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include/mupdf/fitz/crypt.h

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+#ifndef MUPDF_FITZ_CRYPT_H
+#define MUPDF_FITZ_CRYPT_H
+
+#include "mupdf/fitz/system.h"
+
+/*
+ * Basic crypto functions.
+ * Independent of the rest of fitz.
+ * For further encapsulation in filters, or not.
+ */
+
+/* md5 digests */
+
+typedef struct fz_md5_s fz_md5;
+
+/*
+	Structure definition is public to enable stack
+	based allocation. Do not access the members directly.
+*/
+struct fz_md5_s
+{
+	unsigned int state[4];
+	unsigned int count[2];
+	unsigned char buffer[64];
+};
+
+void fz_md5_init(fz_md5 *state);
+void fz_md5_update(fz_md5 *state, const unsigned char *input, size_t inlen);
+void fz_md5_final(fz_md5 *state, unsigned char digest[16]);
+
+/* sha-256 digests */
+
+typedef struct fz_sha256_s fz_sha256;
+
+/*
+	Structure definition is public to enable stack
+	based allocation. Do not access the members directly.
+*/
+struct fz_sha256_s
+{
+	unsigned int state[8];
+	unsigned int count[2];
+	union {
+		unsigned char u8[64];
+		unsigned int u32[16];
+	} buffer;
+};
+
+void fz_sha256_init(fz_sha256 *state);
+void fz_sha256_update(fz_sha256 *state, const unsigned char *input, size_t inlen);
+void fz_sha256_final(fz_sha256 *state, unsigned char digest[32]);
+
+/* sha-512 digests */
+
+typedef struct fz_sha512_s fz_sha512;
+
+/*
+	Structure definition is public to enable stack
+	based allocation. Do not access the members directly.
+*/
+struct fz_sha512_s
+{
+	uint64_t state[8];
+	unsigned int count[2];
+	union {
+		unsigned char u8[128];
+		uint64_t u64[16];
+	} buffer;
+};
+
+void fz_sha512_init(fz_sha512 *state);
+void fz_sha512_update(fz_sha512 *state, const unsigned char *input, size_t inlen);
+void fz_sha512_final(fz_sha512 *state, unsigned char digest[64]);
+
+/* sha-384 digests */
+
+typedef struct fz_sha512_s fz_sha384;
+
+void fz_sha384_init(fz_sha384 *state);
+void fz_sha384_update(fz_sha384 *state, const unsigned char *input, size_t inlen);
+void fz_sha384_final(fz_sha384 *state, unsigned char digest[64]);
+
+/* arc4 crypto */
+
+typedef struct fz_arc4_s fz_arc4;
+
+/*
+	Structure definition is public to enable stack
+	based allocation. Do not access the members directly.
+*/
+struct fz_arc4_s
+{
+	unsigned x;
+	unsigned y;
+	unsigned char state[256];
+};
+
+void fz_arc4_init(fz_arc4 *state, const unsigned char *key, size_t len);
+void fz_arc4_encrypt(fz_arc4 *state, unsigned char *dest, const unsigned char *src, size_t len);
+
+/* AES block cipher implementation from XYSSL */
+
+typedef struct fz_aes_s fz_aes;
+
+#define FZ_AES_DECRYPT 0
+#define FZ_AES_ENCRYPT 1
+
+/*
+	Structure definition is public to enable stack
+	based allocation. Do not access the members directly.
+*/
+struct fz_aes_s
+{
+	int nr; /* number of rounds */
+	unsigned long *rk; /* AES round keys */
+	unsigned long buf[68]; /* unaligned data */
+};
+
+int fz_aes_setkey_enc( fz_aes *ctx, const unsigned char *key, int keysize );
+int fz_aes_setkey_dec( fz_aes *ctx, const unsigned char *key, int keysize );
+void fz_aes_crypt_cbc( fz_aes *ctx, int mode, size_t length,
+	unsigned char iv[16],
+	const unsigned char *input,
+	unsigned char *output );
+
+#endif