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// dependency: libsodium
#include <sodium.h>
#include <string.h>
//
#include "common.c"
#if crypto_box_PUBLICKEYBYTES != 32 || crypto_box_SECRETKEYBYTES != 32
#error currently, moonpaste requires 32 bytes length for public key and private key each.
#endif
#if crypto_sign_BYTES != 64
#error moonpaste needs 64 bytes length for signature.
#endif
#ifndef SIGN_PUBLICKEYBYTES
#define SIGN_PUBLICKEYBYTES crypto_sign_PUBLICKEYBYTES
#endif
#ifndef SIGN_SECRETKEYBYTES
#define SIGN_SECRETKEYBYTES crypto_sign_SECRETKEYBYTES
#endif
typedef unsigned char sign_public_key[ SIGN_PUBLICKEYBYTES ];
typedef unsigned char sign_secret_key[ SIGN_SECRETKEYBYTES ];
typedef struct {
public_key encryption_pub;
private_key encryption_priv;
sign_public_key signing_pub;
sign_secret_key signing_priv;
} keypair;
typedef struct {
bool is_valid;
byte data[ 65536 - crypto_box_MACBYTES - crypto_box_NONCEBYTES ];
} plain_payload;
typedef struct {
byte nonce[ crypto_box_NONCEBYTES ];
byte encrypted_data[ 65536 - crypto_box_NONCEBYTES ];
byte signature[ crypto_sign_BYTES ];
} secure_payload;
bool has_called_sodium_init = false;
void init_sec(void) {
if (unlikely(!has_called_sodium_init)) {
if (sodium_init() == -1) {
fprintf(stderr, "sodium init failed\n");
exit(1);
}
has_called_sodium_init = true;
}
}
keypair generate_keypair(void) {
init_sec();
keypair new;
crypto_box_keypair(new.encryption_pub, new.encryption_priv);
crypto_sign_keypair(new.signing_pub, new.signing_priv);
return new;
}
secure_payload
encrypt_and_sign(plain_payload input, keypair author_keys, public_key target_encryption_public) {
init_sec();
secure_payload output;
randombytes_buf(output.nonce, crypto_box_NONCEBYTES);
if (crypto_box_easy(
output.encrypted_data,
input.data,
sizeof(input.data),
output.nonce,
target_encryption_public,
author_keys.encryption_priv)
!= 0) {
fprintf(stderr, "sodium encryption failed\n");
exit(1);
}
byte message_to_sign[ crypto_box_NONCEBYTES + sizeof(output.encrypted_data) ];
memcpy(message_to_sign, output.nonce, crypto_box_NONCEBYTES);
memcpy(
message_to_sign + crypto_box_NONCEBYTES,
output.encrypted_data,
sizeof(output.encrypted_data));
if (crypto_sign_detached(
output.signature,
NULL,
message_to_sign,
sizeof(message_to_sign),
author_keys.signing_priv)
!= 0) {
fprintf(stderr, "sodium signing failed\n");
exit(1);
}
return output;
}
plain_payload decrypt(
secure_payload input,
keypair target_keys,
public_key author_public,
public_key author_signing_public) {
init_sec();
plain_payload output;
output.is_valid = true;
byte message_to_verify[ crypto_box_NONCEBYTES + sizeof(input.encrypted_data) ];
memcpy(message_to_verify, input.nonce, crypto_box_NONCEBYTES);
memcpy(
message_to_verify + crypto_box_NONCEBYTES,
input.encrypted_data,
sizeof(input.encrypted_data));
if (crypto_sign_verify_detached(
input.signature, message_to_verify, sizeof(message_to_verify), author_signing_public)
!= 0) {
output.is_valid = false;
return output;
}
if (crypto_box_open_easy(
output.data,
input.encrypted_data,
sizeof(input.encrypted_data),
input.nonce,
author_public,
target_keys.encryption_priv)
!= 0) {
fprintf(stderr, "sodium decryption failed\n");
exit(1);
}
return output;
}
bool verify_signature(secure_payload input, public_key author_signing_public) {
init_sec();
byte message_to_verify[ crypto_box_NONCEBYTES + sizeof(input.encrypted_data) ];
memcpy(message_to_verify, input.nonce, crypto_box_NONCEBYTES);
memcpy(
message_to_verify + crypto_box_NONCEBYTES,
input.encrypted_data,
sizeof(input.encrypted_data));
return crypto_sign_verify_detached(
input.signature, message_to_verify, sizeof(message_to_verify), author_signing_public)
== 0;
}
bool verify_raw_signature(
const byte* msg,
size_t msg_len,
const signature signature,
const sign_public_key author_signing_public) {
init_sec();
if (msg == NULL || signature == NULL || author_signing_public == NULL) return false;
return crypto_sign_verify_detached(signature, msg, msg_len, author_signing_public) == 0;
}
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