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158 lines
3.5 KiB
158 lines
3.5 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Glue code for MD5 implementation for PPC assembler |
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* |
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* Based on generic implementation. |
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* |
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* Copyright (c) 2015 Markus Stockhausen <[email protected]> |
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*/ |
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#include <crypto/internal/hash.h> |
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#include <linux/init.h> |
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#include <linux/module.h> |
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#include <linux/mm.h> |
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#include <linux/types.h> |
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#include <crypto/md5.h> |
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#include <asm/byteorder.h> |
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extern void ppc_md5_transform(u32 *state, const u8 *src, u32 blocks); |
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static inline void ppc_md5_clear_context(struct md5_state *sctx) |
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{ |
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int count = sizeof(struct md5_state) >> 2; |
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u32 *ptr = (u32 *)sctx; |
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/* make sure we can clear the fast way */ |
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BUILD_BUG_ON(sizeof(struct md5_state) % 4); |
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do { *ptr++ = 0; } while (--count); |
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} |
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static int ppc_md5_init(struct shash_desc *desc) |
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{ |
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struct md5_state *sctx = shash_desc_ctx(desc); |
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sctx->hash[0] = MD5_H0; |
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sctx->hash[1] = MD5_H1; |
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sctx->hash[2] = MD5_H2; |
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sctx->hash[3] = MD5_H3; |
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sctx->byte_count = 0; |
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return 0; |
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} |
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static int ppc_md5_update(struct shash_desc *desc, const u8 *data, |
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unsigned int len) |
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{ |
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struct md5_state *sctx = shash_desc_ctx(desc); |
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const unsigned int offset = sctx->byte_count & 0x3f; |
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unsigned int avail = 64 - offset; |
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const u8 *src = data; |
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sctx->byte_count += len; |
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if (avail > len) { |
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memcpy((char *)sctx->block + offset, src, len); |
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return 0; |
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} |
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if (offset) { |
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memcpy((char *)sctx->block + offset, src, avail); |
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ppc_md5_transform(sctx->hash, (const u8 *)sctx->block, 1); |
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len -= avail; |
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src += avail; |
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} |
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if (len > 63) { |
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ppc_md5_transform(sctx->hash, src, len >> 6); |
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src += len & ~0x3f; |
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len &= 0x3f; |
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} |
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memcpy((char *)sctx->block, src, len); |
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return 0; |
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} |
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static int ppc_md5_final(struct shash_desc *desc, u8 *out) |
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{ |
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struct md5_state *sctx = shash_desc_ctx(desc); |
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const unsigned int offset = sctx->byte_count & 0x3f; |
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const u8 *src = (const u8 *)sctx->block; |
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u8 *p = (u8 *)src + offset; |
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int padlen = 55 - offset; |
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__le64 *pbits = (__le64 *)((char *)sctx->block + 56); |
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__le32 *dst = (__le32 *)out; |
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*p++ = 0x80; |
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if (padlen < 0) { |
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memset(p, 0x00, padlen + sizeof (u64)); |
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ppc_md5_transform(sctx->hash, src, 1); |
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p = (char *)sctx->block; |
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padlen = 56; |
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} |
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memset(p, 0, padlen); |
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*pbits = cpu_to_le64(sctx->byte_count << 3); |
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ppc_md5_transform(sctx->hash, src, 1); |
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dst[0] = cpu_to_le32(sctx->hash[0]); |
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dst[1] = cpu_to_le32(sctx->hash[1]); |
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dst[2] = cpu_to_le32(sctx->hash[2]); |
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dst[3] = cpu_to_le32(sctx->hash[3]); |
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ppc_md5_clear_context(sctx); |
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return 0; |
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} |
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static int ppc_md5_export(struct shash_desc *desc, void *out) |
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{ |
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struct md5_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 ppc_md5_import(struct shash_desc *desc, const void *in) |
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{ |
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struct md5_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 alg = { |
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.digestsize = MD5_DIGEST_SIZE, |
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.init = ppc_md5_init, |
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.update = ppc_md5_update, |
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.final = ppc_md5_final, |
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.export = ppc_md5_export, |
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.import = ppc_md5_import, |
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.descsize = sizeof(struct md5_state), |
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.statesize = sizeof(struct md5_state), |
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.base = { |
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.cra_name = "md5", |
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.cra_driver_name= "md5-ppc", |
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.cra_priority = 200, |
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.cra_blocksize = MD5_HMAC_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 ppc_md5_mod_init(void) |
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{ |
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return crypto_register_shash(&alg); |
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} |
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static void __exit ppc_md5_mod_fini(void) |
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{ |
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crypto_unregister_shash(&alg); |
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} |
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module_init(ppc_md5_mod_init); |
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module_exit(ppc_md5_mod_fini); |
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MODULE_LICENSE("GPL"); |
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MODULE_DESCRIPTION("MD5 Secure Hash Algorithm, PPC assembler"); |
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MODULE_ALIAS_CRYPTO("md5"); |
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MODULE_ALIAS_CRYPTO("md5-ppc");
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