| /* |
| * Synchronous Cryptographic Hash operations. |
| * |
| * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au> |
| * |
| * 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. |
| * |
| */ |
| |
| #include <crypto/scatterwalk.h> |
| #include <crypto/internal/hash.h> |
| #include <linux/err.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <linux/seq_file.h> |
| |
| #include "internal.h" |
| |
| static const struct crypto_type crypto_shash_type; |
| |
| static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key, |
| unsigned int keylen) |
| { |
| struct shash_alg *shash = crypto_shash_alg(tfm); |
| unsigned long alignmask = crypto_shash_alignmask(tfm); |
| unsigned long absize; |
| u8 *buffer, *alignbuffer; |
| int err; |
| |
| absize = keylen + (alignmask & ~(CRYPTO_MINALIGN - 1)); |
| buffer = kmalloc(absize, GFP_KERNEL); |
| if (!buffer) |
| return -ENOMEM; |
| |
| alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); |
| memcpy(alignbuffer, key, keylen); |
| err = shash->setkey(tfm, alignbuffer, keylen); |
| memset(alignbuffer, 0, keylen); |
| kfree(buffer); |
| return err; |
| } |
| |
| int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key, |
| unsigned int keylen) |
| { |
| struct shash_alg *shash = crypto_shash_alg(tfm); |
| unsigned long alignmask = crypto_shash_alignmask(tfm); |
| |
| if (!shash->setkey) |
| return -ENOSYS; |
| |
| if ((unsigned long)key & alignmask) |
| return shash_setkey_unaligned(tfm, key, keylen); |
| |
| return shash->setkey(tfm, key, keylen); |
| } |
| EXPORT_SYMBOL_GPL(crypto_shash_setkey); |
| |
| static inline unsigned int shash_align_buffer_size(unsigned len, |
| unsigned long mask) |
| { |
| return len + (mask & ~(__alignof__(u8 __attribute__ ((aligned))) - 1)); |
| } |
| |
| static int shash_update_unaligned(struct shash_desc *desc, const u8 *data, |
| unsigned int len) |
| { |
| struct crypto_shash *tfm = desc->tfm; |
| struct shash_alg *shash = crypto_shash_alg(tfm); |
| unsigned long alignmask = crypto_shash_alignmask(tfm); |
| unsigned int unaligned_len = alignmask + 1 - |
| ((unsigned long)data & alignmask); |
| u8 buf[shash_align_buffer_size(unaligned_len, alignmask)] |
| __attribute__ ((aligned)); |
| |
| if (unaligned_len > len) |
| unaligned_len = len; |
| |
| memcpy(buf, data, unaligned_len); |
| |
| return shash->update(desc, buf, unaligned_len) ?: |
| shash->update(desc, data + unaligned_len, len - unaligned_len); |
| } |
| |
| int crypto_shash_update(struct shash_desc *desc, const u8 *data, |
| unsigned int len) |
| { |
| struct crypto_shash *tfm = desc->tfm; |
| struct shash_alg *shash = crypto_shash_alg(tfm); |
| unsigned long alignmask = crypto_shash_alignmask(tfm); |
| |
| if ((unsigned long)data & alignmask) |
| return shash_update_unaligned(desc, data, len); |
| |
| return shash->update(desc, data, len); |
| } |
| EXPORT_SYMBOL_GPL(crypto_shash_update); |
| |
| static int shash_final_unaligned(struct shash_desc *desc, u8 *out) |
| { |
| struct crypto_shash *tfm = desc->tfm; |
| unsigned long alignmask = crypto_shash_alignmask(tfm); |
| struct shash_alg *shash = crypto_shash_alg(tfm); |
| unsigned int ds = crypto_shash_digestsize(tfm); |
| u8 buf[shash_align_buffer_size(ds, alignmask)] |
| __attribute__ ((aligned)); |
| int err; |
| |
| err = shash->final(desc, buf); |
| memcpy(out, buf, ds); |
| return err; |
| } |
| |
| int crypto_shash_final(struct shash_desc *desc, u8 *out) |
| { |
| struct crypto_shash *tfm = desc->tfm; |
| struct shash_alg *shash = crypto_shash_alg(tfm); |
| unsigned long alignmask = crypto_shash_alignmask(tfm); |
| |
| if ((unsigned long)out & alignmask) |
| return shash_final_unaligned(desc, out); |
| |
| return shash->final(desc, out); |
| } |
| EXPORT_SYMBOL_GPL(crypto_shash_final); |
