258 lines
8.6 KiB
C
258 lines
8.6 KiB
C
/**
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* \file sha2.h
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* \brief SHA2 functions; not part of the OQS public API
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*
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* Contains the API and documentation for SHA2 digest implementation
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*
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* <b>Note this is not part of the OQS public API: implementations within liboqs can use these
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* functions, but external consumers of liboqs should not use these functions.</b>
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*
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* \author Douglas Stebila
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*
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* SPDX-License-Identifier: MIT
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*/
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#ifndef OQS_SHA2_H
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#define OQS_SHA2_H
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#include <stddef.h>
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#include <stdint.h>
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#if defined(__cplusplus)
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extern "C" {
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#endif
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/** Data structure for the state of the SHA-224 incremental hashing API. */
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typedef struct {
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/** Internal state */
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void *ctx;
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} OQS_SHA2_sha224_ctx;
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/**
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* \brief Process a message with SHA-256 and return the hash code in the output byte array.
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*
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* \warning The output array must be at least 32 bytes in length.
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*
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* \param output The output byte array
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* \param input The message input byte array
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* \param inplen The number of message bytes to process
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*/
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void OQS_SHA2_sha256(uint8_t *output, const uint8_t *input, size_t inplen);
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/** Data structure for the state of the SHA-256 incremental hashing API. */
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typedef struct {
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/** Internal state */
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void *ctx;
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} OQS_SHA2_sha256_ctx;
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/**
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* \brief Allocate and initialize the state for the SHA-256 incremental hashing API.
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*
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* \warning The state must be released by OQS_SHA2_sha256_inc_finalize
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* or OQS_SHA2_sha256_inc_ctx_release.
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*
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* \param state Pointer to the state
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*/
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void OQS_SHA2_sha256_inc_init(OQS_SHA2_sha256_ctx *state);
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/**
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* \brief Duplicate state for the SHA-256 incremental hashing API.
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*
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* \warning dest must be allocated by the caller. Caller is responsible
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* for releasing dest by calling either OQS_SHA2_sha256_inc_finalize or
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* OQS_SHA2_sha256_inc_ctx_release.
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*
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* \param dest The function state to copy into; must be initialized
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* \param src The function state to copy; must be initialized
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*/
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void OQS_SHA2_sha256_inc_ctx_clone(OQS_SHA2_sha256_ctx *dest, const OQS_SHA2_sha256_ctx *src);
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/**
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* \brief Process blocks with SHA-256 and update the state.
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*
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* \warning The state must be initialized by OQS_SHA2_sha256_inc_init or OQS_SHA2_sha256_inc_ctx_clone.
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*
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* \param state The state to update
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* \param in Message input byte array
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* \param inblocks The number of 64-byte blocks of message bytes to process
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*/
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void OQS_SHA2_sha256_inc_blocks(OQS_SHA2_sha256_ctx *state, const uint8_t *in, size_t inblocks);
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/**
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* \brief Process more message bytes with SHA-256 and return the hash code in the output byte array.
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*
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* \warning The output array must be at least 32 bytes in length. The state is
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* deallocated by this function and can not be used again after calling
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* this function without calling OQS_SHA2_sha256_inc_init again.
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*
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* \param out The output byte array
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* \param state The state
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* \param in Additional message input byte array
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* \param inlen The number of additional message bytes to process
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*/
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void OQS_SHA2_sha256_inc_finalize(uint8_t *out, OQS_SHA2_sha256_ctx *state, const uint8_t *in, size_t inlen);
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/**
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* \brief Destroy state.
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*
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* \warning The state is deallocated by this function and can not be used again after calling
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* this function without calling OQS_SHA2_sha256_inc_init again.
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*
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* \param state The state
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*/
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void OQS_SHA2_sha256_inc_ctx_release(OQS_SHA2_sha256_ctx *state);
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/**
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* \brief Process a message with SHA-384 and return the hash code in the output byte array.
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*
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* \warning The output array must be at least 48 bytes in length.
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*
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* \param output The output byte array
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* \param input The message input byte array
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* \param inplen The number of message bytes to process
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*/
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void OQS_SHA2_sha384(uint8_t *output, const uint8_t *input, size_t inplen);
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/** Data structure for the state of the SHA-384 incremental hashing API. */
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typedef struct {
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/** Internal state. */
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void *ctx;
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} OQS_SHA2_sha384_ctx;
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/**
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* \brief Allocate and initialize the state for the SHA-384 incremental hashing API.
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*
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* \warning The state must be released by OQS_SHA2_sha384_inc_finalize
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* or OQS_SHA2_sha384_inc_ctx_release.
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*
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* \param state Pointer to the state
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*/
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void OQS_SHA2_sha384_inc_init(OQS_SHA2_sha384_ctx *state);
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/**
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* \brief Duplicate state for the SHA-384 incremental hashing API.
