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freebsd-dev/sys/opencrypto/cryptosoft.c
Sam Leffler 091d81d134 In-kernel crypto framework derived from openbsd. This facility provides 
a consistent interface to h/w and s/w crypto algorithms for use by the
kernel and (for h/w at least) by user-mode apps.  Access for user-level
code is through a /dev/crypto device that'll eventually be used by openssl
to (potentially) accelerate many applications.  Coming soon is an IPsec
that makes use of this service to accelerate ESP, AH, and IPCOMP protocols.

Included here is the "core" crypto support, /dev/crypto driver, various
crypto algorithms that are not already present in the KAME crypto area,
and support routines used by crypto device drivers.

Obtained from:	openbsd
2002-10-04 20:31:23 +00:00

1026 lines
24 KiB
C
Raw Blame History

/* $FreeBSD$ */
/* $OpenBSD: cryptosoft.c,v 1.35 2002/04/26 08:43:50 deraadt Exp $ */
/*
* The author of this code is Angelos D. Keromytis (angelos@cis.upenn.edu)
*
* 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
*
* 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/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/sysctl.h>
#include <sys/errno.h>
#include <sys/random.h>
#include <sys/kernel.h>
#include <sys/uio.h>
#include <crypto/blowfish/blowfish.h>
#include <crypto/cast128/cast128.h>
#include <crypto/sha1.h>
#include <opencrypto/rmd160.h>
#include <opencrypto/skipjack.h>
#include <sys/md5.h>
#include <opencrypto/cryptodev.h>
#include <opencrypto/cryptosoft.h>
#include <opencrypto/xform.h>
u_int8_t hmac_ipad_buffer[64] = {
0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,
0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,
0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,
0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,
0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,
0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,
0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,
0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36
};
u_int8_t hmac_opad_buffer[64] = {
0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C,
0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C,
0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C,
0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C,
0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C,
0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C,
0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C,
0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C
};
struct swcr_data **swcr_sessions = NULL;
u_int32_t swcr_sesnum = 0;
int32_t swcr_id = -1;
#define COPYBACK(x, a, b, c, d) \
(x) == CRYPTO_BUF_MBUF ? m_copyback((struct mbuf *)a,b,c,d) \
: cuio_copyback((struct uio *)a,b,c,d)
#define COPYDATA(x, a, b, c, d) \
(x) == CRYPTO_BUF_MBUF ? m_copydata((struct mbuf *)a,b,c,d) \
: cuio_copydata((struct uio *)a,b,c,d)
static int swcr_encdec(struct cryptodesc *, struct swcr_data *, caddr_t, int);
static int swcr_authcompute(struct cryptop *crp, struct cryptodesc *crd,
struct swcr_data *sw, caddr_t buf, int outtype);
static int swcr_compdec(struct cryptodesc *, struct swcr_data *, caddr_t, int);
static int swcr_process(void *, struct cryptop *, int);
static int swcr_newsession(void *, u_int32_t *, struct cryptoini *);
static int swcr_freesession(void *, u_int64_t);
/*
* NB: These came over from openbsd and are kept private
* to the crypto code for now.
*/
extern int m_apply(struct mbuf *m, int off, int len,
int (*f)(caddr_t, caddr_t, unsigned int), caddr_t fstate);
/*
* Apply a symmetric encryption/decryption algorithm.
