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#include "proxy_helpers.h"
#include <openssl/evp.h>
static const char hex_digits[] = "0123456789abcdef";
int32_t proxy_hash(uint8_t *hash, size_t size,
int32_t (*feed)(void **, void *, int32_t), void *data)
{
EVP_MD_CTX *ctx;
void *ptr;
uint32_t bytes;
int32_t i, err, len;
if (size < 32) {
return proxy_log(LOG_ERR, ENOBUFS,
"Digest buffer is too small");
}
ctx = EVP_MD_CTX_new();
if (ctx == NULL) {
return proxy_log(LOG_ERR, ENOMEM, "EVP_MD_CTX_new() failed");
}
if (!EVP_DigestInit_ex2(ctx, EVP_sha256(), NULL)) {
err = proxy_log(LOG_ERR, ENOMEM, "EVP_DigestInit_ex2() failed");
goto done;
}
i = 0;
while ((len = feed(&ptr, data, i)) > 0) {
if (!EVP_DigestUpdate(ctx, ptr, len)) {
err = proxy_log(LOG_ERR, ENOMEM,
"EVP_DigestUpdate() failed");
goto done;
}
i++;
}
if (len < 0) {
err = len;
goto done;
}
if (!EVP_DigestFinal_ex(ctx, hash, &bytes)) {
err = proxy_log(LOG_ERR, ENOMEM, "EVP_DigestFinal_ex() failed");
goto done;
}
err = 0;
done:
EVP_MD_CTX_free(ctx);
return err;
}
int32_t proxy_hash_hex(char *digest, size_t size,
int32_t (*feed)(void **, void *, int32_t), void *data)
{
uint8_t hash[32];
int32_t i, err;
if (size < 65) {
return proxy_log(LOG_ERR, ENOBUFS,
"Digest buffer is too small");
}
err = proxy_hash(hash, sizeof(hash), feed, data);
if (err < 0) {
return err;
}
for (i = 0; i < 32; i++) {
*digest++ = hex_digits[hash[i] >> 4];
*digest++ = hex_digits[hash[i] & 15];
}
*digest = 0;
return 0;
}
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