/* * sha512_base.h - core logic for SHA-512 implementations * * Copyright (C) 2015 Linaro Ltd * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include #include #include #include typedef void (sha512_block_fn)(struct sha512_state *sst, u8 const *src, int blocks); static inline int sha384_base_init(struct shash_desc *desc) { struct sha512_state *sctx = shash_desc_ctx(desc); sctx->state[0] = SHA384_H0; sctx->state[1] = SHA384_H1; sctx->state[2] = SHA384_H2; sctx->state[3] = SHA384_H3; sctx->state[4] = SHA384_H4; sctx->state[5] = SHA384_H5; sctx->state[6] = SHA384_H6; sctx->state[7] = SHA384_H7; sctx->count[0] = sctx->count[1] = 0; return 0; } static inline int sha512_base_init(struct shash_desc *desc) { struct sha512_state *sctx = shash_desc_ctx(desc); sctx->state[0] = SHA512_H0; sctx->state[1] = SHA512_H1; sctx->state[2] = SHA512_H2; sctx->state[3] = SHA512_H3; sctx->state[4] = SHA512_H4; sctx->state[5] = SHA512_H5; sctx->state[6] = SHA512_H6; sctx->state[7] = SHA512_H7; sctx->count[0] = sctx->count[1] = 0; return 0; } static inline int sha512_base_do_update(struct shash_desc *desc, const u8 *data, unsigned int len, sha512_block_fn *block_fn) { struct sha512_state *sctx = shash_desc_ctx(desc); unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE; sctx->count[0] += len; if (sctx->count[0] < len) sctx->count[1]++; if (unlikely((partial + len) >= SHA512_BLOCK_SIZE)) { int blocks; if (partial) { int p = SHA512_BLOCK_SIZE - partial; memcpy(sctx->buf + partial, data, p); data += p; len -= p; block_fn(sctx, sctx->buf, 1); } blocks = len / SHA512_BLOCK_SIZE; len %= SHA512_BLOCK_SIZE; if (blocks) { block_fn(sctx, data, blocks); data += blocks * SHA512_BLOCK_SIZE; } partial = 0; } if (len) memcpy(sctx->buf + partial, data, len); return 0; } static inline int sha512_base_do_finalize(struct shash_desc *desc, sha512_block_fn *block_fn) { const int bit_offset = SHA512_BLOCK_SIZE - sizeof(__be64[2]); struct sha512_state *sctx = shash_desc_ctx(desc); __be64 *bits = (__be64 *)(sctx->buf + bit_offset); unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE; sctx->buf[partial++] = 0x80; if (partial > bit_offset) { memset(sctx->buf + partial, 0x0, SHA512_BLOCK_SIZE - partial); partial = 0; block_fn(sctx, sctx->buf, 1); } memset(sctx->buf + partial, 0x0, bit_offset - partial); bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61); bits[1] = cpu_to_be64(sctx->count[0] << 3); block_fn(sctx, sctx->buf, 1); return 0; } static inline int sha512_base_finish(struct shash_desc *desc, u8 *out) { unsigned int digest_size = crypto_shash_digestsize(desc->tfm); struct sha512_state *sctx = shash_desc_ctx(desc); __be64 *digest = (__be64 *)out; int i; for (i = 0; digest_size > 0; i++, digest_size -= sizeof(__be64)) put_unaligned_be64(sctx->state[i], digest++); *sctx = (struct sha512_state){}; return 0; } 355'>dt-bindings/clock
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