| /* |
| * Copyright (C) 2006 Micronas USA |
| * |
| * 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. The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 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 AUTHOR 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. |
| * |
| * Effort sponsored in part by the Defense Advanced Research Projects |
| * Agency (DARPA) and Air Force Research Laboratory, Air Force |
| * Materiel Command, USAF, under agreement number F30602-01-2-0537. |
| * |
| */ |
| |
| //#include <linux/config.h> |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/list.h> |
| #include <linux/slab.h> |
| #include <linux/sched.h> |
| #include <linux/wait.h> |
| #include <linux/crypto.h> |
| #include <linux/mm.h> |
| #include <linux/skbuff.h> |
| #include <linux/random.h> |
| #include <asm/io.h> |
| #include <asm/delay.h> |
| //#include <asm/scatterlist.h> |
| #include <linux/scatterlist.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/highmem.h> |
| #include <cryptodev.h> |
| #include <uio.h> |
| #include <aes-7108.h> |
| |
| /* Runtime mode */ |
| static int c7108_crypto_mode = C7108_AES_CTRL_MODE_CTR; |
| //static int c7108_crypto_mode = C7108_AES_CTRL_MODE_CBC; |
| |
| static int32_t c7108_id = -1; |
| static struct cipher_7108 **c7108_sessions = NULL; |
| static u_int32_t c7108_sesnum = 0; |
| static unsigned long iobar; |
| |
| /* Crypto entry points */ |
| static int c7108_process(void *, struct cryptop *, int); |
| static int c7108_newsession(void *, u_int32_t *, struct cryptoini *); |
| static int c7108_freesession(void *, u_int64_t); |
| |
| /* Globals */ |
| static int debug = 0; |
| static spinlock_t csr_mutex; |
| |
| /* Generic controller-based lock */ |
| #define AES_LOCK()\ |
| spin_lock(&csr_mutex) |
| #define AES_UNLOCK()\ |
| spin_unlock(&csr_mutex) |
| |
| /* 7108 AES register access */ |
| #define c7108_reg_wr8(a,d) iowrite8(d, (void*)(iobar+(a))) |
| #define c7108_reg_wr16(a,d) iowrite16(d, (void*)(iobar+(a))) |
| #define c7108_reg_wr32(a,d) iowrite32(d, (void*)(iobar+(a))) |
| #define c7108_reg_rd8(a) ioread8((void*)(iobar+(a))) |
| #define c7108_reg_rd16(a) ioread16((void*)(iobar+(a))) |
| #define c7108_reg_rd32(a) ioread32((void*)(iobar+(a))) |
| |
| static int |
| c7108_xlate_key(int klen, u8* k8ptr, u32* k32ptr) |
| { |
| int i, nw=0; |
| nw = ((klen >= 256) ? 8 : (klen >= 192) ? 6 : 4); |
| for ( i = 0; i < nw; i++) { |
| k32ptr[i] = (k8ptr[i+3] << 24) | (k8ptr[i+2] << 16) | |
| (k8ptr[i+1] << 8) | k8ptr[i]; |
| |
| } |
| return 0; |
| } |
| |
| static int |
| c7108_cache_key(int klen, u32* k32ptr, u8* k8ptr) |
| { |
| int i, nb=0; |
| u8* ptr = (u8*)k32ptr; |
| nb = ((klen >= 256) ? 32 : (klen >= 192) ? 24 : 16); |
| for ( i = 0; i < nb; i++) |
| k8ptr[i] = ptr[i]; |
| return 0; |
| } |
| |
| static int |
| c7108_aes_setup_dma(u32 src, u32 dst, u32 len) |
| { |
| if (len < 16) { |
