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RSA SHA2 256/512 key upgrade support RFC 8332 #536 (#626)

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Notes:
* Host Key RSA 256/512 support #536
* Client side key hash upgrading for RFC 8332
* Support for server-sig-algs, ext-info-c server messages
* Customizing preferred server-sig-algs via the preference LIBSSH2_METHOD_SIGN_ALGO

Credit: Anders Borum, Will Cosgrove
This commit is contained in:
Will Cosgrove
2022-01-06 09:50:58 -08:00
committed by GitHub
parent 967792c896
commit 64a555d6f5
19 changed files with 689 additions and 25 deletions
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32
src/crypto.h
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@@ -93,6 +93,19 @@ int _libssh2_rsa_sha1_sign(LIBSSH2_SESSION * session,
size_t hash_len,
unsigned char **signature,
size_t *signature_len);
#if LIBSSH2_RSA_SHA2
int _libssh2_rsa_sha2_sign(LIBSSH2_SESSION * session,
libssh2_rsa_ctx * rsactx,
const unsigned char *hash,
size_t hash_len,
unsigned char **signature,
size_t *signature_len);
int _libssh2_rsa_sha2_verify(libssh2_rsa_ctx * rsa,
size_t hash_len,
const unsigned char *sig,
unsigned long sig_len,
const unsigned char *m, unsigned long m_len);
#endif
int _libssh2_rsa_new_private_frommemory(libssh2_rsa_ctx ** rsa,
LIBSSH2_SESSION * session,
const char *filedata,
@@ -245,4 +258,23 @@ int _libssh2_pub_priv_keyfilememory(LIBSSH2_SESSION *session,
size_t privatekeydata_len,
const char *passphrase);
/**
* @function _libssh2_supported_key_sign_algorithms
* @abstract Returns supported algorithms used for upgrading public
* key signing RFC 8332
* @discussion Based on the incoming key_method value, this function
* will return supported algorithms that can upgrade the key method
* @related _libssh2_key_sign_algorithm()
* @param key_method current key method, usually the default key sig method
* @param key_method_len length of the key method buffer
* @result comma seperated list of supported upgrade options per RFC 8332, if
* there is no upgrade option return NULL
*/
const char *
_libssh2_supported_key_sign_algorithms(LIBSSH2_SESSION *session,
unsigned char *key_method,
size_t key_method_len);
#endif /* __LIBSSH2_CRYPTO_H */