503 lines
13 KiB
C
503 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Cryptographic API.
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*
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* s390 implementation of the DES Cipher Algorithm.
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*
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* Copyright IBM Corp. 2003, 2011
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* Author(s): Thomas Spatzier
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* Jan Glauber (jan.glauber@de.ibm.com)
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/cpufeature.h>
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#include <linux/crypto.h>
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#include <linux/fips.h>
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#include <linux/mutex.h>
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#include <crypto/algapi.h>
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#include <crypto/internal/des.h>
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#include <crypto/internal/skcipher.h>
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#include <asm/cpacf.h>
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#define DES3_KEY_SIZE (3 * DES_KEY_SIZE)
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static u8 *ctrblk;
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static DEFINE_MUTEX(ctrblk_lock);
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static cpacf_mask_t km_functions, kmc_functions, kmctr_functions;
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struct s390_des_ctx {
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u8 iv[DES_BLOCK_SIZE];
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u8 key[DES3_KEY_SIZE];
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};
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static int des_setkey(struct crypto_tfm *tfm, const u8 *key,
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unsigned int key_len)
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{
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struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
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int err;
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err = crypto_des_verify_key(tfm, key);
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if (err)
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return err;
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memcpy(ctx->key, key, key_len);
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return 0;
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}
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static int des_setkey_skcipher(struct crypto_skcipher *tfm, const u8 *key,
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unsigned int key_len)
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{
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return des_setkey(crypto_skcipher_tfm(tfm), key, key_len);
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}
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static void s390_des_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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{
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struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
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cpacf_km(CPACF_KM_DEA, ctx->key, out, in, DES_BLOCK_SIZE);
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}
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static void s390_des_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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{
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struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
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cpacf_km(CPACF_KM_DEA | CPACF_DECRYPT,
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ctx->key, out, in, DES_BLOCK_SIZE);
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}
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static struct crypto_alg des_alg = {
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.cra_name = "des",
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.cra_driver_name = "des-s390",
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.cra_priority = 300,
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.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
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.cra_blocksize = DES_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct s390_des_ctx),
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.cra_module = THIS_MODULE,
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.cra_u = {
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.cipher = {
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.cia_min_keysize = DES_KEY_SIZE,
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.cia_max_keysize = DES_KEY_SIZE,
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.cia_setkey = des_setkey,
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.cia_encrypt = s390_des_encrypt,
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.cia_decrypt = s390_des_decrypt,
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}
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}
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};
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static int ecb_desall_crypt(struct skcipher_request *req, unsigned long fc)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct s390_des_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct skcipher_walk walk;
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unsigned int nbytes, n;
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int ret;
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ret = skcipher_walk_virt(&walk, req, false);
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while ((nbytes = walk.nbytes) != 0) {
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/* only use complete blocks */
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n = nbytes & ~(DES_BLOCK_SIZE - 1);
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cpacf_km(fc, ctx->key, walk.dst.virt.addr,
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walk.src.virt.addr, n);
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ret = skcipher_walk_done(&walk, nbytes - n);
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}
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return ret;
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}
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static int cbc_desall_crypt(struct skcipher_request *req, unsigned long fc)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct s390_des_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct skcipher_walk walk;
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unsigned int nbytes, n;
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int ret;
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struct {
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u8 iv[DES_BLOCK_SIZE];
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u8 key[DES3_KEY_SIZE];
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} param;
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ret = skcipher_walk_virt(&walk, req, false);
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if (ret)
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return ret;
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memcpy(param.iv, walk.iv, DES_BLOCK_SIZE);
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memcpy(param.key, ctx->key, DES3_KEY_SIZE);
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while ((nbytes = walk.nbytes) != 0) {
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/* only use complete blocks */
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n = nbytes & ~(DES_BLOCK_SIZE - 1);
