568 lines
14 KiB
C
568 lines
14 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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#include <linux/kernel.h>
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#include <linux/printk.h>
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#include <linux/crypto.h>
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#include <linux/rtnetlink.h>
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#include <crypto/aead.h>
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#include <crypto/authenc.h>
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#include <crypto/des.h>
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#include <crypto/internal/aead.h>
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#include <crypto/scatterwalk.h>
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#include <crypto/gcm.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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#define GCM_AES_SALT_SIZE 4
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union gph_p3 {
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struct {
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#ifdef __BIG_ENDIAN_BITFIELD
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u16 iv_offset : 8;
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u16 auth_offset : 8;
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#else
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u16 auth_offset : 8;
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u16 iv_offset : 8;
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#endif
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};
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u16 param;
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};
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static int nitrox_aes_gcm_setkey(struct crypto_aead *aead, 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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struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
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struct flexi_crypto_context *fctx;
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union fc_ctx_flags flags;
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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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/* fill crypto context */
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fctx = nctx->u.fctx;
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flags.fu = be64_to_cpu(fctx->flags.f);
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flags.w0.aes_keylen = aes_keylen;
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fctx->flags.f = cpu_to_be64(flags.fu);
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/* copy enc key to context */
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memset(&fctx->crypto, 0, sizeof(fctx->crypto));
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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_aead_setauthsize(struct crypto_aead *aead,
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unsigned int authsize)
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{
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struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
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struct flexi_crypto_context *fctx = nctx->u.fctx;
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union fc_ctx_flags flags;
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flags.fu = be64_to_cpu(fctx->flags.f);
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flags.w0.mac_len = authsize;
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fctx->flags.f = cpu_to_be64(flags.fu);
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aead->authsize = authsize;
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return 0;
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}
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static int nitrox_aes_gcm_setauthsize(struct crypto_aead *aead,
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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 8:
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case 12:
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case 13:
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case 14:
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case 15:
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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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return nitrox_aead_setauthsize(aead, authsize);
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}
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static int alloc_src_sglist(struct nitrox_kcrypt_request *nkreq,
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struct scatterlist *src, char *iv, int ivsize,
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int buflen)
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{
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int nents = sg_nents_for_len(src, buflen);
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int ret;
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if (nents < 0)
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return nents;
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/* IV entry */
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nents += 1;
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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, iv, ivsize);
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nitrox_creq_set_src_sg(nkreq, nents, ivsize, src, buflen);
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return 0;
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}
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static int alloc_dst_sglist(struct nitrox_kcrypt_request *nkreq,
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struct scatterlist *dst, int ivsize, int buflen)
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{
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int nents = sg_nents_for_len(dst, buflen);
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int ret;
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if (nents < 0)
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return nents;
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/* IV, ORH, COMPLETION entries */
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nents += 3;
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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, dst, buflen);
