openssl/crypto/evp/e_aes.c

/* ====================================================================
 * Copyright (c) 2001-2011 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
 *    openssl-core@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.
 * ====================================================================
 *
 */

#define OPENSSL_FIPSAPI

#include <openssl/opensslconf.h>
#ifndef OPENSSL_NO_AES
#include <openssl/evp.h>
#include <openssl/err.h>
#include <string.h>
#include <assert.h>
#include <openssl/aes.h>
#include "evp_locl.h"
#include "modes_lcl.h"
#include <openssl/rand.h>

typedef struct
	{
	AES_KEY ks;
	} EVP_AES_KEY;

typedef struct
	{
	AES_KEY ks;		/* AES key schedule to use */
	int key_set;		/* Set if key initialised */
	int iv_set;		/* Set if an iv is set */
	GCM128_CONTEXT gcm;
	unsigned char *iv;	/* Temporary IV store */
	int ivlen;		/* IV length */
	int taglen;
	int iv_gen;		/* It is OK to generate IVs */
	int tls_aad_len;	/* TLS AAD length */
	} EVP_AES_GCM_CTX;

typedef struct
	{
	AES_KEY ks1, ks2;	/* AES key schedules to use */
	XTS128_CONTEXT xts;
	} EVP_AES_XTS_CTX;

typedef struct
	{
	AES_KEY ks;		/* AES key schedule to use */
	int key_set;		/* Set if key initialised */
	int iv_set;		/* Set if an iv is set */
	int tag_set;		/* Set if tag is valid */
	int len_set;		/* Set if message length set */
	int L, M;		/* L and M parameters from RFC3610 */
	CCM128_CONTEXT ccm;
	} EVP_AES_CCM_CTX;

#define MAXBITCHUNK	((size_t)1<<(sizeof(size_t)*8-4))

#if	defined(AES_ASM) && !defined(I386_ONLY) &&	(  \
	((defined(__i386)	|| defined(__i386__)	|| \
	  defined(_M_IX86)) && defined(OPENSSL_IA32_SSE2))|| \
	defined(__x86_64)	|| defined(__x86_64__)	|| \
	defined(_M_AMD64)	|| defined(_M_X64)	|| \
	defined(__INTEL__)				)
/*
 * AES-NI section
 */
extern unsigned int OPENSSL_ia32cap_P[2];
#define	AESNI_CAPABLE	(1<<(57-32))

int aesni_set_encrypt_key(const unsigned char *userKey, int bits,
			AES_KEY *key);
int aesni_set_decrypt_key(const unsigned char *userKey, int bits,
			AES_KEY *key);

void aesni_encrypt(const unsigned char *in, unsigned char *out,
			const AES_KEY *key);
void aesni_decrypt(const unsigned char *in, unsigned char *out,
			const AES_KEY *key);

void aesni_ecb_encrypt(const unsigned char *in,
			unsigned char *out,
			size_t length,
			const AES_KEY *key,
			int enc);
void aesni_cbc_encrypt(const unsigned char *in,
			unsigned char *out,
			size_t length,
			const AES_KEY *key,
			unsigned char *ivec, int enc);

void aesni_ctr32_encrypt_blocks(const unsigned char *in,
			unsigned char *out,
			size_t blocks,
			const void *key,
			const unsigned char *ivec);

void aesni_xts_encrypt(const unsigned char *in,
			unsigned char *out,
			size_t length,
			const AES_KEY *key1, const AES_KEY *key2,
			const unsigned char iv[16]);

void aesni_xts_decrypt(const unsigned char *in,
			unsigned char *out,
			size_t length,
			const AES_KEY *key1, const AES_KEY *key2,
			const unsigned char iv[16]);

void aesni_ccm64_encrypt_blocks (const unsigned char *in,
			unsigned char *out,
			size_t blocks,
			const void *key,
			const unsigned char ivec[16],
			unsigned char cmac[16]);

void aesni_ccm64_decrypt_blocks (const unsigned char *in,
			unsigned char *out,
			size_t blocks,
			const void *key,
			const unsigned char ivec[16],
			unsigned char cmac[16]);

static int aesni_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
		   const unsigned char *iv, int enc)
	{
	int ret;

	if (((ctx->cipher->flags & EVP_CIPH_MODE) == EVP_CIPH_ECB_MODE
	    || (ctx->cipher->flags & EVP_CIPH_MODE) == EVP_CIPH_CBC_MODE)
	    && !enc) 
		ret = aesni_set_decrypt_key(key, ctx->key_len*8, ctx->cipher_data);
	else
		ret = aesni_set_encrypt_key(key, ctx->key_len*8, ctx->cipher_data);

	if(ret < 0)
		{
		EVPerr(EVP_F_AES_INIT_KEY,EVP_R_AES_KEY_SETUP_FAILED);
		return 0;
		}

	return 1;
	}

static int aesni_cbc_cipher(EVP_CIPHER_CTX *ctx,unsigned char *out,
	const unsigned char *in, size_t len)
{
	aesni_cbc_encrypt(in,out,len,ctx->cipher_data,ctx->iv,ctx->encrypt);

	return 1;
}

static int aesni_ecb_cipher(EVP_CIPHER_CTX *ctx,unsigned char *out,
	const unsigned char *in, size_t len)
{
	size_t	bl = ctx->cipher->block_size;

	if (len<bl)	return 1;

	aesni_ecb_encrypt(in,out,len,ctx->cipher_data,ctx->encrypt);

