crypto_gnutls.c

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#include <stdio.h>
#include <sys/types.h>
#include <gcrypt.h>

#include "common.h"
#include "crypto.h"

void md4_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
{
        gcry_md_hd_t hd;
        unsigned char *p;
        int i;

        if (gcry_md_open(&hd, GCRY_MD_MD4, 0) != GPG_ERR_NO_ERROR)
                return;
        for (i = 0; i < num_elem; i++)
                gcry_md_write(hd, addr[i], len[i]);
        p = gcry_md_read(hd, GCRY_MD_MD4);
        if (p)
                memcpy(mac, p, gcry_md_get_algo_dlen(GCRY_MD_MD4));
        gcry_md_close(hd);
}


void des_encrypt(const u8 *clear, const u8 *key, u8 *cypher)
{
        gcry_cipher_hd_t hd;
        u8 pkey[8], next, tmp;
        int i;

        /* Add parity bits to the key */
        next = 0;
        for (i = 0; i < 7; i++) {
                tmp = key[i];
                pkey[i] = (tmp >> i) | next | 1;
                next = tmp << (7 - i);
        }
        pkey[i] = next | 1;

        gcry_cipher_open(&hd, GCRY_CIPHER_DES, GCRY_CIPHER_MODE_ECB, 0);
        gcry_err_code(gcry_cipher_setkey(hd, pkey, 8));
        gcry_cipher_encrypt(hd, cypher, 8, clear, 8);
        gcry_cipher_close(hd);
}


#ifdef EAP_TLS_FUNCS
void md5_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
{
        gcry_md_hd_t hd;
        unsigned char *p;
        int i;

        if (gcry_md_open(&hd, GCRY_MD_MD5, 0) != GPG_ERR_NO_ERROR)
                return;
        for (i = 0; i < num_elem; i++)
                gcry_md_write(hd, addr[i], len[i]);
        p = gcry_md_read(hd, GCRY_MD_MD5);
        if (p)
                memcpy(mac, p, gcry_md_get_algo_dlen(GCRY_MD_MD5));
        gcry_md_close(hd);
}


void sha1_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
{
        gcry_md_hd_t hd;
        unsigned char *p;
        int i;

        if (gcry_md_open(&hd, GCRY_MD_SHA1, 0) != GPG_ERR_NO_ERROR)
                return;
        for (i = 0; i < num_elem; i++)
                gcry_md_write(hd, addr[i], len[i]);
        p = gcry_md_read(hd, GCRY_MD_SHA1);
        if (p)
                memcpy(mac, p, gcry_md_get_algo_dlen(GCRY_MD_SHA1));
        gcry_md_close(hd);
}


void sha1_transform(u8 *state, const u8 data[64])
{
        /* FIX: how to do this with libgcrypt? */
}


void * aes_encrypt_init(const u8 *key, size_t len)
{
        gcry_cipher_hd_t hd;

        if (gcry_cipher_open(&hd, GCRY_CIPHER_AES, GCRY_CIPHER_MODE_ECB, 0) !=
            GPG_ERR_NO_ERROR) {
                printf("cipher open failed\n");
                return NULL;
        }
        if (gcry_cipher_setkey(hd, key, len) != GPG_ERR_NO_ERROR) {
                printf("setkey failed\n");
                gcry_cipher_close(hd);
                return NULL;
        }

        return hd;
}


void aes_encrypt(void *ctx, const u8 *plain, u8 *crypt)
{
        gcry_cipher_hd_t hd = ctx;
        gcry_cipher_encrypt(hd, crypt, 16, plain, 16);
}


void aes_encrypt_deinit(void *ctx)
{
        gcry_cipher_hd_t hd = ctx;
        gcry_cipher_close(hd);
}


void * aes_decrypt_init(const u8 *key, size_t len)
{
        gcry_cipher_hd_t hd;

        if (gcry_cipher_open(&hd, GCRY_CIPHER_AES, GCRY_CIPHER_MODE_ECB, 0) !=
            GPG_ERR_NO_ERROR)
                return NULL;
        if (gcry_cipher_setkey(hd, key, len) != GPG_ERR_NO_ERROR) {
                gcry_cipher_close(hd);
                return NULL;
        }

        return hd;
}


void aes_decrypt(void *ctx, const u8 *crypt, u8 *plain)
{
        gcry_cipher_hd_t hd = ctx;
        gcry_cipher_decrypt(hd, plain, 16, crypt, 16);
}


void aes_decrypt_deinit(void *ctx)
{
        gcry_cipher_hd_t hd = ctx;
        gcry_cipher_close(hd);
}
#endif /* EAP_TLS_FUNCS */

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