*/
static int
swcr_encdec(struct cryptodesc *crd, struct swcr_data *sw, caddr_t buf,
int outtype)
{
unsigned char iv[EALG_MAX_BLOCK_LEN], blk[EALG_MAX_BLOCK_LEN], *idat;
unsigned char *ivp, piv[EALG_MAX_BLOCK_LEN];
struct enc_xform *exf;
int i, k, j, blks;
exf = sw->sw_exf;
blks = exf->blocksize;
/* Check for non-padded data */
if (crd->crd_len % blks)
return EINVAL;
/* Initialize the IV */
if (crd->crd_flags & CRD_F_ENCRYPT) {
/* IV explicitly provided ? */
if (crd->crd_flags & CRD_F_IV_EXPLICIT)
bcopy(crd->crd_iv, iv, blks);
else {
/* Get random IV */
for (i = 0;
i + sizeof (u_int32_t) < EALG_MAX_BLOCK_LEN;
i += sizeof (u_int32_t)) {
u_int32_t temp = arc4random();
bcopy(&temp, iv + i, sizeof(u_int32_t));
}
/*
* What if the block size is not a multiple
* of sizeof (u_int32_t), which is the size of
* what arc4random() returns ?
*/
if (EALG_MAX_BLOCK_LEN % sizeof (u_int32_t) != 0) {
u_int32_t temp = arc4random();
bcopy (&temp, iv + i,
EALG_MAX_BLOCK_LEN - i);
}
}
/* Do we need to write the IV */
if (!(crd->crd_flags & CRD_F_IV_PRESENT)) {
COPYBACK(outtype, buf, crd->crd_inject, blks, iv);
}
} else { /* Decryption */
/* IV explicitly provided ? */
if (crd->crd_flags & CRD_F_IV_EXPLICIT)
bcopy(crd->crd_iv, iv, blks);
else {
/* Get IV off buf */
COPYDATA(outtype, buf, crd->crd_inject, blks, iv);
}
}
ivp = iv;
if (outtype == CRYPTO_BUF_CONTIG) {
if (crd->crd_flags & CRD_F_ENCRYPT) {
for (i = crd->crd_skip;
i < crd->crd_skip + crd->crd_len; i += blks) {
/* XOR with the IV/previous block, as appropriate. */
if (i == crd->crd_skip)
for (k = 0; k < blks; k++)
buf[i + k] ^= ivp[k];
else
for (k = 0; k < blks; k++)
buf[i + k] ^= buf[i + k - blks];
exf->encrypt(sw->sw_kschedule, buf + i);
}
} else { /* Decrypt */
/*
* Start at the end, so we don't need to keep the encrypted
* block as the IV for the next block.
*/
for (i = crd->crd_skip + crd->crd_len - blks;
i >= crd->crd_skip; i -= blks) {
exf->decrypt(sw->sw_kschedule, buf + i);
/* XOR with the IV/previous block, as appropriate */
if (i == crd->crd_skip)
for (k = 0; k < blks; k++)
buf[i + k] ^= ivp[k];
else
for (k = 0; k < blks; k++)
buf[i + k] ^= buf[i + k - blks];
}
}
return 0;
} else if (outtype == CRYPTO_BUF_MBUF) {
struct mbuf *m = (struct mbuf *) buf;
/* Find beginning of data */
m = m_getptr(m, crd->crd_skip, &k);
if (m == NULL)
return EINVAL;
i = crd->crd_len;
while (i > 0) {
/*
* If there's insufficient data at the end of
* an mbuf, we have to do some copying.
*/
if (m->m_len < k + blks && m->m_len != k) {
m_copydata(m, k, blks, blk);
/* Actual encryption/decryption */
if (crd->crd_flags & CRD_F_ENCRYPT) {
/* XOR with previous block */
for (j = 0; j < blks; j++)
blk[j] ^= ivp[j];
exf->encrypt(sw->sw_kschedule, blk);
/*
* Keep encrypted block for XOR'ing
* with next block
*/
bcopy(blk, iv, blks);
ivp = iv;
} else { /* decrypt */
/*
* Keep encrypted block for XOR'ing
* with next block
*/
if (ivp == iv)
bcopy(blk, piv, blks);
else
bcopy(blk, iv, blks);
exf->decrypt(sw->sw_kschedule, blk);
/* XOR with previous block */
for (j = 0; j < blks; j++)
blk[j] ^= ivp[j];
if (ivp == iv)
bcopy(piv, iv, blks);
else
ivp = iv;
}
/* Copy back decrypted block */
m_copyback(m, k, blks, blk);
/* Advance pointer */
m = m_getptr(m, k + blks, &k);
if (m == NULL)
return EINVAL;
i -= blks;
/* Could be done... */
if (i == 0)
break;
}
/* Skip possibly empty mbufs */
if (k == m->m_len) {
for (m = m->m_next; m && m->m_len == 0;
m = m->m_next)
;
k = 0;
}
/* Sanity check */
if (m == NULL)
return EINVAL;
/*
* Warning: idat may point to garbage here, but
* we only use it in the while() loop, only if
* there are indeed enough data.
