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-rw-r--r--drivers/s390/crypto/pkey_sysfs.c648
1 files changed, 648 insertions, 0 deletions
diff --git a/drivers/s390/crypto/pkey_sysfs.c b/drivers/s390/crypto/pkey_sysfs.c
new file mode 100644
index 000000000000..cc0fc1e264bd
--- /dev/null
+++ b/drivers/s390/crypto/pkey_sysfs.c
@@ -0,0 +1,648 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * pkey module sysfs related functions
+ *
+ * Copyright IBM Corp. 2024
+ */
+
+#define KMSG_COMPONENT "pkey"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/sysfs.h>
+
+#include "zcrypt_api.h"
+#include "zcrypt_ccamisc.h"
+#include "zcrypt_ep11misc.h"
+
+#include "pkey_base.h"
+
+/*
+ * Wrapper around pkey_handler_gen_key() which deals with the
+ * ENODEV return code and then tries to enforce a pkey handler
+ * module load.
+ */
+static int sys_pkey_handler_gen_key(u32 keytype, u32 keysubtype,
+ u32 keybitsize, u32 flags,
+ u8 *keybuf, u32 *keybuflen, u32 *keyinfo)
+{
+ int rc;
+
+ rc = pkey_handler_gen_key(NULL, 0,
+ keytype, keysubtype,
+ keybitsize, flags,
+ keybuf, keybuflen, keyinfo);
+ if (rc == -ENODEV) {
+ pkey_handler_request_modules();
+ rc = pkey_handler_gen_key(NULL, 0,
+ keytype, keysubtype,
+ keybitsize, flags,
+ keybuf, keybuflen, keyinfo);
+ }
+
+ return rc;
+}
+
+/*
+ * Sysfs attribute read function for all protected key binary attributes.
+ * The implementation can not deal with partial reads, because a new random
+ * protected key blob is generated with each read. In case of partial reads
+ * (i.e. off != 0 or count < key blob size) -EINVAL is returned.
+ */
+static ssize_t pkey_protkey_aes_attr_read(u32 keytype, bool is_xts, char *buf,
+ loff_t off, size_t count)
+{
+ struct protaeskeytoken protkeytoken;
+ struct pkey_protkey protkey;
+ int rc;
+
+ if (off != 0 || count < sizeof(protkeytoken))
+ return -EINVAL;
+ if (is_xts)
+ if (count < 2 * sizeof(protkeytoken))
+ return -EINVAL;
+
+ memset(&protkeytoken, 0, sizeof(protkeytoken));
+ protkeytoken.type = TOKTYPE_NON_CCA;
+ protkeytoken.version = TOKVER_PROTECTED_KEY;
+ protkeytoken.keytype = keytype;
+
+ protkey.len = sizeof(protkey.protkey);
+ rc = sys_pkey_handler_gen_key(keytype, PKEY_TYPE_PROTKEY, 0, 0,
+ protkey.protkey, &protkey.len,
+ &protkey.type);
+ if (rc)
+ return rc;
+
+ protkeytoken.len = protkey.len;
+ memcpy(&protkeytoken.protkey, &protkey.protkey, protkey.len);
+
+ memcpy(buf, &protkeytoken, sizeof(protkeytoken));
+
+ if (is_xts) {
+ /* xts needs a second protected key, reuse protkey struct */
+ protkey.len = sizeof(protkey.protkey);
+ rc = sys_pkey_handler_gen_key(keytype, PKEY_TYPE_PROTKEY, 0, 0,
+ protkey.protkey, &protkey.len,
+ &protkey.type);
+ if (rc)
+ return rc;
+
+ protkeytoken.len = protkey.len;
+ memcpy(&protkeytoken.protkey, &protkey.protkey, protkey.len);
+
+ memcpy(buf + sizeof(protkeytoken), &protkeytoken,
+ sizeof(protkeytoken));
+
+ return 2 * sizeof(protkeytoken);
+ }
+
+ return sizeof(protkeytoken);
+}
+
+/*
+ * Sysfs attribute read function for the AES XTS prot key binary attributes.
+ * The implementation can not deal with partial reads, because a new random
+ * protected key blob is generated with each read. In case of partial reads
+ * (i.e. off != 0 or count < key blob size) -EINVAL is returned.
