st1 {XL.2d}, [x1]
ret
ENDPROC(pmull_ghash_update)
+
+ KS .req v8
+ CTR .req v9
+ INP .req v10
+
+ .macro load_round_keys, rounds, rk
+ cmp \rounds, #12
+ blo 2222f /* 128 bits */
+ beq 1111f /* 192 bits */
+ ld1 {v17.4s-v18.4s}, [\rk], #32
+1111: ld1 {v19.4s-v20.4s}, [\rk], #32
+2222: ld1 {v21.4s-v24.4s}, [\rk], #64
+ ld1 {v25.4s-v28.4s}, [\rk], #64
+ ld1 {v29.4s-v31.4s}, [\rk]
+ .endm
+
+ .macro enc_round, state, key
+ aese \state\().16b, \key\().16b
+ aesmc \state\().16b, \state\().16b
+ .endm
+
+ .macro enc_block, state, rounds
+ cmp \rounds, #12
+ b.lo 2222f /* 128 bits */
+ b.eq 1111f /* 192 bits */
+ enc_round \state, v17
+ enc_round \state, v18
+1111: enc_round \state, v19
+ enc_round \state, v20
+2222: .irp key, v21, v22, v23, v24, v25, v26, v27, v28, v29
+ enc_round \state, \key
+ .endr
+ aese \state\().16b, v30.16b
+ eor \state\().16b, \state\().16b, v31.16b
+ .endm
+
+ .macro pmull_gcm_do_crypt, enc
+ ld1 {SHASH.2d}, [x4]
+ ld1 {XL.2d}, [x1]
+ ldr x8, [x5, #8] // load lower counter
+
+ movi MASK.16b, #0xe1
+ ext SHASH2.16b, SHASH.16b, SHASH.16b, #8
+CPU_LE( rev x8, x8 )
+ shl MASK.2d, MASK.2d, #57
+ eor SHASH2.16b, SHASH2.16b, SHASH.16b
+
+ .if \enc == 1
+ ld1 {KS.16b}, [x7]
+ .endif
+
+0: ld1 {CTR.8b}, [x5] // load upper counter
+ ld1 {INP.16b}, [x3], #16
+ rev x9, x8
+ add x8, x8, #1
+ sub w0, w0, #1
+ ins CTR.d[1], x9 // set lower counter
+
+ .if \enc == 1
+ eor INP.16b, INP.16b, KS.16b // encrypt input
+ st1 {INP.16b}, [x2], #16
+ .endif
+
+ rev64 T1.16b, INP.16b
+
+ cmp w6, #12
+ b.ge 2f // AES-192/256?
+
+1: enc_round CTR, v21
+
+ ext T2.16b, XL.16b, XL.16b, #8
+ ext IN1.16b, T1.16b, T1.16b, #8
+
+ enc_round CTR, v22
+
+ eor T1.16b, T1.16b, T2.16b
+ eor XL.16b, XL.16b, IN1.16b
+
+ enc_round CTR, v23
+
+ pmull2 XH.1q, SHASH.2d, XL.2d // a1 * b1
+ eor T1.16b, T1.16b, XL.16b
+
+ enc_round CTR, v24
+
+ pmull XL.1q, SHASH.1d, XL.1d // a0 * b0
+ pmull XM.1q, SHASH2.1d, T1.1d // (a1 + a0)(b1 + b0)
+
+ enc_round CTR, v25
+
+ ext T1.16b, XL.16b, XH.16b, #8
+ eor T2.16b, XL.16b, XH.16b
+ eor XM.16b, XM.16b, T1.16b
+
+ enc_round CTR, v26
+
+ eor XM.16b, XM.16b, T2.16b
+ pmull T2.1q, XL.1d, MASK.1d
+
+ enc_round CTR, v27
+
+ mov XH.d[0], XM.d[1]
+ mov XM.d[1], XL.d[0]
+
+ enc_round CTR, v28
+
+ eor XL.16b, XM.16b, T2.16b
+
+ enc_round CTR, v29
+
+ ext T2.16b, XL.16b, XL.16b, #8
+
+ aese CTR.16b, v30.16b
+
+ pmull XL.1q, XL.1d, MASK.1d
+ eor T2.16b, T2.16b, XH.16b
+
+ eor KS.16b, CTR.16b, v31.16b
+
+ eor XL.16b, XL.16b, T2.16b
+
+ .if \enc == 0
+ eor INP.16b, INP.16b, KS.16b
+ st1 {INP.16b}, [x2], #16
+ .endif
+
+ cbnz w0, 0b
+
+CPU_LE( rev x8, x8 )
+ st1 {XL.2d}, [x1]
+ str x8, [x5, #8] // store lower counter
+
+ .if \enc == 1
+ st1 {KS.16b}, [x7]
+ .endif
+
+ ret
+
+2: b.eq 3f // AES-192?