	return 1;
}

static int aesni_ofb_cipher(EVP_CIPHER_CTX *ctx,unsigned char *out,
	const unsigned char *in,size_t len)
{
	CRYPTO_ofb128_encrypt(in,out,len,ctx->cipher_data,
			ctx->iv,&ctx->num,
			(block128_f)aesni_encrypt);
	return 1;
}

static int aesni_cfb_cipher(EVP_CIPHER_CTX *ctx,unsigned char *out,
	const unsigned char *in,size_t len)
{
	CRYPTO_cfb128_encrypt(in,out,len,ctx->cipher_data,
			ctx->iv,&ctx->num,ctx->encrypt,
			(block128_f)aesni_encrypt);
	return 1;
}

static int aesni_cfb8_cipher(EVP_CIPHER_CTX *ctx,unsigned char *out,
	const unsigned char *in,size_t len)
{
	CRYPTO_cfb128_8_encrypt(in,out,len,ctx->cipher_data,
			ctx->iv,&ctx->num,ctx->encrypt,
			(block128_f)aesni_encrypt);
	return 1;
}

static int aesni_cfb1_cipher(EVP_CIPHER_CTX *ctx,unsigned char *out,
	const unsigned char *in,size_t len)
{
	if (ctx->flags&EVP_CIPH_FLAG_LENGTH_BITS) {
		CRYPTO_cfb128_1_encrypt(in,out,len,ctx->cipher_data,
			ctx->iv,&ctx->num,ctx->encrypt,
			(block128_f)aesni_encrypt);
		return 1;
	}

	while (len>=MAXBITCHUNK) {
		CRYPTO_cfb128_1_encrypt(in,out,MAXBITCHUNK*8,ctx->cipher_data,
			ctx->iv,&ctx->num,ctx->encrypt,
			(block128_f)aesni_encrypt);
		len-=MAXBITCHUNK;
	}
	if (len)
		CRYPTO_cfb128_1_encrypt(in,out,len*8,ctx->cipher_data,
			ctx->iv,&ctx->num,ctx->encrypt,
			(block128_f)aesni_encrypt);
	
	return 1;
}

static int aesni_ctr_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
		const unsigned char *in, size_t len)
{
	unsigned int num;
	num = ctx->num;

	CRYPTO_ctr128_encrypt_ctr32(in,out,len,
			ctx->cipher_data,ctx->iv,ctx->buf,&num,
			(ctr128_f)aesni_ctr32_encrypt_blocks);

	ctx->num = (size_t)num;
	return 1;
}

static int aesni_gcm_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
                        const unsigned char *iv, int enc)
	{
	EVP_AES_GCM_CTX *gctx = ctx->cipher_data;
	if (!iv && !key)
		return 1;
	if (key)
		{
		aesni_set_encrypt_key(key, ctx->key_len * 8, &gctx->ks);
		CRYPTO_gcm128_init(&gctx->gcm, &gctx->ks,
				(block128_f)aesni_encrypt);
		/* If we have an iv can set it directly, otherwise use
		 * saved IV.
		 */
		if (iv == NULL && gctx->iv_set)
			iv = gctx->iv;
		if (iv)
			{
			CRYPTO_gcm128_setiv(&gctx->gcm, iv, gctx->ivlen);
			gctx->iv_set = 1;
			}
		gctx->key_set = 1;
		}
	else
		{
		/* If key set use IV, otherwise copy */
		if (gctx->key_set)
			CRYPTO_gcm128_setiv(&gctx->gcm, iv, gctx->ivlen);
		else
			memcpy(gctx->iv, iv, gctx->ivlen);
		gctx->iv_set = 1;
		gctx->iv_gen = 0;
		}
	return 1;
	}

static int aesni_gcm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
		const unsigned char *in, size_t len)
	{
	EVP_AES_GCM_CTX *gctx = ctx->cipher_data;
	/* If not set up, return error */
	if (!gctx->iv_set && !gctx->key_set)
		return -1;
	if (!ctx->encrypt && gctx->taglen < 0)
		return -1;
	if (in)
		{
		if (out == NULL)
			{
			if (CRYPTO_gcm128_aad(&gctx->gcm, in, len))
				return -1;
			}
		else if (ctx->encrypt)
			{
			if (CRYPTO_gcm128_encrypt_ctr32(&gctx->gcm,
					in, out, len,
					aesni_ctr32_encrypt_blocks))
				return -1;
			}
		else
			{
			if (CRYPTO_gcm128_decrypt_ctr32(&gctx->gcm,
					in, out, len,
					aesni_ctr32_encrypt_blocks))
				return -1;
			}
		return len;
		}
	else
		{
		if (!ctx->encrypt)
			{
			if (CRYPTO_gcm128_finish(&gctx->gcm,
					ctx->buf, gctx->taglen) != 0)
				return -1;
			gctx->iv_set = 0;
			return 0;
			}
		CRYPTO_gcm128_tag(&gctx->gcm, ctx->buf, 16);
		gctx->taglen = 16;
		/* Don't reuse the IV */
		gctx->iv_set = 0;
		return 0;
		}