+ */
+static ssize_t pkey_protkey_aes_xts_attr_read(u32 keytype, char *buf,
+ loff_t off, size_t count)
+{
+ struct protkeytoken *t = (struct protkeytoken *)buf;
+ u32 protlen, prottype;
+ int rc;
+
+ switch (keytype) {
+ case PKEY_KEYTYPE_AES_XTS_128:
+ protlen = 64;
+ break;
+ case PKEY_KEYTYPE_AES_XTS_256:
+ protlen = 96;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (off != 0 || count < sizeof(*t) + protlen)
+ return -EINVAL;
+
+ memset(t, 0, sizeof(*t) + protlen);
+ t->type = TOKTYPE_NON_CCA;
+ t->version = TOKVER_PROTECTED_KEY;
+ t->keytype = keytype;
+
+ rc = sys_pkey_handler_gen_key(keytype, PKEY_TYPE_PROTKEY, 0, 0,
+ t->protkey, &protlen, &prottype);
+ if (rc)
+ return rc;
+
+ t->len = protlen;
+
+ return sizeof(*t) + protlen;
+}
+
+/*
+ * Sysfs attribute read function for the HMAC prot key binary attributes.
+ * The implementation can not deal with partial reads, because a new random
+ * protected key blob is generated with each read. In case of partial reads
+ * (i.e. off != 0 or count < key blob size) -EINVAL is returned.
+ */
+static ssize_t pkey_protkey_hmac_attr_read(u32 keytype, char *buf,
+ loff_t off, size_t count)
+{
+ struct protkeytoken *t = (struct protkeytoken *)buf;
+ u32 protlen, prottype;
+ int rc;
+
+ switch (keytype) {
+ case PKEY_KEYTYPE_HMAC_512:
+ protlen = 96;
+ break;
+ case PKEY_KEYTYPE_HMAC_1024:
+ protlen = 160;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (off != 0 || count < sizeof(*t) + protlen)
+ return -EINVAL;
+
+ memset(t, 0, sizeof(*t) + protlen);
+ t->type = TOKTYPE_NON_CCA;
+ t->version = TOKVER_PROTECTED_KEY;
+ t->keytype = keytype;
+
+ rc = sys_pkey_handler_gen_key(keytype, PKEY_TYPE_PROTKEY, 0, 0,
+ t->protkey, &protlen, &prottype);
+ if (rc)
+ return rc;
+
+ t->len = protlen;
+
+ return sizeof(*t) + protlen;
+}
+
+static ssize_t protkey_aes_128_read(struct file *filp,
+ struct kobject *kobj,
+ struct bin_attribute *attr,
+ char *buf, loff_t off,
+ size_t count)
+{
+ return pkey_protkey_aes_attr_read(PKEY_KEYTYPE_AES_128, false, buf,
+ off, count);
+}
+
+static ssize_t protkey_aes_192_read(struct file *filp,
+ struct kobject *kobj,
+ struct bin_attribute *attr,
+ char *buf, loff_t off,
+ size_t count)
+{
+ return pkey_protkey_aes_attr_read(PKEY_KEYTYPE_AES_192, false, buf,
+ off, count);
+}
+
+static ssize_t protkey_aes_256_read(struct file *filp,
+ struct kobject *kobj,
+ struct bin_attribute *attr,
+ char *buf, loff_t off,
+ size_t count)
+{
+ return pkey_protkey_aes_attr_read(PKEY_KEYTYPE_AES_256, false, buf,
+ off, count);
+}
+
+static ssize_t protkey_aes_128_xts_read(struct file *filp,
+ struct kobject *kobj,
+ struct bin_attribute *attr,
+ char *buf, loff_t off,
+ size_t count)
+{
+ return pkey_protkey_aes_attr_read(PKEY_KEYTYPE_AES_128, true, buf,
+ off, count);
+}
+
+static ssize_t protkey_aes_256_xts_read(struct file *filp,
+ struct kobject *kobj,
+ struct bin_attribute *attr,
+ char *buf, loff_t off,
+ size_t count)
+{
+ return pkey_protkey_aes_attr_read(PKEY_KEYTYPE_AES_256, true, buf,
+ off, count);
+}
+
+static ssize_t protkey_aes_xts_128_read(struct file *filp,
+ struct kobject *kobj,
+ struct bin_attribute *attr,
+ char *buf, loff_t off,
+ size_t count)
+{
+ return pkey_protkey_aes_xts_attr_read(PKEY_KEYTYPE_AES_XTS_128,
+ buf, off, count);
+}
+
+static ssize_t protkey_aes_xts_256_read(struct file *filp,
+ struct kobject *kobj,
