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s390/crypto: Enhance paes cipher to accept variable length key material 

Enhance the paes_s390 kernel module to allow the paes cipher to
accept variable length key material. The key material accepted by
the paes cipher is a key blob of various types. As of today, two
key blob types are supported: CCA secure key blobs and protected
key blobs.

Signed-off-by: Ingo Franzki <ifranzki@linux.ibm.com>
Reviewed-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Hendrik Brueckner <brueckner@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Ingo Franzki 2018-08-27 10:40:10 +02:00 committed by Martin Schwidefsky
parent fb1136d658
commit 52a34b34d4
1 changed files with 37 additions and 26 deletions
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63
arch/s390/crypto/paes_s390.c
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@ -30,26 +30,31 @@ static DEFINE_SPINLOCK(ctrblk_lock);
static cpacf_mask_t km_functions, kmc_functions, kmctr_functions;
struct key_blob {
__u8 key[MAXKEYBLOBSIZE];
unsigned int keylen;
};
struct s390_paes_ctx {
struct pkey_seckey sk;
struct key_blob kb;
struct pkey_protkey pk;
unsigned long fc;
};
struct s390_pxts_ctx {
struct pkey_seckey sk[2];
struct key_blob kb[2];
struct pkey_protkey pk[2];
unsigned long fc;
};
static inline int __paes_convert_key(struct pkey_seckey *sk,
static inline int __paes_convert_key(struct key_blob *kb,
struct pkey_protkey *pk)
{
int i, ret;
/* try three times in case of failure */
for (i = 0; i < 3; i++) {
ret = pkey_skey2pkey(sk, pk);
ret = pkey_keyblob2pkey(kb->key, kb->keylen, pk);
if (ret == 0)
break;
}
@ -61,7 +66,7 @@ static int __paes_set_key(struct s390_paes_ctx *ctx)
{
unsigned long fc;
if (__paes_convert_key(&ctx->sk, &ctx->pk))
if (__paes_convert_key(&ctx->kb, &ctx->pk))
return -EINVAL;
/* Pick the correct function code based on the protected key type */
@ -80,10 +85,8 @@ static int ecb_paes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
{
struct s390_paes_ctx *ctx = crypto_tfm_ctx(tfm);
if (key_len != SECKEYBLOBSIZE)
return -EINVAL;
memcpy(ctx->sk.seckey, in_key, SECKEYBLOBSIZE);
memcpy(ctx->kb.key, in_key, key_len);
ctx->kb.keylen = key_len;
if (__paes_set_key(ctx)) {
tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
return -EINVAL;
@ -147,8 +150,8 @@ static struct crypto_alg ecb_paes_alg = {
.cra_list = LIST_HEAD_INIT(ecb_paes_alg.cra_list),
.cra_u = {
.blkcipher = {
.min_keysize = SECKEYBLOBSIZE,
.max_keysize = SECKEYBLOBSIZE,
.min_keysize = MINKEYBLOBSIZE,
.max_keysize = MAXKEYBLOBSIZE,
.setkey = ecb_paes_set_key,
.encrypt = ecb_paes_encrypt,
.decrypt = ecb_paes_decrypt,
@ -160,7 +163,7 @@ static int __cbc_paes_set_key(struct s390_paes_ctx *ctx)
{
unsigned long fc;
if (__paes_convert_key(&ctx->sk, &ctx->pk))
if (__paes_convert_key(&ctx->kb, &ctx->pk))
return -EINVAL;
/* Pick the correct function code based on the protected key type */
@ -179,7 +182,8 @@ static int cbc_paes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
