mirror of https://github.com/hak5/openwrt.git
221 lines
6.3 KiB
Diff
221 lines
6.3 KiB
Diff
From 59231368d3a959fc30c5142c406a045f49130daa Mon Sep 17 00:00:00 2001
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From: Christian Lamparter <chunkeey@gmail.com>
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Date: Wed, 4 Oct 2017 01:00:17 +0200
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Subject: [PATCH 25/25] crypto: crypto4xx - add aes-gcm support
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This patch adds aes-gcm support to crypto4xx.
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Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
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Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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---
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drivers/crypto/amcc/crypto4xx_alg.c | 139 +++++++++++++++++++++++++++++++++++
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drivers/crypto/amcc/crypto4xx_core.c | 22 ++++++
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drivers/crypto/amcc/crypto4xx_core.h | 4 +
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3 files changed, 165 insertions(+)
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--- a/drivers/crypto/amcc/crypto4xx_alg.c
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+++ b/drivers/crypto/amcc/crypto4xx_alg.c
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@@ -28,6 +28,7 @@
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#include <crypto/algapi.h>
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#include <crypto/aead.h>
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#include <crypto/aes.h>
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+#include <crypto/gcm.h>
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#include <crypto/sha.h>
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#include <crypto/ctr.h>
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#include "crypto4xx_reg_def.h"
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@@ -418,6 +419,144 @@ int crypto4xx_setauthsize_aead(struct cr
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}
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/**
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+ * AES-GCM Functions
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+ */
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+
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+static int crypto4xx_aes_gcm_validate_keylen(unsigned int keylen)
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+{
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+ switch (keylen) {
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+ case 16:
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+ case 24:
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+ case 32:
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+ return 0;
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+ default:
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+ return -EINVAL;
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+ }
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+}
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+
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+static int crypto4xx_compute_gcm_hash_key_sw(__le32 *hash_start, const u8 *key,
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+ unsigned int keylen)
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+{
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+ struct crypto_cipher *aes_tfm = NULL;
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+ uint8_t src[16] = { 0 };
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+ int rc = 0;
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+
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+ aes_tfm = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC |
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+ CRYPTO_ALG_NEED_FALLBACK);
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+ if (IS_ERR(aes_tfm)) {
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+ rc = PTR_ERR(aes_tfm);
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+ pr_warn("could not load aes cipher driver: %d\n", rc);
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+ return rc;
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+ }
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+
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+ rc = crypto_cipher_setkey(aes_tfm, key, keylen);
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+ if (rc) {
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+ pr_err("setkey() failed: %d\n", rc);
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+ goto out;
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+ }
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+
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+ crypto_cipher_encrypt_one(aes_tfm, src, src);
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+ crypto4xx_memcpy_to_le32(hash_start, src, 16);
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+out:
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+ crypto_free_cipher(aes_tfm);
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+ return rc;
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+}
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+
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+int crypto4xx_setkey_aes_gcm(struct crypto_aead *cipher,
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+ const u8 *key, unsigned int keylen)
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+{
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+ struct crypto_tfm *tfm = crypto_aead_tfm(cipher);
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+ struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
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+ struct dynamic_sa_ctl *sa;
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+ int rc = 0;
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+
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+ if (crypto4xx_aes_gcm_validate_keylen(keylen) != 0) {
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+ crypto_aead_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
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+ return -EINVAL;
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+ }
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+
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+ rc = crypto4xx_setup_fallback(ctx, cipher, key, keylen);
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+ if (rc)
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+ return rc;
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+
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+ if (ctx->sa_in || ctx->sa_out)
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+ crypto4xx_free_sa(ctx);
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+
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+ rc = crypto4xx_alloc_sa(ctx, SA_AES128_GCM_LEN + (keylen - 16) / 4);
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+ if (rc)
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+ return rc;
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+
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+ sa = (struct dynamic_sa_ctl *) ctx->sa_in;
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+
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+ sa->sa_contents.w = SA_AES_GCM_CONTENTS | (keylen << 2);
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+ set_dynamic_sa_command_0(sa, SA_SAVE_HASH, SA_NOT_SAVE_IV,
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+ SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE,
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+ SA_NO_HEADER_PROC, SA_HASH_ALG_GHASH,
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+ SA_CIPHER_ALG_AES, SA_PAD_TYPE_ZERO,
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+ SA_OP_GROUP_BASIC, SA_OPCODE_HASH_DECRYPT,
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+ DIR_INBOUND);
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+ set_dynamic_sa_command_1(sa, CRYPTO_MODE_CTR, SA_HASH_MODE_HASH,
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+ CRYPTO_FEEDBACK_MODE_NO_FB, SA_EXTENDED_SN_OFF,
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+ SA_SEQ_MASK_ON, SA_MC_DISABLE,
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+ SA_NOT_COPY_PAD, SA_COPY_PAYLOAD,
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+ SA_NOT_COPY_HDR);
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+
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+ sa->sa_command_1.bf.key_len = keylen >> 3;
