#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 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 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
+
+ // 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++)
+
+ 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_starts(&sctx, 0); // SHA-256, not 224
mbedtls_sha256_update(&sctx, input, length);
- mbedtls_sha256_finish(&sctx, hash);
+ mbedtls_sha256_finish(&sctx, hash);
mbedtls_sha256_free(&sctx);
-
+
return 0;
}
+
int sha512hash(uint8_t *input, int length, uint8_t *hash) {
if (!hash || !input)
return 1;
-
+
mbedtls_sha512_context sctx;
mbedtls_sha512_init(&sctx);
mbedtls_sha512_starts(&sctx, 0); //SHA-512, not 384
mbedtls_sha512_update(&sctx, input, length);
- mbedtls_sha512_finish(&sctx, hash);
+ mbedtls_sha512_finish(&sctx, hash);
mbedtls_sha512_free(&sctx);
-
+
return 0;
}
-int ecdsa_init_str(mbedtls_ecdsa_context *ctx, char * key_d, char *key_x, char *key_y) {
+
+int ecdsa_init_str(mbedtls_ecdsa_context *ctx, mbedtls_ecp_group_id curveID, 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)
+ res = mbedtls_ecp_group_load(&ctx->grp, curveID);
+ if (res)
return res;
-
+
if (key_d) {
res = mbedtls_mpi_read_string(&ctx->d, 16, key_d);
- if (res)
+ if (res)
return res;
}
-
+
if (key_x && key_y) {
res = mbedtls_ecp_point_read_string(&ctx->Q, 16, key_x, key_y);
- if (res)
+ if (res)
return res;
}
-
+
return 0;
}
-int ecdsa_init(mbedtls_ecdsa_context *ctx, uint8_t * key_d, uint8_t *key_xy) {
+
+int ecdsa_init(mbedtls_ecdsa_context *ctx, mbedtls_ecp_group_id curveID, 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)
+ res = mbedtls_ecp_group_load(&ctx->grp, curveID);
+ if (res)
return res;
-
+
+ size_t keylen = (ctx->grp.nbits + 7 ) / 8;
if (key_d) {
- res = mbedtls_mpi_read_binary(&ctx->d, key_d, 32);
- if (res)
+ res = mbedtls_mpi_read_binary(&ctx->d, key_d, keylen);
+ if (res)
return res;
}
-
+
if (key_xy) {
- res = mbedtls_ecp_point_read_binary(&ctx->grp, &ctx->Q, key_xy, 32 * 2 + 1);
- if (res)
+ res = mbedtls_ecp_point_read_binary(&ctx->grp, &ctx->Q, key_xy, keylen * 2 + 1);
+ if (res)
return res;
}
-
+
return 0;
}
-int ecdsa_key_create(uint8_t * key_d, uint8_t *key_xy) {
+
+int ecdsa_key_create(mbedtls_ecp_group_id curveID, uint8_t *key_d, uint8_t *key_xy) {
int res;
mbedtls_ecdsa_context ctx;
- ecdsa_init(&ctx, NULL, NULL);
+ ecdsa_init(&ctx, curveID, NULL, NULL);
- mbedtls_entropy_context entropy;
- mbedtls_ctr_drbg_context ctr_drbg;
+ mbedtls_entropy_context entropy;
+ mbedtls_ctr_drbg_context ctr_drbg;
const char *pers = "ecdsaproxmark";
- mbedtls_entropy_init(&entropy);
- mbedtls_ctr_drbg_init(&ctr_drbg);
+ 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));
+ res = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy, (const unsigned char *)pers, strlen(pers));
if (res)
- goto exit;
+ goto exit;
- res = mbedtls_ecdsa_genkey(&ctx, MBEDTLS_ECP_DP_SECP256R1, mbedtls_ctr_drbg_random, &ctr_drbg);
+ res = mbedtls_ecdsa_genkey(&ctx, curveID, mbedtls_ctr_drbg_random, &ctr_drbg);
if (res)
goto exit;
- res = mbedtls_mpi_write_binary(&ctx.d, key_d, 32);
+ size_t keylen = (ctx.grp.nbits + 7) / 8;
+ res = mbedtls_mpi_write_binary(&ctx.d, key_d, keylen);