| printk("len < 16\n"); |
| return -10; |
| } |
| if (len % 16) { |
| printk("len not multiple of 16\n"); |
| return -11; |
| } |
| c7108_reg_wr16(C7108_AES_DMA_SRC0_LO, (u16) src); |
| c7108_reg_wr16(C7108_AES_DMA_SRC0_HI, (u16)((src & 0xffff0000) >> 16)); |
| c7108_reg_wr16(C7108_AES_DMA_DST0_LO, (u16) dst); |
| c7108_reg_wr16(C7108_AES_DMA_DST0_HI, (u16)((dst & 0xffff0000) >> 16)); |
| c7108_reg_wr16(C7108_AES_DMA_LEN, (u16) ((len / 16) - 1)); |
| |
| return 0; |
| } |
| |
| static int |
| c7108_aes_set_hw_iv(u8 iv[16]) |
| { |
| c7108_reg_wr16(C7108_AES_IV0_LO, (u16) ((iv[1] << 8) | iv[0])); |
| c7108_reg_wr16(C7108_AES_IV0_HI, (u16) ((iv[3] << 8) | iv[2])); |
| c7108_reg_wr16(C7108_AES_IV1_LO, (u16) ((iv[5] << 8) | iv[4])); |
| c7108_reg_wr16(C7108_AES_IV1_HI, (u16) ((iv[7] << 8) | iv[6])); |
| c7108_reg_wr16(C7108_AES_IV2_LO, (u16) ((iv[9] << 8) | iv[8])); |
| c7108_reg_wr16(C7108_AES_IV2_HI, (u16) ((iv[11] << 8) | iv[10])); |
| c7108_reg_wr16(C7108_AES_IV3_LO, (u16) ((iv[13] << 8) | iv[12])); |
| c7108_reg_wr16(C7108_AES_IV3_HI, (u16) ((iv[15] << 8) | iv[14])); |
| |
| return 0; |
| } |
| |
| static void |
| c7108_aes_read_dkey(u32 * dkey) |
| { |
| dkey[0] = (c7108_reg_rd16(C7108_AES_EKEY0_HI) << 16) | |
| c7108_reg_rd16(C7108_AES_EKEY0_LO); |
| dkey[1] = (c7108_reg_rd16(C7108_AES_EKEY1_HI) << 16) | |
| c7108_reg_rd16(C7108_AES_EKEY1_LO); |
| dkey[2] = (c7108_reg_rd16(C7108_AES_EKEY2_HI) << 16) | |
| c7108_reg_rd16(C7108_AES_EKEY2_LO); |
| dkey[3] = (c7108_reg_rd16(C7108_AES_EKEY3_HI) << 16) | |
| c7108_reg_rd16(C7108_AES_EKEY3_LO); |
| dkey[4] = (c7108_reg_rd16(C7108_AES_EKEY4_HI) << 16) | |
| c7108_reg_rd16(C7108_AES_EKEY4_LO); |
| dkey[5] = (c7108_reg_rd16(C7108_AES_EKEY5_HI) << 16) | |
| c7108_reg_rd16(C7108_AES_EKEY5_LO); |
| dkey[6] = (c7108_reg_rd16(C7108_AES_EKEY6_HI) << 16) | |
| c7108_reg_rd16(C7108_AES_EKEY6_LO); |
| dkey[7] = (c7108_reg_rd16(C7108_AES_EKEY7_HI) << 16) | |
| c7108_reg_rd16(C7108_AES_EKEY7_LO); |
| } |
| |
| static int |
| c7108_aes_cipher(int op, |
| u32 dst, |
| u32 src, |
| u32 len, |
| int klen, |
| u16 mode, |
| u32 key[8], |
| u8 iv[16]) |
| { |
| int rv = 0, cnt=0; |
| u16 ctrl = 0, stat = 0; |
| |
| AES_LOCK(); |
| |
| /* Setup key length */ |
| if (klen == 128) { |
| ctrl |= C7108_AES_KEY_LEN_128; |
| } else if (klen == 192) { |
| ctrl |= C7108_AES_KEY_LEN_192; |
| } else if (klen == 256) { |
| ctrl |= C7108_AES_KEY_LEN_256; |
| } else { |
| AES_UNLOCK(); |
| return -3; |
| } |
| |
| /* Check opcode */ |
| if (C7108_AES_ENCRYPT == op) { |
| ctrl |= C7108_AES_ENCRYPT; |
| } else if (C7108_AES_DECRYPT == op) { |
| ctrl |= C7108_AES_DECRYPT; |
| } else { |
| AES_UNLOCK(); |
| return -4; |
| } |
| |
| /* check mode */ |
| if ( (mode != C7108_AES_CTRL_MODE_CBC) && |
| (mode != C7108_AES_CTRL_MODE_CFB) && |
| (mode != C7108_AES_CTRL_MODE_OFB) && |
| (mode != C7108_AES_CTRL_MODE_CTR) && |
| (mode != C7108_AES_CTRL_MODE_ECB) ) { |