*/
idat = mtod(m, unsigned char *) + k;
while (m->m_len >= k + blks && i > 0) {
if (crd->crd_flags & CRD_F_ENCRYPT) {
/* XOR with previous block/IV */
for (j = 0; j < blks; j++)
idat[j] ^= ivp[j];
exf->encrypt(sw->sw_kschedule, idat);
ivp = idat;
} else { /* decrypt */
/*
* Keep encrypted block to be used
* in next block's processing.
*/
if (ivp == iv)
bcopy(idat, piv, blks);
else
bcopy(idat, iv, blks);
exf->decrypt(sw->sw_kschedule, idat);
/* XOR with previous block/IV */
for (j = 0; j < blks; j++)
idat[j] ^= ivp[j];
if (ivp == iv)
bcopy(piv, iv, blks);
else
ivp = iv;
}
idat += blks;
k += blks;
i -= blks;
}
}
return 0; /* Done with mbuf encryption/decryption */
} else if (outtype == CRYPTO_BUF_IOV) {
struct uio *uio = (struct uio *) buf;
struct iovec *iov;
/* Find beginning of data */
iov = cuio_getptr(uio, crd->crd_skip, &k);
if (iov == NULL)
return EINVAL;
i = crd->crd_len;
while (i > 0) {
/*
* If there's insufficient data at the end of
* an iovec, we have to do some copying.
*/
if (iov->iov_len < k + blks && iov->iov_len != k) {
cuio_copydata(uio, k, blks, blk);
/* Actual encryption/decryption */
if (crd->crd_flags & CRD_F_ENCRYPT) {
/* XOR with previous block */
for (j = 0; j < blks; j++)
blk[j] ^= ivp[j];
exf->encrypt(sw->sw_kschedule, blk);
/*
* Keep encrypted block for XOR'ing
* with next block
*/
bcopy(blk, iv, blks);
ivp = iv;
} else { /* decrypt */
/*
* Keep encrypted block for XOR'ing
* with next block
*/
if (ivp == iv)
bcopy(blk, piv, blks);
else
bcopy(blk, iv, blks);
exf->decrypt(sw->sw_kschedule, blk);
/* XOR with previous block */
for (j = 0; j < blks; j++)
blk[j] ^= ivp[j];
if (ivp == iv)
bcopy(piv, iv, blks);
else
ivp = iv;
}
/* Copy back decrypted block */
cuio_copyback(uio, k, blks, blk);
/* Advance pointer */
iov = cuio_getptr(uio, k + blks, &k);
if (iov == NULL)
return EINVAL;
i -= blks;
/* Could be done... */
if (i == 0)
break;
}
/*
* Warning: idat may point to garbage here, but
* we only use it in the while() loop, only if
* there are indeed enough data.
*/
idat = iov->iov_base + k;
while (iov->iov_len >= k + blks && i > 0) {
if (crd->crd_flags & CRD_F_ENCRYPT) {
/* XOR with previous block/IV */
for (j = 0; j < blks; j++)
idat[j] ^= ivp[j];
exf->encrypt(sw->sw_kschedule, idat);
ivp = idat;
} else { /* decrypt */
/*
* Keep encrypted block to be used
* in next block's processing.
