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cryptosoft.c
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/* $OpenBSD: cryptosoft.c,v 1.35 2002/04/26 08:43:50 deraadt Exp $ */
/*-
* The author of this code is Angelos D. Keromytis ([email protected])
* Copyright (c) 2002-2006 Sam Leffler, Errno Consulting
*
* This code was written by Angelos D. Keromytis in Athens, Greece, in
* February 2000. Network Security Technologies Inc. (NSTI) kindly
* supported the development of this code.
*
* Copyright (c) 2000, 2001 Angelos D. Keromytis
* Copyright (c) 2014 The FreeBSD Foundation
* All rights reserved.
*
* Portions of this software were developed by John-Mark Gurney
* under sponsorship of the FreeBSD Foundation and
* Rubicon Communications, LLC (Netgate).
*
* Permission to use, copy, and modify this software with or without fee
* is hereby granted, provided that this entire notice is included in
* all source code copies of any software which is or includes a copy or
* modification of this software.
*
* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
* REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
* MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
* PURPOSE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/module.h>
#include <sys/sysctl.h>
#include <sys/errno.h>
#include <sys/random.h>
#include <sys/kernel.h>
#include <sys/uio.h>
#include <sys/lock.h>
#include <sys/rwlock.h>
#include <sys/endian.h>
#include <sys/limits.h>
#include <sys/mutex.h>
#include <crypto/sha1.h>
#include <opencrypto/rmd160.h>
#include <opencrypto/cryptodev.h>
#include <opencrypto/xform.h>
#include <sys/kobj.h>
#include <sys/bus.h>
#include "cryptodev_if.h"
struct swcr_auth {
void *sw_ictx;
void *sw_octx;
struct auth_hash *sw_axf;
uint16_t sw_mlen;
};
struct swcr_encdec {
void *sw_kschedule;
struct enc_xform *sw_exf;
};
struct swcr_compdec {
struct comp_algo *sw_cxf;
};
struct swcr_session {
struct mtx swcr_lock;
int (*swcr_process)(struct swcr_session *, struct cryptop *);
struct swcr_auth swcr_auth;
struct swcr_encdec swcr_encdec;
struct swcr_compdec swcr_compdec;
};
static int32_t swcr_id;
static void swcr_freesession(device_t dev, crypto_session_t cses);
/* Used for CRYPTO_NULL_CBC. */
static int
swcr_null(struct swcr_session *ses, struct cryptop *crp)
{
return (0);
}
/*
* Apply a symmetric encryption/decryption algorithm.
*/
static int
swcr_encdec(struct swcr_session *ses, struct cryptop *crp)
{
unsigned char iv[EALG_MAX_BLOCK_LEN], blk[EALG_MAX_BLOCK_LEN];
unsigned char *ivp, *nivp, iv2[EALG_MAX_BLOCK_LEN];
const struct crypto_session_params *csp;
struct swcr_encdec *sw;
struct enc_xform *exf;
int i, blks, inlen, ivlen, outlen, resid;
struct crypto_buffer_cursor cc_in, cc_out;
const unsigned char *inblk;
unsigned char *outblk;
int error;
bool encrypting;
error = 0;
sw = &ses->swcr_encdec;
exf = sw->sw_exf;
ivlen = exf->ivsize;
if (exf->native_blocksize == 0) {
/* Check for non-padded data */
if ((crp->crp_payload_length % exf->blocksize) != 0)
return (EINVAL);
blks = exf->blocksize;
} else
blks = exf->native_blocksize;
if (exf == &enc_xform_aes_icm &&
(crp->crp_flags & CRYPTO_F_IV_SEPARATE) == 0)
return (EINVAL);
if (crp->crp_cipher_key != NULL) {
csp = crypto_get_params(crp->crp_session);
error = exf->setkey(sw->sw_kschedule,
crp->crp_cipher_key, csp->csp_cipher_klen);
if (error)
return (error);
}
crypto_read_iv(crp, iv);
if (exf->reinit) {
/*
* xforms that provide a reinit method perform all IV
* handling themselves.
