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crypto: p10-aes-gcm - Glue code for AES/GCM stitched implementation
Signed-off-by: Danny Tsen <dtsen@linux.ibm.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Danny Tsen
Herbert Xu
parent
e70a329832
commit
cdcecfd999
345
arch/powerpc/crypto/aes-gcm-p10-glue.c
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345
arch/powerpc/crypto/aes-gcm-p10-glue.c
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Glue code for accelerated AES-GCM stitched implementation for ppc64le.
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*
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* Copyright 2022- IBM Inc. All rights reserved
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*/
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#include <asm/unaligned.h>
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#include <asm/simd.h>
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#include <asm/switch_to.h>
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#include <crypto/algapi.h>
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#include <crypto/aes.h>
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#include <crypto/algapi.h>
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#include <crypto/b128ops.h>
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#include <crypto/gf128mul.h>
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#include <crypto/internal/simd.h>
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#include <crypto/internal/aead.h>
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#include <crypto/internal/hash.h>
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#include <crypto/internal/skcipher.h>
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#include <crypto/scatterwalk.h>
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#include <linux/cpufeature.h>
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#include <linux/crypto.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#define PPC_MODULE_FEATURE_P10 (32 + ilog2(PPC_FEATURE2_ARCH_3_1))
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#define PPC_ALIGN 16
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#define GCM_IV_SIZE 12
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MODULE_DESCRIPTION("PPC64le AES-GCM with Stitched implementation");
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MODULE_AUTHOR("Danny Tsen <dtsen@linux.ibm.com");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS_CRYPTO("aes");
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asmlinkage int aes_p8_set_encrypt_key(const u8 *userKey, const int bits,
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void *key);
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asmlinkage void aes_p8_encrypt(const u8 *in, u8 *out, const void *key);
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asmlinkage void aes_p10_gcm_encrypt(u8 *in, u8 *out, size_t len,
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void *rkey, u8 *iv, void *Xi);
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asmlinkage void aes_p10_gcm_decrypt(u8 *in, u8 *out, size_t len,
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void *rkey, u8 *iv, void *Xi);
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asmlinkage void gcm_init_htable(unsigned char htable[256], unsigned char Xi[16]);
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asmlinkage void gcm_ghash_p8(unsigned char *Xi, unsigned char *Htable,
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unsigned char *aad, unsigned int alen);
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struct aes_key {
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u8 key[AES_MAX_KEYLENGTH];
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u64 rounds;
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};
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struct gcm_ctx {
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u8 iv[16];
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u8 ivtag[16];
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u8 aad_hash[16];
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u64 aadLen;
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u64 Plen; /* offset 56 - used in aes_p10_gcm_{en/de}crypt */
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};
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struct Hash_ctx {
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u8 H[16]; /* subkey */
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u8 Htable[256]; /* Xi, Hash table(offset 32) */
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};
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struct p10_aes_gcm_ctx {
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struct aes_key enc_key;
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};
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static void vsx_begin(void)
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{
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preempt_disable();
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enable_kernel_vsx();
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}
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static void vsx_end(void)
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{
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disable_kernel_vsx();
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preempt_enable();
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}
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static void set_subkey(unsigned char *hash)
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{
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*(u64 *)&hash[0] = be64_to_cpup((__be64 *)&hash[0]);
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*(u64 *)&hash[8] = be64_to_cpup((__be64 *)&hash[8]);
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}
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/*
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* Compute aad if any.
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* - Hash aad and copy to Xi.
