183 lines
6.7 KiB
C
183 lines
6.7 KiB
C
/*
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* Interface declarations for Skein hashing.
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* Source code author: Doug Whiting, 2008.
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* This algorithm and source code is released to the public domain.
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*
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* The following compile-time switches may be defined to control some
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* tradeoffs between speed, code size, error checking, and security.
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*
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* The "default" note explains what happens when the switch is not defined.
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*
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* SKEIN_DEBUG -- make callouts from inside Skein code
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* to examine/display intermediate values.
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* [default: no callouts (no overhead)]
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*
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* SKEIN_ERR_CHECK -- how error checking is handled inside Skein
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* code. If not defined, most error checking
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* is disabled (for performance). Otherwise,
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* the switch value is interpreted as:
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* 0: use assert() to flag errors
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* 1: return SKEIN_FAIL to flag errors
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*/
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/* Copyright 2013 Doug Whiting. This code is released to the public domain. */
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#ifndef _SYS_SKEIN_H_
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#define _SYS_SKEIN_H_
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#ifdef _KERNEL
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#include <sys/types.h> /* get size_t definition */
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#else
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#include <stdint.h>
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#include <stdlib.h>
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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enum {
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SKEIN_SUCCESS = 0, /* return codes from Skein calls */
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SKEIN_FAIL = 1,
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SKEIN_BAD_HASHLEN = 2
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};
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#define SKEIN_MODIFIER_WORDS (2) /* number of modifier (tweak) words */
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#define SKEIN_256_STATE_WORDS (4)
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#define SKEIN_512_STATE_WORDS (8)
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#define SKEIN1024_STATE_WORDS (16)
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#define SKEIN_MAX_STATE_WORDS (16)
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#define SKEIN_256_STATE_BYTES (8 * SKEIN_256_STATE_WORDS)
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#define SKEIN_512_STATE_BYTES (8 * SKEIN_512_STATE_WORDS)
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#define SKEIN1024_STATE_BYTES (8 * SKEIN1024_STATE_WORDS)
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#define SKEIN_256_STATE_BITS (64 * SKEIN_256_STATE_WORDS)
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#define SKEIN_512_STATE_BITS (64 * SKEIN_512_STATE_WORDS)
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#define SKEIN1024_STATE_BITS (64 * SKEIN1024_STATE_WORDS)
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#define SKEIN_256_BLOCK_BYTES (8 * SKEIN_256_STATE_WORDS)
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#define SKEIN_512_BLOCK_BYTES (8 * SKEIN_512_STATE_WORDS)
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#define SKEIN1024_BLOCK_BYTES (8 * SKEIN1024_STATE_WORDS)
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typedef struct {
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size_t hashBitLen; /* size of hash result, in bits */
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size_t bCnt; /* current byte count in buffer b[] */
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/* tweak words: T[0]=byte cnt, T[1]=flags */
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uint64_t T[SKEIN_MODIFIER_WORDS];
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} Skein_Ctxt_Hdr_t;
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typedef struct { /* 256-bit Skein hash context structure */
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Skein_Ctxt_Hdr_t h; /* common header context variables */
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uint64_t X[SKEIN_256_STATE_WORDS]; /* chaining variables */
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/* partial block buffer (8-byte aligned) */
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uint8_t b[SKEIN_256_BLOCK_BYTES];
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} Skein_256_Ctxt_t;
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typedef struct { /* 512-bit Skein hash context structure */
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Skein_Ctxt_Hdr_t h; /* common header context variables */
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uint64_t X[SKEIN_512_STATE_WORDS]; /* chaining variables */
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/* partial block buffer (8-byte aligned) */
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uint8_t b[SKEIN_512_BLOCK_BYTES];
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} Skein_512_Ctxt_t;
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typedef struct { /* 1024-bit Skein hash context structure */
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Skein_Ctxt_Hdr_t h; /* common header context variables */
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uint64_t X[SKEIN1024_STATE_WORDS]; /* chaining variables */
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/* partial block buffer (8-byte aligned) */
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uint8_t b[SKEIN1024_BLOCK_BYTES];
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} Skein1024_Ctxt_t;
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/* Skein APIs for (incremental) "straight hashing" */
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int Skein_256_Init(Skein_256_Ctxt_t *ctx, size_t hashBitLen);
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int Skein_512_Init(Skein_512_Ctxt_t *ctx, size_t hashBitLen);
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int Skein1024_Init(Skein1024_Ctxt_t *ctx, size_t hashBitLen);
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int Skein_256_Update(Skein_256_Ctxt_t *ctx, const uint8_t *msg,
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size_t msgByteCnt);
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int Skein_512_Update(Skein_512_Ctxt_t *ctx, const uint8_t *msg,
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size_t msgByteCnt);
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int Skein1024_Update(Skein1024_Ctxt_t *ctx, const uint8_t *msg,
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size_t msgByteCnt);
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int Skein_256_Final(Skein_256_Ctxt_t *ctx, uint8_t *hashVal);
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int Skein_512_Final(Skein_512_Ctxt_t *ctx, uint8_t *hashVal);
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int Skein1024_Final(Skein1024_Ctxt_t *ctx, uint8_t *hashVal);
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/*
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* Skein APIs for "extended" initialization: MAC keys, tree hashing.
