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/**
* \file sha2.h
* \brief SHA2 functions; not part of the OQS public API
*
* Contains the API and documentation for SHA2 digest implementation
*
* <b>Note this is not part of the OQS public API: implementations within liboqs can use these
* functions, but external consumers of liboqs should not use these functions.</b>
*
* \author Douglas Stebila
*
* SPDX-License-Identifier: MIT
*/
#ifndef OQS_SHA2_H
#define OQS_SHA2_H
#include <stddef.h>
#include <stdint.h>
#if defined(__cplusplus)
extern "C" {
#endif
/** Data structure for the state of the SHA-224 incremental hashing API. */
typedef struct {
/** Internal state */
void *ctx;
} OQS_SHA2_sha224_ctx;
/**
* \brief Process a message with SHA-256 and return the hash code in the output byte array.
*
* \warning The output array must be at least 32 bytes in length.
*
* \param output The output byte array
* \param input The message input byte array
* \param inplen The number of message bytes to process
*/
void OQS_SHA2_sha256(uint8_t *output, const uint8_t *input, size_t inplen);
/** Data structure for the state of the SHA-256 incremental hashing API. */
typedef struct {
/** Internal state */
void *ctx;
} OQS_SHA2_sha256_ctx;
/**
* \brief Allocate and initialize the state for the SHA-256 incremental hashing API.
*
* \warning The state must be released by OQS_SHA2_sha256_inc_finalize
* or OQS_SHA2_sha256_inc_ctx_release.
*
* \param state Pointer to the state
*/
void OQS_SHA2_sha256_inc_init(OQS_SHA2_sha256_ctx *state);
/**
* \brief Duplicate state for the SHA-256 incremental hashing API.
*
* \warning dest must be allocated by the caller. Caller is responsible
* for releasing dest by calling either OQS_SHA3_sha3_256_inc_finalize or
* OQS_SHA3_sha3_256_inc_ctx_release.
*
* \param dest The function state to copy into; must be initialized
* \param src The function state to copy; must be initialized
*/
void OQS_SHA2_sha256_inc_ctx_clone(OQS_SHA2_sha256_ctx *dest, const OQS_SHA2_sha256_ctx *src);
/**
* \brief Process blocks with SHA-256 and update the state.
*
* \warning The state must be initialized by OQS_SHA2_sha256_inc_init or OQS_SHA2_sha256_inc_ctx_clone.
*
* \param state The state to update
* \param in Message input byte array
* \param inblocks The number of blocks of message bytes to process
*/
void OQS_SHA2_sha256_inc_blocks(OQS_SHA2_sha256_ctx *state, const uint8_t *in, size_t inblocks);
/**
* \brief Process more message bytes with SHA-256 and return the hash code in the output byte array.
*
* \warning The output array must be at least 32 bytes in length. The state is
* deallocated by this function and can not be used again after calling
* this function without calling OQS_SHA2_sha256_inc_init again.
*
* \param out The output byte array
* \param state The state
* \param in Additional message input byte array
* \param inlen The number of additional message bytes to process
*/
void OQS_SHA2_sha256_inc_finalize(uint8_t *out, OQS_SHA2_sha256_ctx *state, const uint8_t *in, size_t inlen);
/**
* \brief Destroy state.
*
* \warning The state is deallocated by this function and can not be used again after calling
* this function without calling OQS_SHA2_sha256_inc_init again.
*
* \param state The state
*/
void OQS_SHA2_sha256_inc_ctx_release(OQS_SHA2_sha256_ctx *state);
/**
* \brief Process a message with SHA-384 and return the hash code in the output byte array.
*
* \warning The output array must be at least 48 bytes in length.
*
* \param output The output byte array
* \param input The message input byte array
* \param inplen The number of message bytes to process
*/
void OQS_SHA2_sha384(uint8_t *output, const uint8_t *input, size_t inplen);
/** Data structure for the state of the SHA-384 incremental hashing API. */
typedef struct {
/** Internal state. */
void *ctx;
} OQS_SHA2_sha384_ctx;
/**
* \brief Allocate and initialize the state for the SHA-384 incremental hashing API.
*
* \warning The state must be released by OQS_SHA2_sha384_inc_finalize
* or OQS_SHA2_sha384_inc_ctx_release.
*
* \param state Pointer to the state
*/
void OQS_SHA2_sha384_inc_init(OQS_SHA2_sha384_ctx *state);
/**
* \brief Duplicate state for the SHA-384 incremental hashing API.
*
* \warning dest must be allocated by the caller. Caller is responsible
* for releasing dest by calling either OQS_SHA3_sha3_384_inc_finalize or
* OQS_SHA3_sha3_384_inc_ctx_release.