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cpacf_kmc(fc, ¶m, walk.dst.virt.addr,
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walk.src.virt.addr, n);
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memcpy(walk.iv, param.iv, DES_BLOCK_SIZE);
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ret = skcipher_walk_done(&walk, nbytes - n);
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}
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return ret;
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}
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static int ecb_des_encrypt(struct skcipher_request *req)
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{
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return ecb_desall_crypt(req, CPACF_KM_DEA);
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}
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static int ecb_des_decrypt(struct skcipher_request *req)
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{
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return ecb_desall_crypt(req, CPACF_KM_DEA | CPACF_DECRYPT);
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}
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static struct skcipher_alg ecb_des_alg = {
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.base.cra_name = "ecb(des)",
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.base.cra_driver_name = "ecb-des-s390",
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.base.cra_priority = 400, /* combo: des + ecb */
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.base.cra_blocksize = DES_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct s390_des_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = DES_KEY_SIZE,
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.max_keysize = DES_KEY_SIZE,
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.setkey = des_setkey_skcipher,
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.encrypt = ecb_des_encrypt,
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.decrypt = ecb_des_decrypt,
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};
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static int cbc_des_encrypt(struct skcipher_request *req)
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{
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return cbc_desall_crypt(req, CPACF_KMC_DEA);
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}
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static int cbc_des_decrypt(struct skcipher_request *req)
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{
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return cbc_desall_crypt(req, CPACF_KMC_DEA | CPACF_DECRYPT);
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}
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static struct skcipher_alg cbc_des_alg = {
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.base.cra_name = "cbc(des)",
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.base.cra_driver_name = "cbc-des-s390",
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.base.cra_priority = 400, /* combo: des + cbc */
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.base.cra_blocksize = DES_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct s390_des_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = DES_KEY_SIZE,
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.max_keysize = DES_KEY_SIZE,
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.ivsize = DES_BLOCK_SIZE,
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.setkey = des_setkey_skcipher,
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.encrypt = cbc_des_encrypt,
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.decrypt = cbc_des_decrypt,
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};
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/*
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* RFC2451:
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*
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* For DES-EDE3, there is no known need to reject weak or
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* complementation keys. Any weakness is obviated by the use of
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* multiple keys.
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*
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* However, if the first two or last two independent 64-bit keys are
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* equal (k1 == k2 or k2 == k3), then the DES3 operation is simply the
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* same as DES. Implementers MUST reject keys that exhibit this
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* property.
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*
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* In fips mode additionally check for all 3 keys are unique.
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*
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*/
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static int des3_setkey(struct crypto_tfm *tfm, const u8 *key,
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unsigned int key_len)
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{
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struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
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int err;
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err = crypto_des3_ede_verify_key(tfm, key);
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if (err)
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return err;
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memcpy(ctx->key, key, key_len);
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return 0;
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}
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static int des3_setkey_skcipher(struct crypto_skcipher *tfm, const u8 *key,
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unsigned int key_len)
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{
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return des3_setkey(crypto_skcipher_tfm(tfm), key, key_len);
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}
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static void des3_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
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{
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struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
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cpacf_km(CPACF_KM_TDEA_192, ctx->key, dst, src, DES_BLOCK_SIZE);
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}
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static void des3_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
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{
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struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
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cpacf_km(CPACF_KM_TDEA_192 | CPACF_DECRYPT,
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ctx->key, dst, src, DES_BLOCK_SIZE);
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}
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static struct crypto_alg des3_alg = {
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.cra_name = "des3_ede",
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.cra_driver_name = "des3_ede-s390",
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.cra_priority = 300,
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.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
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.cra_blocksize = DES_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct s390_des_ctx),
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.cra_module = THIS_MODULE,
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.cra_u = {
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.cipher = {