+ struct bin_attribute *attr,
+ char *buf, loff_t off,
+ size_t count)
+{
+ return pkey_protkey_aes_xts_attr_read(PKEY_KEYTYPE_AES_XTS_256,
+ buf, off, count);
+}
+
+static ssize_t protkey_hmac_512_read(struct file *filp,
+ struct kobject *kobj,
+ struct bin_attribute *attr,
+ char *buf, loff_t off,
+ size_t count)
+{
+ return pkey_protkey_hmac_attr_read(PKEY_KEYTYPE_HMAC_512,
+ buf, off, count);
+}
+
+static ssize_t protkey_hmac_1024_read(struct file *filp,
+ struct kobject *kobj,
+ struct bin_attribute *attr,
+ char *buf, loff_t off,
+ size_t count)
+{
+ return pkey_protkey_hmac_attr_read(PKEY_KEYTYPE_HMAC_1024,
+ buf, off, count);
+}
+
+static BIN_ATTR_RO(protkey_aes_128, sizeof(struct protaeskeytoken));
+static BIN_ATTR_RO(protkey_aes_192, sizeof(struct protaeskeytoken));
+static BIN_ATTR_RO(protkey_aes_256, sizeof(struct protaeskeytoken));
+static BIN_ATTR_RO(protkey_aes_128_xts, 2 * sizeof(struct protaeskeytoken));
+static BIN_ATTR_RO(protkey_aes_256_xts, 2 * sizeof(struct protaeskeytoken));
+static BIN_ATTR_RO(protkey_aes_xts_128, sizeof(struct protkeytoken) + 64);
+static BIN_ATTR_RO(protkey_aes_xts_256, sizeof(struct protkeytoken) + 96);
+static BIN_ATTR_RO(protkey_hmac_512, sizeof(struct protkeytoken) + 96);
+static BIN_ATTR_RO(protkey_hmac_1024, sizeof(struct protkeytoken) + 160);
+
+static struct bin_attribute *protkey_attrs[] = {
+ &bin_attr_protkey_aes_128,
+ &bin_attr_protkey_aes_192,
+ &bin_attr_protkey_aes_256,
+ &bin_attr_protkey_aes_128_xts,
+ &bin_attr_protkey_aes_256_xts,
+ &bin_attr_protkey_aes_xts_128,
+ &bin_attr_protkey_aes_xts_256,
+ &bin_attr_protkey_hmac_512,
+ &bin_attr_protkey_hmac_1024,
+ NULL
+};
+
+static struct attribute_group protkey_attr_group = {
+ .name = "protkey",
+ .bin_attrs = protkey_attrs,
+};
+
+/*
+ * Sysfs attribute read function for all secure key ccadata binary attributes.
+ * The implementation can not deal with partial reads, because a new random
+ * protected key blob is generated with each read. In case of partial reads
+ * (i.e. off != 0 or count < key blob size) -EINVAL is returned.
+ */
+static ssize_t pkey_ccadata_aes_attr_read(u32 keytype, bool is_xts, char *buf,
+ loff_t off, size_t count)
+{
+ struct pkey_seckey *seckey = (struct pkey_seckey *)buf;
+ u32 buflen;
+ int rc;
+
+ if (off != 0 || count < sizeof(struct secaeskeytoken))
+ return -EINVAL;
+ if (is_xts)
+ if (count < 2 * sizeof(struct secaeskeytoken))
+ return -EINVAL;
+
+ buflen = sizeof(seckey->seckey);
+ rc = sys_pkey_handler_gen_key(keytype, PKEY_TYPE_CCA_DATA, 0, 0,
+ seckey->seckey, &buflen, NULL);
+ if (rc)
+ return rc;
+
+ if (is_xts) {
+ seckey++;
+ buflen = sizeof(seckey->seckey);
+ rc = sys_pkey_handler_gen_key(keytype, PKEY_TYPE_CCA_DATA, 0, 0,
+ seckey->seckey, &buflen, NULL);
+ if (rc)
+ return rc;
+
+ return 2 * sizeof(struct secaeskeytoken);
+ }
+
+ return sizeof(struct secaeskeytoken);
+}
+
+static ssize_t ccadata_aes_128_read(struct file *filp,
+ struct kobject *kobj,
+ struct bin_attribute *attr,
+ char *buf, loff_t off,
+ size_t count)
+{
+ return pkey_ccadata_aes_attr_read(PKEY_KEYTYPE_AES_128, false, buf,
+ off, count);
+}
+
+static ssize_t ccadata_aes_192_read(struct file *filp,
+ struct kobject *kobj,
+ struct bin_attribute *attr,
+ char *buf, loff_t off,
+ size_t count)
+{
+ return pkey_ccadata_aes_attr_read(PKEY_KEYTYPE_AES_192, false, buf,
+ off, count);
+}
+
