840 lines
24 KiB
C
840 lines
24 KiB
C
/*
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* Copyright (C) 2006 Micronas USA
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Effort sponsored in part by the Defense Advanced Research Projects
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* Agency (DARPA) and Air Force Research Laboratory, Air Force
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* Materiel Command, USAF, under agreement number F30602-01-2-0537.
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*
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*/
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//#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/wait.h>
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#include <linux/crypto.h>
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#include <linux/mm.h>
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#include <linux/skbuff.h>
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#include <linux/random.h>
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#include <asm/io.h>
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#include <asm/delay.h>
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//#include <asm/scatterlist.h>
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#include <linux/scatterlist.h>
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#include <linux/dma-mapping.h>
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#include <linux/highmem.h>
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#include <cryptodev.h>
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#include <uio.h>
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#include <aes-7108.h>
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/* Runtime mode */
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static int c7108_crypto_mode = C7108_AES_CTRL_MODE_CTR;
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//static int c7108_crypto_mode = C7108_AES_CTRL_MODE_CBC;
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static int32_t c7108_id = -1;
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static struct cipher_7108 **c7108_sessions = NULL;
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static u_int32_t c7108_sesnum = 0;
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static unsigned long iobar;
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/* Crypto entry points */
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static int c7108_process(void *, struct cryptop *, int);
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static int c7108_newsession(void *, u_int32_t *, struct cryptoini *);
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static int c7108_freesession(void *, u_int64_t);
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/* Globals */
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static int debug = 0;
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static spinlock_t csr_mutex;
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/* Generic controller-based lock */
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#define AES_LOCK()\
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spin_lock(&csr_mutex)
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#define AES_UNLOCK()\
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spin_unlock(&csr_mutex)
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/* 7108 AES register access */
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#define c7108_reg_wr8(a,d) iowrite8(d, (void*)(iobar+(a)))
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#define c7108_reg_wr16(a,d) iowrite16(d, (void*)(iobar+(a)))
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#define c7108_reg_wr32(a,d) iowrite32(d, (void*)(iobar+(a)))
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#define c7108_reg_rd8(a) ioread8((void*)(iobar+(a)))
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#define c7108_reg_rd16(a) ioread16((void*)(iobar+(a)))
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#define c7108_reg_rd32(a) ioread32((void*)(iobar+(a)))
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static int
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c7108_xlate_key(int klen, u8* k8ptr, u32* k32ptr)
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{
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int i, nw=0;
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nw = ((klen >= 256) ? 8 : (klen >= 192) ? 6 : 4);
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for ( i = 0; i < nw; i++) {
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k32ptr[i] = (k8ptr[i+3] << 24) | (k8ptr[i+2] << 16) |
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(k8ptr[i+1] << 8) | k8ptr[i];
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}
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return 0;
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}
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static int
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c7108_cache_key(int klen, u32* k32ptr, u8* k8ptr)
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{
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int i, nb=0;
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u8* ptr = (u8*)k32ptr;
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nb = ((klen >= 256) ? 32 : (klen >= 192) ? 24 : 16);
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for ( i = 0; i < nb; i++)
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k8ptr[i] = ptr[i];
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return 0;
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}
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static int
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c7108_aes_setup_dma(u32 src, u32 dst, u32 len)
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{
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if (len < 16) {
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printk("len < 16\n");
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return -10;
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}
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if (len % 16) {
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printk("len not multiple of 16\n");
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return -11;
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}
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c7108_reg_wr16(C7108_AES_DMA_SRC0_LO, (u16) src);
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c7108_reg_wr16(C7108_AES_DMA_SRC0_HI, (u16)((src & 0xffff0000) >> 16));
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c7108_reg_wr16(C7108_AES_DMA_DST0_LO, (u16) dst);
