypto_aes_256_cbc();
#else
    return NULL;
#endif
}

#ifdef HAVE_COMMONCRYPTO_COMMONCRYPTOR_H
/*
 *
 */

static int
cc_aes_cfb8_init(EVP_CIPHER_CTX *ctx,
		const unsigned char * key,
		const unsigned char * iv,
		int encp)
{
    struct cc_key *cc = ctx->cipher_data;
    return init_cc_key(encp, ctx->cipher->flags, kCCAlgorithmAES128,
		       key, ctx->cipher->key_len, NULL, &cc->href);
}
#endif

/**
 * The AES-128 CFB8 cipher type (Apple CommonCrypto provider)
 *
 * @return the AES-128-CFB8 EVP_CIPHER pointer.
 *
 * @ingroup hcrypto_evp
 */

const EVP_CIPHER *
EVP_cc_aes_128_cfb8(void)
{
#ifdef HAVE_COMMONCRYPTO_COMMONCRYPTOR_H
    static const EVP_CIPHER c = {
	0,
	1,
	kCCKeySizeAES128,
	kCCBlockSizeAES128,
	EVP_CIPH_CFB8_MODE|EVP_CIPH_ALWAYS_CALL_INIT,
	cc_aes_cfb8_init,
	cc_do_cipher,
	cc_cleanup,
	sizeof(struct cc_key),
	NULL,
	NULL,
	NULL,
	NULL
    };
    return &c;
#elif HCRYPTO_FALLBACK
    return EVP_hcrypto_aes_128_cfb8();
#else
    return NULL;
#endif
}

/**
 * The AES-192 CFB8 cipher type (Apple CommonCrypto provider)
 *
 * @return the AES-192-CFB8 EVP_CIPHER pointer.
 *
 * @ingroup hcrypto_evp
 */

const EVP_CIPHER *
EVP_cc_aes_192_cfb8(void)
{
#ifdef HAVE_COMMONCRYPTO_COMMONCRYPTOR_H
    static const EVP_CIPHER c = {
	0,
	1,
	kCCKeySizeAES192,
	kCCBlockSizeAES128,
	EVP_CIPH_CFB8_MODE|EVP_CIPH_ALWAYS_CALL_INIT,
	cc_aes_cfb8_init,
	cc_do_cipher,
	cc_cleanup,
	sizeof(struct cc_key),
	NULL,
	NULL,
	NULL,
	NULL
    };
    return &c;
#elif HCRYPTO_FALLBACK
    return EVP_hcrypto_aes_192_cfb8();
#else
    return NULL;
#endif
}

/**
 * The AES-256 CFB8 cipher type (Apple CommonCrypto provider)
 *
 * @return the AES-256-CFB8 EVP_CIPHER pointer.
 *
 * @ingroup hcrypto_evp
 */

const EVP_CIPHER *
EVP_cc_aes_256_cfb8(void)
{
#ifdef HAVE_COMMONCRYPTO_COMMONCRYPTOR_H
    static const EVP_CIPHER c = {
	0,
	kCCBlockSizeAES128,
	kCCKeySizeAES256,
	kCCBlockSizeAES128,
	EVP_CIPH_CFB8_MODE|EVP_CIPH_ALWAYS_CALL_INIT,
	cc_aes_cfb8_init,
	cc_do_cipher,
	cc_cleanup,
	sizeof(struct cc_key),
	NULL,
	NULL,
	NULL,
	NULL
    };
    return &c;
#elif HCRYPTO_FALLBACK
    return EVP_hcrypto_aes_256_cfb8();
#else
    return NULL;
#endif
}

/*
 *
 */

#ifdef COMMONCRYPTO_SUPPORTS_RC2
static int
cc_rc2_cbc_init(EVP_CIPHER_CTX *ctx,
		const unsigned char * key,
		const unsigned char * iv,
		int encp)
{
    struct cc_key *cc = ctx->cipher_data;
    return init_cc_key(encp, ctx->cipher->flags, kCCAlgorithmRC2,
		       key, ctx->cipher->key_len, iv, &cc->href);
}
#endif

