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Add crypto_cipher_{init,encrypt,decrypt,deinit} for GnuTLS

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This commit is contained in:
Jouni Malinen 2009-02-07 12:04:45 +02:00
parent 96c7c3072d
commit 23a139246d
1 changed files with 114 additions and 1 deletions
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115
src/crypto/crypto_gnutls.c
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@ -1,6 +1,6 @@
/* /*
* WPA Supplicant / wrapper functions for libgcrypt * WPA Supplicant / wrapper functions for libgcrypt
* Copyright (c) 2004-2005, Jouni Malinen <j@w1.fi> * Copyright (c) 2004-2009, Jouni Malinen <j@w1.fi>
* *
* This program is free software; you can redistribute it and/or modify * This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as * it under the terms of the GNU General Public License version 2 as
@ -198,3 +198,116 @@ error:
gcry_mpi_release(bn_result); gcry_mpi_release(bn_result);
return ret; return ret;
} }
struct crypto_cipher {
gcry_cipher_hd_t enc;
gcry_cipher_hd_t dec;
};
struct crypto_cipher * crypto_cipher_init(enum crypto_cipher_alg alg,
const u8 *iv, const u8 *key,
size_t key_len)
{
struct crypto_cipher *ctx;
gcry_error_t res;
enum gcry_cipher_algos a;
int ivlen;
ctx = os_zalloc(sizeof(*ctx));
if (ctx == NULL)
return NULL;
switch (alg) {
case CRYPTO_CIPHER_ALG_RC4:
a = GCRY_CIPHER_ARCFOUR;
res = gcry_cipher_open(&ctx->enc, a, GCRY_CIPHER_MODE_STREAM,
0);
gcry_cipher_open(&ctx->dec, a, GCRY_CIPHER_MODE_STREAM, 0);
break;
case CRYPTO_CIPHER_ALG_AES:
if (key_len == 24)
a = GCRY_CIPHER_AES192;
else if (key_len == 32)
a = GCRY_CIPHER_AES256;
else
a = GCRY_CIPHER_AES;
res = gcry_cipher_open(&ctx->enc, a, GCRY_CIPHER_MODE_CBC, 0);
gcry_cipher_open(&ctx->dec, a, GCRY_CIPHER_MODE_CBC, 0);
break;
case CRYPTO_CIPHER_ALG_3DES:
a = GCRY_CIPHER_3DES;
res = gcry_cipher_open(&ctx->enc, a, GCRY_CIPHER_MODE_CBC, 0);
gcry_cipher_open(&ctx->dec, a, GCRY_CIPHER_MODE_CBC, 0);
break;
case CRYPTO_CIPHER_ALG_DES:
a = GCRY_CIPHER_DES;
res = gcry_cipher_open(&ctx->enc, a, GCRY_CIPHER_MODE_CBC, 0);
gcry_cipher_open(&ctx->dec, a, GCRY_CIPHER_MODE_CBC, 0);
break;
case CRYPTO_CIPHER_ALG_RC2:
if (key_len == 5)
a = GCRY_CIPHER_RFC2268_40;
else
a = GCRY_CIPHER_RFC2268_128;
res = gcry_cipher_open(&ctx->enc, a, GCRY_CIPHER_MODE_CBC, 0);
gcry_cipher_open(&ctx->dec, a, GCRY_CIPHER_MODE_CBC, 0);
break;
default:
os_free(ctx);
return NULL;
}
if (res != GPG_ERR_NO_ERROR) {
os_free(ctx);
return NULL;
}
if (gcry_cipher_setkey(ctx->enc, key, key_len) != GPG_ERR_NO_ERROR ||
gcry_cipher_setkey(ctx->dec, key, key_len) != GPG_ERR_NO_ERROR) {
gcry_cipher_close(ctx->enc);
gcry_cipher_close(ctx->dec);
os_free(ctx);
return NULL;
}
ivlen = gcry_cipher_get_algo_blklen(a);
if (gcry_cipher_setiv(ctx->enc, iv, ivlen) != GPG_ERR_NO_ERROR ||
gcry_cipher_setiv(ctx->dec, iv, ivlen) != GPG_ERR_NO_ERROR) {
gcry_cipher_close(ctx->enc);
gcry_cipher_close(ctx->dec);
os_free(ctx);
return NULL;
}
return ctx;
}
int crypto_cipher_encrypt(struct crypto_cipher *ctx, const u8 *plain,
u8 *crypt, size_t len)
{
if (gcry_cipher_encrypt(ctx->enc, crypt, len, plain, len) !=
GPG_ERR_NO_ERROR)
return -1;
return 0;
}
int crypto_cipher_decrypt(struct crypto_cipher *ctx, const u8 *crypt,
u8 *plain, size_t len)
{
if (gcry_cipher_decrypt(ctx->dec, plain, len, crypt, len) !=
GPG_ERR_NO_ERROR)
return -1;
return 0;
}
void crypto_cipher_deinit(struct crypto_cipher *ctx)
{
gcry_cipher_close(ctx->enc);
gcry_cipher_close(ctx->dec);
os_free(ctx);
}