467 lines
12 KiB
C
467 lines
12 KiB
C
/**
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* AES CCM routines supporting the Power 7+ Nest Accelerators driver
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*
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* Copyright (C) 2012 International Business Machines Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 only.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Author: Kent Yoder <yoder1@us.ibm.com>
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*/
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#include <crypto/internal/aead.h>
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#include <crypto/aes.h>
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#include <crypto/algapi.h>
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#include <crypto/scatterwalk.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/crypto.h>
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#include <asm/vio.h>
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#include "nx_csbcpb.h"
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#include "nx.h"
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static int ccm_aes_nx_set_key(struct crypto_aead *tfm,
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const u8 *in_key,
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unsigned int key_len)
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{
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struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&tfm->base);
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struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
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struct nx_csbcpb *csbcpb_aead = nx_ctx->csbcpb_aead;
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nx_ctx_init(nx_ctx, HCOP_FC_AES);
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switch (key_len) {
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case AES_KEYSIZE_128:
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NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_128);
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NX_CPB_SET_KEY_SIZE(csbcpb_aead, NX_KS_AES_128);
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nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_128];
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break;
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default:
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return -EINVAL;
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}
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csbcpb->cpb.hdr.mode = NX_MODE_AES_CCM;
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memcpy(csbcpb->cpb.aes_ccm.key, in_key, key_len);
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csbcpb_aead->cpb.hdr.mode = NX_MODE_AES_CCA;
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memcpy(csbcpb_aead->cpb.aes_cca.key, in_key, key_len);
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return 0;
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}
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static int ccm4309_aes_nx_set_key(struct crypto_aead *tfm,
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const u8 *in_key,
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unsigned int key_len)
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{
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struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&tfm->base);
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if (key_len < 3)
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return -EINVAL;
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key_len -= 3;
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memcpy(nx_ctx->priv.ccm.nonce, in_key + key_len, 3);
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return ccm_aes_nx_set_key(tfm, in_key, key_len);
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}
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static int ccm_aes_nx_setauthsize(struct crypto_aead *tfm,
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unsigned int authsize)
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{
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switch (authsize) {
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case 4:
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case 6:
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case 8:
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case 10:
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case 12:
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case 14:
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case 16:
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break;
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default:
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return -EINVAL;
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}
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crypto_aead_crt(tfm)->authsize = authsize;
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return 0;
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}
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static int ccm4309_aes_nx_setauthsize(struct crypto_aead *tfm,
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unsigned int authsize)
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{
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switch (authsize) {
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case 8:
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case 12:
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case 16:
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break;
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default:
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return -EINVAL;
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}
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crypto_aead_crt(tfm)->authsize = authsize;
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return 0;
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}
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/* taken from crypto/ccm.c */
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static int set_msg_len(u8 *block, unsigned int msglen, int csize)
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{
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__be32 data;
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memset(block, 0, csize);
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block += csize;
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if (csize >= 4)
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csize = 4;
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else if (msglen > (unsigned int)(1 << (8 * csize)))
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return -EOVERFLOW;
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data = cpu_to_be32(msglen);
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memcpy(block - csize, (u8 *)&data + 4 - csize, csize);
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return 0;
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}
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/* taken from crypto/ccm.c */
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static inline int crypto_ccm_check_iv(const u8 *iv)
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{
