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implemented gcrypt RSA encrypt/decrypt operations

This commit is contained in:
Martin Willi 2009-06-15 18:07:57 +02:00
parent 810ce1f336
commit d32b14db5e
2 changed files with 65 additions and 8 deletions
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43
src/libstrongswan/plugins/gcrypt/gcrypt_rsa_private_key.c
View File

@ -214,10 +214,47 @@ static bool sign(private_gcrypt_rsa_private_key_t *this, signature_scheme_t sche
* Implementation of gcrypt_rsa_private_key.destroy.
*/
static bool decrypt(private_gcrypt_rsa_private_key_t *this,
chunk_t crypto, chunk_t *plain)
chunk_t encrypted, chunk_t *plain)
{
DBG1("RSA private key decryption not implemented");
return FALSE;
gcry_error_t err;
gcry_sexp_t in, out;
chunk_t padded;
u_char *pos = NULL;;
err = gcry_sexp_build(&in, NULL, "(enc-val(flags)(rsa(a %b)))",
encrypted.len, encrypted.ptr);
if (err)
{
DBG1("building decryption S-expression failed: %s", gpg_strerror(err));
return FALSE;
}
err = gcry_pk_decrypt(&out, in, this->key);
gcry_sexp_release(in);
if (err)
{
DBG1("decrypting pkcs1 data failed: %s", gpg_strerror(err));
return FALSE;
}
padded.ptr = (u_char*)gcry_sexp_nth_data(out, 1, &padded.len);
/* result is padded, but gcrypt strips leading zero:
* 00 | 02 | RANDOM | 00 | DATA */
if (padded.ptr && padded.len > 2 && padded.ptr[0] == 0x02)
{
pos = memchr(padded.ptr, 0x00, padded.len - 1);
if (pos)
{
pos++;
*plain = chunk_clone(chunk_create(
pos, padded.len - (pos - padded.ptr)));
}
}
gcry_sexp_release(out);
if (!pos)
{
DBG1("decrypted data has invalid pkcs1 padding");
return FALSE;
}
return TRUE;
}
/**

30
src/libstrongswan/plugins/gcrypt/gcrypt_rsa_public_key.c
View File

@ -202,13 +202,33 @@ static bool verify(private_gcrypt_rsa_public_key_t *this,
}
/**
* Implementation of public_key_t.get_keysize.
* Implementation of public_key_t.encrypt.
*/
static bool encrypt_(private_gcrypt_rsa_public_key_t *this, chunk_t crypto,
chunk_t *plain)
static bool encrypt_(private_gcrypt_rsa_public_key_t *this, chunk_t plain,
chunk_t *encrypted)
{
DBG1("RSA public key encryption not implemented");
return FALSE;
gcry_sexp_t in, out;
gcry_error_t err;
/* "pkcs1" uses PKCS 1.5 (section 8.1) block type 2 encryption:
* 00 | 02 | RANDOM | 00 | DATA */
err = gcry_sexp_build(&in, NULL, "(data(flags pkcs1)(value %b))",
plain.len, plain.ptr);
if (err)
{
DBG1("building encryption S-expression failed: %s", gpg_strerror(err));
return FALSE;
}
err = gcry_pk_encrypt(&out, in, this->key);
gcry_sexp_release(in);
if (err)
{
DBG1("encrypting data using pkcs1 failed: %s", gpg_strerror(err));
return FALSE;
}
*encrypted = gcrypt_rsa_find_token(out, "a");
gcry_sexp_release(out);
return !!encrypted->len;
}
/**