+ enc_round CTR, v17
+ enc_round CTR, v18
+3: enc_round CTR, v19
+ enc_round CTR, v20
+ b 1b
+ .endm
+
+ /*
+ * void pmull_gcm_encrypt(int blocks, u64 dg[], u8 dst[], const u8 src[],
+ * struct ghash_key const *k, u8 ctr[],
+ * int rounds, u8 ks[])
+ */
+ENTRY(pmull_gcm_encrypt)
+ pmull_gcm_do_crypt 1
+ENDPROC(pmull_gcm_encrypt)
+
+ /*
+ * void pmull_gcm_decrypt(int blocks, u64 dg[], u8 dst[], const u8 src[],
+ * struct ghash_key const *k, u8 ctr[],
+ * int rounds)
+ */
+ENTRY(pmull_gcm_decrypt)
+ pmull_gcm_do_crypt 0
+ENDPROC(pmull_gcm_decrypt)
+
+ /*
+ * void pmull_gcm_encrypt_block(u8 dst[], u8 src[], u8 rk[], int rounds)
+ */
+ENTRY(pmull_gcm_encrypt_block)
+ cbz x2, 0f
+ load_round_keys w3, x2
+0: ld1 {v0.16b}, [x1]
+ enc_block v0, w3
+ st1 {v0.16b}, [x0]
+ ret
+ENDPROC(pmull_gcm_encrypt_block)
#include <asm/neon.h>
#include <asm/simd.h>
#include <asm/unaligned.h>
+#include <crypto/aes.h>
+#include <crypto/algapi.h>
+#include <crypto/b128ops.h>
#include <crypto/gf128mul.h>
+#include <crypto/internal/aead.h>
#include <crypto/internal/hash.h>
+#include <crypto/internal/skcipher.h>
+#include <crypto/scatterwalk.h>
#include <linux/cpufeature.h>
#include <linux/crypto.h>
#include <linux/module.h>
-MODULE_DESCRIPTION("GHASH secure hash using ARMv8 Crypto Extensions");
+MODULE_DESCRIPTION("GHASH and AES-GCM using ARMv8 Crypto Extensions");
MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
MODULE_LICENSE("GPL v2");
#define GHASH_BLOCK_SIZE 16
#define GHASH_DIGEST_SIZE 16
+#define GCM_IV_SIZE 12
struct ghash_key {
u64 a;
u32 count;
};
+struct gcm_aes_ctx {
+ struct crypto_aes_ctx aes_key;
+ struct ghash_key ghash_key;
+};
+
asmlinkage void pmull_ghash_update(int blocks, u64 dg[], const char *src,
struct ghash_key const *k, const char *head);
+asmlinkage void pmull_gcm_encrypt(int blocks, u64 dg[], u8 dst[],
+ const u8 src[], struct ghash_key const *k,
+ u8 ctr[], int rounds, u8 ks[]);
+
+asmlinkage void pmull_gcm_decrypt(int blocks, u64 dg[], u8 dst[],
+ const u8 src[], struct ghash_key const *k,
+ u8 ctr[], int rounds);
+
+asmlinkage void pmull_gcm_encrypt_block(u8 dst[], u8 const src[],
+ u32 const rk[], int rounds);
+
+asmlinkage void __aes_arm64_encrypt(u32 *rk, u8 *out, const u8 *in, int rounds);
+
static int ghash_init(struct shash_desc *desc)
{
struct ghash_desc_ctx *ctx = shash_desc_ctx(desc);
return 0;
}
-static int ghash_setkey(struct crypto_shash *tfm,
- const u8 *inkey, unsigned int keylen)
+static int __ghash_setkey(struct ghash_key *key,
+ const u8 *inkey, unsigned int keylen)
{
- struct ghash_key *key = crypto_shash_ctx(tfm);
u64 a, b;
- if (keylen != GHASH_BLOCK_SIZE) {
- crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
- return -EINVAL;
- }
-
/* needed for the fallback */
memcpy(&key->k, inkey, GHASH_BLOCK_SIZE);
return 0;
}
+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) {
+ crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
+ return -EINVAL;
+ }
+
+ return __ghash_setkey(key, inkey, keylen);