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.cia_min_keysize = DES3_KEY_SIZE,
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.cia_max_keysize = DES3_KEY_SIZE,
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.cia_setkey = des3_setkey,
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.cia_encrypt = des3_encrypt,
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.cia_decrypt = des3_decrypt,
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}
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}
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};
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static int ecb_des3_encrypt(struct skcipher_request *req)
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{
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return ecb_desall_crypt(req, CPACF_KM_TDEA_192);
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}
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static int ecb_des3_decrypt(struct skcipher_request *req)
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{
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return ecb_desall_crypt(req, CPACF_KM_TDEA_192 | CPACF_DECRYPT);
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}
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static struct skcipher_alg ecb_des3_alg = {
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.base.cra_name = "ecb(des3_ede)",
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.base.cra_driver_name = "ecb-des3_ede-s390",
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.base.cra_priority = 400, /* combo: des3 + ecb */
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.base.cra_blocksize = DES_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct s390_des_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = DES3_KEY_SIZE,
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.max_keysize = DES3_KEY_SIZE,
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.setkey = des3_setkey_skcipher,
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.encrypt = ecb_des3_encrypt,
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.decrypt = ecb_des3_decrypt,
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};
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static int cbc_des3_encrypt(struct skcipher_request *req)
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{
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return cbc_desall_crypt(req, CPACF_KMC_TDEA_192);
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}
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static int cbc_des3_decrypt(struct skcipher_request *req)
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{
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return cbc_desall_crypt(req, CPACF_KMC_TDEA_192 | CPACF_DECRYPT);
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}
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static struct skcipher_alg cbc_des3_alg = {
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.base.cra_name = "cbc(des3_ede)",
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.base.cra_driver_name = "cbc-des3_ede-s390",
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.base.cra_priority = 400, /* combo: des3 + cbc */
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.base.cra_blocksize = DES_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct s390_des_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = DES3_KEY_SIZE,
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.max_keysize = DES3_KEY_SIZE,
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.ivsize = DES_BLOCK_SIZE,
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.setkey = des3_setkey_skcipher,
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.encrypt = cbc_des3_encrypt,
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.decrypt = cbc_des3_decrypt,
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};
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static unsigned int __ctrblk_init(u8 *ctrptr, u8 *iv, unsigned int nbytes)
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{
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unsigned int i, n;
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/* align to block size, max. PAGE_SIZE */
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n = (nbytes > PAGE_SIZE) ? PAGE_SIZE : nbytes & ~(DES_BLOCK_SIZE - 1);
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memcpy(ctrptr, iv, DES_BLOCK_SIZE);
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for (i = (n / DES_BLOCK_SIZE) - 1; i > 0; i--) {
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memcpy(ctrptr + DES_BLOCK_SIZE, ctrptr, DES_BLOCK_SIZE);
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crypto_inc(ctrptr + DES_BLOCK_SIZE, DES_BLOCK_SIZE);
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ctrptr += DES_BLOCK_SIZE;
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}
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return n;
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}
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static int ctr_desall_crypt(struct skcipher_request *req, unsigned long fc)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct s390_des_ctx *ctx = crypto_skcipher_ctx(tfm);
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u8 buf[DES_BLOCK_SIZE], *ctrptr;
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struct skcipher_walk walk;
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unsigned int n, nbytes;
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int ret, locked;
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locked = mutex_trylock(&ctrblk_lock);
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ret = skcipher_walk_virt(&walk, req, false);
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while ((nbytes = walk.nbytes) >= DES_BLOCK_SIZE) {
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n = DES_BLOCK_SIZE;
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if (nbytes >= 2*DES_BLOCK_SIZE && locked)
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n = __ctrblk_init(ctrblk, walk.iv, nbytes);
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ctrptr = (n > DES_BLOCK_SIZE) ? ctrblk : walk.iv;
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cpacf_kmctr(fc, ctx->key, walk.dst.virt.addr,
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walk.src.virt.addr, n, ctrptr);
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if (ctrptr == ctrblk)
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memcpy(walk.iv, ctrptr + n - DES_BLOCK_SIZE,
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DES_BLOCK_SIZE);
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crypto_inc(walk.iv, DES_BLOCK_SIZE);
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ret = skcipher_walk_done(&walk, nbytes - n);
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}
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if (locked)
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mutex_unlock(&ctrblk_lock);
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/* final block may be < DES_BLOCK_SIZE, copy only nbytes */
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if (nbytes) {
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cpacf_kmctr(fc, ctx->key, buf, walk.src.virt.addr,
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DES_BLOCK_SIZE, walk.iv);
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memcpy(walk.dst.virt.addr, buf, nbytes);
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crypto_inc(walk.iv, DES_BLOCK_SIZE);
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ret = skcipher_walk_done(&walk, 0);
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}
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return ret;
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}
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static int ctr_des_crypt(struct skcipher_request *req)
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{
