[proxmark3-svn] / client / crypto / libpcrypto.c

//-----------------------------------------------------------------------------
// Copyright (C) 2018 Merlok
// Copyright (C) 2018 drHatson
//
// This code is licensed to you under the terms of the GNU GPL, version 2 or,
// at your option, any later version. See the LICENSE.txt file for the text of
// the license.
//-----------------------------------------------------------------------------
// crypto commands
//-----------------------------------------------------------------------------

#include "crypto/libpcrypto.h"
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <mbedtls/asn1.h>
#include <mbedtls/aes.h>
#include <mbedtls/cmac.h>
#include <mbedtls/pk.h>
#include <mbedtls/ecdsa.h>
#include <mbedtls/sha256.h>
#include <mbedtls/ctr_drbg.h>
#include <mbedtls/entropy.h>
#include <mbedtls/error.h>
#include <crypto/asn1utils.h>
#include <util.h>

// NIST Special Publication 800-38A — Recommendation for block cipher modes of operation: methods and techniques, 2001.
int aes_encode(uint8_t *iv, uint8_t *key, uint8_t *input, uint8_t *output, int length){
	uint8_t iiv[16] = {0};
	if (iv)
		memcpy(iiv, iv, 16);
	
	mbedtls_aes_context aes;
	mbedtls_aes_init(&aes);
	if (mbedtls_aes_setkey_enc(&aes, key, 128))
		return 1;
	if (mbedtls_aes_crypt_cbc(&aes, MBEDTLS_AES_ENCRYPT, length, iiv, input, output))
		return 2;
	mbedtls_aes_free(&aes);

	return 0;
}

int aes_decode(uint8_t *iv, uint8_t *key, uint8_t *input, uint8_t *output, int length){
	uint8_t iiv[16] = {0};
	if (iv)
		memcpy(iiv, iv, 16);
	
	mbedtls_aes_context aes;
	mbedtls_aes_init(&aes);
	if (mbedtls_aes_setkey_dec(&aes, key, 128))
		return 1;
	if (mbedtls_aes_crypt_cbc(&aes, MBEDTLS_AES_DECRYPT, length, iiv, input, output))
		return 2;
	mbedtls_aes_free(&aes);

	return 0;
}

// NIST Special Publication 800-38B — Recommendation for block cipher modes of operation: The CMAC mode for authentication.
// https://csrc.nist.gov/CSRC/media/Projects/Cryptographic-Standards-and-Guidelines/documents/examples/AES_CMAC.pdf
int aes_cmac(uint8_t *iv, uint8_t *key, uint8_t *input, uint8_t *mac, int length) {
	memset(mac, 0x00, 16);
	
	//  NIST 800-38B 
	return mbedtls_aes_cmac_prf_128(key, MBEDTLS_AES_BLOCK_SIZE, input, length, mac);
}

int aes_cmac8(uint8_t *iv, uint8_t *key, uint8_t *input, uint8_t *mac, int length) {
	uint8_t cmac[16] = {0};
	memset(mac, 0x00, 8);
	
	int res = aes_cmac(iv, key, input, cmac, length);
	if (res)
		return res;
	
	for(int i = 0; i < 8; i++) 
		mac[i] = cmac[i * 2 + 1];

	return 0;
}

static uint8_t fixed_rand_value[250] = {0};
static int fixed_rand(void *rng_state, unsigned char *output, size_t len) {
	if (len <= 250) {
		memcpy(output, fixed_rand_value, len);
	} else {
		memset(output, 0x00, len);
	}
	
	return 0;
}

int sha256hash(uint8_t *input, int length, uint8_t *hash) {
	if (!hash || !input)
		return 1;
	
	mbedtls_sha256_context sctx;
	mbedtls_sha256_init(&sctx);
	mbedtls_sha256_starts(&sctx, 0); // SHA-256, not 224 
	mbedtls_sha256_update(&sctx, input, length);
	mbedtls_sha256_finish(&sctx, hash);	
	mbedtls_sha256_free(&sctx);
	
