diff options
Diffstat (limited to 'libnm-core/crypto.c')
| -rw-r--r-- | libnm-core/crypto.c | 816 |
1 files changed, 816 insertions, 0 deletions
diff --git a/libnm-core/crypto.c b/libnm-core/crypto.c new file mode 100644 index 00000000..205d22c6 --- /dev/null +++ b/libnm-core/crypto.c @@ -0,0 +1,816 @@ +/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */ + +/* + * Dan Williams <dcbw@redhat.com> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the + * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, + * Boston, MA 02110-1301 USA. + * + * Copyright 2007 - 2011 Red Hat, Inc. + */ + +#include "config.h" + +#include <glib.h> +#include <string.h> +#include <strings.h> +#include <unistd.h> +#include <stdlib.h> +#include <glib/gi18n-lib.h> + +#include "crypto.h" +#include "nm-errors.h" + +#define PEM_RSA_KEY_BEGIN "-----BEGIN RSA PRIVATE KEY-----" +#define PEM_RSA_KEY_END "-----END RSA PRIVATE KEY-----" + +#define PEM_DSA_KEY_BEGIN "-----BEGIN DSA PRIVATE KEY-----" +#define PEM_DSA_KEY_END "-----END DSA PRIVATE KEY-----" + +#define PEM_CERT_BEGIN "-----BEGIN CERTIFICATE-----" +#define PEM_CERT_END "-----END CERTIFICATE-----" + +#define PEM_PKCS8_ENC_KEY_BEGIN "-----BEGIN ENCRYPTED PRIVATE KEY-----" +#define PEM_PKCS8_ENC_KEY_END "-----END ENCRYPTED PRIVATE KEY-----" + +#define PEM_PKCS8_DEC_KEY_BEGIN "-----BEGIN PRIVATE KEY-----" +#define PEM_PKCS8_DEC_KEY_END "-----END PRIVATE KEY-----" + +static gboolean +find_tag (const char *tag, + const guint8 *data, + gsize data_len, + gsize start_at, + gsize *out_pos) +{ + gsize i, taglen; + gsize len = data_len - start_at; + + g_return_val_if_fail (out_pos != NULL, FALSE); + + taglen = strlen (tag); + if (len >= taglen) { + for (i = 0; i < len - taglen + 1; i++) { + if (memcmp (data + start_at + i, tag, taglen) == 0) { + *out_pos = start_at + i; + return TRUE; + } + } + } + return FALSE; +} + +#define DEK_INFO_TAG "DEK-Info: " +#define PROC_TYPE_TAG "Proc-Type: " + +static GByteArray * +parse_old_openssl_key_file (const guint8 *data, + gsize data_len, + NMCryptoKeyType *out_key_type, + char **out_cipher, + char **out_iv, + GError **error) +{ + GByteArray *bindata = NULL; + char **lines = NULL; + char **ln = NULL; + gsize start = 0, end = 0; + GString *str = NULL; + int enc_tags = 0; + NMCryptoKeyType key_type; + char *iv = NULL; + char *cipher = NULL; + unsigned char *tmp = NULL; + gsize tmp_len = 0; + const char *start_tag; + const char *end_tag; + guint8 save_end = 0; + + *out_key_type = NM_CRYPTO_KEY_TYPE_UNKNOWN; + *out_iv = NULL; + *out_cipher = NULL; + + if (find_tag (PEM_RSA_KEY_BEGIN, data, data_len, 0, &start)) { + key_type = NM_CRYPTO_KEY_TYPE_RSA; + start_tag = PEM_RSA_KEY_BEGIN; + end_tag = PEM_RSA_KEY_END; + } else if (find_tag (PEM_DSA_KEY_BEGIN, data, data_len, 0, &start)) { + key_type = NM_CRYPTO_KEY_TYPE_DSA; + start_tag = PEM_DSA_KEY_BEGIN; + end_tag = PEM_DSA_KEY_END; + } else + goto parse_error; + + start += strlen (start_tag); + if (!find_tag (end_tag, data, data_len, start, &end)) { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("PEM key file had no end tag '%s'."), + end_tag); + goto parse_error; + } + + save_end = data[end]; + ((guint8 *)data)[end] = '\0'; + lines = g_strsplit ((const char *) (data + start), "\n", 0); + ((guint8 *)data)[end] = save_end; + + if (!lines || g_strv_length (lines) <= 1) { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("Doesn't look like a PEM private key file.")); + goto parse_error; + } + + str = g_string_new_len (NULL, end - start); + for (ln = lines; *ln; ln++) { + char *p = *ln; + + /* Chug leading spaces */ + p = g_strstrip (p); + if (!