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*
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* \warning dest must be allocated by the caller. Caller is responsible
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* for releasing dest by calling either OQS_SHA2_sha384_inc_finalize or
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* OQS_SHA2_sha384_inc_ctx_release.
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*
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* \param dest The function state to copy into; must be initialized
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* \param src The function state to copy; must be initialized
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*/
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void OQS_SHA2_sha384_inc_ctx_clone(OQS_SHA2_sha384_ctx *dest, const OQS_SHA2_sha384_ctx *src);
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/**
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* \brief Process blocks with SHA-384 and update the state.
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*
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* \warning The state must be initialized by OQS_SHA2_sha384_inc_init or OQS_SHA2_sha384_inc_ctx_clone.
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*
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* \param state The state to update
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* \param in Message input byte array
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* \param inblocks The number of 128-byte blocks of message bytes to process
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*/
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void OQS_SHA2_sha384_inc_blocks(OQS_SHA2_sha384_ctx *state, const uint8_t *in, size_t inblocks);
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/**
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* \brief Process more message bytes with SHA-384 and return the hash code in the output byte array.
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*
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* \warning The output array must be at least 48 bytes in length. The state is
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* deallocated by this function and can not be used again after calling
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* this function without calling OQS_SHA2_sha384_inc_init again.
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*
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* \param out The output byte array
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* \param state The state
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* \param in Additional message input byte array
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* \param inlen The number of additional message bytes to process
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*/
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void OQS_SHA2_sha384_inc_finalize(uint8_t *out, OQS_SHA2_sha384_ctx *state, const uint8_t *in, size_t inlen);
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/**
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* \brief Destroy state.
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*
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* \warning The state is deallocated by this function and can not be used again after calling
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* this function without calling OQS_SHA2_sha384_inc_init again.
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*
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* \param state The state
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*/
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void OQS_SHA2_sha384_inc_ctx_release(OQS_SHA2_sha384_ctx *state);
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/**
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* \brief Process a message with SHA-512 and return the hash code in the output byte array.
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*
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* \warning The output array must be at least 64 bytes in length.
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*
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* \param output The output byte array
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* \param input The message input byte array
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* \param inplen The number of message bytes to process
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*/
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void OQS_SHA2_sha512(uint8_t *output, const uint8_t *input, size_t inplen);
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/** Data structure for the state of the SHA-512 incremental hashing API. */
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typedef struct {
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/** Internal state. */
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void *ctx;
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} OQS_SHA2_sha512_ctx;
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/**
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* \brief Allocate and initialize the state for the SHA-512 incremental hashing API.
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*
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* \warning The state must be released by OQS_SHA2_sha512_inc_finalize
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* or OQS_SHA2_sha512_inc_ctx_release.
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*
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* \param state Pointer to the state
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*/
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void OQS_SHA2_sha512_inc_init(OQS_SHA2_sha512_ctx *state);
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/**
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* \brief Duplicate state for the SHA-512 incremental hashing API.
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*
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* \warning dest must be allocated by the caller. Caller is responsible
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* for releasing dest by calling either OQS_SHA2_sha512_inc_finalize or
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* OQS_SHA2_sha512_inc_ctx_release.
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*
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* \param dest The function state to copy into; must be initialized
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* \param src The function state to copy; must be initialized
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*/
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void OQS_SHA2_sha512_inc_ctx_clone(OQS_SHA2_sha512_ctx *dest, const OQS_SHA2_sha512_ctx *src);
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/**
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* \brief Process blocks with SHA-512 and update the state.
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*
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* \warning The state must be initialized by OQS_SHA2_sha512_inc_init or OQS_SHA2_sha512_inc_ctx_clone.
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*
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* \param state The state to update
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* \param in Message input byte array
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* \param inblocks The number of 128-byte blocks of message bytes to process
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*/
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void OQS_SHA2_sha512_inc_blocks(OQS_SHA2_sha512_ctx *state, const uint8_t *in, size_t inblocks);
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/**
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* \brief Process more message bytes with SHA-512 and return the hash code in the output byte array.
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*
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* \warning The output array must be at least 64 bytes in length. The state is
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* deallocated by this function and can not be used again after calling
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* this function without calling OQS_SHA2_sha512_inc_init again.
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*
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* \param out The output byte array
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* \param state The state
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* \param in Additional message input byte array
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* \param inlen The number of additional message bytes to process
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*/
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void OQS_SHA2_sha512_inc_finalize(uint8_t *out, OQS_SHA2_sha512_ctx *state, const uint8_t *in, size_t inlen);
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/**
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* \brief Destroy state.
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*
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* \warning The state is deallocated by this function and can not be used again after calling
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* this function without calling OQS_SHA2_sha512_inc_init again.
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*
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* \param state The state
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*/
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void OQS_SHA2_sha512_inc_ctx_release(OQS_SHA2_sha512_ctx *state);
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#if defined(__cplusplus)
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} // extern "C"
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#endif
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#endif // OQS_SHA2_H
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