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cmdgen: add a --dump option.

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Also spelled '-O text', this takes a public or private key as input,
and produces on standard output a dump of all the actual numbers
involved in the key: the exponent and modulus for RSA, the p,q,g,y
parameters for DSA, the affine x and y coordinates of the public
elliptic curve point for ECC keys, and all the extra bits and pieces
in the private keys too.

Partly I expect this to be useful to me for debugging: I've had to
paste key files a few too many times through base64 decoders and hex
dump tools, then manually decode SSH marshalling and paste the result
into the Python REPL to get an integer object. Now I should be able to
get _straight_ to text I can paste into Python.

But also, it's a way that other applications can use the key
generator: if you need to generate, say, an RSA key in some format I
don't support (I've recently heard of an XML-based one, for example),
then you can run 'puttygen -t rsa --dump' and have it print the
elements of a freshly generated keypair on standard output, and then
all you have to do is understand the output format.
This commit is contained in:
Simon Tatham
2020-02-17 19:53:19 +00:00
parent 96f1fb9456
commit c18e5dc8fb
13 changed files with 317 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
testcrypt.c
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@ -87,6 +87,7 @@ uint64_t prng_reseed_time_ms(void)
X(rsakex, RSAKey *, ssh_rsakex_freekey(v)) \
X(rsa, RSAKey *, rsa_free(v)) \
X(prng, prng *, prng_free(v)) \
X(keycomponents, key_components *, key_components_free(v)) \
/* end of list */
typedef struct Value Value;
@ -576,6 +577,7 @@ static void return_val_string_asciz(strbuf *out, char *s)
NULLABLE_RETURN_WRAPPER(val_string, strbuf *)
NULLABLE_RETURN_WRAPPER(val_string_asciz, char *)
NULLABLE_RETURN_WRAPPER(val_string_asciz_const, const char *)
NULLABLE_RETURN_WRAPPER(val_cipher, ssh_cipher *)
NULLABLE_RETURN_WRAPPER(val_hash, ssh_hash *)
NULLABLE_RETURN_WRAPPER(val_key, ssh_key *)
@ -1077,6 +1079,25 @@ ssh_key *eddsa_generate_wrapper(int bits)
}
#define eddsa_generate eddsa_generate_wrapper
size_t key_components_count(key_components *kc) { return kc->ncomponents; }
const char *key_components_nth_name(key_components *kc, size_t n)
{
return (n >= kc->ncomponents ? NULL :
kc->components[n].name);
}
const char *key_components_nth_str(key_components *kc, size_t n)
{
return (n >= kc->ncomponents ? NULL :
kc->components[n].is_mp_int ? NULL :
kc->components[n].text);
}
mp_int *key_components_nth_mp(key_components *kc, size_t n)
{
return (n >= kc->ncomponents ? NULL :
!kc->components[n].is_mp_int ? NULL :
mp_copy(kc->components[n].mp));
}
#define VALTYPE_TYPEDEF(n,t,f) \
typedef t TD_val_##n; \
typedef t *TD_out_val_##n;
@ -1113,6 +1134,7 @@ typedef const ssh_cipheralg *TD_cipheralg;
typedef const ssh_kex *TD_dh_group;
typedef const ssh_kex *TD_ecdh_alg;
typedef RsaSsh1Order TD_rsaorder;
typedef key_components *TD_keycomponents;
#define FUNC0(rettype, function) \
static void handle_##function(BinarySource *in, strbuf *out) { \