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