/* * Support for Intel AES-NI instructions. This file contains glue * code, the real AES implementation is in intel-aes_asm.S. * * Copyright (C) 2008, Intel Corp. * Author: Huang Ying * * Added RFC4106 AES-GCM support for 128-bit keys under the AEAD * interface for 64-bit kernels. * Authors: Adrian Hoban * Gabriele Paoloni * Tadeusz Struk (tadeusz.struk@intel.com) * Aidan O'Mahony (aidan.o.mahony@intel.com) * Copyright (c) 2010, Intel Corporation. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef CONFIG_X86_64 #include #endif #define AESNI_ALIGN 16 #define AESNI_ALIGN_ATTR __attribute__ ((__aligned__(AESNI_ALIGN))) #define AES_BLOCK_MASK (~(AES_BLOCK_SIZE - 1)) #define RFC4106_HASH_SUBKEY_SIZE 16 #define AESNI_ALIGN_EXTRA ((AESNI_ALIGN - 1) & ~(CRYPTO_MINALIGN - 1)) #define CRYPTO_AES_CTX_SIZE (sizeof(struct crypto_aes_ctx) + AESNI_ALIGN_EXTRA) #define XTS_AES_CTX_SIZE (sizeof(struct aesni_xts_ctx) + AESNI_ALIGN_EXTRA) /* This data is stored at the end of the crypto_tfm struct. * It's a type of per "session" data storage location. * This needs to be 16 byte aligned. */ struct aesni_rfc4106_gcm_ctx { u8 hash_subkey[16] AESNI_ALIGN_ATTR; struct crypto_aes_ctx aes_key_expanded AESNI_ALIGN_ATTR; u8 nonce[4]; }; struct aesni_xts_ctx { u8 raw_tweak_ctx[sizeof(struct crypto_aes_ctx)] AESNI_ALIGN_ATTR; u8 raw_crypt_ctx[sizeof(struct crypto_aes_ctx)] AESNI_ALIGN_ATTR; }; asmlinkage int aesni_set_key(struct crypto_aes_ctx *ctx, const u8 *in_key, unsigned int key_len); asmlinkage void aesni_enc(struct crypto_aes_ctx *ctx, u8 *out, const u8 *in); asmlinkage void aesni_dec(struct crypto_aes_ctx *ctx, u8 *out, const u8 *in); asmlinkage void aesni_ecb_enc(struct crypto_aes_ctx *ctx, u8 *out, const u8 *in, unsigned int len); asmlinkage void aesni_ecb_dec(struct crypto_aes_ctx *ctx, u8 *out, const u8 *in, unsigned int len); asmlinkage void aesni_cbc_enc(struct crypto_aes_ctx *ctx, u8 *out, const u8 *in, unsigned int len, u8 *iv); asmlinkage void aesni_cbc_dec(struct crypto_aes_ctx *ctx, u8 *out, const u8 *in, unsigned int len, u8 *iv); int crypto_fpu_init(void); void crypto_fpu_exit(void); #define AVX_GEN2_OPTSIZE 640 #define AVX_GEN4_OPTSIZE 4096 #ifdef CONFIG_X86_64 static void (*aesni_ctr_enc_tfm)(struct crypto_aes_ctx *ctx, u8 *out, const u8 *in, unsigned int len, u8 *iv); asmlinkage void aesni_ctr_enc(struct crypto_aes_ctx *ctx, u8 *out, const u8 *in, unsigned int len, u8 *iv); asmlinkage void aesni_xts_crypt8(struct crypto_aes_ctx *ctx, u8 *out, const u8 *in, bool enc, u8 *iv); /* asmlinkage void aesni_gcm_enc() * void *ctx, AES Key schedule. Starts on a 16 byte boundary. * u8 *out, Ciphertext output. Encrypt in-place is allowed. * const u8 *in, Plaintext input * unsigned long plaintext_len, Length of data in bytes for encryption. * u8 *iv, Pre-counter block j0: 4 byte salt (from Security Association) * concatenated with 8 byte Initialisation Vector (from IPSec ESP * Payload) concatenated with 0x00000001. 16-byte aligned pointer. * u8 *hash_subkey, the Hash sub key input. Data starts on a 16-byte boundary. * const u8 *aad, Additional Authentication Data (AAD) * unsigned long aad_len, Length of AAD in bytes. With RFC4106 this * is going to be 8 or 12 bytes * u8 *auth_tag, Authenticated Tag output. * unsigned long auth_tag_len), Authenticated Tag Length in bytes. * Valid values are 16 (most likely), 12 or 8. */ asmlinkage void aesni_gcm_enc(void *ctx, u8 *out, const u8 *in, unsigned long plaintext_len, u8 *iv, u8 *hash_subkey, const u8 *aad, unsigned long aad_len, u8 *auth_tag, unsigned long auth_tag_len); /* asmlinkage void aesni_gcm_dec() * void *ctx, AES Key schedule. Starts on a 16 byte boundary. * u8 *out, Plaintext output. Decrypt in-place is allowed. * const u8 *in, Ciphertext input * unsigned long ciphertext_len, Length of data in bytes for decryption. * u8 *iv, Pre-counter block j0: 4 byte salt (from Security Association) * concatenated with 8 byte Initialisation Vector (from IPSec ESP * Payload) concatenated with 0x00000001. 