diff options
Diffstat (limited to 'arch/arm/crypto/ghash-ce-glue.c')
| -rw-r--r-- | arch/arm/crypto/ghash-ce-glue.c | 795 |
1 files changed, 795 insertions, 0 deletions
diff --git a/arch/arm/crypto/ghash-ce-glue.c b/arch/arm/crypto/ghash-ce-glue.c new file mode 100644 index 0000000000..3ddf05b423 --- /dev/null +++ b/arch/arm/crypto/ghash-ce-glue.c @@ -0,0 +1,795 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Accelerated GHASH implementation with ARMv8 vmull.p64 instructions. + * + * Copyright (C) 2015 - 2018 Linaro Ltd. + * Copyright (C) 2023 Google LLC. + */ + +#include <asm/hwcap.h> +#include <asm/neon.h> +#include <asm/simd.h> +#include <asm/unaligned.h> +#include <crypto/aes.h> +#include <crypto/gcm.h> +#include <crypto/b128ops.h> +#include <crypto/cryptd.h> +#include <crypto/internal/aead.h> +#include <crypto/internal/hash.h> +#include <crypto/internal/simd.h> +#include <crypto/internal/skcipher.h> +#include <crypto/gf128mul.h> +#include <crypto/scatterwalk.h> +#include <linux/cpufeature.h> +#include <linux/crypto.h> +#include <linux/jump_label.h> +#include <linux/module.h> + +MODULE_DESCRIPTION("GHASH hash function using ARMv8 Crypto Extensions"); +MODULE_AUTHOR("Ard Biesheuvel <ardb@kernel.org>"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS_CRYPTO("ghash"); +MODULE_ALIAS_CRYPTO("gcm(aes)"); +MODULE_ALIAS_CRYPTO("rfc4106(gcm(aes))"); + +#define GHASH_BLOCK_SIZE 16 +#define GHASH_DIGEST_SIZE 16 + +#define RFC4106_NONCE_SIZE 4 + +struct ghash_key { + be128 k; + u64 h[][2]; +}; + +struct gcm_key { + u64 h[4][2]; + u32 rk[AES_MAX_KEYLENGTH_U32]; + int rounds; + u8 nonce[]; // for RFC4106 nonce +}; + +struct ghash_desc_ctx { + u64 digest[GHASH_DIGEST_SIZE/sizeof(u64)]; + u8 buf[GHASH_BLOCK_SIZE]; + u32 count; +}; + +struct ghash_async_ctx { + struct cryptd_ahash *cryptd_tfm; +}; + +asmlinkage void pmull_ghash_update_p64(int blocks, u64 dg[], const char *src, + u64 const h[][2], const char *head); + +asmlinkage void pmull_ghash_update_p8(int blocks, u64 dg[], const char *src, + u64 const h[][2], const char *head); + +static __ro_after_init DEFINE_STATIC_KEY_FALSE(use_p64); + +static int ghash_init(struct shash_desc *desc) +{ + struct ghash_desc_ctx *ctx = shash_desc_ctx(desc); + + *ctx = (struct ghash_desc_ctx){}; + return 0; +} + +static void ghash_do_update(int blocks, u64 dg[], const char *src, + struct ghash_key *key, const char *head) +{ + if (likely(crypto_simd_usable())) { + kernel_neon_begin(); + if (static_branch_likely(&use_p64)) + pmull_ghash_update_p64(blocks, dg, src, key->h, head); + else + pmull_ghash_update_p8(blocks, dg, src, key->h, head); + kernel_neon_end(); + } else { + be128 dst = { cpu_to_be64(dg[1]), cpu_to_be64(dg[0]) }; + + do { + const u8 *in = src; + + if (head) { + in = head; + blocks++; + head = NULL; + } else { + src += GHASH_BLOCK_SIZE; + } + + crypto_xor((u8 *)&dst, in, GHASH_BLOCK_SIZE); + gf128mul_lle(&dst, &key->k); + } while (--blocks); + + dg[0] = be64_to_cpu(dst.b); + dg[1] = be64_to_cpu(dst.a); + } +} + +static int ghash_update(struct shash_desc *desc, const u8 *src, + unsigned int len) +{ + struct ghash_desc_ctx *ctx = shash_desc_ctx(desc); + unsigned int partial = ctx->count % GHASH_BLOCK_SIZE; + + ctx->count += len; + + if ((partial + len) >= GHASH_BLOCK_SIZE) { + struct ghash_key *key = crypto_shash_ctx(desc->tfm); + int blocks; + + if (partial) { + int p = GHASH_BLOCK_SIZE - partial; + + memcpy(ctx->buf + partial, src, p); + src += p; + len -= p; + } + + blocks = len / GHASH_BLOCK_SIZE; + len %= GHASH_BLOCK_SIZE; + + ghash_do_update(blocks, ctx->digest, src, key, + partial ? ctx->buf : NULL); + src += blocks * GHASH_BLOCK_SIZE; + partial = 0; + } + if (len) + memcpy(ctx->buf + partial, src, len); + return 0; +} + +static int ghash_final(struct shash_desc *desc, u8 *dst) +{ + struct ghash_desc_ctx *ctx = shash_desc_ctx(desc); + unsigned int partial = ctx->count % GHASH_BLOCK_SIZE; + + if (partial) { + struct ghash_key *key = crypto_shash_ctx(desc->tfm); + + memset(ctx->buf + partial, 0, GHASH_BLOCK_SIZE - partial); + ghash_do_update(1, ctx->digest, ctx->buf, key, NULL); + } + put_unaligned_be64(ctx->digest[1], dst); + put_unaligned_be64(ctx->digest[0], dst + 8); + + *ctx = (struct ghash_desc_ctx){}; + return 0; +} + +static void ghash_reflect(u64 h[], const be128 *k) +{ + u64 carry = be64_to_cpu(k->a) >> 63; + + h[0] = (be64_to_cpu(k->b) << 1) | carry; + h[1] = (be64_to_cpu(k->a) << 1) | (be64_to_cpu(k->b) >> 63); + + if (carry) + h[1] ^= 0xc200000000000000UL; +} + +static int ghash_setkey(struct crypto_shash *tfm, + const u8 *inkey, unsigned int keylen) +{ + struct ghash_key *key = crypto_shash_ctx(tfm); + + if (keylen != GHASH_BLOCK_SIZE) + return -EINVAL; + + /* needed for the fallback */ + memcpy(&key->k, inkey, GHASH_BLOCK_SIZE); + ghash_reflect(key->h[0], &key->k); + + if (static_branch_likely(&use_p64)) { + be128 h = key->k; + + gf128mul_lle(&h, &key->k); + ghash_reflect(key->h[1], &h); + + gf128mul_lle(&h, &key->k); + ghash_reflect(key->h[2], &h); + + gf128mul_lle(&h, &key->k); + ghash_reflect(key->h[3], &h); + } + return 0; +} + +static struct shash_alg ghash_alg = { + .digestsize = GHASH_DIGEST_SIZE, + .init = ghash_init, + .update = ghash_update, + .final = ghash_final, + .setkey = ghash_setkey, + .descsize = sizeof(struct ghash_desc_ctx), + + .base.cra_name = "ghash", + .base.cra_driver_name = "ghash-ce-sync", + .base.cra_priority = 300 - 1, + .base.cra_blocksize = GHASH_BLOCK_SIZE, + .base.cra_ctxsize = sizeof(struct ghash_key) + sizeof(u64[2]), + .base.cra_module = THIS_MODULE, +}; + +static int ghash_async_init(struct ahash_request *req) +{ + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm); + struct ahash_request *cryptd_req = ahash_request_ctx(req); + struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm; + struct shash_desc *desc = cryptd_shash_desc(cryptd_req); + struct crypto_shash *child = cryptd_ahash_child(cryptd_tfm); + + desc->tfm = child; + return crypto_shash_init(desc); +} + +static int ghash_async_update(struct ahash_request *req) +{ + struct ahash_request *cryptd_req = ahash_request_ctx(req); + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm); + struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm; + + if (!crypto_simd_usable() || + (in_atomic() && cryptd_ahash_queued(cryptd_tfm))) { + memcpy(cryptd_req, req, sizeof(*req)); + ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base); + return crypto_ahash_update(cryptd_req); + } else { + struct shash_desc *desc = cryptd_shash_desc(cryptd_req); + return shash_ahash_update(req, desc); + } +} + +static int ghash_async_final(struct ahash_request *req) +{ + struct ahash_request *cryptd_req = ahash_request_ctx(req); + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm); + struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm; + + if (!crypto_simd_usable() || + (in_atomic() && cryptd_ahash_queued(cryptd_tfm))) { + memcpy(cryptd_req, req, sizeof(*req)); + ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base); + return crypto_ahash_final(cryptd_req); + } else { + struct shash_desc *desc = cryptd_shash_desc(cryptd_req); + return crypto_shash_final(desc, req->result); + } +} + +static int ghash_async_digest(struct ahash_request *req) +{ + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm); + struct ahash_request *cryptd_req = ahash_request_ctx(req); + struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm; + + if (!crypto_simd_usable() || + (in_atomic() && cryptd_ahash_queued(cryptd_tfm))) { + memcpy(cryptd_req, req, sizeof(*req)); + ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base); + return crypto_ahash_digest(cryptd_req); + } else { + struct shash_desc *desc = cryptd_shash_desc(cryptd_req); + struct crypto_shash *child = cryptd_ahash_child(cryptd_tfm); + + desc->tfm = child; + return shash_ahash_digest(req, desc); + } +} + +static int ghash_async_import(struct ahash_request *req, const void *in) +{ + struct ahash_request *cryptd_req = ahash_request_ctx(req); + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm); + struct shash_desc *desc = cryptd_shash_desc(cryptd_req); + + desc->tfm = cryptd_ahash_child(ctx->cryptd_tfm); + + return crypto_shash_import(desc, in); +} + +static int ghash_async_export(struct ahash_request *req, void *out) +{ + struct ahash_request *cryptd_req = ahash_request_ctx(req); + struct shash_desc *desc = cryptd_shash_desc(cryptd_req); + + return crypto_shash_export(desc, out); +} + +static int ghash_async_setkey(struct crypto_ahash *tfm, const u8 *key, + unsigned int keylen) +{ + struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm); + struct crypto_ahash *child = &ctx->cryptd_tfm->base; + + crypto_ahash_clear_flags(child, CRYPTO_TFM_REQ_MASK); + crypto_ahash_set_flags(child, crypto_ahash_get_flags(tfm) + & CRYPTO_TFM_REQ_MASK); + return crypto_ahash_setkey(child, key, keylen); +} + +static int ghash_async_init_tfm(struct