wsgcrypt.h

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#ifndef __WSGCRYPT_H__
#define __WSGCRYPT_H__
 
#include <wireshark.h>
#include <gcrypt.h>
 
#define HASH_MD5_LENGTH                    16
#define HASH_SHA1_LENGTH                   20
#define HASH_SHA2_224_LENGTH               28
#define HASH_SHA2_256_LENGTH               32
#define HASH_SHA2_384_LENGTH               48
#define HASH_SHA2_512_LENGTH               64
#define AEAD_AES_128_GCM_KEY_LENGTH        16
#define AEAD_AES_256_GCM_KEY_LENGTH        32
#define AEAD_CHACHA20POLY1305_KEY_LENGTH   32
#define AEAD_MAX_KEY_LENGTH                32
#define HPKE_AEAD_NONCE_LENGTH             12
#define HPKE_AEAD_AUTH_TAG_LENGTH          16
#define HPKE_HKDF_SHA256                    1
#define HPKE_HKDF_SHA384                    2
#define HPKE_HKDF_SHA512                    3
#define HPKE_AEAD_AES_128_GCM               1
#define HPKE_AEAD_AES_256_GCM               2
#define HPKE_AEAD_CHACHA20POLY1305          3
#define HPKE_SUIT_ID_LEN                   10
#define HPKE_SUIT_PREFIX               "HPKE"
#define HPKE_VERSION_ID             "HPKE-v1"
#define HPKE_MAX_KDF_LEN HASH_SHA2_512_LENGTH
#define HPKE_MODE_BASE                      0
#define HPKE_MODE_PSK                       1
#define HPKE_MODE_AUTH                      2
#define HPKE_MODE_AUTH_PSK                  3
 
WS_DLL_PUBLIC gcry_error_t ws_hmac_buffer(int algo, void *digest,
                    const void *buffer, size_t length,
                    const void *key, size_t keylen);
 
 
WS_DLL_PUBLIC gcry_error_t ws_cmac_buffer(int algo, void *digest,
                    const void *buffer, size_t length,
                    const void *key, size_t keylen);
 
 
WS_DLL_PUBLIC gcry_error_t crypt_des_ecb(uint8_t *output, const uint8_t *buffer, const uint8_t *key56);
 
 
WS_DLL_PUBLIC size_t rsa_decrypt_inplace(const unsigned len, unsigned char* data,
                                         gcry_sexp_t pk, bool pkcs1_padding, char **err);
 
WS_DLL_PUBLIC size_t rsa_decrypt(const unsigned len, const unsigned char* data,
                                 uint8_t** plain,
                                         gcry_sexp_t pk, const char* flags, char **err);
 
WS_DLL_PUBLIC gcry_error_t
hkdf_expand(int hashalgo, const uint8_t *prk, unsigned prk_len, const uint8_t *info, unsigned info_len,
            uint8_t *out, unsigned out_len);
 
static inline gcry_error_t
hkdf_extract(int hashalgo, const uint8_t *salt, size_t salt_len, const uint8_t *ikm, size_t ikm_len, uint8_t *prk)
{
    /* PRK = HMAC-Hash(salt, IKM) where salt is key, and IKM is input. */
    return ws_hmac_buffer(hashalgo, prk, ikm, ikm_len, salt, salt_len);
}
 
WS_DLL_PUBLIC uint16_t
hpke_hkdf_len(uint16_t kdf_id);
 
 
WS_DLL_PUBLIC uint16_t
hpke_aead_key_len(uint16_t aead_id);
 
 
WS_DLL_PUBLIC uint16_t
hpke_aead_nonce_len(uint16_t aead_id);
 
 
WS_DLL_PUBLIC uint16_t
hpke_aead_auth_tag_len(uint16_t aead_id);
 
 
WS_DLL_PUBLIC void
hpke_suite_id(uint16_t kem_id, uint16_t kdf_id, uint16_t aead_id, uint8_t *suite_id);
 
 
WS_DLL_PUBLIC gcry_error_t
hpke_key_schedule(uint16_t kdf_id, uint16_t aead_id,
                  const uint8_t *salt, unsigned salt_len,
                  const uint8_t *suite_id,
                  const uint8_t *ikm, unsigned ikm_len,
                  uint8_t mode, uint8_t *key, uint8_t *base_nonce);
 
 
WS_DLL_PUBLIC gcry_error_t
hpke_setup_aead(gcry_cipher_hd_t* cipher, uint16_t aead_id, uint8_t *key);
 
 
WS_DLL_PUBLIC gcry_error_t
hpke_set_nonce(gcry_cipher_hd_t cipher, uint64_t seq,
               uint8_t *base_nonce, size_t nonce_len);
 
 
#endif /* __WSGCRYPT_H__ */