*/
exf->reinit(sw->sw_kschedule, iv);
}
ivp = iv;
crypto_cursor_init(&cc_in, &crp->crp_buf);
crypto_cursor_advance(&cc_in, crp->crp_payload_start);
inlen = crypto_cursor_seglen(&cc_in);
inblk = crypto_cursor_segbase(&cc_in);
if (CRYPTO_HAS_OUTPUT_BUFFER(crp)) {
crypto_cursor_init(&cc_out, &crp->crp_obuf);
crypto_cursor_advance(&cc_out, crp->crp_payload_output_start);
} else
cc_out = cc_in;
outlen = crypto_cursor_seglen(&cc_out);
outblk = crypto_cursor_segbase(&cc_out);
resid = crp->crp_payload_length;
encrypting = CRYPTO_OP_IS_ENCRYPT(crp->crp_op);
/*
* Loop through encrypting blocks. 'inlen' is the remaining
* length of the current segment in the input buffer.
* 'outlen' is the remaining length of current segment in the
* output buffer.
*/
while (resid >= blks) {
/*
* If the current block is not contained within the
* current input/output segment, use 'blk' as a local
* buffer.
*/
if (inlen < blks) {
crypto_cursor_copydata(&cc_in, blks, blk);
inblk = blk;
}
if (outlen < blks)
outblk = blk;
/*
* Ciphers without a 'reinit' hook are assumed to be
* used in CBC mode where the chaining is done here.
*/
if (exf->reinit != NULL) {
if (encrypting)
exf->encrypt(sw->sw_kschedule, inblk, outblk);
else
exf->decrypt(sw->sw_kschedule, inblk, outblk);
} else if (encrypting) {
/* XOR with previous block */
for (i = 0; i < blks; i++)
outblk[i] = inblk[i] ^ ivp[i];
exf->encrypt(sw->sw_kschedule, outblk, outblk);
/*
* Keep encrypted block for XOR'ing
* with next block
*/
memcpy(iv, outblk, blks);
ivp = iv;
} else { /* decrypt */
/*
* Keep encrypted block for XOR'ing
* with next block
*/
nivp = (ivp == iv) ? iv2 : iv;
memcpy(nivp, inblk, blks);
exf->decrypt(sw->sw_kschedule, inblk, outblk);
/* XOR with previous block */
for (i = 0; i < blks; i++)
outblk[i] ^= ivp[i];
ivp = nivp;
}
if (inlen < blks) {
inlen = crypto_cursor_seglen(&cc_in);
inblk = crypto_cursor_segbase(&cc_in);
} else {
crypto_cursor_advance(&cc_in, blks);
inlen -= blks;
inblk += blks;
}
if (outlen < blks) {
crypto_cursor_copyback(&cc_out, blks, blk);
outlen = crypto_cursor_seglen(&cc_out);
outblk = crypto_cursor_segbase(&cc_out);
} else {
crypto_cursor_advance(&cc_out, blks);
outlen -= blks;
outblk += blks;
}
resid -= blks;
}
/* Handle trailing partial block for stream ciphers. */
if (resid > 0) {
KASSERT(exf->native_blocksize != 0,
("%s: partial block of %d bytes for cipher %s",
__func__, i, exf->name));
KASSERT(exf->reinit != NULL,
("%s: partial block cipher %s without reinit hook",
__func__, exf->name));
KASSERT(resid < blks, ("%s: partial block too big", __func__));
inlen = crypto_cursor_seglen(&cc_in);
outlen = crypto_cursor_seglen(&cc_out);
if (inlen < resid) {
crypto_cursor_copydata(&cc_in, resid, blk);
inblk = blk;
} else
inblk = crypto_cursor_segbase(&cc_in);
if (outlen < resid)
outblk = blk;
else
outblk = crypto_cursor_segbase(&cc_out);
if (encrypting)
exf->encrypt_last(sw->sw_kschedule, inblk, outblk,
resid);
else
exf->decrypt_last(sw->sw_kschedule, inblk, outblk,
resid);
if (outlen < resid)
crypto_cursor_copyback(&cc_out, resid, blk);
}
explicit_bzero(blk, sizeof(blk));
explicit_bzero(iv, sizeof(iv));
explicit_bzero(iv2, sizeof(iv2));
return (0);
}
static void
swcr_authprepare(struct auth_hash *axf, struct swcr_auth *sw,
const uint8_t *key, int klen)
{
switch (axf->type) {
case CRYPTO_SHA1_HMAC:
case CRYPTO_SHA2_224_HMAC:
case CRYPTO_SHA2_256_HMAC:
case CRYPTO_SHA2_384_HMAC:
case CRYPTO_SHA2_512_HMAC:
case CRYPTO_NULL_HMAC:
case CRYPTO_RIPEMD160_HMAC:
hmac_init_ipad(axf, key, klen, sw->sw_ictx);
hmac_init_opad(axf, key, klen, sw->sw_octx);
break;
case CRYPTO_POLY1305:
case CRYPTO_BLAKE2B:
case CRYPTO_BLAKE2S:
axf->Setkey(sw->sw_ictx, key, klen);
axf->Init(sw->sw_ictx);
break;
default:
panic("%s: algorithm %d doesn't use keys", __func__, axf->type);
}
}
/*
* Compute or verify hash.