if (res)
goto exit;
- size_t keylen = 0;
+ size_t public_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));
+ res = mbedtls_ecp_point_write_binary(&ctx.grp, &ctx.Q, MBEDTLS_ECP_PF_UNCOMPRESSED, &public_keylen, public_key, sizeof(public_key));
if (res)
goto exit;
-
- if (keylen != 65) { // 0x04 <key x 32b><key y 32b>
+
+ if (public_keylen != 1 + 2 * keylen) { // 0x04 <key x><key y>
res = 1;
goto exit;
}
- memcpy(key_xy, public_key, 65);
+ memcpy(key_xy, public_key, public_keylen);
exit:
- mbedtls_entropy_free(&entropy);
- mbedtls_ctr_drbg_free(&ctr_drbg);
+ 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));
return retstr;
}
-int ecdsa_public_key_from_pk(mbedtls_pk_context *pk, uint8_t *key, size_t keylen) {
+
+int ecdsa_public_key_from_pk(mbedtls_pk_context *pk, mbedtls_ecp_group_id curveID, 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
+
+ res = mbedtls_ecp_group_load(&ctx.grp, curveID);
if (res)
goto exit;
-
+
+ size_t private_keylen = (ctx.grp.nbits + 7) / 8;
+ if (keylen < 1 + 2 * private_keylen) {
+ res = 1;
+ 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)
+ if (realkeylen != 1 + 2 * private_keylen)
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 ecdsa_signature_create(mbedtls_ecp_group_id curveID, uint8_t *key_d, uint8_t *key_xy, uint8_t *input, int length, uint8_t *signature, size_t *signaturelen, bool hash) {
int res;
*signaturelen = 0;
-
- uint8_t shahash[32] = {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;
+ mbedtls_entropy_context entropy;
+ mbedtls_ctr_drbg_context ctr_drbg;
const char *pers = "ecdsaproxmark";
- mbedtls_entropy_init(&entropy);
- mbedtls_ctr_drbg_init(&ctr_drbg);
+ 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));
+ res = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy, (const unsigned char *)pers, strlen(pers));
if (res)
- goto exit;
+ goto exit;
+
+ mbedtls_ecdsa_context ctx;
+ ecdsa_init(&ctx, curveID, key_d, key_xy);
+ res = mbedtls_ecdsa_write_signature(&ctx, MBEDTLS_MD_SHA256, hash?shahash:input, hash?sizeof(shahash):length, signature, signaturelen, mbedtls_ctr_drbg_random, &ctr_drbg);
- 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_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 ecdsa_signature_create_test(mbedtls_ecp_group_id curveID, 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};
+
+ 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);
+
+ mbedtls_ecdsa_context ctx;
+ ecdsa_init_str(&ctx, curveID, 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 ecdsa_signature_verify_keystr(mbedtls_ecp_group_id curveID, char *key_x, char *key_y, uint8_t *input, int length, uint8_t *signature, size_t signaturelen, bool hash) {
int res;
- uint8_t shahash[32] = {0};
+ 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_context ctx;
+ ecdsa_init_str(&ctx, curveID, NULL, key_x, key_y);
+ res = mbedtls_ecdsa_read_signature(&ctx, hash?shahash:input, hash?sizeof(shahash):length, 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 ecdsa_signature_verify(mbedtls_ecp_group_id curveID, uint8_t *key_xy, uint8_t *input, int length, uint8_t *signature, size_t signaturelen, bool hash) {
int res;
- uint8_t shahash[32] = {0};
