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Diffstat (limited to 'arch/arm/crypto/ghash-ce-glue.c')
-rw-r--r--arch/arm/crypto/ghash-ce-glue.c485
1 files changed, 445 insertions, 40 deletions
diff --git a/arch/arm/crypto/ghash-ce-glue.c b/arch/arm/crypto/ghash-ce-glue.c
index c691077679a6..3ddf05b4234d 100644
--- a/arch/arm/crypto/ghash-ce-glue.c
+++ b/arch/arm/crypto/ghash-ce-glue.c
@@ -2,37 +2,51 @@
/*
* Accelerated GHASH implementation with ARMv8 vmull.p64 instructions.
*
- * Copyright (C) 2015 - 2018 Linaro Ltd. <ard.biesheuvel@linaro.org>
+ * 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 <ard.biesheuvel@linaro.org>");
-MODULE_LICENSE("GPL v2");
+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
-struct ghash_key {
- u64 h[2];
- u64 h2[2];
- u64 h3[2];
- u64 h4[2];
+#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 {
@@ -46,16 +60,12 @@ struct ghash_async_ctx {
};
asmlinkage void pmull_ghash_update_p64(int blocks, u64 dg[], const char *src,
- struct ghash_key const *k,
- const char *head);
+ u64 const h[][2], const char *head);
asmlinkage void pmull_ghash_update_p8(int blocks, u64 dg[], const char *src,
- struct ghash_key const *k,
- const char *head);
+ u64 const h[][2], const char *head);
-static void (*pmull_ghash_update)(int blocks, u64 dg[], const char *src,
- struct ghash_key const *k,
- const char *head);
+static __ro_after_init DEFINE_STATIC_KEY_FALSE(use_p64);
static int ghash_init(struct shash_desc *desc)
{
@@ -70,7 +80,10 @@ static void ghash_do_update(int blocks, u64 dg[], const char *src,
{
if (likely(crypto_simd_usable())) {
kernel_neon_begin();
- pmull_ghash_update(blocks, dg, src, key, head);
+ 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]) };
@@ -161,27 +174,26 @@ static int ghash_setkey(struct crypto_shash *tfm,
const u8 *inkey, unsigned int keylen)
{
struct ghash_key *key = crypto_shash_ctx(tfm);
- be128 h;
- if (keylen != GHASH_BLOCK_SIZE) {
- crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
+ if (keylen != GHASH_BLOCK_SIZE)
return -EINVAL;
- }
/* needed for the fallback */
memcpy(&key->k, inkey, GHASH_BLOCK_SIZE);
- ghash_reflect(key->h, &key->k);
+ ghash_reflect(key->h[0], &key->k);
- h = key->k;
- gf128mul_lle(&h, &key->k);
- ghash_reflect(key->h2, &h);
+ if (static_branch_likely(&use_p64)) {
+ be128 h = key->k;
- gf128mul_lle(&h, &key->k);
- ghash_reflect(key->h3, &h);
+ gf128mul_lle(&h, &key->k);
+ ghash_reflect(key->h[1], &h);
- gf128mul_lle(&h, &key->k);
- ghash_reflect(key->h4, &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;
}
@@ -197,7 +209,7 @@ static struct shash_alg ghash_alg = {
.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),
+ .base.cra_ctxsize = sizeof(struct ghash_key) + sizeof(u64[2]),
.base.cra_module = THIS_MODULE,
};
@@ -296,16 +308,11 @@ static int ghash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
{
struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
struct crypto_ahash *child = &ctx->cryptd_tfm->base;
- int err;
crypto_ahash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
crypto_ahash_set_flags(child, crypto_ahash_get_flags(tfm)
& CRYPTO_TFM_REQ_MASK);
- err = crypto_ahash_setkey(child, key, keylen);
- crypto_ahash_set_flags(tfm, crypto_ahash_get_flags(child)
- & CRYPTO_TFM_RES_MASK);
-
- return err;
+ return crypto_ahash_setkey(child, key, keylen);
}
static int ghash_async_init_tfm(struct crypto_tfm *tfm)
@@ -354,6 +361,393 @@ static struct ahash_alg ghash_async_alg = {
},
};
+
+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;
@@ -361,14 +755,18 @@ static int __init ghash_ce_mod_init(void)
if (!(elf_hwcap & HWCAP_NEON))
return -ENODEV;
- if (elf_hwcap2 & HWCAP2_PMULL)
- pmull_ghash_update = pmull_ghash_update_p64;
- else
- pmull_ghash_update = pmull_ghash_update_p8;
+ 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)
- return err;
+ goto err_aead;
err = crypto_register_ahash(&ghash_async_alg);
if (err)
goto err_shash;
@@ -377,6 +775,10 @@ static int __init ghash_ce_mod_init(void)
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;
}
@@ -384,6 +786,9 @@ 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);