*/
static int
swcr_authcompute(struct swcr_session *ses, struct cryptop *crp)
{
u_char aalg[HASH_MAX_LEN];
const struct crypto_session_params *csp;
struct swcr_auth *sw;
struct auth_hash *axf;
union authctx ctx;
int err;
sw = &ses->swcr_auth;
axf = sw->sw_axf;
csp = crypto_get_params(crp->crp_session);
if (crp->crp_auth_key != NULL) {
swcr_authprepare(axf, sw, crp->crp_auth_key,
csp->csp_auth_klen);
}
bcopy(sw->sw_ictx, &ctx, axf->ctxsize);
if (crp->crp_aad != NULL)
err = axf->Update(&ctx, crp->crp_aad, crp->crp_aad_length);
else
err = crypto_apply(crp, crp->crp_aad_start, crp->crp_aad_length,
axf->Update, &ctx);
if (err)
goto out;
if (CRYPTO_HAS_OUTPUT_BUFFER(crp) &&
CRYPTO_OP_IS_ENCRYPT(crp->crp_op))
err = crypto_apply_buf(&crp->crp_obuf,
crp->crp_payload_output_start, crp->crp_payload_length,
axf->Update, &ctx);
else
err = crypto_apply(crp, crp->crp_payload_start,
crp->crp_payload_length, axf->Update, &ctx);
if (err)
goto out;
if (csp->csp_flags & CSP_F_ESN)
axf->Update(&ctx, crp->crp_esn, 4);
axf->Final(aalg, &ctx);
if (sw->sw_octx != NULL) {
bcopy(sw->sw_octx, &ctx, axf->ctxsize);
axf->Update(&ctx, aalg, axf->hashsize);
axf->Final(aalg, &ctx);
}
if (crp->crp_op & CRYPTO_OP_VERIFY_DIGEST) {
u_char uaalg[HASH_MAX_LEN];
crypto_copydata(crp, crp->crp_digest_start, sw->sw_mlen, uaalg);
if (timingsafe_bcmp(aalg, uaalg, sw->sw_mlen) != 0)
err = EBADMSG;
explicit_bzero(uaalg, sizeof(uaalg));
} else {
/* Inject the authentication data */
crypto_copyback(crp, crp->crp_digest_start, sw->sw_mlen, aalg);
}
explicit_bzero(aalg, sizeof(aalg));
out:
explicit_bzero(&ctx, sizeof(ctx));
return (err);
}
CTASSERT(INT_MAX <= (1ll<<39) - 256); /* GCM: plain text < 2^39-256 */
CTASSERT(INT_MAX <= (uint64_t)-1); /* GCM: associated data <= 2^64-1 */
static int
swcr_gmac(struct swcr_session *ses, struct cryptop *crp)
{
uint32_t blkbuf[howmany(AES_BLOCK_LEN, sizeof(uint32_t))];
u_char *blk = (u_char *)blkbuf;
u_char tag[GMAC_DIGEST_LEN];
u_char iv[AES_BLOCK_LEN];
struct crypto_buffer_cursor cc;
const u_char *inblk;
union authctx ctx;
struct swcr_auth *swa;
struct auth_hash *axf;
uint32_t *blkp;
int blksz, error, ivlen, len, resid;
swa = &ses->swcr_auth;
axf = swa->sw_axf;
bcopy(swa->sw_ictx, &ctx, axf->ctxsize);
blksz = GMAC_BLOCK_LEN;
KASSERT(axf->blocksize == blksz, ("%s: axf block size mismatch",
__func__));
/* Initialize the IV */
ivlen = AES_GCM_IV_LEN;
crypto_read_iv(crp, iv);
axf->Reinit(&ctx, iv, ivlen);
crypto_cursor_init(&cc, &crp->crp_buf);
crypto_cursor_advance(&cc, crp->crp_payload_start);
for (resid = crp->crp_payload_length; resid >= blksz; resid -= len) {
len = crypto_cursor_seglen(&cc);
if (len >= blksz) {
inblk = crypto_cursor_segbase(&cc);
len = rounddown(MIN(len, resid), blksz);
crypto_cursor_advance(&cc, len);
} else {
len = blksz;
crypto_cursor_copydata(&cc, len, blk);
inblk = blk;
}
axf->Update(&ctx, inblk, len);
}
if (resid > 0) {
memset(blk, 0, blksz);
crypto_cursor_copydata(&cc, resid, blk);
axf->Update(&ctx, blk, blksz);
}
/* length block */