/**
 * The RC2 cipher type - common crypto
 *
 * @return the RC2 EVP_CIPHER pointer.
 *
 * @ingroup hcrypto_evp
 */


const EVP_CIPHER *
EVP_cc_rc2_cbc(void)
{
#ifdef COMMONCRYPTO_SUPPORTS_RC2
    static const EVP_CIPHER rc2_cbc = {
	0,
	kCCBlockSizeRC2,
	16,
	kCCBlockSizeRC2,
	EVP_CIPH_CBC_MODE|EVP_CIPH_ALWAYS_CALL_INIT,
	cc_rc2_cbc_init,
	cc_do_cipher,
	cc_cleanup,
	sizeof(struct cc_key),
	NULL,
	NULL,
	NULL,
	NULL
    };
    return &rc2_cbc;
#elif HCRYPTO_FALLBACK
    return EVP_hcrypto_rc2_cbc();
#else
    return NULL;
#endif
}

/**
 * The RC2-40 cipher type - common crypto
 *
 * @return the RC2-40 EVP_CIPHER pointer.
 *
 * @ingroup hcrypto_evp
 */


const EVP_CIPHER *
EVP_cc_rc2_40_cbc(void)
{
#ifdef COMMONCRYPTO_SUPPORTS_RC2
    static const EVP_CIPHER rc2_40_cbc = {
	0,
	kCCBlockSizeRC2,
	5,
	kCCBlockSizeRC2,
	EVP_CIPH_CBC_MODE|EVP_CIPH_ALWAYS_CALL_INIT,
	cc_rc2_cbc_init,
	cc_do_cipher,
	cc_cleanup,
	sizeof(struct cc_key),
	NULL,
	NULL,
	NULL,
	NULL
    };
    return &rc2_40_cbc;
#elif HCRYPTO_FALLBACK
    return EVP_hcrypto_rc2_40_cbc();
#else
    return NULL;
#endif
}


/**
 * The RC2-64 cipher type - common crypto
 *
 * @return the RC2-64 EVP_CIPHER pointer.
 *
 * @ingroup hcrypto_evp
 */


const EVP_CIPHER *
EVP_cc_rc2_64_cbc(void)
{
#ifdef COMMONCRYPTO_SUPPORTS_RC2
    static const EVP_CIPHER rc2_64_cbc = {
	0,
	kCCBlockSizeRC2,
	8,
	kCCBlockSizeRC2,
	EVP_CIPH_CBC_MODE|EVP_CIPH_ALWAYS_CALL_INIT,
	cc_rc2_cbc_init,
	cc_do_cipher,
	cc_cleanup,
	sizeof(struct cc_key),
	NULL,
	NULL,
	NULL,
	NULL
    };
    return &rc2_64_cbc;
#elif HCRYPTO_FALLBACK
    return EVP_hcrypto_rc2_64_cbc();
#else
    return NULL;
#endif
}


/**
 * The CommonCrypto md4 provider
 *
 * @ingroup hcrypto_evp
 */

const EVP_MD *
EVP_cc_md4(void)
{
#ifdef HAVE_COMMONCRYPTO_COMMONDIGEST_H
    static const struct hc_evp_md md4 = {
	CC_MD4_DIGEST_LENGTH,
	CC_MD4_BLOCK_BYTES,
	sizeof(CC_MD4_CTX),
	(hc_evp_md_init)CC_MD4_Init,
	(hc_evp_md_update)CC_MD4_Update,
	(hc_evp_md_final)CC_MD4_Final,
	(hc_evp_md_cleanup)NULL
    };
    return &md4;
#elif HCRYPTO_FALLBACK
    return EVP_hcrypto_md4();
#else
    return NULL;
#endif
}

