To reduce the number of copies of boilerplate code throughout the tree, this patch implements generic glue for the SHA-512 algorithm. This allows a specific arch or hardware implementation to only implement the special handling that it needs.
Signed-off-by: Ard Biesheuvel <ard.biesheu...@linaro.org> --- include/crypto/sha512_base.h | 147 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 147 insertions(+) create mode 100644 include/crypto/sha512_base.h diff --git a/include/crypto/sha512_base.h b/include/crypto/sha512_base.h new file mode 100644 index 000000000000..44351f781dce --- /dev/null +++ b/include/crypto/sha512_base.h @@ -0,0 +1,147 @@ +/* + * sha512_base.h - core logic for SHA-512 implementations + * + * Copyright (C) 2015 Linaro Ltd <ard.biesheu...@linaro.org> + * + * 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 <crypto/internal/hash.h> +#include <crypto/sha.h> +#include <linux/crypto.h> +#include <linux/module.h> + +#include <asm/unaligned.h> + +typedef void (sha512_block_fn)(int blocks, u8 const *src, u64 *state, + const u8 *head, void *p); + +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_export(struct shash_desc *desc, void *out) +{ + struct sha512_state *sctx = shash_desc_ctx(desc); + struct sha512_state *dst = out; + + *dst = *sctx; + + return 0; +} + +static inline int sha512_base_import(struct shash_desc *desc, const void *in) +{ + struct sha512_state *sctx = shash_desc_ctx(desc); + struct sha512_state const *src = in; + + *sctx = *src; + + return 0; +} + +static inline int sha512_base_do_update(struct shash_desc *desc, const u8 *data, + unsigned int len, + sha512_block_fn *block_fn, void *p) +{ + 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; + } + + blocks = len / SHA512_BLOCK_SIZE; + len %= SHA512_BLOCK_SIZE; + + block_fn(blocks, data, sctx->state, + partial ? sctx->buf : NULL, p); + 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, void *p) +{ + 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(1, sctx->buf, sctx->state, NULL, p); + } + + 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(1, sctx->buf, sctx->state, NULL, p); + + 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; +} -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html