	return 0;
}

int ecdsa_init_str(mbedtls_ecdsa_context *ctx, char * key_d, char *key_x, char *key_y) {
	if (!ctx)
		return 1;
	
	int res;

	mbedtls_ecdsa_init(ctx);
	res = mbedtls_ecp_group_load(&ctx->grp, MBEDTLS_ECP_DP_SECP256R1); // secp256r1
	if (res) 
		return res;
	
	if (key_d) {
		res = mbedtls_mpi_read_string(&ctx->d, 16, key_d);
		if (res) 
			return res;
	}
	
	if (key_x && key_y) {
		res = mbedtls_ecp_point_read_string(&ctx->Q, 16, key_x, key_y);
		if (res) 
			return res;
	}
	
	return 0;
}

int ecdsa_init(mbedtls_ecdsa_context *ctx, uint8_t * key_d, uint8_t *key_xy) {
	if (!ctx)
		return 1;
	
	int res;

	mbedtls_ecdsa_init(ctx);
	res = mbedtls_ecp_group_load(&ctx->grp, MBEDTLS_ECP_DP_SECP256R1); // secp256r1
	if (res) 
		return res;
	
	if (key_d) {
		res = mbedtls_mpi_read_binary(&ctx->d, key_d, 32);
		if (res) 
			return res;
	}
	
	if (key_xy) {
		res = mbedtls_ecp_point_read_binary(&ctx->grp, &ctx->Q, key_xy, 32 * 2 + 1);
		if (res) 
			return res;
	}
	
	return 0;
}

int ecdsa_key_create(uint8_t * key_d, uint8_t *key_xy) {
	int res;
	mbedtls_ecdsa_context ctx;
	ecdsa_init(&ctx, NULL, NULL);


    mbedtls_entropy_context entropy;
    mbedtls_ctr_drbg_context ctr_drbg;
	const char *pers = "ecdsaproxmark";

    mbedtls_entropy_init(&entropy);
    mbedtls_ctr_drbg_init(&ctr_drbg);

    res = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy, (const unsigned char *)pers, strlen(pers));
	if (res)
        goto exit;

    res = mbedtls_ecdsa_genkey(&ctx, MBEDTLS_ECP_DP_SECP256R1, mbedtls_ctr_drbg_random, &ctr_drbg);
	if (res)
		goto exit;

	res = mbedtls_mpi_write_binary(&ctx.d, key_d, 32);
	if (res)
		goto exit;

	size_t keylen = 0;
	uint8_t public_key[200] = {0};
	res = mbedtls_ecp_point_write_binary(&ctx.grp, &ctx.Q, MBEDTLS_ECP_PF_UNCOMPRESSED, &keylen, public_key, sizeof(public_key));
	if (res)
		goto exit;
	
	if (keylen != 65) { // 0x04 <key x 32b><key y 32b>
		res = 1;
		goto exit;
	}
	memcpy(key_xy, public_key, 65);

exit:
    mbedtls_entropy_free(&entropy);
    mbedtls_ctr_drbg_free(&ctr_drbg);
	mbedtls_ecdsa_free(&ctx);
	return res;
}

char *ecdsa_get_error(int ret) {
	static char retstr[300];
	memset(retstr, 0x00, sizeof(retstr));
	mbedtls_strerror(ret, retstr, sizeof(retstr));
	return retstr;
}

int ecdsa_public_key_from_pk(mbedtls_pk_context *pk, uint8_t *key, size_t keylen) {
	int res = 0;
	size_t realkeylen = 0;
	if (keylen < 65) 
		return 1;
	
	mbedtls_ecdsa_context ctx;
	mbedtls_ecdsa_init(&ctx);
	
	res = mbedtls_ecp_group_load(&ctx.grp, MBEDTLS_ECP_DP_SECP256R1); // secp256r1
	if (res)
		goto exit;
	
	res = mbedtls_ecdsa_from_keypair(&ctx, mbedtls_pk_ec(*pk) );
	if (res)
		goto exit;
	
