/** @file * IPRT - Crypto - Cryptographic Hash / Message Digest. */ /* * Copyright (C) 2014-2019 Oracle Corporation * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License (GPL) as published by the Free Software * Foundation, in version 2 as it comes in the "COPYING" file of the * VirtualBox OSE distribution. VirtualBox OSE is distributed in the * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. * * The contents of this file may alternatively be used under the terms * of the Common Development and Distribution License Version 1.0 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the * VirtualBox OSE distribution, in which case the provisions of the * CDDL are applicable instead of those of the GPL. * * You may elect to license modified versions of this file under the * terms and conditions of either the GPL or the CDDL or both. */ #ifndef IPRT_INCLUDED_crypto_digest_h #define IPRT_INCLUDED_crypto_digest_h #ifndef RT_WITHOUT_PRAGMA_ONCE # pragma once #endif #include RT_C_DECLS_BEGIN /** @defgroup grp_rt_crdigest RTCrDigest - Crypographic Hash / Message Digest API. * @ingroup grp_rt * @{ */ /** * Cryptographic hash / message digest provider descriptor. * * This gives the basic details and identifiers of the algorithm as well as * function pointers to the implementation. */ typedef struct RTCRDIGESTDESC { /** The message digest provider name. */ const char *pszName; /** The object ID string. */ const char *pszObjId; /** Pointer to a NULL terminated table of alias object IDs (optional). */ const char * const *papszObjIdAliases; /** The IPRT digest type. */ RTDIGESTTYPE enmType; /** The max size of the final hash (binary). */ uint32_t cbHash; /** The size of the state. */ uint32_t cbState; /** Flags, RTCRDIGESTDESC_F_XXX. */ uint32_t fFlags; /** * Allocates the digest data. */ DECLCALLBACKMEMBER(void *, pfnNew)(void); /** * Frees the digest data. * * @param pvState The opaque message digest state. */ DECLCALLBACKMEMBER(void, pfnFree)(void *pvState); /** * Updates the digest with more data. * * @param pvState The opaque message digest state. * @param pvData The data to add to the digest. * @param cbData The amount of data to add to the digest. */ DECLCALLBACKMEMBER(void, pfnUpdate)(void *pvState, const void *pvData, size_t cbData); /** * Finalizes the digest calculation. * * @param pvState The opaque message digest state. * @param pbHash Where to store the output digest. This buffer is at * least RTCRDIGESTDESC::cbHash bytes large. */ DECLCALLBACKMEMBER(void, pfnFinal)(void *pvState, uint8_t *pbHash); /** * (Re-)Initializes the digest. Optional. * * Optional, RT_BZERO will be used if NULL. * * @returns IPRT status code. * @param pvState The opaque message digest state. * @param pvOpaque Opaque algortihm specific parameter. * @param fReInit Set if this is a re-init call. */ DECLCALLBACKMEMBER(int, pfnInit)(void *pvState, void *pvOpaque, bool fReInit); /** * Deletes the message digest state. * * Optional, memset will be used if NULL. * * @param pvState The opaque message digest state. */ DECLCALLBACKMEMBER(void, pfnDelete)(void *pvState); /** * Clones the message digest state. * * Optional, memcpy will be used if NULL. * * @returns IPRT status code. * @param pvState The opaque message digest state (destination). * @param pvSrcState The opaque message digest state to clone (source). */ DECLCALLBACKMEMBER(int, pfnClone)(void *pvState, void const *pvSrcState); /** * Gets the hash size. * * Optional, if not provided RTCRDIGESTDESC::cbHash