memset(blk, 0, blksz);
blkp = (uint32_t *)blk + 1;
*blkp = htobe32(crp->crp_payload_length * 8);
axf->Update(&ctx, blk, blksz);
/* Finalize MAC */
axf->Final(tag, &ctx);
error = 0;
if (crp->crp_op & CRYPTO_OP_VERIFY_DIGEST) {
u_char tag2[GMAC_DIGEST_LEN];
crypto_copydata(crp, crp->crp_digest_start, swa->sw_mlen,
tag2);
if (timingsafe_bcmp(tag, tag2, swa->sw_mlen) != 0)
error = EBADMSG;
explicit_bzero(tag2, sizeof(tag2));
} else {
/* Inject the authentication data */
crypto_copyback(crp, crp->crp_digest_start, swa->sw_mlen, tag);
}
explicit_bzero(blkbuf, sizeof(blkbuf));
explicit_bzero(tag, sizeof(tag));
explicit_bzero(iv, sizeof(iv));
return (error);
}
static int
swcr_gcm(struct swcr_session *ses, struct cryptop *crp)
{
uint32_t blkbuf[howmany(AES_BLOCK_LEN, sizeof(uint32_t))];
u_char *blk = (u_char *)blkbuf;
u_char tag[GMAC_DIGEST_LEN];
u_char iv[AES_BLOCK_LEN];
struct crypto_buffer_cursor cc_in, cc_out;
const u_char *inblk;
u_char *outblk;
union authctx ctx;
struct swcr_auth *swa;
struct swcr_encdec *swe;
struct auth_hash *axf;
struct enc_xform *exf;
uint32_t *blkp;
int blksz, error, ivlen, len, r, resid;
swa = &ses->swcr_auth;
axf = swa->sw_axf;
bcopy(swa->sw_ictx, &ctx, axf->ctxsize);
blksz = GMAC_BLOCK_LEN;
KASSERT(axf->blocksize == blksz, ("%s: axf block size mismatch",
__func__));
swe = &ses->swcr_encdec;
exf = swe->sw_exf;
KASSERT(axf->blocksize == exf->native_blocksize,
("%s: blocksize mismatch", __func__));
if ((crp->crp_flags & CRYPTO_F_IV_SEPARATE) == 0)
return (EINVAL);
/* Initialize the IV */
ivlen = AES_GCM_IV_LEN;
bcopy(crp->crp_iv, iv, ivlen);
/* Supply MAC with IV */
axf->Reinit(&ctx, iv, ivlen);
/* Supply MAC with AAD */
if (crp->crp_aad != NULL) {
len = rounddown(crp->crp_aad_length, blksz);
if (len != 0)
axf->Update(&ctx, crp->crp_aad, len);
if (crp->crp_aad_length != len) {
memset(blk, 0, blksz);
memcpy(blk, (char *)crp->crp_aad + len,
crp->crp_aad_length - len);
axf->Update(&ctx, blk, blksz);
}
} else {
crypto_cursor_init(&cc_in, &crp->crp_buf);
crypto_cursor_advance(&cc_in, crp->crp_aad_start);
for (resid = crp->crp_aad_length; resid >= blksz;
resid -= len) {
len = crypto_cursor_seglen(&cc_in);
if (len >= blksz) {
inblk = crypto_cursor_segbase(&cc_in);
len = rounddown(MIN(len, resid), blksz);
crypto_cursor_advance(&cc_in, len);
} else {
len = blksz;
crypto_cursor_copydata(&cc_in, len, blk);
inblk = blk;
}
axf->Update(&ctx, inblk, len);
}
if (resid > 0) {
memset(blk, 0, blksz);
crypto_cursor_copydata(&cc_in, resid, blk);
axf->Update(&ctx, blk, blksz);
}
}
if (crp->crp_cipher_key != NULL)
exf->setkey(swe->sw_kschedule, crp->crp_cipher_key,
crypto_get_params(crp->crp_session)->csp_cipher_klen);
exf->reinit(swe->sw_kschedule, iv);
/* Do encryption with MAC */
crypto_cursor_init(&cc_in, &crp->crp_buf);
crypto_cursor_advance(&cc_in, crp->crp_payload_start);
if (CRYPTO_HAS_OUTPUT_BUFFER(crp)) {
crypto_cursor_init(&cc_out, &crp->crp_obuf);
crypto_cursor_advance(&cc_out, crp->crp_payload_output_start);
} else