	res = mbedtls_ecp_point_write_binary(&ctx.grp, &ctx.Q, MBEDTLS_ECP_PF_UNCOMPRESSED, &realkeylen, key, keylen);
	if (realkeylen != 65)
		res = 2;
exit:
	mbedtls_ecdsa_free(&ctx);
	return res;
}

int ecdsa_signature_create(uint8_t *key_d, uint8_t *key_xy, uint8_t *input, int length, uint8_t *signature, size_t *signaturelen) {
	int res;
	*signaturelen = 0;
	
	uint8_t shahash[32] = {0}; 
	res = sha256hash(input, length, shahash);
	if (res)
		return res;

    mbedtls_entropy_context entropy;
    mbedtls_ctr_drbg_context ctr_drbg;
	const char *pers = "ecdsaproxmark";

    mbedtls_entropy_init(&entropy);
    mbedtls_ctr_drbg_init(&ctr_drbg);

    res = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy, (const unsigned char *)pers, strlen(pers));
	if (res)
        goto exit;

	mbedtls_ecdsa_context ctx;	
	ecdsa_init(&ctx, key_d, key_xy);
	res = mbedtls_ecdsa_write_signature(&ctx, MBEDTLS_MD_SHA256, shahash, sizeof(shahash), signature, signaturelen, mbedtls_ctr_drbg_random, &ctr_drbg);
	
exit:
    mbedtls_ctr_drbg_free(&ctr_drbg);
	mbedtls_ecdsa_free(&ctx);
	return res;
}

int ecdsa_signature_create_test(char * key_d, char *key_x, char *key_y, char *random, uint8_t *input, int length, uint8_t *signature, size_t *signaturelen) {
	int res;
	*signaturelen = 0;
	
	uint8_t shahash[32] = {0}; 
	res = sha256hash(input, length, shahash);
	if (res)
		return res;

	int rndlen = 0;
	param_gethex_to_eol(random, 0, fixed_rand_value, sizeof(fixed_rand_value), &rndlen);
	
	mbedtls_ecdsa_context ctx;	
	ecdsa_init_str(&ctx, key_d, key_x, key_y);
	res = mbedtls_ecdsa_write_signature(&ctx, MBEDTLS_MD_SHA256, shahash, sizeof(shahash), signature, signaturelen, fixed_rand, NULL);
	
	mbedtls_ecdsa_free(&ctx);
	return res;
}

int ecdsa_signature_verify_keystr(char *key_x, char *key_y, uint8_t *input, int length, uint8_t *signature, size_t signaturelen) {
	int res;
	uint8_t shahash[32] = {0}; 
	res = sha256hash(input, length, shahash);
	if (res)
		return res;

	mbedtls_ecdsa_context ctx;	
	ecdsa_init_str(&ctx, NULL, key_x, key_y);
	res = mbedtls_ecdsa_read_signature(&ctx, shahash, sizeof(shahash), signature, signaturelen);
	
	mbedtls_ecdsa_free(&ctx);
	return res;
}

int ecdsa_signature_verify(uint8_t *key_xy, uint8_t *input, int length, uint8_t *signature, size_t signaturelen) {
	int res;
	uint8_t shahash[32] = {0}; 
	res = sha256hash(input, length, shahash);
	if (res)
		return res;

	mbedtls_ecdsa_context ctx;	
	ecdsa_init(&ctx, NULL, key_xy);
	res = mbedtls_ecdsa_read_signature(&ctx, shahash, sizeof(shahash), signature, signaturelen);
	
	mbedtls_ecdsa_free(&ctx);
	return res;
}

#define T_PRIVATE_KEY "C477F9F65C22CCE20657FAA5B2D1D8122336F851A508A1ED04E479C34985BF96"
#define T_Q_X         "B7E08AFDFE94BAD3F1DC8C734798BA1C62B3A0AD1E9EA2A38201CD0889BC7A19"
#define T_Q_Y         "3603F747959DBF7A4BB226E41928729063ADC7AE43529E61B563BBC606CC5E09"
#define T_K           "7A1A7E52797FC8CAAA435D2A4DACE39158504BF204FBE19F14DBB427FAEE50AE"
#define T_R           "2B42F576D07F4165FF65D1F3B1500F81E44C316F1F0B3EF57325B69ACA46104F"
#define T_S           "DC42C2122D6392CD3E3A993A89502A8198C1886FE69D262C4B329BDB6B63FAF1"