| AES_UNLOCK(); |
| return -5; |
| } |
| |
| /* Now set mode */ |
| ctrl |= mode; |
| |
| /* For CFB, OFB, and CTR, neither backward key |
| * expansion nor key inversion is required. |
| */ |
| if ( (C7108_AES_DECRYPT == op) && |
| (C7108_AES_CTRL_MODE_CBC == mode || |
| C7108_AES_CTRL_MODE_ECB == mode ) ){ |
| |
| /* Program Key */ |
| c7108_reg_wr16(C7108_AES_KEY0_LO, (u16) key[4]); |
| c7108_reg_wr16(C7108_AES_KEY0_HI, (u16) (key[4] >> 16)); |
| c7108_reg_wr16(C7108_AES_KEY1_LO, (u16) key[5]); |
| c7108_reg_wr16(C7108_AES_KEY1_HI, (u16) (key[5] >> 16)); |
| c7108_reg_wr16(C7108_AES_KEY2_LO, (u16) key[6]); |
| c7108_reg_wr16(C7108_AES_KEY2_HI, (u16) (key[6] >> 16)); |
| c7108_reg_wr16(C7108_AES_KEY3_LO, (u16) key[7]); |
| c7108_reg_wr16(C7108_AES_KEY3_HI, (u16) (key[7] >> 16)); |
| c7108_reg_wr16(C7108_AES_KEY6_LO, (u16) key[2]); |
| c7108_reg_wr16(C7108_AES_KEY6_HI, (u16) (key[2] >> 16)); |
| c7108_reg_wr16(C7108_AES_KEY7_LO, (u16) key[3]); |
| c7108_reg_wr16(C7108_AES_KEY7_HI, (u16) (key[3] >> 16)); |
| |
| |
| if (192 == klen) { |
| c7108_reg_wr16(C7108_AES_KEY4_LO, (u16) key[7]); |
| c7108_reg_wr16(C7108_AES_KEY4_HI, (u16) (key[7] >> 16)); |
| c7108_reg_wr16(C7108_AES_KEY5_LO, (u16) key[7]); |
| c7108_reg_wr16(C7108_AES_KEY5_HI, (u16) (key[7] >> 16)); |
| |
| } else if (256 == klen) { |
| /* 256 */ |
| c7108_reg_wr16(C7108_AES_KEY4_LO, (u16) key[0]); |
| c7108_reg_wr16(C7108_AES_KEY4_HI, (u16) (key[0] >> 16)); |
| c7108_reg_wr16(C7108_AES_KEY5_LO, (u16) key[1]); |
| c7108_reg_wr16(C7108_AES_KEY5_HI, (u16) (key[1] >> 16)); |
| |
| } |
| |
| } else { |
| /* Program Key */ |
| c7108_reg_wr16(C7108_AES_KEY0_LO, (u16) key[0]); |
| c7108_reg_wr16(C7108_AES_KEY0_HI, (u16) (key[0] >> 16)); |
| c7108_reg_wr16(C7108_AES_KEY1_LO, (u16) key[1]); |
| c7108_reg_wr16(C7108_AES_KEY1_HI, (u16) (key[1] >> 16)); |
| c7108_reg_wr16(C7108_AES_KEY2_LO, (u16) key[2]); |
| c7108_reg_wr16(C7108_AES_KEY2_HI, (u16) (key[2] >> 16)); |
| c7108_reg_wr16(C7108_AES_KEY3_LO, (u16) key[3]); |
| c7108_reg_wr16(C7108_AES_KEY3_HI, (u16) (key[3] >> 16)); |
| c7108_reg_wr16(C7108_AES_KEY4_LO, (u16) key[4]); |
| c7108_reg_wr16(C7108_AES_KEY4_HI, (u16) (key[4] >> 16)); |
| c7108_reg_wr16(C7108_AES_KEY5_LO, (u16) key[5]); |
| c7108_reg_wr16(C7108_AES_KEY5_HI, (u16) (key[5] >> 16)); |
| c7108_reg_wr16(C7108_AES_KEY6_LO, (u16) key[6]); |
| c7108_reg_wr16(C7108_AES_KEY6_HI, (u16) (key[6] >> 16)); |
| c7108_reg_wr16(C7108_AES_KEY7_LO, (u16) key[7]); |
| c7108_reg_wr16(C7108_AES_KEY7_HI, (u16) (key[7] >> 16)); |
| |
| } |
| |
| /* Set IV always */ |
| c7108_aes_set_hw_iv(iv); |
| |
| /* Program DMA addresses */ |
| if ((rv = c7108_aes_setup_dma(src, dst, len)) < 0) { |
| AES_UNLOCK(); |
| return rv; |
| } |
| |
| |
| /* Start AES cipher */ |
| c7108_reg_wr16(C7108_AES_CTRL, ctrl | C7108_AES_GO); |
| |
| //printk("Ctrl: 0x%x\n", ctrl | C7108_AES_GO); |
| do { |
| /* TODO: interrupt mode */ |
