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path: root/drivers/crypto/ccp/ccp-crypto-des3.c
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Diffstat (limited to 'drivers/crypto/ccp/ccp-crypto-des3.c')
-rw-r--r--drivers/crypto/ccp/ccp-crypto-des3.c254
1 files changed, 254 insertions, 0 deletions
diff --git a/drivers/crypto/ccp/ccp-crypto-des3.c b/drivers/crypto/ccp/ccp-crypto-des3.c
new file mode 100644
index 000000000000..5af7347ae03c
--- /dev/null
+++ b/drivers/crypto/ccp/ccp-crypto-des3.c
@@ -0,0 +1,254 @@
+/*
+ * AMD Cryptographic Coprocessor (CCP) DES3 crypto API support
+ *
+ * Copyright (C) 2016 Advanced Micro Devices, Inc.
+ *
+ * Author: Gary R Hook <ghook@amd.com>
+ *
+ * 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 <linux/module.h>
+#include <linux/sched.h>
+#include <linux/delay.h>
+#include <linux/scatterlist.h>
+#include <linux/crypto.h>
+#include <crypto/algapi.h>
+#include <crypto/scatterwalk.h>
+#include <crypto/des.h>
+
+#include "ccp-crypto.h"
+
+static int ccp_des3_complete(struct crypto_async_request *async_req, int ret)
+{
+ struct ablkcipher_request *req = ablkcipher_request_cast(async_req);
+ struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
+ struct ccp_des3_req_ctx *rctx = ablkcipher_request_ctx(req);
+
+ if (ret)
+ return ret;
+
+ if (ctx->u.des3.mode != CCP_DES3_MODE_ECB)
+ memcpy(req->info, rctx->iv, DES3_EDE_BLOCK_SIZE);
+
+ return 0;
+}
+
+static int ccp_des3_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
+ unsigned int key_len)
+{
+ struct ccp_ctx *ctx = crypto_tfm_ctx(crypto_ablkcipher_tfm(tfm));
+ struct ccp_crypto_ablkcipher_alg *alg =
+ ccp_crypto_ablkcipher_alg(crypto_ablkcipher_tfm(tfm));
+ u32 *flags = &tfm->base.crt_flags;
+
+
+ /* From des_generic.c:
+ *
+ * RFC2451:
+ * If the first two or last two independent 64-bit keys are
+ * equal (k1 == k2 or k2 == k3), then the DES3 operation is simply the
+ * same as DES. Implementers MUST reject keys that exhibit this
+ * property.
+ */
+ const u32 *K = (const u32 *)key;
+
+ if (unlikely(!((K[0] ^ K[2]) | (K[1] ^ K[3])) ||
+ !((K[2] ^ K[4]) | (K[3] ^ K[5]))) &&
+ (*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
+ *flags |= CRYPTO_TFM_RES_WEAK_KEY;
+ return -EINVAL;
+ }
+
+ /* It's not clear that there is any support for a keysize of 112.
+ * If needed, the caller should make K1 == K3
+ */
+ ctx->u.des3.type = CCP_DES3_TYPE_168;
+ ctx->u.des3.mode = alg->mode;
+ ctx->u.des3.key_len = key_len;
+
+ memcpy(ctx->u.des3.key, key, key_len);
+ sg_init_one(&ctx->u.des3.key_sg, ctx->u.des3.key, key_len);
+
+ return 0;
+}
+
+static int ccp_des3_crypt(struct ablkcipher_request *req, bool encrypt)
+{
+ struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
+ struct ccp_des3_req_ctx *rctx = ablkcipher_request_ctx(req);
+ struct scatterlist *iv_sg = NULL;
+ unsigned int iv_len = 0;
+ int ret;
+
+ if (!ctx->u.des3.key_len)
+ return -EINVAL;
+
+ if (((ctx->u.des3.mode == CCP_DES3_MODE_ECB) ||
+ (ctx->u.des3.mode == CCP_DES3_MODE_CBC)) &&
+ (req->nbytes & (DES3_EDE_BLOCK_SIZE - 1)))
+ return -EINVAL;
+
+ if (ctx->u.des3.mode != CCP_DES3_MODE_ECB) {
+ if (!req->info)
+ return -EINVAL;
+
+ memcpy(rctx->iv, req->info, DES3_EDE_BLOCK_SIZE);
+ iv_sg = &rctx->iv_sg;
+ iv_len = DES3_EDE_BLOCK_SIZE;
+ sg_init_one(iv_sg, rctx->iv, iv_len);
+ }
+
+ memset(&rctx->cmd, 0, sizeof(rctx->cmd));
+ INIT_LIST_HEAD(&rctx->cmd.entry);
+ rctx->cmd.engine = CCP_ENGINE_DES3;
+ rctx->cmd.u.des3.type = ctx->u.des3.type;
+ rctx->cmd.u.des3.mode = ctx->u.des3.mode;
+ rctx->cmd.u.des3.action = (encrypt)
+ ? CCP_DES3_ACTION_ENCRYPT