*/
if (ivp == iv)
bcopy(idat, piv, blks);
else
bcopy(idat, iv, blks);
exf->decrypt(sw->sw_kschedule, idat);
/* XOR with previous block/IV */
for (j = 0; j < blks; j++)
idat[j] ^= ivp[j];
if (ivp == iv)
bcopy(piv, iv, blks);
else
ivp = iv;
}
idat += blks;
k += blks;
i -= blks;
}
}
return 0; /* Done with mbuf encryption/decryption */
}
/* Unreachable */
return EINVAL;
}
/*
* Compute keyed-hash authenticator.
*/
static int
swcr_authcompute(struct cryptop *crp, struct cryptodesc *crd,
struct swcr_data *sw, caddr_t buf, int outtype)
{
unsigned char aalg[AALG_MAX_RESULT_LEN];
struct auth_hash *axf;
union authctx ctx;
int err;
if (sw->sw_ictx == 0)
return EINVAL;
axf = sw->sw_axf;
bcopy(sw->sw_ictx, &ctx, axf->ctxsize);
switch (outtype) {
case CRYPTO_BUF_CONTIG:
axf->Update(&ctx, buf + crd->crd_skip, crd->crd_len);
break;
case CRYPTO_BUF_MBUF:
err = m_apply((struct mbuf *) buf, crd->crd_skip, crd->crd_len,
(int (*)(caddr_t, caddr_t, unsigned int)) axf->Update,
(caddr_t) &ctx);
if (err)
return err;
break;
case CRYPTO_BUF_IOV:
default:
return EINVAL;
}
switch (sw->sw_alg) {
case CRYPTO_MD5_HMAC:
case CRYPTO_SHA1_HMAC:
case CRYPTO_SHA2_HMAC:
case CRYPTO_RIPEMD160_HMAC:
if (sw->sw_octx == NULL)
return EINVAL;
axf->Final(aalg, &ctx);
bcopy(sw->sw_octx, &ctx, axf->ctxsize);
axf->Update(&ctx, aalg, axf->hashsize);
axf->Final(aalg, &ctx);
break;
case CRYPTO_MD5_KPDK:
case CRYPTO_SHA1_KPDK:
if (sw->sw_octx == NULL)
return EINVAL;
axf->Update(&ctx, sw->sw_octx, sw->sw_klen);
axf->Final(aalg, &ctx);
break;
case CRYPTO_NULL_HMAC:
axf->Final(aalg, &ctx);
break;
}
/* Inject the authentication data */
if (outtype == CRYPTO_BUF_CONTIG)
bcopy(aalg, buf + crd->crd_inject, axf->authsize);
else
m_copyback((struct mbuf *) buf, crd->crd_inject,
axf->authsize, aalg);
return 0;
}
/*
* Apply a compression/decompression algorithm
*/
static int
swcr_compdec(struct cryptodesc *crd, struct swcr_data *sw,
caddr_t buf, int outtype)
{
u_int8_t *data, *out;
struct comp_algo *cxf;
int adj;
u_int32_t result;
cxf = sw->sw_cxf;
/* We must handle the whole buffer of data in one time
* then if there is not all the data in the mbuf, we must
* copy in a buffer.
*/
MALLOC(data, u_int8_t *, crd->crd_len, M_CRYPTO_DATA, M_NOWAIT);
if (data == NULL)
return (EINVAL);
COPYDATA(outtype, buf, crd->crd_skip, crd->crd_len, data);
if (crd->crd_flags & CRD_F_COMP)
result = cxf->compress(data, crd->crd_len, &out);
else
result = cxf->decompress(data, crd->crd_len, &out);
FREE(data, M_CRYPTO_DATA);
if (result == 0)
return EINVAL;
/* Copy back the (de)compressed data. m_copyback is
* extending the mbuf as necessary.
