/* $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) * 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 __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "cryptodev_if.h" static int32_t swcr_id; static struct swcr_data **swcr_sessions = NULL; static u_int32_t swcr_sesnum; /* Protects swcr_sessions pointer, not data. */ static struct rwlock swcr_sessions_lock; u_int8_t hmac_ipad_buffer[HMAC_MAX_BLOCK_LEN]; u_int8_t hmac_opad_buffer[HMAC_MAX_BLOCK_LEN]; static int swcr_encdec(struct cryptodesc *, struct swcr_data *, caddr_t, int); static int swcr_authcompute(struct cryptodesc *, struct swcr_data *, caddr_t, int); static int swcr_authenc(struct cryptop *crp); static int swcr_compdec(struct cryptodesc *, struct swcr_data *, caddr_t, int); static int swcr_freesession(device_t dev, u_int64_t tid); static int swcr_freesession_locked(device_t dev, u_int64_t tid); /* * Apply a symmetric encryption/decryption algorithm. */ static int swcr_encdec(struct cryptodesc *crd, struct swcr_data *sw, caddr_t buf, int flags) { unsigned char iv[EALG_MAX_BLOCK_LEN], blk[EALG_MAX_BLOCK_LEN], *idat; unsigned char *ivp, *nivp, iv2[EALG_MAX_BLOCK_LEN]; struct enc_xform *exf; int i, j, k, blks, ind, count, ivlen; struct uio *uio, uiolcl; struct iovec iovlcl[4]; struct iovec *iov; int iovcnt, iovalloc; int error; error = 0; exf = sw->sw_exf; blks = exf->blocksize; ivlen = exf->ivsize; /* Check for non-padded data */ if (crd->crd_len % blks) return EINVAL; if (crd->crd_alg == CRYPTO_AES_ICM && (crd->crd_flags & CRD_F_IV_EXPLICIT) == 0) 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, ivlen); else arc4rand(iv, ivlen, 0); /* Do we need to write the IV */ if (!(crd->crd_flags & CRD_F_IV_PRESENT)) crypto_copyback(flags, buf, crd->crd_inject, ivlen, iv); } else { /* Decryption */ /* IV explicitly provided ? */ if (crd->crd_flags & CRD_F_IV_EXPLICIT) bcopy(crd->crd_iv, iv, ivlen); else { /* Get IV off buf */ crypto_copydata(flags, buf, crd->crd_inject, ivlen, iv); } } if (crd->crd_flags & CRD_F_KEY_EXPLICIT) { int error; if (sw->sw_kschedule) exf->zerokey(&(sw->sw_kschedule)); error = exf->setkey(&sw->sw_kschedule, crd->crd_key, crd->crd_klen / 8); if (error) return (error); } iov = iovlcl; iovcnt = nitems(iovlcl); iovalloc = 0; uio = &uiolcl; if ((flags & CRYPTO_F_IMBUF) != 0) { error = crypto_mbuftoiov((struct mbuf *)buf, &iov, &iovcnt, &iovalloc); if (error) return (error); uio->uio_iov = iov; uio->uio_iovcnt = iovcnt; } else if ((flags & CRYPTO_F_IOV) != 0) uio = (struct uio *)buf; else { iov[0].iov_base = buf; iov[0].iov_len = crd->crd_skip + crd->crd_len; uio->uio_iov = iov; uio->uio_iovcnt = 1; } ivp = iv; if (exf->reinit) { /* * xforms that provide a reinit method perform all IV * handling themselves. */ exf->reinit(sw->sw_kschedule, iv); } count = crd->crd_skip; ind = cuio_getptr(uio, count, &k); if (ind == -1) { error = EINVAL; goto out; } 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 (uio->uio_iov[ind].iov_len < k + blks && uio->uio_iov[ind].iov_len != k) { cuio_copydata(uio, count, blks, blk); /* Actual encryption/decryption */ if (exf->reinit) { if (crd->crd_flags & CRD_F_ENCRYPT) { exf->encrypt(sw->sw_kschedule, blk); } else { exf->decrypt(sw->sw_kschedule, blk); } } else 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 */ nivp = (ivp == iv) ? iv2 : iv; bcopy(blk, nivp, blks); exf->decrypt(sw->sw_kschedule, blk); /* XOR with previous block */ for (j = 0; j < blks; j++) blk[j] ^= ivp[j]; ivp = nivp; } /* Copy back decrypted block */ cuio_copyback(uio, count, blks, blk); count += blks; /* Advance pointer */ ind = cuio_getptr(uio, count, &k); if (ind == -1) { error = EINVAL; goto out; } 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 = (char *)uio->uio_iov[ind].iov_base + k; while (uio->uio_iov[ind].iov_len >= k + blks && i > 0) { if (exf->reinit) { if (crd->crd_flags & CRD_F_ENCRYPT) { exf->encrypt(sw->sw_kschedule, idat); } else { exf->decrypt(sw->sw_kschedule, idat); } } else 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. */ nivp = (ivp == iv) ? iv2 : iv; bcopy(idat, nivp, blks); exf->decrypt(sw->sw_kschedule, idat); /* XOR with previous block/IV */ for (j = 0; j < blks; j++) idat[j] ^= ivp[j]; ivp = nivp; } idat += blks; count += blks; k += blks; i -= blks; } /* * Advance to the next iov if the end of the current iov * is aligned with the end of a cipher block. * Note that the code is equivalent to calling: * ind = cuio_getptr(uio, count, &k); */ if (i > 0 && k == uio->uio_iov[ind].iov_len) { k = 0; ind++; if (ind >= uio->uio_iovcnt) { error = EINVAL; goto out; } } } out: if (iovalloc) free(iov, M_CRYPTO_DATA); return (error); } static void swcr_authprepare(struct auth_hash *axf, struct swcr_data *sw, u_char *key, int klen) { int k; klen /= 8; switch (axf->type) { case CRYPTO_MD5_HMAC: case CRYPTO_SHA1_HMAC: case CRYPTO_SHA2_256_HMAC: case CRYPTO_SHA2_384_HMAC: case CRYPTO_SHA2_512_HMAC: case CRYPTO_NULL_HMAC: case CRYPTO_RIPEMD160_HMAC: for (k = 0; k < klen; k++) key[k] ^= HMAC_IPAD_VAL; axf->Init(sw->sw_ictx); axf->Update(sw->sw_ictx, key, klen); axf->Update(sw->sw_ictx, hmac_ipad_buffer, axf->blocksize - klen); for (k = 0; k < klen; k++) key[k] ^= (HMAC_IPAD_VAL ^ HMAC_OPAD_VAL); axf->Init(sw->sw_octx); axf->Update(sw->sw_octx, key, klen); axf->Update(sw->sw_octx, hmac_opad_buffer, axf->blocksize - klen); for (k = 0; k < klen; k++) key[k] ^= HMAC_OPAD_VAL; break; case CRYPTO_MD5_KPDK: case CRYPTO_SHA1_KPDK: { /* * We need a buffer that can hold an md5 and a sha1 result * just to throw it away. * What we do here is the initial part of: * ALGO( key, keyfill, .. ) * adding the key to sw_ictx and abusing Final() to get the * "keyfill" padding. * In addition we abuse the sw_octx to save the key to have * it to be able to append it at the end in swcr_authcompute(). */ u_char buf[SHA1_RESULTLEN]; sw->sw_klen = klen; bcopy(key, sw->sw_octx, klen); axf->Init(sw->sw_ictx); axf->Update(sw->sw_ictx, key, klen); axf->Final(buf, sw->sw_ictx); break; } default: printf("%s: CRD_F_KEY_EXPLICIT flag given, but algorithm %d " "doesn't use keys.