crypto: Add evp hashing function.

include/libssh/libcrypto.h

@@ -31,6 +31,10 @@
 #include <openssl/sha.h>
 #include <openssl/md5.h>
 #include <openssl/hmac.h>
+#ifdef HAVE_OPENSSL_ECC
+#include <openssl/evp.h>
+#endif
+
 typedef SHA_CTX* SHACTX;
 typedef SHA256_CTX* SHA256CTX;
 typedef MD5_CTX*  MD5CTX;
@@ -42,6 +46,10 @@ typedef HMAC_CTX* HMACCTX;
 #endif
 #define MD5_DIGEST_LEN MD5_DIGEST_LENGTH
 
+#ifdef HAVE_OPENSSL_ECC
+#define EVP_DIGEST_LEN EVP_MAX_MD_SIZE
+#endif
+
 #include <openssl/bn.h>
 #include <openssl/opensslv.h>
 #define OPENSSL_0_9_7b 0x0090702fL

include/libssh/libgcrypt.h

@@ -41,6 +41,8 @@ typedef gcry_md_hd_t HMACCTX;
 #define EVP_MAX_MD_SIZE 36
 #endif
 
+#define EVP_DIGEST_LEN EVP_MAX_MD_SIZE
+
 typedef gcry_mpi_t bignum;
 
 /* missing gcrypt functions */

include/libssh/wrapper.h

@@ -48,6 +48,8 @@ void sha1_final(unsigned char *md,SHACTX c);
 void sha1(unsigned char *digest,int len,unsigned char *hash);
 void sha256(unsigned char *digest, int len, unsigned char *hash);
 
+void evp(int nid, unsigned char *digest, int len, unsigned char *hash, unsigned int *hlen);
+
 ssh_mac_ctx ssh_mac_ctx_init(enum ssh_mac_e type);
 void ssh_mac_update(ssh_mac_ctx ctx, const void *data, unsigned long len);
 void ssh_mac_final(unsigned char *md, ssh_mac_ctx ctx);

src/libcrypto.c

@@ -97,6 +97,34 @@ void sha1(unsigned char *digest, int len, unsigned char *hash) {
   SHA1(digest, len, hash);
 }
 
+#ifdef HAVE_OPENSSL_ECC
+static const EVP_MD *nid_to_evpmd(int nid)
+{
+    switch (nid) {
+        case NID_X9_62_prime256v1:
+            return EVP_sha256();
+        case NID_secp384r1:
+            return EVP_sha384();
+        case NID_secp521r1:
+            return EVP_sha512();
+        default:
+            return NULL;
+    }
+
+    return NULL;
+}
+
+void evp(int nid, unsigned char *digest, int len, unsigned char *hash, unsigned int *hlen)
+{
+    const EVP_MD *evp_md = nid_to_evpmd(nid);
+    EVP_MD_CTX md;
+
+    EVP_DigestInit(&md, evp_md);
+    EVP_DigestUpdate(&md, digest, len);
+    EVP_DigestFinal(&md, hash, hlen);
+}
+#endif
+
 SHA256CTX sha256_init(void){
   SHA256CTX c = malloc(sizeof(*c));
   if (c == NULL) {