60 lines
2.0 KiB
C
60 lines
2.0 KiB
C
/*
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* Copyright (c) 2017 Stephen Heumann
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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struct sha256_context {
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unsigned long length;
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unsigned long length2;
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unsigned short extra;
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unsigned char reserved1[50];
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unsigned char hash[32];
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unsigned char block[64];
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unsigned char reserved2[60];
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};
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/*
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* The context structure must be in bank 0, preferably page-aligned.
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*/
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/*
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* Initialize a context for SHA-256 computation.
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* An init function must be called before any of the other SHA-256 functions.
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*/
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void sha256_init(struct sha256_context *context);
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/*
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* Initialize a context for SHA-224 computation.
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* To compute a SHA-224 hash, call this function, and then call the below
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* functions as if computing a SHA-256 hash. After calling sha256_finalize,
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* the first 28 bytes of context->hash will contain the SHA-224 hash.
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*/
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void sha224_init(struct sha256_context *context);
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/*
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* Update a SHA-256 context based on the specified data.
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*/
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void sha256_update(struct sha256_context *context, const unsigned char *data, unsigned long length);
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/*
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* Finish SHA-256 processing and generate the final hash code.
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*/
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void sha256_finalize(struct sha256_context *context);
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/*
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* Process one 64-byte block through the SHA-256 hashing function.
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* This is a low-level function; users should normally not call this directly.
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*/
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void sha256_processblock(struct sha256_context *context);
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