/* * Cryptographic API. * * s390 implementation of the AES Cipher Algorithm. * * s390 Version: * Copyright IBM Corp. 2005, 2007 * Author(s): Jan Glauber (jang@de.ibm.com) * Sebastian Siewior (sebastian@breakpoint.cc> SW-Fallback * * Derived from "crypto/aes_generic.c" * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the Free * Software Foundation; either version 2 of the License, or (at your option) * any later version. * */ #define KMSG_COMPONENT "aes_s390" #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt #include #include #include #include #include #include #include #include #include #include #define AES_KEYLEN_128 1 #define AES_KEYLEN_192 2 #define AES_KEYLEN_256 4 static u8 *ctrblk; static DEFINE_SPINLOCK(ctrblk_lock); static char keylen_flag; struct s390_aes_ctx { u8 key[AES_MAX_KEY_SIZE]; int key_len; unsigned long fc; union { struct crypto_skcipher *blk; struct crypto_cipher *cip; } fallback; }; struct pcc_param { u8 key[32]; u8 tweak[16]; u8 block[16]; u8 bit[16]; u8 xts[16]; }; struct s390_xts_ctx { u8 key[32]; u8 pcc_key[32]; int key_len; unsigned long fc; struct crypto_skcipher *fallback; }; /* * Check if the key_len is supported by the HW. * Returns 0 if it is, a positive number if it is not and software fallback is * required or a negative number in case the key size is not valid */ static int need_fallback(unsigned int key_len) { switch (key_len) { case 16: if (!(keylen_flag & AES_KEYLEN_128)) return 1; break; case 24: if (!(keylen_flag & AES_KEYLEN_192)) return 1; break; case 32: if (!(keylen_flag & AES_KEYLEN_256)) return 1; break; default: return -1; break; } return 0; } static int setkey_fallback_cip(struct crypto_tfm *tfm, const u8 *in_key, unsigned int key_len) { struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); int ret; sctx->fallback.cip->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK; sctx->fallback.cip->base.crt_flags |= (tfm->crt_flags & CRYPTO_TFM_REQ_MASK); ret = crypto_cipher_setkey(sctx->fallback.cip, in_key, key_len); if (ret) { tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK; tfm->crt_flags |= (sctx->fallback.cip->base.crt_flags & CRYPTO_TFM_RES_MASK); } return ret; } static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key, unsigned int key_len) { struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); u32 *flags = &tfm->crt_flags; int ret; ret = need_fallback(key_len); if (ret < 0) { *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; return -EINVAL; } sctx->key_len = key_len; if (!ret) { memcpy(sctx->key, in_key, key_len); return 0; } return setkey_fallback_cip(tfm, in_key, key_len); } static void aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) { struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); if (unlikely(need_fallback(sctx->key_len))) { crypto_cipher_encrypt_one(sctx->fallback.cip, out, in); return; } switch (sctx->key_len) { case 16: cpacf_km(CPACF_KM_AES_128, &sctx->key, out, in, AES_BLOCK_SIZE); break; case 24: cpacf_km(CPACF_KM_AES_192, &sctx->key, out, in, AES_BLOCK_SIZE); break; case 32: cpacf_km(CPACF_KM_AES_256, &sctx->key, out, in, AES_BLOCK_SIZE); break; } } static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) { struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); if (unlikely(need_fallback(sctx->key_len))) { crypto_cipher_decrypt_one(sctx->fallback.cip, out, in); return; } switch (sctx->key_len) { case 16: cpacf_km(CPACF_KM_AES_128 | CPACF_DECRYPT, &sctx->key, out, in, AES_BLOCK_SIZE); break; case 24: cpacf_km(CPACF_KM_AES_192 | CPACF_DECRYPT, &sctx->key, out, in, AES_BLOCK_SIZE); break; case 32: cpacf_km(CPACF_KM_AES_256 | CPACF_DECRYPT, &sctx->key, out, in, AES_BLOCK_SIZE); break; } } static int fallback_init_cip(struct crypto_tfm *tfm) { const char *name = tfm->__crt_alg->cra_name; struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); sctx->fallback.cip = crypto_alloc_cipher(name, 0, CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK); if (IS_ERR(sctx->fallback.cip)) { pr_err("Allocating AES fallback algorithm %s failed\n", name); return PTR_ERR(sctx->fallback.cip); } return 0; } static void fallback_exit_cip(struct crypto_tfm *tfm) { struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); crypto_free_cipher(sctx->fallback.cip); sctx->fallback.cip = NULL; } static struct crypto_alg aes_alg = { .cra_name = "aes", .cra_driver_name = "aes-s390", .cra_priority = 300, .cra_flags = CRYPTO_ALG_TYPE_CIPHER | CRYPTO_ALG_NEED_FALLBACK, .cra_blocksize = AES_BLOCK_SIZE, .cra_ctxsize = sizeof(struct s390_aes_ctx), .cra_module = THIS_MODULE, .cra_init = fallback_init_cip, .cra_exit = fallback_exit_cip, .cra_u = { .cipher = { .cia_min_keysize = AES_MIN_KEY_SIZE, .cia_max_keysize = AES_MAX_KEY_SIZE, .cia_setkey = aes_set_key, .cia_encrypt = aes_encrypt, .cia_decrypt = aes_decrypt, } } }; static int setkey_fallback_blk(struct crypto_tfm *tfm, const u8 *key, unsigned int len) { struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); unsigned int ret; crypto_skcipher_clear_flags(sctx->fallback.blk, CRYPTO_TFM_REQ_MASK); crypto_skcipher_set_flags(sctx->fallback.blk, tfm->crt_flags & CRYPTO_TFM_REQ_MASK); ret = crypto_skcipher_setkey(sctx->fallback.blk, key, len); tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK; tfm->crt_flags |= crypto_skcipher_get_flags(sctx->fallback.blk) & CRYPTO_TFM_RES_MASK; return ret; } static int fallback_blk_dec(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes) { unsigned int ret; struct crypto_blkcipher *tfm = desc->tfm; struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(tfm); SKCIPHER_REQUEST_ON_STACK(req, sctx->fallback.blk); skcipher_request_set_tfm(req, sctx->fallback.blk); skcipher_request_set_callback(req, desc->flags, NULL, NULL); skcipher_request_set_crypt(req, src, dst, nbytes, desc->info); ret = crypto_skcipher_decrypt(req); skcipher_request_zero(req); return ret; } static int fallback_blk_enc(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes) { unsigned int ret; struct crypto_blkcipher *tfm = desc->tfm; struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(tfm); SKCIPHER_REQUEST_ON_STACK(req, sctx->fallback.blk); skcipher_request_set_tfm(req, sctx->fallback.blk); skcipher_request_set_callback(req, desc->flags, NULL, NULL); skcipher_request_set_crypt(req, src, dst, nbytes, desc->info); ret = crypto_skcipher_encrypt(req); return ret; } static int ecb_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key, unsigned int key_len) { struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); int ret; ret = need_fallback(key_len); if (ret > 0) { sctx->key_len = key_len; return setkey_fallback_blk(tfm, in_key, key_len); } switch (key_len) { case 16: sctx->fc = CPACF_KM_AES_128; break; case 24: sctx->fc = CPACF_KM_AES_192; break; case 32: sctx->fc = CPACF_KM_AES_256; break; } return aes_set_key(tfm, in_key, key_len); } static int ecb_aes_crypt(struct blkcipher_desc *desc, long func, void *param, struct blkcipher_walk *walk) { int ret = blkcipher_walk_virt(desc, walk); unsigned int nbytes; while ((nbytes = walk->nbytes)) { /* only use complete blocks */ unsigned int n = nbytes & ~(AES_BLOCK_SIZE - 1); u8 *out = walk->dst.virt.addr; u8 *in = walk->src.virt.addr; ret = cpacf_km(func, param, out, in, n); if (ret < 0 || ret != n) return -EIO; nbytes &= AES_BLOCK_SIZE - 1; ret = blkcipher_walk_done(desc, walk, nbytes); } return ret; } static int ecb_aes_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes) { struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm); struct blkcipher_walk walk; if (unlikely(need_fallback(sctx->key_len))) return fallback_blk_enc(desc, dst, src, nbytes); blkcipher_walk_init(&walk, dst, src, nbytes); return ecb_aes_crypt(desc, sctx->fc, sctx->key, &walk); } static int ecb_aes_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes) { struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm); struct blkcipher_walk walk; if (unlikely(need_fallback(sctx->key_len))) return fallback_blk_dec(desc, dst, src, nbytes); blkcipher_walk_init(&walk, dst, src, nbytes); return ecb_aes_crypt(desc, sctx->fc | CPACF_DECRYPT, sctx->key, &walk); } static int fallback_init_blk(struct crypto_tfm *tfm) { const char *name = tfm->__crt_alg->cra_name; struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); sctx->fallback.blk = crypto_alloc_skcipher(name, 0, CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK); if (IS_ERR(sctx->fallback.blk)) { pr_err("Allocating AES fallback algorithm %s failed\n", name); return PTR_ERR(sctx->fallback.blk); } return 0; } static void fallback_exit_blk(struct crypto_tfm *tfm) { struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); crypto_free_skcipher(sctx->fallback.blk); } static struct crypto_alg ecb_aes_alg = { .cra_name = "ecb(aes)", .cra_driver_name = "ecb-aes-s390", .cra_priority = 400, /* combo: aes + ecb */ .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER | CRYPTO_ALG_NEED_FALLBACK, .cra_blocksize = AES_BLOCK_SIZE, .cra_ctxsize = sizeof(struct s390_aes_ctx), .cra_type = &crypto_blkcipher_type, .cra_module = THIS_MODULE, .cra_init = fallback_init_blk, .cra_exit = fallback_exit_blk, .cra_u = { .blkcipher = { .min_keysize = AES_MIN_KEY_SIZE, .max_keysize = AES_MAX_KEY_SIZE, .setkey = ecb_aes_set_key, .encrypt = ecb_aes_encrypt, .decrypt = ecb_aes_decrypt, } } }; static int cbc_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key, unsigned int key_len) { struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); int ret; ret = need_fallback(key_len); if (ret > 0) { sctx->key_len = key_len; return setkey_fallback_blk(tfm, in_key, key_len); } switch (key_len) { case 16: sctx->fc = CPACF_KMC_AES_128; break; case 24: sctx->fc = CPACF_KMC_AES_192; break; case 32: sctx->fc = CPACF_KMC_AES_256; break; } return aes_set_key(tfm, in_key, key_len); } static int cbc_aes_crypt(struct