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/* 2 <= L <= 8, so 1 <= L' <= 7. */
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if (1 > iv[0] || iv[0] > 7)
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return -EINVAL;
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return 0;
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}
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/* based on code from crypto/ccm.c */
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static int generate_b0(u8 *iv, unsigned int assoclen, unsigned int authsize,
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unsigned int cryptlen, u8 *b0)
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{
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unsigned int l, lp, m = authsize;
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int rc;
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memcpy(b0, iv, 16);
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lp = b0[0];
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l = lp + 1;
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/* set m, bits 3-5 */
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*b0 |= (8 * ((m - 2) / 2));
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/* set adata, bit 6, if associated data is used */
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if (assoclen)
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*b0 |= 64;
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rc = set_msg_len(b0 + 16 - l, cryptlen, l);
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return rc;
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}
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static int generate_pat(u8 *iv,
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struct aead_request *req,
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struct nx_crypto_ctx *nx_ctx,
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unsigned int authsize,
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unsigned int nbytes,
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u8 *out)
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{
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struct nx_sg *nx_insg = nx_ctx->in_sg;
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struct nx_sg *nx_outsg = nx_ctx->out_sg;
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unsigned int iauth_len = 0;
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struct vio_pfo_op *op = NULL;
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u8 tmp[16], *b1 = NULL, *b0 = NULL, *result = NULL;
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int rc;
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/* zero the ctr value */
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memset(iv + 15 - iv[0], 0, iv[0] + 1);
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if (!req->assoclen) {
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b0 = nx_ctx->csbcpb->cpb.aes_ccm.in_pat_or_b0;
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} else if (req->assoclen <= 14) {
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/* if associated data is 14 bytes or less, we do 1 GCM
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* operation on 2 AES blocks, B0 (stored in the csbcpb) and B1,
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* which is fed in through the source buffers here */
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b0 = nx_ctx->csbcpb->cpb.aes_ccm.in_pat_or_b0;
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b1 = nx_ctx->priv.ccm.iauth_tag;
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iauth_len = req->assoclen;
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nx_insg = nx_build_sg_list(nx_insg, b1, 16, nx_ctx->ap->sglen);
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nx_outsg = nx_build_sg_list(nx_outsg, tmp, 16,
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nx_ctx->ap->sglen);
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/* inlen should be negative, indicating to phyp that its a
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* pointer to an sg list */
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nx_ctx->op.inlen = (nx_ctx->in_sg - nx_insg) *
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sizeof(struct nx_sg);
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nx_ctx->op.outlen = (nx_ctx->out_sg - nx_outsg) *
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sizeof(struct nx_sg);
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NX_CPB_FDM(nx_ctx->csbcpb) |= NX_FDM_ENDE_ENCRYPT;
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NX_CPB_FDM(nx_ctx->csbcpb) |= NX_FDM_INTERMEDIATE;
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op = &nx_ctx->op;
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result = nx_ctx->csbcpb->cpb.aes_ccm.out_pat_or_mac;
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} else if (req->assoclen <= 65280) {
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/* if associated data is less than (2^16 - 2^8), we construct
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* B1 differently and feed in the associated data to a CCA
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* operation */
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b0 = nx_ctx->csbcpb_aead->cpb.aes_cca.b0;
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b1 = nx_ctx->csbcpb_aead->cpb.aes_cca.b1;
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iauth_len = 14;
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/* remaining assoc data must have scatterlist built for it */
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nx_insg = nx_walk_and_build(nx_insg, nx_ctx->ap->sglen,
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req->assoc, iauth_len,
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req->assoclen - iauth_len);
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nx_ctx->op_aead.inlen = (nx_ctx->in_sg - nx_insg) *
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sizeof(struct nx_sg);
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op = &nx_ctx->op_aead;
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result = nx_ctx->csbcpb_aead->cpb.aes_cca.out_pat_or_b0;
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} else {
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/* if associated data is less than (2^32), we construct B1
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* differently yet again and feed in the associated data to a
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* CCA operation */
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pr_err("associated data len is %u bytes (returning -EINVAL)\n",
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req->assoclen);
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rc = -EINVAL;
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}
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rc = generate_b0(iv, req->assoclen, authsize, nbytes, b0);
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if (rc)
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goto done;
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if (b1) {
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memset(b1, 0, 16);
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*(u16 *)b1 = (u16)req->assoclen;