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return ctr_desall_crypt(req, CPACF_KMCTR_DEA);
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}
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static struct skcipher_alg ctr_des_alg = {
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.base.cra_name = "ctr(des)",
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.base.cra_driver_name = "ctr-des-s390",
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.base.cra_priority = 400, /* combo: des + ctr */
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.base.cra_blocksize = 1,
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.base.cra_ctxsize = sizeof(struct s390_des_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = DES_KEY_SIZE,
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.max_keysize = DES_KEY_SIZE,
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.ivsize = DES_BLOCK_SIZE,
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.setkey = des_setkey_skcipher,
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.encrypt = ctr_des_crypt,
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.decrypt = ctr_des_crypt,
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.chunksize = DES_BLOCK_SIZE,
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};
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static int ctr_des3_crypt(struct skcipher_request *req)
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{
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return ctr_desall_crypt(req, CPACF_KMCTR_TDEA_192);
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}
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static struct skcipher_alg ctr_des3_alg = {
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.base.cra_name = "ctr(des3_ede)",
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.base.cra_driver_name = "ctr-des3_ede-s390",
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.base.cra_priority = 400, /* combo: des3 + ede */
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.base.cra_blocksize = 1,
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.base.cra_ctxsize = sizeof(struct s390_des_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = DES3_KEY_SIZE,
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.max_keysize = DES3_KEY_SIZE,
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.ivsize = DES_BLOCK_SIZE,
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.setkey = des3_setkey_skcipher,
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.encrypt = ctr_des3_crypt,
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.decrypt = ctr_des3_crypt,
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.chunksize = DES_BLOCK_SIZE,
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};
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static struct crypto_alg *des_s390_algs_ptr[2];
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static int des_s390_algs_num;
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static struct skcipher_alg *des_s390_skciphers_ptr[6];
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static int des_s390_skciphers_num;
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static int des_s390_register_alg(struct crypto_alg *alg)
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{
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int ret;
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ret = crypto_register_alg(alg);
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if (!ret)
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des_s390_algs_ptr[des_s390_algs_num++] = alg;
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return ret;
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}
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static int des_s390_register_skcipher(struct skcipher_alg *alg)
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{
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int ret;
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ret = crypto_register_skcipher(alg);
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if (!ret)
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des_s390_skciphers_ptr[des_s390_skciphers_num++] = alg;
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return ret;
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}
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static void des_s390_exit(void)
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{
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while (des_s390_algs_num--)
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crypto_unregister_alg(des_s390_algs_ptr[des_s390_algs_num]);
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while (des_s390_skciphers_num--)
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crypto_unregister_skcipher(des_s390_skciphers_ptr[des_s390_skciphers_num]);
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if (ctrblk)
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free_page((unsigned long) ctrblk);
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}
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static int __init des_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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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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if (cpacf_test_func(&km_functions, CPACF_KM_DEA)) {
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ret = des_s390_register_alg(&des_alg);
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if (ret)
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goto out_err;
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ret = des_s390_register_skcipher(&ecb_des_alg);
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if (ret)
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goto out_err;
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}
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if (cpacf_test_func(&kmc_functions, CPACF_KMC_DEA)) {
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ret = des_s390_register_skcipher(&cbc_des_alg);
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if (ret)
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goto out_err;
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}
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if (cpacf_test_func(&km_functions, CPACF_KM_TDEA_192)) {
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ret = des_s390_register_alg(&des3_alg);
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if (ret)
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goto out_err;
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ret = des_s390_register_skcipher(&ecb_des3_alg);
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if (ret)
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goto out_err;
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}
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if (cpacf_test_func(&kmc_functions, CPACF_KMC_TDEA_192)) {
|
|
ret = des_s390_register_skcipher(&cbc_des3_alg);
|
|
if (ret)
|
|
goto out_err;
|
|
}
|
|
|
|
if (cpacf_test_func(&kmctr_functions, CPACF_KMCTR_DEA) ||
|
|
cpacf_test_func(&kmctr_functions, CPACF_KMCTR_TDEA_192)) {
|
|
ctrblk = (u8 *) __get_free_page(GFP_KERNEL);
|
|
if (!ctrblk) {
|
|
ret = -ENOMEM;
|
|
goto out_err;
|
|
}
|
|
}
|
|
|
|
if (cpacf_test_func(&kmctr_functions, CPACF_KMCTR_DEA)) {
|
|
ret = des_s390_register_skcipher(&ctr_des_alg);
|
|
if (ret)
|
|
goto out_err;
|
|
}
|
|
if (cpacf_test_func(&kmctr_functions, CPACF_KMCTR_TDEA_192)) {
|
|
ret = des_s390_register_skcipher(&ctr_des3_alg);
|
|
if (ret)
|
|
goto out_err;
|
|
}
|
|
|
|
return 0;
|
|
out_err:
|
|
des_s390_exit();
|
|
return ret;
|
|
}
|
|
|
|
module_cpu_feature_match(MSA, des_s390_init);
|
|
module_exit(des_s390_exit);
|
|
|
|
MODULE_ALIAS_CRYPTO("des");
|
|
MODULE_ALIAS_CRYPTO("des3_ede");
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("DES & Triple DES EDE Cipher Algorithms");
|