{
struct s390_paes_ctx *ctx = crypto_tfm_ctx(tfm);
memcpy(ctx->sk.seckey, in_key, SECKEYBLOBSIZE);
memcpy(ctx->kb.key, in_key, key_len);
ctx->kb.keylen = key_len;
if (__cbc_paes_set_key(ctx)) {
tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
return -EINVAL;
@ -250,8 +254,8 @@ static struct crypto_alg cbc_paes_alg = {
.cra_list = LIST_HEAD_INIT(cbc_paes_alg.cra_list),
.cra_u = {
.blkcipher = {
.min_keysize = SECKEYBLOBSIZE,
.max_keysize = SECKEYBLOBSIZE,
.min_keysize = MINKEYBLOBSIZE,
.max_keysize = MAXKEYBLOBSIZE,
.ivsize = AES_BLOCK_SIZE,
.setkey = cbc_paes_set_key,
.encrypt = cbc_paes_encrypt,
@ -264,8 +268,8 @@ static int __xts_paes_set_key(struct s390_pxts_ctx *ctx)
{
unsigned long fc;
if (__paes_convert_key(&ctx->sk[0], &ctx->pk[0]) ||
__paes_convert_key(&ctx->sk[1], &ctx->pk[1]))
if (__paes_convert_key(&ctx->kb[0], &ctx->pk[0]) ||
__paes_convert_key(&ctx->kb[1], &ctx->pk[1]))
return -EINVAL;
if (ctx->pk[0].type != ctx->pk[1].type)
@ -287,10 +291,16 @@ static int xts_paes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
{
struct s390_pxts_ctx *ctx = crypto_tfm_ctx(tfm);
u8 ckey[2 * AES_MAX_KEY_SIZE];
unsigned int ckey_len;
unsigned int ckey_len, keytok_len;
memcpy(ctx->sk[0].seckey, in_key, SECKEYBLOBSIZE);
memcpy(ctx->sk[1].seckey, in_key + SECKEYBLOBSIZE, SECKEYBLOBSIZE);
if (key_len % 2)
return -EINVAL;
keytok_len = key_len / 2;
memcpy(ctx->kb[0].key, in_key, keytok_len);
ctx->kb[0].keylen = keytok_len;
memcpy(ctx->kb[1].key, in_key + keytok_len, keytok_len);
ctx->kb[1].keylen = keytok_len;
if (__xts_paes_set_key(ctx)) {
tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
return -EINVAL;
@ -386,8 +396,8 @@ static struct crypto_alg xts_paes_alg = {
.cra_list = LIST_HEAD_INIT(xts_paes_alg.cra_list),
.cra_u = {
.blkcipher = {
.min_keysize = 2 * SECKEYBLOBSIZE,
.max_keysize = 2 * SECKEYBLOBSIZE,
.min_keysize = 2 * MINKEYBLOBSIZE,
.max_keysize = 2 * MAXKEYBLOBSIZE,
.ivsize = AES_BLOCK_SIZE,
.setkey = xts_paes_set_key,
.encrypt = xts_paes_encrypt,
@ -400,7 +410,7 @@ static int __ctr_paes_set_key(struct s390_paes_ctx *ctx)
{
unsigned long fc;
if (__paes_convert_key(&ctx->sk, &ctx->pk))
if (__paes_convert_key(&ctx->kb, &ctx->pk))
return -EINVAL;
/* Pick the correct function code based on the protected key type */
@ -420,7 +430,8 @@ static int ctr_paes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
{
struct s390_paes_ctx *ctx = crypto_tfm_ctx(tfm);
memcpy(ctx->sk.seckey, in_key, key_len);
memcpy(ctx->kb.key, in_key, key_len);
ctx->kb.keylen = key_len;
if (__ctr_paes_set_key(ctx)) {
tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
return -EINVAL;
@ -532,8 +543,8 @@ static struct crypto_alg ctr_paes_alg = {
.cra_list = LIST_HEAD_INIT(ctr_paes_alg.cra_list),
.cra_u = {
.blkcipher = {
.min_keysize = SECKEYBLOBSIZE,
.max_keysize = SECKEYBLOBSIZE,
.min_keysize = MINKEYBLOBSIZE,
.max_keysize = MAXKEYBLOBSIZE,
.ivsize = AES_BLOCK_SIZE,
.setkey = ctr_paes_set_key,
.encrypt = ctr_paes_encrypt,