- res = sha256hash(input, length, shahash);
- if (res)
- return res;
+ uint8_t shahash[32] = {0};
+ if (hash) {
+ res = sha256hash(input, length, shahash);
+ if (res)
+ return res;
+ }
+
+ mbedtls_ecdsa_context ctx;
+ res = ecdsa_init(&ctx, curveID, NULL, key_xy);
+ res = mbedtls_ecdsa_read_signature(&ctx, hash?shahash:input, hash?sizeof(shahash):length, signature, signaturelen);
- 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;
}
+
+int ecdsa_signature_r_s_verify(mbedtls_ecp_group_id curveID, uint8_t *key_xy, uint8_t *input, int length, uint8_t *r_s, size_t r_s_len, bool hash) {
+ int res;
+ uint8_t signature[MBEDTLS_ECDSA_MAX_LEN];
+ size_t signature_len;
+
+ // convert r & s to ASN.1 signature
+ mbedtls_mpi r, s;
+ mbedtls_mpi_init(&r);
+ mbedtls_mpi_init(&s);
+ mbedtls_mpi_read_binary(&r, r_s, r_s_len/2);
+ mbedtls_mpi_read_binary(&s, r_s + r_s_len/2, r_s_len/2);
+
+ res = ecdsa_signature_to_asn1(&r, &s, signature, &signature_len);
+ if (res < 0) {
+ return res;
+ }
+
+ res = ecdsa_signature_verify(curveID, key_xy, input, length, signature, signature_len, hash);
+
+ mbedtls_mpi_free(&r);
+ mbedtls_mpi_free(&s);
+
+ return res;
+}
+
+
#define T_PRIVATE_KEY "C477F9F65C22CCE20657FAA5B2D1D8122336F851A508A1ED04E479C34985BF96"
#define T_Q_X "B7E08AFDFE94BAD3F1DC8C734798BA1C62B3A0AD1E9EA2A38201CD0889BC7A19"
#define T_Q_Y "3603F747959DBF7A4BB226E41928729063ADC7AE43529E61B563BBC606CC5E09"
int ecdsa_nist_test(bool verbose) {
int res;
uint8_t input[] = "Example of ECDSA with P-256";
+ mbedtls_ecp_group_id curveID = MBEDTLS_ECP_DP_SECP256R1;
int length = strlen((char *)input);
- uint8_t signature[300] = {0};
- size_t siglen = 0;
+ 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);
+ res = ecdsa_signature_create_test(curveID, 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)
+ if (res)
goto exit;
// check vectors
- uint8_t rval[300] = {0};
- uint8_t sval[300] = {0};
+ 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};
+ 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)
+ res = ecdsa_signature_verify_keystr(curveID, T_Q_X, T_Q_Y, input, length, signature, siglen, true);
+ 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);
+ res = ecdsa_signature_verify_keystr(curveID, T_Q_X, T_Q_Y, input, length, signature, siglen, true);
if (!res) {
res = 1;
goto exit;
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)
+
+ res = ecdsa_key_create(curveID, key_d, key_xy);
+ if (res)
goto exit;
- res = ecdsa_signature_create(key_d, key_xy, input, length, signature, &siglen);
- if (res)
+ res = ecdsa_signature_create(curveID, key_d, key_xy, input, length, signature, &siglen, true);
+ if (res)
goto exit;
- res = ecdsa_signature_verify(key_xy, input, length, signature, siglen);
- if (res)
+ res = ecdsa_signature_verify(curveID, key_xy, input, length, signature, siglen, true);
+ if (res)
goto exit;
input[0] ^= 0xFF;
- res = ecdsa_signature_verify(key_xy, input, length, signature, siglen);
- if (!res)
+ res = ecdsa_signature_verify(curveID, key_xy, input, length, signature, siglen, true);
+ if (!res)
goto exit;
-
+
if (verbose)
printf("passed\n\n");
-
+
return 0;
exit:
if (verbose)
projects / proxmark3-svn / blobdiff