*
* \param dest The function state to copy into; must be initialized
* \param src The function state to copy; must be initialized
*/
void OQS_SHA2_sha384_inc_ctx_clone(OQS_SHA2_sha384_ctx *dest, const OQS_SHA2_sha384_ctx *src);
/**
* \brief Process blocks with SHA-384 and update the state.
*
* \warning The state must be initialized by OQS_SHA2_sha384_inc_init or OQS_SHA2_sha384_inc_ctx_clone.
*
* \param state The state to update
* \param in Message input byte array
* \param inblocks The number of blocks of message bytes to process
*/
void OQS_SHA2_sha384_inc_blocks(OQS_SHA2_sha384_ctx *state, const uint8_t *in, size_t inblocks);
/**
* \brief Process more message bytes with SHA-384 and return the hash code in the output byte array.
*
* \warning The output array must be at least 48 bytes in length. The state is
* deallocated by this function and can not be used again after calling
* this function without calling OQS_SHA2_sha384_inc_init again.
*
* \param out The output byte array
* \param state The state
* \param in Additional message input byte array
* \param inlen The number of additional message bytes to process
*/
void OQS_SHA2_sha384_inc_finalize(uint8_t *out, OQS_SHA2_sha384_ctx *state, const uint8_t *in, size_t inlen);
/**
* \brief Destroy state.
*
* \warning The state is deallocated by this function and can not be used again after calling
* this function without calling OQS_SHA2_sha384_inc_init again.
*
* \param state The state
*/
void OQS_SHA2_sha384_inc_ctx_release(OQS_SHA2_sha384_ctx *state);
/**
* \brief Process a message with SHA-512 and return the hash code in the output byte array.
*
* \warning The output array must be at least 64 bytes in length.
*
* \param output The output byte array
* \param input The message input byte array
* \param inplen The number of message bytes to process
*/
void OQS_SHA2_sha512(uint8_t *output, const uint8_t *input, size_t inplen);
/** Data structure for the state of the SHA-512 incremental hashing API. */
typedef struct {
/** Internal state. */
void *ctx;
} OQS_SHA2_sha512_ctx;
/**
* \brief Allocate and initialize the state for the SHA-512 incremental hashing API.
*
* \warning The state must be released by OQS_SHA2_sha512_inc_finalize
* or OQS_SHA2_sha512_inc_ctx_release.
*
* \param state Pointer to the state
*/
void OQS_SHA2_sha512_inc_init(OQS_SHA2_sha512_ctx *state);
/**
* \brief Duplicate state for the SHA-512 incremental hashing API.
*
* \warning dest must be allocated by the caller. Caller is responsible
* for releasing dest by calling either OQS_SHA3_sha3_512_inc_finalize or
* OQS_SHA3_sha3_512_inc_ctx_release.
*
* \param dest The function state to copy into; must be initialized
* \param src The function state to copy; must be initialized
*/
void OQS_SHA2_sha512_inc_ctx_clone(OQS_SHA2_sha512_ctx *dest, const OQS_SHA2_sha512_ctx *src);
/**
* \brief Process blocks with SHA-512 and update the state.
*
* \warning The state must be initialized by OQS_SHA2_sha512_inc_init or OQS_SHA2_sha512_inc_ctx_clone.
*
* \param state The state to update
* \param in Message input byte array
* \param inblocks The number of blocks of message bytes to process
*/
void OQS_SHA2_sha512_inc_blocks(OQS_SHA2_sha512_ctx *state, const uint8_t *in, size_t inblocks);
/**
* \brief Process more message bytes with SHA-512 and return the hash code in the output byte array.
*
* \warning The output array must be at least 64 bytes in length. The state is
* deallocated by this function and can not be used again after calling
* this function without calling OQS_SHA2_sha512_inc_init again.
*
* \param out The output byte array
* \param state The state
* \param in Additional message input byte array
* \param inlen The number of additional message bytes to process
*/
void OQS_SHA2_sha512_inc_finalize(uint8_t *out, OQS_SHA2_sha512_ctx *state, const uint8_t *in, size_t inlen);
/**
* \brief Destroy state.
*
* \warning The state is deallocated by this function and can not be used again after calling
* this function without calling OQS_SHA2_sha512_inc_init again.
*
* \param state The state
*/
void OQS_SHA2_sha512_inc_ctx_release(OQS_SHA2_sha512_ctx *state);
#if defined(__cplusplus)
} // extern "C"
#endif
#endif // OQS_SHA2_H
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