	}

static int aesni_xts_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
                        const unsigned char *iv, int enc)
	{
	EVP_AES_XTS_CTX *xctx = ctx->cipher_data;
	if (!iv && !key)
		return 1;

	if (key)
		{
		/* key_len is two AES keys */
		if (enc)
			{
			aesni_set_encrypt_key(key, ctx->key_len * 4, &xctx->ks1);
			xctx->xts.block1 = (block128_f)aesni_encrypt;
			}
		else
			{
			aesni_set_decrypt_key(key, ctx->key_len * 4, &xctx->ks1);
			xctx->xts.block1 = (block128_f)aesni_decrypt;
			}

		aesni_set_encrypt_key(key + ctx->key_len/2,
						ctx->key_len * 4, &xctx->ks2);
		xctx->xts.block2 = (block128_f)aesni_encrypt;

		xctx->xts.key1 = &xctx->ks1;
		}

	if (iv)
		{
		xctx->xts.key2 = &xctx->ks2;
		memcpy(ctx->iv, iv, 16);
		}

	return 1;
	}

static int aesni_xts_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
		const unsigned char *in, size_t len)
	{
	EVP_AES_XTS_CTX *xctx = ctx->cipher_data;
	if (!xctx->xts.key1 || !xctx->xts.key2)
		return -1;
	if (!out || !in)
		return -1;
#ifdef OPENSSL_FIPS
	/* Requirement of SP800-38E */
	if (FIPS_module_mode() && !(ctx->flags & EVP_CIPH_FLAG_NON_FIPS_ALLOW) &&
			(len > (1L<<20)*16))
		{
		EVPerr(EVP_F_AES_XTS, EVP_R_TOO_LARGE);
		return -1;
		}
#endif
	if (ctx->encrypt)
		aesni_xts_encrypt(in, out, len,
			xctx->xts.key1, xctx->xts.key2, ctx->iv);
	else
		aesni_xts_decrypt(in, out, len,
			xctx->xts.key1, xctx->xts.key2, ctx->iv);

	return len;
	}

static int aesni_ccm_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
                        const unsigned char *iv, int enc)
	{
	EVP_AES_CCM_CTX *cctx = ctx->cipher_data;
	if (!iv && !key)
		return 1;
	if (key)
		{
		aesni_set_encrypt_key(key, ctx->key_len * 8, &cctx->ks);
		CRYPTO_ccm128_init(&cctx->ccm, cctx->M, cctx->L,
					&cctx->ks, (block128_f)aesni_encrypt);
		cctx->key_set = 1;
		}
	if (iv)
		{
		memcpy(ctx->iv, iv, 15 - cctx->L);
		cctx->iv_set = 1;
		}
	return 1;
	}

static int aesni_ccm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
		const unsigned char *in, size_t len)
	{
	EVP_AES_CCM_CTX *cctx = ctx->cipher_data;
	CCM128_CONTEXT *ccm = &cctx->ccm;
	/* If not set up, return error */
	if (!cctx->iv_set && !cctx->key_set)
		return -1;
	if (!ctx->encrypt && !cctx->tag_set)
		return -1;
	if (!out)
		{
		if (!in)
			{
			if (CRYPTO_ccm128_setiv(ccm, ctx->iv, 15 - cctx->L,len))
				return -1;
			cctx->len_set = 1;
			return len;
			}
		/* If have AAD need message length */
		if (!cctx->len_set && len)
			return -1;
		CRYPTO_ccm128_aad(ccm, in, len);
		return len;
		}
	/* EVP_*Final() doesn't return any data */
	if (!in)
		return 0;
	/* If not set length yet do it */
	if (!cctx->len_set)
		{
		if (CRYPTO_ccm128_setiv(ccm, ctx->iv, 15 - cctx->L, len))
			return -1;
		cctx->len_set = 1;
		}
	if (ctx->encrypt)
		{
		if (CRYPTO_ccm128_encrypt_ccm64(ccm, in, out, len,
				aesni_ccm64_encrypt_blocks))
			return -1;
		cctx->tag_set = 1;
		return len;
		}
	else
		{
		int rv = -1;
		if (!CRYPTO_ccm128_decrypt_ccm64(ccm, in, out, len,
				aesni_ccm64_decrypt_blocks))
			{
			unsigned char tag[16];
			if (CRYPTO_ccm128_tag(ccm, tag, cctx->M))
				{
				if (!memcmp(tag, ctx->buf, cctx->M))
					rv = len;
				}
			}
		if (rv == -1)
			OPENSSL_cleanse(out, len);
		cctx->iv_set = 0;
		cctx->tag_set = 0;
		cctx->len_set = 0;
		return rv;
		}

	}

#define BLOCK_CIPHER_generic(nid,keylen,blocksize,ivlen,nmode,mode,MODE,flags) \
static const EVP_CIPHER aesni_##keylen##_##mode = { \
	nid##_##keylen##_##nmode,blocksize,keylen/8,ivlen, \
	flags|EVP_CIPH_##MODE##_MODE,	\
	aesni_init_key,			\
	aesni_##mode##_cipher,		\
	NULL,				\
	sizeof(EVP_AES_KEY),		\
	NULL,NULL,NULL,NULL }; \
static const EVP_CIPHER aes_##keylen##_##mode = { \
	nid##_##keylen##_##nmode,blocksize,	\
	keylen/8,ivlen, \
	flags|EVP_CIPH_##MODE##_MODE,	\
	aes_init_key,			\
	aes_##mode##_cipher,		\
	NULL,				\
	sizeof(EVP_AES_KEY),		\
	NULL,NULL,NULL,NULL }; \
const EVP_CIPHER *EVP_aes_##keylen##_##mode(void) \
{ return (OPENSSL_ia32cap_P[1]&AESNI_CAPABLE)? \
  &aesni_##keylen##_##mode:&aes_##keylen##_##mode; }

