corecrypto_des.c   [plain text]

/*
 * Copyright (c) 2012 Apple Computer, Inc. All rights reserved.
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 * This file contains Original Code and/or Modifications of Original Code
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 * may not be used to create, or enable the creation or redistribution of,
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 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 *
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 *
 * The Original Code and all software distributed under the License are
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#include <libkern/crypto/crypto_internal.h>
#include <libkern/libkern.h>
#include <kern/debug.h>
#include <libkern/crypto/des.h>
#include <corecrypto/ccmode.h>

/* Single DES ECB - used by ipv6 (esp_core.c) */
int
des_ecb_key_sched(des_cblock *key, des_ecb_key_schedule *ks)
{
	const struct ccmode_ecb *enc = g_crypto_funcs->ccdes_ecb_encrypt;
	const struct ccmode_ecb *dec = g_crypto_funcs->ccdes_ecb_decrypt;

	/* Make sure the context size for the mode fits in the one we have */
	if ((enc->size > sizeof(ks->enc)) || (dec->size > sizeof(ks->dec))) {
		panic("%s: inconsistent size for DES-ECB context", __FUNCTION__);
	}

	int rc = enc->init(enc, ks->enc, CCDES_KEY_SIZE, key);
	if (rc) {
		return rc;
	}

	return dec->init(dec, ks->dec, CCDES_KEY_SIZE, key);
}

/* Simple des - 1 block */
int
des_ecb_encrypt(des_cblock *in, des_cblock *out, des_ecb_key_schedule *ks, int enc)
{
	const struct ccmode_ecb *ecb = enc ? g_crypto_funcs->ccdes_ecb_encrypt : g_crypto_funcs->ccdes_ecb_decrypt;
	ccecb_ctx *ctx = enc ? ks->enc : ks->dec;

	return ecb->ecb(ctx, 1, in, out);
}


/* Triple DES ECB - used by ipv6 (esp_core.c) */
int
des3_ecb_key_sched(des_cblock *key, des3_ecb_key_schedule *ks)
{
	const struct ccmode_ecb *enc = g_crypto_funcs->cctdes_ecb_encrypt;
	const struct ccmode_ecb *dec = g_crypto_funcs->cctdes_ecb_decrypt;

	/* Make sure the context size for the mode fits in the one we have */
	if ((enc->size > sizeof(ks->enc)) || (dec->size > sizeof(ks->dec))) {
		panic("%s: inconsistent size for 3DES-ECB context", __FUNCTION__);
	}

	int rc = enc->init(enc, ks->enc, CCDES_KEY_SIZE * 3, key);
	if (rc) {
		return rc;
	}

	return dec->init(dec, ks->dec, CCDES_KEY_SIZE * 3, key);
}

/* Simple des - 1 block */
int
des3_ecb_encrypt(des_cblock *in, des_cblock *out, des3_ecb_key_schedule *ks, int enc)
{
	const struct ccmode_ecb *ecb = enc ? g_crypto_funcs->cctdes_ecb_encrypt : g_crypto_funcs->cctdes_ecb_decrypt;
	ccecb_ctx *ctx = enc ? ks->enc : ks->dec;

	return ecb->ecb(ctx, 1, in, out);
}

/* Raw key helper functions */

int
des_is_weak_key(des_cblock *key)
{
	return g_crypto_funcs->ccdes_key_is_weak_fn(key, CCDES_KEY_SIZE);
}