diff options
Diffstat (limited to 'arch/s390/crypto/des_s390.c')
| -rw-r--r-- | arch/s390/crypto/des_s390.c | 502 |
1 files changed, 502 insertions, 0 deletions
diff --git a/arch/s390/crypto/des_s390.c b/arch/s390/crypto/des_s390.c new file mode 100644 index 0000000000..8e75b83a5d --- /dev/null +++ b/arch/s390/crypto/des_s390.c @@ -0,0 +1,502 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Cryptographic API. + * + * s390 implementation of the DES Cipher Algorithm. + * + * Copyright IBM Corp. 2003, 2011 + * Author(s): Thomas Spatzier + * Jan Glauber (jan.glauber@de.ibm.com) + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/cpufeature.h> +#include <linux/crypto.h> +#include <linux/fips.h> +#include <linux/mutex.h> +#include <crypto/algapi.h> +#include <crypto/internal/des.h> +#include <crypto/internal/skcipher.h> +#include <asm/cpacf.h> + +#define DES3_KEY_SIZE (3 * DES_KEY_SIZE) + +static u8 *ctrblk; +static DEFINE_MUTEX(ctrblk_lock); + +static cpacf_mask_t km_functions, kmc_functions, kmctr_functions; + +struct s390_des_ctx { + u8 iv[DES_BLOCK_SIZE]; + u8 key[DES3_KEY_SIZE]; +}; + +static int des_setkey(struct crypto_tfm *tfm, const u8 *key, + unsigned int key_len) +{ + struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm); + int err; + + err = crypto_des_verify_key(tfm, key); + if (err) + return err; + + memcpy(ctx->key, key, key_len); + return 0; +} + +static int des_setkey_skcipher(struct crypto_skcipher *tfm, const u8 *key, + unsigned int key_len) +{ + return des_setkey(crypto_skcipher_tfm(tfm), key, key_len); +} + +static void s390_des_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) +{ + struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm); + + cpacf_km(CPACF_KM_DEA, ctx->key, out, in, DES_BLOCK_SIZE); +} + +static void s390_des_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) +{ + struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm); + + cpacf_km(CPACF_KM_DEA | CPACF_DECRYPT, + ctx->key, out, in, DES_BLOCK_SIZE); +} + +static struct crypto_alg des_alg = { + .cra_name = "des", + .cra_driver_name = "des-s390", + .cra_priority = 300, + .cra_flags = CRYPTO_ALG_TYPE_CIPHER, + .cra_blocksize = DES_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct s390_des_ctx), + .cra_module = THIS_MODULE, + .cra_u = { + .cipher = { + .cia_min_keysize = DES_KEY_SIZE, + .cia_max_keysize = DES_KEY_SIZE, + .cia_setkey = des_setkey, + .cia_encrypt = s390_des_encrypt, + .cia_decrypt = s390_des_decrypt, + } + } +}; + +static int ecb_desall_crypt(struct skcipher_request *req, unsigned long fc) +{ + struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); + struct s390_des_ctx *ctx = crypto_skcipher_ctx(tfm); + struct skcipher_walk walk; + unsigned int nbytes, n; + int ret; + + ret = skcipher_walk_virt(&walk, req, false); + while ((nbytes = walk.nbytes) != 0) { + /* only use complete blocks */ + n = nbytes & ~(DES_BLOCK_SIZE - 1); + cpacf_km(fc, ctx->key, walk.dst.virt.addr, + walk.src.virt.addr, n); + ret = skcipher_walk_done(&walk, nbytes - n); + } + return ret; +} + +static int cbc_desall_crypt(struct skcipher_request *req, unsigned long fc) +{ + struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); + struct s390_des_ctx *ctx = crypto_skcipher_ctx(tfm); + struct skcipher_walk walk; + unsigned int nbytes, n; + int ret; + struct { + u8 