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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * Cryptographic API.
- *
- * powerpc implementation of the SHA1 Secure Hash Algorithm.
- *
- * Derived from cryptoapi implementation, adapted for in-place
- * scatterlist interface.
- *
- * Derived from "crypto/sha1.c"
- * Copyright (c) Alan Smithee.
- * Copyright (c) Andrew McDonald <[email protected]>
- * Copyright (c) Jean-Francois Dive <[email protected]>
- */
- #include <crypto/internal/hash.h>
- #include <linux/init.h>
- #include <linux/module.h>
- #include <linux/mm.h>
- #include <linux/types.h>
- #include <crypto/sha1.h>
- #include <crypto/sha1_base.h>
- #include <asm/byteorder.h>
- void powerpc_sha_transform(u32 *state, const u8 *src);
- static int powerpc_sha1_update(struct shash_desc *desc, const u8 *data,
- unsigned int len)
- {
- struct sha1_state *sctx = shash_desc_ctx(desc);
- unsigned int partial, done;
- const u8 *src;
- partial = sctx->count & 0x3f;
- sctx->count += len;
- done = 0;
- src = data;
- if ((partial + len) > 63) {
- if (partial) {
- done = -partial;
- memcpy(sctx->buffer + partial, data, done + 64);
- src = sctx->buffer;
- }
- do {
- powerpc_sha_transform(sctx->state, src);
- done += 64;
- src = data + done;
- } while (done + 63 < len);
- partial = 0;
- }
- memcpy(sctx->buffer + partial, src, len - done);
- return 0;
- }
- /* Add padding and return the message digest. */
- static int powerpc_sha1_final(struct shash_desc *desc, u8 *out)
- {
- struct sha1_state *sctx = shash_desc_ctx(desc);
- __be32 *dst = (__be32 *)out;
- u32 i, index, padlen;
- __be64 bits;
- static const u8 padding[64] = { 0x80, };
- bits = cpu_to_be64(sctx->count << 3);
- /* Pad out to 56 mod 64 */
- index = sctx->count & 0x3f;
- padlen = (index < 56) ? (56 - index) : ((64+56) - index);
- powerpc_sha1_update(desc, padding, padlen);
- /* Append length */
- powerpc_sha1_update(desc, (const u8 *)&bits, sizeof(bits));
- /* Store state in digest */
- for (i = 0; i < 5; i++)
- dst[i] = cpu_to_be32(sctx->state[i]);
- /* Wipe context */
- memset(sctx, 0, sizeof *sctx);
- return 0;
- }
- static int powerpc_sha1_export(struct shash_desc *desc, void *out)
- {
- struct sha1_state *sctx = shash_desc_ctx(desc);
- memcpy(out, sctx, sizeof(*sctx));
- return 0;
- }
- static int powerpc_sha1_import(struct shash_desc *desc, const void *in)
- {
- struct sha1_state *sctx = shash_desc_ctx(desc);
- memcpy(sctx, in, sizeof(*sctx));
- return 0;
- }
- static struct shash_alg alg = {
- .digestsize = SHA1_DIGEST_SIZE,
- .init = sha1_base_init,
- .update = powerpc_sha1_update,
- .final = powerpc_sha1_final,
- .export = powerpc_sha1_export,
- .import = powerpc_sha1_import,
- .descsize = sizeof(struct sha1_state),
- .statesize = sizeof(struct sha1_state),
- .base = {
- .cra_name = "sha1",
- .cra_driver_name= "sha1-powerpc",
- .cra_blocksize = SHA1_BLOCK_SIZE,
- .cra_module = THIS_MODULE,
- }
- };
- static int __init sha1_powerpc_mod_init(void)
- {
- return crypto_register_shash(&alg);
- }
- static void __exit sha1_powerpc_mod_fini(void)
- {
- crypto_unregister_shash(&alg);
- }
- module_init(sha1_powerpc_mod_init);
- module_exit(sha1_powerpc_mod_fini);
- MODULE_LICENSE("GPL");
- MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
- MODULE_ALIAS_CRYPTO("sha1");
- MODULE_ALIAS_CRYPTO("sha1-powerpc");
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