+}
+
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",
- .cra_driver_name = "ghash-ce",
- .cra_priority = 200,
- .cra_flags = CRYPTO_ALG_TYPE_SHASH,
- .cra_blocksize = GHASH_BLOCK_SIZE,
- .cra_ctxsize = sizeof(struct ghash_key),
- .cra_module = THIS_MODULE,
- },
+ .base.cra_name = "ghash",
+ .base.cra_driver_name = "ghash-ce",
+ .base.cra_priority = 200,
+ .base.cra_flags = CRYPTO_ALG_TYPE_SHASH,
+ .base.cra_blocksize = GHASH_BLOCK_SIZE,
+ .base.cra_ctxsize = sizeof(struct ghash_key),
+ .base.cra_module = THIS_MODULE,
+
+ .digestsize = GHASH_DIGEST_SIZE,
+ .init = ghash_init,
+ .update = ghash_update,
+ .final = ghash_final,
+ .setkey = ghash_setkey,
+ .descsize = sizeof(struct ghash_desc_ctx),
+};
+
+static int num_rounds(struct crypto_aes_ctx *ctx)
+{
+ /*
+ * # of rounds specified by AES:
+ * 128 bit key 10 rounds
+ * 192 bit key 12 rounds
+ * 256 bit key 14 rounds
+ * => n byte key => 6 + (n/4) rounds
+ */
+ return 6 + ctx->key_length / 4;
+}
+
+static int gcm_setkey(struct crypto_aead *tfm, const u8 *inkey,
+ unsigned int keylen)
+{
+ struct gcm_aes_ctx *ctx = crypto_aead_ctx(tfm);
+ u8 key[GHASH_BLOCK_SIZE];
+ int ret;
+
+ ret = crypto_aes_expand_key(&ctx->aes_key, inkey, keylen);
+ if (ret) {
+ tfm->base.crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
+ return -EINVAL;
+ }
+
+ __aes_arm64_encrypt(ctx->aes_key.key_enc, key, (u8[AES_BLOCK_SIZE]){},
+ num_rounds(&ctx->aes_key));
+
+ return __ghash_setkey(&ctx->ghash_key, key, sizeof(key));
+}
+
+static int gcm_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
+{
+ switch (authsize) {
+ case 4:
+ case 8:
+ case 12 ... 16:
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static void gcm_update_mac(u64 dg[], const u8 *src, int count, u8 buf[],
+ int *buf_count, struct gcm_aes_ctx *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;
+
+ ghash_do_update(blocks, dg, src, &ctx->ghash_key,
+ *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[])
+{
+ struct crypto_aead *aead = crypto_aead_reqtfm(req);
+ struct gcm_aes_ctx *ctx = crypto_aead_ctx(aead);
+ u8 buf[GHASH_BLOCK_SIZE];
+ struct scatter_walk walk;
+ u32 len = req->assoclen;
+ 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);
+ len -= n;
+
+ scatterwalk_unmap(p);
+ scatterwalk_advance(&walk, n);
+ scatterwalk_done(&walk, 0, len);
+ } while (len);
+
+ if (buf_count) {
+ memset(&buf[buf_count], 0, GHASH_BLOCK_SIZE - buf_count);
+ ghash_do_update(1, dg, buf, &ctx->ghash_key, NULL);
+ }
+}
+
+static void gcm_final(struct aead_request *req, struct gcm_aes_ctx *ctx,
+ u64 dg[], u8 tag[], int cryptlen)
+{
+ u8 mac[AES_BLOCK_SIZE];
+ u128 lengths;
+
+ lengths.a = cpu_to_be64(req->assoclen * 8);
+ lengths.b = cpu_to_be64(cryptlen * 8);
+
+ ghash_do_update(1, dg, (void *)&lengths, &ctx->ghash_key, NULL);
+
+ put_unaligned_be64(dg[1], mac);
+ put_unaligned_be64(dg[0], mac + 8);
+
+ crypto_xor(tag, mac, AES_BLOCK_SIZE);
+}
+
+static int gcm_encrypt(struct aead_request *req)
+{