| // printk("aes_stat=0x%x\n", stat); |
| //udelay(100); |
| } while ((cnt++ < 1000000) && |
| !((stat=c7108_reg_rd16(C7108_AES_CTRL))&C7108_AES_OP_DONE)); |
| |
| |
| if ((mode == C7108_AES_CTRL_MODE_ECB)|| |
| (mode == C7108_AES_CTRL_MODE_CBC)) { |
| /* Save out key when the lock is held ... */ |
| c7108_aes_read_dkey(key); |
| } |
| |
| AES_UNLOCK(); |
| return 0; |
| |
| } |
| |
| /* |
| * Generate a new crypto device session. |
| */ |
| static int |
| c7108_newsession(void *arg, u_int32_t *sid, struct cryptoini *cri) |
| { |
| struct cipher_7108 **swd; |
| u_int32_t i; |
| char *algo; |
| int mode, xfm_type; |
| |
| dprintk("%s()\n", __FUNCTION__); |
| if (sid == NULL || cri == NULL) { |
| dprintk("%s,%d - EINVAL\n", __FILE__, __LINE__); |
| return EINVAL; |
| } |
| |
| if (c7108_sessions) { |
| for (i = 1; i < c7108_sesnum; i++) |
| if (c7108_sessions[i] == NULL) |
| break; |
| } else |
| i = 1; /* NB: to silence compiler warning */ |
| |
| if (c7108_sessions == NULL || i == c7108_sesnum) { |
| if (c7108_sessions == NULL) { |
| i = 1; /* We leave c7108_sessions[0] empty */ |
| c7108_sesnum = CRYPTO_SW_SESSIONS; |
| } else |
| c7108_sesnum *= 2; |
| |
| swd = kmalloc(c7108_sesnum * sizeof(struct cipher_7108 *), |
| GFP_ATOMIC); |
| if (swd == NULL) { |
| /* Reset session number */ |
| if (c7108_sesnum == CRYPTO_SW_SESSIONS) |
| c7108_sesnum = 0; |
| else |
| c7108_sesnum /= 2; |
| dprintk("%s,%d: ENOBUFS\n", __FILE__, __LINE__); |
| return ENOBUFS; |
| } |
| memset(swd, 0, c7108_sesnum * sizeof(struct cipher_7108 *)); |
| |
| /* Copy existing sessions */ |
| if (c7108_sessions) { |
| memcpy(swd, c7108_sessions, |
| (c7108_sesnum / 2) * sizeof(struct cipher_7108 *)); |
| kfree(c7108_sessions); |
| } |
| |
| c7108_sessions = swd; |
| |
| } |
| |
| swd = &c7108_sessions[i]; |
| *sid = i; |
| |
| while (cri) { |
| *swd = (struct cipher_7108 *) |
| kmalloc(sizeof(struct cipher_7108), GFP_ATOMIC); |
| if (*swd == NULL) { |
| c7108_freesession(NULL, i); |
| dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__); |
| return ENOBUFS; |
| } |
| memset(*swd, 0, sizeof(struct cipher_7108)); |
| |
| algo = NULL; |
| mode = 0; |
| xfm_type = HW_TYPE_CIPHER; |
| |
| switch (cri->cri_alg) { |
| |
| case CRYPTO_AES_CBC: |
| algo = "aes"; |
| mode = CRYPTO_TFM_MODE_CBC; |
| c7108_crypto_mode = C7108_AES_CTRL_MODE_CBC; |
| break; |
| #if 0 |
| case CRYPTO_AES_CTR: |
| algo = "aes_ctr"; |
| mode = CRYPTO_TFM_MODE_CBC; |
| c7108_crypto_mode = C7108_AES_CTRL_MODE_CTR; |
| break; |
| case CRYPTO_AES_ECB: |
| algo = "aes_ecb"; |
| mode = CRYPTO_TFM_MODE_CBC; |
| c7108_crypto_mode = C7108_AES_CTRL_MODE_ECB; |
| break; |
| case CRYPTO_AES_OFB: |
| algo = "aes_ofb"; |
| mode = CRYPTO_TFM_MODE_CBC; |
| c7108_crypto_mode = C7108_AES_CTRL_MODE_OFB; |
| break; |
| case CRYPTO_AES_CFB: |
| algo = "aes_cfb"; |
| mode = CRYPTO_TFM_MODE_CBC; |
| c7108_crypto_mode = C7108_AES_CTRL_MODE_CFB; |