cc_out = cc_in;
for (resid = crp->crp_payload_length; resid >= blksz; resid -= blksz) {
if (crypto_cursor_seglen(&cc_in) < blksz) {
crypto_cursor_copydata(&cc_in, blksz, blk);
inblk = blk;
} else {
inblk = crypto_cursor_segbase(&cc_in);
crypto_cursor_advance(&cc_in, blksz);
}
if (CRYPTO_OP_IS_ENCRYPT(crp->crp_op)) {
if (crypto_cursor_seglen(&cc_out) < blksz)
outblk = blk;
else
outblk = crypto_cursor_segbase(&cc_out);
exf->encrypt(swe->sw_kschedule, inblk, outblk);
axf->Update(&ctx, outblk, blksz);
if (outblk == blk)
crypto_cursor_copyback(&cc_out, blksz, blk);
else
crypto_cursor_advance(&cc_out, blksz);
} else {
axf->Update(&ctx, inblk, blksz);
}
}
if (resid > 0) {
crypto_cursor_copydata(&cc_in, resid, blk);
if (CRYPTO_OP_IS_ENCRYPT(crp->crp_op)) {
exf->encrypt_last(swe->sw_kschedule, blk, blk, resid);
crypto_cursor_copyback(&cc_out, resid, blk);
}
axf->Update(&ctx, blk, resid);
}
/* length block */
memset(blk, 0, blksz);
blkp = (uint32_t *)blk + 1;
*blkp = htobe32(crp->crp_aad_length * 8);
blkp = (uint32_t *)blk + 3;
*blkp = htobe32(crp->crp_payload_length * 8);
axf->Update(&ctx, blk, blksz);
/* Finalize MAC */
axf->Final(tag, &ctx);
/* Validate tag */
error = 0;
if (!CRYPTO_OP_IS_ENCRYPT(crp->crp_op)) {
u_char tag2[GMAC_DIGEST_LEN];
crypto_copydata(crp, crp->crp_digest_start, swa->sw_mlen, tag2);
r = timingsafe_bcmp(tag, tag2, swa->sw_mlen);
explicit_bzero(tag2, sizeof(tag2));
if (r != 0) {
error = EBADMSG;
goto out;
}
/* tag matches, decrypt data */
crypto_cursor_init(&cc_in, &crp->crp_buf);
crypto_cursor_advance(&cc_in, crp->crp_payload_start);
for (resid = crp->crp_payload_length; resid > blksz;
resid -= blksz) {
if (crypto_cursor_seglen(&cc_in) < blksz) {
crypto_cursor_copydata(&cc_in, blksz, blk);
inblk = blk;
} else {
inblk = crypto_cursor_segbase(&cc_in);
crypto_cursor_advance(&cc_in, blksz);
}
if (crypto_cursor_seglen(&cc_out) < blksz)
outblk = blk;
else
outblk = crypto_cursor_segbase(&cc_out);
exf->decrypt(swe->sw_kschedule, inblk, outblk);
if (outblk == blk)
crypto_cursor_copyback(&cc_out, blksz, blk);
else
crypto_cursor_advance(&cc_out, blksz);
}
if (resid > 0) {
crypto_cursor_copydata(&cc_in, resid, blk);
exf->decrypt_last(swe->sw_kschedule, blk, blk, resid);
crypto_cursor_copyback(&cc_out, resid, blk);
}
} else {
/* Inject the authentication data */
crypto_copyback(crp, crp->crp_digest_start, swa->sw_mlen, tag);
}
out:
explicit_bzero(blkbuf, sizeof(blkbuf));
explicit_bzero(tag, sizeof(tag));
explicit_bzero(iv, sizeof(iv));
return (error);
}
static int
swcr_ccm_cbc_mac(struct swcr_session *ses, struct cryptop *crp)
{
u_char tag[AES_CBC_MAC_HASH_LEN];
u_char iv[AES_BLOCK_LEN];
union authctx ctx;
struct swcr_auth *swa;
struct auth_hash *axf;
int error, ivlen;
swa = &ses->swcr_auth;
axf = swa->sw_axf;
bcopy(swa->sw_ictx, &ctx, axf->ctxsize);
/* Initialize the IV */
ivlen = AES_CCM_IV_LEN;
crypto_read_iv(crp, iv);
/*
* AES CCM-CBC-MAC needs to know the length of both the auth
* data and payload data before doing the auth computation.
