int ssh_kdf(struct ssh_crypto_struct *crypto,
unsigned char *key, size_t key_len,
int key_type, unsigned char *output,
size_t requested_len)
{
EVP_KDF_CTX *ctx = EVP_KDF_CTX_new_id(EVP_KDF_SSHKDF);
int rc;
if (ctx == NULL) {
return -1;
}
rc = EVP_KDF_ctrl(ctx, EVP_KDF_CTRL_SET_MD,
sshkdf_digest_to_md(crypto->digest_type));
if (rc != 1) {
goto out;
}
rc = EVP_KDF_ctrl(ctx, EVP_KDF_CTRL_SET_KEY, key, key_len);
if (rc != 1) {
goto out;
}
rc = EVP_KDF_ctrl(ctx, EVP_KDF_CTRL_SET_SSHKDF_XCGHASH,
crypto->secret_hash, crypto->digest_len);
if (rc != 1) {
goto out;
}
rc = EVP_KDF_ctrl(ctx, EVP_KDF_CTRL_SET_SSHKDF_TYPE, key_type);
if (rc != 1) {
goto out;
}
rc = EVP_KDF_ctrl(ctx, EVP_KDF_CTRL_SET_SSHKDF_SESSION_ID,
crypto->session_id, crypto->digest_len);
if (rc != 1) {
goto out;
}
rc = EVP_KDF_derive(ctx, output, requested_len);
if (rc != 1) {
goto out;
}
out:
EVP_KDF_CTX_free(ctx);
if (rc < 0) {
return rc;
}
return 0;
}
int PKCS5_PBKDF2_HMAC(const char *pass, int passlen,
const unsigned char *salt, int saltlen, int iter,
const EVP_MD *digest, int keylen, unsigned char *out)
{
const char *empty = "";
int rv = 1;
EVP_KDF_CTX *kctx;
/* Keep documented behaviour. */
if (pass == NULL) {
pass = empty;
passlen = 0;
} else if (passlen == -1) {
passlen = strlen(pass);
}
if (salt == NULL && saltlen == 0)
salt = (unsigned char *)empty;
kctx = EVP_KDF_CTX_new_id(EVP_KDF_PBKDF2);
if (kctx == NULL)
return 0;
if (EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_PASS, pass, (size_t)passlen) != 1
|| EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_SALT,
salt, (size_t)saltlen) != 1
|| EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_ITER, iter) != 1
|| EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_MD, digest) != 1
|| EVP_KDF_derive(kctx, out, keylen) != 1)
rv = 0;
EVP_KDF_CTX_free(kctx);
# ifdef OPENSSL_DEBUG_PKCS5V2
fprintf(stderr, "Password:\n");
h__dump(pass, passlen);
fprintf(stderr, "Salt:\n");
h__dump(salt, saltlen);
fprintf(stderr, "Iteration count %d\n", iter);
fprintf(stderr, "Key:\n");
h__dump(out, keylen);
# endif
return rv;
}
int EVP_PBE_scrypt(const char *pass, size_t passlen,
const unsigned char *salt, size_t saltlen,
uint64_t N, uint64_t r, uint64_t p, uint64_t maxmem,
unsigned char *key, size_t keylen)
{
const char *empty = "";
int rv = 1;
EVP_KDF_CTX *kctx;
if (r > UINT32_MAX || p > UINT32_MAX) {
EVPerr(EVP_F_EVP_PBE_SCRYPT, EVP_R_PARAMETER_TOO_LARGE);
return 0;
}
/* Maintain existing behaviour. */
if (pass == NULL) {
pass = empty;
passlen = 0;
}
if (salt == NULL) {
salt = (const unsigned char *)empty;
saltlen = 0;
}
if (maxmem == 0)
maxmem = SCRYPT_MAX_MEM;
kctx = EVP_KDF_CTX_new_id(EVP_KDF_SCRYPT);
if (kctx == NULL)
return 0;
if (EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_PASS, pass, (size_t)passlen) != 1
|| EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_SALT,
salt, (size_t)saltlen) != 1
|| EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_SCRYPT_N, N) != 1
|| EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_SCRYPT_R, (uint32_t)r) != 1
|| EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_SCRYPT_P, (uint32_t)p) != 1
|| EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_MAXMEM_BYTES, maxmem) != 1
|| EVP_KDF_derive(kctx, key, keylen) != 1)
rv = 0;
EVP_KDF_CTX_free(kctx);
return rv;
}