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+
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+ crypto4xx_memcpy_to_le32(get_dynamic_sa_key_field(sa),
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+ key, keylen);
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+
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+ rc = crypto4xx_compute_gcm_hash_key_sw(get_dynamic_sa_inner_digest(sa),
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+ key, keylen);
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+ if (rc) {
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+ pr_err("GCM hash key setting failed = %d\n", rc);
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+ goto err;
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+ }
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+
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+ memcpy(ctx->sa_out, ctx->sa_in, ctx->sa_len * 4);
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+ sa = (struct dynamic_sa_ctl *) ctx->sa_out;
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+ sa->sa_command_0.bf.dir = DIR_OUTBOUND;
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+ sa->sa_command_0.bf.opcode = SA_OPCODE_ENCRYPT_HASH;
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+
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+ return 0;
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+err:
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+ crypto4xx_free_sa(ctx);
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+ return rc;
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+}
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+
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+static inline int crypto4xx_crypt_aes_gcm(struct aead_request *req,
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+ bool decrypt)
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+{
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+ struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
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+ unsigned int len = req->cryptlen;
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+ __le32 iv[4];
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+
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+ if (crypto4xx_aead_need_fallback(req, false, decrypt))
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+ return crypto4xx_aead_fallback(req, ctx, decrypt);
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+
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+ crypto4xx_memcpy_to_le32(iv, req->iv, GCM_AES_IV_SIZE);
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+ iv[3] = cpu_to_le32(1);
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+
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+ if (decrypt)
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+ len -= crypto_aead_authsize(crypto_aead_reqtfm(req));
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+
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+ return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
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+ len, iv, sizeof(iv),
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+ decrypt ? ctx->sa_in : ctx->sa_out,
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+ ctx->sa_len, req->assoclen);
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+}
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+
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+int crypto4xx_encrypt_aes_gcm(struct aead_request *req)
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+{
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+ return crypto4xx_crypt_aes_gcm(req, false);
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+}
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+
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+int crypto4xx_decrypt_aes_gcm(struct aead_request *req)
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+{
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+ return crypto4xx_crypt_aes_gcm(req, true);
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+}
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+
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+/**
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* HASH SHA1 Functions
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*/
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static int crypto4xx_hash_alg_init(struct crypto_tfm *tfm,
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--- a/drivers/crypto/amcc/crypto4xx_core.c
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+++ b/drivers/crypto/amcc/crypto4xx_core.c
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@@ -38,6 +38,7 @@
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#include <crypto/aead.h>
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#include <crypto/aes.h>
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#include <crypto/ctr.h>
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+#include <crypto/gcm.h>
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#include <crypto/sha.h>
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#include <crypto/scatterwalk.h>
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#include <crypto/internal/aead.h>
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@@ -1232,6 +1233,27 @@ static struct crypto4xx_alg_common crypt
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.cra_priority = CRYPTO4XX_CRYPTO_PRIORITY,
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.cra_flags = CRYPTO_ALG_ASYNC |
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CRYPTO_ALG_NEED_FALLBACK |
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+ CRYPTO_ALG_KERN_DRIVER_ONLY,
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+ .cra_blocksize = 1,
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+ .cra_ctxsize = sizeof(struct crypto4xx_ctx),
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+ .cra_module = THIS_MODULE,
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+ },
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+ } },
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+ { .type = CRYPTO_ALG_TYPE_AEAD, .u.aead = {
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+ .setkey = crypto4xx_setkey_aes_gcm,
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+ .setauthsize = crypto4xx_setauthsize_aead,
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+ .encrypt = crypto4xx_encrypt_aes_gcm,
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+ .decrypt = crypto4xx_decrypt_aes_gcm,
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+ .init = crypto4xx_aead_init,
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+ .exit = crypto4xx_aead_exit,
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+ .ivsize = GCM_AES_IV_SIZE,
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+ .maxauthsize = 16,
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+ .base = {
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+ .cra_name = "gcm(aes)",
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+ .cra_driver_name = "gcm-aes-ppc4xx",
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+ .cra_priority = CRYPTO4XX_CRYPTO_PRIORITY,
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+ .cra_flags = CRYPTO_ALG_ASYNC |
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+ CRYPTO_ALG_NEED_FALLBACK |
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CRYPTO_ALG_KERN_DRIVER_ONLY,
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.cra_blocksize = 1,
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.cra_ctxsize = sizeof(struct crypto4xx_ctx),
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--- a/drivers/crypto/amcc/crypto4xx_core.h
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+++ b/drivers/crypto/amcc/crypto4xx_core.h
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@@ -229,5 +229,9 @@ int crypto4xx_setkey_aes_ccm(struct cryp
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const u8 *key, unsigned int keylen);
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int crypto4xx_encrypt_aes_ccm(struct aead_request *req);
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int crypto4xx_decrypt_aes_ccm(struct aead_request *req);
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+int crypto4xx_setkey_aes_gcm(struct crypto_aead *cipher,
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+ const u8 *key, unsigned int keylen);
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+int crypto4xx_encrypt_aes_gcm(struct aead_request *req);
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+int crypto4xx_decrypt_aes_gcm(struct aead_request *req);
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#endif
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