*/
ctx.aes_cbc_mac_ctx.authDataLength = crp->crp_payload_length;
ctx.aes_cbc_mac_ctx.cryptDataLength = 0;
axf->Reinit(&ctx, iv, ivlen);
if (crp->crp_aad != NULL)
error = axf->Update(&ctx, crp->crp_aad, crp->crp_aad_length);
else
error = crypto_apply(crp, crp->crp_payload_start,
crp->crp_payload_length, axf->Update, &ctx);
if (error)
return (error);
/* Finalize MAC */
axf->Final(tag, &ctx);
if (crp->crp_op & CRYPTO_OP_VERIFY_DIGEST) {
u_char tag2[AES_CBC_MAC_HASH_LEN];
crypto_copydata(crp, crp->crp_digest_start, swa->sw_mlen,
tag2);
if (timingsafe_bcmp(tag, tag2, swa->sw_mlen) != 0)
error = EBADMSG;
explicit_bzero(tag2, sizeof(tag));
} else {
/* Inject the authentication data */
crypto_copyback(crp, crp->crp_digest_start, swa->sw_mlen, tag);
}
explicit_bzero(tag, sizeof(tag));
explicit_bzero(iv, sizeof(iv));
return (error);
}
static int
swcr_ccm(struct swcr_session *ses, struct cryptop *crp)
{
uint32_t blkbuf[howmany(AES_BLOCK_LEN, sizeof(uint32_t))];
u_char *blk = (u_char *)blkbuf;
u_char tag[AES_CBC_MAC_HASH_LEN];
u_char iv[AES_BLOCK_LEN];
struct crypto_buffer_cursor cc_in, cc_out;
const u_char *inblk;
u_char *outblk;
union authctx ctx;
struct swcr_auth *swa;
struct swcr_encdec *swe;
struct auth_hash *axf;
struct enc_xform *exf;
int blksz, error, ivlen, r, resid;
swa = &ses->swcr_auth;
axf = swa->sw_axf;
bcopy(swa->sw_ictx, &ctx, axf->ctxsize);
blksz = AES_BLOCK_LEN;
KASSERT(axf->blocksize == blksz, ("%s: axf block size mismatch",
__func__));
swe = &ses->swcr_encdec;
exf = swe->sw_exf;
KASSERT(axf->blocksize == exf->native_blocksize,
("%s: blocksize mismatch", __func__));
if ((crp->crp_flags & CRYPTO_F_IV_SEPARATE) == 0)
return (EINVAL);
/* Initialize the IV */
ivlen = AES_CCM_IV_LEN;
bcopy(crp->crp_iv, iv, ivlen);
/*
* AES CCM-CBC-MAC needs to know the length of both the auth
* data and payload data before doing the auth computation.
*/
ctx.aes_cbc_mac_ctx.authDataLength = crp->crp_aad_length;
ctx.aes_cbc_mac_ctx.cryptDataLength = crp->crp_payload_length;
/* Supply MAC with IV */
axf->Reinit(&ctx, iv, ivlen);
/* Supply MAC with AAD */
if (crp->crp_aad != NULL)
error = axf->Update(&ctx, crp->crp_aad, crp->crp_aad_length);
else
error = crypto_apply(crp, crp->crp_aad_start,
crp->crp_aad_length, axf->Update, &ctx);
if (error)
return (error);
if (crp->crp_cipher_key != NULL)
exf->setkey(swe->sw_kschedule, crp->crp_cipher_key,
crypto_get_params(crp->crp_session)->csp_cipher_klen);
exf->reinit(swe->sw_kschedule, iv);
/* Do encryption/decryption with MAC */
crypto_cursor_init(&cc_in, &crp->crp_buf);
crypto_cursor_advance(&cc_in, crp->crp_payload_start);
if (CRYPTO_HAS_OUTPUT_BUFFER(crp)) {
crypto_cursor_init(&cc_out, &crp->crp_obuf);
crypto_cursor_advance(&cc_out, crp->crp_payload_output_start);
} else
cc_out = cc_in;
for (resid = crp->crp_payload_length; resid >= blksz; resid -= blksz) {
if (crypto_cursor_seglen(&cc_in) < blksz) {
crypto_cursor_copydata(&cc_in, blksz, blk);
inblk = blk;
} else {
inblk = crypto_cursor_segbase(&cc_in);
crypto_cursor_advance(&cc_in, blksz);
}
if (CRYPTO_OP_IS_ENCRYPT(crp->crp_op)) {
if (crypto_cursor_seglen(&cc_out) < blksz)
outblk = blk;
else
outblk = crypto_cursor_segbase(&cc_out);
axf->Update(&ctx, inblk, blksz);
exf->encrypt(swe->sw_kschedule, inblk, outblk);
if (outblk == blk)
crypto_cursor_copyback(&cc_out, blksz, blk);
else
crypto_cursor_advance(&cc_out, blksz);
} else {
/*
* One of the problems with CCM+CBC is that
* the authentication is done on the
* unencrypted data. As a result, we have to
* decrypt the data twice: once to generate
* the tag and a second time after the tag is
* verified.
