532 lines
14 KiB
C
532 lines
14 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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#include <linux/crypto.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/printk.h>
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#include <crypto/aes.h>
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#include <crypto/skcipher.h>
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#include <crypto/scatterwalk.h>
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#include <crypto/ctr.h>
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#include <crypto/internal/des.h>
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#include <crypto/xts.h>
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#include "nitrox_dev.h"
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#include "nitrox_common.h"
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#include "nitrox_req.h"
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struct nitrox_cipher {
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const char *name;
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enum flexi_cipher value;
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};
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/*
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* supported cipher list
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*/
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static const struct nitrox_cipher flexi_cipher_table[] = {
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{ "null", CIPHER_NULL },
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{ "cbc(des3_ede)", CIPHER_3DES_CBC },
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{ "ecb(des3_ede)", CIPHER_3DES_ECB },
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{ "cbc(aes)", CIPHER_AES_CBC },
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{ "ecb(aes)", CIPHER_AES_ECB },
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{ "cfb(aes)", CIPHER_AES_CFB },
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{ "rfc3686(ctr(aes))", CIPHER_AES_CTR },
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{ "xts(aes)", CIPHER_AES_XTS },
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{ "cts(cbc(aes))", CIPHER_AES_CBC_CTS },
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{ NULL, CIPHER_INVALID }
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};
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static enum flexi_cipher flexi_cipher_type(const char *name)
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{
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const struct nitrox_cipher *cipher = flexi_cipher_table;
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while (cipher->name) {
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if (!strcmp(cipher->name, name))
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break;
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cipher++;
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}
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return cipher->value;
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}
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static void free_src_sglist(struct skcipher_request *skreq)
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{
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struct nitrox_kcrypt_request *nkreq = skcipher_request_ctx(skreq);
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kfree(nkreq->src);
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}
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static void free_dst_sglist(struct skcipher_request *skreq)
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{
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struct nitrox_kcrypt_request *nkreq = skcipher_request_ctx(skreq);
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kfree(nkreq->dst);
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}
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static void nitrox_skcipher_callback(void *arg, int err)
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{
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struct skcipher_request *skreq = arg;
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free_src_sglist(skreq);
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free_dst_sglist(skreq);
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if (err) {
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pr_err_ratelimited("request failed status 0x%0x\n", err);
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err = -EINVAL;
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}
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skcipher_request_complete(skreq, err);
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}
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static void nitrox_cbc_cipher_callback(void *arg, int err)
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{
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struct skcipher_request *skreq = arg;
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struct nitrox_kcrypt_request *nkreq = skcipher_request_ctx(skreq);
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struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(skreq);
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int ivsize = crypto_skcipher_ivsize(cipher);
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unsigned int start = skreq->cryptlen - ivsize;
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if (err) {
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nitrox_skcipher_callback(arg, err);
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return;
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}
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if (nkreq->creq.ctrl.s.arg == ENCRYPT) {
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scatterwalk_map_and_copy(skreq->iv, skreq->dst, start, ivsize,
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0);
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} else {
