crypto_format.c File Reference

Formatting and parsing code for crypto-related data structures. More...

#include "orconfig.h"
#include "lib/container/smartlist.h"
#include "lib/crypt_ops/crypto_curve25519.h"
#include "lib/crypt_ops/crypto_digest.h"
#include "lib/crypt_ops/crypto_ed25519.h"
#include "lib/crypt_ops/crypto_format.h"
#include "lib/crypt_ops/crypto_util.h"
#include "lib/string/compat_string.h"
#include "lib/string/util_string.h"
#include "lib/string/printf.h"
#include "lib/encoding/binascii.h"
#include "lib/log/log.h"
#include "lib/log/util_bug.h"
#include "lib/fs/files.h"
#include <string.h>
#include <errno.h>

Go to the source code of this file.

Functions
int	crypto_write_tagged_contents_to_file (const char *fname, const char *typestring, const char *tag, const uint8_t *data, size_t datalen)
ssize_t	crypto_read_tagged_contents_from_file (const char *fname, const char *typestring, char **tag_out, uint8_t *data_out, ssize_t data_out_len)
void	curve25519_public_to_base64 (char *output, const curve25519_public_key_t *pkey, bool pad)
int	curve25519_public_from_base64 (curve25519_public_key_t *pkey, const char *input)
const char *	ed25519_fmt (const ed25519_public_key_t *pkey)
int	ed25519_public_from_base64 (ed25519_public_key_t *pkey, const char *input)
void	ed25519_public_to_base64 (char *output, const ed25519_public_key_t *pkey)
void	ed25519_signature_to_base64 (char *output, const ed25519_signature_t *sig)
int	ed25519_signature_from_base64 (ed25519_signature_t *sig, const char *input)
void	digest_to_base64 (char *d64, const char *digest)
int	digest_from_base64 (char *digest, const char *d64)
void	digest256_to_base64 (char *d64, const char *digest)
int	digest256_from_base64 (char *digest, const char *d64)

Detailed Description

Formatting and parsing code for crypto-related data structures.

Definition in file crypto_format.c.

Function Documentation

crypto_read_tagged_contents_from_file()

ssize_t crypto_read_tagged_contents_from_file	(	const char *	fname,
		const char *	typestring,
		char **	tag_out,
		uint8_t *	data_out,
		ssize_t	data_out_len
	)

Read a tagged-data file from fname into the data_out_len-byte buffer in data_out. Check that the typestring matches typestring; store the tag into a newly allocated string in tag_out. Return -1 on failure, and the number of bytes of data on success. Preserves the errno from reading the file.

Definition at line 77 of file crypto_format.c.

Referenced by curve25519_keypair_read_from_file(), ed25519_pubkey_read_from_file(), and ed25519_seckey_read_from_file().

crypto_write_tagged_contents_to_file()

int crypto_write_tagged_contents_to_file	(	const char *	fname,
		const char *	typestring,
		const char *	tag,
		const uint8_t *	data,
		size_t	datalen
	)

Write the datalen bytes from data to the file named fname in the tagged-data format. This format contains a 32-byte header, followed by the data itself. The header is the NUL-padded string "== <b>typestring</b>: <b>tag</b> ==". The length of typestring and tag must therefore be no more than 24.

Definition at line 42 of file crypto_format.c.

curve25519_public_from_base64()

int curve25519_public_from_base64	(	curve25519_public_key_t *	pkey,
		const char *	input
	)

Try to decode a base64-encoded curve25519 public key from input into the object at pkey. Return 0 on success, -1 on failure. Accepts keys with or without a trailing "=".

Definition at line 170 of file crypto_format.c.

curve25519_public_to_base64()

void curve25519_public_to_base64	(	char *	output,
		const curve25519_public_key_t *	pkey,
		bool	pad
	)

Encode pkey as a base64-encoded string in the buffer output. If pad is false do not include trailing "=" characters, otherwise include them. output must have at least CURVE25519_BASE64_PADDED_LEN+1 bytes available, even if pad is false. Can not fail.