/**
 * The CommonCrypto md5 provider
 *
 * @ingroup hcrypto_evp
 */

const EVP_MD *
EVP_cc_md5(void)
{
#ifdef HAVE_COMMONCRYPTO_COMMONDIGEST_H
    static const struct hc_evp_md md5 = {
	CC_MD5_DIGEST_LENGTH,
	CC_MD5_BLOCK_BYTES,
	sizeof(CC_MD5_CTX),
	(hc_evp_md_init)CC_MD5_Init,
	(hc_evp_md_update)CC_MD5_Update,
	(hc_evp_md_final)CC_MD5_Final,
	(hc_evp_md_cleanup)NULL
    };
    return &md5;
#elif HCRYPTO_FALLBACK
    return EVP_hcrypto_md5();
#else
    return NULL;
#endif
}

/**
 * The CommonCrypto sha1 provider
 *
 * @ingroup hcrypto_evp
 */

const EVP_MD *
EVP_cc_sha1(void)
{
#ifdef HAVE_COMMONCRYPTO_COMMONDIGEST_H
    static const struct hc_evp_md sha1 = {
	CC_SHA1_DIGEST_LENGTH,
	CC_SHA1_BLOCK_BYTES,
	sizeof(CC_SHA1_CTX),
	(hc_evp_md_init)CC_SHA1_Init,
	(hc_evp_md_update)CC_SHA1_Update,
	(hc_evp_md_final)CC_SHA1_Final,
	(hc_evp_md_cleanup)NULL
    };
    return &sha1;
#elif HCRYPTO_FALLBACK
    return EVP_hcrypto_sha1();
#else
    return NULL;
#endif
}

/**
 * The CommonCrypto sha256 provider
 *
 * @ingroup hcrypto_evp
 */

const EVP_MD *
EVP_cc_sha256(void)
{
#ifdef HAVE_COMMONCRYPTO_COMMONDIGEST_H
    static const struct hc_evp_md sha256 = {
	CC_SHA256_DIGEST_LENGTH,
	CC_SHA256_BLOCK_BYTES,
	sizeof(CC_SHA256_CTX),
	(hc_evp_md_init)CC_SHA256_Init,
	(hc_evp_md_update)CC_SHA256_Update,
	(hc_evp_md_final)CC_SHA256_Final,
	(hc_evp_md_cleanup)NULL
    };
    return &sha256;
#elif HCRYPTO_FALLBACK
    return EVP_hcrypto_sha256();
#else
    return NULL;
#endif
}

/**
 * The CommonCrypto sha384 provider
 *
 * @ingroup hcrypto_evp
 */

const EVP_MD *
EVP_cc_sha384(void)
{
#ifdef HAVE_COMMONCRYPTO_COMMONDIGEST_H
    static const struct hc_evp_md sha384 = {
	CC_SHA384_DIGEST_LENGTH,
	CC_SHA384_BLOCK_BYTES,
	sizeof(CC_SHA512_CTX),
	(hc_evp_md_init)CC_SHA384_Init,
	(hc_evp_md_update)CC_SHA384_Update,
	(hc_evp_md_final)CC_SHA384_Final,
	(hc_evp_md_cleanup)NULL
    };
    return &sha384;
#elif HCRYPTO_FALLBACK
    return EVP_hcrypto_sha384();
#else
    return NULL;
#endif
}

/**
 * The CommonCrypto sha512 provider
 *
 * @ingroup hcrypto_evp
 */

const EVP_MD *
EVP_cc_sha512(void)
{
#ifdef HAVE_COMMONCRYPTO_COMMONDIGEST_H
    static const struct hc_evp_md sha512 = {
	CC_SHA512_DIGEST_LENGTH,
	CC_SHA512_BLOCK_BYTES,
	sizeof(CC_SHA512_CTX),
	(hc_evp_md_init)CC_SHA512_Init,
	(hc_evp_md_update)CC_SHA512_Update,
	(hc_evp_md_final)CC_SHA512_Final,
	(hc_evp_md_cleanup)NULL
    };
    return &sha512;
#elif HCRYPTO_FALLBACK
    return EVP_hcrypto_sha512();
#else
    return NULL;
#endif
}

