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/*
* Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include <errno.h>
#include <openssl/buffer.h>
#include <openssl/evp.h>
#include "internal/bio.h"
/*
* BIO_put and BIO_get both add to the digest, BIO_gets returns the digest
*/
static int md_write(BIO *h, char const *buf, int num);
static int md_read(BIO *h, char *buf, int size);
static int md_gets(BIO *h, char *str, int size);
static long md_ctrl(BIO *h, int cmd, long arg1, void *arg2);
static int md_new(BIO *h);
static int md_free(BIO *data);
static long md_callback_ctrl(BIO *h, int cmd, BIO_info_cb *fp);
static const BIO_METHOD methods_md = {
BIO_TYPE_MD,
"message digest",
bwrite_conv,
md_write,
bread_conv,
md_read,
NULL, /* md_puts, */
md_gets,
md_ctrl,
md_new,
md_free,
md_callback_ctrl,
};
const BIO_METHOD *BIO_f_md(void)
{
return &methods_md;
}
static int md_new(BIO *bi)
{
EVP_MD_CTX *ctx;
ctx = EVP_MD_CTX_new();
if (ctx == NULL)
return 0;
BIO_set_init(bi, 1);
BIO_set_data(bi, ctx);
return 1;
}
static int md_free(BIO *a)
{
if (a == NULL)
return 0;
EVP_MD_CTX_free(BIO_get_data(a));
BIO_set_data(a, NULL);
BIO_set_init(a, 0);
return 1;
}
static int md_read(BIO *b, char *out, int outl)
{
int ret = 0;
EVP_MD_CTX *ctx;
BIO *next;
if (out == NULL)
return 0;
ctx = BIO_get_data(b);
next = BIO_next(b);
if ((ctx == NULL) || (next == NULL))
return 0;
ret = BIO_read(next, out, outl);
if (BIO_get_init(b)) {
if (ret > 0) {
if (EVP_DigestUpdate(ctx, (unsigned char *)out,
(unsigned int)ret) <= 0)
return -1;
}
}
BIO_clear_retry_flags(b);
BIO_copy_next_retry(b);
return ret;
}
static int md_write(BIO *b, const char *in, int inl)
{
int ret = 0;
EVP_MD_CTX *ctx;
BIO *next;
if ((in == NULL) || (inl <= 0))
return 0;
ctx = BIO_get_data(b);
next = BIO_next(b);
if ((ctx != NULL) && (next != NULL))
ret = BIO_write(next, in, inl);
if (BIO_get_init(b)) {
if (ret > 0) {
if (!EVP_DigestUpdate(ctx, (const unsigned char *)in,
(unsigned int)ret)) {
BIO_clear_retry_flags(b);
return 0;
}
}
}
if (next != NULL) {
BIO_clear_retry_flags(b);
BIO_copy_next_retry(b);
}
return ret;
}
static long md_ctrl(BIO *b, int cmd, long num, void *ptr)
{
EVP_MD_CTX *ctx, *dctx, **pctx;
const EVP_MD **ppmd;
EVP_MD *md;
long ret = 1;
BIO *dbio, *next;
ctx = BIO_get_data(b);
next = BIO_next(b);
switch (cmd) {
case BIO_CTRL_RESET:
if (BIO_get_init(b))
ret = EVP_DigestInit_ex(ctx, EVP_MD_CTX_get0_md(ctx), NULL);
else
ret = 0;
if (ret > 0)
ret = BIO_ctrl(next, cmd, num, ptr);
break;
case BIO_C_GET_MD:
if (BIO_get_init(b)) {
ppmd = ptr;
*ppmd = EVP_MD_CTX_get0_md(ctx);
} else
ret = 0;
break;
case BIO_C_GET_MD_CTX:
pctx = ptr;
*pctx = ctx;
BIO_set_init(b, 1);
break;
case BIO_C_SET_MD_CTX:
if (BIO_get_init(b))
BIO_set_data(b, ptr);
else
ret = 0;
break;
case BIO_C_DO_STATE_MACHINE:
BIO_clear_retry_flags(b);
ret = BIO_ctrl(next, cmd, num, ptr);
BIO_copy_next_retry(b);
break;
case BIO_C_SET_MD:
md = ptr;
ret = EVP_DigestInit_ex(ctx, md, NULL);
if (ret > 0)
BIO_set_init(b, 1);
break;
case BIO_CTRL_DUP:
dbio = ptr;
dctx = BIO_get_data(dbio);
if (!EVP_MD_CTX_copy_ex(dctx, ctx))
return 0;
BIO_set_init(b, 1);
break;
default:
ret = BIO_ctrl(next, cmd, num, ptr);
break;
}
return ret;
}
static long md_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
{
BIO *next;
next = BIO_next(b);
if (next == NULL)
return 0;
return BIO_callback_ctrl(next, cmd, fp);
}
static int md_gets(BIO *bp, char *buf, int size)
{
EVP_MD_CTX *ctx;
unsigned int ret;
ctx = BIO_get_data(bp);
if (size < EVP_MD_CTX_get_size(ctx))
return 0;
if (EVP_DigestFinal_ex(ctx, (unsigned char *)buf, &ret) <= 0)
return -1;
return (int)ret;
}
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