47 lines
2.0 KiB
C
47 lines
2.0 KiB
C
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#ifndef _RFB_CRYPTO_H
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#define _RFB_CRYPTO_H 1
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#include <stdint.h>
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#include "config.h"
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#define SHA1_HASH_SIZE 20
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#define MD5_HASH_SIZE 16
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/* Generates an MD5 hash of 'in' and writes it to 'out', which must be 16 bytes in size. */
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int hash_md5(void *out, const void *in, const size_t in_len);
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/* Generates an SHA1 hash of 'in' and writes it to 'out', which must be 20 bytes in size. */
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int hash_sha1(void *out, const void *in, const size_t in_len);
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/* Fill 'out' with 'len' random bytes. */
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void random_bytes(void *out, size_t len);
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/*
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Takes the 8-byte key in 'key', reverses the bits in each byte of key as required by the RFB protocol,
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encrypts 'in' with the resulting key using single-key 56-bit DES and writes the result to 'out'.
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*/
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int encrypt_rfbdes(void *out, int *out_len, const unsigned char key[8], const void *in, const size_t in_len);
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/*
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Takes the 8-byte key in 'key', reverses the bits in each byte of key as required by the RFB protocol,
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decrypts 'in' with the resulting key using single-key 56-bit DES and writes the result to 'out'.
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*/
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int decrypt_rfbdes(void *out, int *out_len, const unsigned char key[8], const void *in, const size_t in_len);
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/* Encrypts 'in' with the the 16-byte key in 'key' using AES-128-ECB and writes the result to 'out'. */
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int encrypt_aes128ecb(void *out, int *out_len, const unsigned char key[16], const void *in, const size_t in_len);
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/*
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Generates a Diffie-Hellman public-private keypair using the generator value 'gen' and prime modulo
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'prime', writing the result to 'pub_out' and 'priv_out', which must be 'keylen' in size.
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*/
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int dh_generate_keypair(uint8_t *priv_out, uint8_t *pub_out, const uint8_t *gen, const size_t gen_len, const uint8_t *prime, const size_t keylen);
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/*
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Computes the shared Diffie-Hellman secret using the private key 'priv', the other side's public
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key 'pub' and the modulo prime 'prime' and writes it to 'shared_out', which must be 'keylen' in size.
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*/
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int dh_compute_shared_key(uint8_t *shared_out, const uint8_t *priv, const uint8_t *pub, const uint8_t *prime, const size_t keylen);
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#endif
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