\n", __func__, axf->type); } } /* * Compute keyed-hash authenticator. */ static int swcr_authcompute(struct cryptodesc *crd, struct swcr_data *sw, caddr_t buf, int flags) { unsigned char aalg[HASH_MAX_LEN]; struct auth_hash *axf; union authctx ctx; int err; if (sw->sw_ictx == 0) return EINVAL; axf = sw->sw_axf; if (crd->crd_flags & CRD_F_KEY_EXPLICIT) swcr_authprepare(axf, sw, crd->crd_key, crd->crd_klen); bcopy(sw->sw_ictx, &ctx, axf->ctxsize); err = crypto_apply(flags, buf, crd->crd_skip, crd->crd_len, (int (*)(void *, void *, unsigned int))axf->Update, (caddr_t)&ctx); if (err) return err; switch (sw->sw_alg) { case CRYPTO_MD5_HMAC: case CRYPTO_SHA1_HMAC: case CRYPTO_SHA2_256_HMAC: case CRYPTO_SHA2_384_HMAC: case CRYPTO_SHA2_512_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 we have no key saved, return error. */ if (sw->sw_octx == NULL) return EINVAL; /* * Add the trailing copy of the key (see comment in * swcr_authprepare()) after the data: * ALGO( .., key, algofill ) * and let Final() do the proper, natural "algofill" * padding. */ 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 */ crypto_copyback(flags, buf, crd->crd_inject, sw->sw_mlen == 0 ? axf->hashsize : sw->sw_mlen, aalg); return 0; } CTASSERT(INT_MAX <= (1ll<<39) - 256); /* GCM: plain text < 2^39-256 */ CTASSERT(INT_MAX <= (uint64_t)-1); /* GCM: associated data <= 2^64-1 */ /* * Apply a combined encryption-authentication transformation */ static int swcr_authenc(struct cryptop *crp) { uint32_t blkbuf[howmany(EALG_MAX_BLOCK_LEN, sizeof(uint32_t))]; u_char *blk = (u_char *)blkbuf; u_char aalg[AALG_MAX_RESULT_LEN]; u_char uaalg[AALG_MAX_RESULT_LEN]; u_char iv[EALG_MAX_BLOCK_LEN]; union authctx ctx; struct cryptodesc *crd, *crda = NULL, *crde = NULL; struct swcr_data *sw, *swa, *swe = NULL; struct auth_hash *axf = NULL; struct enc_xform *exf = NULL; caddr_t buf = (caddr_t)crp->crp_buf; uint32_t *blkp; int aadlen, blksz, i, ivlen, len, iskip, oskip, r; ivlen = blksz = iskip = oskip = 0; for (crd = crp->crp_desc; crd; crd = crd->crd_next) { for (sw = swcr_sessions[crp->crp_sid & 0xffffffff]; sw && sw->sw_alg != crd->crd_alg; sw = sw->sw_next) ; if (sw == NULL) return (EINVAL); switch (sw->sw_alg) { case CRYPTO_AES_NIST_GCM_16: case CRYPTO_AES_NIST_GMAC: swe = sw; crde = crd; exf = swe->sw_exf; ivlen = 12; break; case CRYPTO_AES_128_NIST_GMAC: case CRYPTO_AES_192_NIST_GMAC: case CRYPTO_AES_256_NIST_GMAC: swa = sw; crda = crd; axf = swa->sw_axf; if (swa->sw_ictx == 0) return (EINVAL); bcopy(swa->sw_ictx, &ctx, axf->ctxsize); blksz = axf->blocksize; break; default: return (EINVAL); } } if (crde == NULL || crda == NULL) return (EINVAL); if (crde->crd_alg == CRYPTO_AES_NIST_GCM_16 && (crde->crd_flags & CRD_F_IV_EXPLICIT) == 0) return (EINVAL); if (crde->crd_klen != crda->crd_klen) return (EINVAL); /* Initialize the IV */ if (crde->crd_flags & CRD_F_ENCRYPT) { /* IV explicitly provided ? */ if (crde->crd_flags & CRD_F_IV_EXPLICIT) bcopy(crde->crd_iv, iv, ivlen); else arc4rand(iv, ivlen, 0); /* Do we need to write the IV */ if (!