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pki: Add ssh_pki_export_signature_blob().

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This commit is contained in:
Andreas Schneider
2011-08-21 10:11:05 +02:00
parent ab0354dbb6
commit 4f19a304d1
4 changed files with 170 additions and 0 deletions
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64
src/pki_gcrypt.c
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@@ -1160,6 +1160,70 @@ fail:
return NULL;
}
ssh_string pki_signature_to_blob(const ssh_signature sig)
{
char buffer[40] = {0};
const char *r = NULL;
const char *s = NULL;
gcry_sexp_t sexp;
size_t size = 0;
ssh_string sig_blob;
switch(sig->type) {
case SSH_KEYTYPE_DSS:
sexp = gcry_sexp_find_token(sig->dsa_sig, "r", 0);
if (sexp == NULL) {
return NULL;
}
r = gcry_sexp_nth_data(sexp, 1, &size);
/* libgcrypt put 0 when first bit is set */
if (*r == 0) {
size--;
r++;
}
memcpy(buffer, r + size - 20, 20);
gcry_sexp_release(sexp);
sexp = gcry_sexp_find_token(sig->dsa_sig, "s", 0);
if (sexp == NULL) {
return NULL;
}
s = gcry_sexp_nth_data(sexp,1,&size);
if (*s == 0) {
size--;
s++;
}
memcpy(buffer+ 20, s + size - 20, 20);
gcry_sexp_release(sexp);
break;
case SSH_KEYTYPE_RSA:
case SSH_KEYTYPE_RSA1:
sexp = gcry_sexp_find_token(sig->rsa_sig, "s", 0);
if (sexp == NULL) {
return NULL;
}
s = gcry_sexp_nth_data(sexp, 1, &size);
if (*s == 0) {
size--;
s++;
}
sig_blob = ssh_string_new(size);
if (sig_blob == NULL) {
return NULL;
}
ssh_string_fill(sig_blob, discard_const_p(char, s), size);
gcry_sexp_release(sexp);
break;
case SSH_KEYTYPE_ECDSA:
case SSH_KEYTYPE_UNKNOWN:
break;
}
return sig_blob;
}
struct signature_struct *pki_do_sign(ssh_key privatekey,
const unsigned char *hash) {
struct signature_struct *sign;