blkcipher_desc *desc, long func, struct blkcipher_walk *walk) { struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm); int ret = blkcipher_walk_virt(desc, walk); unsigned int nbytes = walk->nbytes; struct { u8 iv[AES_BLOCK_SIZE]; u8 key[AES_MAX_KEY_SIZE]; } param; if (!nbytes) goto out; memcpy(param.iv, walk->iv, AES_BLOCK_SIZE); memcpy(param.key, sctx->key, sctx->key_len); do { /* only use complete blocks */ unsigned int n = nbytes & ~(AES_BLOCK_SIZE - 1); u8 *out = walk->dst.virt.addr; u8 *in = walk->src.virt.addr; ret = cpacf_kmc(func, ¶m, out, in, n); if (ret < 0 || ret != n) return -EIO; nbytes &= AES_BLOCK_SIZE - 1; ret = blkcipher_walk_done(desc, walk, nbytes); } while ((nbytes = walk->nbytes)); memcpy(walk->iv, param.iv, AES_BLOCK_SIZE); out: return ret; } static int cbc_aes_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes) { struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm); struct blkcipher_walk walk; if (unlikely(need_fallback(sctx->key_len))) return fallback_blk_enc(desc, dst, src, nbytes); blkcipher_walk_init(&walk, dst, src, nbytes); return cbc_aes_crypt(desc, sctx->fc, &walk); } static int cbc_aes_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes) { struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm); struct blkcipher_walk walk; if (unlikely(need_fallback(sctx->key_len))) return fallback_blk_dec(desc, dst, src, nbytes); blkcipher_walk_init(&walk, dst, src, nbytes); return cbc_aes_crypt(desc, sctx->fc | CPACF_DECRYPT, &walk); } static struct crypto_alg cbc_aes_alg = { .cra_name = "cbc(aes)", .cra_driver_name = "cbc-aes-s390", .cra_priority = 400, /* combo: aes + cbc */ .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER | CRYPTO_ALG_NEED_FALLBACK, .cra_blocksize = AES_BLOCK_SIZE, .cra_ctxsize = sizeof(struct s390_aes_ctx), .cra_type = &crypto_blkcipher_type, .cra_module = THIS_MODULE, .cra_init = fallback_init_blk, .cra_exit = fallback_exit_blk, .cra_u = { .blkcipher = { .min_keysize = AES_MIN_KEY_SIZE, .max_keysize = AES_MAX_KEY_SIZE, .ivsize = AES_BLOCK_SIZE, .setkey = cbc_aes_set_key, .encrypt = cbc_aes_encrypt, .decrypt = cbc_aes_decrypt, } } }; static int xts_fallback_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int len) { struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm); unsigned int ret; crypto_skcipher_clear_flags(xts_ctx->fallback, CRYPTO_TFM_REQ_MASK); crypto_skcipher_set_flags(xts_ctx->fallback, tfm->crt_flags & CRYPTO_TFM_REQ_MASK); ret = crypto_skcipher_setkey(xts_ctx->fallback, key, len); tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK; tfm->crt_flags |= crypto_skcipher_get_flags(xts_ctx->fallback) & CRYPTO_TFM_RES_MASK; return ret; } static int xts_fallback_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes) { struct crypto_blkcipher *tfm = desc->tfm; struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(tfm); SKCIPHER_REQUEST_ON_STACK(req, xts_ctx->fallback); unsigned int ret; skcipher_request_set_tfm(req, xts_ctx->fallback); skcipher_request_set_callback(req, desc->flags, NULL, NULL); skcipher_request_set_crypt(req, src, dst, nbytes, desc->info); ret = crypto_skcipher_decrypt(req); skcipher_request_zero(req); return ret; } static int xts_fallback_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes) { struct