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public_key_from_pk

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This commit is contained in:
merlokk 2018-11-19 11:15:39 +02:00
commit 92cc9f5d25
2 changed files with 28 additions and 0 deletions
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26
client/crypto/libpcrypto.c
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@ -16,6 +16,7 @@
#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>
@ -208,6 +209,31 @@ char *ecdsa_get_error(int ret) {
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;

2
client/crypto/libpcrypto.h
View file

@ -14,6 +14,7 @@
#include <stdint.h>
#include <stdbool.h>
#include <stddef.h>
#include <mbedtls/pk.h>
extern int aes_encode(uint8_t *iv, uint8_t *key, uint8_t *input, uint8_t *output, int length);
extern int aes_decode(uint8_t *iv, uint8_t *key, uint8_t *input, uint8_t *output, int length);
@ -23,6 +24,7 @@ extern int aes_cmac8(uint8_t *iv, uint8_t *key, uint8_t *input, uint8_t *mac, in
extern int sha256hash(uint8_t *input, int length, uint8_t *hash);
extern int ecdsa_key_create(uint8_t * key_d, uint8_t *key_xy);
extern int ecdsa_public_key_from_pk(mbedtls_pk_context *pk, uint8_t *key, size_t keylen);
extern int ecdsa_signature_create(uint8_t *key_d, uint8_t *key_xy, uint8_t *input, int length, uint8_t *signature, size_t *signaturelen);
extern int ecdsa_signature_verify(uint8_t *key_xy, uint8_t *input, int length, uint8_t *signature, size_t signaturelen);
extern char *ecdsa_get_error(int ret);