s390/crypto: add s390 platform specific aes gcm support.
This patch introduces gcm(aes) support into the aes_s390 kernel module. Signed-off-by: Patrick Steuer <patrick.steuer@de.ibm.com> Signed-off-by: Harald Freudenberger <freude@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Harald Freudenberger
Martin Schwidefsky
Родитель
eecd49c462
Коммит
bf7fa03870
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@ -4,9 +4,11 @@
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* s390 implementation of the AES Cipher Algorithm.
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*
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* s390 Version:
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* Copyright IBM Corp. 2005, 2007
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* Copyright IBM Corp. 2005, 2017
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* Author(s): Jan Glauber (jang@de.ibm.com)
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* Sebastian Siewior (sebastian@breakpoint.cc> SW-Fallback
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* Patrick Steuer <patrick.steuer@de.ibm.com>
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* Harald Freudenberger <freude@de.ibm.com>
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*
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* Derived from "crypto/aes_generic.c"
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*
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@ -22,20 +24,25 @@
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#include <crypto/aes.h>
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#include <crypto/algapi.h>
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#include <crypto/ghash.h>
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#include <crypto/internal/aead.h>
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#include <crypto/internal/skcipher.h>
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#include <crypto/scatterwalk.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/cpufeature.h>
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#include <linux/init.h>
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#include <linux/spinlock.h>
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#include <linux/fips.h>
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#include <linux/string.h>
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#include <crypto/xts.h>
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#include <asm/cpacf.h>
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static u8 *ctrblk;
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static DEFINE_SPINLOCK(ctrblk_lock);
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static cpacf_mask_t km_functions, kmc_functions, kmctr_functions;
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static cpacf_mask_t km_functions, kmc_functions, kmctr_functions,
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kma_functions;
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struct s390_aes_ctx {
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u8 key[AES_MAX_KEY_SIZE];
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@ -55,6 +62,17 @@ struct s390_xts_ctx {
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struct crypto_skcipher *fallback;
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};
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struct gcm_sg_walk {
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struct scatter_walk walk;
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unsigned int walk_bytes;
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u8 *walk_ptr;
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unsigned int walk_bytes_remain;
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u8 buf[AES_BLOCK_SIZE];
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unsigned int buf_bytes;
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u8 *ptr;
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unsigned int nbytes;
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};
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static int setkey_fallback_cip(struct crypto_tfm *tfm, const u8 *in_key,
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unsigned int key_len)
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{
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@ -771,6 +789,267 @@ static struct crypto_alg ctr_aes_alg = {
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}
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};
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static int gcm_aes_setkey(struct crypto_aead *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct s390_aes_ctx *ctx = crypto_aead_ctx(tfm);
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switch (keylen) {
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case AES_KEYSIZE_128:
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ctx->fc = CPACF_KMA_GCM_AES_128;
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break;
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case AES_KEYSIZE_192:
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ctx->fc = CPACF_KMA_GCM_AES_192;
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break;
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case AES_KEYSIZE_256:
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ctx->fc = CPACF_KMA_GCM_AES_256;
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break;
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default:
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return -EINVAL;
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}
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memcpy(ctx->key, key, keylen);
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ctx->key_len = keylen;
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return 0;
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}
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static int gcm_aes_setauthsize(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 void gcm_sg_walk_start(struct gcm_sg_walk *gw, struct scatterlist *sg,
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unsigned int len)
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{
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memset(gw, 0, sizeof(*gw));
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gw->walk_bytes_remain = len;
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scatterwalk_start(&gw->walk, sg);
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}
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static int gcm_sg_walk_go(struct gcm_sg_walk *gw, unsigned int minbytesneeded)
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{
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int n;
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/* minbytesneeded <= AES_BLOCK_SIZE */
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if (gw->buf_bytes && gw->buf_bytes >= minbytesneeded) {
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gw->ptr = gw->buf;
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gw->nbytes = gw->buf_bytes;
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goto out;
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}
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if (gw->walk_bytes_remain == 0) {
