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Commit db0850c3 authored by Kenny Root's avatar Kenny Root
Browse files

Add support for ECDSA P-256 with SHA256 

This adds a small EC library that is capable of verifying a signature of
SHA256 with ECDSA on the NIST P-256 curve.

Change-Id: I2a16639c92a77e8e4783c47ffbc56676de56eb59
parent 7dbe9660

include/mincrypt/dsa_sig.h

0 → 100644
+43 −0
Original line number Diff line number Diff line 
/*

 * Copyright 2013 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,

 * 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 SYSTEM_CORE_INCLUDE_MINCRYPT_DSA_SIG_H_

#define SYSTEM_CORE_INCLUDE_MINCRYPT_DSA_SIG_H_



#include "mincrypt/p256.h"



#ifdef __cplusplus

extern "C" {

#endif



// Returns 0 if input sig is not a valid ASN.1 sequence

int dsa_sig_unpack(unsigned char* sig, int sig_len, p256_int* r_int, p256_int* s_int);



#ifdef __cplusplus

}

#endif



#endif /* SYSTEM_CORE_INCLUDE_MINCRYPT_DSA_SIG_H_ */

include/mincrypt/hash-internal.h

+29 −6
Original line number Diff line number Diff line 
// Copyright 2007 Google Inc. All Rights Reserved.

// Author: mschilder@google.com (Marius Schilder)



#ifndef SECURITY_UTIL_LITE_HASH_INTERNAL_H__

#define SECURITY_UTIL_LITE_HASH_INTERNAL_H__

/*

 * Copyright 2007 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,

 * 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 SYSTEM_CORE_INCLUDE_MINCRYPT_HASH_INTERNAL_H_

#define SYSTEM_CORE_INCLUDE_MINCRYPT_HASH_INTERNAL_H_



#include <stdint.h>
@@ -37,4 +60,4 @@ typedef struct HASH_CTX { 
}

#endif  // __cplusplus



#endif  // SECURITY_UTIL_LITE_HASH_INTERNAL_H__
 
#endif  // SYSTEM_CORE_INCLUDE_MINCRYPT_HASH_INTERNAL_H_

include/mincrypt/p256.h

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+162 −0
Original line number Diff line number Diff line 
/*

 * Copyright 2013 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,

 * 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 SYSTEM_CORE_INCLUDE_MINCRYPT_LITE_P256_H_

#define SYSTEM_CORE_INCLUDE_MINCRYPT_LITE_P256_H_



// Collection of routines manipulating 256 bit unsigned integers.

// Just enough to implement ecdsa-p256 and related algorithms.



#include <stdint.h>



#ifdef __cplusplus

extern "C" {

#endif



#define P256_BITSPERDIGIT 32

#define P256_NDIGITS 8

#define P256_NBYTES 32



typedef int p256_err;

typedef uint32_t p256_digit;

typedef int32_t p256_sdigit;

typedef uint64_t p256_ddigit;

typedef int64_t p256_sddigit;



// Defining p256_int as struct to leverage struct assigment.

typedef struct {

  p256_digit a[P256_NDIGITS];

} p256_int;



extern const p256_int SECP256r1_n;  // Curve order

extern const p256_int SECP256r1_p;  // Curve prime

extern const p256_int SECP256r1_b;  // Curve param



// Initialize a p256_int to zero.

void p256_init(p256_int* a);



// Clear a p256_int to zero.

void p256_clear(p256_int* a);



// Return bit. Index 0 is least significant.

int p256_get_bit(const p256_int* a, int index);



// b := a % MOD

void p256_mod(

    const p256_int* MOD,

    const p256_int* a,

    p256_int* b);



// c := a * (top_b | b) % MOD

void p256_modmul(

    const p256_int* MOD,

    const p256_int* a,

    const p256_digit top_b,

    const p256_int* b,

    p256_int* c);



// b := 1 / a % MOD

// MOD best be SECP256r1_n

void p256_modinv(

    const p256_int* MOD,

    const p256_int* a,

    p256_int* b);



// b := 1 / a % MOD

// MOD best be SECP256r1_n

// Faster than p256_modinv()

void p256_modinv_vartime(

    const p256_int* MOD,

    const p256_int* a,

    p256_int* b);