| |
| static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data, |
| unsigned int len, u8 *out) |
| { |
| return crypto_shash_update(desc, data, len) ?: |
| crypto_shash_final(desc, out); |
| } |
| |
| int crypto_shash_finup(struct shash_desc *desc, const u8 *data, |
| unsigned int len, u8 *out) |
| { |
| struct crypto_shash *tfm = desc->tfm; |
| struct shash_alg *shash = crypto_shash_alg(tfm); |
| unsigned long alignmask = crypto_shash_alignmask(tfm); |
| |
| if (((unsigned long)data | (unsigned long)out) & alignmask || |
| !shash->finup) |
| return shash_finup_unaligned(desc, data, len, out); |
| |
| return shash->finup(desc, data, len, out); |
| } |
| EXPORT_SYMBOL_GPL(crypto_shash_finup); |
| |
| static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data, |
| unsigned int len, u8 *out) |
| { |
| return crypto_shash_init(desc) ?: |
| crypto_shash_update(desc, data, len) ?: |
| crypto_shash_final(desc, out); |
| } |
| |
| int crypto_shash_digest(struct shash_desc *desc, const u8 *data, |
| unsigned int len, u8 *out) |
| { |
| struct crypto_shash *tfm = desc->tfm; |
| struct shash_alg *shash = crypto_shash_alg(tfm); |
| unsigned long alignmask = crypto_shash_alignmask(tfm); |
| |
| if (((unsigned long)data | (unsigned long)out) & alignmask || |
| !shash->digest) |
| return shash_digest_unaligned(desc, data, len, out); |
| |
| return shash->digest(desc, data, len, out); |
| } |
| EXPORT_SYMBOL_GPL(crypto_shash_digest); |
| |
| int crypto_shash_import(struct shash_desc *desc, const u8 *in) |
| { |
| struct crypto_shash *tfm = desc->tfm; |
| struct shash_alg *alg = crypto_shash_alg(tfm); |
| |
| memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(tfm)); |
| |
| if (alg->reinit) |
| alg->reinit(desc); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(crypto_shash_import); |
| |
| static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key, |
| unsigned int keylen) |
| { |
| struct crypto_shash **ctx = crypto_ahash_ctx(tfm); |
| |
| return crypto_shash_setkey(*ctx, key, keylen); |
| } |
| |
| static int shash_async_init(struct ahash_request *req) |
| { |
| struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); |
| struct shash_desc *desc = ahash_request_ctx(req); |
| |
| desc->tfm = *ctx; |
| desc->flags = req->base.flags; |
| |
| return crypto_shash_init(desc); |
| } |
| |
| static int shash_async_update(struct ahash_request *req) |
| { |
| struct shash_desc *desc = ahash_request_ctx(req); |
| struct crypto_hash_walk walk; |
| int nbytes; |
| |
| for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0; |
| nbytes = crypto_hash_walk_done(&walk, nbytes)) |
| nbytes = crypto_shash_update(desc, walk.data, nbytes); |
| |
| return nbytes; |
| } |
| |
| static int shash_async_final(struct ahash_request *req) |
| { |
| return crypto_shash_final(ahash_request_ctx(req), req->result); |
| } |
| |
| static int shash_async_digest(struct ahash_request *req) |
| { |
| struct scatterlist *sg = req->src; |
| unsigned int offset = sg->offset; |
| unsigned int nbytes = req->nbytes; |
| int err; |
| |
| if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) { |
| struct crypto_shash **ctx = |
| crypto_ahash_ctx(crypto_ahash_reqtfm(req)); |
| struct shash_desc *desc = ahash_request_ctx(req); |
| void *data; |
| |
| desc->tfm = *ctx; |
| desc->flags = req->base.flags; |
| |
| data = crypto_kmap(sg_page(sg), 0); |
| err = crypto_shash_digest(desc, data + offset, nbytes, |
| req->result); |
| crypto_kunmap(data, 0); |
| crypto_yield(desc->flags); |
| goto out; |
| } |
| |
| err = shash_async_init(req); |
| if (err) |
| goto out; |
| |
| err = shash_async_update(req); |
| if (err) |
| goto out; |
| |
| err = shash_async_final(req); |
| |
| out: |
| return err; |
| } |
