Add SHA2 algorithms for HMAC

BUG: https://red.libssh.org/issues/91

Reviewed-by: Andreas Schneider <asn@cryptomilk.org>

include/libssh/libcrypto.h

@@ -36,6 +36,8 @@
 
 typedef SHA_CTX* SHACTX;
 typedef SHA256_CTX* SHA256CTX;
+typedef SHA512_CTX* SHA384CTX;
+typedef SHA512_CTX* SHA512CTX;
 typedef MD5_CTX*  MD5CTX;
 typedef HMAC_CTX* HMACCTX;
 #ifdef HAVE_ECC
@@ -45,6 +47,9 @@ typedef void *EVPCTX;
 #endif
 
 #define SHA_DIGEST_LEN SHA_DIGEST_LENGTH
+#define SHA256_DIGEST_LEN SHA256_DIGEST_LENGTH
+#define SHA384_DIGEST_LEN SHA384_DIGEST_LENGTH
+#define SHA512_DIGEST_LEN SHA512_DIGEST_LENGTH
 #ifdef MD5_DIGEST_LEN
     #undef MD5_DIGEST_LEN
 #endif
@@ -84,6 +89,14 @@ SHA256CTX sha256_init(void);
 void sha256_update(SHA256CTX c, const void *data, unsigned long len);
 void sha256_final(unsigned char *md, SHA256CTX c);
 
+SHA384CTX sha384_init(void);
+void sha384_update(SHA384CTX c, const void *data, unsigned long len);
+void sha384_final(unsigned char *md, SHA384CTX c);
+
+SHA512CTX sha512_init(void);
+void sha512_update(SHA512CTX c, const void *data, unsigned long len);
+void sha512_final(unsigned char *md, SHA512CTX c);
+
 struct ssh_cipher_struct *ssh_get_ciphertab(void);
 
 #endif /* HAVE_LIBCRYPTO */

include/libssh/libgcrypt.h

@@ -27,6 +27,9 @@
 
 #include <gcrypt.h>
 typedef gcry_md_hd_t SHACTX;
+typedef gcry_md_hd_t SHA256CTX;
+typedef gcry_md_hd_t SHA384CTX;
+typedef gcry_md_hd_t SHA512CTX;
 typedef gcry_md_hd_t MD5CTX;
 typedef gcry_md_hd_t HMACCTX;
 typedef void *EVPCTX;
@@ -34,11 +37,14 @@ typedef void *EVPCTX;
 #define SHA_DIGEST_LEN SHA_DIGEST_LENGTH
 #define MD5_DIGEST_LEN 16
 #define SHA256_DIGEST_LENGTH 32
+#define SHA256_DIGEST_LEN SHA256_DIGEST_LENGTH
 #define SHA384_DIGEST_LENGTH 48
+#define SHA384_DIGEST_LEN SHA384_DIGEST_LENGTH
 #define SHA512_DIGEST_LENGTH 64
+#define SHA512_DIGEST_LEN SHA512_DIGEST_LENGTH
 
 #ifndef EVP_MAX_MD_SIZE
-#define EVP_MAX_MD_SIZE 36
+#define EVP_MAX_MD_SIZE 64
 #endif
 
 #define EVP_DIGEST_LEN EVP_MAX_MD_SIZE

include/libssh/wrapper.h

@@ -34,6 +34,9 @@ enum ssh_mac_e {
 
 enum ssh_hmac_e {
   SSH_HMAC_SHA1 = 1,
+  SSH_HMAC_SHA256,
+  SSH_HMAC_SHA384,
+  SSH_HMAC_SHA512,
   SSH_HMAC_MD5
 };
 
@@ -46,12 +49,27 @@ typedef struct ssh_mac_ctx_struct *ssh_mac_ctx;
 MD5CTX md5_init(void);
 void md5_update(MD5CTX c, const void *data, unsigned long len);
 void md5_final(unsigned char *md,MD5CTX c);
+
 SHACTX sha1_init(void);
 void sha1_update(SHACTX c, const void *data, unsigned long len);
 void sha1_final(unsigned char *md,SHACTX c);
 void sha1(unsigned char *digest,int len,unsigned char *hash);
+
+SHA256CTX sha256_init(void);
+void sha256_update(SHA256CTX c, const void *data, unsigned long len);
+void sha256_final(unsigned char *md,SHA256CTX c);
 void sha256(unsigned char *digest, int len, unsigned char *hash);
 
