include/mincrypt/rsa.h

/* rsa.h
**
** Copyright 2008, The Android Open Source Project
**
** 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.
**     * Neither the name of Google Inc. nor the names of its contributors may
**       be used to endorse or promote products derived from this software
**       without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY Google Inc. ``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 Google Inc. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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*/

#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 */
    int exponent;             /* 3 or 65537 */
} RSAPublicKey;

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

#ifdef __cplusplus
}
#endif

#endif