include/crypto/sha512_base.h

0001 /* SPDX-License-Identifier: GPL-2.0-only */
0002 /*
0003  * sha512_base.h - core logic for SHA-512 implementations
0004  *
0005  * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
0006  */
0007
0008 #ifndef _CRYPTO_SHA512_BASE_H
0009 #define _CRYPTO_SHA512_BASE_H
0010
0011 #include <crypto/internal/hash.h>
0012 #include <crypto/sha2.h>
0013 #include <linux/crypto.h>
0014 #include <linux/module.h>
0015 #include <linux/string.h>
0016
0017 #include <asm/unaligned.h>
0018
0019 typedef void (sha512_block_fn)(struct sha512_state *sst, u8 const *src,
0020                    int blocks);
0021
0022 static inline int sha384_base_init(struct shash_desc *desc)
0023 {
0024     struct sha512_state *sctx = shash_desc_ctx(desc);
0025
0026     sctx->state[0] = SHA384_H0;
0027     sctx->state[1] = SHA384_H1;
0028     sctx->state[2] = SHA384_H2;
0029     sctx->state[3] = SHA384_H3;
0030     sctx->state[4] = SHA384_H4;
0031     sctx->state[5] = SHA384_H5;
0032     sctx->state[6] = SHA384_H6;
0033     sctx->state[7] = SHA384_H7;
0034     sctx->count[0] = sctx->count[1] = 0;
0035
0036     return 0;
0037 }
0038
0039 static inline int sha512_base_init(struct shash_desc *desc)
0040 {
0041     struct sha512_state *sctx = shash_desc_ctx(desc);
0042
0043     sctx->state[0] = SHA512_H0;
0044     sctx->state[1] = SHA512_H1;
0045     sctx->state[2] = SHA512_H2;
0046     sctx->state[3] = SHA512_H3;
0047     sctx->state[4] = SHA512_H4;
0048     sctx->state[5] = SHA512_H5;
0049     sctx->state[6] = SHA512_H6;
0050     sctx->state[7] = SHA512_H7;
0051     sctx->count[0] = sctx->count[1] = 0;
0052
0053     return 0;
0054 }
0055
0056 static inline int sha512_base_do_update(struct shash_desc *desc,
0057                     const u8 *data,
0058                     unsigned int len,
0059                     sha512_block_fn *block_fn)
0060 {
0061     struct sha512_state *sctx = shash_desc_ctx(desc);
0062     unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE;
0063
0064     sctx->count[0] += len;
0065     if (sctx->count[0] < len)
0066         sctx->count[1]++;
0067
0068     if (unlikely((partial + len) >= SHA512_BLOCK_SIZE)) {
0069         int blocks;
0070
0071         if (partial) {
0072             int p = SHA512_BLOCK_SIZE - partial;
0073
0074             memcpy(sctx->buf + partial, data, p);
0075             data += p;
0076             len -= p;
0077
0078             block_fn(sctx, sctx->buf, 1);
0079         }
0080
0081         blocks = len / SHA512_BLOCK_SIZE;
0082         len %= SHA512_BLOCK_SIZE;
0083
0084         if (blocks) {
0085             block_fn(sctx, data, blocks);
0086             data += blocks * SHA512_BLOCK_SIZE;
0087         }
0088         partial = 0;
0089     }
0090     if (len)
0091         memcpy(sctx->buf + partial, data, len);
0092
0093     return 0;
0094 }
0095
0096 static inline int sha512_base_do_finalize(struct shash_desc *desc,
0097                       sha512_block_fn *block_fn)
0098 {
0099     const int bit_offset = SHA512_BLOCK_SIZE - sizeof(__be64[2]);
0100     struct sha512_state *sctx = shash_desc_ctx(desc);
0101     __be64 *bits = (__be64 *)(sctx->buf + bit_offset);
0102     unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE;
0103
0104     sctx->buf[partial++] = 0x80;
0105     if (partial > bit_offset) {
0106         memset(sctx->buf + partial, 0x0, SHA512_BLOCK_SIZE - partial);
0107         partial = 0;
0108
0109         block_fn(sctx, sctx->buf, 1);
0110     }
0111
0112     memset(sctx->buf + partial, 0x0, bit_offset - partial);
0113     bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61);
0114     bits[1] = cpu_to_be64(sctx->count[0] << 3);
0115     block_fn(sctx, sctx->buf, 1);
0116
0117     return 0;
0118 }
0119
0120 static inline int sha512_base_finish(struct shash_desc *desc, u8 *out)
0121 {
0122     unsigned int digest_size = crypto_shash_digestsize(desc->tfm);
0123     struct sha512_state *sctx = shash_desc_ctx(desc);
0124     __be64 *digest = (__be64 *)out;
0125     int i;
0126
0127     for (i = 0; digest_size > 0; i++, digest_size -= sizeof(__be64))
0128         put_unaligned_be64(sctx->state[i], digest++);
0129
0130     memzero_explicit(sctx, sizeof(*sctx));
0131     return 0;
0132 }
0133
0134 #endif /* _CRYPTO_SHA512_BASE_H */