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#include <errno.h>
#include <stdio.h>
#include <fcntl.h>
#include <openssl/bio.h>
#include <openssl/pem.h>
#include <openssl/err.h>
#include "apk_crypto.h"
static const char *apk_digest_str[] = {
[APK_DIGEST_NONE] = "none",
[APK_DIGEST_MD5] = "md5",
[APK_DIGEST_SHA1] = "sha1",
[APK_DIGEST_SHA256_160] = "sha256-160",
[APK_DIGEST_SHA256] = "sha256",
[APK_DIGEST_SHA512] = "sha512",
};
const char *apk_digest_alg_str(uint8_t alg)
{
const char *alg_str = "unknown";
if (alg < ARRAY_SIZE(apk_digest_str))
alg_str = apk_digest_str[alg];
return alg_str;
}
int apk_digest_alg_len(uint8_t alg)
{
switch (alg) {
case APK_DIGEST_MD5: return 16;
case APK_DIGEST_SHA1: return 20;
case APK_DIGEST_SHA256_160: return 20;
case APK_DIGEST_SHA256: return 32;
case APK_DIGEST_SHA512: return 64;
default: return 0;
}
}
uint8_t apk_digest_alg_by_len(int len)
{
switch (len) {
case 0: return APK_DIGEST_NONE;
case 16: return APK_DIGEST_MD5;
case 20: return APK_DIGEST_SHA1;
case 32: return APK_DIGEST_SHA256;
case 64: return APK_DIGEST_SHA512;
default: return APK_DIGEST_NONE;
}
}
uint8_t apk_digest_alg_from_csum(int csum)
{
switch (csum) {
case APK_CHECKSUM_NONE: return APK_DIGEST_NONE;
case APK_CHECKSUM_MD5: return APK_DIGEST_MD5;
case APK_CHECKSUM_SHA1: return APK_DIGEST_SHA1;
default: return APK_DIGEST_NONE;
}
}
uint8_t apk_digest_from_blob(struct apk_digest *d, apk_blob_t b)
{
d->alg = apk_digest_alg_by_len(b.len);
d->len = 0;
if (d->alg != APK_DIGEST_NONE) {
d->len = b.len;
memcpy(d->data, b.ptr, d->len);
}
return d->alg;
}
int apk_pkey_init(struct apk_pkey *pkey, EVP_PKEY *key)
{
unsigned char dig[EVP_MAX_MD_SIZE], *pub = NULL;
unsigned int dlen = sizeof dig;
int len;
if ((len = i2d_PublicKey(key, &pub)) < 0) return -APKE_CRYPTO_ERROR;
EVP_Digest(pub, len, dig, &dlen, EVP_sha512(), NULL);
memcpy(pkey->id, dig, sizeof pkey->id);
OPENSSL_free(pub);
pkey->key = key;
return 0;
}
void apk_pkey_free(struct apk_pkey *pkey)
{
EVP_PKEY_free(pkey->key);
}
int apk_pkey_load(struct apk_pkey *pkey, int dirfd, const char *fn)
{
EVP_PKEY *key;
BIO *bio;
int fd;
fd = openat(dirfd, fn, O_RDONLY|O_CLOEXEC);
if (fd < 0) return -errno;
bio = BIO_new_fp(fdopen(fd, "r"), BIO_CLOSE);
if (!bio) return -ENOMEM;
key = PEM_read_bio_PUBKEY(bio, NULL, NULL, NULL);
if (!key) {
(void)BIO_reset(bio);
key = PEM_read_bio_PrivateKey(bio, NULL, NULL, NULL);
}
ERR_clear_error();
BIO_free(bio);
if (!key) return -APKE_CRYPTO_KEY_FORMAT;
apk_pkey_init(pkey, key);
return 0;
}
int apk_sign_start(struct apk_digest_ctx *dctx, struct apk_pkey *pkey)
{
if (EVP_MD_CTX_reset(dctx->mdctx) != 1 ||
EVP_DigestSignInit(dctx->mdctx, NULL, EVP_sha512(), NULL, pkey->key) != 1)
return -APKE_CRYPTO_ERROR;
return 0;
}
int apk_sign(struct apk_digest_ctx *dctx, void *sig, size_t *len)
{
if (EVP_DigestSignFinal(dctx->mdctx, sig, len) != 1) {
ERR_print_errors_fp(stderr);
return -APKE_SIGNATURE_FAIL;
}
return 0;
}
int apk_verify_start(struct apk_digest_ctx *dctx, struct apk_pkey *pkey)
{
if (EVP_MD_CTX_reset(dctx->mdctx) != 1 ||
EVP_DigestVerifyInit(dctx->mdctx, NULL, EVP_sha512(), NULL, pkey->key) != 1)
return -APKE_CRYPTO_ERROR;
return 0;
}
int apk_verify(struct apk_digest_ctx *dctx, void *sig, size_t len)
{
if (EVP_DigestVerifyFinal(dctx->mdctx, sig, len) != 1) {
ERR_print_errors_fp(stderr);
return -APKE_SIGNATURE_INVALID;
}
return 0;
}
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