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scatterwalk_map_and_copy(b1 + 2, req->assoc, 0,
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iauth_len, SCATTERWALK_FROM_SG);
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rc = nx_hcall_sync(nx_ctx, op,
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req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
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if (rc)
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goto done;
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atomic_inc(&(nx_ctx->stats->aes_ops));
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atomic64_add(req->assoclen, &(nx_ctx->stats->aes_bytes));
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memcpy(out, result, AES_BLOCK_SIZE);
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}
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done:
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return rc;
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}
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static int ccm_nx_decrypt(struct aead_request *req,
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struct blkcipher_desc *desc)
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{
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struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
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struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
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unsigned int nbytes = req->cryptlen;
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unsigned int authsize = crypto_aead_authsize(crypto_aead_reqtfm(req));
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struct nx_ccm_priv *priv = &nx_ctx->priv.ccm;
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int rc = -1;
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if (nbytes > nx_ctx->ap->databytelen)
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return -EINVAL;
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nbytes -= authsize;
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/* copy out the auth tag to compare with later */
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scatterwalk_map_and_copy(priv->oauth_tag,
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req->src, nbytes, authsize,
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SCATTERWALK_FROM_SG);
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rc = generate_pat(desc->info, req, nx_ctx, authsize, nbytes,
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csbcpb->cpb.aes_ccm.in_pat_or_b0);
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if (rc)
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goto out;
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rc = nx_build_sg_lists(nx_ctx, desc, req->dst, req->src, nbytes,
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csbcpb->cpb.aes_ccm.iv_or_ctr);
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if (rc)
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goto out;
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NX_CPB_FDM(nx_ctx->csbcpb) &= ~NX_FDM_ENDE_ENCRYPT;
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NX_CPB_FDM(nx_ctx->csbcpb) &= ~NX_FDM_INTERMEDIATE;
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rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
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req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
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if (rc)
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goto out;
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atomic_inc(&(nx_ctx->stats->aes_ops));
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atomic64_add(csbcpb->csb.processed_byte_count,
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&(nx_ctx->stats->aes_bytes));
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rc = memcmp(csbcpb->cpb.aes_ccm.out_pat_or_mac, priv->oauth_tag,
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authsize) ? -EBADMSG : 0;
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out:
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return rc;
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}
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static int ccm_nx_encrypt(struct aead_request *req,
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struct blkcipher_desc *desc)
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{
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struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
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struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
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unsigned int nbytes = req->cryptlen;
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unsigned int authsize = crypto_aead_authsize(crypto_aead_reqtfm(req));
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int rc = -1;
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if (nbytes > nx_ctx->ap->databytelen)
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return -EINVAL;
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rc = generate_pat(desc->info, req, nx_ctx, authsize, nbytes,
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csbcpb->cpb.aes_ccm.in_pat_or_b0);
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if (rc)
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goto out;
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rc = nx_build_sg_lists(nx_ctx, desc, req->dst, req->src, nbytes,
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csbcpb->cpb.aes_ccm.iv_or_ctr);
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if (rc)
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goto out;
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NX_CPB_FDM(csbcpb) |= NX_FDM_ENDE_ENCRYPT;
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NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
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rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
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req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
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if (rc)
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goto out;
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atomic_inc(&(nx_ctx->stats->aes_ops));
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atomic64_add(csbcpb->csb.processed_byte_count,
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&(nx_ctx->stats->aes_bytes));
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/* copy out the auth tag */
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scatterwalk_map_and_copy(csbcpb->cpb.aes_ccm.out_pat_or_mac,
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req->dst, nbytes, authsize,
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SCATTERWALK_TO_SG);
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out:
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return rc;
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}
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static int ccm4309_aes_nx_encrypt(struct aead_request *req)
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{
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struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