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return 0;
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}
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static void free_src_sglist(struct nitrox_kcrypt_request *nkreq)
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{
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kfree(nkreq->src);
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}
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static void free_dst_sglist(struct nitrox_kcrypt_request *nkreq)
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{
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kfree(nkreq->dst);
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}
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static int nitrox_set_creq(struct nitrox_aead_rctx *rctx)
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{
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struct se_crypto_request *creq = &rctx->nkreq.creq;
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union gph_p3 param3;
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int ret;
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creq->flags = rctx->flags;
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creq->gfp = (rctx->flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? GFP_KERNEL :
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GFP_ATOMIC;
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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 = rctx->ctrl_arg;
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creq->gph.param0 = cpu_to_be16(rctx->cryptlen);
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creq->gph.param1 = cpu_to_be16(rctx->cryptlen + rctx->assoclen);
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creq->gph.param2 = cpu_to_be16(rctx->ivsize + rctx->assoclen);
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param3.iv_offset = 0;
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param3.auth_offset = rctx->ivsize;
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creq->gph.param3 = cpu_to_be16(param3.param);
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creq->ctx_handle = rctx->ctx_handle;
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creq->ctrl.s.ctxl = sizeof(struct flexi_crypto_context);
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ret = alloc_src_sglist(&rctx->nkreq, rctx->src, rctx->iv, rctx->ivsize,
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rctx->srclen);
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if (ret)
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return ret;
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ret = alloc_dst_sglist(&rctx->nkreq, rctx->dst, rctx->ivsize,
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rctx->dstlen);
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if (ret) {
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free_src_sglist(&rctx->nkreq);
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return ret;
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}
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return 0;
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}
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static void nitrox_aead_callback(void *arg, int err)
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{
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struct aead_request *areq = arg;
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struct nitrox_aead_rctx *rctx = aead_request_ctx(areq);
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free_src_sglist(&rctx->nkreq);
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free_dst_sglist(&rctx->nkreq);
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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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aead_request_complete(areq, err);
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}
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static inline bool nitrox_aes_gcm_assoclen_supported(unsigned int assoclen)
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{
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if (assoclen <= 512)
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return true;
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return false;
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}
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static int nitrox_aes_gcm_enc(struct aead_request *areq)
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{
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struct crypto_aead *aead = crypto_aead_reqtfm(areq);
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struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
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struct nitrox_aead_rctx *rctx = aead_request_ctx(areq);
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struct se_crypto_request *creq = &rctx->nkreq.creq;
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struct flexi_crypto_context *fctx = nctx->u.fctx;
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int ret;
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if (!nitrox_aes_gcm_assoclen_supported(areq->assoclen))
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return -EINVAL;
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memcpy(fctx->crypto.iv, areq->iv, GCM_AES_SALT_SIZE);
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rctx->cryptlen = areq->cryptlen;
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rctx->assoclen = areq->assoclen;
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rctx->srclen = areq->assoclen + areq->cryptlen;
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rctx->dstlen = rctx->srclen + aead->authsize;
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rctx->iv = &areq->iv[GCM_AES_SALT_SIZE];
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rctx->ivsize = GCM_AES_IV_SIZE - GCM_AES_SALT_SIZE;
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rctx->flags = areq->base.flags;
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rctx->ctx_handle = nctx->u.ctx_handle;
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rctx->src = areq->src;
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rctx->dst = areq->dst;
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rctx->ctrl_arg = ENCRYPT;
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ret = nitrox_set_creq(rctx);
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if (ret)
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return ret;
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/* send the crypto request */