*p) + continue; + + if (!strncmp (p, PROC_TYPE_TAG, strlen (PROC_TYPE_TAG))) { + if (enc_tags++ != 0 || str->len != 0) { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("Malformed PEM file: Proc-Type was not first tag.")); + goto parse_error; + } + + p += strlen (PROC_TYPE_TAG); + if (strcmp (p, "4,ENCRYPTED")) { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("Malformed PEM file: unknown Proc-Type tag '%s'."), + p); + goto parse_error; + } + } else if (!strncmp (p, DEK_INFO_TAG, strlen (DEK_INFO_TAG))) { + char *comma; + + if (enc_tags++ != 1 || str->len != 0) { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("Malformed PEM file: DEK-Info was not the second tag.")); + goto parse_error; + } + + p += strlen (DEK_INFO_TAG); + + /* Grab the IV first */ + comma = strchr (p, ','); + if (!comma || (*(comma + 1) == '\0')) { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("Malformed PEM file: no IV found in DEK-Info tag.")); + goto parse_error; + } + *comma++ = '\0'; + if (!g_ascii_isxdigit (*comma)) { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("Malformed PEM file: invalid format of IV in DEK-Info tag.")); + goto parse_error; + } + iv = g_strdup (comma); + + /* Get the private key cipher */ + if (!strcasecmp (p, "DES-EDE3-CBC")) { + cipher = g_strdup (p); + } else if (!strcasecmp (p, "DES-CBC")) { + cipher = g_strdup (p); + } else if (!strcasecmp (p, "AES-128-CBC")) { + cipher = g_strdup (p); + } else { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("Malformed PEM file: unknown private key cipher '%s'."), + p); + goto parse_error; + } + } else { + if (enc_tags == 1) { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + "Malformed PEM file: both Proc-Type and DEK-Info tags are required."); + goto parse_error; + } + g_string_append (str, p); + } + } + + tmp = g_base64_decode (str->str, &tmp_len); + if (tmp == NULL || !tmp_len) { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("Could not decode private key.")); + goto parse_error; + } + g_string_free (str, TRUE); + + if (lines) + g_strfreev (lines); + + bindata = g_byte_array_sized_new (tmp_len); + g_byte_array_append (bindata, tmp, tmp_len); + g_free (tmp); + + *out_key_type = key_type; + *out_iv = iv; + *out_cipher = cipher; + return bindata; + +parse_error: + g_free (tmp); + g_free (cipher); + g_free (iv); + if (str) + g_string_free (str, TRUE); + if (lines) + g_strfreev (lines); + return NULL; +} + +static GByteArray * +parse_pkcs8_key_file (const guint8 *data, + gsize data_len, + gboolean *out_encrypted, + GError **error) +{ + GByteArray *key = NULL; + gsize start = 0, end = 0; + unsigned char *der = NULL; + guint8 save_end; + gsize length = 0; + const char *start_tag = NULL, *end_tag = NULL; + gboolean encrypted = FALSE; + + /* Try encrypted first, decrypted next */ + if (find_tag (PEM_PKCS8_ENC_KEY_BEGIN, data, data_len, 0, &start)) { + start_tag = PEM_PKCS8_ENC_KEY_BEGIN; + end_tag = PEM_PKCS8_ENC_KEY_END; + encrypted = TRUE; + } else if (find_tag (PEM_PKCS8_DEC_KEY_BEGIN, data, data_len, 0, &start)) { + start_tag = PEM_PKCS8_DEC_KEY_BEGIN; + end_tag = PEM_PKCS8_DEC_KEY_END; + encrypted = FALSE; + } else { + g_set_error_literal (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("Failed to find expected PKCS#8 start tag.")); + return NULL; + } + + start += strlen (start_tag); + if (!find_tag (end_tag, data, data_len, start, &end)) { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("Failed to find expected PKCS#8 end tag '%s'."), + end_tag); + return NULL; + } + + /* g_base64_decode() wants a NULL-terminated string */ + save_end = data[end]; + ((guint8 *)data)[end] = '\0'; + der = g_base64_decode ((const char *) (data + start), &length); + ((guint8 *)data)[end] = save_end; + + if (der && length) { + key = g_byte_array_sized_new (length); + g_byte_array_append (key, der, length); + g_assert (key->len == length); + *out_encrypted = encrypted; + } else { + g_set_error_literal (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("Failed to decode PKCS#8 private key.")); + } + + g_free (der); + return key; +} + +static GByteArray * +file_to_g_byte_array (const char *filename, GError **error) +{ + char *contents; + GByteArray *array = NULL; + gsize length = 0; + + if (g_file_get_contents (filename, &contents, &length, error)) { + array = g_byte_array_sized_new (length); + g_byte_array_append (array, (guint8 *) contents, length); + g_assert (array->len == length); + g_free (contents); + } + return array; +} + +/* + * Convert a hex string into bytes. + */ +static char * +convert_iv (const char *src, + gsize *out_len, + GError **error) +{ + int num; + int i; + char conv[3]; + char *c; + + g_return_val_if_fail (src != NULL, NULL); + + num = strlen (src); + if (num % 2) { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("IV must be an even number of bytes in length.")); + return NULL; + } + + num /= 2; + c = g_malloc0 (num + 1); + + conv[2] = '\0'; + for (i = 0; i < num; i++) { + conv[0] = src[(i * 2)]; + conv[1] = src[(i * 2) + 1]; + if (!g_ascii_isxdigit (conv[0]) || !g_ascii_isxdigit (conv[1])) { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("IV contains non-hexadecimal digits.")); + goto error; + } + + c[i] = strtol(conv, NULL, 16); + } + *out_len = num; + return c; + +error: + g_free (c); + return NULL; +} + +char * +crypto_make_des_aes_key (const char *cipher, + const char *salt, + const gsize salt_len, + const char *password, + gsize *out_len, + GError **error) +{ + char *key; + guint32 digest_len; + + g_return_val_if_fail (cipher != NULL, NULL); + g_return_val_if_fail (salt != NULL, NULL); + g_return_val_if_fail (salt_len >= 8, NULL); + g_return_val_if_fail (password != NULL, NULL); + g_return_val_if_fail (out_len != NULL, NULL); + + if (!strcmp (cipher, "DES-EDE3-CBC")) + digest_len = 24; + else if (!strcmp (cipher, "DES-CBC")) + digest_len = 8; + else if (!strcmp (cipher, "AES-128-CBC")) + digest_len = 16; + else { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_UNKNOWN_CIPHER, + _("Private key cipher '%s' was unknown."), + cipher); + return NULL; + } + + if (password[0] == '\0') + return NULL; + + key = g_malloc0 (digest_len + 1); + + crypto_md5_hash (salt, + 8, + password, + strlen (password), + key, + digest_len); + + *out_len = digest_len; + return key; +} + +static GByteArray * +decrypt_key (const char *cipher, + int key_type, + const guint8 *data, + gsize data_len, + const char *iv, + const char *password, + GError **error) +{ + char *bin_iv = NULL; + gsize bin_iv_len = 0; + char *key = NULL; + gsize key_len = 0; + char *output = NULL; + gsize decrypted_len = 0; + GByteArray *decrypted = NULL; + + g_return_val_if_fail (password != NULL, NULL); + + bin_iv = convert_iv (iv, &bin_iv_len, error); + if (!bin_iv) + return NULL; + + /* Convert the password and IV into a DES or AES key */ + key = crypto_make_des_aes_key (cipher, bin_iv, bin_iv_len, password, &key_len, error); + if (!key || !key_len) + goto out; + + output = crypto_decrypt (cipher, key_type, + data, data_len, + bin_iv, bin_iv_len, + key, key_len, + &decrypted_len, + error); + if (output && decrypted_len) { + decrypted = g_byte_array_sized_new (decrypted_len); + g_byte_array_append (decrypted, (guint8 *) output, decrypted_len); + } + +out: + /* Don't leak stale key material */ + if (key) + memset (key, 0, key_len); + g_free (output); + g_free (key); + g_free (bin_iv); + + return decrypted; +} + +GByteArray * +crypto_decrypt_openssl_private_key_data (const guint8 *data, + gsize data_len, + const char *password, + NMCryptoKeyType *out_key_type, + GError **error) +{ + GByteArray *decrypted = NULL; + NMCryptoKeyType key_type = NM_CRYPTO_KEY_TYPE_UNKNOWN; + GByteArray *parsed; + char *iv = NULL; + char *cipher = NULL; + + g_return_val_if_fail (data != NULL, NULL); + if (out_key_type) + g_return_val_if_fail (*out_key_type == NM_CRYPTO_KEY_TYPE_UNKNOWN, NULL); + + if (!crypto_init (error)) + return NULL; + + parsed = parse_old_openssl_key_file (data, data_len, &key_type, &cipher, &iv, NULL); + /* return the key type even if decryption failed */ + if (out_key_type) + *out_key_type = key_type; + + if (!parsed) { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("Unable to determine private key type.")); + return NULL; + } + + if (password) { + if (!cipher || !iv) { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_PASSWORD, + _("Password provided, but key was not encrypted.")); + } else { + decrypted = decrypt_key (cipher, + key_type, + parsed->data, + parsed->len, + iv, + password, + error); + } + } else if (!cipher && !iv) + decrypted = g_byte_array_ref (parsed); + + g_byte_array_unref (parsed); + g_free (cipher); + g_free (iv); + + return decrypted; +} + +GByteArray * +crypto_decrypt_openssl_private_key (const char *file, + const char *password, + NMCryptoKeyType *out_key_type, + GError **error) +{ + GByteArray *contents; + GByteArray *key = NULL; + + if (!crypto_init (error)) + return NULL; + + contents = file_to_g_byte_array (file, error); + if (contents) { + key = crypto_decrypt_openssl_private_key_data (contents->data, contents->len, + password, out_key_type, error); + g_byte_array_free (contents, TRUE); + } + return key; +} + +static GByteArray * +extract_pem_cert_data (GByteArray *contents, GError **error) +{ + GByteArray *cert = NULL; + gsize start = 0, end = 0; + unsigned char *der = NULL; + guint8 save_end; + gsize length = 0; + + if (!find_tag (PEM_CERT_BEGIN, contents->data, contents->len, 0, &start)) { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("PEM certificate had no start tag '%s'."), + PEM_CERT_BEGIN); + goto done; + } + + start += strlen (PEM_CERT_BEGIN); + if (!find_tag (PEM_CERT_END, contents->data, contents->len, start, &end)) { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("PEM certificate had no end tag '%s'."), + PEM_CERT_END); + goto done; + } + + /* g_base64_decode() wants a NULL-terminated string */ + save_end = contents->data[end]; + contents->data[end] = '\0'; + der = g_base64_decode ((const char *) (contents->data + start), &length); + contents->data[end] = save_end; + + if (der && length) { + cert = g_byte_array_sized_new (length); + g_byte_array_append (cert, der, length); + g_assert (cert->len == length); + } else { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("Failed to decode certificate.")); + } + +done: + g_free (der); + return cert; +} + +GByteArray * +crypto_load_and_verify_certificate (const char *file, + NMCryptoFileFormat *out_file_format, + GError **error) +{ + GByteArray *array, *contents; + + g_return_val_if_fail (file != NULL, NULL); + g_return_val_if_fail (out_file_format != NULL, NULL); + g_return_val_if_fail (*out_file_format == NM_CRYPTO_FILE_FORMAT_UNKNOWN, NULL); + + if (!crypto_init (error)) + return NULL; + + contents = file_to_g_byte_array (file, error); + if (!contents) + return NULL; + + /* Check for PKCS#12 */ + if (crypto_is_pkcs12_data (contents->data, contents->len, NULL)) { + *out_file_format = NM_CRYPTO_FILE_FORMAT_PKCS12; + return contents; + } + + /* Check for plain DER format */ + if (contents->len > 2 && contents->data[0] == 0x30 && contents->data[1] == 0x82) { + *out_file_format = crypto_verify_cert (contents->data, contents->len, error); + } else { + array = extract_pem_cert_data (contents, error); + if (!array) { + g_byte_array_free (contents, TRUE); + return NULL; + } + + *out_file_format = crypto_verify_cert (array->data, array->len, error); + g_byte_array_free (array, TRUE); + } + + if (*out_file_format != NM_CRYPTO_FILE_FORMAT_X509) { + g_byte_array_free (contents, TRUE); + contents = NULL; + } + + return contents; +} + +gboolean +crypto_is_pkcs12_data (const guint8 *data, + gsize data_len, + GError **error) +{ + GError *local = NULL; + gboolean success; + + g_return_val_if_fail (data != NULL, FALSE); + + if (!crypto_init (error)) + return FALSE; + + success = crypto_verify_pkcs12 (data, data_len, NULL, &local); + if (success == FALSE) { + /* If the error was just a decryption error, then it's pkcs#12 */ + if (local) { + if (g_error_matches (local, NM_CRYPTO_ERROR, NM_CRYPTO_ERROR_DECRYPTION_FAILED)) { + success = TRUE; + g_error_free (local); + } else + g_propagate_error (error, local); + } + } + return success; +} + +gboolean +crypto_is_pkcs12_file (const char *file, GError **error) +{ + GByteArray *contents; + gboolean success = FALSE; + + g_return_val_if_fail (file != NULL, FALSE); + + if (!crypto_init (error)) + return FALSE; + + contents = file_to_g_byte_array (file, error); + if (contents) { + success = crypto_is_pkcs12_data (contents->data, contents->len, error); + g_byte_array_free (contents, TRUE); + } + return success; +} + +/* Verifies that a private key can be read, and if a password is given, that + * the private key can be decrypted with that password. + */ +NMCryptoFileFormat +crypto_verify_private_key_data (const guint8 *data, + gsize data_len, + const char *password, + gboolean *out_is_encrypted, + GError **error) +{ + GByteArray *tmp; + NMCryptoFileFormat format = NM_CRYPTO_FILE_FORMAT_UNKNOWN; + NMCryptoKeyType ktype = NM_CRYPTO_KEY_TYPE_UNKNOWN; + gboolean is_encrypted = FALSE; + + g_return_val_if_fail (data != NULL, NM_CRYPTO_FILE_FORMAT_UNKNOWN); + g_return_val_if_fail (out_is_encrypted == NULL || *out_is_encrypted == FALSE, NM_CRYPTO_FILE_FORMAT_UNKNOWN); + + if (!crypto_init (error)) + return NM_CRYPTO_FILE_FORMAT_UNKNOWN; + + /* Check for PKCS#12 first */ + if (crypto_is_pkcs12_data (data, data_len, NULL)) { + is_encrypted = TRUE; + if (!password || crypto_verify_pkcs12 (data, data_len, password, error)) + format = NM_CRYPTO_FILE_FORMAT_PKCS12; + } else { + /* Maybe it's PKCS#8 */ + tmp = parse_pkcs8_key_file (data, data_len, &is_encrypted, NULL); + if (tmp) { + if (crypto_verify_pkcs8 (tmp->data, tmp->len, is_encrypted, password, error)) + format = NM_CRYPTO_FILE_FORMAT_RAW_KEY; + } else { + char *cipher, *iv; + + /* Or it's old-style OpenSSL */ + tmp = parse_old_openssl_key_file (data, data_len, &ktype, + &cipher, &iv, NULL); + if (tmp) { + format = NM_CRYPTO_FILE_FORMAT_RAW_KEY; + is_encrypted = (cipher && iv); + g_free (cipher); + g_free (iv); + } + } + + if (tmp) { + /* Don't leave key data around */ + memset (tmp->data, 0, tmp->len); + g_byte_array_free (tmp, TRUE); + } + } + + if (out_is_encrypted) + *out_is_encrypted = is_encrypted; + return format; +} + +NMCryptoFileFormat +crypto_verify_private_key (const char *filename, + const char *password, + gboolean *out_is_encrypted, + GError **error) +{ + GByteArray *contents; + NMCryptoFileFormat format = NM_CRYPTO_FILE_FORMAT_UNKNOWN; + + g_return_val_if_fail (filename != NULL, NM_CRYPTO_FILE_FORMAT_UNKNOWN); + + if (!crypto_init (error)) + return NM_CRYPTO_FILE_FORMAT_UNKNOWN; + + contents = file_to_g_byte_array (filename, error); + if (contents) { + format = crypto_verify_private_key_data (contents->data, contents->len, password, out_is_encrypted, error); + g_byte_array_free (contents, TRUE); + } + return format; +} + +void +crypto_md5_hash (const char *salt, + gssize salt_len, + const char *password, + gssize password_len, + char *buffer, + gsize buflen) +{ + GChecksum *ctx; + int nkey = buflen; + gsize digest_len; + int count = 0; + char digest[16]; + char *p = buffer; + + g_assert_cmpint (g_checksum_type_get_length (G_CHECKSUM_MD5), ==, sizeof (digest)); + + g_return_if_fail (password_len == 0 || password); + g_return_if_fail (buffer != NULL); + g_return_if_fail (buflen > 0); + g_return_if_fail (salt_len == 0 || salt); + + ctx = g_checksum_new (G_CHECKSUM_MD5); + + if (salt_len < 0) + salt_len = strlen (salt); + if (password_len < 0) + password_len = strlen (password); + + while (nkey > 0) { + int i = 0; + + g_checksum_reset (ctx); + if (count++) + g_checksum_update (ctx, (const guchar *) digest, sizeof (digest)); + if (password_len > 0) + g_checksum_update (ctx, (const guchar *) password, password_len); + if (salt_len > 0) + g_checksum_update (ctx, (const guchar *) salt, salt_len); + + digest_len = sizeof (digest); + g_checksum_get_digest (ctx, (guchar *) digest, &digest_len); + g_assert (digest_len == sizeof (digest)); + + while (nkey && (i < sizeof (digest))) { + *(p++) = digest[i++]; + nkey--; + } + } + + memset (digest, 0, sizeof (digest)); + g_checksum_free (ctx); +} |