+SHA384CTX sha384_init(void);
+void sha384_update(SHA384CTX c, const void *data, unsigned long len);
+void sha384_final(unsigned char *md,SHA384CTX c);
+void sha384(unsigned char *digest, int len, unsigned char *hash);
+
+SHA512CTX sha512_init(void);
+void sha512_update(SHA512CTX c, const void *data, unsigned long len);
+void sha512_final(unsigned char *md,SHA512CTX c);
+void sha512(unsigned char *digest, int len, unsigned char *hash);
+
 void evp(int nid, unsigned char *digest, int len, unsigned char *hash, unsigned int *hlen);
 EVPCTX evp_init(int nid);
 void evp_update(EVPCTX ctx, const void *data, unsigned long len);

src/libcrypto.c

@@ -65,6 +65,8 @@ struct ssh_mac_ctx_struct {
   union {
     SHACTX sha1_ctx;
     SHA256CTX sha256_ctx;
+    SHA384CTX sha384_ctx;
+    SHA512CTX sha512_ctx;
   } ctx;
 };
 
@@ -181,6 +183,52 @@ void sha256(unsigned char *digest, int len, unsigned char *hash) {
   SHA256(digest, len, hash);
 }
 
+SHA384CTX sha384_init(void){
+  SHA384CTX c = malloc(sizeof(*c));
+  if (c == NULL) {
+    return NULL;
+  }
+  SHA384_Init(c);
+
+  return c;
+}
+
+void sha384_update(SHA384CTX c, const void *data, unsigned long len){
+  SHA384_Update(c,data,len);
+}
+
+void sha384_final(unsigned char *md, SHA384CTX c) {
+  SHA384_Final(md, c);
+  SAFE_FREE(c);
+}
+
+void sha384(unsigned char *digest, int len, unsigned char *hash) {
+  SHA384(digest, len, hash);
+}
+
+SHA512CTX sha512_init(void){
+  SHA512CTX c = malloc(sizeof(*c));
+  if (c == NULL) {
+    return NULL;
+  }
+  SHA512_Init(c);
+
+  return c;
+}
+
+void sha512_update(SHA512CTX c, const void *data, unsigned long len){
+  SHA512_Update(c,data,len);
+}
+
+void sha512_final(unsigned char *md, SHA512CTX c) {
+  SHA512_Final(md, c);
+  SAFE_FREE(c);
+}
+
+void sha512(unsigned char *digest, int len, unsigned char *hash) {
+  SHA512(digest, len, hash);
+}
+
 MD5CTX md5_init(void) {
   MD5CTX c = malloc(sizeof(*c));
   if (c == NULL) {
@@ -212,7 +260,11 @@ ssh_mac_ctx ssh_mac_ctx_init(enum ssh_mac_e type){
       ctx->ctx.sha256_ctx = sha256_init();
       return ctx;
     case SSH_MAC_SHA384:
+      ctx->ctx.sha384_ctx = sha384_init();
+      return ctx;
     case SSH_MAC_SHA512:
+      ctx->ctx.sha512_ctx = sha512_init();
+      return ctx;
     default:
       SAFE_FREE(ctx);
       return NULL;
@@ -228,7 +280,11 @@ void ssh_mac_update(ssh_mac_ctx ctx, const void *data, unsigned long len) {
       sha256_update(ctx->ctx.sha256_ctx, data, len);
       break;
     case SSH_MAC_SHA384:
+      sha384_update(ctx->ctx.sha384_ctx, data, len);
+      break;
     case SSH_MAC_SHA512:
+      sha512_update(ctx->ctx.sha512_ctx, data, len);
+      break;
     default:
       break;
   }
@@ -243,7 +299,11 @@ void ssh_mac_final(unsigned char *md, ssh_mac_ctx ctx) {
       sha256_final(md,ctx->ctx.sha256_ctx);
       break;
     case SSH_MAC_SHA384:
+      sha384_final(md,ctx->ctx.sha384_ctx);
+      break;
     case SSH_MAC_SHA512:
+      sha512_final(md,ctx->ctx.sha512_ctx);
+      break;
     default:
       break;
   }
@@ -266,6 +326,15 @@ HMACCTX hmac_init(const void *key, int len, enum ssh_hmac_e type) {
     case SSH_HMAC_SHA1:
       HMAC_Init(ctx, key, len, EVP_sha1());
       break;
+    case SSH_HMAC_SHA256:
+      HMAC_Init(ctx, key, len, EVP_sha256());
+      break;
+    case SSH_HMAC_SHA384:
+      HMAC_Init(ctx, key, len, EVP_sha384());
+      break;
+    case SSH_HMAC_SHA512:
+      HMAC_Init(ctx, key, len, EVP_sha512());
+      break;
     case SSH_HMAC_MD5:
       HMAC_Init(ctx, key, len, EVP_md5());
       break;

src/libgcrypt.c

@@ -69,10 +69,69 @@ void sha1(unsigned char *digest, int len, unsigned char *hash) {
   gcry_md_hash_buffer(GCRY_MD_SHA1, hash, digest, len);
 }
 
