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- /* Copyright (c) 2012-2015, The Tor Project, Inc. */
- /* See LICENSE for licensing information */
- /* Formatting and parsing code for crypto-related data structures. */
- #include "orconfig.h"
- #ifdef HAVE_SYS_STAT_H
- #include <sys/stat.h>
- #endif
- #include "crypto.h"
- #include "crypto_curve25519.h"
- #include "crypto_ed25519.h"
- #include "util.h"
- #include "torlog.h"
- int
- curve25519_public_to_base64(char *output,
- const curve25519_public_key_t *pkey)
- {
- char buf[128];
- base64_encode(buf, sizeof(buf),
- (const char*)pkey->public_key, CURVE25519_PUBKEY_LEN, 0);
- buf[CURVE25519_BASE64_PADDED_LEN] = '\0';
- memcpy(output, buf, CURVE25519_BASE64_PADDED_LEN+1);
- return 0;
- }
- int
- curve25519_public_from_base64(curve25519_public_key_t *pkey,
- const char *input)
- {
- size_t len = strlen(input);
- if (len == CURVE25519_BASE64_PADDED_LEN - 1) {
- /* not padded */
- return digest256_from_base64((char*)pkey->public_key, input);
- } else if (len == CURVE25519_BASE64_PADDED_LEN) {
- char buf[128];
- if (base64_decode(buf, sizeof(buf), input, len) != CURVE25519_PUBKEY_LEN)
- return -1;
- memcpy(pkey->public_key, buf, CURVE25519_PUBKEY_LEN);
- return 0;
- } else {
- return -1;
- }
- }
- /** Try to decode the string <b>input</b> into an ed25519 public key. On
- * success, store the value in <b>pkey</b> and return 0. Otherwise return
- * -1. */
- int
- ed25519_public_from_base64(ed25519_public_key_t *pkey,
- const char *input)
- {
- return digest256_from_base64((char*)pkey->pubkey, input);
- }
- /** Encode the public key <b>pkey</b> into the buffer at <b>output</b>,
- * which must have space for ED25519_BASE64_LEN bytes of encoded key,
- * plus one byte for a terminating NUL. Return 0 on success, -1 on failure.
- */
- int
- ed25519_public_to_base64(char *output,
- const ed25519_public_key_t *pkey)
- {
- return digest256_to_base64(output, (const char *)pkey->pubkey);
- }
- /** Encode the signature <b>sig</b> into the buffer at <b>output</b>,
- * which must have space for ED25519_SIG_BASE64_LEN bytes of encoded signature,
- * plus one byte for a terminating NUL. Return 0 on success, -1 on failure.
- */
- int
- ed25519_signature_to_base64(char *output,
- const ed25519_signature_t *sig)
- {
- char buf[256];
- int n = base64_encode_nopad(buf, sizeof(buf), sig->sig, ED25519_SIG_LEN);
- tor_assert(n == ED25519_SIG_BASE64_LEN);
- memcpy(output, buf, ED25519_SIG_BASE64_LEN+1);
- return 0;
- }
- /** Try to decode the string <b>input</b> into an ed25519 signature. On
- * success, store the value in <b>sig</b> and return 0. Otherwise return
- * -1. */
- int
- ed25519_signature_from_base64(ed25519_signature_t *sig,
- const char *input)
- {
- if (strlen(input) != ED25519_SIG_BASE64_LEN)
- return -1;
- char buf[ED25519_SIG_BASE64_LEN+3];
- memcpy(buf, input, ED25519_SIG_BASE64_LEN);
- buf[ED25519_SIG_BASE64_LEN+0] = '=';
- buf[ED25519_SIG_BASE64_LEN+1] = '=';
- buf[ED25519_SIG_BASE64_LEN+2] = 0;
- char decoded[128];
- int n = base64_decode(decoded, sizeof(decoded), buf, strlen(buf));
- if (n < 0 || n != ED25519_SIG_LEN)
- return -1;
- memcpy(sig->sig, decoded, ED25519_SIG_LEN);
- return 0;
- }
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