int ecdsa_nist_test(bool verbose) {
	int res;
	uint8_t input[] = "Example of ECDSA with P-256";
	int length = strlen((char *)input);
	uint8_t signature[300] = {0}; 
	size_t siglen = 0; 

	// NIST ecdsa test
	if (verbose)
		printf("  ECDSA NIST test: ");
	// make signature
	res = ecdsa_signature_create_test(T_PRIVATE_KEY, T_Q_X, T_Q_Y, T_K, input, length, signature, &siglen);
//	printf("res: %x signature[%x]: %s\n", (res<0)?-res:res, siglen, sprint_hex(signature, siglen));
	if (res) 
		goto exit;

	// check vectors
	uint8_t rval[300] = {0}; 
	uint8_t sval[300] = {0}; 
	res = ecdsa_asn1_get_signature(signature, siglen, rval, sval);
	if (res)
		goto exit;
	
	int slen = 0;
	uint8_t rval_s[33] = {0};
	param_gethex_to_eol(T_R, 0, rval_s, sizeof(rval_s), &slen);
	uint8_t sval_s[33] = {0}; 
	param_gethex_to_eol(T_S, 0, sval_s, sizeof(sval_s), &slen);
	if (strncmp((char *)rval, (char *)rval_s, 32) || strncmp((char *)sval, (char *)sval_s, 32)) {
		printf("R or S check error\n");
		res = 100;
		goto exit;
	}
	
	// verify signature
	res = ecdsa_signature_verify_keystr(T_Q_X, T_Q_Y, input, length, signature, siglen);
	if (res) 
		goto exit;
		
	// verify wrong signature
	input[0] ^= 0xFF;
	res = ecdsa_signature_verify_keystr(T_Q_X, T_Q_Y, input, length, signature, siglen);
	if (!res) {
		res = 1;
		goto exit;
	}
	if (verbose)
		printf("passed\n");

	// random ecdsa test
	if (verbose)
		printf("  ECDSA binary signature create/check test: ");

	uint8_t key_d[32] = {0};
	uint8_t key_xy[32 * 2 + 2] = {0};
	memset(signature, 0x00, sizeof(signature));
	siglen = 0;
	
	res = ecdsa_key_create(key_d, key_xy);
	if (res) 
		goto exit;

	res = ecdsa_signature_create(key_d, key_xy, input, length, signature, &siglen);
	if (res) 
		goto exit;

	res = ecdsa_signature_verify(key_xy, input, length, signature, siglen);
	if (res) 
		goto exit;

	input[0] ^= 0xFF;
	res = ecdsa_signature_verify(key_xy, input, length, signature, siglen);
	if (!res) 
		goto exit;
	
	if (verbose)
		printf("passed\n\n");
	