#define BLOCK_CIPHER_custom(nid,keylen,blocksize,ivlen,mode,MODE,flags) \
static const EVP_CIPHER aesni_##keylen##_##mode = { \
	nid##_##keylen##_##mode,blocksize, \
	(EVP_CIPH_##MODE##_MODE==EVP_CIPH_XTS_MODE?2:1)*keylen/8, ivlen, \
	flags|EVP_CIPH_##MODE##_MODE,	\
	aesni_##mode##_init_key,	\
	aesni_##mode##_cipher,		\
	aes_##mode##_cleanup,		\
	sizeof(EVP_AES_##MODE##_CTX),	\
	NULL,NULL,aes_##mode##_ctrl,NULL }; \
static const EVP_CIPHER aes_##keylen##_##mode = { \
	nid##_##keylen##_##mode,blocksize, \
	(EVP_CIPH_##MODE##_MODE==EVP_CIPH_XTS_MODE?2:1)*keylen/8, ivlen, \
	flags|EVP_CIPH_##MODE##_MODE,	\
	aes_##mode##_init_key,		\
	aes_##mode##_cipher,		\
	aes_##mode##_cleanup,		\
	sizeof(EVP_AES_##MODE##_CTX),	\
	NULL,NULL,aes_##mode##_ctrl,NULL }; \
const EVP_CIPHER *EVP_aes_##keylen##_##mode(void) \
{ return (OPENSSL_ia32cap_P[1]&AESNI_CAPABLE)? \
  &aesni_##keylen##_##mode:&aes_##keylen##_##mode; }

#else

#define BLOCK_CIPHER_generic(nid,keylen,blocksize,ivlen,nmode,mode,MODE,flags) \
static const EVP_CIPHER aes_##keylen##_##mode = { \
	nid##_##keylen##_##nmode,blocksize,keylen/8,ivlen, \
	flags|EVP_CIPH_##MODE##_MODE,	\
	aes_init_key,			\
	aes_##mode##_cipher,		\
	NULL,				\
	sizeof(EVP_AES_KEY),		\
	NULL,NULL,NULL,NULL }; \
const EVP_CIPHER *EVP_aes_##keylen##_##mode(void) \
{ return &aes_##keylen##_##mode; }

#define BLOCK_CIPHER_custom(nid,keylen,blocksize,ivlen,mode,MODE,flags) \
static const EVP_CIPHER aes_##keylen##_##mode = { \
	nid##_##keylen##_##mode,blocksize, \
	(EVP_CIPH_##MODE##_MODE==EVP_CIPH_XTS_MODE?2:1)*keylen/8, ivlen, \
	flags|EVP_CIPH_##MODE##_MODE,	\
	aes_##mode##_init_key,		\
	aes_##mode##_cipher,		\
	aes_##mode##_cleanup,		\
	sizeof(EVP_AES_##MODE##_CTX),	\
	NULL,NULL,aes_##mode##_ctrl,NULL }; \
const EVP_CIPHER *EVP_aes_##keylen##_##mode(void) \
{ return &aes_##keylen##_##mode; }
#endif

#define BLOCK_CIPHER_generic_pack(nid,keylen,flags)		\
	BLOCK_CIPHER_generic(nid,keylen,16,16,cbc,cbc,CBC,flags|EVP_CIPH_FLAG_DEFAULT_ASN1)	\
	BLOCK_CIPHER_generic(nid,keylen,16,0,ecb,ecb,ECB,flags|EVP_CIPH_FLAG_DEFAULT_ASN1)	\
	BLOCK_CIPHER_generic(nid,keylen,1,16,ofb128,ofb,OFB,flags|EVP_CIPH_FLAG_DEFAULT_ASN1)	\
	BLOCK_CIPHER_generic(nid,keylen,1,16,cfb128,cfb,CFB,flags|EVP_CIPH_FLAG_DEFAULT_ASN1)	\
	BLOCK_CIPHER_generic(nid,keylen,1,16,cfb1,cfb1,CFB,flags)	\
	BLOCK_CIPHER_generic(nid,keylen,1,16,cfb8,cfb8,CFB,flags)	\
	BLOCK_CIPHER_generic(nid,keylen,1,16,ctr,ctr,CTR,flags)

static int aes_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
		   const unsigned char *iv, int enc)
	{
	int ret;

	if (((ctx->cipher->flags & EVP_CIPH_MODE) == EVP_CIPH_ECB_MODE
	    || (ctx->cipher->flags & EVP_CIPH_MODE) == EVP_CIPH_CBC_MODE)
	    && !enc) 
		ret = AES_set_decrypt_key(key, ctx->key_len * 8, ctx->cipher_data);
	else
		ret = AES_set_encrypt_key(key, ctx->key_len * 8, ctx->cipher_data);

	if(ret < 0)
		{
		EVPerr(EVP_F_AES_INIT_KEY,EVP_R_AES_KEY_SETUP_FAILED);
		return 0;
		}

	return 1;
	}

static int aes_cbc_cipher(EVP_CIPHER_CTX *ctx,unsigned char *out,
	const unsigned char *in, size_t len)
{
	AES_cbc_encrypt(in,out,len,ctx->cipher_data,ctx->iv,ctx->encrypt);

	return 1;
}

static int aes_ecb_cipher(EVP_CIPHER_CTX *ctx,unsigned char *out,
	const unsigned char *in, size_t len)
{
	size_t	bl = ctx->cipher->block_size;
	size_t	i;

