diff options
Diffstat (limited to 'lib/sha256.h')
| -rw-r--r-- | lib/sha256.h | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/lib/sha256.h b/lib/sha256.h new file mode 100644 index 0000000..508bce7 --- /dev/null +++ b/lib/sha256.h @@ -0,0 +1,136 @@ +/* Declarations of functions and data types used for SHA256 and SHA224 sum + library functions. + Copyright (C) 2005-2006, 2008-2023 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 + +/* This file uses HAVE_OPENSSL_SHA256. */ +# if !_GL_CONFIG_H_INCLUDED +# error "Please include config.h first." +# endif + +# include <stdio.h> +# include <stdint.h> + +# if HAVE_OPENSSL_SHA256 +# ifndef OPENSSL_API_COMPAT +# define OPENSSL_API_COMPAT 0x10101000L /* FIXME: Use OpenSSL 1.1+ API. */ +# endif +/* If <openssl/macros.h> would give a compile-time error, don't use OpenSSL. */ +# include <openssl/configuration.h> +# if (OPENSSL_CONFIGURED_API \ + < (OPENSSL_API_COMPAT < 0x900000L ? OPENSSL_API_COMPAT : \ + ((OPENSSL_API_COMPAT >> 28) & 0xF) * 10000 \ + + ((OPENSSL_API_COMPAT >> 20) & 0xFF) * 100 \ + + ((OPENSSL_API_COMPAT >> 12) & 0xFF))) +# undef HAVE_OPENSSL_SHA256 +# else +# include <openssl/sha.h> +# endif +# 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: + */ |