pki: Add ssh_pki_export_pubkey_rsa1().

1 files changed, 29 insertions, 0 deletions

diff --git a/src/pki_crypto.c b/src/pki_crypto.c
index 29e589f1..32ee13d1 100644
--- a/src/pki_crypto.c
+++ b/src/pki_crypto.c
@@ -519,6 +519,35 @@ fail:
     return NULL;
 }
 
+int pki_export_pubkey_rsa1(const ssh_key key,
+                           const char *host,
+                           char *rsa1,
+                           size_t rsa1_len)
+{
+    char *e;
+    char *n;
+    int rsa_size = RSA_size(key->rsa);
+
+    e = bignum_bn2dec(key->rsa->e);
+    if (e == NULL) {
+        return SSH_ERROR;
+    }
+
+    n = bignum_bn2dec(key->rsa->n);
+    if (n == NULL) {
+        OPENSSL_free(e);
+        return SSH_ERROR;
+    }
+
+    snprintf(rsa1, rsa1_len,
+             "%s %d %s %s\n",
+             host, rsa_size << 3, e, n);
+    OPENSSL_free(e);
+    OPENSSL_free(n);
+
+    return SSH_OK;
+}
+
 /**
  * @internal
  *