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*/
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static void set_aad(struct gcm_ctx *gctx, struct Hash_ctx *hash,
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unsigned char *aad, int alen)
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{
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int i;
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u8 nXi[16] = {0, };
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gctx->aadLen = alen;
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i = alen & ~0xf;
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if (i) {
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gcm_ghash_p8(nXi, hash->Htable+32, aad, i);
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aad += i;
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alen -= i;
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}
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if (alen) {
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for (i = 0; i < alen; i++)
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nXi[i] ^= aad[i];
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memset(gctx->aad_hash, 0, 16);
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gcm_ghash_p8(gctx->aad_hash, hash->Htable+32, nXi, 16);
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} else {
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memcpy(gctx->aad_hash, nXi, 16);
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}
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memcpy(hash->Htable, gctx->aad_hash, 16);
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}
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static void gcmp10_init(struct gcm_ctx *gctx, u8 *iv, unsigned char *rdkey,
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struct Hash_ctx *hash, u8 *assoc, unsigned int assoclen)
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{
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__be32 counter = cpu_to_be32(1);
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aes_p8_encrypt(hash->H, hash->H, rdkey);
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set_subkey(hash->H);
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gcm_init_htable(hash->Htable+32, hash->H);
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*((__be32 *)(iv+12)) = counter;
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gctx->Plen = 0;
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/*
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* Encrypt counter vector as iv tag and increment counter.
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*/
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aes_p8_encrypt(iv, gctx->ivtag, rdkey);
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counter = cpu_to_be32(2);
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*((__be32 *)(iv+12)) = counter;
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memcpy(gctx->iv, iv, 16);
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gctx->aadLen = assoclen;
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memset(gctx->aad_hash, 0, 16);
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if (assoclen)
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set_aad(gctx, hash, assoc, assoclen);
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}
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static void finish_tag(struct gcm_ctx *gctx, struct Hash_ctx *hash, int len)
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{
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int i;
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unsigned char len_ac[16 + PPC_ALIGN];
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unsigned char *aclen = PTR_ALIGN((void *)len_ac, PPC_ALIGN);
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__be64 clen = cpu_to_be64(len << 3);
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__be64 alen = cpu_to_be64(gctx->aadLen << 3);
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if (len == 0 && gctx->aadLen == 0) {
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memcpy(hash->Htable, gctx->ivtag, 16);
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return;
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}
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/*
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* Len is in bits.
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*/
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*((__be64 *)(aclen)) = alen;
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*((__be64 *)(aclen+8)) = clen;
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/*
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* hash (AAD len and len)
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*/
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gcm_ghash_p8(hash->Htable, hash->Htable+32, aclen, 16);
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for (i = 0; i < 16; i++)
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hash->Htable[i] ^= gctx->ivtag[i];
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}
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static int set_authsize(struct crypto_aead *tfm, unsigned int authsize)
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{
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switch (authsize) {
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case 4:
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case 8:
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case 12:
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case 13:
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case 14:
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case 15:
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case 16:
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int p10_aes_gcm_setkey(struct crypto_aead *aead, const u8 *key,
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unsigned int keylen)
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{
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struct crypto_tfm *tfm = crypto_aead_tfm(aead);
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struct p10_aes_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
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int ret;
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vsx_begin();
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ret = aes_p8_set_encrypt_key(key, keylen * 8, &ctx->enc_key);
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vsx_end();
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return ret ? -EINVAL : 0;
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}
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static int p10_aes_gcm_crypt(struct aead_request *req, int enc)
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{
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struct crypto_tfm *tfm = req->base.tfm;
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struct p10_aes_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
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u8 databuf[sizeof(struct gcm_ctx) + PPC_ALIGN];
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struct gcm_ctx *gctx = PTR_ALIGN((void *)databuf, PPC_ALIGN);
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u8 hashbuf[sizeof(struct Hash_ctx) + PPC_ALIGN];
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struct Hash_ctx *hash = PTR_ALIGN((void *)hashbuf, PPC_ALIGN);
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struct scatter_walk assoc_sg_walk;
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struct skcipher_walk walk;
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u8 *assocmem = NULL;
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u8 *assoc;
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unsigned int assoclen = req->assoclen;
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unsigned int cryptlen = req->cryptlen;
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unsigned char ivbuf[AES_BLOCK_SIZE+PPC_ALIGN];
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unsigned char *iv = PTR_ALIGN((void *)ivbuf, PPC_ALIGN);