| break; |
| #endif |
| default: |
| printk("unsupported crypto algorithm: %d\n", |
| cri->cri_alg); |
| return -EINVAL; |
| break; |
| } |
| |
| |
| if (!algo || !*algo) { |
| printk("cypher_7108_crypto: Unknown algo 0x%x\n", |
| cri->cri_alg); |
| c7108_freesession(NULL, i); |
| return EINVAL; |
| } |
| |
| if (xfm_type == HW_TYPE_CIPHER) { |
| if (debug) { |
| dprintk("%s key:", __FUNCTION__); |
| for (i = 0; i < (cri->cri_klen + 7) / 8; i++) |
| dprintk("%s0x%02x", (i % 8) ? " " : "\n ", |
| cri->cri_key[i]); |
| dprintk("\n"); |
| } |
| |
| } else if (xfm_type == SW_TYPE_HMAC || |
| xfm_type == SW_TYPE_HASH) { |
| printk("cypher_7108_crypto: HMAC unsupported!\n"); |
| return -EINVAL; |
| c7108_freesession(NULL, i); |
| } else { |
| printk("cypher_7108_crypto: " |
| "Unhandled xfm_type %d\n", xfm_type); |
| c7108_freesession(NULL, i); |
| return EINVAL; |
| } |
| |
| (*swd)->cri_alg = cri->cri_alg; |
| (*swd)->xfm_type = xfm_type; |
| |
| cri = cri->cri_next; |
| swd = &((*swd)->next); |
| } |
| return 0; |
| } |
| |
| /* |
| * Free a session. |
| */ |
| static int |
| c7108_freesession(void *arg, u_int64_t tid) |
| { |
| struct cipher_7108 *swd; |
| u_int32_t sid = CRYPTO_SESID2LID(tid); |
| |
| dprintk("%s()\n", __FUNCTION__); |
| if (sid > c7108_sesnum || c7108_sessions == NULL || |
| c7108_sessions[sid] == NULL) { |
| dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__); |
| return(EINVAL); |
| } |
| |
| /* Silently accept and return */ |
| if (sid == 0) |
| return(0); |
| |
| while ((swd = c7108_sessions[sid]) != NULL) { |
| c7108_sessions[sid] = swd->next; |
| kfree(swd); |
| } |
| return 0; |
| } |
| |
| /* |
| * Process a hardware request. |
| */ |
| static int |
| c7108_process(void *arg, struct cryptop *crp, int hint) |
| { |
| struct cryptodesc *crd; |
| struct cipher_7108 *sw; |
| u_int32_t lid; |
| int type; |
| u32 hwkey[8]; |
| |
| #define SCATTERLIST_MAX 16 |
| struct scatterlist sg[SCATTERLIST_MAX]; |
| int sg_num, sg_len, skip; |
| struct sk_buff *skb = NULL; |
| struct uio *uiop = NULL; |
| |
| dprintk("%s()\n", __FUNCTION__); |
| /* Sanity check */ |
| if (crp == NULL) { |
| dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__); |
| return EINVAL; |
| } |
| |
| crp->crp_etype = 0; |
| |
| if (crp->crp_desc == NULL || crp->crp_buf == NULL) { |
| dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__); |
| crp->crp_etype = EINVAL; |
| goto done; |
| } |
| |
| lid = crp->crp_sid & 0xffffffff; |
| if (lid >= c7108_sesnum || lid == 0 || c7108_sessions == NULL || |
| c7108_sessions[lid] == NULL) { |
| crp->crp_etype = ENOENT; |
| dprintk("%s,%d: ENOENT\n", __FILE__, __LINE__); |
| goto done; |
| } |
| |
| /* |
| * do some error checking outside of the loop for SKB and IOV |
| * processing this leaves us with valid skb or uiop pointers |
| * for later |
| */ |
| if (crp->crp_flags & CRYPTO_F_SKBUF) { |