crypto_tfm *tfm) +{ + struct cryptd_ahash *cryptd_tfm; + struct ghash_async_ctx *ctx = crypto_tfm_ctx(tfm); + + cryptd_tfm = cryptd_alloc_ahash("ghash-ce-sync", 0, 0); + if (IS_ERR(cryptd_tfm)) + return PTR_ERR(cryptd_tfm); + ctx->cryptd_tfm = cryptd_tfm; + crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm), + sizeof(struct ahash_request) + + crypto_ahash_reqsize(&cryptd_tfm->base)); + + return 0; +} + +static void ghash_async_exit_tfm(struct crypto_tfm *tfm) +{ + struct ghash_async_ctx *ctx = crypto_tfm_ctx(tfm); + + cryptd_free_ahash(ctx->cryptd_tfm); +} + +static struct ahash_alg ghash_async_alg = { + .init = ghash_async_init, + .update = ghash_async_update, + .final = ghash_async_final, + .setkey = ghash_async_setkey, + .digest = ghash_async_digest, + .import = ghash_async_import, + .export = ghash_async_export, + .halg.digestsize = GHASH_DIGEST_SIZE, + .halg.statesize = sizeof(struct ghash_desc_ctx), + .halg.base = { + .cra_name = "ghash", + .cra_driver_name = "ghash-ce", + .cra_priority = 300, + .cra_flags = CRYPTO_ALG_ASYNC, + .cra_blocksize = GHASH_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct ghash_async_ctx), + .cra_module = THIS_MODULE, + .cra_init = ghash_async_init_tfm, + .cra_exit = ghash_async_exit_tfm, + }, +}; + + +void pmull_gcm_encrypt(int blocks, u64 dg[], const char *src, + struct gcm_key const *k, char *dst, + const char *iv, int rounds, u32 counter); + +void pmull_gcm_enc_final(int blocks, u64 dg[], char *tag, + struct gcm_key const *k, char *head, + const char *iv, int rounds, u32 counter); + +void pmull_gcm_decrypt(int bytes, u64 dg[], const char *src, + struct gcm_key const *k, char *dst, + const char *iv, int rounds, u32 counter); + +int pmull_gcm_dec_final(int bytes, u64 dg[], char *tag, + struct gcm_key const *k, char *head, + const char *iv, int rounds, u32 counter, + const char *otag, int authsize); + +static int gcm_aes_setkey(struct crypto_aead *tfm, const u8 *inkey, + unsigned int keylen) +{ + struct gcm_key *ctx = crypto_aead_ctx(tfm); + struct crypto_aes_ctx aes_ctx; + be128 h, k; + int ret; + + ret = aes_expandkey(&aes_ctx, inkey, keylen); + if (ret) + return -EINVAL; + + aes_encrypt(&aes_ctx, (u8 *)&k, (u8[AES_BLOCK_SIZE]){}); + + memcpy(ctx->rk, aes_ctx.key_enc, sizeof(ctx->rk)); + ctx->rounds = 6 + keylen / 4; + + memzero_explicit(&aes_ctx, sizeof(aes_ctx)); + + ghash_reflect(ctx->h[0], &k); + + h = k; + gf128mul_lle(&h, &k); + ghash_reflect(ctx->h[1], &h); + + gf128mul_lle(&h, &k); + ghash_reflect(ctx->h[2], &h); + + gf128mul_lle(&h, &k); + ghash_reflect(ctx->h[3], &h); + + return 0; +} + +static int gcm_aes_setauthsize(struct crypto_aead *tfm, unsigned int authsize) +{ + return crypto_gcm_check_authsize(authsize); +} + +static void gcm_update_mac(u64 dg[], const u8 *src, int count, u8 buf[], + int *buf_count, struct gcm_key *ctx) +{ + if (*buf_count > 0) { + int buf_added = min(count, GHASH_BLOCK_SIZE - *buf_count); + + memcpy(&buf[*buf_count], src, buf_added); + + *buf_count += buf_added; + src += buf_added; + count -= buf_added; + } + + if (count >= GHASH_BLOCK_SIZE || *buf_count == GHASH_BLOCK_SIZE) { + int blocks = count / GHASH_BLOCK_SIZE; + + pmull_ghash_update_p64(blocks, dg, src, ctx->h, + *buf_count ? buf : NULL); + + src += blocks * GHASH_BLOCK_SIZE; + count %= GHASH_BLOCK_SIZE; + *buf_count = 0; + } + + if (count > 0) { + memcpy(buf, src, count); + *buf_count = count; + } +} + +static void gcm_calculate_auth_mac(struct aead_request *req, u64 dg[], u32 len) +{ + struct crypto_aead *aead = crypto_aead_reqtfm(req); + struct gcm_key *ctx = crypto_aead_ctx(aead); + u8 buf[GHASH_BLOCK_SIZE]; + struct scatter_walk walk; + int buf_count = 0; + + scatterwalk_start(&walk, req->src); + + do { + u32 n = scatterwalk_clamp(&walk, len); + u8 *p; + + if (!n) { + scatterwalk_start(&walk, sg_next(walk.sg)); + n = scatterwalk_clamp(&walk, len); + } + + p = scatterwalk_map(&walk); + gcm_update_mac(dg, p, n, buf, &buf_count, ctx); + scatterwalk_unmap(p); + + if (unlikely(len / SZ_4K > (len - n) / SZ_4K)) { + kernel_neon_end(); + kernel_neon_begin(); + } + + len -= n; + scatterwalk_advance(&walk, n); + scatterwalk_done(&walk, 0, len); + } while (len); + + if (buf_count) { + memset(&buf[buf_count], 0, GHASH_BLOCK_SIZE - buf_count); + pmull_ghash_update_p64(1, dg, buf, ctx->h, NULL); + } +} + +static int gcm_encrypt(struct aead_request *req, const u8 *iv, u32 assoclen) +{ + struct crypto_aead *aead = crypto_aead_reqtfm(req); + struct gcm_key *ctx = crypto_aead_ctx(aead); + struct skcipher_walk walk; + u8 buf[AES_BLOCK_SIZE]; + u32 counter = 2; + u64 dg[2] = {}; + be128 lengths; + const u8 *src; + u8 *tag, *dst; + int tail, err; + + if (WARN_ON_ONCE(!may_use_simd())) + return -EBUSY; + + err = skcipher_walk_aead_encrypt(&walk, req, false); + + kernel_neon_begin(); + + if (assoclen) + gcm_calculate_auth_mac(req, dg, assoclen); + + src = walk.src.virt.addr; + dst = walk.dst.virt.addr; + + while (walk.nbytes >= AES_BLOCK_SIZE) { + int nblocks = walk.nbytes / AES_BLOCK_SIZE; + + pmull_gcm_encrypt(nblocks, dg, src, ctx, dst, iv, + ctx->rounds, counter); + counter += nblocks; + + if (walk.nbytes == walk.total) { + src += nblocks * AES_BLOCK_SIZE; + dst += nblocks * AES_BLOCK_SIZE; + break; + } + + kernel_neon_end(); + + err = skcipher_walk_done(&walk, + walk.nbytes % AES_BLOCK_SIZE); + if (err) + return err; + + src = walk.src.virt.addr; + dst = walk.dst.virt.addr; + + kernel_neon_begin(); + } + + + lengths.a = cpu_to_be64(assoclen * 8); + lengths.b = cpu_to_be64(req->cryptlen * 8); + + tag = (u8 *)&lengths; + tail = walk.nbytes % AES_BLOCK_SIZE; + + /* + * Bounce via a buffer unless we are encrypting in place and src/dst + * are not pointing to the start of the walk buffer. In that case, we + * can do a NEON load/xor/store sequence in place as long as we move + * the plain/ciphertext and keystream to the start of the register. If + * not, do a memcpy() to the end of the buffer so we can reuse