	return 0;
exit:
	if (verbose)
		printf("failed\n\n");
	return res;
}
Commit	Line	Data
700d8687 OM	1	//-----------------------------------------------------------------------------
	2	// Copyright (C) 2018 Merlok
	3	// Copyright (C) 2018 drHatson
	4	//
	5	// This code is licensed to you under the terms of the GNU GPL, version 2 or,
	6	// at your option, any later version. See the LICENSE.txt file for the text of
	7	// the license.
	8	//-----------------------------------------------------------------------------
	9	// crypto commands
	10	//-----------------------------------------------------------------------------
	11
	12	#include "crypto/libpcrypto.h"
	13	#include <stdlib.h>
	14	#include <unistd.h>
	15	#include <string.h>
	16	#include <mbedtls/asn1.h>
	17	#include <mbedtls/aes.h>
	18	#include <mbedtls/cmac.h>
6b882a39	19	#include <mbedtls/pk.h>
700d8687 OM	20	#include <mbedtls/ecdsa.h>
	21	#include <mbedtls/sha256.h>
	22	#include <mbedtls/ctr_drbg.h>
	23	#include <mbedtls/entropy.h>
	24	#include <mbedtls/error.h>
	25	#include <crypto/asn1utils.h>
	26	#include <util.h>
	27
	28	// NIST Special Publication 800-38A — Recommendation for block cipher modes of operation: methods and techniques, 2001.
	29	int aes_encode(uint8_t iv, uint8_t key, uint8_t input, uint8_t output, int length){
	30	uint8_t iiv[16] = {0};
	31	if (iv)
	32	memcpy(iiv, iv, 16);
	33
	34	mbedtls_aes_context aes;
	35	mbedtls_aes_init(&aes);
	36	if (mbedtls_aes_setkey_enc(&aes, key, 128))
	37	return 1;
	38	if (mbedtls_aes_crypt_cbc(&aes, MBEDTLS_AES_ENCRYPT, length, iiv, input, output))
	39	return 2;
	40	mbedtls_aes_free(&aes);
	41
	42	return 0;
	43	}
	44
	45	int aes_decode(uint8_t iv, uint8_t key, uint8_t input, uint8_t output, int length){
	46	uint8_t iiv[16] = {0};
	47	if (iv)
	48	memcpy(iiv, iv, 16);
	49
	50	mbedtls_aes_context aes;
	51	mbedtls_aes_init(&aes);
	52	if (mbedtls_aes_setkey_dec(&aes, key, 128))
	53	return 1;
	54	if (mbedtls_aes_crypt_cbc(&aes, MBEDTLS_AES_DECRYPT, length, iiv, input, output))
	55	return 2;
	56	mbedtls_aes_free(&aes);
	57
	58	return 0;
	59	}
	60
	61	// NIST Special Publication 800-38B — Recommendation for block cipher modes of operation: The CMAC mode for authentication.
	62	// https://csrc.nist.gov/CSRC/media/Projects/Cryptographic-Standards-and-Guidelines/documents/examples/AES_CMAC.pdf
	63	int aes_cmac(uint8_t iv, uint8_t key, uint8_t input, uint8_t mac, int length) {
	64	memset(mac, 0x00, 16);
	65
	66	// NIST 800-38B
	67	return mbedtls_aes_cmac_prf_128(key, MBEDTLS_AES_BLOCK_SIZE, input, length, mac);
	68	}
	69
	70	int aes_cmac8(uint8_t iv, uint8_t key, uint8_t input, uint8_t mac, int length) {
	71	uint8_t cmac[16] = {0};
	72	memset(mac, 0x00, 8);
	73
	74	int res = aes_cmac(iv, key, input, cmac, length);
	75	if (res)
	76	return res;
	77
	78	for(int i = 0; i < 8; i++)
	79	mac[i] = cmac[i * 2 + 1];
	80
	81	return 0;
	82	}
	83
84	static uint8_t fixed_rand_value[250] = {0};
85	static int fixed_rand(void rng_state, unsigned char output, size_t len) {
86	if (len <= 250) {