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gw->ptr = NULL;
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gw->nbytes = 0;
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goto out;
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}
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gw->walk_bytes = scatterwalk_clamp(&gw->walk, gw->walk_bytes_remain);
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if (!gw->walk_bytes) {
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scatterwalk_start(&gw->walk, sg_next(gw->walk.sg));
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gw->walk_bytes = scatterwalk_clamp(&gw->walk,
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gw->walk_bytes_remain);
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}
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gw->walk_ptr = scatterwalk_map(&gw->walk);
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if (!gw->buf_bytes && gw->walk_bytes >= minbytesneeded) {
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gw->ptr = gw->walk_ptr;
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gw->nbytes = gw->walk_bytes;
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goto out;
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}
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while (1) {
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n = min(gw->walk_bytes, AES_BLOCK_SIZE - gw->buf_bytes);
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memcpy(gw->buf + gw->buf_bytes, gw->walk_ptr, n);
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gw->buf_bytes += n;
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gw->walk_bytes_remain -= n;
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scatterwalk_unmap(&gw->walk);
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scatterwalk_advance(&gw->walk, n);
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scatterwalk_done(&gw->walk, 0, gw->walk_bytes_remain);
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if (gw->buf_bytes >= minbytesneeded) {
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gw->ptr = gw->buf;
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gw->nbytes = gw->buf_bytes;
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goto out;
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}
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gw->walk_bytes = scatterwalk_clamp(&gw->walk,
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gw->walk_bytes_remain);
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if (!gw->walk_bytes) {
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scatterwalk_start(&gw->walk, sg_next(gw->walk.sg));
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gw->walk_bytes = scatterwalk_clamp(&gw->walk,
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gw->walk_bytes_remain);
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}
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gw->walk_ptr = scatterwalk_map(&gw->walk);
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}
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out:
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return gw->nbytes;
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}
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static void gcm_sg_walk_done(struct gcm_sg_walk *gw, unsigned int bytesdone)
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{
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int n;
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if (gw->ptr == NULL)
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return;
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if (gw->ptr == gw->buf) {
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n = gw->buf_bytes - bytesdone;
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if (n > 0) {
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memmove(gw->buf, gw->buf + bytesdone, n);
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gw->buf_bytes -= n;
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} else
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gw->buf_bytes = 0;
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} else {
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gw->walk_bytes_remain -= bytesdone;
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scatterwalk_unmap(&gw->walk);
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scatterwalk_advance(&gw->walk, bytesdone);
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scatterwalk_done(&gw->walk, 0, gw->walk_bytes_remain);
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}
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}
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static int gcm_aes_crypt(struct aead_request *req, unsigned int flags)
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{
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struct crypto_aead *tfm = crypto_aead_reqtfm(req);
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struct s390_aes_ctx *ctx = crypto_aead_ctx(tfm);
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unsigned int ivsize = crypto_aead_ivsize(tfm);
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unsigned int taglen = crypto_aead_authsize(tfm);
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unsigned int aadlen = req->assoclen;
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unsigned int pclen = req->cryptlen;
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int ret = 0;
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unsigned int len, in_bytes, out_bytes,
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min_bytes, bytes, aad_bytes, pc_bytes;
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struct gcm_sg_walk gw_in, gw_out;
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u8 tag[GHASH_DIGEST_SIZE];
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struct {
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u32 _[3]; /* reserved */
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u32 cv; /* Counter Value */
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u8 t[GHASH_DIGEST_SIZE];/* Tag */
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u8 h[AES_BLOCK_SIZE]; /* Hash-subkey */
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u64 taadl; /* Total AAD Length */
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u64 tpcl; /* Total Plain-/Cipher-text Length */
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u8 j0[GHASH_BLOCK_SIZE];/* initial counter value */
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u8 k[AES_MAX_KEY_SIZE]; /* Key */
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} param;
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/*
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* encrypt
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* req->src: aad||plaintext
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* req->dst: aad||ciphertext||tag
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* decrypt
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* req->src: aad||ciphertext||tag
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* req->dst: aad||plaintext, return 0 or -EBADMSG
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* aad, plaintext and ciphertext may be empty.