16-byte aligned pointer. * u8 *hash_subkey, the Hash sub key input. Data starts on a 16-byte boundary. * const u8 *aad, Additional Authentication Data (AAD) * unsigned long aad_len, Length of AAD in bytes. With RFC4106 this is going * to be 8 or 12 bytes * u8 *auth_tag, Authenticated Tag output. * unsigned long auth_tag_len) Authenticated Tag Length in bytes. * Valid values are 16 (most likely), 12 or 8. */ asmlinkage void aesni_gcm_dec(void *ctx, u8 *out, const u8 *in, unsigned long ciphertext_len, u8 *iv, u8 *hash_subkey, const u8 *aad, unsigned long aad_len, u8 *auth_tag, unsigned long auth_tag_len); #ifdef CONFIG_AS_AVX asmlinkage void aes_ctr_enc_128_avx_by8(const u8 *in, u8 *iv, void *keys, u8 *out, unsigned int num_bytes); asmlinkage void aes_ctr_enc_192_avx_by8(const u8 *in, u8 *iv, void *keys, u8 *out, unsigned int num_bytes); asmlinkage void aes_ctr_enc_256_avx_by8(const u8 *in, u8 *iv, void *keys, u8 *out, unsigned int num_bytes); /* * asmlinkage void aesni_gcm_precomp_avx_gen2() * gcm_data *my_ctx_data, context data * u8 *hash_subkey, the Hash sub key input. Data starts on a 16-byte boundary. */ asmlinkage void aesni_gcm_precomp_avx_gen2(void *my_ctx_data, u8 *hash_subkey); asmlinkage void aesni_gcm_enc_avx_gen2(void *ctx, u8 *out, const u8 *in, unsigned long plaintext_len, u8 *iv, const u8 *aad, unsigned long aad_len, u8 *auth_tag, unsigned long auth_tag_len); asmlinkage void aesni_gcm_dec_avx_gen2(void *ctx, u8 *out, const u8 *in, unsigned long ciphertext_len, u8 *iv, const u8 *aad, unsigned long aad_len, u8 *auth_tag, unsigned long auth_tag_len); static void aesni_gcm_enc_avx(void *ctx, u8 *out, const u8 *in, unsigned long plaintext_len, u8 *iv, u8 *hash_subkey, const u8 *aad, unsigned long aad_len, u8 *auth_tag, unsigned long auth_tag_len) { struct crypto_aes_ctx *aes_ctx = (struct crypto_aes_ctx*)ctx; if ((plaintext_len < AVX_GEN2_OPTSIZE) || (aes_ctx-> key_length != AES_KEYSIZE_128)){ aesni_gcm_enc(ctx, out, in, plaintext_len, iv, hash_subkey, aad, aad_len, auth_tag, auth_tag_len); } else { aesni_gcm_precomp_avx_gen2(ctx, hash_subkey); aesni_gcm_enc_avx_gen2(ctx, out, in, plaintext_len, iv, aad, aad_len, auth_tag, auth_tag_len); } } static void aesni_gcm_dec_avx(void *ctx, u8 *out, const u8 *in, unsigned long ciphertext_len, u8 *iv, u8 *hash_subkey, const u8 *aad, unsigned long aad_len, u8 *auth_tag, unsigned long auth_tag_len) { struct crypto_aes_ctx *aes_ctx = (struct crypto_aes_ctx*)ctx; if ((ciphertext_len < AVX_GEN2_OPTSIZE) || (aes_ctx-> key_length != AES_KEYSIZE_128)) { aesni_gcm_dec(ctx, out, in, ciphertext_len, iv, hash_subkey, aad, aad_len, auth_tag, auth_tag_len); } else { aesni_gcm_precomp_avx_gen2(ctx, hash_subkey); aesni_gcm_dec_avx_gen2(ctx, out, in, ciphertext_len, iv, aad, aad_len, auth_tag, auth_tag_len); } } #endif #ifdef CONFIG_AS_AVX2 /* * asmlinkage void aesni_gcm_precomp_avx_gen4() * gcm_data *my_ctx_data, context data * u8 *hash_subkey, the Hash sub key input. Data starts on a 16-byte boundary. */ asmlinkage void aesni_gcm_precomp_avx_gen4(void *my_ctx_data, u8 *hash_subkey); asmlinkage void aesni_gcm_enc_avx_gen4(void *ctx, u8 *out, const u8 *in, unsigned long plaintext_len, u8 *iv, const u8 *aad, unsigned long aad_len, u8 *auth_tag, unsigned long auth_tag_len); asmlinkage void aesni_gcm_dec_avx_gen4(void *ctx, u8 *out, const u8 *in, unsigned long ciphertext_len, u8 *iv, const u8 *aad, unsigned long aad_len, u8 *auth_tag, unsigned long auth_tag_len); static void aesni_gcm_enc_avx2(void *ctx, u8 *out, const u8 *in, unsigned long plaintext_len, u8 *iv, u8 *hash_subkey, const u8 *aad, unsigned long aad_len, u8 *auth_tag, unsigned long auth_tag_len) { struct crypto_aes_ctx *aes_ctx = (struct crypto_aes_ctx*)ctx; if ((plaintext_len < AVX_GEN2_OPTSIZE) || (aes_ctx-> key_length != AES_KEYSIZE_128)) { aesni_gcm_enc(ctx, out, in, plaintext_len, iv, hash_subkey, aad, aad_len, auth_tag, auth_tag_len); } else if (plaintext_len < AVX_GEN4_OPTSIZE) { aesni_gcm_precomp_avx_gen2(ctx, hash_subkey); aesni_gcm_enc_avx_gen2(ctx, out, in, plaintext_len, iv, aad, aad_len, auth_tag, auth_tag_len); } else { aesni_gcm_precomp_avx_gen4(ctx, hash_subkey); aesni_gcm_enc_avx_gen4(ctx, out, in, plaintext_len, iv, aad, aad_len, auth_tag, auth_tag_len); } } static void aesni_gcm_dec_avx2(void *ctx, u8 *out, const u8 *in, unsigned long ciphertext_len, u8 *iv, u8 *hash_subkey, const u8 *aad, unsigned long aad_len, u8 *auth_tag, unsigned long auth_tag_len) { struct crypto_aes_ctx *aes_ctx = (struct crypto_aes_ctx*)ctx; if ((ciphertext_len < AVX_GEN2_OPTSIZE) || (aes_ctx-> key_length != AES_KEYSIZE_128)) { aesni_gcm_dec(ctx, out, in, ciphertext_len, iv, hash_subkey, aad, aad_len, auth_tag, auth_tag_len); } else if (ciphertext_len < AVX_GEN4_OPTSIZE) { aesni_gcm_precomp_avx_gen2(ctx, hash_subkey); aesni_gcm_dec_avx_gen2(ctx, out, in, ciphertext_len, iv, aad, aad_len, auth_tag, auth_tag_len); } else { aesni_gcm_precomp_avx_gen4(ctx, hash_subkey); aesni_gcm_dec_avx_gen4(ctx, out, in, ciphertext_len, iv, aad, aad_len, auth_tag, auth_tag_len); } } #endif static void (*aesni_gcm_enc_tfm)(void *ctx, u8 *out, const u8 *in, unsigned long plaintext_len, u8 *iv, u8 *hash_subkey, const u8 *aad, unsigned long aad_len, u8 *auth_tag, unsigned long auth_tag_len); static void (*aesni_gcm_dec_tfm)(void *ctx, u8 *out, const u8 *in, unsigned long ciphertext_len, u8 *iv, u8 *hash_subkey, const u8 *aad, unsigned long aad_len, u8 *auth_tag, unsigned long auth_tag_len); static inline struct aesni_rfc4106_gcm_ctx *aesni_rfc4106_gcm_ctx_get(struct crypto_aead *tfm) { unsigned long align = AESNI_ALIGN; if (align <= crypto_tfm_ctx_alignment()) align = 1; return PTR_ALIGN(crypto_aead_ctx(tfm), align); } #endif static inline struct crypto_aes_ctx *aes_ctx(void *raw_ctx) { unsigned long addr = (unsigned long)raw_ctx; unsigned long align = AESNI_ALIGN; if (align <= crypto_tfm_ctx_alignment()) align = 1; return (struct crypto_aes_ctx *)ALIGN(addr, align); } static int aes_set_key_common(struct crypto_tfm *tfm, void *raw_ctx, const u8 *in_key, unsigned int key_len) { struct crypto_aes_ctx *ctx = aes_ctx(raw_ctx); u32 *flags = &tfm->crt_flags; int err; if (key_len != AES_KEYSIZE_128 && key_len != AES_KEYSIZE_192 && key_len != AES_KEYSIZE_256) { *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; return -EINVAL; } if (!irq_fpu_usable()) err = crypto_aes_expand_key(ctx, in_key, key_len); else { kernel_fpu_begin(); err = aesni_set_key(ctx, in_key, key_len); kernel_fpu_end(); } return err; } static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key, unsigned int key_len) { return aes_set_key_common(tfm, crypto_tfm_ctx(tfm), in_key, key_len); } static void aes_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) { struct crypto_aes_ctx *ctx = aes_ctx(crypto_tfm_ctx(tfm)); if (!irq_fpu_usable()) crypto_aes_encrypt_x86(ctx, dst, src); else { kernel_fpu_begin(); aesni_enc(ctx, dst, src); kernel_fpu_end(); } } static void aes_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) { struct crypto_aes_ctx *ctx = aes_ctx(crypto_tfm_ctx(tfm)); if (!irq_fpu_usable()) crypto_aes_decrypt_x86(ctx, dst, src); else { kernel_fpu_begin(); aesni_dec(ctx, dst, src); kernel_fpu_end(); } } static void __aes_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) { struct crypto_aes_ctx *ctx = aes_ctx(crypto_tfm_ctx(tfm)); aesni_enc(ctx, dst, src); } static void __aes_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) { struct crypto_aes_ctx *ctx = aes_ctx(crypto_tfm_ctx(tfm)); aesni_dec(ctx, dst, src); } static int aesni_skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key, unsigned int len) { return aes_set_key_common(crypto_skcipher_tfm(tfm), crypto_skcipher_ctx(tfm), key, len); } static int ecb_encrypt(struct skcipher_request *req) { struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); struct crypto_aes_ctx *ctx = aes_ctx(crypto_skcipher_ctx(tfm)); struct skcipher_walk walk; unsigned int nbytes; int err; err = skcipher_walk_virt(&walk, req, true); kernel_fpu_begin(); while ((nbytes = walk.nbytes)) { aesni_ecb_enc(ctx, walk.dst.virt.addr, walk.src.virt.addr, nbytes & AES_BLOCK_MASK); nbytes &= AES_BLOCK_SIZE - 1; err = skcipher_walk_done(&walk, nbytes); } kernel_fpu_end(); return err; } static int ecb_decrypt(struct skcipher_request *req) { struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); struct crypto_aes_ctx *ctx = aes_ctx(crypto_skcipher_ctx(tfm)); struct skcipher_walk