	if (len<bl)	return 1;

	if (ctx->encrypt) {
		for (i=0,len-=bl;i<=len;i+=bl)
			AES_encrypt(in+i,out+i,ctx->cipher_data);
	} else {
		for (i=0,len-=bl;i<=len;i+=bl)
			AES_decrypt(in+i,out+i,ctx->cipher_data);
	}

	return 1;
}

static int aes_ofb_cipher(EVP_CIPHER_CTX *ctx,unsigned char *out,
	const unsigned char *in,size_t len)
{
	CRYPTO_ofb128_encrypt(in,out,len,ctx->cipher_data,
			ctx->iv,&ctx->num,
			(block128_f)AES_encrypt);
	return 1;
}

static int aes_cfb_cipher(EVP_CIPHER_CTX *ctx,unsigned char *out,
	const unsigned char *in,size_t len)
{
	CRYPTO_cfb128_encrypt(in,out,len,ctx->cipher_data,
			ctx->iv,&ctx->num,ctx->encrypt,
			(block128_f)AES_encrypt);
	return 1;
}

static int aes_cfb8_cipher(EVP_CIPHER_CTX *ctx,unsigned char *out,
	const unsigned char *in,size_t len)
{
	CRYPTO_cfb128_8_encrypt(in,out,len,ctx->cipher_data,
			ctx->iv,&ctx->num,ctx->encrypt,
			(block128_f)AES_encrypt);
	return 1;
}

static int aes_cfb1_cipher(EVP_CIPHER_CTX *ctx,unsigned char *out,
	const unsigned char *in,size_t len)
{
	if (ctx->flags&EVP_CIPH_FLAG_LENGTH_BITS) {
		CRYPTO_cfb128_1_encrypt(in,out,len,ctx->cipher_data,
			ctx->iv,&ctx->num,ctx->encrypt,
			(block128_f)AES_encrypt);
		return 1;
	}

	while (len>=MAXBITCHUNK) {
		CRYPTO_cfb128_1_encrypt(in,out,MAXBITCHUNK*8,ctx->cipher_data,
			ctx->iv,&ctx->num,ctx->encrypt,
			(block128_f)AES_encrypt);
		len-=MAXBITCHUNK;
	}
	if (len)
		CRYPTO_cfb128_1_encrypt(in,out,len*8,ctx->cipher_data,
			ctx->iv,&ctx->num,ctx->encrypt,
			(block128_f)AES_encrypt);
	
	return 1;
}

static int aes_ctr_cipher (EVP_CIPHER_CTX *ctx, unsigned char *out,
		const unsigned char *in, size_t len)
{
	unsigned int num;
	num = ctx->num;
#ifdef AES_CTR_ASM
	void AES_ctr32_encrypt(const unsigned char *in, unsigned char *out,
			size_t blocks, const AES_KEY *key,
			const unsigned char ivec[AES_BLOCK_SIZE]);

	CRYPTO_ctr128_encrypt_ctr32(in,out,len,
		&((EVP_AES_KEY *)ctx->cipher_data)->ks,
		ctx->iv,ctx->buf,&num,(ctr128_f)AES_ctr32_encrypt);
#else
	CRYPTO_ctr128_encrypt(in,out,len,
		&((EVP_AES_KEY *)ctx->cipher_data)->ks,
		ctx->iv,ctx->buf,&num,(block128_f)AES_encrypt);
#endif
	ctx->num = (size_t)num;
	return 1;
}

BLOCK_CIPHER_generic_pack(NID_aes,128,EVP_CIPH_FLAG_FIPS)
BLOCK_CIPHER_generic_pack(NID_aes,192,EVP_CIPH_FLAG_FIPS)
BLOCK_CIPHER_generic_pack(NID_aes,256,EVP_CIPH_FLAG_FIPS)

static int aes_gcm_cleanup(EVP_CIPHER_CTX *c)
	{
	EVP_AES_GCM_CTX *gctx = c->cipher_data;
	OPENSSL_cleanse(&gctx->gcm, sizeof(gctx->gcm));
	if (gctx->iv != c->iv)
		OPENSSL_free(gctx->iv);
	return 1;
	}

/* increment counter (64-bit int) by 1 */
static void ctr64_inc(unsigned char *counter) {
	int n=8;
	unsigned char  c;

	do {
		--n;
		c = counter[n];
		++c;
		counter[n] = c;
		if (c) return;
	} while (n);
}

static int aes_gcm_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
	{
	EVP_AES_GCM_CTX *gctx = c->cipher_data;
	switch (type)
		{
	case EVP_CTRL_INIT:
		gctx->key_set = 0;
		gctx->iv_set = 0;
		gctx->ivlen = c->cipher->iv_len;
		gctx->iv = c->iv;
		gctx->taglen = -1;
		gctx->iv_gen = 0;
		gctx->tls_aad_len = -1;
		return 1;

	case EVP_CTRL_GCM_SET_IVLEN:
		if (arg <= 0)
			return 0;
#ifdef OPENSSL_FIPS
		if (FIPS_module_mode() && !(c->flags & EVP_CIPH_FLAG_NON_FIPS_ALLOW)
						 && arg < 12)
			return 0;
#endif
		/* Allocate memory for IV if needed */
		if ((arg > EVP_MAX_IV_LENGTH) && (arg > gctx->ivlen))
			{
			if (gctx->iv != c->iv)
				OPENSSL_free(gctx->iv);
			gctx->iv = OPENSSL_malloc(arg);
			if (!gctx->iv)
				return 0;
			}
		gctx->ivlen = arg;
		return 1;

