diff options
Diffstat (limited to 'drivers/crypto/marvell/cipher.c')
| -rw-r--r-- | drivers/crypto/marvell/cipher.c | 331 |
1 files changed, 331 insertions, 0 deletions
diff --git a/drivers/crypto/marvell/cipher.c b/drivers/crypto/marvell/cipher.c new file mode 100644 index 000000000000..e6eea488f11e --- /dev/null +++ b/drivers/crypto/marvell/cipher.c @@ -0,0 +1,331 @@ +/* + * Cipher algorithms supported by the CESA: DES, 3DES and AES. + * + * Author: Boris Brezillon <boris.brezillon@free-electrons.com> + * Author: Arnaud Ebalard <arno@natisbad.org> + * + * This work is based on an initial version written by + * Sebastian Andrzej Siewior < sebastian at breakpoint dot cc > + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + */ + +#include <crypto/aes.h> + +#include "cesa.h" + +struct mv_cesa_aes_ctx { + struct mv_cesa_ctx base; + struct crypto_aes_ctx aes; +}; + +static void mv_cesa_ablkcipher_std_step(struct ablkcipher_request *req) +{ + struct mv_cesa_ablkcipher_req *creq = ablkcipher_request_ctx(req); + struct mv_cesa_ablkcipher_std_req *sreq = &creq->req.std; + struct mv_cesa_engine *engine = sreq->base.engine; + size_t len = min_t(size_t, req->nbytes - sreq->offset, + CESA_SA_SRAM_PAYLOAD_SIZE); + + len = sg_pcopy_to_buffer(req->src, creq->src_nents, + engine->sram + CESA_SA_DATA_SRAM_OFFSET, + len, sreq->offset); + + sreq->size = len; + mv_cesa_set_crypt_op_len(&sreq->op, len); + + /* FIXME: only update enc_len field */ + if (!sreq->skip_ctx) { + memcpy(engine->sram, &sreq->op, sizeof(sreq->op)); + sreq->skip_ctx = true; + } else { + memcpy(engine->sram, &sreq->op, sizeof(sreq->op.desc)); + } + + mv_cesa_set_int_mask(engine, CESA_SA_INT_ACCEL0_DONE); + writel(CESA_SA_CFG_PARA_DIS, engine->regs + CESA_SA_CFG); + writel(CESA_SA_CMD_EN_CESA_SA_ACCL0, engine->regs + CESA_SA_CMD); +} + +static int mv_cesa_ablkcipher_std_process(struct ablkcipher_request *req, + u32 status) +{ + struct mv_cesa_ablkcipher_req *creq = ablkcipher_request_ctx(req); + struct mv_cesa_ablkcipher_std_req *sreq = &creq->req.std; + struct mv_cesa_engine *engine = sreq->base.engine; + size_t len; + + len = sg_pcopy_from_buffer(req->dst, creq->dst_nents, + engine->sram + CESA_SA_DATA_SRAM_OFFSET, + sreq->size, sreq->offset); + + sreq->offset += len; + if (sreq->offset < req->nbytes) + return -EINPROGRESS; + + return 0; +} + +static int mv_cesa_ablkcipher_process(struct crypto_async_request *req, + u32 status) +{ + struct ablkcipher_request *ablkreq = ablkcipher_request_cast(req); + struct mv_cesa_ablkcipher_req *creq = ablkcipher_request_ctx(ablkreq); + struct mv_cesa_ablkcipher_std_req *sreq = &creq->req.std; + struct mv_cesa_engine *engine = sreq->base.engine; + int ret; + + ret = mv_cesa_ablkcipher_std_process(ablkreq, status); + if (ret) + return ret; + + memcpy(ablkreq->info, engine->sram + CESA_SA_CRYPT_IV_SRAM_OFFSET, + crypto_ablkcipher_ivsize(crypto_ablkcipher_reqtfm(ablkreq))); + + return 0; +} + +static void mv_cesa_ablkcipher_step(struct crypto_async_request *req) +{ + struct ablkcipher_request *ablkreq = ablkcipher_request_cast(req); + + mv_cesa_ablkcipher_std_step(ablkreq); +} + +static inline void +mv_cesa_ablkcipher_std_prepare(struct