| |
| static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm) |
| { |
| struct crypto_shash **ctx = crypto_tfm_ctx(tfm); |
| |
| crypto_free_shash(*ctx); |
| } |
| |
| static int crypto_init_shash_ops_async(struct crypto_tfm *tfm) |
| { |
| struct crypto_alg *calg = tfm->__crt_alg; |
| struct shash_alg *alg = __crypto_shash_alg(calg); |
| struct ahash_tfm *crt = &tfm->crt_ahash; |
| struct crypto_shash **ctx = crypto_tfm_ctx(tfm); |
| struct crypto_shash *shash; |
| |
| if (!crypto_mod_get(calg)) |
| return -EAGAIN; |
| |
| shash = crypto_create_tfm(calg, &crypto_shash_type); |
| if (IS_ERR(shash)) { |
| crypto_mod_put(calg); |
| return PTR_ERR(shash); |
| } |
| |
| *ctx = shash; |
| tfm->exit = crypto_exit_shash_ops_async; |
| |
| crt->init = shash_async_init; |
| crt->update = shash_async_update; |
| crt->final = shash_async_final; |
| crt->digest = shash_async_digest; |
| crt->setkey = shash_async_setkey; |
| |
| crt->digestsize = alg->digestsize; |
| crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash); |
| |
| return 0; |
| } |
| |
| static int shash_compat_setkey(struct crypto_hash *tfm, const u8 *key, |
| unsigned int keylen) |
| { |
| struct shash_desc *desc = crypto_hash_ctx(tfm); |
| |
| return crypto_shash_setkey(desc->tfm, key, keylen); |
| } |
| |
| static int shash_compat_init(struct hash_desc *hdesc) |
| { |
| struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm); |
| |
| desc->flags = hdesc->flags; |
| |
| return crypto_shash_init(desc); |
| } |
| |
| static int shash_compat_update(struct hash_desc *hdesc, struct scatterlist *sg, |
| unsigned int len) |
| { |
| struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm); |
| struct crypto_hash_walk walk; |
| int nbytes; |
| |
| for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len); |
| nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes)) |
| nbytes = crypto_shash_update(desc, walk.data, nbytes); |
| |
| return nbytes; |
| } |
| |
| static int shash_compat_final(struct hash_desc *hdesc, u8 *out) |
| { |
| return crypto_shash_final(crypto_hash_ctx(hdesc->tfm), out); |
| } |
| |
| static int shash_compat_digest(struct hash_desc *hdesc, struct scatterlist *sg, |
| unsigned int nbytes, u8 *out) |
| { |
| unsigned int offset = sg->offset; |
| int err; |
| |
| if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) { |
| struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm); |
| void *data; |
| |
| desc->flags = hdesc->flags; |
| |
| data = crypto_kmap(sg_page(sg), 0); |
| err = crypto_shash_digest(desc, data + offset, nbytes, out); |
| crypto_kunmap(data, 0); |
| crypto_yield(desc->flags); |
| goto out; |
| } |
| |
| err = shash_compat_init(hdesc); |
| if (err) |
| goto out; |
| |
| err = shash_compat_update(hdesc, sg, nbytes); |
| if (err) |
| goto out; |
| |
| err = shash_compat_final(hdesc, out); |
| |
| out: |
| return err; |
| } |
| |
| static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm) |
| { |
| struct shash_desc *desc= crypto_tfm_ctx(tfm); |
| |
| crypto_free_shash(desc->tfm); |
| } |
| |
| static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm) |
| { |
| struct hash_tfm *crt = &tfm->crt_hash; |
| struct crypto_alg *calg = tfm->__crt_alg; |
| struct shash_alg *alg = __crypto_shash_alg(calg); |
| struct shash_desc *desc = crypto_tfm_ctx(tfm); |
| struct crypto_shash *shash; |
| |
| if (!crypto_mod_get(calg)) |
| return -EAGAIN; |
| |
| shash = crypto_create_tfm(calg, &crypto_shash_type); |
| if (IS_ERR(shash)) { |
| crypto_mod_put(calg); |
| return PTR_ERR(shash); |
| } |
| |
| desc->tfm = shash; |
| tfm->exit = crypto_exit_shash_ops_compat; |
| |
| crt->init = shash_compat_init; |
| crt->update = shash_compat_update; |
| crt->final = shash_compat_final; |
