X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/700d8687944db0a48535f818b59b6c9859952c61..1523527f94c4c294d0c04d0fd3396ce7eda095e4:/client/crypto/libpcrypto.c

diff --git a/client/crypto/libpcrypto.c b/client/crypto/libpcrypto.c
index 030be15a..ebc1e987 100644
--- a/client/crypto/libpcrypto.c
+++ b/client/crypto/libpcrypto.c
@@ -16,8 +16,10 @@
 #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/sha512.h>
 #include <mbedtls/ctr_drbg.h>
 #include <mbedtls/entropy.h>
 #include <mbedtls/error.h>
@@ -105,6 +107,20 @@ int sha256hash(uint8_t *input, int length, uint8_t *hash) {
 	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_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;
@@ -208,6 +224,31 @@ 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;