139 lines
3.5 KiB
C
139 lines
3.5 KiB
C
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#ifndef CCAN_CRYPTO_SHA512_H
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#define CCAN_CRYPTO_SHA512_H
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/* BSD-MIT - see LICENSE file for details */
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#include <stdint.h>
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#include <stdlib.h>
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/** Output length for `wally_sha512` */
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#define SHA512_LEN 64
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/* Uncomment this to use openssl's SHA512 routines (and link with -lcrypto) */
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/*#define CCAN_CRYPTO_SHA512_USE_OPENSSL 1*/
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#ifdef CCAN_CRYPTO_SHA512_USE_OPENSSL
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#include <openssl/sha.h>
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#endif
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/**
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* struct sha512 - structure representing a completed SHA512.
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* @u.u8: an unsigned char array.
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* @u.u64: a 64-bit integer array.
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*
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* Other fields may be added to the union in future.
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*/
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struct sha512 {
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union {
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uint64_t u64[8];
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unsigned char u8[64];
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} u;
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};
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/**
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* sha512 - return sha512 of an object.
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* @sha512: the sha512 to fill in
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* @p: pointer to memory,
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* @size: the number of bytes pointed to by @p
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*
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* The bytes pointed to by @p is SHA512 hashed into @sha512. This is
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* equivalent to sha512_init(), sha512_update() then sha512_done().
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*/
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void sha512(struct sha512 *sha, const void *p, size_t size);
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/**
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* struct sha512_ctx - structure to store running context for sha512
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*/
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struct sha512_ctx {
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#ifdef CCAN_CRYPTO_SHA512_USE_OPENSSL
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SHA512_CTX c;
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#else
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uint64_t s[8];
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union {
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uint64_t u64[16];
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unsigned char u8[128];
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} buf;
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size_t bytes;
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#endif
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};
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/**
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* sha512_init - initialize an SHA512 context.
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* @ctx: the sha512_ctx to initialize
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*
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* This must be called before sha512_update or sha512_done, or
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* alternately you can assign SHA512_INIT.
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*
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* If it was already initialized, this forgets anything which was
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* hashed before.
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*
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* Example:
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* static void hash_all(const char **arr, struct sha512 *hash)
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* {
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* size_t i;
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* struct sha512_ctx ctx;
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*
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* sha512_init(&ctx);
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* for (i = 0; arr[i]; i++)
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* sha512_update(&ctx, arr[i], strlen(arr[i]));
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* sha512_done(&ctx, hash);
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* }
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*/
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void sha512_init(struct sha512_ctx *ctx);
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/**
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* SHA512_INIT - initializer for an SHA512 context.
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*
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* This can be used to statically initialize an SHA512 context (instead
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* of sha512_init()).
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*
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* Example:
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* static void hash_all(const char **arr, struct sha512 *hash)
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* {
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* size_t i;
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* struct sha512_ctx ctx = SHA512_INIT;
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*
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* for (i = 0; arr[i]; i++)
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* sha512_update(&ctx, arr[i], strlen(arr[i]));
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* sha512_done(&ctx, hash);
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* }
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*/
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#ifdef CCAN_CRYPTO_SHA512_USE_OPENSSL
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{ { { 0x6a09e667f3bcc908ull, 0xbb67ae8584caa73bull, \
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0x3c6ef372fe94f82bull, 0xa54ff53a5f1d36f1ull, \
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0x510e527fade682d1ull, 0x9b05688c2b3e6c1full, \
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0x1f83d9abfb41bd6bull, 0x5be0cd19137e2179ull }, \
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0, 0, \
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{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, \
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0, 0x40 } }
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#else
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#define SHA512_INIT \
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{ { 0x6a09e667f3bcc908ull, 0xbb67ae8584caa73bull, \
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0x3c6ef372fe94f82bull, 0xa54ff53a5f1d36f1ull, \
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0x510e527fade682d1ull, 0x9b05688c2b3e6c1full, \
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0x1f83d9abfb41bd6bull, 0x5be0cd19137e2179ull }, \
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{ { 0 } }, 0 }
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#endif
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/**
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* sha512_update - include some memory in the hash.
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* @ctx: the sha512_ctx to use
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* @p: pointer to memory,
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* @size: the number of bytes pointed to by @p
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*
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* You can call this multiple times to hash more data, before calling
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* sha512_done().
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*/
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void sha512_update(struct sha512_ctx *ctx, const void *p, size_t size);
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/**
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* sha512_done - finish SHA512 and return the hash
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* @ctx: the sha512_ctx to complete
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* @res: the hash to return.
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*
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* Note that @ctx is *destroyed* by this, and must be reinitialized.
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* To avoid that, pass a copy instead.
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*/
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void sha512_done(struct sha512_ctx *sha512, struct sha512 *res);
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#endif /* CCAN_CRYPTO_SHA512_H */
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