*/
sw->sw_size = result;
/* Check the compressed size when doing compression */
if (crd->crd_flags & CRD_F_COMP) {
if (result > crd->crd_len) {
/* Compression was useless, we lost time */
FREE(out, M_CRYPTO_DATA);
return 0;
}
}
COPYBACK(outtype, buf, crd->crd_skip, result, out);
if (result < crd->crd_len) {
adj = result - crd->crd_len;
if (outtype == CRYPTO_BUF_MBUF) {
adj = result - crd->crd_len;
m_adj((struct mbuf *)buf, adj);
} else {
struct uio *uio = (struct uio *)buf;
int ind;
adj = crd->crd_len - result;
ind = uio->uio_iovcnt - 1;
while (adj > 0 && ind >= 0) {
if (adj < uio->uio_iov[ind].iov_len) {
uio->uio_iov[ind].iov_len -= adj;
break;
}
adj -= uio->uio_iov[ind].iov_len;
uio->uio_iov[ind].iov_len = 0;
ind--;
uio->uio_iovcnt--;
}
}
}
FREE(out, M_CRYPTO_DATA);
return 0;
}
/*
* Generate a new software session.
*/
static int
swcr_newsession(void *arg, u_int32_t *sid, struct cryptoini *cri)
{
struct swcr_data **swd;
struct auth_hash *axf;
struct enc_xform *txf;
struct comp_algo *cxf;
u_int32_t i;
int k, error;
if (sid == NULL || cri == NULL)
return EINVAL;
if (swcr_sessions) {
for (i = 1; i < swcr_sesnum; i++)
if (swcr_sessions[i] == NULL)
break;
} else
i = 1; /* NB: to silence compiler warning */
if (swcr_sessions == NULL || i == swcr_sesnum) {
if (swcr_sessions == NULL) {
i = 1; /* We leave swcr_sessions[0] empty */
swcr_sesnum = CRYPTO_SW_SESSIONS;
} else
swcr_sesnum *= 2;
swd = malloc(swcr_sesnum * sizeof(struct swcr_data *),
M_CRYPTO_DATA, M_NOWAIT|M_ZERO);
if (swd == NULL) {
/* Reset session number */
if (swcr_sesnum == CRYPTO_SW_SESSIONS)
swcr_sesnum = 0;
else
swcr_sesnum /= 2;
return ENOBUFS;
}
/* Copy existing sessions */
if (swcr_sessions) {
bcopy(swcr_sessions, swd,
(swcr_sesnum / 2) * sizeof(struct swcr_data *));
free(swcr_sessions, M_CRYPTO_DATA);
}
swcr_sessions = swd;
}
swd = &swcr_sessions[i];
*sid = i;
while (cri) {
MALLOC(*swd, struct swcr_data *, sizeof(struct swcr_data),
M_CRYPTO_DATA, M_NOWAIT|M_ZERO);
if (*swd == NULL) {
swcr_freesession(NULL, i);
return ENOBUFS;
}
switch (cri->cri_alg) {
case CRYPTO_DES_CBC:
txf = &enc_xform_des;
goto enccommon;
case CRYPTO_3DES_CBC:
txf = &enc_xform_3des;
goto enccommon;
case CRYPTO_BLF_CBC:
txf = &enc_xform_blf;
goto enccommon;
case CRYPTO_CAST_CBC:
txf = &enc_xform_cast5;
goto enccommon;
case CRYPTO_SKIPJACK_CBC:
txf = &enc_xform_skipjack;
goto enccommon;
case CRYPTO_RIJNDAEL128_CBC:
txf = &enc_xform_rijndael128;
goto enccommon;
case CRYPTO_NULL_CBC:
txf = &enc_xform_null;
goto enccommon;
enccommon:
error = txf->setkey(&((*swd)->sw_kschedule),
cri->cri_key, cri->cri_klen / 8);
if (error) {
swcr_freesession(NULL, i);
return error;
}
(*swd)->sw_exf = txf;
break;
case CRYPTO_MD5_HMAC:
axf = &auth_hash_hmac_md5_96;