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c7108_reg_wr16(C7108_AES_DMA_DST0_HI, (u16)((dst & 0xffff0000) >> 16));
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c7108_reg_wr16(C7108_AES_DMA_LEN, (u16) ((len / 16) - 1));
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return 0;
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}
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static int
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c7108_aes_set_hw_iv(u8 iv[16])
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{
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c7108_reg_wr16(C7108_AES_IV0_LO, (u16) ((iv[1] << 8) | iv[0]));
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c7108_reg_wr16(C7108_AES_IV0_HI, (u16) ((iv[3] << 8) | iv[2]));
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c7108_reg_wr16(C7108_AES_IV1_LO, (u16) ((iv[5] << 8) | iv[4]));
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c7108_reg_wr16(C7108_AES_IV1_HI, (u16) ((iv[7] << 8) | iv[6]));
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c7108_reg_wr16(C7108_AES_IV2_LO, (u16) ((iv[9] << 8) | iv[8]));
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c7108_reg_wr16(C7108_AES_IV2_HI, (u16) ((iv[11] << 8) | iv[10]));
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c7108_reg_wr16(C7108_AES_IV3_LO, (u16) ((iv[13] << 8) | iv[12]));
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c7108_reg_wr16(C7108_AES_IV3_HI, (u16) ((iv[15] << 8) | iv[14]));
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return 0;
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}
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static void
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c7108_aes_read_dkey(u32 * dkey)
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{
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dkey[0] = (c7108_reg_rd16(C7108_AES_EKEY0_HI) << 16) |
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c7108_reg_rd16(C7108_AES_EKEY0_LO);
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dkey[1] = (c7108_reg_rd16(C7108_AES_EKEY1_HI) << 16) |
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c7108_reg_rd16(C7108_AES_EKEY1_LO);
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dkey[2] = (c7108_reg_rd16(C7108_AES_EKEY2_HI) << 16) |
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c7108_reg_rd16(C7108_AES_EKEY2_LO);
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dkey[3] = (c7108_reg_rd16(C7108_AES_EKEY3_HI) << 16) |
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c7108_reg_rd16(C7108_AES_EKEY3_LO);
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dkey[4] = (c7108_reg_rd16(C7108_AES_EKEY4_HI) << 16) |
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c7108_reg_rd16(C7108_AES_EKEY4_LO);
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dkey[5] = (c7108_reg_rd16(C7108_AES_EKEY5_HI) << 16) |
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c7108_reg_rd16(C7108_AES_EKEY5_LO);
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dkey[6] = (c7108_reg_rd16(C7108_AES_EKEY6_HI) << 16) |
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c7108_reg_rd16(C7108_AES_EKEY6_LO);
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dkey[7] = (c7108_reg_rd16(C7108_AES_EKEY7_HI) << 16) |
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c7108_reg_rd16(C7108_AES_EKEY7_LO);
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}
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static int
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c7108_aes_cipher(int op,
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u32 dst,
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u32 src,
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u32 len,
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int klen,
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u16 mode,
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u32 key[8],
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u8 iv[16])
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{
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int rv = 0, cnt=0;
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u16 ctrl = 0, stat = 0;
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AES_LOCK();
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/* Setup key length */
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if (klen == 128) {
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ctrl |= C7108_AES_KEY_LEN_128;
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} else if (klen == 192) {
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ctrl |= C7108_AES_KEY_LEN_192;
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} else if (klen == 256) {
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ctrl |= C7108_AES_KEY_LEN_256;
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} else {
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AES_UNLOCK();
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return -3;
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}
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/* Check opcode */
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if (C7108_AES_ENCRYPT == op) {
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ctrl |= C7108_AES_ENCRYPT;
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} else if (C7108_AES_DECRYPT == op) {
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ctrl |= C7108_AES_DECRYPT;
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} else {
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AES_UNLOCK();
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return -4;
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}
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/* check mode */
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if ( (mode != C7108_AES_CTRL_MODE_CBC) &&
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(mode != C7108_AES_CTRL_MODE_CFB) &&
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(mode != C7108_AES_CTRL_MODE_OFB) &&
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(mode != C7108_AES_CTRL_MODE_CTR) &&
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(mode != C7108_AES_CTRL_MODE_ECB) ) {
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AES_UNLOCK();
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return -5;
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}
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/* Now set mode */
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ctrl |= mode;
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/* For CFB, OFB, and CTR, neither backward key
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* expansion nor key inversion is required.