	case EVP_CTRL_GCM_SET_TAG:
		if (arg <= 0 || arg > 16 || c->encrypt)
			return 0;
		memcpy(c->buf, ptr, arg);
		gctx->taglen = arg;
		return 1;

	case EVP_CTRL_GCM_GET_TAG:
		if (arg <= 0 || arg > 16 || !c->encrypt || gctx->taglen < 0)
			return 0;
		memcpy(ptr, c->buf, arg);
		return 1;

	case EVP_CTRL_GCM_SET_IV_FIXED:
		/* Special case: -1 length restores whole IV */
		if (arg == -1)
			{
			memcpy(gctx->iv, ptr, gctx->ivlen);
			gctx->iv_gen = 1;
			return 1;
			}
		/* Fixed field must be at least 4 bytes and invocation field
		 * at least 8.
		 */
		if ((arg < 4) || (gctx->ivlen - arg) < 8)
			return 0;
		if (arg)
			memcpy(gctx->iv, ptr, arg);
		if (c->encrypt &&
			RAND_bytes(gctx->iv + arg, gctx->ivlen - arg) <= 0)
			return 0;
		gctx->iv_gen = 1;
		return 1;

	case EVP_CTRL_GCM_IV_GEN:
		if (gctx->iv_gen == 0 || gctx->key_set == 0)
			return 0;
		CRYPTO_gcm128_setiv(&gctx->gcm, gctx->iv, gctx->ivlen);
		if (arg <= 0 || arg > gctx->ivlen)
			arg = gctx->ivlen;
		memcpy(ptr, gctx->iv + gctx->ivlen - arg, arg);
		/* Invocation field will be at least 8 bytes in size and
		 * so no need to check wrap around or increment more than
		 * last 8 bytes.
		 */
		ctr64_inc(gctx->iv + gctx->ivlen - 8);
		gctx->iv_set = 1;
		return 1;

	case EVP_CTRL_GCM_SET_IV_INV:
		if (gctx->iv_gen == 0 || gctx->key_set == 0 || c->encrypt)
			return 0;
		memcpy(gctx->iv + gctx->ivlen - arg, ptr, arg);
		CRYPTO_gcm128_setiv(&gctx->gcm, gctx->iv, gctx->ivlen);
		gctx->iv_set = 1;
		return 1;

	case EVP_CTRL_AEAD_TLS1_AAD:
		/* Save the AAD for later use */
		if (arg != 13)
			return 0;
		memcpy(c->buf, ptr, arg);
		gctx->tls_aad_len = arg;
			{
			unsigned int len=c->buf[arg-2]<<8|c->buf[arg-1];
			/* Correct length for explicit IV */
			len -= EVP_GCM_TLS_EXPLICIT_IV_LEN;
			/* If decrypting correct for tag too */
			if (!c->encrypt)
				len -= EVP_GCM_TLS_TAG_LEN;
                        c->buf[arg-2] = len>>8;
                        c->buf[arg-1] = len & 0xff;
			}
		/* Extra padding: tag appended to record */
		return EVP_GCM_TLS_TAG_LEN;

	default:
		return -1;

		}
	}

static int aes_gcm_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
                        const unsigned char *iv, int enc)
	{
	EVP_AES_GCM_CTX *gctx = ctx->cipher_data;
	if (!iv && !key)
		return 1;
	if (key)
		{
		AES_set_encrypt_key(key, ctx->key_len * 8, &gctx->ks);
		CRYPTO_gcm128_init(&gctx->gcm, &gctx->ks, (block128_f)AES_encrypt);
		/* If we have an iv can set it directly, otherwise use
		 * saved IV.
		 */
		if (iv == NULL && gctx->iv_set)
			iv = gctx->iv;
		if (iv)
			{
			CRYPTO_gcm128_setiv(&gctx->gcm, iv, gctx->ivlen);
			gctx->iv_set = 1;
			}
		gctx->key_set = 1;
		}
	else
		{
		/* If key set use IV, otherwise copy */
		if (gctx->key_set)
			CRYPTO_gcm128_setiv(&gctx->gcm, iv, gctx->ivlen);
		else
			memcpy(gctx->iv, iv, gctx->ivlen);
		gctx->iv_set = 1;
		gctx->iv_gen = 0;
		}
	return 1;
	}

/* Handle TLS GCM packet format. This consists of the last portion of the IV
 * followed by the payload and finally the tag. On encrypt generate IV,
 * encrypt payload and write the tag. On verify retrieve IV, decrypt payload
 * and verify tag.
 */