| skb = (struct sk_buff *) crp->crp_buf; |
| if (skb_shinfo(skb)->nr_frags >= SCATTERLIST_MAX) { |
| printk("%s,%d: %d nr_frags > SCATTERLIST_MAX", |
| __FILE__, __LINE__, |
| skb_shinfo(skb)->nr_frags); |
| goto done; |
| } |
| } else if (crp->crp_flags & CRYPTO_F_IOV) { |
| uiop = (struct uio *) crp->crp_buf; |
| if (uiop->uio_iovcnt > SCATTERLIST_MAX) { |
| printk("%s,%d: %d uio_iovcnt > SCATTERLIST_MAX", |
| __FILE__, __LINE__, |
| uiop->uio_iovcnt); |
| goto done; |
| } |
| } |
| |
| /* 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 = c7108_sessions[lid]; |
| sw && sw->cri_alg != crd->crd_alg; |
| sw = sw->next) |
| ; |
| |
| /* No such context ? */ |
| if (sw == NULL) { |
| crp->crp_etype = EINVAL; |
| dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__); |
| goto done; |
| } |
| |
| skip = crd->crd_skip; |
| |
| /* |
| * setup the SG list skip from the start of the buffer |
| */ |
| memset(sg, 0, sizeof(sg)); |
| if (crp->crp_flags & CRYPTO_F_SKBUF) { |
| int i, len; |
| type = CRYPTO_BUF_SKBUF; |
| |
| sg_num = 0; |
| sg_len = 0; |
| |
| if (skip < skb_headlen(skb)) { |
| //sg[sg_num].page = virt_to_page(skb->data + skip); |
| //sg[sg_num].offset = offset_in_page(skb->data + skip); |
| len = skb_headlen(skb) - skip; |
| if (len + sg_len > crd->crd_len) |
| len = crd->crd_len - sg_len; |
| //sg[sg_num].length = len; |
| sg_set_page(&sg[sg_num], virt_to_page(skb->data + skip), len, offset_in_page(skb->data + skip)); |
| sg_len += sg[sg_num].length; |
| sg_num++; |
| skip = 0; |
| } else |
| skip -= skb_headlen(skb); |
| |
| for (i = 0; sg_len < crd->crd_len && |
| i < skb_shinfo(skb)->nr_frags && |
| sg_num < SCATTERLIST_MAX; i++) { |
| if (skip < skb_shinfo(skb)->frags[i].size) { |
| //sg[sg_num].page = skb_frag_page(&skb_shinfo(skb)->frags[i]); |
| //sg[sg_num].offset = skb_shinfo(skb)->frags[i].page_offset + skip; |
| len = skb_shinfo(skb)->frags[i].size - skip; |
| if (len + sg_len > crd->crd_len) |
| len = crd->crd_len - sg_len; |
| //sg[sg_num].length = len; |
| sg_set_page(&sg[sg_num], skb_frag_page(&skb_shinfo(skb)->frags[i]), len, skb_shinfo(skb)->frags[i].page_offset + skip); |
| sg_len += sg[sg_num].length; |
| sg_num++; |
| skip = 0; |
| } else |
| skip -= skb_shinfo(skb)->frags[i].size; |
| } |
| } else if (crp->crp_flags & CRYPTO_F_IOV) { |
| int len; |
| type = CRYPTO_BUF_IOV; |
| sg_len = 0; |
| for (sg_num = 0; sg_len < crd->crd_len && |
| sg_num < uiop->uio_iovcnt && |
| sg_num < SCATTERLIST_MAX; sg_num++) { |
| if (skip < uiop->uio_iov[sg_num].iov_len) { |
| //sg[sg_num].page = virt_to_page(uiop->uio_iov[sg_num].iov_base+skip); |
| //sg[sg_num].offset = offset_in_page(uiop->uio_iov[sg_num].iov_base+skip); |
| len = uiop->uio_iov[sg_num].iov_len - skip; |
| if (len + sg_len > crd->crd_len) |
| len = crd->crd_len - sg_len; |
| //sg[sg_num].length = len; |
| sg_set_page(&sg[sg_num], virt_to_page(uiop->uio_iov[sg_num].iov_base+skip), len, offset_in_page(uiop->uio_iov[sg_num].iov_base+skip)); |
