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236 lines
5.6 KiB
236 lines
5.6 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Cryptographic API. |
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* |
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* SHA1 Secure Hash Algorithm. |
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* |
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* Adapted for OCTEON by Aaro Koskinen <[email protected]>. |
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* |
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* Based on crypto/sha1_generic.c, which is: |
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* |
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* Copyright (c) Alan Smithee. |
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* Copyright (c) Andrew McDonald <[email protected]> |
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* Copyright (c) Jean-Francois Dive <[email protected]> |
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*/ |
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#include <linux/mm.h> |
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#include <crypto/sha1.h> |
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#include <linux/init.h> |
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#include <linux/types.h> |
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#include <linux/module.h> |
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#include <asm/byteorder.h> |
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#include <asm/octeon/octeon.h> |
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#include <crypto/internal/hash.h> |
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#include "octeon-crypto.h" |
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/* |
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* We pass everything as 64-bit. OCTEON can handle misaligned data. |
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*/ |
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static void octeon_sha1_store_hash(struct sha1_state *sctx) |
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{ |
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u64 *hash = (u64 *)sctx->state; |
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union { |
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u32 word[2]; |
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u64 dword; |
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} hash_tail = { { sctx->state[4], } }; |
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write_octeon_64bit_hash_dword(hash[0], 0); |
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write_octeon_64bit_hash_dword(hash[1], 1); |
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write_octeon_64bit_hash_dword(hash_tail.dword, 2); |
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memzero_explicit(&hash_tail.word[0], sizeof(hash_tail.word[0])); |
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} |
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static void octeon_sha1_read_hash(struct sha1_state *sctx) |
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{ |
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u64 *hash = (u64 *)sctx->state; |
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union { |
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u32 word[2]; |
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u64 dword; |
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} hash_tail; |
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hash[0] = read_octeon_64bit_hash_dword(0); |
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hash[1] = read_octeon_64bit_hash_dword(1); |
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hash_tail.dword = read_octeon_64bit_hash_dword(2); |
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sctx->state[4] = hash_tail.word[0]; |
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memzero_explicit(&hash_tail.dword, sizeof(hash_tail.dword)); |
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} |
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static void octeon_sha1_transform(const void *_block) |
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{ |
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const u64 *block = _block; |
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write_octeon_64bit_block_dword(block[0], 0); |
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write_octeon_64bit_block_dword(block[1], 1); |
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write_octeon_64bit_block_dword(block[2], 2); |
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write_octeon_64bit_block_dword(block[3], 3); |
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write_octeon_64bit_block_dword(block[4], 4); |
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write_octeon_64bit_block_dword(block[5], 5); |
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write_octeon_64bit_block_dword(block[6], 6); |
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octeon_sha1_start(block[7]); |
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} |
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static int octeon_sha1_init(struct shash_desc *desc) |
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{ |
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struct sha1_state *sctx = shash_desc_ctx(desc); |
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sctx->state[0] = SHA1_H0; |
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sctx->state[1] = SHA1_H1; |
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sctx->state[2] = SHA1_H2; |
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sctx->state[3] = SHA1_H3; |
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sctx->state[4] = SHA1_H4; |
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sctx->count = 0; |
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return 0; |
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} |
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static void __octeon_sha1_update(struct sha1_state *sctx, const u8 *data, |
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unsigned int len) |
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{ |
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unsigned int partial; |
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unsigned int done; |
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const u8 *src; |
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partial = sctx->count % SHA1_BLOCK_SIZE; |
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sctx->count += len; |
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done = 0; |
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src = data; |
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if ((partial + len) >= SHA1_BLOCK_SIZE) { |
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if (partial) { |
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done = -partial; |
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memcpy(sctx->buffer + partial, data, |
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done + SHA1_BLOCK_SIZE); |
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src = sctx->buffer; |
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} |
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do { |
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octeon_sha1_transform(src); |
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done += SHA1_BLOCK_SIZE; |
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src = data + done; |
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} while (done + SHA1_BLOCK_SIZE <= len); |
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partial = 0; |
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} |
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memcpy(sctx->buffer + partial, src, len - done); |
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} |