Careful! CURVE25519_BASE64_PADDED_LEN is one byte longer than ED25519_BASE64_LEN.

Definition at line 144 of file crypto_format.c.

Referenced by encode_enc_key(), and encode_onion_key().

digest256_from_base64()

int digest256_from_base64	(	char *	digest,
		const char *	d64
	)

Given a base64 encoded, nul-terminated digest in d64 (without trailing newline or = characters), decode it and store the result in the first DIGEST256_LEN bytes at digest.

Definition at line 320 of file crypto_format.c.

Referenced by curve25519_public_from_base64(), and ed25519_public_from_base64().

digest256_to_base64()

void digest256_to_base64	(	char *	d64,
		const char *	digest
	)

Base64 encode DIGEST256_LINE bytes from digest, remove the trailing = characters, and store the nul-terminated result in the first BASE64_DIGEST256_LEN+1 bytes of d64. Can not fail.

Definition at line 304 of file crypto_format.c.

Referenced by ed25519_public_to_base64(), and keypin_journal_append_entry().

digest_from_base64()

int digest_from_base64	(	char *	digest,
		const char *	d64
	)

Given a base64 encoded, nul-terminated digest in d64 (without trailing newline or = characters), decode it and store the result in the first DIGEST_LEN bytes at digest.

Definition at line 291 of file crypto_format.c.

digest_to_base64()

void digest_to_base64	(	char *	d64,
		const char *	digest
	)

Base64 encode DIGEST_LEN bytes from digest, remove the trailing = characters, and store the nul-terminated result in the first BASE64_DIGEST_LEN+1 bytes of d64. Can not fail.

Definition at line 275 of file crypto_format.c.

Referenced by keypin_journal_append_entry(), and service_desc_note_upload().

ed25519_fmt()

const char* ed25519_fmt

(

const ed25519_public_key_t *

pkey

)

For logging convenience: Convert pkey to a statically allocated base64 string and return it. Not threadsafe. Format not meant to be computer-readable; it may change in the future. Subsequent calls invalidate previous returns.

Definition at line 193 of file crypto_format.c.

ed25519_public_from_base64()

int ed25519_public_from_base64	(	ed25519_public_key_t *	pkey,
		const char *	input
	)

Try to decode the string input into an ed25519 public key. On success, store the value in pkey and return 0. Otherwise return -1.

Definition at line 212 of file crypto_format.c.

Referenced by cache_lookup_v3_as_dir().

ed25519_public_to_base64()

void ed25519_public_to_base64	(	char *	output,
		const ed25519_public_key_t *	pkey
	)

Encode the public key pkey into the buffer at output, which must have space for ED25519_BASE64_LEN bytes of encoded key, plus one byte for a terminating NUL. Can not fail.

Careful! ED25519_BASE64_LEN is one byte shorter than CURVE25519_BASE64_PADDED_LEN.

Definition at line 227 of file crypto_format.c.

Referenced by directory_launch_v3_desc_fetch(), hs_control_desc_event_content(), hs_control_desc_event_created(), hs_control_desc_event_failed(), hs_control_desc_event_received(), hs_control_desc_event_upload(), pick_hsdir_v3(), and purge_hid_serv_request().

ed25519_signature_from_base64()

int ed25519_signature_from_base64	(	ed25519_signature_t *	sig,
		const char *	input
	)

Try to decode the string input into an ed25519 signature. On success, store the value in sig and return 0. Otherwise return -1.

Definition at line 255 of file crypto_format.c.

ed25519_signature_to_base64()

void ed25519_signature_to_base64	(	char *	output,
		const ed25519_signature_t *	sig
	)

Encode the signature sig into the buffer at output, which must have space for ED25519_SIG_BASE64_LEN bytes of encoded signature, plus one byte for a terminating NUL. Can not fail.

Definition at line 239 of file crypto_format.c.