static int aes_gcm_tls_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
		const unsigned char *in, size_t len)
	{
	EVP_AES_GCM_CTX *gctx = ctx->cipher_data;
	int rv = -1;
	/* Encrypt/decrypt must be performed in place */
	if (out != in)
		return -1;
	/* Set IV from start of buffer or generate IV and write to start
	 * of buffer.
	 */
	if (EVP_CIPHER_CTX_ctrl(ctx, ctx->encrypt ?
				EVP_CTRL_GCM_IV_GEN : EVP_CTRL_GCM_SET_IV_INV,
				EVP_GCM_TLS_EXPLICIT_IV_LEN, out) <= 0)
		goto err;
	/* Use saved AAD */
	if (CRYPTO_gcm128_aad(&gctx->gcm, ctx->buf, gctx->tls_aad_len))
		goto err;
	/* Fix buffer and length to point to payload */
	in += EVP_GCM_TLS_EXPLICIT_IV_LEN;
	out += EVP_GCM_TLS_EXPLICIT_IV_LEN;
	len -= EVP_GCM_TLS_EXPLICIT_IV_LEN + EVP_GCM_TLS_TAG_LEN;
	if (ctx->encrypt)
		{
		/* Encrypt payload */
		if (CRYPTO_gcm128_encrypt(&gctx->gcm, in, out, len))
			goto err;
		out += len;
		/* Finally write tag */
		CRYPTO_gcm128_tag(&gctx->gcm, out, EVP_GCM_TLS_TAG_LEN);
		rv = len + EVP_GCM_TLS_EXPLICIT_IV_LEN + EVP_GCM_TLS_TAG_LEN;
		}
	else
		{
		/* Decrypt */
		if (CRYPTO_gcm128_decrypt(&gctx->gcm, in, out, len))
			goto err;
		/* Retrieve tag */
		CRYPTO_gcm128_tag(&gctx->gcm, ctx->buf,
					EVP_GCM_TLS_TAG_LEN);
		/* If tag mismatch wipe buffer */
		if (memcmp(ctx->buf, in + len, EVP_GCM_TLS_TAG_LEN))
			{
			OPENSSL_cleanse(out, len);
			goto err;
			}
		rv = len;
		}

	err:
	gctx->iv_set = 0;
	gctx->tls_aad_len = -1;
	return rv;
	}

static int aes_gcm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
		const unsigned char *in, size_t len)
	{
	EVP_AES_GCM_CTX *gctx = ctx->cipher_data;
	/* If not set up, return error */
	if (!gctx->key_set)
		return -1;

	if (gctx->tls_aad_len >= 0)
		return aes_gcm_tls_cipher(ctx, out, in, len);

	if (!gctx->iv_set)
		return -1;
	if (!ctx->encrypt && gctx->taglen < 0)
		return -1;
	if (in)
		{
		if (out == NULL)
			{
			if (CRYPTO_gcm128_aad(&gctx->gcm, in, len))
				return -1;
			}
		else if (ctx->encrypt)
			{
			if (CRYPTO_gcm128_encrypt(&gctx->gcm, in, out, len))
				return -1;
			}
		else
			{
			if (CRYPTO_gcm128_decrypt(&gctx->gcm, in, out, len))
				return -1;
			}
		return len;
		}
	else
		{
		if (!ctx->encrypt)
			{
			if (CRYPTO_gcm128_finish(&gctx->gcm,
					ctx->buf, gctx->taglen) != 0)
				return -1;
			gctx->iv_set = 0;
			return 0;
			}
		CRYPTO_gcm128_tag(&gctx->gcm, ctx->buf, 16);
		gctx->taglen = 16;
		/* Don't reuse the IV */
		gctx->iv_set = 0;
		return 0;
		}

	}

#define CUSTOM_FLAGS	(EVP_CIPH_FLAG_DEFAULT_ASN1 \
		| EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER \
		| EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT)

BLOCK_CIPHER_custom(NID_aes,128,1,12,gcm,GCM,
		EVP_CIPH_FLAG_FIPS|EVP_CIPH_FLAG_AEAD_CIPHER|CUSTOM_FLAGS)
BLOCK_CIPHER_custom(NID_aes,192,1,12,gcm,GCM,
		EVP_CIPH_FLAG_FIPS|EVP_CIPH_FLAG_AEAD_CIPHER|CUSTOM_FLAGS)
BLOCK_CIPHER_custom(NID_aes,256,1,12,gcm,GCM,
		EVP_CIPH_FLAG_FIPS|EVP_CIPH_FLAG_AEAD_CIPHER|CUSTOM_FLAGS)

static int aes_xts_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
	{
	EVP_AES_XTS_CTX *xctx = c->cipher_data;
	if (type != EVP_CTRL_INIT)
		return -1;
	/* key1 and key2 are used as an indicator both key and IV are set */
	xctx->xts.key1 = NULL;
	xctx->xts.key2 = NULL;
	return 1;
	}

static int aes_xts_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
                        const unsigned char *iv, int enc)
	{
	EVP_AES_XTS_CTX *xctx = ctx->cipher_data;
	if (!iv && !key)
		return 1;

	if (key)
		{
		/* key_len is two AES keys */
		if (enc)
			{
			AES_set_encrypt_key(key, ctx->key_len * 4, &xctx->ks1);
			xctx->xts.block1 = (block128_f)AES_encrypt;
			}
		else
			{
			AES_set_decrypt_key(key, ctx->key_len * 4, &xctx->ks1);
			xctx->xts.block1 = (block128_f)AES_decrypt;
			}

		AES_set_encrypt_key(key + ctx->key_len/2,
						ctx->key_len * 4, &xctx->ks2);
		xctx->xts.block2 = (block128_f)AES_encrypt;

		xctx->xts.key1 = &xctx->ks1;
		}

	if (iv)
		{
		xctx->xts.key2 = &xctx->ks2;
		memcpy(ctx->iv, iv, 16);
		}

	return 1;
	}

static int aes_xts_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
		const unsigned char *in, size_t len)
	{
	EVP_AES_XTS_CTX *xctx = ctx->cipher_data;
	if (!xctx->xts.key1 || !xctx->xts.key2)
		return -1;
	if (!out || !in)
		return -1;
#ifdef OPENSSL_FIPS
	/* Requirement of SP800-38E */
	if (FIPS_module_mode() && !(ctx->flags & EVP_CIPH_FLAG_NON_FIPS_ALLOW) &&
			(len > (1L<<20)*16))
		{
		EVPerr(EVP_F_AES_XTS, EVP_R_TOO_LARGE);
		return -1;
		}
#endif
	if (CRYPTO_xts128_encrypt(&xctx->xts, ctx->iv, in, out, len,
								ctx->encrypt))
		return -1;
	return len;
	}