*/
exf->decrypt(swe->sw_kschedule, inblk, blk);
axf->Update(&ctx, blk, blksz);
}
}
if (resid > 0) {
crypto_cursor_copydata(&cc_in, resid, blk);
if (CRYPTO_OP_IS_ENCRYPT(crp->crp_op)) {
axf->Update(&ctx, blk, resid);
exf->encrypt_last(swe->sw_kschedule, blk, blk, resid);
crypto_cursor_copyback(&cc_out, resid, blk);
} else {
exf->decrypt_last(swe->sw_kschedule, blk, blk, resid);
axf->Update(&ctx, blk, resid);
}
}
/* Finalize MAC */
axf->Final(tag, &ctx);
/* Validate tag */
error = 0;
if (!CRYPTO_OP_IS_ENCRYPT(crp->crp_op)) {
u_char tag2[AES_CBC_MAC_HASH_LEN];
crypto_copydata(crp, crp->crp_digest_start, swa->sw_mlen,
tag2);
r = timingsafe_bcmp(tag, tag2, swa->sw_mlen);
explicit_bzero(tag2, sizeof(tag2));
if (r != 0) {
error = EBADMSG;
goto out;
}
/* tag matches, decrypt data */
exf->reinit(swe->sw_kschedule, iv);
crypto_cursor_init(&cc_in, &crp->crp_buf);
crypto_cursor_advance(&cc_in, crp->crp_payload_start);
for (resid = crp->crp_payload_length; resid > blksz;
resid -= blksz) {
if (crypto_cursor_seglen(&cc_in) < blksz) {
crypto_cursor_copydata(&cc_in, blksz, blk);
inblk = blk;
} else {
inblk = crypto_cursor_segbase(&cc_in);
crypto_cursor_advance(&cc_in, blksz);
}
if (crypto_cursor_seglen(&cc_out) < blksz)
outblk = blk;
else
outblk = crypto_cursor_segbase(&cc_out);
exf->decrypt(swe->sw_kschedule, inblk, outblk);
if (outblk == blk)
crypto_cursor_copyback(&cc_out, blksz, blk);
else
crypto_cursor_advance(&cc_out, blksz);
}
if (resid > 0) {
crypto_cursor_copydata(&cc_in, resid, blk);
exf->decrypt_last(swe->sw_kschedule, blk, blk, resid);
crypto_cursor_copyback(&cc_out, resid, blk);
}
} else {
/* Inject the authentication data */
crypto_copyback(crp, crp->crp_digest_start, swa->sw_mlen, tag);
}
out:
explicit_bzero(blkbuf, sizeof(blkbuf));
explicit_bzero(tag, sizeof(tag));
explicit_bzero(iv, sizeof(iv));
return (error);
}
static int
swcr_chacha20_poly1305(struct swcr_session *ses, struct cryptop *crp)
{
const struct crypto_session_params *csp;
uint64_t blkbuf[howmany(CHACHA20_NATIVE_BLOCK_LEN, sizeof(uint64_t))];
u_char *blk = (u_char *)blkbuf;
u_char tag[POLY1305_HASH_LEN];
struct crypto_buffer_cursor cc_in, cc_out;
const u_char *inblk;
u_char *outblk;
uint64_t *blkp;
union authctx ctx;
struct swcr_auth *swa;
struct swcr_encdec *swe;
struct auth_hash *axf;
struct enc_xform *exf;
int blksz, error, r, resid;
swa = &ses->swcr_auth;
axf = swa->sw_axf;
swe = &ses->swcr_encdec;
exf = swe->sw_exf;
blksz = exf->native_blocksize;
KASSERT(blksz <= sizeof(blkbuf), ("%s: blocksize mismatch", __func__));
if ((crp->crp_flags & CRYPTO_F_IV_SEPARATE) == 0)
return (EINVAL);