| sg_len += sg[sg_num].length; |
| skip = 0; |
| } else |
| skip -= uiop->uio_iov[sg_num].iov_len; |
| } |
| } else { |
| type = CRYPTO_BUF_CONTIG; |
| //sg[0].page = virt_to_page(crp->crp_buf + skip); |
| //sg[0].offset = offset_in_page(crp->crp_buf + skip); |
| sg_len = (crp->crp_ilen - skip); |
| if (sg_len > crd->crd_len) |
| sg_len = crd->crd_len; |
| //sg[0].length = sg_len; |
| sg_set_page(&sg[0], virt_to_page(crp->crp_buf + skip), sg_len, offset_in_page(crp->crp_buf + skip)); |
| sg_num = 1; |
| } |
| if (sg_num > 0) |
| sg_mark_end(&sg[sg_num-1]); |
| |
| |
| switch (sw->xfm_type) { |
| |
| case HW_TYPE_CIPHER: { |
| |
| unsigned char iv[64]; |
| unsigned char *ivp = iv; |
| int i; |
| int ivsize = 16; /* fixed for AES */ |
| int blocksize = 16; /* fixed for AES */ |
| |
| if (sg_len < blocksize) { |
| crp->crp_etype = EINVAL; |
| dprintk("%s,%d: EINVAL len %d < %d\n", |
| __FILE__, __LINE__, |
| sg_len, |
| blocksize); |
| goto done; |
| } |
| |
| if (ivsize > sizeof(iv)) { |
| crp->crp_etype = EINVAL; |
| dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__); |
| goto done; |
| } |
| |
| if (crd->crd_flags & CRD_F_ENCRYPT) { /* encrypt */ |
| |
| if (crd->crd_flags & CRD_F_IV_EXPLICIT) { |
| ivp = crd->crd_iv; |
| } else { |
| get_random_bytes(ivp, ivsize); |
| } |
| /* |
| * do we have to copy the IV back to the buffer ? |
| */ |
| if ((crd->crd_flags & CRD_F_IV_PRESENT) == 0) { |
| crypto_copyback(crp->crp_buf, |
| crd->crd_inject, |
| ivsize, |
| (caddr_t)ivp); |
| } |
| |
| c7108_xlate_key(crd->crd_klen, |
| (u8*)crd->crd_key, (u32*)hwkey); |
| |
| /* Encrypt SG list */ |
| for (i = 0; i < sg_num; i++) { |
| sg[i].dma_address = |
| dma_map_single(NULL, |
| kmap(sg_page(&sg[i])) + sg[i].offset, sg_len, DMA_BIDIRECTIONAL); |
| #if 0 |
| printk("sg[%d]:0x%08x, off 0x%08x " |
| "kmap 0x%08x phys 0x%08x\n", |
| i, sg[i].page, sg[i].offset, |
| kmap(sg[i].page) + sg[i].offset, |
| sg[i].dma_address); |
| #endif |
| c7108_aes_cipher(C7108_AES_ENCRYPT, |
| sg[i].dma_address, |
| sg[i].dma_address, |
| sg_len, |
| crd->crd_klen, |
| c7108_crypto_mode, |
| hwkey, |
| ivp); |
| |
| if ((c7108_crypto_mode == C7108_AES_CTRL_MODE_CBC)|| |
| (c7108_crypto_mode == C7108_AES_CTRL_MODE_ECB)) { |
| /* Read back expanded key and cache it in key |
| * context. |
| * NOTE: for ECB/CBC modes only (not CTR, CFB, OFB) |
| * where you set the key once. |
| */ |
| c7108_cache_key(crd->crd_klen, |
| (u32*)hwkey, (u8*)crd->crd_key); |
| #if 0 |
| printk("%s expanded key:", __FUNCTION__); |
| for (i = 0; i < (crd->crd_klen + 7) / 8; i++) |
| printk("%s0x%02x", (i % 8) ? " " : "\n ", |
| crd->crd_key[i]); |
| printk("\n"); |
| #endif |
| } |
| } |
| } |
| else { /*decrypt */ |
| |
| if (crd->crd_flags & CRD_F_IV_EXPLICIT) { |
| ivp = crd->crd_iv; |
| } else { |
| crypto_copydata(crp->crp_buf, crd->crd_inject, |