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*/
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if ( (C7108_AES_DECRYPT == op) &&
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(C7108_AES_CTRL_MODE_CBC == mode ||
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C7108_AES_CTRL_MODE_ECB == mode ) ){
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/* Program Key */
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c7108_reg_wr16(C7108_AES_KEY0_LO, (u16) key[4]);
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c7108_reg_wr16(C7108_AES_KEY0_HI, (u16) (key[4] >> 16));
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c7108_reg_wr16(C7108_AES_KEY1_LO, (u16) key[5]);
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c7108_reg_wr16(C7108_AES_KEY1_HI, (u16) (key[5] >> 16));
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c7108_reg_wr16(C7108_AES_KEY2_LO, (u16) key[6]);
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c7108_reg_wr16(C7108_AES_KEY2_HI, (u16) (key[6] >> 16));
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c7108_reg_wr16(C7108_AES_KEY3_LO, (u16) key[7]);
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c7108_reg_wr16(C7108_AES_KEY3_HI, (u16) (key[7] >> 16));
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c7108_reg_wr16(C7108_AES_KEY6_LO, (u16) key[2]);
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c7108_reg_wr16(C7108_AES_KEY6_HI, (u16) (key[2] >> 16));
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c7108_reg_wr16(C7108_AES_KEY7_LO, (u16) key[3]);
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c7108_reg_wr16(C7108_AES_KEY7_HI, (u16) (key[3] >> 16));
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if (192 == klen) {
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c7108_reg_wr16(C7108_AES_KEY4_LO, (u16) key[7]);
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c7108_reg_wr16(C7108_AES_KEY4_HI, (u16) (key[7] >> 16));
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c7108_reg_wr16(C7108_AES_KEY5_LO, (u16) key[7]);
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c7108_reg_wr16(C7108_AES_KEY5_HI, (u16) (key[7] >> 16));
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} else if (256 == klen) {
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/* 256 */
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c7108_reg_wr16(C7108_AES_KEY4_LO, (u16) key[0]);
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c7108_reg_wr16(C7108_AES_KEY4_HI, (u16) (key[0] >> 16));
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c7108_reg_wr16(C7108_AES_KEY5_LO, (u16) key[1]);
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c7108_reg_wr16(C7108_AES_KEY5_HI, (u16) (key[1] >> 16));
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}
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} else {
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/* Program Key */
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c7108_reg_wr16(C7108_AES_KEY0_LO, (u16) key[0]);
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c7108_reg_wr16(C7108_AES_KEY0_HI, (u16) (key[0] >> 16));
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c7108_reg_wr16(C7108_AES_KEY1_LO, (u16) key[1]);
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c7108_reg_wr16(C7108_AES_KEY1_HI, (u16) (key[1] >> 16));
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c7108_reg_wr16(C7108_AES_KEY2_LO, (u16) key[2]);
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c7108_reg_wr16(C7108_AES_KEY2_HI, (u16) (key[2] >> 16));
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c7108_reg_wr16(C7108_AES_KEY3_LO, (u16) key[3]);
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c7108_reg_wr16(C7108_AES_KEY3_HI, (u16) (key[3] >> 16));
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c7108_reg_wr16(C7108_AES_KEY4_LO, (u16) key[4]);
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c7108_reg_wr16(C7108_AES_KEY4_HI, (u16) (key[4] >> 16));
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c7108_reg_wr16(C7108_AES_KEY5_LO, (u16) key[5]);
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c7108_reg_wr16(C7108_AES_KEY5_HI, (u16) (key[5] >> 16));
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c7108_reg_wr16(C7108_AES_KEY6_LO, (u16) key[6]);
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c7108_reg_wr16(C7108_AES_KEY6_HI, (u16) (key[6] >> 16));
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c7108_reg_wr16(C7108_AES_KEY7_LO, (u16) key[7]);
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c7108_reg_wr16(C7108_AES_KEY7_HI, (u16) (key[7] >> 16));
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}
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/* Set IV always */
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c7108_aes_set_hw_iv(iv);
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/* Program DMA addresses */
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if ((rv = c7108_aes_setup_dma(src, dst, len)) < 0) {
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AES_UNLOCK();
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return rv;
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}
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/* Start AES cipher */
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c7108_reg_wr16(C7108_AES_CTRL, ctrl | C7108_AES_GO);
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//printk("Ctrl: 0x%x\n", ctrl | C7108_AES_GO);
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do {
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/* TODO: interrupt mode */
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// printk("aes_stat=0x%x\n", stat);
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//udelay(100);
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} while ((cnt++ < 1000000) &&
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!((stat=c7108_reg_rd16(C7108_AES_CTRL))&C7108_AES_OP_DONE));
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if ((mode == C7108_AES_CTRL_MODE_ECB)||
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(mode == C7108_AES_CTRL_MODE_CBC)) {
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/* Save out key when the lock is held ... */
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c7108_aes_read_dkey(key);
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}
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AES_UNLOCK();
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return 0;
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}
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/*
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* Generate a new crypto device session.