87	memcpy(output, fixed_rand_value, len);
88	} else {
89	memset(output, 0x00, len);
90	}
91
92	return 0;
93	}
94
95	int sha256hash(uint8_t input, int length, uint8_t hash) {
96	if (!hash \|\| !input)
97	return 1;
98
99	mbedtls_sha256_context sctx;
100	mbedtls_sha256_init(&sctx);
101	mbedtls_sha256_starts(&sctx, 0); // SHA-256, not 224
102	mbedtls_sha256_update(&sctx, input, length);
103	mbedtls_sha256_finish(&sctx, hash);
104	mbedtls_sha256_free(&sctx);
105
106	return 0;
107	}
108
109	int ecdsa_init_str(mbedtls_ecdsa_context ctx, char key_d, char key_x, char key_y) {
110	if (!ctx)
111	return 1;
112
113	int res;
114
115	mbedtls_ecdsa_init(ctx);
116	res = mbedtls_ecp_group_load(&ctx->grp, MBEDTLS_ECP_DP_SECP256R1); // secp256r1
117	if (res)
118	return res;
119
120	if (key_d) {
121	res = mbedtls_mpi_read_string(&ctx->d, 16, key_d);
122	if (res)
123	return res;
124	}
125
126	if (key_x && key_y) {
127	res = mbedtls_ecp_point_read_string(&ctx->Q, 16, key_x, key_y);
128	if (res)
129	return res;
130	}
131
132	return 0;
133	}
134
135	int ecdsa_init(mbedtls_ecdsa_context ctx, uint8_t key_d, uint8_t *key_xy) {
136	if (!ctx)
137	return 1;
138
139	int res;
140
141	mbedtls_ecdsa_init(ctx);
142	res = mbedtls_ecp_group_load(&ctx->grp, MBEDTLS_ECP_DP_SECP256R1); // secp256r1
143	if (res)
144	return res;
145
146	if (key_d) {
147	res = mbedtls_mpi_read_binary(&ctx->d, key_d, 32);
148	if (res)
149	return res;
150	}
151
152	if (key_xy) {
153	res = mbedtls_ecp_point_read_binary(&ctx->grp, &ctx->Q, key_xy, 32 * 2 + 1);
154	if (res)
155	return res;
156	}
157
158	return 0;
159	}
160
161	int ecdsa_key_create(uint8_t * key_d, uint8_t *key_xy) {
162	int res;
163	mbedtls_ecdsa_context ctx;
164	ecdsa_init(&ctx, NULL, NULL);
165
166
167	mbedtls_entropy_context entropy;
168	mbedtls_ctr_drbg_context ctr_drbg;
169	const char *pers = "ecdsaproxmark";
170
171	mbedtls_entropy_init(&entropy);
172	mbedtls_ctr_drbg_init(&ctr_drbg);
173
174	res = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy, (const unsigned char *)pers, strlen(pers));
175	if (res)
176	goto exit;
177
178	res = mbedtls_ecdsa_genkey(&ctx, MBEDTLS_ECP_DP_SECP256R1, mbedtls_ctr_drbg_random, &ctr_drbg);
179	if (res)
180	goto exit;
181
182	res = mbedtls_mpi_write_binary(&ctx.d, key_d, 32);
183	if (res)
184	goto exit;
185
186	size_t keylen = 0;
187	uint8_t public_key[200] = {0};
188	res = mbedtls_ecp_point_write_binary(&ctx.grp, &ctx.Q, MBEDTLS_ECP_PF_UNCOMPRESSED, &keylen, public_key, sizeof(public_key));
189	if (res)
190	goto exit;
191
192	if (keylen != 65) { // 0x04 <key x 32b><key y 32b>
193	res = 1;
194	goto exit;
195	}
196	memcpy(key_xy, public_key, 65);
197
198	exit:
199	mbedtls_entropy_free(&entropy);
200	mbedtls_ctr_drbg_free(&ctr_drbg);
201	mbedtls_ecdsa_free(&ctx);
202	return res;
203	}
204
205	char *ecdsa_get_error(int ret) {
206	static char retstr[300];
207	memset(retstr, 0x00, sizeof(retstr));
208	mbedtls_strerror(ret, retstr, sizeof(retstr));
209	return retstr;
210	}
211
6b882a39 OM	212	int ecdsa_public_key_from_pk(mbedtls_pk_context pk, uint8_t key, size_t keylen) {