| crt->digest = shash_compat_digest; |
| crt->setkey = shash_compat_setkey; |
| |
| crt->digestsize = alg->digestsize; |
| |
| return 0; |
| } |
| |
| static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask) |
| { |
| switch (mask & CRYPTO_ALG_TYPE_MASK) { |
| case CRYPTO_ALG_TYPE_HASH_MASK: |
| return crypto_init_shash_ops_compat(tfm); |
| case CRYPTO_ALG_TYPE_AHASH_MASK: |
| return crypto_init_shash_ops_async(tfm); |
| } |
| |
| return -EINVAL; |
| } |
| |
| static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type, |
| u32 mask) |
| { |
| struct shash_alg *salg = __crypto_shash_alg(alg); |
| |
| switch (mask & CRYPTO_ALG_TYPE_MASK) { |
| case CRYPTO_ALG_TYPE_HASH_MASK: |
| return sizeof(struct shash_desc) + salg->descsize; |
| case CRYPTO_ALG_TYPE_AHASH_MASK: |
| return sizeof(struct crypto_shash *); |
| } |
| |
| return 0; |
| } |
| |
| static int crypto_shash_init_tfm(struct crypto_tfm *tfm, |
| const struct crypto_type *frontend) |
| { |
| return 0; |
| } |
| |
| static unsigned int crypto_shash_extsize(struct crypto_alg *alg, |
| const struct crypto_type *frontend) |
| { |
| return alg->cra_ctxsize; |
| } |
| |
| static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg) |
| __attribute__ ((unused)); |
| static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg) |
| { |
| struct shash_alg *salg = __crypto_shash_alg(alg); |
| |
| seq_printf(m, "type : shash\n"); |
| seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); |
| seq_printf(m, "digestsize : %u\n", salg->digestsize); |
| seq_printf(m, "descsize : %u\n", salg->descsize); |
| } |
| |
| static const struct crypto_type crypto_shash_type = { |
| .ctxsize = crypto_shash_ctxsize, |
| .extsize = crypto_shash_extsize, |
| .init = crypto_init_shash_ops, |
| .init_tfm = crypto_shash_init_tfm, |
| #ifdef CONFIG_PROC_FS |
| .show = crypto_shash_show, |
| #endif |
| .maskclear = ~CRYPTO_ALG_TYPE_MASK, |
| .maskset = CRYPTO_ALG_TYPE_MASK, |
| .type = CRYPTO_ALG_TYPE_SHASH, |
| .tfmsize = offsetof(struct crypto_shash, base), |
| }; |
| |
| struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type, |
| u32 mask) |
| { |
| return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask); |
| } |
| EXPORT_SYMBOL_GPL(crypto_alloc_shash); |
| |
| int crypto_register_shash(struct shash_alg *alg) |
| { |
| struct crypto_alg *base = &alg->base; |
| |
| if (alg->digestsize > PAGE_SIZE / 8 || |
| alg->descsize > PAGE_SIZE / 8) |
| return -EINVAL; |
| |
| base->cra_type = &crypto_shash_type; |
| base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; |
| base->cra_flags |= CRYPTO_ALG_TYPE_SHASH; |
| |
| return crypto_register_alg(base); |
| } |
| EXPORT_SYMBOL_GPL(crypto_register_shash); |
| |
| int crypto_unregister_shash(struct shash_alg *alg) |
| { |
| return crypto_unregister_alg(&alg->base); |
| } |
| EXPORT_SYMBOL_GPL(crypto_unregister_shash); |
| |
| void shash_free_instance(struct crypto_instance *inst) |
| { |
| crypto_drop_spawn(crypto_instance_ctx(inst)); |
| kfree(shash_instance(inst)); |
| } |
| EXPORT_SYMBOL_GPL(shash_free_instance); |
| |
| int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn, |
| struct shash_alg *alg, |
| struct crypto_instance *inst) |
| { |
| return crypto_init_spawn2(&spawn->base, &alg->base, inst, |
| &crypto_shash_type); |
| } |
| EXPORT_SYMBOL_GPL(crypto_init_shash_spawn); |
| |
| struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask) |
| { |
| struct crypto_alg *alg; |
| |
| alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask); |
| return IS_ERR(alg) ? ERR_CAST(alg) : |
| container_of(alg, struct shash_alg, base); |
| } |
| EXPORT_SYMBOL_GPL(shash_attr_alg); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_DESCRIPTION("Synchronous cryptographic hash type"); |