(crde->crd_flags & CRD_F_IV_PRESENT)) crypto_copyback(crp->crp_flags, buf, crde->crd_inject, ivlen, iv); } else { /* Decryption */ /* IV explicitly provided ? */ if (crde->crd_flags & CRD_F_IV_EXPLICIT) bcopy(crde->crd_iv, iv, ivlen); else { /* Get IV off buf */ crypto_copydata(crp->crp_flags, buf, crde->crd_inject, ivlen, iv); } } /* Supply MAC with IV */ if (axf->Reinit) axf->Reinit(&ctx, iv, ivlen); /* Supply MAC with AAD */ aadlen = crda->crd_len; for (i = iskip; i < crda->crd_len; i += blksz) { len = MIN(crda->crd_len - i, blksz - oskip); crypto_copydata(crp->crp_flags, buf, crda->crd_skip + i, len, blk + oskip); bzero(blk + len + oskip, blksz - len - oskip); axf->Update(&ctx, blk, blksz); oskip = 0; /* reset initial output offset */ } if (exf->reinit) exf->reinit(swe->sw_kschedule, iv); /* Do encryption/decryption with MAC */ for (i = 0; i < crde->crd_len; i += blksz) { len = MIN(crde->crd_len - i, blksz); if (len < blksz) bzero(blk, blksz); crypto_copydata(crp->crp_flags, buf, crde->crd_skip + i, len, blk); if (crde->crd_flags & CRD_F_ENCRYPT) { exf->encrypt(swe->sw_kschedule, blk); axf->Update(&ctx, blk, len); crypto_copyback(crp->crp_flags, buf, crde->crd_skip + i, len, blk); } else { axf->Update(&ctx, blk, len); } } /* Do any required special finalization */ switch (crda->crd_alg) { case CRYPTO_AES_128_NIST_GMAC: case CRYPTO_AES_192_NIST_GMAC: case CRYPTO_AES_256_NIST_GMAC: /* length block */ bzero(blk, blksz); blkp = (uint32_t *)blk + 1; *blkp = htobe32(aadlen * 8); blkp = (uint32_t *)blk + 3; *blkp = htobe32(crde->crd_len * 8); axf->Update(&ctx, blk, blksz); break; } /* Finalize MAC */ axf->Final(aalg, &ctx); /* Validate tag */ if (!(crde->crd_flags & CRD_F_ENCRYPT)) { crypto_copydata(crp->crp_flags, buf, crda->crd_inject, axf->hashsize, uaalg); r = timingsafe_bcmp(aalg, uaalg, axf->hashsize); if (r == 0) { /* tag matches, decrypt data */ for (i = 0; i < crde->crd_len; i += blksz) { len = MIN(crde->crd_len - i, blksz); if (len < blksz) bzero(blk, blksz); crypto_copydata(crp->crp_flags, buf, crde->crd_skip + i, len, blk); if (!(crde->crd_flags & CRD_F_ENCRYPT)) { exf->decrypt(swe->sw_kschedule, blk); } crypto_copyback(crp->crp_flags, buf, crde->crd_skip + i, len, blk); } } else return (EBADMSG); } else { /* Inject the authentication data */ crypto_copyback(crp->crp_flags, buf, crda->crd_inject, axf->hashsize, aalg); } return (0); } /* * Apply a compression/decompression algorithm */ static int swcr_compdec(struct cryptodesc *crd, struct swcr_data *sw, caddr_t buf, int flags) { 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. */ data = malloc(crd->crd_len, M_CRYPTO_DATA, M_NOWAIT); if (data == NULL) return (EINVAL); crypto_copydata(flags, 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; } } crypto_copyback(flags, buf, crd->crd_skip, result, out); if (result < crd->crd_len) { adj = result - crd->crd_len; if (flags & CRYPTO_F_IMBUF) { adj = result - crd->crd_len; m_adj((struct mbuf *)buf, adj); } else