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*/
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static int
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c7108_newsession(void *arg, u_int32_t *sid, struct cryptoini *cri)
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{
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struct cipher_7108 **swd;
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u_int32_t i;
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char *algo;
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int mode, xfm_type;
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dprintk("%s()\n", __FUNCTION__);
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if (sid == NULL || cri == NULL) {
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dprintk("%s,%d - EINVAL\n", __FILE__, __LINE__);
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return EINVAL;
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}
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if (c7108_sessions) {
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for (i = 1; i < c7108_sesnum; i++)
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if (c7108_sessions[i] == NULL)
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break;
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} else
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i = 1; /* NB: to silence compiler warning */
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if (c7108_sessions == NULL || i == c7108_sesnum) {
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if (c7108_sessions == NULL) {
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i = 1; /* We leave c7108_sessions[0] empty */
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c7108_sesnum = CRYPTO_SW_SESSIONS;
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} else
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c7108_sesnum *= 2;
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swd = kmalloc(c7108_sesnum * sizeof(struct cipher_7108 *),
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GFP_ATOMIC);
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if (swd == NULL) {
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/* Reset session number */
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if (c7108_sesnum == CRYPTO_SW_SESSIONS)
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c7108_sesnum = 0;
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else
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c7108_sesnum /= 2;
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dprintk("%s,%d: ENOBUFS\n", __FILE__, __LINE__);
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return ENOBUFS;
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}
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memset(swd, 0, c7108_sesnum * sizeof(struct cipher_7108 *));
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/* Copy existing sessions */
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if (c7108_sessions) {
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memcpy(swd, c7108_sessions,
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(c7108_sesnum / 2) * sizeof(struct cipher_7108 *));
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kfree(c7108_sessions);
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}
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c7108_sessions = swd;
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}
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swd = &c7108_sessions[i];
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*sid = i;
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while (cri) {
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*swd = (struct cipher_7108 *)
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kmalloc(sizeof(struct cipher_7108), GFP_ATOMIC);
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if (*swd == NULL) {
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c7108_freesession(NULL, i);
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dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__);
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return ENOBUFS;
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}
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memset(*swd, 0, sizeof(struct cipher_7108));
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algo = NULL;
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mode = 0;
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xfm_type = HW_TYPE_CIPHER;
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switch (cri->cri_alg) {
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case CRYPTO_AES_CBC:
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algo = "aes";
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mode = CRYPTO_TFM_MODE_CBC;
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c7108_crypto_mode = C7108_AES_CTRL_MODE_CBC;
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break;
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#if 0
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case CRYPTO_AES_CTR:
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algo = "aes_ctr";
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mode = CRYPTO_TFM_MODE_CBC;
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c7108_crypto_mode = C7108_AES_CTRL_MODE_CTR;
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break;
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case CRYPTO_AES_ECB:
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algo = "aes_ecb";
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mode = CRYPTO_TFM_MODE_CBC;
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c7108_crypto_mode = C7108_AES_CTRL_MODE_ECB;
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break;
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case CRYPTO_AES_OFB:
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algo = "aes_ofb";
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mode = CRYPTO_TFM_MODE_CBC;
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c7108_crypto_mode = C7108_AES_CTRL_MODE_OFB;
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break;
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case CRYPTO_AES_CFB:
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algo = "aes_cfb";
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mode = CRYPTO_TFM_MODE_CBC;
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c7108_crypto_mode = C7108_AES_CTRL_MODE_CFB;
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break;
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#endif
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default:
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printk("unsupported crypto algorithm: %d\n",
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cri->cri_alg);
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return -EINVAL;
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break;
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}
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if (!algo || !*algo) {
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printk("cypher_7108_crypto: Unknown algo 0x%x\n",
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cri->cri_alg);
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c7108_freesession(NULL, i);
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return EINVAL;
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}
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if (xfm_type == HW_TYPE_CIPHER) {
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if (debug) {
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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_shinfo(skb)->frags[i].page;
|
|
//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_shinfo(skb)->frags[i].page, 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;
|
|
}
|
|
|
|
|
|
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)");
|