71 lines
2.0 KiB
C
71 lines
2.0 KiB
C
/*
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* cifra - embedded cryptography library
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* Written in 2014 by Joseph Birr-Pixton <jpixton@gmail.com>
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*
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* To the extent possible under law, the author(s) have dedicated all
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* copyright and related and neighboring rights to this software to the
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* public domain worldwide. This software is distributed without any
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* warranty.
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*
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* You should have received a copy of the CC0 Public Domain Dedication
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* along with this software. If not, see
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* <http://creativecommons.org/publicdomain/zero/1.0/>.
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*/
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#ifndef SHA2_H
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#define SHA2_H
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#include <stddef.h>
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#include <stdint.h>
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/* .. c:macro:: CF_SHA256_HASHSZ
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* The output size of SHA256: 32 bytes. */
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#define CF_SHA256_HASHSZ 32
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/* .. c:macro:: CF_SHA256_BLOCKSZ
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* The block size of SHA256: 64 bytes. */
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#define CF_SHA256_BLOCKSZ 64
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/* .. c:type:: cf_sha256_context
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* Incremental SHA256 hashing context.
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*
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* .. c:member:: cf_sha256_context.H
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* Intermediate values.
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*
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* .. c:member:: cf_sha256_context.partial
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* Unprocessed input.
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*
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* .. c:member:: cf_sha256_context.npartial
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* Number of bytes of unprocessed input.
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*
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* .. c:member:: cf_sha256_context.blocks
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* Number of full blocks processed.
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*/
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typedef struct
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{
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uint32_t H[8]; /* State. */
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uint8_t partial[CF_SHA256_BLOCKSZ]; /* Partial block of input. */
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uint32_t blocks; /* Number of full blocks processed into H. */
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size_t npartial; /* Number of bytes in prefix of partial. */
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} cf_sha256_context;
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/* .. c:function:: $DECL
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* Sets up `ctx` ready to hash a new message.
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*/
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extern void cf_sha256_init(cf_sha256_context *ctx);
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/* .. c:function:: $DECL
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* Hashes `nbytes` at `data`. Copies the data if there isn't enough to make
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* a full block.
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*/
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extern void cf_sha256_update(cf_sha256_context *ctx, const void *data, size_t nbytes);
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/* .. c:function:: $DECL
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* Finishes the hash operation, writing `CF_SHA256_HASHSZ` bytes to `hash`.
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*
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* This destroys `ctx`.
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*/
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extern void cf_sha256_digest(cf_sha256_context *ctx, uint8_t hash[CF_SHA256_HASHSZ]);
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#endif
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