+ struct crypto_aead *aead = crypto_aead_reqtfm(req);
+ struct gcm_aes_ctx *ctx = crypto_aead_ctx(aead);
+ struct skcipher_walk walk;
+ u8 iv[AES_BLOCK_SIZE];
+ u8 ks[AES_BLOCK_SIZE];
+ u8 tag[AES_BLOCK_SIZE];
+ u64 dg[2] = {};
+ int err;
+
+ if (req->assoclen)
+ gcm_calculate_auth_mac(req, dg);
+
+ memcpy(iv, req->iv, GCM_IV_SIZE);
+ put_unaligned_be32(1, iv + GCM_IV_SIZE);
+
+ if (likely(may_use_simd())) {
+ kernel_neon_begin();
+
+ pmull_gcm_encrypt_block(tag, iv, ctx->aes_key.key_enc,
+ num_rounds(&ctx->aes_key));
+ put_unaligned_be32(2, iv + GCM_IV_SIZE);
+ pmull_gcm_encrypt_block(ks, iv, NULL,
+ num_rounds(&ctx->aes_key));
+ put_unaligned_be32(3, iv + GCM_IV_SIZE);
+
+ err = skcipher_walk_aead_encrypt(&walk, req, true);
+
+ while (walk.nbytes >= AES_BLOCK_SIZE) {
+ int blocks = walk.nbytes / AES_BLOCK_SIZE;
+
+ pmull_gcm_encrypt(blocks, dg, walk.dst.virt.addr,
+ walk.src.virt.addr, &ctx->ghash_key,
+ iv, num_rounds(&ctx->aes_key), ks);
+
+ err = skcipher_walk_done(&walk,
+ walk.nbytes % AES_BLOCK_SIZE);
+ }
+ kernel_neon_end();
+ } else {
+ __aes_arm64_encrypt(ctx->aes_key.key_enc, tag, iv,
+ num_rounds(&ctx->aes_key));
+ put_unaligned_be32(2, iv + GCM_IV_SIZE);
+
+ err = skcipher_walk_aead_encrypt(&walk, req, true);
+
+ while (walk.nbytes >= AES_BLOCK_SIZE) {
+ int blocks = walk.nbytes / AES_BLOCK_SIZE;
+ u8 *dst = walk.dst.virt.addr;
+ u8 *src = walk.src.virt.addr;
+
+ do {
+ __aes_arm64_encrypt(ctx->aes_key.key_enc,
+ ks, iv,
+ num_rounds(&ctx->aes_key));
+ crypto_xor_cpy(dst, src, ks, AES_BLOCK_SIZE);
+ crypto_inc(iv, AES_BLOCK_SIZE);
+
+ dst += AES_BLOCK_SIZE;
+ src += AES_BLOCK_SIZE;
+ } while (--blocks > 0);
+
+ ghash_do_update(walk.nbytes / AES_BLOCK_SIZE, dg,
+ walk.dst.virt.addr, &ctx->ghash_key,
+ NULL);
+
+ err = skcipher_walk_done(&walk,
+ walk.nbytes % AES_BLOCK_SIZE);
+ }
+ if (walk.nbytes)
+ __aes_arm64_encrypt(ctx->aes_key.key_enc, ks, iv,
+ num_rounds(&ctx->aes_key));
+ }
+
+ /* handle the tail */
+ if (walk.nbytes) {
+ u8 buf[GHASH_BLOCK_SIZE];
+
+ crypto_xor_cpy(walk.dst.virt.addr, walk.src.virt.addr, ks,
+ walk.nbytes);
+
+ memcpy(buf, walk.dst.virt.addr, walk.nbytes);
+ memset(buf + walk.nbytes, 0, GHASH_BLOCK_SIZE - walk.nbytes);
+ ghash_do_update(1, dg, buf, &ctx->ghash_key, NULL);
+
+ err = skcipher_walk_done(&walk, 0);
+ }
+
+ if (err)
+ return err;
+
+ gcm_final(req, ctx, dg, tag, req->cryptlen);
+
+ /* 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)
+{
+ struct crypto_aead *aead = crypto_aead_reqtfm(req);
+ struct gcm_aes_ctx *ctx = crypto_aead_ctx(aead);
+ unsigned int authsize = crypto_aead_authsize(aead);
+ struct skcipher_walk walk;
+ u8 iv[AES_BLOCK_SIZE];
+ u8 tag[AES_BLOCK_SIZE];
+ u8 buf[GHASH_BLOCK_SIZE];
+ u64 dg[2] = {};
+ int err;
+
+ if (req->assoclen)
+ gcm_calculate_auth_mac(req, dg);
+
+ memcpy(iv, req->iv, GCM_IV_SIZE);
+ put_unaligned_be32(1, iv + GCM_IV_SIZE);
+
+ if (likely(may_use_simd())) {
+ kernel_neon_begin();
+
+ pmull_gcm_encrypt_block(tag, iv, ctx->aes_key.key_enc,
+ num_rounds(&ctx->aes_key));