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int ret;
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unsigned long auth_tag_len = crypto_aead_authsize(__crypto_aead_cast(tfm));
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u8 otag[16];
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int total_processed = 0;
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memset(databuf, 0, sizeof(databuf));
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memset(hashbuf, 0, sizeof(hashbuf));
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memset(ivbuf, 0, sizeof(ivbuf));
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memcpy(iv, req->iv, GCM_IV_SIZE);
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/* Linearize assoc, if not already linear */
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if (req->src->length >= assoclen && req->src->length) {
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scatterwalk_start(&assoc_sg_walk, req->src);
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assoc = scatterwalk_map(&assoc_sg_walk);
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} else {
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gfp_t flags = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
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GFP_KERNEL : GFP_ATOMIC;
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/* assoc can be any length, so must be on heap */
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assocmem = kmalloc(assoclen, flags);
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if (unlikely(!assocmem))
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return -ENOMEM;
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assoc = assocmem;
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scatterwalk_map_and_copy(assoc, req->src, 0, assoclen, 0);
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}
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vsx_begin();
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gcmp10_init(gctx, iv, (unsigned char *) &ctx->enc_key, hash, assoc, assoclen);
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vsx_end();
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if (!assocmem)
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scatterwalk_unmap(assoc);
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else
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kfree(assocmem);
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if (enc)
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ret = skcipher_walk_aead_encrypt(&walk, req, false);
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else
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ret = skcipher_walk_aead_decrypt(&walk, req, false);
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if (ret)
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return ret;
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while (walk.nbytes > 0 && ret == 0) {
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vsx_begin();
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if (enc)
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aes_p10_gcm_encrypt(walk.src.virt.addr,
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walk.dst.virt.addr,
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walk.nbytes,
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&ctx->enc_key, gctx->iv, hash->Htable);
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else
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aes_p10_gcm_decrypt(walk.src.virt.addr,
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walk.dst.virt.addr,
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walk.nbytes,
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&ctx->enc_key, gctx->iv, hash->Htable);
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vsx_end();
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total_processed += walk.nbytes;
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ret = skcipher_walk_done(&walk, 0);
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}
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if (ret)
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return ret;
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/* Finalize hash */
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vsx_begin();
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finish_tag(gctx, hash, total_processed);
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vsx_end();
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/* copy Xi to end of dst */
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if (enc)
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scatterwalk_map_and_copy(hash->Htable, req->dst, req->assoclen + cryptlen,
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auth_tag_len, 1);
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else {
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scatterwalk_map_and_copy(otag, req->src,
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req->assoclen + cryptlen - auth_tag_len,
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auth_tag_len, 0);
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if (crypto_memneq(otag, hash->Htable, auth_tag_len)) {
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memzero_explicit(hash->Htable, 16);
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return -EBADMSG;
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}
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}
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return 0;
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}
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static int p10_aes_gcm_encrypt(struct aead_request *req)
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{
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return p10_aes_gcm_crypt(req, 1);
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}
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static int p10_aes_gcm_decrypt(struct aead_request *req)
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{
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return p10_aes_gcm_crypt(req, 0);
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}
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static struct aead_alg gcm_aes_alg = {
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.ivsize = GCM_IV_SIZE,
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.maxauthsize = 16,
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.setauthsize = set_authsize,
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.setkey = p10_aes_gcm_setkey,
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.encrypt = p10_aes_gcm_encrypt,
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.decrypt = p10_aes_gcm_decrypt,
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.base.cra_name = "gcm(aes)",
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.base.cra_driver_name = "aes_gcm_p10",
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.base.cra_priority = 2100,
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.base.cra_blocksize = 1,
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.base.cra_ctxsize = sizeof(struct p10_aes_gcm_ctx),
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.base.cra_module = THIS_MODULE,
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};
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static int __init p10_init(void)
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{
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return crypto_register_aead(&gcm_aes_alg);
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}
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static void __exit p10_exit(void)
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{
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crypto_unregister_aead(&gcm_aes_alg);
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}
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module_cpu_feature_match(PPC_MODULE_FEATURE_P10, p10_init);
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module_exit(p10_exit);
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