walk; unsigned int nbytes; int err; err = skcipher_walk_virt(&walk, req, true); kernel_fpu_begin(); while ((nbytes = walk.nbytes)) { aesni_ecb_dec(ctx, walk.dst.virt.addr, walk.src.virt.addr, nbytes & AES_BLOCK_MASK); nbytes &= AES_BLOCK_SIZE - 1; err = skcipher_walk_done(&walk, nbytes); } kernel_fpu_end(); return err; } static int cbc_encrypt(struct skcipher_request *req) { struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); struct crypto_aes_ctx *ctx = aes_ctx(crypto_skcipher_ctx(tfm)); struct skcipher_walk walk; unsigned int nbytes; int err; err = skcipher_walk_virt(&walk, req, true); kernel_fpu_begin(); while ((nbytes = walk.nbytes)) { aesni_cbc_enc(ctx, walk.dst.virt.addr, walk.src.virt.addr, nbytes & AES_BLOCK_MASK, walk.iv); nbytes &= AES_BLOCK_SIZE - 1; err = skcipher_walk_done(&walk, nbytes); } kernel_fpu_end(); return err; } static int cbc_decrypt(struct skcipher_request *req) { struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); struct crypto_aes_ctx *ctx = aes_ctx(crypto_skcipher_ctx(tfm)); struct skcipher_walk walk; unsigned int nbytes; int err; err = skcipher_walk_virt(&walk, req, true); kernel_fpu_begin(); while ((nbytes = walk.nbytes)) { aesni_cbc_dec(ctx, walk.dst.virt.addr, walk.src.virt.addr, nbytes & AES_BLOCK_MASK, walk.iv); nbytes &= AES_BLOCK_SIZE - 1; err = skcipher_walk_done(&walk, nbytes); } kernel_fpu_end(); return err; } #ifdef CONFIG_X86_64 static void ctr_crypt_final(struct crypto_aes_ctx *ctx, struct skcipher_walk *walk) { u8 *ctrblk = walk->iv; u8 keystream[AES_BLOCK_SIZE]; u8 *src = walk->src.virt.addr; u8 *dst = walk->dst.virt.addr; unsigned int nbytes = walk->nbytes; aesni_enc(ctx, keystream, ctrblk); crypto_xor(keystream, src, nbytes); memcpy(dst, keystream, nbytes); crypto_inc(ctrblk, AES_BLOCK_SIZE); } #ifdef CONFIG_AS_AVX static void aesni_ctr_enc_avx_tfm(struct crypto_aes_ctx *ctx, u8 *out, const u8 *in, unsigned int len, u8 *iv) { /* * based on key length, override with the by8 version * of ctr mode encryption/decryption for improved performance * aes_set_key_common() ensures that key length is one of * {128,192,256} */ if (ctx->key_length == AES_KEYSIZE_128) aes_ctr_enc_128_avx_by8(in, iv, (void *)ctx, out, len); else if (ctx->key_length == AES_KEYSIZE_192) aes_ctr_enc_192_avx_by8(in, iv, (void *)ctx, out, len); else aes_ctr_enc_256_avx_by8(in, iv, (void *)ctx, out, len); } #endif static int ctr_crypt(struct skcipher_request *req) { struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); struct crypto_aes_ctx *ctx = aes_ctx(crypto_skcipher_ctx(tfm)); struct skcipher_walk walk; unsigned int nbytes; int err; err = skcipher_walk_virt(&walk, req, true); kernel_fpu_begin(); while ((nbytes = walk.nbytes) >= AES_BLOCK_SIZE) { aesni_ctr_enc_tfm(ctx, walk.dst.virt.addr, walk.src.virt.addr, nbytes & AES_BLOCK_MASK, walk.iv); nbytes &= AES_BLOCK_SIZE - 1; err = skcipher_walk_done(&walk, nbytes); } if (walk.nbytes) { ctr_crypt_final(ctx, &walk); err = skcipher_walk_done(&walk, 0); } kernel_fpu_end(); return err; } static int xts_aesni_setkey(struct crypto_skcipher *tfm, const u8 *key, unsigned int keylen) { struct aesni_xts_ctx *ctx = crypto_skcipher_ctx(tfm); int err; err = xts_verify_key(tfm, key, keylen); if (err) return err; keylen /= 2; /* first half of xts-key is for crypt */ err = aes_set_key_common(crypto_skcipher_tfm(tfm), ctx->raw_crypt_ctx, key, keylen); if (err) return err; /* second half of xts-key is for tweak */ return aes_set_key_common(crypto_skcipher_tfm(tfm), ctx->raw_tweak_ctx, key + keylen, keylen); } static void aesni_xts_tweak(void *ctx, u8 *out, const u8 *in) { aesni_enc(ctx, out, in); } static void aesni_xts_enc(void *ctx, u128 *dst, const u128 *src, le128 *iv) { glue_xts_crypt_128bit_one(ctx, dst, src, iv, GLUE_FUNC_CAST(aesni_enc)); } static void aesni_xts_dec(void *ctx, u128 *dst, const u128 *src, le128 *iv) { glue_xts_crypt_128bit_one(ctx, dst, src, iv, GLUE_FUNC_CAST(aesni_dec)); } static void aesni_xts_enc8(void *ctx, u128 *dst, const u128 *src, le128 *iv) { aesni_xts_crypt8(ctx, (u8 *)dst, (const u8 *)src, true, (u8 *)iv); } static void aesni_xts_dec8(void *ctx, u128 *dst, const u128 *src, le128 *iv) { aesni_xts_crypt8(ctx, (u8 *)dst, (const u8 *)src, false, (u8 *)iv); } static const struct common_glue_ctx aesni_enc_xts = { .num_funcs = 2, .fpu_blocks_limit = 1, .funcs = { { .num_blocks = 8, .fn_u = { .xts = GLUE_XTS_FUNC_CAST(aesni_xts_enc8) } }, { .num_blocks = 1, .fn_u = { .xts = GLUE_XTS_FUNC_CAST(aesni_xts_enc) } } } }; static const struct common_glue_ctx aesni_dec_xts = { .num_funcs = 2, .fpu_blocks_limit = 1, .funcs = { { .num_blocks = 8, .fn_u = { .xts = GLUE_XTS_FUNC_CAST(aesni_xts_dec8) } }, { .num_blocks = 1, .fn_u = { .xts = GLUE_XTS_FUNC_CAST(aesni_xts_dec) } } } }; static int xts_encrypt(struct skcipher_request *req) { struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); struct aesni_xts_ctx *ctx = crypto_skcipher_ctx(tfm); return glue_xts_req_128bit(&aesni_enc_xts, req, XTS_TWEAK_CAST(aesni_xts_tweak), aes_ctx(ctx->raw_tweak_ctx), aes_ctx(ctx->raw_crypt_ctx)); } static int xts_decrypt(struct skcipher_request *req) { struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); struct aesni_xts_ctx *ctx = crypto_skcipher_ctx(tfm); return glue_xts_req_128bit(&aesni_dec_xts, req, XTS_TWEAK_CAST(aesni_xts_tweak), aes_ctx(ctx->raw_tweak_ctx), aes_ctx(ctx->raw_crypt_ctx)); } static int rfc4106_init(struct crypto_aead *aead) { struct cryptd_aead *cryptd_tfm; struct cryptd_aead **ctx = crypto_aead_ctx(aead); cryptd_tfm = cryptd_alloc_aead("__driver-gcm-aes-aesni", CRYPTO_ALG_INTERNAL, CRYPTO_ALG_INTERNAL); if (IS_ERR(cryptd_tfm)) return PTR_ERR(cryptd_tfm); *ctx = cryptd_tfm; crypto_aead_set_reqsize(aead, crypto_aead_reqsize(&cryptd_tfm->base)); return 0; } static void rfc4106_exit(struct crypto_aead *aead) { struct cryptd_aead **ctx = crypto_aead_ctx(aead); cryptd_free_aead(*ctx); } static int rfc4106_set_hash_subkey(u8 *hash_subkey, const u8 *key, unsigned int key_len) { struct crypto_cipher *tfm; int ret; tfm = crypto_alloc_cipher("aes", 0, 0); if (IS_ERR(tfm)) return PTR_ERR(tfm); ret = crypto_cipher_setkey(tfm, key, key_len); if (ret) goto out_free_cipher; /* Clear the data in the hash sub key container to zero.*/ /* We want to cipher all zeros to create the hash sub key. */ memset(hash_subkey, 0, RFC4106_HASH_SUBKEY_SIZE); crypto_cipher_encrypt_one(tfm, hash_subkey, hash_subkey); out_free_cipher: crypto_free_cipher(tfm); return ret; } static int common_rfc4106_set_key(struct crypto_aead *aead, const u8 *key, unsigned int key_len) { struct aesni_rfc4106_gcm_ctx *ctx = aesni_rfc4106_gcm_ctx_get(aead); if (key_len < 4) { crypto_aead_set_flags(aead, CRYPTO_TFM_RES_BAD_KEY_LEN); return -EINVAL; } /*Account for 4 byte nonce at the end.*/ key_len -= 4; memcpy(ctx->nonce, key + key_len, sizeof(ctx->nonce)); return aes_set_key_common(crypto_aead_tfm(aead), &ctx->aes_key_expanded, key, key_len) ?: rfc4106_set_hash_subkey(ctx->hash_subkey, key, key_len); } static int rfc4106_set_key(struct crypto_aead *parent, const u8 *key, unsigned int key_len) { struct cryptd_aead **ctx = crypto_aead_ctx(parent); struct cryptd_aead *cryptd_tfm = *ctx; return crypto_aead_setkey(&cryptd_tfm->base, key, key_len); } static int common_rfc4106_set_authsize(struct crypto_aead *aead, unsigned int authsize) { switch (authsize) { case 8: case 12: case 16: break; default: return -EINVAL; } return 0; } /* This is the Integrity Check Value (aka the authentication tag length and can * be 8, 12 or 16 bytes long. */ static int rfc4106_set_authsize(struct crypto_aead *parent, unsigned int authsize) { struct cryptd_aead **ctx = crypto_aead_ctx(parent); struct cryptd_aead *cryptd_tfm = *ctx; return crypto_aead_setauthsize(&cryptd_tfm->base, authsize); } static int helper_rfc4106_encrypt(struct aead_request *req) { u8 one_entry_in_sg = 0; u8 *src, *dst, *assoc; __be32 counter = cpu_to_be32(1); struct crypto_aead *tfm = crypto_aead_reqtfm(req); struct aesni_rfc4106_gcm_ctx *ctx = aesni_rfc4106_gcm_ctx_get(tfm); void *aes_ctx = &(ctx->aes_key_expanded); unsigned long auth_tag_len = crypto_aead_authsize(tfm); u8 iv[16] __attribute__ ((__aligned__(AESNI_ALIGN))); struct scatter_walk src_sg_walk; struct scatter_walk dst_sg_walk = {}; unsigned int i; /* Assuming we are supporting