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return nitrox_process_se_request(nctx->ndev, creq, nitrox_aead_callback,
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areq);
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}
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static int nitrox_aes_gcm_dec(struct aead_request *areq)
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{
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struct crypto_aead *aead = crypto_aead_reqtfm(areq);
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struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
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struct nitrox_aead_rctx *rctx = aead_request_ctx(areq);
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struct se_crypto_request *creq = &rctx->nkreq.creq;
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struct flexi_crypto_context *fctx = nctx->u.fctx;
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int ret;
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if (!nitrox_aes_gcm_assoclen_supported(areq->assoclen))
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return -EINVAL;
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memcpy(fctx->crypto.iv, areq->iv, GCM_AES_SALT_SIZE);
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rctx->cryptlen = areq->cryptlen - aead->authsize;
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rctx->assoclen = areq->assoclen;
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rctx->srclen = areq->cryptlen + areq->assoclen;
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rctx->dstlen = rctx->srclen - aead->authsize;
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rctx->iv = &areq->iv[GCM_AES_SALT_SIZE];
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rctx->ivsize = GCM_AES_IV_SIZE - GCM_AES_SALT_SIZE;
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rctx->flags = areq->base.flags;
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rctx->ctx_handle = nctx->u.ctx_handle;
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rctx->src = areq->src;
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rctx->dst = areq->dst;
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rctx->ctrl_arg = DECRYPT;
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ret = nitrox_set_creq(rctx);
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if (ret)
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return ret;
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/* send the crypto request */
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return nitrox_process_se_request(nctx->ndev, creq, nitrox_aead_callback,
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areq);
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}
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static int nitrox_aead_init(struct crypto_aead *aead)
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{
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struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
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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->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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nctx->u.fctx->flags.f = 0;
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return 0;
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}
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static int nitrox_gcm_common_init(struct crypto_aead *aead)
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{
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int ret;
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struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
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union fc_ctx_flags *flags;
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ret = nitrox_aead_init(aead);
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if (ret)
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return ret;
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flags = &nctx->u.fctx->flags;
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flags->w0.cipher_type = CIPHER_AES_GCM;
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flags->w0.hash_type = AUTH_NULL;
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flags->w0.iv_source = IV_FROM_DPTR;
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/* ask microcode to calculate ipad/opad */
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flags->w0.auth_input_type = 1;
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flags->f = cpu_to_be64(flags->fu);
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return 0;
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}
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static int nitrox_aes_gcm_init(struct crypto_aead *aead)
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{
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int ret;
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ret = nitrox_gcm_common_init(aead);
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if (ret)
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return ret;
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crypto_aead_set_reqsize(aead,
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sizeof(struct aead_request) +
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sizeof(struct nitrox_aead_rctx));
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return 0;
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}
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static void nitrox_aead_exit(struct crypto_aead *aead)
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{
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struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
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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 int nitrox_rfc4106_setkey(struct crypto_aead *aead, const u8 *key,
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unsigned int keylen)
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{
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struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
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struct flexi_crypto_context *fctx = nctx->u.fctx;
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int ret;
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||
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|
|
||
|
|
if (keylen < GCM_AES_SALT_SIZE)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
