1 files changed, 83 insertions, 0 deletions
diff --git a/src/hash.h b/src/hash.h
new file mode 100644
index 0000000..588325b
--- /dev/null
+++ b/src/hash.h
@@ -0,0 +1,83 @@
+/*
+ *  Exim - an Internet mail transport agent
+ *  Copyright (c) The Exim Maintainers 1995 - 2022
+ *
+ *  Hash interface functions
+ */
+
+#include "exim.h"
+
+#if !defined(HASH_H)	/* entire file */
+#define HASH_H
+
+#include "sha_ver.h"
+
+#ifdef SHA_OPENSSL
+# include <openssl/sha.h>
+#elif defined SHA_GNUTLS
+# include <gnutls/crypto.h>
+#elif defined(SHA_GCRYPT)
+# include <gcrypt.h>
+#elif defined(SHA_POLARSSL)
+# include "pdkim/pdkim.h"		/*XXX ugly */
+# include "pdkim/polarssl/sha1.h"
+# include "pdkim/polarssl/sha2.h"
+#endif
+
+
+/* Hash context for the exim_sha_* routines */
+
+typedef enum hashmethod {
+  HASH_BADTYPE,
+  HASH_NULL,
+  HASH_SHA1,
+
+  HASH_SHA2_256,
+  HASH_SHA2_384,
+  HASH_SHA2_512,
+
+  HASH_SHA3_224,
+  HASH_SHA3_256,
+  HASH_SHA3_384,
+  HASH_SHA3_512,
+} hashmethod;
+
+typedef struct {
+  hashmethod	method;
+  int		hashlen;
+
+#ifdef SHA_OPENSSL
+  union {
+    SHA_CTX      sha1;       /* SHA1 block                                */
+    SHA256_CTX   sha2_256;   /* SHA256 or 224 block                       */
+    SHA512_CTX   sha2_512;   /* SHA512 or 384 block                       */
+#ifdef EXIM_HAVE_SHA3
+    EVP_MD_CTX * mctx;	     /* SHA3 block				  */
+#endif
+  } u;
+
+#elif defined(SHA_GNUTLS)
+  gnutls_hash_hd_t sha;      /* Either SHA1 or SHA256 block               */
+
+#elif defined(SHA_GCRYPT)
+  gcry_md_hd_t sha;          /* Either SHA1 or SHA256 block               */
+
+#elif defined(SHA_POLARSSL)
+  union {
+    sha1_context sha1;       /* SHA1 block                                */
+    sha2_context sha2;       /* SHA256 block                              */
+  } u;
+
+#elif defined(SHA_NATIVE)
+  sha1 sha1;
+#endif
+
+} hctx;
+
+extern BOOL     exim_sha_init(hctx *, hashmethod);
+extern void     exim_sha_update(hctx *, const uschar *a, int);
+extern void     exim_sha_update_string(hctx *, const uschar *a);
+extern void     exim_sha_finish(hctx *, blob *);
+
+#endif
+/* End of File */