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wsgcrypt.h
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1 
15 #ifndef __WSGCRYPT_H__
16 #define __WSGCRYPT_H__
17 
18 #include <wireshark.h>
19 #include <gcrypt.h>
20 
21 #define HASH_MD5_LENGTH 16
22 #define HASH_SHA1_LENGTH 20
23 #define HASH_SHA2_224_LENGTH 28
24 #define HASH_SHA2_256_LENGTH 32
25 #define HASH_SHA2_384_LENGTH 48
26 #define HASH_SHA2_512_LENGTH 64
27 
28 /* Convenience function to calculate the HMAC from the data in BUFFER
29  of size LENGTH with key KEY of size KEYLEN using the algorithm ALGO avoiding the creating of a
30  hash object. The hash is returned in the caller provided buffer
31  DIGEST which must be large enough to hold the digest of the given
32  algorithm. */
33 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);
34 
35 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);
36 
37 /* Convenience function to encrypt 8 bytes in BUFFER with DES using the 56 bits KEY expanded to
38  64 bits as key, encrypted data is returned in OUTPUT which must be at least 8 bytes large */
39 WS_DLL_PUBLIC void crypt_des_ecb(uint8_t *output, const uint8_t *buffer, const uint8_t *key56);
40 
41 /* Convenience function for RSA decryption. Returns decrypted length on success, 0 on failure */
42 WS_DLL_PUBLIC size_t rsa_decrypt_inplace(const unsigned len, unsigned char* data, gcry_sexp_t pk, bool pkcs1_padding, char **err);
43 
57 WS_DLL_PUBLIC gcry_error_t
58 hkdf_expand(int hashalgo, const uint8_t *prk, unsigned prk_len, const uint8_t *info, unsigned info_len,
59  uint8_t *out, unsigned out_len);
60 
61 /*
62  * Calculate HKDF-Extract(salt, IKM) -> PRK according to RFC 5869.
63  * Caller MUST ensure that 'prk' is large enough to store the digest from hash
64  * algorithm 'hashalgo' (e.g. 32 bytes for SHA-256).
65  */
66 static inline gcry_error_t
67 hkdf_extract(int hashalgo, const uint8_t *salt, size_t salt_len, const uint8_t *ikm, size_t ikm_len, uint8_t *prk)
68 {
69  /* PRK = HMAC-Hash(salt, IKM) where salt is key, and IKM is input. */
70  return ws_hmac_buffer(hashalgo, prk, ikm, ikm_len, salt, salt_len);
71 }
72 
73 
74 #endif /* __WSGCRYPT_H__ */
Definition: mcast_stream.h:30
Definition: file-pcapng.h:57
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)
Definition: wsgcrypt.c:166