the same + * logic. + */ + if (unlikely(tail && (tail == walk.nbytes || src != dst))) + src = memcpy(buf + sizeof(buf) - tail, src, tail); + + pmull_gcm_enc_final(tail, dg, tag, ctx, (u8 *)src, iv, + ctx->rounds, counter); + kernel_neon_end(); + + if (unlikely(tail && src != dst)) + memcpy(dst, src, tail); + + if (walk.nbytes) { + err = skcipher_walk_done(&walk, 0); + if (err) + return err; + } + + /* copy authtag to end of dst */ + scatterwalk_map_and_copy(tag, req->dst, req->assoclen + req->cryptlen, + crypto_aead_authsize(aead), 1); + + return 0; +} + +static int gcm_decrypt(struct aead_request *req, const u8 *iv, u32 assoclen) +{ + struct crypto_aead *aead = crypto_aead_reqtfm(req); + struct gcm_key *ctx = crypto_aead_ctx(aead); + int authsize = crypto_aead_authsize(aead); + struct skcipher_walk walk; + u8 otag[AES_BLOCK_SIZE]; + u8 buf[AES_BLOCK_SIZE]; + u32 counter = 2; + u64 dg[2] = {}; + be128 lengths; + const u8 *src; + u8 *tag, *dst; + int tail, err, ret; + + if (WARN_ON_ONCE(!may_use_simd())) + return -EBUSY; + + scatterwalk_map_and_copy(otag, req->src, + req->assoclen + req->cryptlen - authsize, + authsize, 0); + + err = skcipher_walk_aead_decrypt(&walk, req, false); + + kernel_neon_begin(); + + if (assoclen) + gcm_calculate_auth_mac(req, dg, assoclen); + + src = walk.src.virt.addr; + dst = walk.dst.virt.addr; + + while (walk.nbytes >= AES_BLOCK_SIZE) { + int nblocks = walk.nbytes / AES_BLOCK_SIZE; + + pmull_gcm_decrypt(nblocks, dg, src, ctx, dst, iv, + ctx->rounds, counter); + counter += nblocks; + + if (walk.nbytes == walk.total) { + src += nblocks * AES_BLOCK_SIZE; + dst += nblocks * AES_BLOCK_SIZE; + break; + } + + kernel_neon_end(); + + err = skcipher_walk_done(&walk, + walk.nbytes % AES_BLOCK_SIZE); + if (err) + return err; + + src = walk.src.virt.addr; + dst = walk.dst.virt.addr; + + kernel_neon_begin(); + } + + lengths.a = cpu_to_be64(assoclen * 8); + lengths.b = cpu_to_be64((req->cryptlen - authsize) * 8); + + tag = (u8 *)&lengths; + tail = walk.nbytes % AES_BLOCK_SIZE; + + if (unlikely(tail && (tail == walk.nbytes || src != dst))) + src = memcpy(buf + sizeof(buf) - tail, src, tail); + + ret = pmull_gcm_dec_final(tail, dg, tag, ctx, (u8 *)src, iv, + ctx->rounds, counter, otag, authsize); + kernel_neon_end(); + + if (unlikely(tail && src != dst)) + memcpy(dst, src, tail); + + if (walk.nbytes) { + err = skcipher_walk_done(&walk, 0); + if (err) + return err; + } + + return ret ? -EBADMSG : 0; +} + +static int gcm_aes_encrypt(struct aead_request *req) +{ + return gcm_encrypt(req, req->iv, req->assoclen); +} + +static int gcm_aes_decrypt(struct aead_request *req) +{ + return gcm_decrypt(req, req->iv, req->assoclen); +} + +static int rfc4106_setkey(struct crypto_aead *tfm, const u8 *inkey, + unsigned int keylen) +{ + struct gcm_key *ctx = crypto_aead_ctx(tfm); + int err; + + keylen -= RFC4106_NONCE_SIZE; + err = gcm_aes_setkey(tfm, inkey, keylen); + if (err) + return err; + + memcpy(ctx->nonce, inkey + keylen, RFC4106_NONCE_SIZE); + return 0; +} + +static int rfc4106_setauthsize(struct crypto_aead *tfm, unsigned int authsize) +{ + return crypto_rfc4106_check_authsize(authsize); +} + +static int rfc4106_encrypt(struct aead_request *req) +{ + struct crypto_aead *aead = crypto_aead_reqtfm(req); + struct gcm_key *ctx = crypto_aead_ctx(aead); + u8 iv[GCM_AES_IV_SIZE]; + + memcpy(iv, ctx->nonce, RFC4106_NONCE_SIZE); + memcpy(iv + RFC4106_NONCE_SIZE, req->iv, GCM_RFC4106_IV_SIZE); + + return crypto_ipsec_check_assoclen(req->assoclen) ?: + gcm_encrypt(req, iv, req->assoclen - GCM_RFC4106_IV_SIZE); +} + +static int rfc4106_decrypt(struct aead_request *req) +{ + struct crypto_aead *aead = crypto_aead_reqtfm(req); + struct gcm_key *ctx = crypto_aead_ctx(aead); + u8 iv[GCM_AES_IV_SIZE]; + + memcpy(iv, ctx->nonce, RFC4106_NONCE_SIZE); + memcpy(iv + RFC4106_NONCE_SIZE, req->iv, GCM_RFC4106_IV_SIZE); + + return crypto_ipsec_check_assoclen(req->assoclen) ?: + gcm_decrypt(req, iv, req->assoclen - GCM_RFC4106_IV_SIZE); +} + +static struct aead_alg gcm_aes_algs[] = {{ + .ivsize = GCM_AES_IV_SIZE, + .chunksize = AES_BLOCK_SIZE, + .maxauthsize = AES_BLOCK_SIZE, + .setkey = gcm_aes_setkey, + .setauthsize = gcm_aes_setauthsize, + .encrypt = gcm_aes_encrypt, + .decrypt = gcm_aes_decrypt, + + .base.cra_name = "gcm(aes)", + .base.cra_driver_name = "gcm-aes-ce", + .base.cra_priority = 400, + .base.cra_blocksize = 1, + .base.cra_ctxsize = sizeof(struct gcm_key), + .base.cra_module = THIS_MODULE, +}, { + .ivsize = GCM_RFC4106_IV_SIZE, + .chunksize = AES_BLOCK_SIZE, + .maxauthsize = AES_BLOCK_SIZE, + .setkey = rfc4106_setkey, + .setauthsize = rfc4106_setauthsize, + .encrypt = rfc4106_encrypt, + .decrypt = rfc4106_decrypt, + + .base.cra_name = "rfc4106(gcm(aes))", + .base.cra_driver_name = "rfc4106-gcm-aes-ce", + .base.cra_priority = 400, + .base.cra_blocksize = 1, + .base.cra_ctxsize = sizeof(struct gcm_key) + RFC4106_NONCE_SIZE, + .base.cra_module = THIS_MODULE, +}}; + +static int __init ghash_ce_mod_init(void) +{ + int err; + + if (!(elf_hwcap & HWCAP_NEON)) + return -ENODEV; + + if (elf_hwcap2 & HWCAP2_PMULL) { + err = crypto_register_aeads(gcm_aes_algs, + ARRAY_SIZE(gcm_aes_algs)); + if (err) + return err; + ghash_alg.base.cra_ctxsize += 3 * sizeof(u64[2]); + static_branch_enable(&use_p64); + } + + err = crypto_register_shash(&ghash_alg); + if (err) + goto err_aead; + err = crypto_register_ahash(&ghash_async_alg); + if (err) + goto err_shash; + + return 0; + +err_shash: + crypto_unregister_shash(&ghash_alg); +err_aead: + if (elf_hwcap2 & HWCAP2_PMULL) + crypto_unregister_aeads(gcm_aes_algs, + ARRAY_SIZE(gcm_aes_algs)); + return err; +} + +static void __exit ghash_ce_mod_exit(void) +{ + crypto_unregister_ahash(&ghash_async_alg); + crypto_unregister_shash(&ghash_alg); + if (elf_hwcap2 & HWCAP2_PMULL) + crypto_unregister_aeads(gcm_aes_algs, + ARRAY_SIZE(gcm_aes_algs)); +} + +module_init(ghash_ce_mod_init); +module_exit(ghash_ce_mod_exit); |