iv[DES_BLOCK_SIZE]; + u8 key[DES3_KEY_SIZE]; + } param; + + ret = skcipher_walk_virt(&walk, req, false); + if (ret) + return ret; + memcpy(param.iv, walk.iv, DES_BLOCK_SIZE); + memcpy(param.key, ctx->key, DES3_KEY_SIZE); + while ((nbytes = walk.nbytes) != 0) { + /* only use complete blocks */ + n = nbytes & ~(DES_BLOCK_SIZE - 1); + cpacf_kmc(fc, ¶m, walk.dst.virt.addr, + walk.src.virt.addr, n); + memcpy(walk.iv, param.iv, DES_BLOCK_SIZE); + ret = skcipher_walk_done(&walk, nbytes - n); + } + return ret; +} + +static int ecb_des_encrypt(struct skcipher_request *req) +{ + return ecb_desall_crypt(req, CPACF_KM_DEA); +} + +static int ecb_des_decrypt(struct skcipher_request *req) +{ + return ecb_desall_crypt(req, CPACF_KM_DEA | CPACF_DECRYPT); +} + +static struct skcipher_alg ecb_des_alg = { + .base.cra_name = "ecb(des)", + .base.cra_driver_name = "ecb-des-s390", + .base.cra_priority = 400, /* combo: des + ecb */ + .base.cra_blocksize = DES_BLOCK_SIZE, + .base.cra_ctxsize = sizeof(struct s390_des_ctx), + .base.cra_module = THIS_MODULE, + .min_keysize = DES_KEY_SIZE, + .max_keysize = DES_KEY_SIZE, + .setkey = des_setkey_skcipher, + .encrypt = ecb_des_encrypt, + .decrypt = ecb_des_decrypt, +}; + +static int cbc_des_encrypt(struct skcipher_request *req) +{ + return cbc_desall_crypt(req, CPACF_KMC_DEA); +} + +static int cbc_des_decrypt(struct skcipher_request *req) +{ + return cbc_desall_crypt(req, CPACF_KMC_DEA | CPACF_DECRYPT); +} + +static struct skcipher_alg cbc_des_alg = { + .base.cra_name = "cbc(des)", + .base.cra_driver_name = "cbc-des-s390", + .base.cra_priority = 400, /* combo: des + cbc */ + .base.cra_blocksize = DES_BLOCK_SIZE, + .base.cra_ctxsize = sizeof(struct s390_des_ctx), + .base.cra_module = THIS_MODULE, + .min_keysize = DES_KEY_SIZE, + .max_keysize = DES_KEY_SIZE, + .ivsize = DES_BLOCK_SIZE, + .setkey = des_setkey_skcipher, + .encrypt = cbc_des_encrypt, + .decrypt = cbc_des_decrypt, +}; + +/* + * RFC2451: + * + * For DES-EDE3, there is no known need to reject weak or + * complementation keys. Any weakness is obviated by the use of + * multiple keys. + * + * However, if the first two or last two independent 64-bit keys are + * equal (k1 == k2 or k2 == k3), then the DES3 operation is simply the + * same as DES. Implementers MUST reject keys that exhibit this + * property. + * + * In fips mode additionally check for all 3 keys are unique. + * + */ +static int des3_setkey(struct crypto_tfm *tfm, const u8 *key, + unsigned int key_len) +{ + struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm); + int err; + + err = crypto_des3_ede_verify_key(tfm, key); + if (err) + return err; + + memcpy(ctx->key, key, key_len); + return 0; +} + +static int des3_setkey_skcipher(struct crypto_skcipher *tfm, const u8 *key, + unsigned int key_len) +{ + return des3_setkey(crypto_skcipher_tfm(tfm), key, key_len); +} + +static void des3_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) +{ + struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm); + + cpacf_km(CPACF_KM_TDEA_192, ctx->key, dst, src, DES_BLOCK_SIZE); +} + +static void des3_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) +{ + struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm); + + cpacf_km(CPACF_KM_TDEA_192 | CPACF_DECRYPT, + ctx->key, dst, src, DES_BLOCK_SIZE); +} + +static struct crypto_alg