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Diffstat (limited to 'web/server/h2o/libh2o/deps/picotls/deps/cifra/src/hmac.h')
-rw-r--r-- | web/server/h2o/libh2o/deps/picotls/deps/cifra/src/hmac.h | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/web/server/h2o/libh2o/deps/picotls/deps/cifra/src/hmac.h b/web/server/h2o/libh2o/deps/picotls/deps/cifra/src/hmac.h new file mode 100644 index 000000000..2f9ea7b04 --- /dev/null +++ b/web/server/h2o/libh2o/deps/picotls/deps/cifra/src/hmac.h @@ -0,0 +1,78 @@ +/* + * cifra - embedded cryptography library + * Written in 2014 by Joseph Birr-Pixton <jpixton@gmail.com> + * + * To the extent possible under law, the author(s) have dedicated all + * copyright and related and neighboring rights to this software to the + * public domain worldwide. This software is distributed without any + * warranty. + * + * You should have received a copy of the CC0 Public Domain Dedication + * along with this software. If not, see + * <http://creativecommons.org/publicdomain/zero/1.0/>. + */ + +#ifndef HMAC_H +#define HMAC_H + +#include <stddef.h> +#include <stdint.h> + +#include "chash.h" + +/** + * HMAC + * ==== + * This is a one-shot and incremental interface to computing + * HMAC with any hash function. + * + * (Note: HMAC with SHA3 is possible, but is probably not a + * sensible thing to want.) + */ + +/* .. c:type:: cf_hmac_ctx + * HMAC incremental interface context. + * + * .. c:member:: cf_hmac_ctx.hash + * Hash function description. + * + * .. c:member:: cf_hmac_ctx.inner + * Inner hash computation. + * + * .. c:member:: cf_hmac_ctx.outer + * Outer hash computation. + */ +typedef struct +{ + const cf_chash *hash; + cf_chash_ctx inner; + cf_chash_ctx outer; +} cf_hmac_ctx; + +/* .. c:function:: $DECL + * Set up ctx for computing a HMAC using the given hash and key. */ +void cf_hmac_init(cf_hmac_ctx *ctx, + const cf_chash *hash, + const uint8_t *key, size_t nkey); + +/* .. c:function:: $DECL + * Input data. */ +void cf_hmac_update(cf_hmac_ctx *ctx, + const void *data, size_t ndata); + +/* .. c:function:: $DECL + * Finish and compute HMAC. + * `ctx->hash->hashsz` bytes are written to `out`. */ +void cf_hmac_finish(cf_hmac_ctx *ctx, uint8_t *out); + +/* .. c:function:: $DECL + * One shot interface: compute `HMAC_hash(key, msg)`, writing the + * answer (which is `hash->hashsz` long) to `out`. + * + * This function does not fail. */ +void cf_hmac(const uint8_t *key, size_t nkey, + const uint8_t *msg, size_t nmsg, + uint8_t *out, + const cf_chash *hash); + +#endif |