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if (skreq->src != skreq->dst) {
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scatterwalk_map_and_copy(skreq->iv, skreq->src, start,
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ivsize, 0);
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} else {
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memcpy(skreq->iv, nkreq->iv_out, ivsize);
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kfree(nkreq->iv_out);
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}
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}
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nitrox_skcipher_callback(arg, err);
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}
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static int nitrox_skcipher_init(struct crypto_skcipher *tfm)
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{
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struct nitrox_crypto_ctx *nctx = crypto_skcipher_ctx(tfm);
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struct crypto_ctx_hdr *chdr;
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/* get the first device */
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nctx->ndev = nitrox_get_first_device();
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if (!nctx->ndev)
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return -ENODEV;
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/* allocate nitrox crypto context */
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chdr = crypto_alloc_context(nctx->ndev);
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if (!chdr) {
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nitrox_put_device(nctx->ndev);
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return -ENOMEM;
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}
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nctx->callback = nitrox_skcipher_callback;
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nctx->chdr = chdr;
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nctx->u.ctx_handle = (uintptr_t)((u8 *)chdr->vaddr +
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sizeof(struct ctx_hdr));
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crypto_skcipher_set_reqsize(tfm, crypto_skcipher_reqsize(tfm) +
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sizeof(struct nitrox_kcrypt_request));
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return 0;
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}
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static int nitrox_cbc_init(struct crypto_skcipher *tfm)
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{
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int err;
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struct nitrox_crypto_ctx *nctx = crypto_skcipher_ctx(tfm);
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err = nitrox_skcipher_init(tfm);
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if (err)
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return err;
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nctx->callback = nitrox_cbc_cipher_callback;
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return 0;
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}
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static void nitrox_skcipher_exit(struct crypto_skcipher *tfm)
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{
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struct nitrox_crypto_ctx *nctx = crypto_skcipher_ctx(tfm);
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/* free the nitrox crypto context */
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if (nctx->u.ctx_handle) {
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struct flexi_crypto_context *fctx = nctx->u.fctx;
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memzero_explicit(&fctx->crypto, sizeof(struct crypto_keys));
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memzero_explicit(&fctx->auth, sizeof(struct auth_keys));
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crypto_free_context((void *)nctx->chdr);
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}
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nitrox_put_device(nctx->ndev);
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nctx->u.ctx_handle = 0;
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nctx->ndev = NULL;
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}
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static inline int nitrox_skcipher_setkey(struct crypto_skcipher *cipher,
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int aes_keylen, const u8 *key,
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unsigned int keylen)
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{
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struct crypto_tfm *tfm = crypto_skcipher_tfm(cipher);
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struct nitrox_crypto_ctx *nctx = crypto_tfm_ctx(tfm);
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struct flexi_crypto_context *fctx;
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union fc_ctx_flags *flags;
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enum flexi_cipher cipher_type;
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const char *name;
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name = crypto_tfm_alg_name(tfm);
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cipher_type = flexi_cipher_type(name);
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if (unlikely(cipher_type == CIPHER_INVALID)) {
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pr_err("unsupported cipher: %s\n", name);
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return -EINVAL;
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}
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/* fill crypto context */
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fctx = nctx->u.fctx;
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flags = &fctx->flags;