des3_alg = { + .cra_name = "des3_ede", + .cra_driver_name = "des3_ede-s390", + .cra_priority = 300, + .cra_flags = CRYPTO_ALG_TYPE_CIPHER, + .cra_blocksize = DES_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct s390_des_ctx), + .cra_module = THIS_MODULE, + .cra_u = { + .cipher = { + .cia_min_keysize = DES3_KEY_SIZE, + .cia_max_keysize = DES3_KEY_SIZE, + .cia_setkey = des3_setkey, + .cia_encrypt = des3_encrypt, + .cia_decrypt = des3_decrypt, + } + } +}; + +static int ecb_des3_encrypt(struct skcipher_request *req) +{ + return ecb_desall_crypt(req, CPACF_KM_TDEA_192); +} + +static int ecb_des3_decrypt(struct skcipher_request *req) +{ + return ecb_desall_crypt(req, CPACF_KM_TDEA_192 | CPACF_DECRYPT); +} + +static struct skcipher_alg ecb_des3_alg = { + .base.cra_name = "ecb(des3_ede)", + .base.cra_driver_name = "ecb-des3_ede-s390", + .base.cra_priority = 400, /* combo: des3 + ecb */ + .base.cra_blocksize = DES_BLOCK_SIZE, + .base.cra_ctxsize = sizeof(struct s390_des_ctx), + .base.cra_module = THIS_MODULE, + .min_keysize = DES3_KEY_SIZE, + .max_keysize = DES3_KEY_SIZE, + .setkey = des3_setkey_skcipher, + .encrypt = ecb_des3_encrypt, + .decrypt = ecb_des3_decrypt, +}; + +static int cbc_des3_encrypt(struct skcipher_request *req) +{ + return cbc_desall_crypt(req, CPACF_KMC_TDEA_192); +} + +static int cbc_des3_decrypt(struct skcipher_request *req) +{ + return cbc_desall_crypt(req, CPACF_KMC_TDEA_192 | CPACF_DECRYPT); +} + +static struct skcipher_alg cbc_des3_alg = { + .base.cra_name = "cbc(des3_ede)", + .base.cra_driver_name = "cbc-des3_ede-s390", + .base.cra_priority = 400, /* combo: des3 + cbc */ + .base.cra_blocksize = DES_BLOCK_SIZE, + .base.cra_ctxsize = sizeof(struct s390_des_ctx), + .base.cra_module = THIS_MODULE, + .min_keysize = DES3_KEY_SIZE, + .max_keysize = DES3_KEY_SIZE, + .ivsize = DES_BLOCK_SIZE, + .setkey = des3_setkey_skcipher, + .encrypt = cbc_des3_encrypt, + .decrypt = cbc_des3_decrypt, +}; + +static unsigned int __ctrblk_init(u8 *ctrptr, u8 *iv, unsigned int nbytes) +{ + unsigned int i, n; + + /* align to block size, max. PAGE_SIZE */ + n = (nbytes > PAGE_SIZE) ? PAGE_SIZE : nbytes & ~(DES_BLOCK_SIZE - 1); + memcpy(ctrptr, iv, DES_BLOCK_SIZE); + for (i = (n / DES_BLOCK_SIZE) - 1; i > 0; i--) { + memcpy(ctrptr + DES_BLOCK_SIZE, ctrptr, DES_BLOCK_SIZE); + crypto_inc(ctrptr + DES_BLOCK_SIZE, DES_BLOCK_SIZE); + ctrptr += DES_BLOCK_SIZE; + } + return n; +} + +static int ctr_desall_crypt(struct skcipher_request *req, unsigned long fc) +{ + struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); + struct s390_des_ctx *ctx = crypto_skcipher_ctx(tfm); + u8 buf[DES_BLOCK_SIZE], *ctrptr; + struct skcipher_walk walk; + unsigned int n, nbytes; + int ret, locked; + + locked = mutex_trylock(&ctrblk_lock); + + ret = skcipher_walk_virt(&walk, req, false); + while ((nbytes = walk.nbytes) >= DES_BLOCK_SIZE) { + n = DES_BLOCK_SIZE; + if (nbytes >= 2*DES_BLOCK_SIZE && locked) + n = __ctrblk_init(ctrblk, walk.iv, nbytes); + ctrptr = (n > DES_BLOCK_SIZE) ? ctrblk : walk.iv; + cpacf_kmctr(fc, ctx->key, walk.dst.virt.addr, + walk.src.virt.addr, n, ctrptr); + if (ctrptr == ctrblk) + memcpy(walk.iv, ctrptr + n - DES_BLOCK_SIZE, + DES_BLOCK_SIZE); + crypto_inc(walk.iv, DES_BLOCK_SIZE); + ret = skcipher_walk_done(&walk, nbytes - n); + } + if (locked) + mutex_unlock(&ctrblk_lock); + /* final