keylen -= GCM_AES_SALT_SIZE;
|
||
|
|
ret = nitrox_aes_gcm_setkey(aead, key, keylen);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
memcpy(fctx->crypto.iv, key + keylen, GCM_AES_SALT_SIZE);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int nitrox_rfc4106_setauthsize(struct crypto_aead *aead,
|
||
|
|
unsigned int authsize)
|
||
|
|
{
|
||
|
|
switch (authsize) {
|
||
|
|
case 8:
|
||
|
|
case 12:
|
||
|
|
case 16:
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
return nitrox_aead_setauthsize(aead, authsize);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int nitrox_rfc4106_set_aead_rctx_sglist(struct aead_request *areq)
|
||
|
|
{
|
||
|
|
struct nitrox_rfc4106_rctx *rctx = aead_request_ctx_dma(areq);
|
||
|
|
struct nitrox_aead_rctx *aead_rctx = &rctx->base;
|
||
|
|
unsigned int assoclen = areq->assoclen - GCM_RFC4106_IV_SIZE;
|
||
|
|
struct scatterlist *sg;
|
||
|
|
|
||
|
|
if (areq->assoclen != 16 && areq->assoclen != 20)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
scatterwalk_map_and_copy(rctx->assoc, areq->src, 0, assoclen, 0);
|
||
|
|
sg_init_table(rctx->src, 3);
|
||
|
|
sg_set_buf(rctx->src, rctx->assoc, assoclen);
|
||
|
|
sg = scatterwalk_ffwd(rctx->src + 1, areq->src, areq->assoclen);
|
||
|
|
if (sg != rctx->src + 1)
|
||
|
|
sg_chain(rctx->src, 2, sg);
|
||
|
|
|
||
|
|
if (areq->src != areq->dst) {
|
||
|
|
sg_init_table(rctx->dst, 3);
|
||
|
|
sg_set_buf(rctx->dst, rctx->assoc, assoclen);
|
||
|
|
sg = scatterwalk_ffwd(rctx->dst + 1, areq->dst, areq->assoclen);
|
||
|
|
if (sg != rctx->dst + 1)
|
||
|
|
sg_chain(rctx->dst, 2, sg);
|
||
|
|
}
|
||
|
|
|
||
|
|
aead_rctx->src = rctx->src;
|
||
|
|
aead_rctx->dst = (areq->src == areq->dst) ? rctx->src : rctx->dst;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void nitrox_rfc4106_callback(void *arg, int err)
|
||
|
|
{
|
||
|
|
struct aead_request *areq = arg;
|
||
|
|
struct nitrox_rfc4106_rctx *rctx = aead_request_ctx_dma(areq);
|
||
|
|
struct nitrox_kcrypt_request *nkreq = &rctx->base.nkreq;
|
||
|
|
|
||
|
|
free_src_sglist(nkreq);
|
||
|
|
free_dst_sglist(nkreq);
|
||
|
|
if (err) {
|
||
|
|
pr_err_ratelimited("request failed status 0x%0x\n", err);
|
||
|
|
err = -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
aead_request_complete(areq, err);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int nitrox_rfc4106_enc(struct aead_request *areq)
|
||
|
|
{
|
||
|
|
struct crypto_aead *aead = crypto_aead_reqtfm(areq);
|
||
|
|
struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
|
||
|
|
struct nitrox_rfc4106_rctx *rctx = aead_request_ctx_dma(areq);
|
||
|
|
struct nitrox_aead_rctx *aead_rctx = &rctx->base;
|
||
|
|
struct se_crypto_request *creq = &aead_rctx->nkreq.creq;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
aead_rctx->cryptlen = areq->cryptlen;
|
||
|
|
aead_rctx->assoclen = areq->assoclen - GCM_RFC4106_IV_SIZE;
|
||
|
|
aead_rctx->srclen = aead_rctx->assoclen + aead_rctx->cryptlen;
|
||
|
|
aead_rctx->dstlen = aead_rctx->srclen + aead->authsize;
|
||
|
|
aead_rctx->iv = areq->iv;
|
||
|
|
aead_rctx->ivsize = GCM_RFC4106_IV_SIZE;
|
||
|
|
aead_rctx->flags = areq->base.flags;
|
||
|
|
aead_rctx->ctx_handle = nctx->u.ctx_handle;
|
||
|
|
aead_rctx->ctrl_arg = ENCRYPT;
|
||
|
|
|
||
|
|
ret = nitrox_rfc4106_set_aead_rctx_sglist(areq);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
ret = nitrox_set_creq(aead_rctx);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
/* send the crypto request */
|
||
|
|
return nitrox_process_se_request(nctx->ndev, creq,
|
||
|
|
nitrox_rfc4106_callback, areq);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int nitrox_rfc4106_dec(struct aead_request *areq)
|
||
|
|
{
|
||
|
|
struct crypto_aead *aead = crypto_aead_reqtfm(areq);
|
||
|
|
struct nitrox_crypto_ctx *nctx = crypto_aead_ctx_dma(aead);
|
||
|
|
struct nitrox_rfc4106_rctx *rctx = aead_request_ctx(areq);
|
||
|
|
struct nitrox_aead_rctx *aead_rctx = &rctx->base;
|
||
|
|
struct se_crypto_request *creq = &aead_rctx->nkreq.creq;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
aead_rctx->cryptlen = areq->cryptlen - aead->authsize;
|
||
|
|
aead_rctx->assoclen = areq->assoclen - GCM_RFC4106_IV_SIZE;
|
||
|
|
aead_rctx->srclen =
|
||
|
|
areq->cryptlen - GCM_RFC4106_IV_SIZE + areq->assoclen;
|
||
|
|
aead_rctx->dstlen = aead_rctx->srclen - aead->authsize;
|
||
|
|
aead_rctx->iv = areq->iv;
|
||
|
|
aead_rctx->ivsize = GCM_RFC4106_IV_SIZE;
|
||
|
|
aead_rctx->flags = areq->base.flags;
|
||
|
|
aead_rctx->ctx_handle = nctx->u.ctx_handle;
|
||
|
|
aead_rctx->ctrl_arg = DECRYPT;
|
||
|
|
|
||
|
|
ret = nitrox_rfc4106_set_aead_rctx_sglist(areq);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
ret = nitrox_set_creq(aead_rctx);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
/* send the crypto request */
|
||
|
|
return nitrox_process_se_request(nctx->ndev, creq,
|
||
|
|
nitrox_rfc4106_callback, areq);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int nitrox_rfc4106_init(struct crypto_aead *aead)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ret = nitrox_gcm_common_init(aead);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
crypto_aead_set_reqsize_dma(aead, sizeof(struct aead_request) +
|
||
|
|
sizeof(struct nitrox_rfc4106_rctx));
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct aead_alg nitrox_aeads[] = { {
|
||
|
|
.base = {
|
||
|
|
.cra_name = "gcm(aes)",
|
||
|
|
.cra_driver_name = "n5_aes_gcm",
|
||
|
|
.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,
|
||
|
|
},
|
||
|
|
.setkey = nitrox_aes_gcm_setkey,
|
||
|
|
.setauthsize = nitrox_aes_gcm_setauthsize,
|
||
|
|
.encrypt = nitrox_aes_gcm_enc,
|
||
|
|
.decrypt = nitrox_aes_gcm_dec,
|
||
|
|
.init = nitrox_aes_gcm_init,
|
||
|
|
.exit = nitrox_aead_exit,
|
||
|
|
.ivsize = GCM_AES_IV_SIZE,
|
||
|
|
.maxauthsize = AES_BLOCK_SIZE,
|
||
|
|
}, {
|
||
|
|
.base = {
|
||
|
|
.cra_name = "rfc4106(gcm(aes))",
|
||
|
|
.cra_driver_name = "n5_rfc4106",
|
||
|
|
.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,
|
||
|
|
},
|
||
|
|
.setkey = nitrox_rfc4106_setkey,
|
||
|
|
.setauthsize = nitrox_rfc4106_setauthsize,
|
||
|
|
.encrypt = nitrox_rfc4106_enc,
|
||
|
|
.decrypt = nitrox_rfc4106_dec,
|
||
|
|
.init = nitrox_rfc4106_init,
|
||
|
|
.exit = nitrox_aead_exit,
|
||
|
|
.ivsize = GCM_RFC4106_IV_SIZE,
|
||
|
|
.maxauthsize = AES_BLOCK_SIZE,
|
||
|
|
} };
|
||
|
|
|
||
|
|
int nitrox_register_aeads(void)
|
||
|
|
{
|
||
|
|
return crypto_register_aeads(nitrox_aeads, ARRAY_SIZE(nitrox_aeads));
|
||
|
|
}
|
||
|
|
|
||
|
|
void nitrox_unregister_aeads(void)
|
||
|
|
{
|
||
|
|
crypto_unregister_aeads(nitrox_aeads, ARRAY_SIZE(nitrox_aeads));
|
||
|
|
}
|