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flags->f = 0;
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flags->w0.cipher_type = cipher_type;
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flags->w0.aes_keylen = aes_keylen;
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flags->w0.iv_source = IV_FROM_DPTR;
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flags->f = cpu_to_be64(*(u64 *)&flags->w0);
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/* copy the key to context */
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memcpy(fctx->crypto.u.key, key, keylen);
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return 0;
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}
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static int nitrox_aes_setkey(struct crypto_skcipher *cipher, const u8 *key,
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unsigned int keylen)
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{
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int aes_keylen;
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aes_keylen = flexi_aes_keylen(keylen);
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if (aes_keylen < 0)
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return -EINVAL;
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return nitrox_skcipher_setkey(cipher, aes_keylen, key, keylen);
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}
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static int alloc_src_sglist(struct skcipher_request *skreq, int ivsize)
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{
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struct nitrox_kcrypt_request *nkreq = skcipher_request_ctx(skreq);
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int nents = sg_nents(skreq->src) + 1;
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int ret;
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/* Allocate buffer to hold IV and input scatterlist array */
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ret = alloc_src_req_buf(nkreq, nents, ivsize);
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if (ret)
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return ret;
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nitrox_creq_copy_iv(nkreq->src, skreq->iv, ivsize);
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nitrox_creq_set_src_sg(nkreq, nents, ivsize, skreq->src,
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skreq->cryptlen);
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return 0;
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}
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static int alloc_dst_sglist(struct skcipher_request *skreq, int ivsize)
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{
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struct nitrox_kcrypt_request *nkreq = skcipher_request_ctx(skreq);
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int nents = sg_nents(skreq->dst) + 3;
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int ret;
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/* Allocate buffer to hold ORH, COMPLETION and output scatterlist
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* array
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*/
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ret = alloc_dst_req_buf(nkreq, nents);
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if (ret)
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return ret;
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nitrox_creq_set_orh(nkreq);
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nitrox_creq_set_comp(nkreq);
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nitrox_creq_set_dst_sg(nkreq, nents, ivsize, skreq->dst,
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skreq->cryptlen);
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return 0;
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}
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static int nitrox_skcipher_crypt(struct skcipher_request *skreq, bool enc)
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{
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struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(skreq);
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struct nitrox_crypto_ctx *nctx = crypto_skcipher_ctx(cipher);
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struct nitrox_kcrypt_request *nkreq = skcipher_request_ctx(skreq);
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int ivsize = crypto_skcipher_ivsize(cipher);
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struct se_crypto_request *creq;
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int ret;
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creq = &nkreq->creq;
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creq->flags = skreq->base.flags;
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creq->gfp = (skreq->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
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GFP_KERNEL : GFP_ATOMIC;
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/* fill the request */
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creq->ctrl.value = 0;
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creq->opcode = FLEXI_CRYPTO_ENCRYPT_HMAC;
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creq->ctrl.s.arg = (enc ? ENCRYPT : DECRYPT);
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/* param0: length of the data to be encrypted */
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creq->gph.param0 = cpu_to_be16(skreq->cryptlen);
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creq->gph.param1 = 0;
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/* param2: encryption data offset */
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creq->gph.param2 = cpu_to_be16(ivsize);
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creq->gph.param3 = 0;
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creq->ctx_handle = nctx->u.ctx_handle;
