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71 lines
2.5 KiB
C
71 lines
2.5 KiB
C
/* $OpenBSD: digest.h,v 1.8 2017/05/08 22:57:38 djm Exp $ */
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/*
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* Copyright (c) 2013 Damien Miller <djm@mindrot.org>
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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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#ifndef _DIGEST_H
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#define _DIGEST_H
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/* Maximum digest output length */
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#define SSH_DIGEST_MAX_LENGTH 64
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/* Digest algorithms */
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#define SSH_DIGEST_MD5 0
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#define SSH_DIGEST_SHA1 1
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#define SSH_DIGEST_SHA256 2
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#define SSH_DIGEST_SHA384 3
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#define SSH_DIGEST_SHA512 4
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#define SSH_DIGEST_MAX 5
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struct sshbuf;
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struct ssh_digest_ctx;
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/* Looks up a digest algorithm by name */
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int ssh_digest_alg_by_name(const char *name);
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/* Returns the algorithm name for a digest identifier */
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const char *ssh_digest_alg_name(int alg);
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/* Returns the algorithm's digest length in bytes or 0 for invalid algorithm */
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size_t ssh_digest_bytes(int alg);
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/* Returns the block size of the digest, e.g. for implementing HMAC */
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size_t ssh_digest_blocksize(struct ssh_digest_ctx *ctx);
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/* Copies internal state of digest of 'from' to 'to' */
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int ssh_digest_copy_state(struct ssh_digest_ctx *from,
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struct ssh_digest_ctx *to);
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/* One-shot API */
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int ssh_digest_memory(int alg, const void *m, size_t mlen,
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u_char *d, size_t dlen)
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__attribute__((__bounded__(__buffer__, 2, 3)))
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__attribute__((__bounded__(__buffer__, 4, 5)));
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int ssh_digest_buffer(int alg, const struct sshbuf *b, u_char *d, size_t dlen)
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__attribute__((__bounded__(__buffer__, 3, 4)));
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/* Update API */
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struct ssh_digest_ctx *ssh_digest_start(int alg);
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int ssh_digest_update(struct ssh_digest_ctx *ctx, const void *m, size_t mlen)
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__attribute__((__bounded__(__buffer__, 2, 3)));
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int ssh_digest_update_buffer(struct ssh_digest_ctx *ctx,
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const struct sshbuf *b);
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int ssh_digest_final(struct ssh_digest_ctx *ctx, u_char *d, size_t dlen)
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__attribute__((__bounded__(__buffer__, 2, 3)));
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void ssh_digest_free(struct ssh_digest_ctx *ctx);
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#endif /* _DIGEST_H */
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