will be returned. If * provided though, RTCRDIGESTDESC::cbHash must be set to the largest possible * hash size. * * @returns The hash size. * @param pvState The opaque message digest state. */ DECLCALLBACKMEMBER(uint32_t, pfnGetHashSize)(void *pvState); /** * Gets the digest type (when enmType is RTDIGESTTYPE_UNKNOWN). * * @returns The hash size. * @param pvState The opaque message digest state. */ DECLCALLBACKMEMBER(RTDIGESTTYPE, pfnGetDigestType)(void *pvState); } RTCRDIGESTDESC; /** Pointer to const message digest details and vtable. */ typedef RTCRDIGESTDESC const *PCRTCRDIGESTDESC; /** @name RTCRDIGESTDESC_F_XXX * @{ */ /** Digest is deprecated. */ #define RTCRDIGESTDESC_F_DEPRECATED RT_BIT_32(0) /** Digest is compromised. */ #define RTCRDIGESTDESC_F_COMPROMISED RT_BIT_32(1) /** Digest is severely compromised. */ #define RTCRDIGESTDESC_F_SERVERELY_COMPROMISED RT_BIT_32(2) /** @} */ /** * Finds a cryptographic hash / message digest descriptor by object identifier * string. * * @returns Pointer to the message digest details & vtable if found. NULL if * not found. * @param pszObjId The dotted object identifier string of the message * digest algorithm. * @param ppvOpaque Where to return an opaque implementation specfici * sub-type indicator that can be passed to * RTCrDigestCreate. This is optional, fewer * algortihms are available if not specified. */ RTDECL(PCRTCRDIGESTDESC) RTCrDigestFindByObjIdString(const char *pszObjId, void **ppvOpaque); /** * Finds a cryptographic hash / message digest descriptor by object identifier * ASN.1 object. * * @returns Pointer to the message digest details & vtable if found. NULL if * not found. * @param pObjId The ASN.1 object ID of the message digest algorithm. * @param ppvOpaque Where to return an opaque implementation specfici * sub-type indicator that can be passed to * RTCrDigestCreate. This is optional, fewer * algortihms are available if not specified. */ RTDECL(PCRTCRDIGESTDESC) RTCrDigestFindByObjId(PCRTASN1OBJID pObjId, void **ppvOpaque); RTDECL(PCRTCRDIGESTDESC) RTCrDigestFindByType(RTDIGESTTYPE enmDigestType); RTDECL(int) RTCrDigestCreateByObjIdString(PRTCRDIGEST phDigest, const char *pszObjId); RTDECL(int) RTCrDigestCreateByObjId(PRTCRDIGEST phDigest, PCRTASN1OBJID pObjId); RTDECL(int) RTCrDigestCreateByType(PRTCRDIGEST phDigest, RTDIGESTTYPE enmDigestType); /** * @returns IPRT status code. * @retval VINF_SUCCESS on success. * @retval VINF_CR_DIGEST_DEPRECATED on success from a deprecated hash algorithm. * @retval VINF_CR_DIGEST_COMPROMISED on success from a compromised hash algorithm. * @retval VINF_CR_DIGEST_SEVERELY_COMPROMISED on success from a severely compromised hash algorithm. */ RTDECL(int) RTCrDigestCreate(PRTCRDIGEST phDigest, PCRTCRDIGESTDESC pDesc, void *pvOpaque); /** * @returns IPRT status code. * @retval VINF_SUCCESS on success. * @retval VINF_CR_DIGEST_DEPRECATED on success from a deprecated hash algorithm. * @retval VINF_CR_DIGEST_COMPROMISED on success from a compromised hash algorithm. * @retval VINF_CR_DIGEST_SEVERELY_COMPROMISED on success from a severely compromised hash algorithm. */ RTDECL(int) RTCrDigestClone(PRTCRDIGEST phDigest, RTCRDIGEST hSrc); /** * Resets the digest to start calculating a new digest. */ RTDECL(int) RTCrDigestReset(RTCRDIGEST hDigest); /** * Retains a references to the digest. * * @returns New reference count. UINT32_MAX if invalid handle. * @param hDigest Handle to the digest. */ RTDECL(uint32_t) RTCrDigestRetain(RTCRDIGEST