block may be < DES_BLOCK_SIZE, copy only nbytes */ + if (nbytes) { + cpacf_kmctr(fc, ctx->key, buf, walk.src.virt.addr, + DES_BLOCK_SIZE, walk.iv); + memcpy(walk.dst.virt.addr, buf, nbytes); + crypto_inc(walk.iv, DES_BLOCK_SIZE); + ret = skcipher_walk_done(&walk, 0); + } + return ret; +} + +static int ctr_des_crypt(struct skcipher_request *req) +{ + return ctr_desall_crypt(req, CPACF_KMCTR_DEA); +} + +static struct skcipher_alg ctr_des_alg = { + .base.cra_name = "ctr(des)", + .base.cra_driver_name = "ctr-des-s390", + .base.cra_priority = 400, /* combo: des + ctr */ + .base.cra_blocksize = 1, + .base.cra_ctxsize = sizeof(struct s390_des_ctx), + .base.cra_module = THIS_MODULE, + .min_keysize = DES_KEY_SIZE, + .max_keysize = DES_KEY_SIZE, + .ivsize = DES_BLOCK_SIZE, + .setkey = des_setkey_skcipher, + .encrypt = ctr_des_crypt, + .decrypt = ctr_des_crypt, + .chunksize = DES_BLOCK_SIZE, +}; + +static int ctr_des3_crypt(struct skcipher_request *req) +{ + return ctr_desall_crypt(req, CPACF_KMCTR_TDEA_192); +} + +static struct skcipher_alg ctr_des3_alg = { + .base.cra_name = "ctr(des3_ede)", + .base.cra_driver_name = "ctr-des3_ede-s390", + .base.cra_priority = 400, /* combo: des3 + ede */ + .base.cra_blocksize = 1, + .base.cra_ctxsize = sizeof(struct s390_des_ctx), + .base.cra_module = THIS_MODULE, + .min_keysize = DES3_KEY_SIZE, + .max_keysize = DES3_KEY_SIZE, + .ivsize = DES_BLOCK_SIZE, + .setkey = des3_setkey_skcipher, + .encrypt = ctr_des3_crypt, + .decrypt = ctr_des3_crypt, + .chunksize = DES_BLOCK_SIZE, +}; + +static struct crypto_alg *des_s390_algs_ptr[2]; +static int des_s390_algs_num; +static struct skcipher_alg *des_s390_skciphers_ptr[6]; +static int des_s390_skciphers_num; + +static int des_s390_register_alg(struct crypto_alg *alg) +{ + int ret; + + ret = crypto_register_alg(alg); + if (!ret) + des_s390_algs_ptr[des_s390_algs_num++] = alg; + return ret; +} + +static int des_s390_register_skcipher(struct skcipher_alg *alg) +{ + int ret; + + ret = crypto_register_skcipher(alg); + if (!ret) + des_s390_skciphers_ptr[des_s390_skciphers_num++] = alg; + return ret; +} + +static void des_s390_exit(void) +{ + while (des_s390_algs_num--) + crypto_unregister_alg(des_s390_algs_ptr[des_s390_algs_num]); + while (des_s390_skciphers_num--) + crypto_unregister_skcipher(des_s390_skciphers_ptr[des_s390_skciphers_num]); + if (ctrblk) + free_page((unsigned long) ctrblk); +} + +static int __init des_s390_init(void) +{ + int ret; + + /* Query available functions for KM, KMC and KMCTR */ + cpacf_query(CPACF_KM, &km_functions); + cpacf_query(CPACF_KMC, &kmc_functions); + cpacf_query(CPACF_KMCTR, &kmctr_functions); + + if (cpacf_test_func(&km_functions, CPACF_KM_DEA)) { + ret = des_s390_register_alg(&des_alg); + if (ret) + goto out_err; + ret = des_s390_register_skcipher(&ecb_des_alg); + if (ret) + goto out_err; + } + if (cpacf_test_func(&kmc_functions, CPACF_KMC_DEA)) { + ret = des_s390_register_skcipher(&cbc_des_alg); + if (ret) + goto out_err; + } + if (cpacf_test_func(&km_functions, CPACF_KM_TDEA_192)) { + ret = des_s390_register_alg(&des3_alg); + if (ret) + goto out_err; + ret = des_s390_register_skcipher(&ecb_des3_alg); + if (ret) + goto out_err; + } + 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(S390_CPU_FEATURE_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"); |