-/*
- * Copyright (c) 2009 Chris K Cockrum <ckc@cockrum.net>
- *
- * Copyright (c) 2013 Jens Trillmann <jtrillma@tzi.de>
- * Copyright (c) 2013 Marc Müller-Weinhardt <muewei@tzi.de>
- * Copyright (c) 2013 Lars Schmertmann <lars@tzi.de>
- * Copyright (c) 2013 Hauke Mehrtens <hauke@hauke-m.de>
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- *
- * This implementation is based in part on the paper Implementation of an
- * Elliptic Curve Cryptosystem on an 8-bit Microcontroller [0] by
- * Chris K Cockrum <ckc@cockrum.net>.
- *
- * [0]: http://cockrum.net/Implementation_of_ECC_on_an_8-bit_microcontroller.pdf
- *
- * This is a efficient ECC implementation on the secp256r1 curve for 32 Bit CPU
- * architectures. It provides basic operations on the secp256r1 curve and support
- * for ECDH and ECDSA.
- */
-#include <inttypes.h>
-
-#define keyLengthInBytes 32
-#define arrayLength 8
-
-extern const uint32_t ecc_g_point_x[8];
-extern const uint32_t ecc_g_point_y[8];
-
-//ec Functions
-void ecc_ec_mult(const uint32_t *px, const uint32_t *py, const uint32_t *secret, uint32_t *resultx, uint32_t *resulty);
-
-static inline void ecc_ecdh(const uint32_t *px, const uint32_t *py, const uint32_t *secret, uint32_t *resultx, uint32_t *resulty) {
- ecc_ec_mult(px, py, secret, resultx, resulty);
-}
-int ecc_ecdsa_validate(const uint32_t *x, const uint32_t *y, const uint32_t *e, const uint32_t *r, const uint32_t *s);
-int ecc_ecdsa_sign(const uint32_t *d, const uint32_t *e, const uint32_t *k, uint32_t *r, uint32_t *s);
-
-int ecc_is_valid_key(const uint32_t * priv_key);
-static inline void ecc_gen_pub_key(const uint32_t *priv_key, uint32_t *pub_x, uint32_t *pub_y)
+/* Copyright 2014, Kenneth MacKay. Licensed under the BSD 2-clause license. */
+
+#ifndef _MICRO_ECC_H_
+#define _MICRO_ECC_H_
+
+#include <stdint.h>
+
+/* Platform selection options.
+If uECC_PLATFORM is not defined, the code will try to guess it based on compiler macros.
+Possible values for uECC_PLATFORM are defined below: */
+#define uECC_arch_other 0
+#define uECC_x86 1
+#define uECC_x86_64 2
+#define uECC_arm 3
+#define uECC_arm_thumb 4
+#define uECC_avr 5
+
+/* If desired, you can define uECC_WORD_SIZE as appropriate for your platform (1, 4, or 8 bytes).
+If uECC_WORD_SIZE is not explicitly defined then it will be automatically set based on your platform. */
+
+/* Inline assembly options.
+uECC_asm_none - Use standard C99 only.
+uECC_asm_small - Use GCC inline assembly for the target platform (if available), optimized for minimum size.
+uECC_asm_fast - Use GCC inline assembly optimized for maximum speed. */
+#define uECC_asm_none 0
+#define uECC_asm_small 1
+#define uECC_asm_fast 2
+#ifndef uECC_ASM
+ #define uECC_ASM uECC_asm_none//uECC_asm_fast
+#endif
+
+/* Curve selection options. */
+#define uECC_secp160r1 1
+#define uECC_secp192r1 2
+#define uECC_secp256r1 3
+#define uECC_secp256k1 4
+#ifndef uECC_CURVE
+ #define uECC_CURVE uECC_secp256r1
+#endif
+
+/* uECC_SQUARE_FUNC - If enabled (defined as nonzero), this will cause a specific function to be used for (scalar) squaring
+ instead of the generic multiplication function. This will make things faster by about 8% but increases the code size. */
+#define uECC_SQUARE_FUNC 1
+
+#define uECC_CONCAT1(a, b) a##b
+#define uECC_CONCAT(a, b) uECC_CONCAT1(a, b)
+
+#define uECC_size_1 20 /* secp160r1 */
+#define uECC_size_2 24 /* secp192r1 */
+#define uECC_size_3 32 /* secp256r1 */
+#define uECC_size_4 32 /* secp256k1 */
+
+#define uECC_BYTES uECC_CONCAT(uECC_size_, uECC_CURVE)
+
+#ifdef __cplusplus
+extern "C"
{
- ecc_ec_mult(ecc_g_point_x, ecc_g_point_y, priv_key, pub_x, pub_y);
-}
-
-#ifdef TEST_INCLUDE
-//ec Functions
-void ecc_ec_add(const uint32_t *px, const uint32_t *py, const uint32_t *qx, const uint32_t *qy, uint32_t *Sx, uint32_t *Sy);
-void ecc_ec_double(const uint32_t *px, const uint32_t *py, uint32_t *Dx, uint32_t *Dy);
-
-//simple Functions for addition and substraction of big numbers
-uint32_t ecc_add( const uint32_t *x, const uint32_t *y, uint32_t *result, uint8_t length);
-uint32_t ecc_sub( const uint32_t *x, const uint32_t *y, uint32_t *result, uint8_t length);
-
-//field functions for big numbers
-int ecc_fieldAdd(const uint32_t *x, const uint32_t *y, const uint32_t *reducer, uint32_t *result);
-int ecc_fieldSub(const uint32_t *x, const uint32_t *y, const uint32_t *modulus, uint32_t *result);
-int ecc_fieldMult(const uint32_t *x, const uint32_t *y, uint32_t *result, uint8_t length);
-void ecc_fieldModP(uint32_t *A, const uint32_t *B);
-void ecc_fieldModO(const uint32_t *A, uint32_t *result, uint8_t length);
-void ecc_fieldInv(const uint32_t *A, const uint32_t *modulus, const uint32_t *reducer, uint32_t *B);
-
-//simple functions to work with the big numbers
-void ecc_copy(const uint32_t *from, uint32_t *to, uint8_t length);
-int ecc_isSame(const uint32_t *A, const uint32_t *B, uint8_t length);
-void ecc_setZero(uint32_t *A, const int length);
-int ecc_isOne(const uint32_t* A);
-void ecc_rshift(uint32_t* A);
-int ecc_isGreater(const uint32_t *A, const uint32_t *B, uint8_t length);
-
-#endif /* TEST_INCLUDE */
+#endif
+
+/* uECC_RNG_Function type
+The RNG function should fill p_size random bytes into p_dest. It should return 1 if
+p_dest was filled with random data, or 0 if the random data could not be generated.