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static int octeon_sha1_update(struct shash_desc *desc, const u8 *data, |
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unsigned int len) |
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{ |
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struct sha1_state *sctx = shash_desc_ctx(desc); |
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struct octeon_cop2_state state; |
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unsigned long flags; |
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/* |
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* Small updates never reach the crypto engine, so the generic sha1 is |
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* faster because of the heavyweight octeon_crypto_enable() / |
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* octeon_crypto_disable(). |
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*/ |
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if ((sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE) |
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return crypto_sha1_update(desc, data, len); |
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flags = octeon_crypto_enable(&state); |
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octeon_sha1_store_hash(sctx); |
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__octeon_sha1_update(sctx, data, len); |
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octeon_sha1_read_hash(sctx); |
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octeon_crypto_disable(&state, flags); |
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return 0; |
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} |
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static int octeon_sha1_final(struct shash_desc *desc, u8 *out) |
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{ |
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struct sha1_state *sctx = shash_desc_ctx(desc); |
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static const u8 padding[64] = { 0x80, }; |
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struct octeon_cop2_state state; |
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__be32 *dst = (__be32 *)out; |
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unsigned int pad_len; |
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unsigned long flags; |
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unsigned int index; |
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__be64 bits; |
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int i; |
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/* Save number of bits. */ |
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bits = cpu_to_be64(sctx->count << 3); |
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/* Pad out to 56 mod 64. */ |
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index = sctx->count & 0x3f; |
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pad_len = (index < 56) ? (56 - index) : ((64+56) - index); |
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flags = octeon_crypto_enable(&state); |
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octeon_sha1_store_hash(sctx); |
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__octeon_sha1_update(sctx, padding, pad_len); |
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/* Append length (before padding). */ |
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__octeon_sha1_update(sctx, (const u8 *)&bits, sizeof(bits)); |
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octeon_sha1_read_hash(sctx); |
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octeon_crypto_disable(&state, flags); |
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/* Store state in digest */ |
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for (i = 0; i < 5; i++) |
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dst[i] = cpu_to_be32(sctx->state[i]); |
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/* Zeroize sensitive information. */ |
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memset(sctx, 0, sizeof(*sctx)); |
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return 0; |
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} |
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static int octeon_sha1_export(struct shash_desc *desc, void *out) |
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{ |
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struct sha1_state *sctx = shash_desc_ctx(desc); |
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memcpy(out, sctx, sizeof(*sctx)); |
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return 0; |
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} |
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static int octeon_sha1_import(struct shash_desc *desc, const void *in) |
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{ |
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struct sha1_state *sctx = shash_desc_ctx(desc); |
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memcpy(sctx, in, sizeof(*sctx)); |
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return 0; |
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} |
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static struct shash_alg octeon_sha1_alg = { |
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.digestsize = SHA1_DIGEST_SIZE, |
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.init = octeon_sha1_init, |
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.update = octeon_sha1_update, |
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.final = octeon_sha1_final, |
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.export = octeon_sha1_export, |
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.import = octeon_sha1_import, |
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.descsize = sizeof(struct sha1_state), |
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.statesize = sizeof(struct sha1_state), |
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.base = { |
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.cra_name = "sha1", |
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.cra_driver_name= "octeon-sha1", |
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.cra_priority = OCTEON_CR_OPCODE_PRIORITY, |
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.cra_blocksize = SHA1_BLOCK_SIZE, |
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.cra_module = THIS_MODULE, |
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} |
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}; |
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static int __init octeon_sha1_mod_init(void) |
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{ |
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if (!octeon_has_crypto()) |
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return -ENOTSUPP; |
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return crypto_register_shash(&octeon_sha1_alg); |
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} |
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static void __exit octeon_sha1_mod_fini(void) |
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{ |
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crypto_unregister_shash(&octeon_sha1_alg); |
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} |
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module_init(octeon_sha1_mod_init); |
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module_exit(octeon_sha1_mod_fini); |
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MODULE_LICENSE("GPL"); |
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MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm (OCTEON)"); |
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MODULE_AUTHOR("Aaro Koskinen <[email protected]>");
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