/**
 * The Camellia-128 cipher type - CommonCrypto
 *
 * @return the Camellia-128 EVP_CIPHER pointer.
 *
 * @ingroup hcrypto_evp
 */

const EVP_CIPHER *
EVP_cc_camellia_128_cbc(void)
{
#if HCRYPTO_FALLBACK
    return EVP_hcrypto_camellia_128_cbc();
#else
    return NULL;
#endif
}

/**
 * The Camellia-198 cipher type - CommonCrypto
 *
 * @return the Camellia-198 EVP_CIPHER pointer.
 *
 * @ingroup hcrypto_evp
 */

const EVP_CIPHER *
EVP_cc_camellia_192_cbc(void)
{
#if HCRYPTO_FALLBACK
    return EVP_hcrypto_camellia_192_cbc();
#else
    return NULL;
#endif
}

/**
 * The Camellia-256 cipher type - CommonCrypto
 *
 * @return the Camellia-256 EVP_CIPHER pointer.
 *
 * @ingroup hcrypto_evp
 */

const EVP_CIPHER *
EVP_cc_camellia_256_cbc(void)
{
#if HCRYPTO_FALLBACK
    return EVP_hcrypto_camellia_256_cbc();
#else
    return NULL;
#endif
}

#ifdef HAVE_COMMONCRYPTO_COMMONCRYPTOR_H

/*
 *
 */

static int
cc_rc4_init(EVP_CIPHER_CTX *ctx,
	    const unsigned char * key,
	    const unsigned char * iv,
	    int encp)
{
    struct cc_key *cc = ctx->cipher_data;
    return init_cc_key(encp, ctx->cipher->flags, kCCAlgorithmRC4,
		       key, ctx->key_len, iv, &cc->href);
}

#endif

/**

 * The RC4 cipher type (Apple CommonCrypto provider)
 *
 * @return the RC4 EVP_CIPHER pointer.
 *
 * @ingroup hcrypto_evp
 */

const EVP_CIPHER *
EVP_cc_rc4(void)
{
#ifdef HAVE_COMMONCRYPTO_COMMONCRYPTOR_H
    static const EVP_CIPHER rc4 = {
	0,
	1,
	16,
	0,
	EVP_CIPH_STREAM_CIPHER|EVP_CIPH_VARIABLE_LENGTH,
	cc_rc4_init,
	cc_do_cipher,
	cc_cleanup,
	sizeof(struct cc_key),
	NULL,
	NULL,
	NULL,
	NULL
    };
    return &rc4;
#elif HCRYPTO_FALLBACK
    return EVP_hcrypto_rc4();
#else
    return NULL;
#endif
}


/**
 * The RC4-40 cipher type (Apple CommonCrypto provider)
 *
 * @return the RC4 EVP_CIPHER pointer.
 *
 * @ingroup hcrypto_evp
 */

const EVP_CIPHER *
EVP_cc_rc4_40(void)
{
#ifdef HAVE_COMMONCRYPTO_COMMONCRYPTOR_H
    static const EVP_CIPHER rc4_40 = {
	0,
	1,
	5,
	0,
	EVP_CIPH_STREAM_CIPHER|EVP_CIPH_VARIABLE_LENGTH,
	cc_rc4_init,
	cc_do_cipher,
	cc_cleanup,
	sizeof(struct cc_key),
	NULL,
	NULL,
	NULL,
	NULL
    };
    return &rc4_40;
#elif HCRYPTO_FALLBACK
    return EVP_hcrypto_rc4_40();
#else
    return NULL;
#endif
}

#endif /* __APPLE__ */