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*/
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if (flags & CPACF_DECRYPT)
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pclen -= taglen;
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len = aadlen + pclen;
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memset(¶m, 0, sizeof(param));
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param.cv = 1;
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param.taadl = aadlen * 8;
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param.tpcl = pclen * 8;
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memcpy(param.j0, req->iv, ivsize);
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*(u32 *)(param.j0 + ivsize) = 1;
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memcpy(param.k, ctx->key, ctx->key_len);
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gcm_sg_walk_start(&gw_in, req->src, len);
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gcm_sg_walk_start(&gw_out, req->dst, len);
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do {
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min_bytes = min_t(unsigned int,
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aadlen > 0 ? aadlen : pclen, AES_BLOCK_SIZE);
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in_bytes = gcm_sg_walk_go(&gw_in, min_bytes);
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out_bytes = gcm_sg_walk_go(&gw_out, min_bytes);
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bytes = min(in_bytes, out_bytes);
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if (aadlen + pclen <= bytes) {
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aad_bytes = aadlen;
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pc_bytes = pclen;
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flags |= CPACF_KMA_LAAD | CPACF_KMA_LPC;
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} else {
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if (aadlen <= bytes) {
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aad_bytes = aadlen;
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pc_bytes = (bytes - aadlen) &
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~(AES_BLOCK_SIZE - 1);
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flags |= CPACF_KMA_LAAD;
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} else {
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aad_bytes = bytes & ~(AES_BLOCK_SIZE - 1);
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pc_bytes = 0;
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}
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}
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if (aad_bytes > 0)
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memcpy(gw_out.ptr, gw_in.ptr, aad_bytes);
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cpacf_kma(ctx->fc | flags, ¶m,
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gw_out.ptr + aad_bytes,
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gw_in.ptr + aad_bytes, pc_bytes,
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gw_in.ptr, aad_bytes);
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gcm_sg_walk_done(&gw_in, aad_bytes + pc_bytes);
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gcm_sg_walk_done(&gw_out, aad_bytes + pc_bytes);
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aadlen -= aad_bytes;
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pclen -= pc_bytes;
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} while (aadlen + pclen > 0);
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if (flags & CPACF_DECRYPT) {
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scatterwalk_map_and_copy(tag, req->src, len, taglen, 0);
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if (crypto_memneq(tag, param.t, taglen))
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ret = -EBADMSG;
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} else
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scatterwalk_map_and_copy(param.t, req->dst, len, taglen, 1);
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memzero_explicit(¶m, sizeof(param));
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return ret;
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}
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static int gcm_aes_encrypt(struct aead_request *req)
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{
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return gcm_aes_crypt(req, CPACF_ENCRYPT);
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}
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static int gcm_aes_decrypt(struct aead_request *req)
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{
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return gcm_aes_crypt(req, CPACF_DECRYPT);
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}
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static struct aead_alg gcm_aes_aead = {
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.setkey = gcm_aes_setkey,
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.setauthsize = gcm_aes_setauthsize,
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.encrypt = gcm_aes_encrypt,
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.decrypt = gcm_aes_decrypt,
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.ivsize = GHASH_BLOCK_SIZE - sizeof(u32),
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.maxauthsize = GHASH_DIGEST_SIZE,
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.chunksize = AES_BLOCK_SIZE,
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.base = {
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.cra_flags = CRYPTO_ALG_TYPE_AEAD,
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.cra_blocksize = 1,
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.cra_ctxsize = sizeof(struct s390_aes_ctx),
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.cra_priority = 900,
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.cra_name = "gcm(aes)",
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.cra_driver_name = "gcm-aes-s390",
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.cra_module = THIS_MODULE,
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},
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};
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static struct crypto_alg *aes_s390_algs_ptr[5];
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static int aes_s390_algs_num;
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@ -790,16 +1069,19 @@ static void aes_s390_fini(void)
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crypto_unregister_alg(aes_s390_algs_ptr[aes_s390_algs_num]);
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if (ctrblk)
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free_page((unsigned long) ctrblk);
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crypto_unregister_aead(&gcm_aes_aead);
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}
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static int __init aes_s390_init(void)
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{
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int ret;
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/* Query available functions for KM, KMC and KMCTR */
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/* Query available functions for KM, KMC, KMCTR and KMA */
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cpacf_query(CPACF_KM, &km_functions);
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cpacf_query(CPACF_KMC, &kmc_functions);
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cpacf_query(CPACF_KMCTR, &kmctr_functions);
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cpacf_query(CPACF_KMA, &kma_functions);
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if (cpacf_test_func(&km_functions, CPACF_KM_AES_128) ||
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cpacf_test_func(&km_functions, CPACF_KM_AES_192) ||
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@ -840,6 +1122,14 @@ static int __init aes_s390_init(void)
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goto out_err;
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}
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if (cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_128) ||
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cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_192) ||
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cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_256)) {
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ret = crypto_register_aead(&gcm_aes_aead);
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if (ret)
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goto out_err;
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}
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return 0;
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out_err:
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aes_s390_fini();
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