+ put_unaligned_be32(2, iv + GCM_IV_SIZE);
+
+ err = skcipher_walk_aead_decrypt(&walk, req, true);
+
+ while (walk.nbytes >= AES_BLOCK_SIZE) {
+ int blocks = walk.nbytes / AES_BLOCK_SIZE;
+
+ pmull_gcm_decrypt(blocks, dg, walk.dst.virt.addr,
+ walk.src.virt.addr, &ctx->ghash_key,
+ iv, num_rounds(&ctx->aes_key));
+
+ err = skcipher_walk_done(&walk,
+ walk.nbytes % AES_BLOCK_SIZE);
+ }
+ if (walk.nbytes)
+ pmull_gcm_encrypt_block(iv, iv, NULL,
+ num_rounds(&ctx->aes_key));
+
+ kernel_neon_end();
+ } else {
+ __aes_arm64_encrypt(ctx->aes_key.key_enc, tag, iv,
+ num_rounds(&ctx->aes_key));
+ put_unaligned_be32(2, iv + GCM_IV_SIZE);
+
+ err = skcipher_walk_aead_decrypt(&walk, req, true);
+
+ while (walk.nbytes >= AES_BLOCK_SIZE) {
+ int blocks = walk.nbytes / AES_BLOCK_SIZE;
+ u8 *dst = walk.dst.virt.addr;
+ u8 *src = walk.src.virt.addr;
+
+ ghash_do_update(blocks, dg, walk.src.virt.addr,
+ &ctx->ghash_key, NULL);
+
+ do {
+ __aes_arm64_encrypt(ctx->aes_key.key_enc,
+ buf, iv,
+ num_rounds(&ctx->aes_key));
+ crypto_xor_cpy(dst, src, buf, AES_BLOCK_SIZE);
+ crypto_inc(iv, AES_BLOCK_SIZE);
+
+ dst += AES_BLOCK_SIZE;
+ src += AES_BLOCK_SIZE;
+ } while (--blocks > 0);
+
+ err = skcipher_walk_done(&walk,
+ walk.nbytes % AES_BLOCK_SIZE);
+ }
+ if (walk.nbytes)
+ __aes_arm64_encrypt(ctx->aes_key.key_enc, iv, iv,
+ num_rounds(&ctx->aes_key));
+ }
+
+ /* handle the tail */
+ if (walk.nbytes) {
+ memcpy(buf, walk.src.virt.addr, walk.nbytes);
+ memset(buf + walk.nbytes, 0, GHASH_BLOCK_SIZE - walk.nbytes);
+ ghash_do_update(1, dg, buf, &ctx->ghash_key, NULL);
+
+ crypto_xor_cpy(walk.dst.virt.addr, walk.src.virt.addr, iv,
+ walk.nbytes);
+
+ err = skcipher_walk_done(&walk, 0);
+ }
+
+ if (err)
+ return err;
+
+ gcm_final(req, ctx, dg, tag, req->cryptlen - authsize);
+
+ /* compare calculated auth tag with the stored one */
+ scatterwalk_map_and_copy(buf, req->src,
+ req->assoclen + req->cryptlen - authsize,
+ authsize, 0);
+
+ if (crypto_memneq(tag, buf, authsize))
+ return -EBADMSG;
+ return 0;
+}
+
+static struct aead_alg gcm_aes_alg = {
+ .ivsize = GCM_IV_SIZE,
+ .chunksize = AES_BLOCK_SIZE,
+ .maxauthsize = AES_BLOCK_SIZE,
+ .setkey = gcm_setkey,
+ .setauthsize = gcm_setauthsize,
+ .encrypt = gcm_encrypt,
+ .decrypt = gcm_decrypt,
+
+ .base.cra_name = "gcm(aes)",
+ .base.cra_driver_name = "gcm-aes-ce",
+ .base.cra_priority = 300,
+ .base.cra_blocksize = 1,
+ .base.cra_ctxsize = sizeof(struct gcm_aes_ctx),
+ .base.cra_module = THIS_MODULE,
};
static int __init ghash_ce_mod_init(void)
{
- return crypto_register_shash(&ghash_alg);
+ int ret;
+
+ ret = crypto_register_aead(&gcm_aes_alg);
+ if (ret)
+ return ret;
+
+ ret = crypto_register_shash(&ghash_alg);
+ if (ret)
+ crypto_unregister_aead(&gcm_aes_alg);
+ return ret;
}
static void __exit ghash_ce_mod_exit(void)
{
crypto_unregister_shash(&ghash_alg);
+ crypto_unregister_aead(&gcm_aes_alg);
}
module_cpu_feature_match(PMULL, ghash_ce_mod_init);
projects / users / hch / xfs.git / commitdiff