#include <stdio.h>
#include <errno.h>
#include <openssl/buffer.h>
#include <openssl/evp.h>
#include "bio_local.h"
#include "evp_local.h"
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 = {
.type = BIO_TYPE_MD,
.name = "message digest",
.bwrite = md_write,
.bread = md_read,
.bgets = md_gets,
.ctrl = md_ctrl,
.create = md_new,
.destroy = md_free,
.callback_ctrl = md_callback_ctrl
};
const BIO_METHOD *
BIO_f_md(void)
{
return (&methods_md);
}
LCRYPTO_ALIAS(BIO_f_md);
static int
md_new(BIO *bi)
{
EVP_MD_CTX *ctx;
ctx = EVP_MD_CTX_create();
if (ctx == NULL)
return (0);
bi->init = 0;
bi->ptr = (char *)ctx;
bi->flags = 0;
return (1);
}
static int
md_free(BIO *a)
{
if (a == NULL)
return (0);
EVP_MD_CTX_destroy(a->ptr);
a->ptr = NULL;
a->init = 0;
a->flags = 0;
return (1);
}
static int
md_read(BIO *b, char *out, int outl)
{
int ret = 0;
EVP_MD_CTX *ctx;
if (out == NULL)
return (0);
ctx = b->ptr;
if ((ctx == NULL) || (b->next_bio == NULL))
return (0);
ret = BIO_read(b->next_bio, out, outl);
if (b->init) {
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;
if ((in == NULL) || (inl <= 0))
return (0);
ctx = b->ptr;
if ((ctx != NULL) && (b->next_bio != NULL))
ret = BIO_write(b->next_bio, in, inl);
if (b->init) {
if (ret > 0) {
if (!EVP_DigestUpdate(ctx, (const unsigned char *)in,
(unsigned int)ret)) {
BIO_clear_retry_flags(b);
return 0;
}
}
}
if (b->next_bio != 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;
ctx = b->ptr;
switch (cmd) {
case BIO_CTRL_RESET:
if (b->init)
ret = EVP_DigestInit_ex(ctx, ctx->digest, NULL);
else
ret = 0;
if (ret > 0)
ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
break;
case BIO_C_GET_MD:
if (b->init) {
ppmd = ptr;
*ppmd = ctx->digest;
} else
ret = 0;
break;
case BIO_C_GET_MD_CTX:
pctx = ptr;
*pctx = ctx;
b->init = 1;
break;
case BIO_C_SET_MD_CTX:
if (b->init)
b->ptr = ptr;
else
ret = 0;
break;
case BIO_C_DO_STATE_MACHINE:
BIO_clear_retry_flags(b);
ret = BIO_ctrl(b->next_bio, 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)
b->init = 1;
break;
case BIO_CTRL_DUP:
dbio = ptr;
dctx = dbio->ptr;
if (!EVP_MD_CTX_copy_ex(dctx, ctx))
return 0;
b->init = 1;
break;
default:
ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
break;
}
return (ret);
}
static long
md_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
{
long ret = 1;
if (b->next_bio == NULL)
return (0);
switch (cmd) {
default:
ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
break;
}
return (ret);
}
static int
md_gets(BIO *bp, char *buf, int size)
{
EVP_MD_CTX *ctx;
unsigned int ret;
ctx = bp->ptr;
if (size < ctx->digest->md_size)
return (0);
if (EVP_DigestFinal_ex(ctx, (unsigned char *)buf, &ret) <= 0)
return -1;
return ((int)ret);
}