	213	int res = 0;
	214	size_t realkeylen = 0;
	215	if (keylen < 65)
	216	return 1;
	217
	218	mbedtls_ecdsa_context ctx;
	219	mbedtls_ecdsa_init(&ctx);
	220
	221	res = mbedtls_ecp_group_load(&ctx.grp, MBEDTLS_ECP_DP_SECP256R1); // secp256r1
	222	if (res)
	223	goto exit;
	224
	225	res = mbedtls_ecdsa_from_keypair(&ctx, mbedtls_pk_ec(*pk) );
	226	if (res)
	227	goto exit;
	228
	229	res = mbedtls_ecp_point_write_binary(&ctx.grp, &ctx.Q, MBEDTLS_ECP_PF_UNCOMPRESSED, &realkeylen, key, keylen);
	230	if (realkeylen != 65)
	231	res = 2;
	232	exit:
	233	mbedtls_ecdsa_free(&ctx);
	234	return res;
	235	}
	236
700d8687 OM	237	int ecdsa_signature_create(uint8_t key_d, uint8_t key_xy, uint8_t input, int length, uint8_t signature, size_t *signaturelen) {
	238	int res;
	239	*signaturelen = 0;
	240
	241	uint8_t shahash[32] = {0};
	242	res = sha256hash(input, length, shahash);
	243	if (res)
	244	return res;
	245
	246	mbedtls_entropy_context entropy;
	247	mbedtls_ctr_drbg_context ctr_drbg;
	248	const char *pers = "ecdsaproxmark";
	249
	250	mbedtls_entropy_init(&entropy);
	251	mbedtls_ctr_drbg_init(&ctr_drbg);
	252
	253	res = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy, (const unsigned char *)pers, strlen(pers));
	254	if (res)
	255	goto exit;
	256
	257	mbedtls_ecdsa_context ctx;
	258	ecdsa_init(&ctx, key_d, key_xy);
	259	res = mbedtls_ecdsa_write_signature(&ctx, MBEDTLS_MD_SHA256, shahash, sizeof(shahash), signature, signaturelen, mbedtls_ctr_drbg_random, &ctr_drbg);
	260
	261	exit:
	262	mbedtls_ctr_drbg_free(&ctr_drbg);
	263	mbedtls_ecdsa_free(&ctx);
	264	return res;
	265	}
	266
	267	int ecdsa_signature_create_test(char * key_d, char key_x, char key_y, char random, uint8_t input, int length, uint8_t signature, size_t signaturelen) {
	268	int res;
	269	*signaturelen = 0;
	270
	271	uint8_t shahash[32] = {0};
	272	res = sha256hash(input, length, shahash);
	273	if (res)
	274	return res;
	275
	276	int rndlen = 0;
	277	param_gethex_to_eol(random, 0, fixed_rand_value, sizeof(fixed_rand_value), &rndlen);
	278
	279	mbedtls_ecdsa_context ctx;
	280	ecdsa_init_str(&ctx, key_d, key_x, key_y);
	281	res = mbedtls_ecdsa_write_signature(&ctx, MBEDTLS_MD_SHA256, shahash, sizeof(shahash), signature, signaturelen, fixed_rand, NULL);
	282
	283	mbedtls_ecdsa_free(&ctx);
	284	return res;
	285	}
	286
	287	int ecdsa_signature_verify_keystr(char key_x, char key_y, uint8_t input, int length, uint8_t signature, size_t signaturelen) {
	288	int res;
	289	uint8_t shahash[32] = {0};
	290	res = sha256hash(input, length, shahash);
	291	if (res)
	292	return res;
	293
	294	mbedtls_ecdsa_context ctx;
	295	ecdsa_init_str(&ctx, NULL, key_x, key_y);
	296	res = mbedtls_ecdsa_read_signature(&ctx, shahash, sizeof(shahash), signature, signaturelen);
	297
	298	mbedtls_ecdsa_free(&ctx);
	299	return res;
	300	}
301
302	int ecdsa_signature_verify(uint8_t key_xy, uint8_t input, int length, uint8_t *signature, size_t signaturelen) {
303	int res;
304	uint8_t shahash[32] = {0};
305	res = sha256hash(input, length, shahash);
306	if (res)