goto authcommon;
case CRYPTO_SHA1_HMAC:
axf = &auth_hash_hmac_sha1_96;
goto authcommon;
case CRYPTO_SHA2_HMAC:
if (cri->cri_klen == 256)
axf = &auth_hash_hmac_sha2_256;
else if (cri->cri_klen == 384)
axf = &auth_hash_hmac_sha2_384;
else if (cri->cri_klen == 512)
axf = &auth_hash_hmac_sha2_512;
else {
swcr_freesession(NULL, i);
return EINVAL;
}
goto authcommon;
case CRYPTO_NULL_HMAC:
axf = &auth_hash_null;
goto authcommon;
case CRYPTO_RIPEMD160_HMAC:
axf = &auth_hash_hmac_ripemd_160_96;
authcommon:
(*swd)->sw_ictx = malloc(axf->ctxsize, M_CRYPTO_DATA,
M_NOWAIT);
if ((*swd)->sw_ictx == NULL) {
swcr_freesession(NULL, i);
return ENOBUFS;
}
(*swd)->sw_octx = malloc(axf->ctxsize, M_CRYPTO_DATA,
M_NOWAIT);
if ((*swd)->sw_octx == NULL) {
swcr_freesession(NULL, i);
return ENOBUFS;
}
for (k = 0; k < cri->cri_klen / 8; k++)
cri->cri_key[k] ^= HMAC_IPAD_VAL;
axf->Init((*swd)->sw_ictx);
axf->Update((*swd)->sw_ictx, cri->cri_key,
cri->cri_klen / 8);
axf->Update((*swd)->sw_ictx, hmac_ipad_buffer,
HMAC_BLOCK_LEN - (cri->cri_klen / 8));
for (k = 0; k < cri->cri_klen / 8; k++)
cri->cri_key[k] ^= (HMAC_IPAD_VAL ^ HMAC_OPAD_VAL);
axf->Init((*swd)->sw_octx);
axf->Update((*swd)->sw_octx, cri->cri_key,
cri->cri_klen / 8);
axf->Update((*swd)->sw_octx, hmac_opad_buffer,
HMAC_BLOCK_LEN - (cri->cri_klen / 8));
for (k = 0; k < cri->cri_klen / 8; k++)
cri->cri_key[k] ^= HMAC_OPAD_VAL;
(*swd)->sw_axf = axf;
break;
case CRYPTO_MD5_KPDK:
axf = &auth_hash_key_md5;
goto auth2common;
case CRYPTO_SHA1_KPDK:
axf = &auth_hash_key_sha1;
auth2common:
(*swd)->sw_ictx = malloc(axf->ctxsize, M_CRYPTO_DATA,
M_NOWAIT);
if ((*swd)->sw_ictx == NULL) {
swcr_freesession(NULL, i);
return ENOBUFS;
}
/* Store the key so we can "append" it to the payload */
(*swd)->sw_octx = malloc(cri->cri_klen / 8, M_CRYPTO_DATA,
M_NOWAIT);
if ((*swd)->sw_octx == NULL) {
swcr_freesession(NULL, i);
return ENOBUFS;
}
(*swd)->sw_klen = cri->cri_klen / 8;
bcopy(cri->cri_key, (*swd)->sw_octx, cri->cri_klen / 8);
axf->Init((*swd)->sw_ictx);
axf->Update((*swd)->sw_ictx, cri->cri_key,
cri->cri_klen / 8);
axf->Final(NULL, (*swd)->sw_ictx);
(*swd)->sw_axf = axf;
break;
#ifdef notdef
case CRYPTO_MD5:
axf = &auth_hash_md5;
goto auth3common;
case CRYPTO_SHA1:
axf = &auth_hash_sha1;
auth3common:
(*swd)->sw_ictx = malloc(axf->ctxsize, M_CRYPTO_DATA,
M_NOWAIT);
if ((*swd)->sw_ictx == NULL) {
swcr_freesession(NULL, i);
return ENOBUFS;
}
axf->Init((*swd)->sw_ictx);
(*swd)->sw_axf = axf;
break;
#endif
case CRYPTO_DEFLATE_COMP:
cxf = &comp_algo_deflate;
(*swd)->sw_cxf = cxf;
break;
default:
swcr_freesession(NULL, i);
return EINVAL;
}
(*swd)->sw_alg = cri->cri_alg;
cri = cri->cri_next;
swd = &((*swd)->sw_next);
}
return 0;
}
/*
* Free a session.