rfc4106 64-bit extended */ /* sequence numbers We need to have the AAD length equal */ /* to 16 or 20 bytes */ if (unlikely(req->assoclen != 16 && req->assoclen != 20)) return -EINVAL; /* IV below built */ for (i = 0; i < 4; i++) *(iv+i) = ctx->nonce[i]; for (i = 0; i < 8; i++) *(iv+4+i) = req->iv[i]; *((__be32 *)(iv+12)) = counter; if (sg_is_last(req->src) && (!PageHighMem(sg_page(req->src)) || req->src->offset + req->src->length <= PAGE_SIZE) && sg_is_last(req->dst) && (!PageHighMem(sg_page(req->dst)) || req->dst->offset + req->dst->length <= PAGE_SIZE)) { one_entry_in_sg = 1; scatterwalk_start(&src_sg_walk, req->src); assoc = scatterwalk_map(&src_sg_walk); src = assoc + req->assoclen; dst = src; if (unlikely(req->src != req->dst)) { scatterwalk_start(&dst_sg_walk, req->dst); dst = scatterwalk_map(&dst_sg_walk) + req->assoclen; } } else { /* Allocate memory for src, dst, assoc */ assoc = kmalloc(req->cryptlen + auth_tag_len + req->assoclen, GFP_ATOMIC); if (unlikely(!assoc)) return -ENOMEM; scatterwalk_map_and_copy(assoc, req->src, 0, req->assoclen + req->cryptlen, 0); src = assoc + req->assoclen; dst = src; } kernel_fpu_begin(); aesni_gcm_enc_tfm(aes_ctx, dst, src, req->cryptlen, iv, ctx->hash_subkey, assoc, req->assoclen - 8, dst + req->cryptlen, auth_tag_len); kernel_fpu_end(); /* The authTag (aka the Integrity Check Value) needs to be written * back to the packet. */ if (one_entry_in_sg) { if (unlikely(req->src != req->dst)) { scatterwalk_unmap(dst - req->assoclen); scatterwalk_advance(&dst_sg_walk, req->dst->length); scatterwalk_done(&dst_sg_walk, 1, 0); } scatterwalk_unmap(assoc); scatterwalk_advance(&src_sg_walk, req->src->length); scatterwalk_done(&src_sg_walk, req->src == req->dst, 0); } else { scatterwalk_map_and_copy(dst, req->dst, req->assoclen, req->cryptlen + auth_tag_len, 1); kfree(assoc); } return 0; } static int helper_rfc4106_decrypt(struct aead_request *req) { u8 one_entry_in_sg = 0; u8 *src, *dst, *assoc; unsigned long tempCipherLen = 0; __be32 counter = cpu_to_be32(1); int retval = 0; struct crypto_aead *tfm = crypto_aead_reqtfm(req); struct aesni_rfc4106_gcm_ctx *ctx = aesni_rfc4106_gcm_ctx_get(tfm); void *aes_ctx = &(ctx->aes_key_expanded); unsigned long auth_tag_len = crypto_aead_authsize(tfm); u8 iv[16] __attribute__ ((__aligned__(AESNI_ALIGN))); u8 authTag[16]; struct scatter_walk src_sg_walk; struct scatter_walk dst_sg_walk = {}; unsigned int i; if (unlikely(req->assoclen != 16 && req->assoclen != 20)) return -EINVAL; /* Assuming we are supporting rfc4106 64-bit extended */ /* sequence numbers We need to have the AAD length */ /* equal to 16 or 20 bytes */ tempCipherLen = (unsigned long)(req->cryptlen - auth_tag_len); /* IV below built */ for (i = 0; i < 4; i++) *(iv+i) = ctx->nonce[i]; for (i = 0; i < 8; i++) *(iv+4+i) = req->iv[i]; *((__be32 *)(iv+12)) = counter; if (sg_is_last(req->src) && (!PageHighMem(sg_page(req->src)) || req->src->offset + req->src->length <= PAGE_SIZE) && sg_is_last(req->dst) && (!PageHighMem(sg_page(req->dst)) || req->dst->offset + req->dst->length <= PAGE_SIZE)) { one_entry_in_sg = 1; scatterwalk_start(&src_sg_walk, req->src); assoc = scatterwalk_map(&src_sg_walk); src = assoc + req->assoclen; dst = src; if (unlikely(req->src != req->dst)) { scatterwalk_start(&dst_sg_walk, req->dst); dst = scatterwalk_map(&dst_sg_walk) + req->assoclen; } } else { /* Allocate memory for src, dst, assoc */ assoc = kmalloc(req->cryptlen + req->assoclen, GFP_ATOMIC); if (!assoc) return -ENOMEM; scatterwalk_map_and_copy(assoc, req->src, 0, req->assoclen + req->cryptlen, 0); src = assoc + req->assoclen; dst = src; } kernel_fpu_begin(); aesni_gcm_dec_tfm(aes_ctx, dst, src, tempCipherLen, iv, ctx->hash_subkey, assoc, req->assoclen - 8, authTag, auth_tag_len); kernel_fpu_end(); /* Compare generated tag with passed in tag. */ retval = crypto_memneq(src + tempCipherLen, authTag, auth_tag_len) ? -EBADMSG : 0; if (one_entry_in_sg) { if (unlikely(req->src != req->dst)) { scatterwalk_unmap(dst - req->assoclen); scatterwalk_advance(&dst_sg_walk, req->dst->length); scatterwalk_done(&dst_sg_walk, 1, 