// b := a << (n % P256_BITSPERDIGIT)

// Returns the bits shifted out of most significant digit.

p256_digit p256_shl(const p256_int* a, int n, p256_int* b);



// b := a >> (n % P256_BITSPERDIGIT)

void p256_shr(const p256_int* a, int n, p256_int* b);



int p256_is_zero(const p256_int* a);

int p256_is_odd(const p256_int* a);

int p256_is_even(const p256_int* a);



// Returns -1, 0 or 1.

int p256_cmp(const p256_int* a, const p256_int *b);



// c: = a - b

// Returns -1 on borrow.

int p256_sub(const p256_int* a, const p256_int* b, p256_int* c);



// c := a + b

// Returns 1 on carry.

int p256_add(const p256_int* a, const p256_int* b, p256_int* c);



// c := a + (single digit)b

// Returns carry 1 on carry.

int p256_add_d(const p256_int* a, p256_digit b, p256_int* c);



// ec routines.



// {out_x,out_y} := nG

void p256_base_point_mul(const p256_int *n,

                         p256_int *out_x,

                         p256_int *out_y);



// {out_x,out_y} := n{in_x,in_y}

void p256_point_mul(const p256_int *n,

                    const p256_int *in_x,

                    const p256_int *in_y,

                    p256_int *out_x,

                    p256_int *out_y);



// {out_x,out_y} := n1G + n2{in_x,in_y}

void p256_points_mul_vartime(

    const p256_int *n1, const p256_int *n2,

    const p256_int *in_x, const p256_int *in_y,

    p256_int *out_x, p256_int *out_y);



// Return whether point {x,y} is on curve.

int p256_is_valid_point(const p256_int* x, const p256_int* y);



// Outputs big-endian binary form. No leading zero skips.

void p256_to_bin(const p256_int* src, uint8_t dst[P256_NBYTES]);



// Reads from big-endian binary form,

// thus pre-pad with leading zeros if short.

void p256_from_bin(const uint8_t src[P256_NBYTES], p256_int* dst);



#define P256_DIGITS(x) ((x)->a)

#define P256_DIGIT(x,y) ((x)->a[y])



#define P256_ZERO {{0}}

#define P256_ONE {{1}}



#ifdef __cplusplus

}

#endif



#endif  // SYSTEM_CORE_INCLUDE_MINCRYPT_LITE_P256_H_

include/mincrypt/p256_ecdsa.h

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+53 −0
Original line number Diff line number Diff line 
/*

 * Copyright 2013 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,

 * 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 SYSTEM_CORE_INCLUDE_MINCRYPT_P256_ECDSA_H_

#define SYSTEM_CORE_INCLUDE_MINCRYPT_P256_ECDSA_H_



// Using current directory as relative include path here since

// this code typically gets lifted into a variety of build systems

// and directory structures.

#include "p256.h"



#ifdef __cplusplus

extern "C" {

#endif



// Returns 0 if {r,s} is not a signature on message for

// public key {key_x,key_y}.

//

// Note: message is a p256_int.

// Convert from a binary string using p256_from_bin().

int p256_ecdsa_verify(const p256_int* key_x,

                      const p256_int* key_y,

                      const p256_int* message,

                      const p256_int* r, const p256_int* s);



#ifdef __cplusplus

}

#endif



#endif  // SYSTEM_CORE_INCLUDE_MINCRYPT_P256_ECDSA_H_

include/mincrypt/rsa.h

+3 −3
Original line number Diff line number Diff line
@@ -25,8 +25,8 @@ 
** ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/



#ifndef _EMBEDDED_RSA_H_

#define _EMBEDDED_RSA_H_

#ifndef SYSTEM_CORE_INCLUDE_MINCRYPT_RSA_H_

#define SYSTEM_CORE_INCLUDE_MINCRYPT_RSA_H_



#include <inttypes.h>
@@ -55,4 +55,4 @@ int RSA_verify(const RSAPublicKey *key, 
}

#endif



#endif
 
#endif // SYSTEM_CORE_INCLUDE_MINCRYPT_RSA_H_