*/
static int
swcr_freesession(void *arg, u_int64_t tid)
{
struct swcr_data *swd;
struct enc_xform *txf;
struct auth_hash *axf;
struct comp_algo *cxf;
u_int32_t sid = ((u_int32_t) tid) & 0xffffffff;
if (sid > swcr_sesnum || swcr_sessions == NULL ||
swcr_sessions[sid] == NULL)
return EINVAL;
/* Silently accept and return */
if (sid == 0)
return 0;
while ((swd = swcr_sessions[sid]) != NULL) {
swcr_sessions[sid] = swd->sw_next;
switch (swd->sw_alg) {
case CRYPTO_DES_CBC:
case CRYPTO_3DES_CBC:
case CRYPTO_BLF_CBC:
case CRYPTO_CAST_CBC:
case CRYPTO_SKIPJACK_CBC:
case CRYPTO_RIJNDAEL128_CBC:
case CRYPTO_NULL_CBC:
txf = swd->sw_exf;
if (swd->sw_kschedule)
txf->zerokey(&(swd->sw_kschedule));
break;
case CRYPTO_MD5_HMAC:
case CRYPTO_SHA1_HMAC:
case CRYPTO_SHA2_HMAC:
case CRYPTO_RIPEMD160_HMAC:
case CRYPTO_NULL_HMAC:
axf = swd->sw_axf;
if (swd->sw_ictx) {
bzero(swd->sw_ictx, axf->ctxsize);
free(swd->sw_ictx, M_CRYPTO_DATA);
}
if (swd->sw_octx) {
bzero(swd->sw_octx, axf->ctxsize);
free(swd->sw_octx, M_CRYPTO_DATA);
}
break;
case CRYPTO_MD5_KPDK:
case CRYPTO_SHA1_KPDK:
axf = swd->sw_axf;
if (swd->sw_ictx) {
bzero(swd->sw_ictx, axf->ctxsize);
free(swd->sw_ictx, M_CRYPTO_DATA);
}
if (swd->sw_octx) {
bzero(swd->sw_octx, swd->sw_klen);
free(swd->sw_octx, M_CRYPTO_DATA);
}
break;
case CRYPTO_MD5:
case CRYPTO_SHA1:
axf = swd->sw_axf;
if (swd->sw_ictx)
free(swd->sw_ictx, M_CRYPTO_DATA);
break;
case CRYPTO_DEFLATE_COMP:
cxf = swd->sw_cxf;
break;
}
FREE(swd, M_CRYPTO_DATA);
}
return 0;
}
/*
* Process a software request.
*/
static int
swcr_process(void *arg, struct cryptop *crp, int hint)
{
struct cryptodesc *crd;
struct swcr_data *sw;
u_int32_t lid;
int type;
/* Sanity check */
if (crp == NULL)
return EINVAL;
if (crp->crp_desc == NULL || crp->crp_buf == NULL) {
crp->crp_etype = EINVAL;
goto done;
}
lid = crp->crp_sid & 0xffffffff;
if (lid >= swcr_sesnum || lid == 0 || swcr_sessions[lid] == NULL) {
crp->crp_etype = ENOENT;
goto done;
}
if (crp->crp_flags & CRYPTO_F_IMBUF) {
type = CRYPTO_BUF_MBUF;
} else if (crp->crp_flags & CRYPTO_F_IOV) {
type = CRYPTO_BUF_IOV;
} else {
type = CRYPTO_BUF_CONTIG;
}
/* Go through crypto descriptors, processing as we go */
for (crd = crp->crp_desc; crd; crd = crd->crd_next) {
/*
* Find the crypto context.
