libc/rsa.h

/*
 * Copyright (C) 2008 The Android Open Source Project
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the 
 *    distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef _EMBEDDED_RSA_H_
#define _EMBEDDED_RSA_H_

#include <inttypes.h>

#ifdef __cplusplus
extern "C" {
#endif

#define RSANUMBYTES 256           /* 2048 bit key length */
#define RSANUMWORDS (RSANUMBYTES / sizeof(uint32_t))

typedef struct RSAPublicKey {
    int len;                  /* Length of n[] in number of uint32_t */
    uint32_t n0inv;           /* -1 / n[0] mod 2^32 */
    uint32_t n[RSANUMWORDS];  /* modulus as little endian array */
    uint32_t rr[RSANUMWORDS]; /* R^2 as little endian array */
} RSAPublicKey;

int RSA_verify(RSAPublicKey *key,
               const uint8_t* signature,
               const int len,
               const uint8_t* sha);

#ifdef __cplusplus
}
#endif

#endif