if (flags & CRYPTO_F_IOV) { 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(device_t dev, 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 len; int error; if (sid == NULL || cri == NULL) return EINVAL; rw_wlock(&swcr_sessions_lock); 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; rw_wunlock(&swcr_sessions_lock); return ENOBUFS; } /* Copy existing sessions */ if (swcr_sessions != NULL) { bcopy(swcr_sessions, swd, (swcr_sesnum / 2) * sizeof(struct swcr_data *)); free(swcr_sessions, M_CRYPTO_DATA); } swcr_sessions = swd; } rw_downgrade(&swcr_sessions_lock); swd = &swcr_sessions[i]; *sid = i; while (cri) { *swd = malloc(sizeof(struct swcr_data), M_CRYPTO_DATA, M_NOWAIT|M_ZERO); if (*swd == NULL) { swcr_freesession_locked(dev, i); rw_runlock(&swcr_sessions_lock); 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_AES_XTS: txf = &enc_xform_aes_xts; goto enccommon; case CRYPTO_AES_ICM: txf = &enc_xform_aes_icm; goto enccommon; case CRYPTO_AES_NIST_GCM_16: txf = &enc_xform_aes_nist_gcm; goto enccommon; case CRYPTO_AES_NIST_GMAC: txf = &enc_xform_aes_nist_gmac; (*swd)->sw_exf = txf; break; case CRYPTO_CAMELLIA_CBC: txf = &enc_xform_camellia; goto enccommon; case CRYPTO_NULL_CBC: txf = &enc_xform_null; goto enccommon; enccommon: if (cri->cri_key != NULL) { error = txf->setkey(&((*swd)->sw_kschedule), cri->cri_key, cri->cri_klen / 8); if (error) { swcr_freesession_locked(dev, i); rw_runlock(&swcr_sessions_lock); return error; } } (*swd)->sw_exf = txf; break; case CRYPTO_MD5_HMAC: axf = &auth_hash_hmac_md5; goto authcommon; case CRYPTO_SHA1_HMAC: axf = &auth_hash_hmac_sha1; goto authcommon; case CRYPTO_SHA2_256_HMAC: axf = &auth_hash_hmac_sha2_256; goto authcommon; case CRYPTO_SHA2_384_HMAC: axf = &auth_hash_hmac_sha2_384; goto authcommon; case CRYPTO_SHA2_512_HMAC: axf = &auth_hash_hmac_sha2_512; goto authcommon; case CRYPTO_NULL_HMAC: axf = &auth_hash_null; goto authcommon; case CRYPTO_RIPEMD160_HMAC: axf = &auth_hash_hmac_ripemd_160; authcommon: (*swd)->sw_ictx = malloc(axf->ctxsize, M_CRYPTO_DATA, M_NOWAIT); if ((*swd)->sw_ictx == NULL) { swcr_freesession_locked(dev, i); rw_runlock(&swcr_sessions_lock); return ENOBUFS; } (*swd)->sw_octx = malloc(axf->ctxsize, M_CRYPTO_DATA, M_NOWAIT); if ((*swd)->sw_octx == NULL) { swcr_freesession_locked(dev, i); rw_runlock(&swcr_sessions_lock); return ENOBUFS; } if (cri->cri_key != NULL) { swcr_authprepare(axf, *swd, cri->cri_key, cri->cri_klen); } (*swd)->sw_mlen = cri->cri_mlen; (*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_locked(dev, i); rw_runlock(&swcr_sessions_lock); return ENOBUFS; } (*swd)->sw_octx = malloc(cri->cri_klen / 8, M_CRYPTO_DATA, M_NOWAIT); if ((*swd)->sw_octx == NULL) { swcr_freesession_locked(dev, i); rw_runlock(&swcr_sessions_lock); return ENOBUFS; } /* Store the key so we can "append" it to the payload */ if (cri->cri_key != NULL) { swcr_authprepare(axf, *swd, cri->cri_key, cri->cri_klen); } (*swd)->sw_mlen = cri->cri_mlen; (*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_locked(dev, i); rw_runlock(&swcr_sessions_lock); return