307	return res;
308
309	mbedtls_ecdsa_context ctx;
310	ecdsa_init(&ctx, NULL, key_xy);
311	res = mbedtls_ecdsa_read_signature(&ctx, shahash, sizeof(shahash), signature, signaturelen);
312
313	mbedtls_ecdsa_free(&ctx);
314	return res;
315	}
316
317	#define T_PRIVATE_KEY "C477F9F65C22CCE20657FAA5B2D1D8122336F851A508A1ED04E479C34985BF96"
318	#define T_Q_X "B7E08AFDFE94BAD3F1DC8C734798BA1C62B3A0AD1E9EA2A38201CD0889BC7A19"
319	#define T_Q_Y "3603F747959DBF7A4BB226E41928729063ADC7AE43529E61B563BBC606CC5E09"
320	#define T_K "7A1A7E52797FC8CAAA435D2A4DACE39158504BF204FBE19F14DBB427FAEE50AE"
321	#define T_R "2B42F576D07F4165FF65D1F3B1500F81E44C316F1F0B3EF57325B69ACA46104F"
322	#define T_S "DC42C2122D6392CD3E3A993A89502A8198C1886FE69D262C4B329BDB6B63FAF1"
323
324	int ecdsa_nist_test(bool verbose) {
325	int res;
326	uint8_t input[] = "Example of ECDSA with P-256";
327	int length = strlen((char *)input);
328	uint8_t signature[300] = {0};
329	size_t siglen = 0;
330
331	// NIST ecdsa test
332	if (verbose)
333	printf(" ECDSA NIST test: ");
334	// make signature
335	res = ecdsa_signature_create_test(T_PRIVATE_KEY, T_Q_X, T_Q_Y, T_K, input, length, signature, &siglen);
336	// printf("res: %x signature[%x]: %s\n", (res<0)?-res:res, siglen, sprint_hex(signature, siglen));
337	if (res)
338	goto exit;
339
340	// check vectors
341	uint8_t rval[300] = {0};
342	uint8_t sval[300] = {0};
343	res = ecdsa_asn1_get_signature(signature, siglen, rval, sval);
344	if (res)
345	goto exit;
346
347	int slen = 0;
348	uint8_t rval_s[33] = {0};
349	param_gethex_to_eol(T_R, 0, rval_s, sizeof(rval_s), &slen);
350	uint8_t sval_s[33] = {0};
351	param_gethex_to_eol(T_S, 0, sval_s, sizeof(sval_s), &slen);
352	if (strncmp((char )rval, (char )rval_s, 32) \|\| strncmp((char )sval, (char )sval_s, 32)) {
353	printf("R or S check error\n");
354	res = 100;
355	goto exit;
356	}
357
358	// verify signature
359	res = ecdsa_signature_verify_keystr(T_Q_X, T_Q_Y, input, length, signature, siglen);
360	if (res)
361	goto exit;
362
363	// verify wrong signature
364	input[0] ^= 0xFF;
365	res = ecdsa_signature_verify_keystr(T_Q_X, T_Q_Y, input, length, signature, siglen);
366	if (!res) {
367	res = 1;
368	goto exit;
369	}
370	if (verbose)
371	printf("passed\n");
372
373	// random ecdsa test
374	if (verbose)
375	printf(" ECDSA binary signature create/check test: ");
376
377	uint8_t key_d[32] = {0};
378	uint8_t key_xy[32 * 2 + 2] = {0};
379	memset(signature, 0x00, sizeof(signature));
380	siglen = 0;
381
382	res = ecdsa_key_create(key_d, key_xy);
383	if (res)
384	goto exit;
385
386	res = ecdsa_signature_create(key_d, key_xy, input, length, signature, &siglen);
387	if (res)
388	goto exit;
389
390	res = ecdsa_signature_verify(key_xy, input, length, signature, siglen);
391	if (res)
392	goto exit;
393
394	input[0] ^= 0xFF;
395	res = ecdsa_signature_verify(key_xy, input, length, signature, siglen);
396	if (!res)
397	goto exit;
398
399	if (verbose)
400	printf("passed\n\n");
401
402	return 0;
403	exit:
404	if (verbose)
405	printf("failed\n\n");
406	return res;
407	}