0); } scatterwalk_unmap(assoc); scatterwalk_advance(&src_sg_walk, req->src->length); scatterwalk_done(&src_sg_walk, req->src == req->dst, 0); } else { scatterwalk_map_and_copy(dst, req->dst, req->assoclen, tempCipherLen, 1); kfree(assoc); } return retval; } static int rfc4106_encrypt(struct aead_request *req) { struct crypto_aead *tfm = crypto_aead_reqtfm(req); struct cryptd_aead **ctx = crypto_aead_ctx(tfm); struct cryptd_aead *cryptd_tfm = *ctx; tfm = &cryptd_tfm->base; if (irq_fpu_usable() && (!in_atomic() || !cryptd_aead_queued(cryptd_tfm))) tfm = cryptd_aead_child(cryptd_tfm); aead_request_set_tfm(req, tfm); return crypto_aead_encrypt(req); } static int rfc4106_decrypt(struct aead_request *req) { struct crypto_aead *tfm = crypto_aead_reqtfm(req); struct cryptd_aead **ctx = crypto_aead_ctx(tfm); struct cryptd_aead *cryptd_tfm = *ctx; tfm = &cryptd_tfm->base; if (irq_fpu_usable() && (!in_atomic() || !cryptd_aead_queued(cryptd_tfm))) tfm = cryptd_aead_child(cryptd_tfm); aead_request_set_tfm(req, tfm); return crypto_aead_decrypt(req); } #endif static struct crypto_alg aesni_algs[] = { { .cra_name = "aes", .cra_driver_name = "aes-aesni", .cra_priority = 300, .cra_flags = CRYPTO_ALG_TYPE_CIPHER, .cra_blocksize = AES_BLOCK_SIZE, .cra_ctxsize = CRYPTO_AES_CTX_SIZE, .cra_module = THIS_MODULE, .cra_u = { .cipher = { .cia_min_keysize = AES_MIN_KEY_SIZE, .cia_max_keysize = AES_MAX_KEY_SIZE, .cia_setkey = aes_set_key, .cia_encrypt = aes_encrypt, .cia_decrypt = aes_decrypt } } }, { .cra_name = "__aes", .cra_driver_name = "__aes-aesni", .cra_priority = 300, .cra_flags = CRYPTO_ALG_TYPE_CIPHER | CRYPTO_ALG_INTERNAL, .cra_blocksize = AES_BLOCK_SIZE, .cra_ctxsize = CRYPTO_AES_CTX_SIZE, .cra_module = THIS_MODULE, .cra_u = { .cipher = { .cia_min_keysize = AES_MIN_KEY_SIZE, .cia_max_keysize = AES_MAX_KEY_SIZE, .cia_setkey = aes_set_key, .cia_encrypt = __aes_encrypt, .cia_decrypt = __aes_decrypt } } } }; static struct skcipher_alg aesni_skciphers[] = { { .base = { .cra_name = "__ecb(aes)", .cra_driver_name = "__ecb-aes-aesni", .cra_priority = 400, .cra_flags = CRYPTO_ALG_INTERNAL, .cra_blocksize = AES_BLOCK_SIZE, .cra_ctxsize = CRYPTO_AES_CTX_SIZE, .cra_module = THIS_MODULE, }, .min_keysize = AES_MIN_KEY_SIZE, .max_keysize = AES_MAX_KEY_SIZE, .setkey = aesni_skcipher_setkey, .encrypt = ecb_encrypt, .decrypt = ecb_decrypt, }, { .base = { .cra_name = "__cbc(aes)", .cra_driver_name = "__cbc-aes-aesni", .cra_priority = 400, .cra_flags = CRYPTO_ALG_INTERNAL, .cra_blocksize = AES_BLOCK_SIZE, .cra_ctxsize = CRYPTO_AES_CTX_SIZE, .cra_module = THIS_MODULE, }, .min_keysize = AES_MIN_KEY_SIZE, .max_keysize = AES_MAX_KEY_SIZE, .ivsize = AES_BLOCK_SIZE, .setkey = aesni_skcipher_setkey, .encrypt = cbc_encrypt, .decrypt = cbc_decrypt, #ifdef CONFIG_X86_64 }, { .base = { .cra_name = "__ctr(aes)", .cra_driver_name = "__ctr-aes-aesni", .cra_priority = 400, .cra_flags = CRYPTO_ALG_INTERNAL, .cra_blocksize = 1, .cra_ctxsize = CRYPTO_AES_CTX_SIZE, .cra_module = THIS_MODULE, }, .min_keysize = AES_MIN_KEY_SIZE, .max_keysize = AES_MAX_KEY_SIZE, .ivsize = AES_BLOCK_SIZE, .chunksize = AES_BLOCK_SIZE, .setkey = aesni_skcipher_setkey, .encrypt = ctr_crypt, .decrypt = ctr_crypt, }, { .base = { .cra_name = "__xts(aes)", .cra_driver_name = "__xts-aes-aesni", .cra_priority = 401, .cra_flags = CRYPTO_ALG_INTERNAL, .cra_blocksize = AES_BLOCK_SIZE, .cra_ctxsize = XTS_AES_CTX_SIZE, .cra_module = THIS_MODULE, }, .min_keysize = 2 * AES_MIN_KEY_SIZE, .max_keysize = 2 * AES_MAX_KEY_SIZE, .ivsize = AES_BLOCK_SIZE, .setkey = xts_aesni_setkey, .encrypt = xts_encrypt, .decrypt = xts_decrypt, #endif } }; struct simd_skcipher_alg *aesni_simd_skciphers[ARRAY_SIZE(aesni_skciphers)]; struct { const char *algname; const char *drvname; const char *basename; struct simd_skcipher_alg *simd; } aesni_simd_skciphers2[] = { #if IS_ENABLED(CONFIG_CRYPTO_PCBC) { .algname = "pcbc(aes)", .drvname = "pcbc-aes-aesni", .basename = "fpu(pcbc(__aes-aesni))", }, #endif }; #ifdef CONFIG_X86_64 static struct aead_alg aesni_aead_algs[] = { { .setkey = common_rfc4106_set_key, .setauthsize = common_rfc4106_set_authsize, .encrypt = helper_rfc4106_encrypt, .decrypt = helper_rfc4106_decrypt, .ivsize = 8, .maxauthsize = 16, .base = { .cra_name = "__gcm-aes-aesni", .cra_driver_name = "__driver-gcm-aes-aesni", .cra_flags = CRYPTO_ALG_INTERNAL, .cra_blocksize = 1, .cra_ctxsize = sizeof(struct aesni_rfc4106_gcm_ctx), .cra_alignmask = AESNI_ALIGN - 1, .cra_module = THIS_MODULE, }, }, { .init = rfc4106_init, .exit = rfc4106_exit, .setkey = rfc4106_set_key, .setauthsize = rfc4106_set_authsize, .encrypt = rfc4106_encrypt, .decrypt = rfc4106_decrypt, .ivsize = 8, .maxauthsize = 16, .base = { .cra_name = "rfc4106(gcm(aes))", .cra_driver_name = "rfc4106-gcm-aesni", .cra_priority = 400, .cra_flags = CRYPTO_ALG_ASYNC, .cra_blocksize = 1, .cra_ctxsize = sizeof(struct cryptd_aead *), .cra_module = THIS_MODULE, }, } }; #else static struct aead_alg aesni_aead_algs[0]; #endif static const struct x86_cpu_id aesni_cpu_id[] = { X86_FEATURE_MATCH(X86_FEATURE_AES), {} }; MODULE_DEVICE_TABLE(x86cpu, aesni_cpu_id); static void aesni_free_simds(void) { int i; for (i = 0; i < ARRAY_SIZE(aesni_simd_skciphers) && aesni_simd_skciphers[i]; i++) simd_skcipher_free(aesni_simd_skciphers[i]); for (i = 0; i < ARRAY_SIZE(aesni_simd_skciphers2) && aesni_simd_skciphers2[i].simd; i++) simd_skcipher_free(aesni_simd_skciphers2[i].simd); } static int __init aesni_init(void) { struct simd_skcipher_alg *simd; const char *basename; const char *algname; const char *drvname; int err; int i; if (!x86_match_cpu(aesni_cpu_id)) return -ENODEV; #ifdef CONFIG_X86_64 #ifdef CONFIG_AS_AVX2 if (boot_cpu_has(X86_FEATURE_AVX2)) { pr_info("AVX2 version of gcm_enc/dec engaged.\n"); aesni_gcm_enc_tfm = aesni_gcm_enc_avx2; aesni_gcm_dec_tfm = aesni_gcm_dec_avx2; } else #endif #ifdef CONFIG_AS_AVX if (boot_cpu_has(X86_FEATURE_AVX)) { pr_info("AVX version of gcm_enc/dec engaged.\n"); aesni_gcm_enc_tfm = aesni_gcm_enc_avx; aesni_gcm_dec_tfm = aesni_gcm_dec_avx; } else #endif { pr_info("SSE version of gcm_enc/dec engaged.\n"); aesni_gcm_enc_tfm = aesni_gcm_enc; aesni_gcm_dec_tfm = aesni_gcm_dec; } aesni_ctr_enc_tfm = aesni_ctr_enc; #ifdef CONFIG_AS_AVX if (boot_cpu_has(X86_FEATURE_AVX)) { /* optimize performance of ctr mode encryption transform */ aesni_ctr_enc_tfm = aesni_ctr_enc_avx_tfm; pr_info("AES CTR mode by8 optimization enabled\n"); } #endif #endif err = crypto_fpu_init(); if (err) return err; err = crypto_register_algs(aesni_algs, ARRAY_SIZE(aesni_algs)); if (err) goto fpu_exit; err = crypto_register_skciphers(aesni_skciphers, ARRAY_SIZE(aesni_skciphers)); if (err) goto unregister_algs; err = crypto_register_aeads(aesni_aead_algs, ARRAY_SIZE(aesni_aead_algs)); if (err) goto unregister_skciphers; for (i = 0; i < ARRAY_SIZE(aesni_skciphers); i++) { algname = aesni_skciphers[i].base.cra_name + 2; drvname = aesni_skciphers[i].base.cra_driver_name + 2; basename = aesni_skciphers[i].base.cra_driver_name; simd = simd_skcipher_create_compat(algname, drvname, basename); err = PTR_ERR(simd); if (IS_ERR(simd)) goto unregister_simds; aesni_simd_skciphers[i] = simd; } for (i = 0; i < ARRAY_SIZE(aesni_simd_skciphers2); i++) { algname = aesni_simd_skciphers2[i].algname; drvname = aesni_simd_skciphers2[i].drvname; basename = aesni_simd_skciphers2[i].basename; simd = simd_skcipher_create_compat(algname, drvname, basename); err = PTR_ERR(simd); if (IS_ERR(simd)) goto unregister_simds; aesni_simd_skciphers2[i].simd = simd; } return 0; unregister_simds: aesni_free_simds(); crypto_unregister_aeads(aesni_aead_algs, ARRAY_SIZE(aesni_aead_algs)); unregister_skciphers: crypto_unregister_skciphers(aesni_skciphers, ARRAY_SIZE(aesni_skciphers)); unregister_algs: crypto_unregister_algs(aesni_algs, ARRAY_SIZE(aesni_algs)); fpu_exit: crypto_fpu_exit(); return err; } static void __exit aesni_exit(void) { aesni_free_simds(); crypto_unregister_aeads(aesni_aead_algs, ARRAY_SIZE(aesni_aead_algs)); crypto_unregister_skciphers(aesni_skciphers, ARRAY_SIZE(aesni_skciphers)); crypto_unregister_algs(aesni_algs, ARRAY_SIZE(aesni_algs)); crypto_fpu_exit(); } late_initcall(aesni_init); module_exit(aesni_exit); MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm, Intel AES-NI instructions optimized"); MODULE_LICENSE("GPL"); MODULE_ALIAS_CRYPTO("aes");