+The filled-in values should be either truly random, or from a cryptographically-secure PRNG.
+
+A correctly functioning RNG function must be set (using uECC_set_rng()) before calling
+uECC_make_key() or uECC_sign().
+
+A correct RNG function is set by default when building for Windows, Linux, or OS X.
+If you are building on another POSIX-compliant system that supports /dev/random or /dev/urandom,
+you can define uECC_POSIX to use the predefined RNG. For embedded platforms there is no predefined
+RNG function; you must provide your own.
+*/
+typedef int (*uECC_RNG_Function)(uint8_t *p_dest, unsigned p_size);
+
+/* uECC_set_rng() function.
+Set the function that will be used to generate random bytes. The RNG function should
+return 1 if the random data was generated, or 0 if the random data could not be generated.
+
+On platforms where there is no predefined RNG function (eg embedded platforms), this must
+be called before uECC_make_key() or uECC_sign() are used.
+
+Inputs:
+ p_rng - The function that will be used to generate random bytes.
+*/
+void uECC_set_rng(uECC_RNG_Function p_rng);
+
+/* uECC_make_key() function.
+Create a public/private key pair.
+
+Outputs:
+ p_publicKey - Will be filled in with the public key.
+ p_privateKey - Will be filled in with the private key.
+
+Returns 1 if the key pair was generated successfully, 0 if an error occurred.
+*/
+int uECC_make_key(uint8_t p_publicKey[uECC_BYTES*2], uint8_t p_privateKey[uECC_BYTES]);
+
+/* uECC_shared_secret() function.
+Compute a shared secret given your secret key and someone else's public key.
+Note: It is recommended that you hash the result of uECC_shared_secret() before using it for symmetric encryption or HMAC.
+
+Inputs:
+ p_publicKey - The public key of the remote party.
+ p_privateKey - Your private key.
+
+Outputs:
+ p_secret - Will be filled in with the shared secret value.
+
+Returns 1 if the shared secret was generated successfully, 0 if an error occurred.
+*/
+int uECC_shared_secret(const uint8_t p_publicKey[uECC_BYTES*2], const uint8_t p_privateKey[uECC_BYTES], uint8_t p_secret[uECC_BYTES]);
+
+/* uECC_compress() function.
+Compress a public key.
+
+Inputs:
+ p_publicKey - The public key to compress.
+
+Outputs:
+ p_compressed - Will be filled in with the compressed public key.
+*/
+void uECC_compress(const uint8_t p_publicKey[uECC_BYTES*2], uint8_t p_compressed[uECC_BYTES+1]);
+
+/* uECC_decompress() function.
+Decompress a compressed public key.
+
+Inputs:
+ p_compressed - The compressed public key.
+
+Outputs:
+ p_publicKey - Will be filled in with the decompressed public key.
+*/
+void uECC_decompress(const uint8_t p_compressed[uECC_BYTES+1], uint8_t p_publicKey[uECC_BYTES*2]);
+
+/* uECC_sign() function.
+Generate an ECDSA signature for a given hash value.
+
+Usage: Compute a hash of the data you wish to sign (SHA-2 is recommended) and pass it in to
+this function along with your private key.
+
+Inputs:
+ p_privateKey - Your private key.
+ p_hash - The message hash to sign.
+
+Outputs:
+ p_signature - Will be filled in with the signature value.
+
+Returns 1 if the signature generated successfully, 0 if an error occurred.
+*/
+int uECC_sign(const uint8_t p_privateKey[uECC_BYTES], const uint8_t p_hash[uECC_BYTES], uint8_t p_signature[uECC_BYTES*2]);
+
+/* uECC_verify() function.
+Verify an ECDSA signature.
+
+Usage: Compute the hash of the signed data using the same hash as the signer and
+pass it to this function along with the signer's public key and the signature values (r and s).
+
+Inputs:
+ p_publicKey - The signer's public key
+ p_hash - The hash of the signed data.
+ p_signature - The signature value.
+
+Returns 1 if the signature is valid, 0 if it is invalid.
+*/
+int uECC_verify(const uint8_t p_publicKey[uECC_BYTES*2], const uint8_t p_hash[uECC_BYTES], const uint8_t p_signature[uECC_BYTES*2]);
+
+#ifdef __cplusplus
+} /* end of extern "C" */
+#endif
+
+#endif /* _MICRO_ECC_H_ */
projects / platform / upstream / iotivity.git / blobdiff