csp = crypto_get_params(crp->crp_session);
/* Generate Poly1305 key. */
if (crp->crp_cipher_key != NULL)
axf->Setkey(&ctx, crp->crp_cipher_key, csp->csp_cipher_klen);
else
axf->Setkey(&ctx, csp->csp_cipher_key, csp->csp_cipher_klen);
axf->Reinit(&ctx, crp->crp_iv, csp->csp_ivlen);
/* Supply MAC with AAD */
if (crp->crp_aad != NULL)
axf->Update(&ctx, crp->crp_aad, crp->crp_aad_length);
else
crypto_apply(crp, crp->crp_aad_start,
crp->crp_aad_length, axf->Update, &ctx);
if (crp->crp_aad_length % 16 != 0) {
/* padding1 */
memset(blk, 0, 16);
axf->Update(&ctx, blk, 16 - crp->crp_aad_length % 16);
}
if (crp->crp_cipher_key != NULL)
exf->setkey(swe->sw_kschedule, crp->crp_cipher_key,
csp->csp_cipher_klen);
exf->reinit(swe->sw_kschedule, crp->crp_iv);
/* Do encryption with MAC */
crypto_cursor_init(&cc_in, &crp->crp_buf);
crypto_cursor_advance(&cc_in, crp->crp_payload_start);
if (CRYPTO_HAS_OUTPUT_BUFFER(crp)) {
crypto_cursor_init(&cc_out, &crp->crp_obuf);
crypto_cursor_advance(&cc_out, crp->crp_payload_output_start);
} else
cc_out = cc_in;
for (resid = crp->crp_payload_length; resid >= blksz; resid -= blksz) {
if (crypto_cursor_seglen(&cc_in) < blksz) {
crypto_cursor_copydata(&cc_in, blksz, blk);
inblk = blk;
} else {
inblk = crypto_cursor_segbase(&cc_in);
crypto_cursor_advance(&cc_in, blksz);
}
if (CRYPTO_OP_IS_ENCRYPT(crp->crp_op)) {
if (crypto_cursor_seglen(&cc_out) < blksz)
outblk = blk;
else
outblk = crypto_cursor_segbase(&cc_out);
exf->encrypt(swe->sw_kschedule, inblk, outblk);
axf->Update(&ctx, outblk, blksz);
if (outblk == blk)
crypto_cursor_copyback(&cc_out, blksz, blk);
else
crypto_cursor_advance(&cc_out, blksz);
} else {
axf->Update(&ctx, inblk, blksz);
}
}
if (resid > 0) {
crypto_cursor_copydata(&cc_in, resid, blk);
if (CRYPTO_OP_IS_ENCRYPT(crp->crp_op)) {
exf->encrypt_last(swe->sw_kschedule, blk, blk, resid);
crypto_cursor_copyback(&cc_out, resid, blk);
}
axf->Update(&ctx, blk, resid);
if (resid % 16 != 0) {
/* padding2 */
memset(blk, 0, 16);
axf->Update(&ctx, blk, 16 - resid % 16);
}
}
/* lengths */
blkp = (uint64_t *)blk;
blkp[0] = htole64(crp->crp_aad_length);
blkp[1] = htole64(crp->crp_payload_length);
axf->Update(&ctx, blk, sizeof(uint64_t) * 2);
/* Finalize MAC */
axf->Final(tag, &ctx);
/* Validate tag */
error = 0;
if (!CRYPTO_OP_IS_ENCRYPT(crp->crp_op)) {
u_char tag2[POLY1305_HASH_LEN];
crypto_copydata(crp, crp->crp_digest_start, swa->sw_mlen, tag2);
r = timingsafe_bcmp(tag, tag2, swa->sw_mlen);
explicit_bzero(tag2, sizeof(tag2));
if (r != 0) {
error = EBADMSG;
goto out;
}
/* tag matches, decrypt data */
crypto_cursor_init(&cc_in, &crp->crp_buf);