crypto_blkcipher *tfm = desc->tfm; struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(tfm); SKCIPHER_REQUEST_ON_STACK(req, xts_ctx->fallback); unsigned int ret; skcipher_request_set_tfm(req, xts_ctx->fallback); skcipher_request_set_callback(req, desc->flags, NULL, NULL); skcipher_request_set_crypt(req, src, dst, nbytes, desc->info); ret = crypto_skcipher_encrypt(req); skcipher_request_zero(req); return ret; } static int xts_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key, unsigned int key_len) { struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm); u32 *flags = &tfm->crt_flags; int err; err = xts_check_key(tfm, in_key, key_len); if (err) return err; switch (key_len) { case 32: xts_ctx->fc = CPACF_KM_XTS_128; memcpy(xts_ctx->key + 16, in_key, 16); memcpy(xts_ctx->pcc_key + 16, in_key + 16, 16); break; case 48: xts_ctx->fc = 0; xts_fallback_setkey(tfm, in_key, key_len); break; case 64: xts_ctx->fc = CPACF_KM_XTS_256; memcpy(xts_ctx->key, in_key, 32); memcpy(xts_ctx->pcc_key, in_key + 32, 32); break; default: *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; return -EINVAL; } xts_ctx->key_len = key_len; return 0; } static int xts_aes_crypt(struct blkcipher_desc *desc, long func, struct s390_xts_ctx *xts_ctx, struct blkcipher_walk *walk) { unsigned int offset = (xts_ctx->key_len >> 1) & 0x10; int ret = blkcipher_walk_virt(desc, walk); unsigned int nbytes = walk->nbytes; unsigned int n; u8 *in, *out; struct pcc_param pcc_param; struct { u8 key[32]; u8 init[16]; } xts_param; if (!nbytes) goto out; memset(pcc_param.block, 0, sizeof(pcc_param.block)); memset(pcc_param.bit, 0, sizeof(pcc_param.bit)); memset(pcc_param.xts, 0, sizeof(pcc_param.xts)); memcpy(pcc_param.tweak, walk->iv, sizeof(pcc_param.tweak)); memcpy(pcc_param.key, xts_ctx->pcc_key, 32); /* remove decipher modifier bit from 'func' and call PCC */ ret = cpacf_pcc(func & 0x7f, &pcc_param.key[offset]); if (ret < 0) return -EIO; memcpy(xts_param.key, xts_ctx->key, 32); memcpy(xts_param.init, pcc_param.xts, 16); do { /* only use complete blocks */ n = nbytes & ~(AES_BLOCK_SIZE - 1); out = walk->dst.virt.addr; in = walk->src.virt.addr; ret = cpacf_km(func, &xts_param.key[offset], out, in, n); if (ret < 0 || ret != n) return -EIO; nbytes &= AES_BLOCK_SIZE - 1; ret = blkcipher_walk_done(desc, walk, nbytes); } while ((nbytes = walk->nbytes)); out: return ret; } static int xts_aes_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes) { struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm); struct blkcipher_walk walk; if (unlikely(xts_ctx->key_len == 48)) return xts_fallback_encrypt(desc, dst, src, nbytes); blkcipher_walk_init(&walk, dst, src, nbytes); return xts_aes_crypt(desc, xts_ctx->fc, xts_ctx, &walk); } static int xts_aes_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes) { struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm); struct blkcipher_walk walk; if (unlikely(xts_ctx->key_len == 48)) return xts_fallback_decrypt(desc, dst, src, nbytes); blkcipher_walk_init(&walk, dst, src, nbytes); return xts_aes_crypt(desc, xts_ctx->fc | CPACF_DECRYPT, xts_ctx, &walk); } static int xts_fallback_init(struct crypto_tfm *tfm) { const char *name = tfm->__crt_alg->cra_name; struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm); xts_ctx->fallback = crypto_alloc_skcipher(name, 0, CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK); if (IS_ERR(xts_ctx->fallback)) { pr_err("Allocating XTS fallback algorithm %s failed\n", name); return PTR_ERR(xts_ctx->fallback); } return 0; } static void xts_fallback_exit(struct crypto_tfm *tfm) { struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm); crypto_free_skcipher(xts_ctx->fallback); } static struct crypto_alg xts_aes_alg = { .cra_name = "xts(aes)", .cra_driver_name = "xts-aes-s390", .cra_priority = 400, /* combo: aes + xts */ .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER | CRYPTO_ALG_NEED_FALLBACK, .cra_blocksize = AES_BLOCK_SIZE, .cra_ctxsize = sizeof(struct s390_xts_ctx), .cra_type = &crypto_blkcipher_type, .cra_module = THIS_MODULE, .cra_init = xts_fallback_init, .cra_exit = xts_fallback_exit, .cra_u = { .blkcipher = { .min_keysize = 2 * AES_MIN_KEY_SIZE, .max_keysize = 2 * AES_MAX_KEY_SIZE, .ivsize = AES_BLOCK_SIZE, .setkey = xts_aes_set_key, .encrypt = xts_aes_encrypt, .decrypt = xts_aes_decrypt, } } }; static int xts_aes_alg_reg; static int ctr_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key, unsigned int key_len) { struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); switch (key_len) { case 16: sctx->fc = CPACF_KMCTR_AES_128; break; case 24: sctx->fc = CPACF_KMCTR_AES_192; break; case 32: sctx->fc = CPACF_KMCTR_AES_256; break; } return aes_set_key(tfm, in_key, key_len); } static unsigned int __ctrblk_init(u8 *ctrptr, unsigned int nbytes) { unsigned int i, n; /* only use complete blocks, max. PAGE_SIZE */ n = (nbytes > PAGE_SIZE) ? PAGE_SIZE : nbytes & ~(AES_BLOCK_SIZE - 1); for (i = AES_BLOCK_SIZE; i < n; i += AES_BLOCK_SIZE) { memcpy(ctrptr + i, ctrptr + i - AES_BLOCK_SIZE, AES_BLOCK_SIZE); crypto_inc(ctrptr + i, AES_BLOCK_SIZE); } return n; } static int ctr_aes_crypt(struct blkcipher_desc *desc, long func, struct s390_aes_ctx *sctx, struct blkcipher_walk *walk) { int ret = blkcipher_walk_virt_block(desc, walk, AES_BLOCK_SIZE); unsigned int n, nbytes; u8 buf[AES_BLOCK_SIZE], ctrbuf[AES_BLOCK_SIZE]; u8 *out, *in, *ctrptr = ctrbuf; if (!walk->nbytes) return ret; if (spin_trylock(&ctrblk_lock)) ctrptr = ctrblk; memcpy(ctrptr, walk->iv, AES_BLOCK_SIZE); while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) { out = walk->dst.virt.addr; in = walk->src.virt.addr; while (nbytes >= AES_BLOCK_SIZE) { if (ctrptr == ctrblk) n = __ctrblk_init(ctrptr, nbytes); else n = AES_BLOCK_SIZE; ret = cpacf_kmctr(func, sctx->key, out, in, n, ctrptr); if (ret < 0 || ret != n) { if (ctrptr == ctrblk) spin_unlock(&ctrblk_lock); return -EIO; } if (n > AES_BLOCK_SIZE) memcpy(ctrptr, ctrptr + n - AES_BLOCK_SIZE, AES_BLOCK_SIZE); crypto_inc(ctrptr, AES_BLOCK_SIZE); out += n; in += n; nbytes -= n; } ret = blkcipher_walk_done(desc, walk, nbytes); } if (ctrptr == ctrblk) { if (nbytes) memcpy(ctrbuf, ctrptr, AES_BLOCK_SIZE); else memcpy(walk->iv, ctrptr, AES_BLOCK_SIZE); spin_unlock(&ctrblk_lock); } else { if (!nbytes) memcpy(walk->iv, ctrptr, AES_BLOCK_SIZE); } /* * final block may be < AES_BLOCK_SIZE, copy only nbytes */ if (nbytes) { out = walk->dst.virt.addr; in = walk->src.virt.addr; ret = cpacf_kmctr(func, sctx->key, buf, in, AES_BLOCK_SIZE, ctrbuf); if (ret < 0 || ret != AES_BLOCK_SIZE) return -EIO; memcpy(out, buf, nbytes); crypto_inc(ctrbuf, AES_BLOCK_SIZE); ret = blkcipher_walk_done(desc, walk, 0); memcpy(walk->iv, ctrbuf, AES_BLOCK_SIZE); } return ret; } static int ctr_aes_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes) { struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm); struct blkcipher_walk walk; blkcipher_walk_init(&walk, dst, src, nbytes); return ctr_aes_crypt(desc, sctx->fc, sctx, &walk); } static int ctr_aes_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes) { struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm); struct blkcipher_walk walk; blkcipher_walk_init(&walk, dst, src, nbytes); return ctr_aes_crypt(desc, sctx->fc | CPACF_DECRYPT, sctx, &walk); } static struct crypto_alg ctr_aes_alg = { .cra_name = "ctr(aes)", .cra_driver_name = "ctr-aes-s390", .cra_priority = 400, /* combo: aes + ctr */ .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, .cra_blocksize = 1, .cra_ctxsize = sizeof(struct s390_aes_ctx), .cra_type = &crypto_blkcipher_type, .cra_module = THIS_MODULE, .cra_u = { .blkcipher = { .min_keysize = AES_MIN_KEY_SIZE, .max_keysize = AES_MAX_KEY_SIZE, .ivsize = AES_BLOCK_SIZE, .setkey = ctr_aes_set_key, .encrypt = ctr_aes_encrypt, .decrypt = ctr_aes_decrypt, } } }; static int ctr_aes_alg_reg; static int __init aes_s390_init(void) { int ret; if (cpacf_query(CPACF_KM, CPACF_KM_AES_128)) keylen_flag |= AES_KEYLEN_128; if (cpacf_query(CPACF_KM, CPACF_KM_AES_192)) keylen_flag |= AES_KEYLEN_192; if (cpacf_query(CPACF_KM, CPACF_KM_AES_256)) keylen_flag |= AES_KEYLEN_256; if (!keylen_flag) return -EOPNOTSUPP; /* z9 109 and z9 BC/EC only support 128 bit key length */ if (keylen_flag == AES_KEYLEN_128) pr_info("AES hardware acceleration is only available for" " 128-bit keys\n"); ret = crypto_register_alg(&aes_alg); if (ret) goto aes_err; ret = crypto_register_alg(&ecb_aes_alg); if (ret) goto ecb_aes_err; ret = crypto_register_alg(&cbc_aes_alg); if (ret) goto cbc_aes_err; if (cpacf_query(CPACF_KM, CPACF_KM_XTS_128) && cpacf_query(CPACF_KM, CPACF_KM_XTS_256)) { ret = crypto_register_alg(&xts_aes_alg); if (ret) goto xts_aes_err; xts_aes_alg_reg = 1; } if (cpacf_query(CPACF_KMCTR, CPACF_KMCTR_AES_128) && cpacf_query(CPACF_KMCTR, CPACF_KMCTR_AES_192) && cpacf_query(CPACF_KMCTR, CPACF_KMCTR_AES_256)) { ctrblk = (u8 *) __get_free_page(GFP_KERNEL); if (!ctrblk) { ret = -ENOMEM; goto ctr_aes_err; } ret = crypto_register_alg(&ctr_aes_alg); if (ret) { free_page((unsigned long) ctrblk); goto ctr_aes_err; } ctr_aes_alg_reg = 1; } out: return ret; ctr_aes_err: crypto_unregister_alg(&xts_aes_alg); xts_aes_err: crypto_unregister_alg(&cbc_aes_alg); cbc_aes_err: crypto_unregister_alg(&ecb_aes_alg); ecb_aes_err: crypto_unregister_alg(&aes_alg); aes_err: goto out; } static void __exit aes_s390_fini(void) { if (ctr_aes_alg_reg) { crypto_unregister_alg(&ctr_aes_alg); free_page((unsigned long) ctrblk); } if (xts_aes_alg_reg) crypto_unregister_alg(&xts_aes_alg); crypto_unregister_alg(&cbc_aes_alg); crypto_unregister_alg(&ecb_aes_alg); crypto_unregister_alg(&aes_alg); } module_cpu_feature_match(MSA, aes_s390_init); module_exit(aes_s390_fini); MODULE_ALIAS_CRYPTO("aes-all"); MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm"); MODULE_LICENSE("GPL");