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crypto: atmel - Forbid 2-key 3DES in FIPS mode 

This patch forbids the use of 2-key 3DES (K1 == K3) in FIPS mode.

This patch also removes the bogus CFB 3DES modes that only work
with a short 3DES key not otherwise allowed by the crypto API.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2019-04-11 16:51:00 +08:00
parent eee25da50b
commit 52ea3cd291
1 changed files with 10 additions and 93 deletions
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103
drivers/crypto/atmel-tdes.c
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@ -801,19 +801,16 @@ static int atmel_tdes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
{
struct atmel_tdes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
const char *alg_name;
u32 flags;
int err;
alg_name = crypto_tfm_alg_name(crypto_ablkcipher_tfm(tfm));
/*
* HW bug in cfb 3-keys mode.
*/
if (!ctx->dd->caps.has_cfb_3keys && strstr(alg_name, "cfb")
&& (keylen != 2*DES_KEY_SIZE)) {
crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
} else if ((keylen != 2*DES_KEY_SIZE) && (keylen != 3*DES_KEY_SIZE)) {
crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
flags = crypto_ablkcipher_get_flags(tfm);
err = __des3_verify_key(&flags, key);
if (unlikely(err)) {
crypto_ablkcipher_set_flags(tfm, flags);
return err;
}
memcpy(ctx->key, key, keylen);
@ -1060,7 +1057,7 @@ static struct crypto_alg tdes_algs[] = {
.cra_module = THIS_MODULE,
.cra_init = atmel_tdes_cra_init,
.cra_u.ablkcipher = {
.min_keysize = 2 * DES_KEY_SIZE,
.min_keysize = 3 * DES_KEY_SIZE,
.max_keysize = 3 * DES_KEY_SIZE,
.setkey = atmel_tdes_setkey,
.encrypt = atmel_tdes_ecb_encrypt,
@ -1079,7 +1076,7 @@ static struct crypto_alg tdes_algs[] = {
.cra_module = THIS_MODULE,
.cra_init = atmel_tdes_cra_init,
.cra_u.ablkcipher = {
.min_keysize = 2*DES_KEY_SIZE,
.min_keysize = 3*DES_KEY_SIZE,
.max_keysize = 3*DES_KEY_SIZE,
.ivsize = DES_BLOCK_SIZE,
.setkey = atmel_tdes_setkey,
@ -1087,86 +1084,6 @@ static struct crypto_alg tdes_algs[] = {
.decrypt = atmel_tdes_cbc_decrypt,
}
},
{
.cra_name = "cfb(des3_ede)",
.cra_driver_name = "atmel-cfb-tdes",
.cra_priority = 100,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
.cra_blocksize = DES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct atmel_tdes_ctx),
.cra_alignmask = 0x7,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = atmel_tdes_cra_init,
.cra_u.ablkcipher = {
.min_keysize = 2*DES_KEY_SIZE,
.max_keysize = 2*DES_KEY_SIZE,
.ivsize = DES_BLOCK_SIZE,
.setkey = atmel_tdes_setkey,
.encrypt = atmel_tdes_cfb_encrypt,
.decrypt = atmel_tdes_cfb_decrypt,
}
},
{
.cra_name = "cfb8(des3_ede)",
.cra_driver_name = "atmel-cfb8-tdes",
.cra_priority = 100,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
.cra_blocksize = CFB8_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct atmel_tdes_ctx),
.cra_alignmask = 0,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = atmel_tdes_cra_init,
.cra_u.ablkcipher = {
.min_keysize = 2*DES_KEY_SIZE,
.max_keysize = 2*DES_KEY_SIZE,
.ivsize = DES_BLOCK_SIZE,
.setkey = atmel_tdes_setkey,
.encrypt = atmel_tdes_cfb8_encrypt,
.decrypt = atmel_tdes_cfb8_decrypt,
}
},
{
.cra_name = "cfb16(des3_ede)",
.cra_driver_name = "atmel-cfb16-tdes",
.cra_priority = 100,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
.cra_blocksize = CFB16_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct atmel_tdes_ctx),
.cra_alignmask = 0x1,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = atmel_tdes_cra_init,
.cra_u.ablkcipher = {
.min_keysize = 2*DES_KEY_SIZE,
.max_keysize = 2*DES_KEY_SIZE,
.ivsize = DES_BLOCK_SIZE,
.setkey = atmel_tdes_setkey,
.encrypt = atmel_tdes_cfb16_encrypt,
.decrypt = atmel_tdes_cfb16_decrypt,
}
},
{
.cra_name = "cfb32(des3_ede)",
.cra_driver_name = "atmel-cfb32-tdes",
.cra_priority = 100,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
.cra_blocksize = CFB32_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct atmel_tdes_ctx),
.cra_alignmask = 0x3,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = atmel_tdes_cra_init,
.cra_u.ablkcipher = {
.min_keysize = 2*DES_KEY_SIZE,
.max_keysize = 2*DES_KEY_SIZE,
.ivsize = DES_BLOCK_SIZE,
.setkey = atmel_tdes_setkey,
.encrypt = atmel_tdes_cfb32_encrypt,
.decrypt = atmel_tdes_cfb32_decrypt,
}
},
{
.cra_name = "ofb(des3_ede)",
.cra_driver_name = "atmel-ofb-tdes",
@ -1179,7 +1096,7 @@ static struct crypto_alg tdes_algs[] = {
.cra_module = THIS_MODULE,
.cra_init = atmel_tdes_cra_init,
.cra_u.ablkcipher = {
.min_keysize = 2*DES_KEY_SIZE,
.min_keysize = 3*DES_KEY_SIZE,
.max_keysize = 3*DES_KEY_SIZE,
.ivsize = DES_BLOCK_SIZE,
.setkey = atmel_tdes_setkey,