+SHA256CTX sha256_init(void) {
+  SHA256CTX ctx = NULL;
+  gcry_md_open(&ctx, GCRY_MD_SHA256, 0);
+
+  return ctx;
+}
+
+void sha256_update(SHACTX c, const void *data, unsigned long len) {
+  gcry_md_write(c, data, len);
+}
+
+void sha256_final(unsigned char *md, SHACTX c) {
+  gcry_md_final(c);
+  memcpy(md, gcry_md_read(c, 0), SHA256_DIGEST_LEN);
+  gcry_md_close(c);
+}
+
 void sha256(unsigned char *digest, int len, unsigned char *hash){
   gcry_md_hash_buffer(GCRY_MD_SHA256, hash, digest, len);
 }
 
+SHA384CTX sha384_init(void) {
+  SHA384CTX ctx = NULL;
+  gcry_md_open(&ctx, GCRY_MD_SHA384, 0);
+
+  return ctx;
+}
+
+void sha384_update(SHACTX c, const void *data, unsigned long len) {
+  gcry_md_write(c, data, len);
+}
+
+void sha384_final(unsigned char *md, SHACTX c) {
+  gcry_md_final(c);
+  memcpy(md, gcry_md_read(c, 0), SHA384_DIGEST_LEN);
+  gcry_md_close(c);
+}
+
+void sha384(unsigned char *digest, int len, unsigned char *hash) {
+  gcry_md_hash_buffer(GCRY_MD_SHA384, hash, digest, len);
+}
+
+SHA512CTX sha512_init(void) {
+  SHA512CTX ctx = NULL;
+  gcry_md_open(&ctx, GCRY_MD_SHA512, 0);
+
+  return ctx;
+}
+
+void sha512_update(SHACTX c, const void *data, unsigned long len) {
+  gcry_md_write(c, data, len);
+}
+
+void sha512_final(unsigned char *md, SHACTX c) {
+  gcry_md_final(c);
+  memcpy(md, gcry_md_read(c, 0), SHA512_DIGEST_LEN);
+  gcry_md_close(c);
+}
+
+void sha512(unsigned char *digest, int len, unsigned char *hash) {
+  gcry_md_hash_buffer(GCRY_MD_SHA512, hash, digest, len);
+}
+
 MD5CTX md5_init(void) {
   MD5CTX c = NULL;
   gcry_md_open(&c, GCRY_MD_MD5, 0);
@@ -124,13 +183,13 @@ void ssh_mac_final(unsigned char *md, ssh_mac_ctx ctx) {
       len=SHA_DIGEST_LEN;
       break;
     case SSH_MAC_SHA256:
-      len=SHA256_DIGEST_LENGTH;
+      len=SHA256_DIGEST_LEN;
       break;
     case SSH_MAC_SHA384:
-      len=SHA384_DIGEST_LENGTH;
+      len=SHA384_DIGEST_LEN;
       break;
     case SSH_MAC_SHA512:
-      len=SHA512_DIGEST_LENGTH;
+      len=SHA512_DIGEST_LEN;
       break;
   }
   gcry_md_final(ctx->ctx);
@@ -146,6 +205,15 @@ HMACCTX hmac_init(const void *key, int len, enum ssh_hmac_e type) {
     case SSH_HMAC_SHA1:
       gcry_md_open(&c, GCRY_MD_SHA1, GCRY_MD_FLAG_HMAC);
       break;
+    case SSH_HMAC_SHA256:
+      gcry_md_open(&c, GCRY_MD_SHA256, GCRY_MD_FLAG_HMAC);
+      break;
+    case SSH_HMAC_SHA384:
+      gcry_md_open(&c, GCRY_MD_SHA384, GCRY_MD_FLAG_HMAC);
+      break;
+    case SSH_HMAC_SHA512:
+      gcry_md_open(&c, GCRY_MD_SHA512, GCRY_MD_FLAG_HMAC);
+      break;
     case SSH_HMAC_MD5:
       gcry_md_open(&c, GCRY_MD_MD5, GCRY_MD_FLAG_HMAC);
       break;