*
* XXX Note that the logic here prevents us from having
* XXX the same algorithm multiple times in a session
* XXX (or rather, we can but it won't give us the right
* XXX results). To do that, we'd need some way of differentiating
* XXX between the various instances of an algorithm (so we can
* XXX locate the correct crypto context).
*/
for (sw = swcr_sessions[lid];
sw && sw->sw_alg != crd->crd_alg;
sw = sw->sw_next)
;
/* No such context ? */
if (sw == NULL) {
crp->crp_etype = EINVAL;
goto done;
}
switch (sw->sw_alg) {
case CRYPTO_DES_CBC:
case CRYPTO_3DES_CBC:
case CRYPTO_BLF_CBC:
case CRYPTO_CAST_CBC:
case CRYPTO_SKIPJACK_CBC:
case CRYPTO_RIJNDAEL128_CBC:
if ((crp->crp_etype = swcr_encdec(crd, sw,
crp->crp_buf, type)) != 0)
goto done;
break;
case CRYPTO_NULL_CBC:
crp->crp_etype = 0;
break;
case CRYPTO_MD5_HMAC:
case CRYPTO_SHA1_HMAC:
case CRYPTO_SHA2_HMAC:
case CRYPTO_RIPEMD160_HMAC:
case CRYPTO_NULL_HMAC:
case CRYPTO_MD5_KPDK:
case CRYPTO_SHA1_KPDK:
case CRYPTO_MD5:
case CRYPTO_SHA1:
if ((crp->crp_etype = swcr_authcompute(crp, crd, sw,
crp->crp_buf, type)) != 0)
goto done;
break;
case CRYPTO_DEFLATE_COMP:
if ((crp->crp_etype = swcr_compdec(crd, sw,
crp->crp_buf, type)) != 0)
goto done;
else
crp->crp_olen = (int)sw->sw_size;
break;
default:
/* Unknown/unsupported algorithm */
crp->crp_etype = EINVAL;
goto done;
}
}
done:
crypto_done(crp);
return 0;
}
/*
* Initialize the driver, called from the kernel main().
*/
static void
swcr_init(void)
{
swcr_id = crypto_get_driverid(CRYPTOCAP_F_SOFTWARE);
if (swcr_id < 0)
panic("Software crypto device cannot initialize!");
crypto_register(swcr_id, CRYPTO_DES_CBC,
0, 0, swcr_newsession, swcr_freesession, swcr_process, NULL);
#define REGISTER(alg) \
crypto_register(swcr_id, alg, 0,0,NULL,NULL,NULL,NULL)
REGISTER(CRYPTO_3DES_CBC);
REGISTER(CRYPTO_BLF_CBC);
REGISTER(CRYPTO_CAST_CBC);
REGISTER(CRYPTO_SKIPJACK_CBC);
REGISTER(CRYPTO_NULL_CBC);
REGISTER(CRYPTO_MD5_HMAC);
REGISTER(CRYPTO_SHA1_HMAC);
REGISTER(CRYPTO_SHA2_HMAC);
REGISTER(CRYPTO_RIPEMD160_HMAC);
REGISTER(CRYPTO_NULL_HMAC);
REGISTER(CRYPTO_MD5_KPDK);
REGISTER(CRYPTO_SHA1_KPDK);
REGISTER(CRYPTO_MD5);
REGISTER(CRYPTO_SHA1);
REGISTER(CRYPTO_RIJNDAEL128_CBC);
REGISTER(CRYPTO_DEFLATE_COMP);
#undef REGISTER
}
SYSINIT(cryptosoft_init, SI_SUB_PSEUDO, SI_ORDER_ANY, swcr_init, NULL)
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