ENOBUFS; } axf->Init((*swd)->sw_ictx); (*swd)->sw_mlen = cri->cri_mlen; (*swd)->sw_axf = axf; break; #endif case CRYPTO_AES_128_NIST_GMAC: axf = &auth_hash_nist_gmac_aes_128; goto auth4common; case CRYPTO_AES_192_NIST_GMAC: axf = &auth_hash_nist_gmac_aes_192; goto auth4common; case CRYPTO_AES_256_NIST_GMAC: axf = &auth_hash_nist_gmac_aes_256; auth4common: len = cri->cri_klen / 8; if (len != 16 && len != 24 && len != 32) return EINVAL; (*swd)->sw_ictx = malloc(axf->ctxsize, M_CRYPTO_DATA, M_NOWAIT); if ((*swd)->sw_ictx == NULL) { swcr_freesession_locked(dev, i); rw_runlock(&swcr_sessions_lock); return ENOBUFS; } axf->Init((*swd)->sw_ictx); axf->Setkey((*swd)->sw_ictx, cri->cri_key, len); (*swd)->sw_axf = axf; break; case CRYPTO_DEFLATE_COMP: cxf = &comp_algo_deflate; (*swd)->sw_cxf = cxf; break; default: swcr_freesession_locked(dev, i); rw_runlock(&swcr_sessions_lock); return EINVAL; } (*swd)->sw_alg = cri->cri_alg; cri = cri->cri_next; swd = &((*swd)->sw_next); } rw_runlock(&swcr_sessions_lock); return 0; } static int swcr_freesession(device_t dev, u_int64_t tid) { int error; rw_rlock(&swcr_sessions_lock); error = swcr_freesession_locked(dev, tid); rw_runlock(&swcr_sessions_lock); return error; } /* * Free a session. */ static int swcr_freesession_locked(device_t dev, u_int64_t tid) { struct swcr_data *swd; struct enc_xform *txf; struct auth_hash *axf; struct comp_algo *cxf; u_int32_t sid = CRYPTO_SESID2LID(tid); 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_AES_XTS: case CRYPTO_AES_ICM: case CRYPTO_AES_NIST_GCM_16: case CRYPTO_AES_NIST_GMAC: case CRYPTO_CAMELLIA_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_256_HMAC: case CRYPTO_SHA2_384_HMAC: case CRYPTO_SHA2_512_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(device_t dev, struct cryptop *crp, int hint) { struct cryptodesc *crd; struct swcr_data *sw; u_int32_t lid; /* Sanity check */ if (crp == NULL) return EINVAL; if (crp->crp_desc == NULL || crp->crp_buf == NULL) { crp->crp_etype = EINVAL; goto done; } lid = CRYPTO_SESID2LID(crp->crp_sid); rw_rlock(&swcr_sessions_lock); if (swcr_sessions == NULL || lid >= swcr_sesnum || lid == 0 || swcr_sessions[lid] == NULL) { rw_runlock(&swcr_sessions_lock); crp->crp_etype = ENOENT; goto done; } rw_runlock(&swcr_sessions_lock); /* 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). */ rw_rlock(&swcr_sessions_lock); if (swcr_sessions == NULL) { rw_runlock(&swcr_sessions_lock); crp->crp_etype = ENOENT; goto done; } for (sw = swcr_sessions[lid]; sw && sw->sw_alg != crd->crd_alg; sw = sw->sw_next) ; rw_runlock(&swcr_sessions_lock); /* 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: case CRYPTO_AES_XTS: case CRYPTO_AES_ICM: case CRYPTO_CAMELLIA_CBC: if ((crp->crp_etype = swcr_encdec(crd, sw, crp->crp_buf, crp->crp_flags)) != 0) goto done; break; case CRYPTO_NULL_CBC: crp->crp_etype = 0; break; case CRYPTO_MD5_HMAC: case CRYPTO_SHA1_HMAC: case CRYPTO_SHA2_256_HMAC: case CRYPTO_SHA2_384_HMAC: case