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creq->ctrl.s.ctxl = sizeof(struct flexi_crypto_context);
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ret = alloc_src_sglist(skreq, ivsize);
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if (ret)
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return ret;
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ret = alloc_dst_sglist(skreq, ivsize);
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if (ret) {
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free_src_sglist(skreq);
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return ret;
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}
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/* send the crypto request */
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return nitrox_process_se_request(nctx->ndev, creq, nctx->callback,
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skreq);
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}
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static int nitrox_cbc_decrypt(struct skcipher_request *skreq)
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{
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struct nitrox_kcrypt_request *nkreq = skcipher_request_ctx(skreq);
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struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(skreq);
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int ivsize = crypto_skcipher_ivsize(cipher);
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gfp_t flags = (skreq->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
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GFP_KERNEL : GFP_ATOMIC;
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unsigned int start = skreq->cryptlen - ivsize;
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if (skreq->src != skreq->dst)
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return nitrox_skcipher_crypt(skreq, false);
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nkreq->iv_out = kmalloc(ivsize, flags);
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if (!nkreq->iv_out)
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return -ENOMEM;
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scatterwalk_map_and_copy(nkreq->iv_out, skreq->src, start, ivsize, 0);
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return nitrox_skcipher_crypt(skreq, false);
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}
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static int nitrox_aes_encrypt(struct skcipher_request *skreq)
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{
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return nitrox_skcipher_crypt(skreq, true);
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}
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static int nitrox_aes_decrypt(struct skcipher_request *skreq)
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{
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return nitrox_skcipher_crypt(skreq, false);
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}
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static int nitrox_3des_setkey(struct crypto_skcipher *cipher,
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const u8 *key, unsigned int keylen)
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{
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return verify_skcipher_des3_key(cipher, key) ?:
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nitrox_skcipher_setkey(cipher, 0, key, keylen);
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}
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static int nitrox_3des_encrypt(struct skcipher_request *skreq)
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{
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return nitrox_skcipher_crypt(skreq, true);
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}
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static int nitrox_3des_decrypt(struct skcipher_request *skreq)
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{
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return nitrox_skcipher_crypt(skreq, false);
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}
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static int nitrox_aes_xts_setkey(struct crypto_skcipher *cipher,
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const u8 *key, unsigned int keylen)
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{
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struct nitrox_crypto_ctx *nctx = crypto_skcipher_ctx(cipher);
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struct flexi_crypto_context *fctx;
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int aes_keylen, ret;
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ret = xts_verify_key(cipher, key, keylen);
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if (ret)
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return ret;
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keylen /= 2;
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aes_keylen = flexi_aes_keylen(keylen);
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if (aes_keylen < 0)
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return -EINVAL;
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fctx = nctx->u.fctx;
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/* copy KEY2 */
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memcpy(fctx->auth.u.key2, (key + keylen), keylen);
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return nitrox_skcipher_setkey(cipher, aes_keylen, key, keylen);
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}
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static int nitrox_aes_ctr_rfc3686_setkey(struct crypto_skcipher *cipher,
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const u8 *key, unsigned int keylen)
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{
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struct nitrox_crypto_ctx *nctx = crypto_skcipher_ctx(cipher);