+ : CCP_DES3_ACTION_DECRYPT;
+ rctx->cmd.u.des3.key = &ctx->u.des3.key_sg;
+ rctx->cmd.u.des3.key_len = ctx->u.des3.key_len;
+ rctx->cmd.u.des3.iv = iv_sg;
+ rctx->cmd.u.des3.iv_len = iv_len;
+ rctx->cmd.u.des3.src = req->src;
+ rctx->cmd.u.des3.src_len = req->nbytes;
+ rctx->cmd.u.des3.dst = req->dst;
+
+ ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd);
+
+ return ret;
+}
+
+static int ccp_des3_encrypt(struct ablkcipher_request *req)
+{
+ return ccp_des3_crypt(req, true);
+}
+
+static int ccp_des3_decrypt(struct ablkcipher_request *req)
+{
+ return ccp_des3_crypt(req, false);
+}
+
+static int ccp_des3_cra_init(struct crypto_tfm *tfm)
+{
+ struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ ctx->complete = ccp_des3_complete;
+ ctx->u.des3.key_len = 0;
+
+ tfm->crt_ablkcipher.reqsize = sizeof(struct ccp_des3_req_ctx);
+
+ return 0;
+}
+
+static void ccp_des3_cra_exit(struct crypto_tfm *tfm)
+{
+}
+
+static struct crypto_alg ccp_des3_defaults = {
+ .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
+ CRYPTO_ALG_ASYNC |
+ CRYPTO_ALG_KERN_DRIVER_ONLY |
+ CRYPTO_ALG_NEED_FALLBACK,
+ .cra_blocksize = DES3_EDE_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct ccp_ctx),
+ .cra_priority = CCP_CRA_PRIORITY,
+ .cra_type = &crypto_ablkcipher_type,
+ .cra_init = ccp_des3_cra_init,
+ .cra_exit = ccp_des3_cra_exit,
+ .cra_module = THIS_MODULE,
+ .cra_ablkcipher = {
+ .setkey = ccp_des3_setkey,
+ .encrypt = ccp_des3_encrypt,
+ .decrypt = ccp_des3_decrypt,
+ .min_keysize = DES3_EDE_KEY_SIZE,
+ .max_keysize = DES3_EDE_KEY_SIZE,
+ },
+};
+
+struct ccp_des3_def {
+ enum ccp_des3_mode mode;
+ unsigned int version;
+ const char *name;
+ const char *driver_name;
+ unsigned int blocksize;
+ unsigned int ivsize;
+ struct crypto_alg *alg_defaults;
+};
+
+static struct ccp_des3_def des3_algs[] = {
+ {
+ .mode = CCP_DES3_MODE_ECB,
+ .version = CCP_VERSION(5, 0),
+ .name = "ecb(des3_ede)",
+ .driver_name = "ecb-des3-ccp",
+ .blocksize = DES3_EDE_BLOCK_SIZE,
+ .ivsize = 0,
+ .alg_defaults = &ccp_des3_defaults,
+ },
+ {
+ .mode = CCP_DES3_MODE_CBC,
+ .version = CCP_VERSION(5, 0),
+ .name = "cbc(des3_ede)",
+ .driver_name = "cbc-des3-ccp",
+ .blocksize = DES3_EDE_BLOCK_SIZE,
+ .ivsize = DES3_EDE_BLOCK_SIZE,
+ .alg_defaults = &ccp_des3_defaults,
+ },
+};
+
+static int ccp_register_des3_alg(struct list_head *head,
+ const struct ccp_des3_def *def)
+{
+ struct ccp_crypto_ablkcipher_alg *ccp_alg;
+ struct crypto_alg *alg;
+ int ret;
+
+ ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL);
+ if (!ccp_alg)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&ccp_alg->entry);
+
+ ccp_alg->mode = def->mode;
+
+ /* Copy the defaults and override as necessary */
+ alg = &ccp_alg->alg;
+ *alg = *def->alg_defaults;
+ snprintf(alg->cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
+ snprintf(alg->cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
+ def->driver_name);
+ alg->cra_blocksize = def->blocksize;
+ alg->cra_ablkcipher.ivsize = def->ivsize;
+
+ ret = crypto_register_alg(alg);
+ if (ret) {
+ pr_err("%s ablkcipher algorithm registration error (%d)\n",
+ alg->cra_name, ret);
+ kfree(ccp_alg);
+ return ret;
+ }
+
+ list_add(&ccp_alg->entry, head);
+
+ return 0;
+}
+
+int ccp_register_des3_algs(struct list_head *head)
+{
+ int i, ret;
+ unsigned int ccpversion = ccp_version();
+
+ for (i = 0; i < ARRAY_SIZE(des3_algs); i++) {
+ if (des3_algs[i].version > ccpversion)
+ continue;
+ ret = ccp_register_des3_alg(head, &des3_algs[i]);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
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