#define aes_xts_cleanup NULL

BLOCK_CIPHER_custom(NID_aes,128,1,16,xts,XTS,EVP_CIPH_FLAG_FIPS|CUSTOM_FLAGS)
BLOCK_CIPHER_custom(NID_aes,256,1,16,xts,XTS,EVP_CIPH_FLAG_FIPS|CUSTOM_FLAGS)

static int aes_ccm_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
	{
	EVP_AES_CCM_CTX *cctx = c->cipher_data;
	switch (type)
		{
	case EVP_CTRL_INIT:
		cctx->key_set = 0;
		cctx->iv_set = 0;
		cctx->L = 8;
		cctx->M = 12;
		cctx->tag_set = 0;
		cctx->len_set = 0;
		return 1;

	case EVP_CTRL_CCM_SET_IVLEN:
		arg = 15 - arg;
	case EVP_CTRL_CCM_SET_L:
		if (arg < 2 || arg > 8)
			return 0;
		cctx->L = arg;
		return 1;

	case EVP_CTRL_CCM_SET_TAG:
		if ((arg & 1) || arg < 4 || arg > 16)
			return 0;
		if ((c->encrypt && ptr) || (!c->encrypt && !ptr))
			return 0;
		if (ptr)
			{
			cctx->tag_set = 1;
			memcpy(c->buf, ptr, arg);
			}
		cctx->M = arg;
		return 1;

	case EVP_CTRL_CCM_GET_TAG:
		if (!c->encrypt || !cctx->tag_set)
			return 0;
		if(!CRYPTO_ccm128_tag(&cctx->ccm, ptr, (size_t)arg))
			return 0;
		cctx->tag_set = 0;
		cctx->iv_set = 0;
		cctx->len_set = 0;
		return 1;

	default:
		return -1;

		}
	}

static int aes_ccm_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
                        const unsigned char *iv, int enc)
	{
	EVP_AES_CCM_CTX *cctx = ctx->cipher_data;
	if (!iv && !key)
		return 1;
	if (key)
		{
		AES_set_encrypt_key(key, ctx->key_len * 8, &cctx->ks);
		CRYPTO_ccm128_init(&cctx->ccm, cctx->M, cctx->L,
					&cctx->ks, (block128_f)AES_encrypt);
		cctx->key_set = 1;
		}
	if (iv)
		{
		memcpy(ctx->iv, iv, 15 - cctx->L);
		cctx->iv_set = 1;
		}
	return 1;
	}

static int aes_ccm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
		const unsigned char *in, size_t len)
	{
	EVP_AES_CCM_CTX *cctx = ctx->cipher_data;
	CCM128_CONTEXT *ccm = &cctx->ccm;
	/* If not set up, return error */
	if (!cctx->iv_set && !cctx->key_set)
		return -1;
	if (!ctx->encrypt && !cctx->tag_set)
		return -1;
	if (!out)
		{
		if (!in)
			{
			if (CRYPTO_ccm128_setiv(ccm, ctx->iv, 15 - cctx->L,len))
				return -1;
			cctx->len_set = 1;
			return len;
			}
		/* If have AAD need message length */
		if (!cctx->len_set && len)
			return -1;
		CRYPTO_ccm128_aad(ccm, in, len);
		return len;
		}
	/* EVP_*Final() doesn't return any data */
	if (!in)
		return 0;
	/* If not set length yet do it */
	if (!cctx->len_set)
		{
		if (CRYPTO_ccm128_setiv(ccm, ctx->iv, 15 - cctx->L, len))
			return -1;
		cctx->len_set = 1;
		}
	if (ctx->encrypt)
		{
		if (CRYPTO_ccm128_encrypt(ccm, in, out, len))
			return -1;
		cctx->tag_set = 1;
		return len;
		}
	else
		{
		int rv = -1;
		if (!CRYPTO_ccm128_decrypt(ccm, in, out, len))
			{
			unsigned char tag[16];
			if (CRYPTO_ccm128_tag(ccm, tag, cctx->M))
				{
				if (!memcmp(tag, ctx->buf, cctx->M))
					rv = len;
				}
			}
		if (rv == -1)
			OPENSSL_cleanse(out, len);
		cctx->iv_set = 0;
		cctx->tag_set = 0;
		cctx->len_set = 0;
		return rv;
		}

	}

#define aes_ccm_cleanup NULL

BLOCK_CIPHER_custom(NID_aes,128,1,12,ccm,CCM,EVP_CIPH_FLAG_FIPS|CUSTOM_FLAGS)
BLOCK_CIPHER_custom(NID_aes,192,1,12,ccm,CCM,EVP_CIPH_FLAG_FIPS|CUSTOM_FLAGS)
BLOCK_CIPHER_custom(NID_aes,256,1,12,ccm,CCM,EVP_CIPH_FLAG_FIPS|CUSTOM_FLAGS)

#endif