summaryrefslogtreecommitdiffstats
path: root/lib/sha256.h
diff options
context:
space:
mode:
Diffstat (limited to 'lib/sha256.h')
-rw-r--r--lib/sha256.h118
1 files changed, 118 insertions, 0 deletions
diff --git a/lib/sha256.h b/lib/sha256.h
new file mode 100644
index 0000000..dc9d87e
--- /dev/null
+++ b/lib/sha256.h
@@ -0,0 +1,118 @@
+/* Declarations of functions and data types used for SHA256 and SHA224 sum
+ library functions.
+ Copyright (C) 2005-2006, 2008-2022 Free Software Foundation, Inc.
+
+ This file is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as
+ published by the Free Software Foundation; either version 2.1 of the
+ License, or (at your option) any later version.
+
+ This file 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 Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
+
+#ifndef SHA256_H
+# define SHA256_H 1
+
+# include <stdio.h>
+# include <stdint.h>
+
+# if HAVE_OPENSSL_SHA256
+# include <openssl/sha.h>
+# endif
+
+# ifdef __cplusplus
+extern "C" {
+# endif
+
+enum { SHA224_DIGEST_SIZE = 224 / 8 };
+enum { SHA256_DIGEST_SIZE = 256 / 8 };
+
+# if HAVE_OPENSSL_SHA256
+# define GL_OPENSSL_NAME 224
+# include "gl_openssl.h"
+# define GL_OPENSSL_NAME 256
+# include "gl_openssl.h"
+# else
+/* Structure to save state of computation between the single steps. */
+struct sha256_ctx
+{
+ uint32_t state[8];
+
+ uint32_t total[2];
+ size_t buflen; /* ≥ 0, ≤ 128 */
+ uint32_t buffer[32]; /* 128 bytes; the first buflen bytes are in use */
+};
+
+/* Initialize structure containing state of computation. */
+extern void sha256_init_ctx (struct sha256_ctx *ctx);
+extern void sha224_init_ctx (struct sha256_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 64!!! */
+extern void sha256_process_block (const void *buffer, size_t len,
+ struct sha256_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 64. */
+extern void sha256_process_bytes (const void *buffer, size_t len,
+ struct sha256_ctx *ctx);
+
+/* Process the remaining bytes in the buffer and put result from CTX
+ in first 32 (28) 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 *sha256_finish_ctx (struct sha256_ctx *ctx, void *restrict resbuf);
+extern void *sha224_finish_ctx (struct sha256_ctx *ctx, void *restrict resbuf);
+
+
+/* Put result from CTX in first 32 (28) 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 *sha256_read_ctx (const struct sha256_ctx *ctx,
+ void *restrict resbuf);
+extern void *sha224_read_ctx (const struct sha256_ctx *ctx,
+ void *restrict resbuf);
+
+
+/* Compute SHA256 (SHA224) 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 *sha256_buffer (const char *buffer, size_t len,
+ void *restrict resblock);
+extern void *sha224_buffer (const char *buffer, size_t len,
+ void *restrict resblock);
+
+# endif
+
+/* Compute SHA256 (SHA224) 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 32 (28) bytes
+ beginning at RESBLOCK. */
+extern int sha256_stream (FILE *stream, void *resblock);
+extern int sha224_stream (FILE *stream, void *resblock);
+
+
+# ifdef __cplusplus
+}
+# endif
+
+#endif
+
+/*
+ * Hey Emacs!
+ * Local Variables:
+ * coding: utf-8
+ * End:
+ */