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#ifndef PP_CRYPT_H
#define PP_CRYPT_H
#include "ppfilter.h"
#include "utilcrypt.h"
#include "utilcryptdef.h"
#define PPCRYPT_MAX_PASSWORD 127
#define PPCRYPT_MAX_KEY 32
typedef struct {
ppuint algorithm_variant; /* /V entry of encrypt dict */
ppuint algorithm_revision; /* /R entry of encrypt dict */
ppint permissions; /* /P entry of encrypt dict */
ppdict *map; /* /CF filters map of encrypt dict */
uint8_t userpass[PPCRYPT_MAX_PASSWORD]; /* user password */
size_t userpasslength; /* user password length */
uint8_t ownerpass[PPCRYPT_MAX_PASSWORD]; /* owner password */
size_t ownerpasslength; /* owner password length */
uint8_t filekey[PPCRYPT_MAX_KEY+5+4]; /* file key with an extra space for salt */
size_t filekeylength; /* key length; usually 5, 16 or 32 bytes */
uint8_t cryptkey[PPCRYPT_MAX_KEY]; /* crypt key for a recent reference */
size_t cryptkeylength; /* crypt key length; usually keylength + 5 */
//ppstring *cryptkeystring; /* todo: cached cryptkey string for V5, where all refs has the same */
ppref *ref; /* recent reference */
union { /* cached crypt states for strings encrypted/decrypted with the same key */
struct {
rc4_state rc4state;
rc4_map rc4map;
rc4_map rc4copy;
};
struct {
aes_state aesstate;
aes_keyblock aeskeyblock;
uint8_t ivcopy[16];
};
};
int flags;
} ppcrypt;
#define PPCRYPT_NO_METADATA (1<<0)
#define PPCRYPT_USER_PASSWORD (1<<1)
#define PPCRYPT_OWNER_PASSWORD (1<<2)
#define PPCRYPT_STREAM_RC4 (1<<3)
#define PPCRYPT_STRING_RC4 (1<<4)
#define PPCRYPT_STREAM_AES (1<<5)
#define PPCRYPT_STRING_AES (1<<6)
#define PPCRYPT_STREAM (PPCRYPT_STREAM_AES|PPCRYPT_STREAM_RC4)
#define PPCRYPT_STRING (PPCRYPT_STRING_AES|PPCRYPT_STRING_RC4)
#define PPCRYPT_RC4 (PPCRYPT_STREAM_RC4|PPCRYPT_STRING_RC4)
#define PPCRYPT_AES (PPCRYPT_STREAM_AES|PPCRYPT_STRING_AES)
#define PPCRYPT_INFO_AES (1<<0)
#define PPCRYPT_INFO_RC4 (1<<1)
#define PPCRYPT_INFO_MD (1<<2)
#define PPCRYPT_INFO_NOMD (1<<3)
ppcrypt_status ppdoc_crypt_init (ppdoc *pdf, const void *userpass, size_t userpasslength, const void *ownerpass, size_t ownerpasslength);
int ppstring_decrypt (ppcrypt *crypt, const void *input, size_t size, void *output, size_t *newsize);
#define ppcrypt_start_ref(crypt, r) ((crypt)->ref = r, (crypt)->cryptkeylength = 0)
#define ppcrypt_end_ref(crypt) ((crypt)->ref = NULL, (crypt)->cryptkeylength = 0)
#define ppcrypt_ref(pdf, crypt) ((crypt = (pdf)->crypt) != NULL && crypt->ref != NULL)
int ppcrypt_type (ppcrypt *crypt, ppname *cryptname, ppuint *length, int *cryptflags);
ppstring * ppcrypt_stmkey (ppcrypt *crypt, ppref *ref, int aes, ppheap *heap);
#endif
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