ablkcipher_request *req) +{ + struct mv_cesa_ablkcipher_req *creq = ablkcipher_request_ctx(req); + struct mv_cesa_ablkcipher_std_req *sreq = &creq->req.std; + struct mv_cesa_engine *engine = sreq->base.engine; + + sreq->size = 0; + sreq->offset = 0; + mv_cesa_adjust_op(engine, &sreq->op); + memcpy(engine->sram, &sreq->op, sizeof(sreq->op)); +} + +static inline void mv_cesa_ablkcipher_prepare(struct crypto_async_request *req, + struct mv_cesa_engine *engine) +{ + struct ablkcipher_request *ablkreq = ablkcipher_request_cast(req); + struct mv_cesa_ablkcipher_req *creq = ablkcipher_request_ctx(ablkreq); + + creq->req.base.engine = engine; + + mv_cesa_ablkcipher_std_prepare(ablkreq); +} + +static inline void +mv_cesa_ablkcipher_req_cleanup(struct crypto_async_request *req) +{ +} + +static const struct mv_cesa_req_ops mv_cesa_ablkcipher_req_ops = { + .step = mv_cesa_ablkcipher_step, + .process = mv_cesa_ablkcipher_process, + .prepare = mv_cesa_ablkcipher_prepare, + .cleanup = mv_cesa_ablkcipher_req_cleanup, +}; + +static int mv_cesa_ablkcipher_cra_init(struct crypto_tfm *tfm) +{ + struct mv_cesa_aes_ctx *ctx = crypto_tfm_ctx(tfm); + + ctx->base.ops = &mv_cesa_ablkcipher_req_ops; + + tfm->crt_ablkcipher.reqsize = sizeof(struct mv_cesa_ablkcipher_req); + + return 0; +} + +static int mv_cesa_aes_setkey(struct crypto_ablkcipher *cipher, const u8 *key, + unsigned int len) +{ + struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher); + struct mv_cesa_aes_ctx *ctx = crypto_tfm_ctx(tfm); + int remaining; + int offset; + int ret; + int i; + + ret = crypto_aes_expand_key(&ctx->aes, key, len); + if (ret) { + crypto_ablkcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN); + return ret; + } + + remaining = (ctx->aes.key_length - 16) / 4; + offset = ctx->aes.key_length + 24 - remaining; + for (i = 0; i < remaining; i++) + ctx->aes.key_dec[4 + i] = + cpu_to_le32(ctx->aes.key_enc[offset + i]); + + return 0; +} + +static inline int +mv_cesa_ablkcipher_std_req_init(struct ablkcipher_request *req, + const struct mv_cesa_op_ctx *op_templ) +{ + struct mv_cesa_ablkcipher_req *creq = ablkcipher_request_ctx(req); + struct mv_cesa_ablkcipher_std_req *sreq = &creq->req.std; + + sreq->base.type = CESA_STD_REQ; + sreq->op = *op_templ; + sreq->skip_ctx = false; + + return 0; +} + +static int mv_cesa_ablkcipher_req_init(struct ablkcipher_request *req, + struct mv_cesa_op_ctx *tmpl) +{ + struct mv_cesa_ablkcipher_req *creq = ablkcipher_request_ctx(req); + struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req); + unsigned int blksize = crypto_ablkcipher_blocksize(tfm); + + if (!IS_ALIGNED(req->nbytes, blksize)) + return -EINVAL; + + creq->src_nents = sg_nents_for_len(req->src, req->nbytes); + creq->dst_nents = sg_nents_for_len(req->dst, req->nbytes); + + mv_cesa_update_op_cfg(tmpl, CESA_SA_DESC_CFG_OP_CRYPT_ONLY, + CESA_SA_DESC_CFG_OP_MSK); + + return mv_cesa_ablkcipher_std_req_init(req, tmpl); +} + +static int mv_cesa_aes_op(struct ablkcipher_request *req, + struct mv_cesa_op_ctx *tmpl) +{ + struct mv_cesa_aes_ctx *ctx = crypto_tfm_ctx(req->base.tfm); + int ret, i; + u32 *key; + u32 cfg; + + cfg = CESA_SA_DESC_CFG_CRYPTM_AES; + + if (mv_cesa_get_op_cfg(tmpl) & CESA_SA_DESC_CFG_DIR_DEC) + key = ctx->aes.key_dec; + else + key = ctx->aes.key_enc; + + for (i = 0; i < ctx->aes.key_length / sizeof(u32); i++) + tmpl->ctx.blkcipher.key[i] = cpu_to_le32(key[i]); + + if (ctx->aes.key_length == 24) + cfg |= CESA_SA_DESC_CFG_AES_LEN_192; + else if (ctx->aes.key_length == 32) + cfg |= CESA_SA_DESC_CFG_AES_LEN_256; + + mv_cesa_update_op_cfg(tmpl, cfg, + CESA_SA_DESC_CFG_CRYPTM_MSK | + CESA_SA_DESC_CFG_AES_LEN_MSK); + + ret = mv_cesa_ablkcipher_req_init(req, tmpl); + if (ret) + return ret; + + return mv_cesa_queue_req(&req->base); +} + +static int mv_cesa_ecb_aes_encrypt(struct ablkcipher_request *req) +{ + struct mv_cesa_op_ctx tmpl; + + mv_cesa_set_op_cfg(&tmpl, + CESA_SA_DESC_CFG_CRYPTCM_ECB | + CESA_SA_DESC_CFG_DIR_ENC); + + return mv_cesa_aes_op(req, &tmpl); +} + +static int mv_cesa_ecb_aes_decrypt(struct ablkcipher_request *req) +{ + struct mv_cesa_op_ctx tmpl; + + mv_cesa_set_op_cfg(&tmpl, + CESA_SA_DESC_CFG_CRYPTCM_ECB | + CESA_SA_DESC_CFG_DIR_DEC); + + return mv_cesa_aes_op(req, &tmpl); +} + +struct crypto_alg mv_cesa_ecb_aes_alg = { + .cra_name = "ecb(aes)", + .cra_driver_name = "mv-ecb-aes", + .cra_priority = 300, + .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | + CRYPTO_ALG_KERN_DRIVER_ONLY | CRYPTO_ALG_ASYNC, + .cra_blocksize = AES_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct mv_cesa_aes_ctx), + .cra_alignmask = 0, + .cra_type = &crypto_ablkcipher_type, + .cra_module = THIS_MODULE, + .cra_init = mv_cesa_ablkcipher_cra_init, + .cra_u = { + .ablkcipher = { + .min_keysize = AES_MIN_KEY_SIZE, + .max_keysize = AES_MAX_KEY_SIZE, + .setkey = mv_cesa_aes_setkey, + .encrypt = mv_cesa_ecb_aes_encrypt, + .decrypt = mv_cesa_ecb_aes_decrypt, + }, + }, +}; + +static int mv_cesa_cbc_aes_op(struct ablkcipher_request *req, + struct mv_cesa_op_ctx *tmpl) +{ + mv_cesa_update_op_cfg(tmpl, CESA_SA_DESC_CFG_CRYPTCM_CBC, + CESA_SA_DESC_CFG_CRYPTCM_MSK); + memcpy(tmpl->ctx.blkcipher.iv, req->info, AES_BLOCK_SIZE); + + return mv_cesa_aes_op(req, tmpl); +} + +static int mv_cesa_cbc_aes_encrypt(struct ablkcipher_request *req) +{ + struct mv_cesa_op_ctx tmpl; + + mv_cesa_set_op_cfg(&tmpl, CESA_SA_DESC_CFG_DIR_ENC); + + return mv_cesa_cbc_aes_op(req, &tmpl); +} + +static int mv_cesa_cbc_aes_decrypt(struct ablkcipher_request *req) +{ + struct mv_cesa_op_ctx tmpl; + + mv_cesa_set_op_cfg(&tmpl, CESA_SA_DESC_CFG_DIR_DEC); + + return mv_cesa_cbc_aes_op(req, &tmpl); +} + +struct crypto_alg mv_cesa_cbc_aes_alg = { + .cra_name = "cbc(aes)", + .cra_driver_name = "mv-cbc-aes", + .cra_priority = 300, + .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | + CRYPTO_ALG_KERN_DRIVER_ONLY | CRYPTO_ALG_ASYNC, + .cra_blocksize = AES_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct mv_cesa_aes_ctx), + .cra_alignmask = 0, + .cra_type = &crypto_ablkcipher_type, + .cra_module = THIS_MODULE, + .cra_init = mv_cesa_ablkcipher_cra_init, + .cra_u = { + .ablkcipher = { + .min_keysize = AES_MIN_KEY_SIZE, + .max_keysize = AES_MAX_KEY_SIZE, + .ivsize = AES_BLOCK_SIZE, + .setkey = mv_cesa_aes_setkey, + .encrypt = mv_cesa_cbc_aes_encrypt, + .decrypt = mv_cesa_cbc_aes_decrypt, + }, + }, +}; |