CRYPTO_SHA2_512_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(crd, sw, crp->crp_buf, crp->crp_flags)) != 0) goto done; break; case CRYPTO_AES_NIST_GCM_16: case CRYPTO_AES_NIST_GMAC: case CRYPTO_AES_128_NIST_GMAC: case CRYPTO_AES_192_NIST_GMAC: case CRYPTO_AES_256_NIST_GMAC: crp->crp_etype = swcr_authenc(crp); goto done; case CRYPTO_DEFLATE_COMP: if ((crp->crp_etype = swcr_compdec(crd, sw, crp->crp_buf, crp->crp_flags)) != 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; } static void swcr_identify(driver_t *drv, device_t parent) { /* NB: order 10 is so we get attached after h/w devices */ if (device_find_child(parent, "cryptosoft", -1) == NULL && BUS_ADD_CHILD(parent, 10, "cryptosoft", 0) == 0) panic("cryptosoft: could not attach"); } static int swcr_probe(device_t dev) { device_set_desc(dev, "software crypto"); return (BUS_PROBE_NOWILDCARD); } static int swcr_attach(device_t dev) { rw_init(&swcr_sessions_lock, "swcr_sessions_lock"); memset(hmac_ipad_buffer, HMAC_IPAD_VAL, HMAC_MAX_BLOCK_LEN); memset(hmac_opad_buffer, HMAC_OPAD_VAL, HMAC_MAX_BLOCK_LEN); swcr_id = crypto_get_driverid(dev, CRYPTOCAP_F_SOFTWARE | CRYPTOCAP_F_SYNC); if (swcr_id < 0) { device_printf(dev, "cannot initialize!"); return ENOMEM; } #define REGISTER(alg) \ crypto_register(swcr_id, alg, 0,0) REGISTER(CRYPTO_DES_CBC); 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_256_HMAC); REGISTER(CRYPTO_SHA2_384_HMAC); REGISTER(CRYPTO_SHA2_512_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_AES_XTS); REGISTER(CRYPTO_AES_ICM); REGISTER(CRYPTO_AES_NIST_GCM_16); REGISTER(CRYPTO_AES_NIST_GMAC); REGISTER(CRYPTO_AES_128_NIST_GMAC); REGISTER(CRYPTO_AES_192_NIST_GMAC); REGISTER(CRYPTO_AES_256_NIST_GMAC); REGISTER(CRYPTO_CAMELLIA_CBC); REGISTER(CRYPTO_DEFLATE_COMP); #undef REGISTER return 0; } static int swcr_detach(device_t dev) { crypto_unregister_all(swcr_id); rw_wlock(&swcr_sessions_lock); free(swcr_sessions, M_CRYPTO_DATA); swcr_sessions = NULL; rw_wunlock(&swcr_sessions_lock); rw_destroy(&swcr_sessions_lock); return 0; } static device_method_t swcr_methods[] = { DEVMETHOD(device_identify, swcr_identify), DEVMETHOD(device_probe, swcr_probe), DEVMETHOD(device_attach, swcr_attach), DEVMETHOD(device_detach, swcr_detach), DEVMETHOD(cryptodev_newsession, swcr_newsession), DEVMETHOD(cryptodev_freesession,swcr_freesession), DEVMETHOD(cryptodev_process, swcr_process), {0, 0}, }; static driver_t swcr_driver = { "cryptosoft", swcr_methods, 0, /* NB: no softc */ }; static devclass_t swcr_devclass; /* * NB: We explicitly reference the crypto module so we * get the necessary ordering when built as a loadable * module. This is required because we bundle the crypto * module code together with the cryptosoft driver (otherwise * normal module dependencies would handle things). */ extern int crypto_modevent(struct module *, int, void *); /* XXX where to attach */ DRIVER_MODULE(cryptosoft, nexus, swcr_driver, swcr_devclass, crypto_modevent,0); MODULE_VERSION(cryptosoft, 1); MODULE_DEPEND(cryptosoft, crypto, 1, 1, 1);