1 files changed, 29 insertions, 0 deletions
diff --git a/crypto/pubkey-ppk.c b/crypto/pubkey-ppk.c
new file mode 100644
index 00000000..7ffb570a
--- /dev/null
+++ b/crypto/pubkey-ppk.c
@@ -0,0 +1,29 @@
+/*
+ * Convenience functions to encrypt and decrypt PuTTY's own .PPK
+ * format for SSH-2 private key files, which uses 256-bit AES in CBC
+ * mode.
+ */
+
+#include "ssh.h"
+
+static ssh_cipher *aes256_pubkey_cipher(const void *key, const void *iv)
+{
+    ssh_cipher *cipher = ssh_cipher_new(&ssh_aes256_cbc);
+    ssh_cipher_setkey(cipher, key);
+    ssh_cipher_setiv(cipher, iv);
+    return cipher;
+}
+
+void aes256_encrypt_pubkey(const void *key, const void *iv, void *blk, int len)
+{
+    ssh_cipher *c = aes256_pubkey_cipher(key, iv);
+    ssh_cipher_encrypt(c, blk, len);
+    ssh_cipher_free(c);
+}
+
+void aes256_decrypt_pubkey(const void *key, const void *iv, void *blk, int len)
+{
+    ssh_cipher *c = aes256_pubkey_cipher(key, iv);
+    ssh_cipher_decrypt(c, blk, len);
+    ssh_cipher_free(c);
+}