| ivsize, (caddr_t)ivp); |
| } |
| |
| c7108_xlate_key(crd->crd_klen, |
| (u8*)crd->crd_key, (u32*)hwkey); |
| |
| /* Decrypt SG list */ |
| for (i = 0; i < sg_num; i++) { |
| sg[i].dma_address = |
| dma_map_single(NULL, |
| kmap(sg_page(&sg[i])) + sg[i].offset, |
| sg_len, DMA_BIDIRECTIONAL); |
| |
| #if 0 |
| printk("sg[%d]:0x%08x, off 0x%08x " |
| "kmap 0x%08x phys 0x%08x\n", |
| i, sg[i].page, sg[i].offset, |
| kmap(sg[i].page) + sg[i].offset, |
| sg[i].dma_address); |
| #endif |
| c7108_aes_cipher(C7108_AES_DECRYPT, |
| sg[i].dma_address, |
| sg[i].dma_address, |
| sg_len, |
| crd->crd_klen, |
| c7108_crypto_mode, |
| hwkey, |
| ivp); |
| } |
| } |
| } break; |
| case SW_TYPE_HMAC: |
| case SW_TYPE_HASH: |
| crp->crp_etype = EINVAL; |
| goto done; |
| break; |
| |
| case SW_TYPE_COMP: |
| crp->crp_etype = EINVAL; |
| goto done; |
| break; |
| |
| default: |
| /* Unknown/unsupported algorithm */ |
| dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__); |
| crp->crp_etype = EINVAL; |
| goto done; |
| } |
| } |
| |
| done: |
| crypto_done(crp); |
| return 0; |
| } |
| |
| static struct { |
| softc_device_decl sc_dev; |
| } a7108dev; |
| |
| static device_method_t a7108_methods = { |
| /* crypto device methods */ |
| DEVMETHOD(cryptodev_newsession, c7108_newsession), |
| DEVMETHOD(cryptodev_freesession, c7108_freesession), |
| DEVMETHOD(cryptodev_process, c7108_process), |
| DEVMETHOD(cryptodev_kprocess, NULL) |
| }; |
| |
| static int |
| cypher_7108_crypto_init(void) |
| { |
| dprintk("%s(%p)\n", __FUNCTION__, cypher_7108_crypto_init); |
| |
| iobar = (unsigned long)ioremap(CCU_AES_REG_BASE, 0x4000); |
| printk("7108: AES @ 0x%08x (0x%08x phys) %s mode\n", |
| iobar, CCU_AES_REG_BASE, |
| c7108_crypto_mode & C7108_AES_CTRL_MODE_CBC ? "CBC" : |
| c7108_crypto_mode & C7108_AES_CTRL_MODE_ECB ? "ECB" : |
| c7108_crypto_mode & C7108_AES_CTRL_MODE_CTR ? "CTR" : |
| c7108_crypto_mode & C7108_AES_CTRL_MODE_CFB ? "CFB" : |
| c7108_crypto_mode & C7108_AES_CTRL_MODE_OFB ? "OFB" : "???"); |
| csr_mutex = SPIN_LOCK_UNLOCKED; |
| |
| memset(&a7108dev, 0, sizeof(a7108dev)); |
| softc_device_init(&a7108dev, "aes7108", 0, a7108_methods); |
| |
| c7108_id = crypto_get_driverid(softc_get_device(&a7108dev), CRYPTOCAP_F_HARDWARE); |
| if (c7108_id < 0) |
| panic("7108: crypto device cannot initialize!"); |
| |
| // crypto_register(c7108_id, CRYPTO_AES_CBC, 0, 0, c7108_newsession, c7108_freesession, c7108_process, NULL); |
| crypto_register(c7108_id, CRYPTO_AES_CBC, 0, 0); |
| |
| return(0); |
| } |
| |
| static void |
| cypher_7108_crypto_exit(void) |
| { |
| dprintk("%s()\n", __FUNCTION__); |
| crypto_unregister_all(c7108_id); |
| c7108_id = -1; |
| } |
| |
| module_init(cypher_7108_crypto_init); |
| module_exit(cypher_7108_crypto_exit); |
| |
| MODULE_LICENSE("Dual BSD/GPL"); |
| MODULE_DESCRIPTION("Cypher 7108 Crypto (OCF module for kernel crypto)"); |