|
||
|
|
struct flexi_crypto_context *fctx;
|
||
|
|
int aes_keylen;
|
||
|
|
|
||
|
|
if (keylen < CTR_RFC3686_NONCE_SIZE)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
fctx = nctx->u.fctx;
|
||
|
|
|
||
|
|
memcpy(fctx->crypto.iv, key + (keylen - CTR_RFC3686_NONCE_SIZE),
|
||
|
|
CTR_RFC3686_NONCE_SIZE);
|
||
|
|
|
||
|
|
keylen -= CTR_RFC3686_NONCE_SIZE;
|
||
|
|
|
||
|
|
aes_keylen = flexi_aes_keylen(keylen);
|
||
|
|
if (aes_keylen < 0)
|
||
|
|
return -EINVAL;
|
||
|
|
return nitrox_skcipher_setkey(cipher, aes_keylen, key, keylen);
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct skcipher_alg nitrox_skciphers[] = { {
|
||
|
|
.base = {
|
||
|
|
.cra_name = "cbc(aes)",
|
||
|
|
.cra_driver_name = "n5_cbc(aes)",
|
||
|
|
.cra_priority = PRIO,
|
||
|
|
.cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY,
|
||
|
|
.cra_blocksize = AES_BLOCK_SIZE,
|
||
|
|
.cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
|
||
|
|
.cra_alignmask = 0,
|
||
|
|
.cra_module = THIS_MODULE,
|
||
|
|
},
|
||
|
|
.min_keysize = AES_MIN_KEY_SIZE,
|
||
|
|
.max_keysize = AES_MAX_KEY_SIZE,
|
||
|
|
.ivsize = AES_BLOCK_SIZE,
|
||
|
|
.setkey = nitrox_aes_setkey,
|
||
|
|
.encrypt = nitrox_aes_encrypt,
|
||
|
|
.decrypt = nitrox_cbc_decrypt,
|
||
|
|
.init = nitrox_cbc_init,
|
||
|
|
.exit = nitrox_skcipher_exit,
|
||
|
|
}, {
|
||
|
|
.base = {
|
||
|
|
.cra_name = "ecb(aes)",
|
||
|
|
.cra_driver_name = "n5_ecb(aes)",
|
||
|
|
.cra_priority = PRIO,
|
||
|
|
.cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY,
|
||
|
|
.cra_blocksize = AES_BLOCK_SIZE,
|
||
|
|
.cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
|
||
|
|
.cra_alignmask = 0,
|
||
|
|
.cra_module = THIS_MODULE,
|
||
|
|
},
|
||
|
|
.min_keysize = AES_MIN_KEY_SIZE,
|
||
|
|
.max_keysize = AES_MAX_KEY_SIZE,
|
||
|
|
.ivsize = AES_BLOCK_SIZE,
|
||
|
|
.setkey = nitrox_aes_setkey,
|
||
|
|
.encrypt = nitrox_aes_encrypt,
|
||
|
|
.decrypt = nitrox_aes_decrypt,
|
||
|
|
.init = nitrox_skcipher_init,
|
||
|
|
.exit = nitrox_skcipher_exit,
|
||
|
|
}, {
|
||
|
|
.base = {
|
||
|
|
.cra_name = "xts(aes)",
|
||
|
|
.cra_driver_name = "n5_xts(aes)",
|
||
|
|
.cra_priority = PRIO,
|
||
|
|
.cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY,
|
||
|
|
.cra_blocksize = AES_BLOCK_SIZE,
|
||
|
|
.cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
|
||
|
|
.cra_alignmask = 0,
|
||
|
|
.cra_module = THIS_MODULE,
|
||
|
|
},
|
||
|
|
.min_keysize = 2 * AES_MIN_KEY_SIZE,
|
||
|
|
.max_keysize = 2 * AES_MAX_KEY_SIZE,
|
||
|
|
.ivsize = AES_BLOCK_SIZE,
|
||
|
|
.setkey = nitrox_aes_xts_setkey,
|
||
|
|
.encrypt = nitrox_aes_encrypt,
|
||
|
|
.decrypt = nitrox_aes_decrypt,
|
||
|
|
.init = nitrox_skcipher_init,
|
||
|
|
.exit = nitrox_skcipher_exit,
|
||
|
|
}, {
|
||
|
|
.base = {
|
||
|
|
.cra_name = "rfc3686(ctr(aes))",
|
||
|
|
.cra_driver_name = "n5_rfc3686(ctr(aes))",
|
||
|
|
.cra_priority = PRIO,
|
||
|
|
.cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY,
|
||
|
|
.cra_blocksize = 1,
|
||
|
|
.cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
|
||
|
|
.cra_alignmask = 0,
|
||
|
|
.cra_module = THIS_MODULE,
|
||
|
|
},
|
||
|
|
.min_keysize = AES_MIN_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
|
||
|
|
.max_keysize = AES_MAX_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
|
||
|
|
.ivsize = CTR_RFC3686_IV_SIZE,
|
||
|
|
.init = nitrox_skcipher_init,
|
||
|
|
.exit = nitrox_skcipher_exit,
|
||
|
|
.setkey = nitrox_aes_ctr_rfc3686_setkey,
|
||
|
|
.encrypt = nitrox_aes_encrypt,
|
||
|
|
.decrypt = nitrox_aes_decrypt,
|
||
|
|
}, {
|
||
|
|
.base = {
|
||
|
|
.cra_name = "cts(cbc(aes))",
|
||
|
|
.cra_driver_name = "n5_cts(cbc(aes))",
|
||
|
|
.cra_priority = PRIO,
|
||
|
|
.cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY,
|
||
|
|
.cra_blocksize = AES_BLOCK_SIZE,
|
||
|
|
.cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
|
||
|
|
.cra_alignmask = 0,
|
||
|
|
.cra_module = THIS_MODULE,
|
||
|
|
},
|
||
|
|
.min_keysize = AES_MIN_KEY_SIZE,
|
||
|
|
.max_keysize = AES_MAX_KEY_SIZE,
|
||
|
|
.ivsize = AES_BLOCK_SIZE,
|
||
|
|
.setkey = nitrox_aes_setkey,
|
||
|
|
.encrypt = nitrox_aes_encrypt,
|
||
|
|
.decrypt = nitrox_aes_decrypt,
|
||
|
|
.init = nitrox_skcipher_init,
|
||
|
|
.exit = nitrox_skcipher_exit,
|
||
|
|
}, {
|
||
|
|
.base = {
|
||
|
|
.cra_name = "cbc(des3_ede)",
|
||
|
|
.cra_driver_name = "n5_cbc(des3_ede)",
|
||
|
|
.cra_priority = PRIO,
|
||
|
|
.cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY,
|
||
|
|
.cra_blocksize = DES3_EDE_BLOCK_SIZE,
|
||
|
|
.cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
|
||
|
|
.cra_alignmask = 0,
|
||
|
|
.cra_module = THIS_MODULE,
|
||
|
|
},
|
||
|
|
.min_keysize = DES3_EDE_KEY_SIZE,
|
||
|
|
.max_keysize = DES3_EDE_KEY_SIZE,
|
||
|
|
.ivsize = DES3_EDE_BLOCK_SIZE,
|
||
|
|
.setkey = nitrox_3des_setkey,
|
||
|
|
.encrypt = nitrox_3des_encrypt,
|
||
|
|
.decrypt = nitrox_cbc_decrypt,
|
||
|
|
.init = nitrox_cbc_init,
|
||
|
|
.exit = nitrox_skcipher_exit,
|
||
|
|
}, {
|
||
|
|
.base = {
|
||
|
|
.cra_name = "ecb(des3_ede)",
|
||
|
|
.cra_driver_name = "n5_ecb(des3_ede)",
|
||
|
|
.cra_priority = PRIO,
|
||
|
|
.cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY,
|
||
|
|
.cra_blocksize = DES3_EDE_BLOCK_SIZE,
|
||
|
|
.cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
|
||
|
|
.cra_alignmask = 0,
|
||
|
|
.cra_module = THIS_MODULE,
|
||
|
|
},
|
||
|
|
.min_keysize = DES3_EDE_KEY_SIZE,
|
||
|
|
.max_keysize = DES3_EDE_KEY_SIZE,
|
||
|
|
.ivsize = DES3_EDE_BLOCK_SIZE,
|
||
|
|
.setkey = nitrox_3des_setkey,
|
||
|
|
.encrypt = nitrox_3des_encrypt,
|
||
|
|
.decrypt = nitrox_3des_decrypt,
|
||
|
|
.init = nitrox_skcipher_init,
|
||
|
|
.exit = nitrox_skcipher_exit,
|
||
|
|
}
|
||
|
|
|
||
|
|
};
|
||
|
|
|
||
|
|
int nitrox_register_skciphers(void)
|
||
|
|
{
|
||
|
|
return crypto_register_skciphers(nitrox_skciphers,
|
||
|
|
ARRAY_SIZE(nitrox_skciphers));
|
||
|
|
}
|
||
|
|
|
||
|
|
void nitrox_unregister_skciphers(void)
|
||
|
|
{
|
||
|
|
crypto_unregister_skciphers(nitrox_skciphers,
|
||
|
|
ARRAY_SIZE(nitrox_skciphers));
|
||
|
|
}
|