1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * sha512_base.h - core logic for SHA-512 implementations 4 * 5 * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org> 6 */ 7 8 #ifndef _CRYPTO_SHA512_BASE_H 9 #define _CRYPTO_SHA512_BASE_H 10 11 #include <crypto/internal/hash.h> 12 #include <crypto/sha2.h> 13 #include <linux/crypto.h> 14 #include <linux/module.h> 15 #include <linux/string.h> 16 17 #include <asm/unaligned.h> 18 19 typedef void (sha512_block_fn)(struct sha512_state *sst, u8 const *src, 20 int blocks); 21 22 static inline int sha384_base_init(struct shash_desc *desc) 23 { 24 struct sha512_state *sctx = shash_desc_ctx(desc); 25 26 sctx->state[0] = SHA384_H0; 27 sctx->state[1] = SHA384_H1; 28 sctx->state[2] = SHA384_H2; 29 sctx->state[3] = SHA384_H3; 30 sctx->state[4] = SHA384_H4; 31 sctx->state[5] = SHA384_H5; 32 sctx->state[6] = SHA384_H6; 33 sctx->state[7] = SHA384_H7; 34 sctx->count[0] = sctx->count[1] = 0; 35 36 return 0; 37 } 38 39 static inline int sha512_base_init(struct shash_desc *desc) 40 { 41 struct sha512_state *sctx = shash_desc_ctx(desc); 42 43 sctx->state[0] = SHA512_H0; 44 sctx->state[1] = SHA512_H1; 45 sctx->state[2] = SHA512_H2; 46 sctx->state[3] = SHA512_H3; 47 sctx->state[4] = SHA512_H4; 48 sctx->state[5] = SHA512_H5; 49 sctx->state[6] = SHA512_H6; 50 sctx->state[7] = SHA512_H7; 51 sctx->count[0] = sctx->count[1] = 0; 52 53 return 0; 54 } 55 56 static inline int sha512_base_do_update(struct shash_desc *desc, 57 const u8 *data, 58 unsigned int len, 59 sha512_block_fn *block_fn) 60 { 61 struct sha512_state *sctx = shash_desc_ctx(desc); 62 unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE; 63 64 sctx->count[0] += len; 65 if (sctx->count[0] < len) 66 sctx->count[1]++; 67 68 if (unlikely((partial + len) >= SHA512_BLOCK_SIZE)) { 69 int blocks; 70 71 if (partial) { 72 int p = SHA512_BLOCK_SIZE - partial; 73 74 memcpy(sctx->buf + partial, data, p); 75 data += p; 76 len -= p; 77 78 block_fn(sctx, sctx->buf, 1); 79 } 80 81 blocks = len / SHA512_BLOCK_SIZE; 82 len %= SHA512_BLOCK_SIZE; 83 84 if (blocks) { 85 block_fn(sctx, data, blocks); 86 data += blocks * SHA512_BLOCK_SIZE; 87 } 88 partial = 0; 89 } 90 if (len) 91 memcpy(sctx->buf + partial, data, len); 92 93 return 0; 94 } 95 96 static inline int sha512_base_do_finalize(struct shash_desc *desc, 97 sha512_block_fn *block_fn) 98 { 99 const int bit_offset = SHA512_BLOCK_SIZE - sizeof(__be64[2]); 100 struct sha512_state *sctx = shash_desc_ctx(desc); 101 __be64 *bits = (__be64 *)(sctx->buf + bit_offset); 102 unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE; 103 104 sctx->buf[partial++] = 0x80; 105 if (partial > bit_offset) { 106 memset(sctx->buf + partial, 0x0, SHA512_BLOCK_SIZE - partial); 107 partial = 0; 108 109 block_fn(sctx, sctx->buf, 1); 110 } 111 112 memset(sctx->buf + partial, 0x0, bit_offset - partial); 113 bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61); 114 bits[1] = cpu_to_be64(sctx->count[0] << 3); 115 block_fn(sctx, sctx->buf, 1); 116 117 return 0; 118 } 119 120 static inline int sha512_base_finish(struct shash_desc *desc, u8 *out) 121 { 122 unsigned int digest_size = crypto_shash_digestsize(desc->tfm); 123 struct sha512_state *sctx = shash_desc_ctx(desc); 124 __be64 *digest = (__be64 *)out; 125 int i; 126 127 for (i = 0; digest_size > 0; i++, digest_size -= sizeof(__be64)) 128 put_unaligned_be64(sctx->state[i], digest++); 129 130 memzero_explicit(sctx, sizeof(*sctx)); 131 return 0; 132 } 133 134 #endif /* _CRYPTO_SHA512_BASE_H */ 135