hDigest); /** * Releases a references to the digest. * * @returns New reference count. UINT32_MAX if invalid handle. * @param hDigest Handle to the digest. NIL is ignored (returns 0). */ RTDECL(uint32_t) RTCrDigestRelease(RTCRDIGEST hDigest); /** * Updates the digest with more message data. * * @returns IPRT status code. * @param hDigest Handle to the digest. * @param pvData Pointer to the message data. * @param cbData The number of bytes of data @a pvData points to. */ RTDECL(int) RTCrDigestUpdate(RTCRDIGEST hDigest, void const *pvData, size_t cbData); /** * Updates the digest with more message data from the given VFS file handle. * * @returns IPRT status code. * @param hDigest Handle to the digest. * @param hVfsFile Handle to the VFS file. * @param fRewindFile Rewind to the start of the file if @a true, start * consumption at the current file position if @a false. */ RTDECL(int) RTCrDigestUpdateFromVfsFile(RTCRDIGEST hDigest, RTVFSFILE hVfsFile, bool fRewindFile); /** * Finalizes the hash calculation, copying out the resulting hash value. * * This can be called more than once and will always return the same result. * * @returns IPRT status code. * @retval VINF_SUCCESS on success. * @retval VINF_CR_DIGEST_DEPRECATED on success from a deprecated hash algorithm. * @retval VINF_CR_DIGEST_COMPROMISED on success from a compromised hash algorithm. * @retval VINF_CR_DIGEST_SEVERELY_COMPROMISED on success from a severely compromised hash algorithm. * @retval VINF_BUFFER_UNDERFLOW if the supplied buffer is too big. * @retval VERR_BUFFER_OVERFLOW if the supplied buffer is too small. * @retval VERR_INVALID_STATE if there is nothing to finalize. * * @param hDigest The digest handle. * @param pvHash Where to return the hash. Optional. * @param cbHash The hash size. Optional. */ RTDECL(int) RTCrDigestFinal(RTCRDIGEST hDigest, void *pvHash, size_t cbHash); RTDECL(bool) RTCrDigestMatch(RTCRDIGEST hDigest, void const *pvHash, size_t cbHash); RTDECL(uint8_t const *) RTCrDigestGetHash(RTCRDIGEST hDigest); RTDECL(uint32_t) RTCrDigestGetHashSize(RTCRDIGEST hDigest); RTDECL(uint64_t) RTCrDigestGetConsumedSize(RTCRDIGEST hDigest); RTDECL(bool) RTCrDigestIsFinalized(RTCRDIGEST hDigest); RTDECL(RTDIGESTTYPE) RTCrDigestGetType(RTCRDIGEST hDigest); RTDECL(const char *) RTCrDigestGetAlgorithmOid(RTCRDIGEST hDigest); /** * Gets the flags for the algorithm. * * @returns RTCRDIGESTDESC_F_XXX, UINT32_MAX on invalid handle. * @param hDigest The digest handle. */ RTDECL(uint32_t) RTCrDigestGetFlags(RTCRDIGEST hDigest); /** * Translates an IPRT digest type value to an OID. * * @returns Dotted OID string on success, NULL if not translatable. * @param enmDigestType The IPRT digest type value to convert. */ RTDECL(const char *) RTCrDigestTypeToAlgorithmOid(RTDIGESTTYPE enmDigestType); /** * Translates an IPRT digest type value to a name/descriptive string. * * The purpose here is for human readable output rather than machine readable * output, i.e. the names aren't set in stone. * * @returns Pointer to read-only string, NULL if unknown type. * @param enmDigestType The IPRT digest type value to convert. */ RTDECL(const char *) RTCrDigestTypeToName(RTDIGESTTYPE enmDigestType); /** * Translates an IPRT digest type value to a hash size. * * @returns Hash size (in bytes). * @param enmDigestType The IPRT digest type value to convert. */ RTDECL(uint32_t) RTCrDigestTypeToHashSize(RTDIGESTTYPE enmDigestType); /** @} */ RT_C_DECLS_END #endif /* !IPRT_INCLUDED_crypto_digest_h */