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struct blkcipher_desc desc;
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u8 *iv = nx_ctx->priv.ccm.iv;
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iv[0] = 3;
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memcpy(iv + 1, nx_ctx->priv.ccm.nonce, 3);
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memcpy(iv + 4, req->iv, 8);
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desc.info = iv;
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desc.tfm = (struct crypto_blkcipher *)req->base.tfm;
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return ccm_nx_encrypt(req, &desc);
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}
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static int ccm_aes_nx_encrypt(struct aead_request *req)
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{
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struct blkcipher_desc desc;
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int rc;
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desc.info = req->iv;
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desc.tfm = (struct crypto_blkcipher *)req->base.tfm;
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rc = crypto_ccm_check_iv(desc.info);
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if (rc)
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return rc;
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return ccm_nx_encrypt(req, &desc);
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}
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static int ccm4309_aes_nx_decrypt(struct aead_request *req)
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{
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struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
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struct blkcipher_desc desc;
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u8 *iv = nx_ctx->priv.ccm.iv;
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iv[0] = 3;
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memcpy(iv + 1, nx_ctx->priv.ccm.nonce, 3);
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memcpy(iv + 4, req->iv, 8);
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desc.info = iv;
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desc.tfm = (struct crypto_blkcipher *)req->base.tfm;
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return ccm_nx_decrypt(req, &desc);
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}
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static int ccm_aes_nx_decrypt(struct aead_request *req)
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{
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struct blkcipher_desc desc;
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int rc;
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desc.info = req->iv;
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desc.tfm = (struct crypto_blkcipher *)req->base.tfm;
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rc = crypto_ccm_check_iv(desc.info);
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if (rc)
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return rc;
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return ccm_nx_decrypt(req, &desc);
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}
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/* tell the block cipher walk routines that this is a stream cipher by
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* setting cra_blocksize to 1. Even using blkcipher_walk_virt_block
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* during encrypt/decrypt doesn't solve this problem, because it calls
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* blkcipher_walk_done under the covers, which doesn't use walk->blocksize,
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* but instead uses this tfm->blocksize. */
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struct crypto_alg nx_ccm_aes_alg = {
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.cra_name = "ccm(aes)",
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.cra_driver_name = "ccm-aes-nx",
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.cra_priority = 300,
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.cra_flags = CRYPTO_ALG_TYPE_AEAD |
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CRYPTO_ALG_NEED_FALLBACK,
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.cra_blocksize = 1,
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.cra_ctxsize = sizeof(struct nx_crypto_ctx),
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.cra_type = &crypto_aead_type,
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.cra_module = THIS_MODULE,
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.cra_init = nx_crypto_ctx_aes_ccm_init,
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.cra_exit = nx_crypto_ctx_exit,
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.cra_aead = {
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.ivsize = AES_BLOCK_SIZE,
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.maxauthsize = AES_BLOCK_SIZE,
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.setkey = ccm_aes_nx_set_key,
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.setauthsize = ccm_aes_nx_setauthsize,
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.encrypt = ccm_aes_nx_encrypt,
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.decrypt = ccm_aes_nx_decrypt,
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}
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};
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struct crypto_alg nx_ccm4309_aes_alg = {
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.cra_name = "rfc4309(ccm(aes))",
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.cra_driver_name = "rfc4309-ccm-aes-nx",
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.cra_priority = 300,
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.cra_flags = CRYPTO_ALG_TYPE_AEAD |
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CRYPTO_ALG_NEED_FALLBACK,
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.cra_blocksize = 1,
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.cra_ctxsize = sizeof(struct nx_crypto_ctx),
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.cra_type = &crypto_nivaead_type,
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.cra_module = THIS_MODULE,
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.cra_init = nx_crypto_ctx_aes_ccm_init,
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.cra_exit = nx_crypto_ctx_exit,
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.cra_aead = {
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.ivsize = 8,
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.maxauthsize = AES_BLOCK_SIZE,
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.setkey = ccm4309_aes_nx_set_key,
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.setauthsize = ccm4309_aes_nx_setauthsize,
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.encrypt = ccm4309_aes_nx_encrypt,
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.decrypt = ccm4309_aes_nx_decrypt,
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.geniv = "seqiv",
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}
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};
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