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+/* Declarations of functions and data types used for SHA512 and SHA384 sum
+ library functions.
+ Copyright (C) 2005-2006, 2008-2020 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
+
+#ifndef SHA512_H
+# define SHA512_H 1
+
+# include <stdio.h>
+# include "u64.h"
+
+# if HAVE_OPENSSL_SHA512
+# include <openssl/sha.h>
+# endif
+
+# ifdef __cplusplus
+extern "C" {
+# endif
+
+enum { SHA384_DIGEST_SIZE = 384 / 8 };
+enum { SHA512_DIGEST_SIZE = 512 / 8 };
+
+# if HAVE_OPENSSL_SHA512
+# define GL_OPENSSL_NAME 384
+# include "gl_openssl.h"
+# define GL_OPENSSL_NAME 512
+# include "gl_openssl.h"
+# else
+/* Structure to save state of computation between the single steps. */
+struct sha512_ctx
+{
+ u64 state[8];
+
+ u64 total[2];
+ size_t buflen; /* ≥ 0, ≤ 256 */
+ u64 buffer[32]; /* 256 bytes; the first buflen bytes are in use */
+};
+
+/* Initialize structure containing state of computation. */
+extern void sha512_init_ctx (struct sha512_ctx *ctx);
+extern void sha384_init_ctx (struct sha512_ctx *ctx);
+
+/* Starting with the result of former calls of this function (or the
+ initialization function update the context for the next LEN bytes
+ starting at BUFFER.
+ It is necessary that LEN is a multiple of 128!!! */
+extern void sha512_process_block (const void *buffer, size_t len,
+ struct sha512_ctx *ctx);
+
+/* Starting with the result of former calls of this function (or the
+ initialization function update the context for the next LEN bytes
+ starting at BUFFER.
+ It is NOT required that LEN is a multiple of 128. */
+extern void sha512_process_bytes (const void *buffer, size_t len,
+ struct sha512_ctx *ctx);
+
+/* Process the remaining bytes in the buffer and put result from CTX
+ in first 64 (48) bytes following RESBUF. The result is always in little
+ endian byte order, so that a byte-wise output yields to the wanted
+ ASCII representation of the message digest. */
+extern void *sha512_finish_ctx (struct sha512_ctx *ctx, void *restrict resbuf);
+extern void *sha384_finish_ctx (struct sha512_ctx *ctx, void *restrict resbuf);
+
+
+/* Put result from CTX in first 64 (48) bytes following RESBUF. The result is
+ always in little endian byte order, so that a byte-wise output yields
+ to the wanted ASCII representation of the message digest.
+
+ IMPORTANT: On some systems it is required that RESBUF is correctly
+ aligned for a 32 bits value. */
+extern void *sha512_read_ctx (const struct sha512_ctx *ctx,
+ void *restrict resbuf);
+extern void *sha384_read_ctx (const struct sha512_ctx *ctx,
+ void *restrict resbuf);
+
+
+/* Compute SHA512 (SHA384) message digest for LEN bytes beginning at BUFFER.
+ The result is always in little endian byte order, so that a byte-wise
+ output yields to the wanted ASCII representation of the message
+ digest. */
+extern void *sha512_buffer (const char *buffer, size_t len,
+ void *restrict resblock);
+extern void *sha384_buffer (const char *buffer, size_t len,
+ void *restrict resblock);
+
+# endif
+/* Compute SHA512 (SHA384) message digest for bytes read from STREAM.
+ STREAM is an open file stream. Regular files are handled more efficiently.
+ The contents of STREAM from its current position to its end will be read.
+ The case that the last operation on STREAM was an 'ungetc' is not supported.
+ The resulting message digest number will be written into the 64 (48) bytes
+ beginning at RESBLOCK. */
+extern int sha512_stream (FILE *stream, void *resblock);
+extern int sha384_stream (FILE *stream, void *resblock);
+
+
+# ifdef __cplusplus
+}
+# endif
+
+#endif
+
+/*
+ * Hey Emacs!
+ * Local Variables:
+ * coding: utf-8
+ * End:
+ */