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* After an InitExt() call, just use Update/Final calls as with Init().
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*
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* Notes: Same parameters as _Init() calls, plus treeInfo/key/keyBytes.
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* When keyBytes == 0 and treeInfo == SKEIN_SEQUENTIAL,
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* the results of InitExt() are identical to calling Init().
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* The function Init() may be called once to "precompute" the IV for
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* a given hashBitLen value, then by saving a copy of the context
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* the IV computation may be avoided in later calls.
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* Similarly, the function InitExt() may be called once per MAC key
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* to precompute the MAC IV, then a copy of the context saved and
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* reused for each new MAC computation.
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*/
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int Skein_256_InitExt(Skein_256_Ctxt_t *ctx, size_t hashBitLen,
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uint64_t treeInfo, const uint8_t *key, size_t keyBytes);
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int Skein_512_InitExt(Skein_512_Ctxt_t *ctx, size_t hashBitLen,
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uint64_t treeInfo, const uint8_t *key, size_t keyBytes);
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int Skein1024_InitExt(Skein1024_Ctxt_t *ctx, size_t hashBitLen,
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uint64_t treeInfo, const uint8_t *key, size_t keyBytes);
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/*
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* Skein APIs for MAC and tree hash:
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* Final_Pad: pad, do final block, but no OUTPUT type
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* Output: do just the output stage
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*/
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int Skein_256_Final_Pad(Skein_256_Ctxt_t *ctx, uint8_t *hashVal);
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int Skein_512_Final_Pad(Skein_512_Ctxt_t *ctx, uint8_t *hashVal);
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int Skein1024_Final_Pad(Skein1024_Ctxt_t *ctx, uint8_t *hashVal);
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#ifndef SKEIN_TREE_HASH
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#define SKEIN_TREE_HASH (1)
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#endif
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#if SKEIN_TREE_HASH
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int Skein_256_Output(Skein_256_Ctxt_t *ctx, uint8_t *hashVal);
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int Skein_512_Output(Skein_512_Ctxt_t *ctx, uint8_t *hashVal);
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int Skein1024_Output(Skein1024_Ctxt_t *ctx, uint8_t *hashVal);
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#endif
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/*
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* When you initialize a Skein KCF hashing method you can pass this param
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* structure in cm_param to fine-tune the algorithm's defaults.
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*/
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typedef struct skein_param {
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size_t sp_digest_bitlen; /* length of digest in bits */
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} skein_param_t;
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/* Module definitions */
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#ifdef SKEIN_MODULE_IMPL
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#define CKM_SKEIN_256 "CKM_SKEIN_256"
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#define CKM_SKEIN_512 "CKM_SKEIN_512"
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#define CKM_SKEIN1024 "CKM_SKEIN1024"
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#define CKM_SKEIN_256_MAC "CKM_SKEIN_256_MAC"
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#define CKM_SKEIN_512_MAC "CKM_SKEIN_512_MAC"
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#define CKM_SKEIN1024_MAC "CKM_SKEIN1024_MAC"
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typedef enum skein_mech_type {
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SKEIN_256_MECH_INFO_TYPE,
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SKEIN_512_MECH_INFO_TYPE,
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SKEIN1024_MECH_INFO_TYPE,
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SKEIN_256_MAC_MECH_INFO_TYPE,
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SKEIN_512_MAC_MECH_INFO_TYPE,
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SKEIN1024_MAC_MECH_INFO_TYPE
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} skein_mech_type_t;
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#define VALID_SKEIN_DIGEST_MECH(__mech) \
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((int)(__mech) >= SKEIN_256_MECH_INFO_TYPE && \
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(__mech) <= SKEIN1024_MECH_INFO_TYPE)
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#define VALID_SKEIN_MAC_MECH(__mech) \
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((int)(__mech) >= SKEIN_256_MAC_MECH_INFO_TYPE && \
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(__mech) <= SKEIN1024_MAC_MECH_INFO_TYPE)
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#endif /* SKEIN_MODULE_IMPL */
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_SKEIN_H_ */
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