+static ssize_t ccadata_aes_256_read(struct file *filp,
+ struct kobject *kobj,
+ struct bin_attribute *attr,
+ char *buf, loff_t off,
+ size_t count)
+{
+ return pkey_ccadata_aes_attr_read(PKEY_KEYTYPE_AES_256, false, buf,
+ off, count);
+}
+
+static ssize_t ccadata_aes_128_xts_read(struct file *filp,
+ struct kobject *kobj,
+ struct bin_attribute *attr,
+ char *buf, loff_t off,
+ size_t count)
+{
+ return pkey_ccadata_aes_attr_read(PKEY_KEYTYPE_AES_128, true, buf,
+ off, count);
+}
+
+static ssize_t ccadata_aes_256_xts_read(struct file *filp,
+ struct kobject *kobj,
+ struct bin_attribute *attr,
+ char *buf, loff_t off,
+ size_t count)
+{
+ return pkey_ccadata_aes_attr_read(PKEY_KEYTYPE_AES_256, true, buf,
+ off, count);
+}
+
+static BIN_ATTR_RO(ccadata_aes_128, sizeof(struct secaeskeytoken));
+static BIN_ATTR_RO(ccadata_aes_192, sizeof(struct secaeskeytoken));
+static BIN_ATTR_RO(ccadata_aes_256, sizeof(struct secaeskeytoken));
+static BIN_ATTR_RO(ccadata_aes_128_xts, 2 * sizeof(struct secaeskeytoken));
+static BIN_ATTR_RO(ccadata_aes_256_xts, 2 * sizeof(struct secaeskeytoken));
+
+static struct bin_attribute *ccadata_attrs[] = {
+ &bin_attr_ccadata_aes_128,
+ &bin_attr_ccadata_aes_192,
+ &bin_attr_ccadata_aes_256,
+ &bin_attr_ccadata_aes_128_xts,
+ &bin_attr_ccadata_aes_256_xts,
+ NULL
+};
+
+static struct attribute_group ccadata_attr_group = {
+ .name = "ccadata",
+ .bin_attrs = ccadata_attrs,
+};
+
+#define CCACIPHERTOKENSIZE (sizeof(struct cipherkeytoken) + 80)
+
+/*
+ * Sysfs attribute read function for all secure key ccacipher binary attributes.
+ * The implementation can not deal with partial reads, because a new random
+ * secure key blob is generated with each read. In case of partial reads
+ * (i.e. off != 0 or count < key blob size) -EINVAL is returned.
+ */
+static ssize_t pkey_ccacipher_aes_attr_read(enum pkey_key_size keybits,
+ bool is_xts, char *buf, loff_t off,
+ size_t count)
+{
+ u32 keysize = CCACIPHERTOKENSIZE;
+ int rc;
+
+ if (off != 0 || count < CCACIPHERTOKENSIZE)
+ return -EINVAL;
+ if (is_xts)
+ if (count < 2 * CCACIPHERTOKENSIZE)
+ return -EINVAL;
+
+ memset(buf, 0, is_xts ? 2 * keysize : keysize);
+
+ rc = sys_pkey_handler_gen_key(pkey_aes_bitsize_to_keytype(keybits),
+ PKEY_TYPE_CCA_CIPHER, keybits, 0,
+ buf, &keysize, NULL);
+ if (rc)
+ return rc;
+
+ if (is_xts) {
+ keysize = CCACIPHERTOKENSIZE;
+ buf += CCACIPHERTOKENSIZE;
+ rc = sys_pkey_handler_gen_key(
+ pkey_aes_bitsize_to_keytype(keybits),
+ PKEY_TYPE_CCA_CIPHER, keybits, 0,
+ buf, &keysize, NULL);
+ if (rc)
+ return rc;
+ return 2 * CCACIPHERTOKENSIZE;
+ }
+
+ return CCACIPHERTOKENSIZE;
+}
+
+static ssize_t ccacipher_aes_128_read(struct file *filp,
+ struct kobject *kobj,
+ struct bin_attribute *attr,
+ char *buf, loff_t off,
+ size_t count)
+{
+ return pkey_ccacipher_aes_attr_read(PKEY_SIZE_AES_128, false, buf,
+ off, count);
+}
+
+static ssize_t ccacipher_aes_192_read(struct file *filp,
+ struct kobject *kobj,
+ struct bin_attribute *attr,
+ char *buf, loff_t off,
+ size_t count)
+{
+ return pkey_ccacipher_aes_attr_read(PKEY_SIZE_AES_192, false, buf,
+ off, count);
+}
+
+static ssize_t ccacipher_aes_256_read(struct file *filp,
+ struct kobject *kobj,
+ struct bin_attribute *attr,
+ char *buf, loff_t off,
+ size_t count)
+{
+ return pkey_ccacipher_aes_attr_read(PKEY_SIZE_AES_256, false, buf,
+ off, count);
+}
+
+static ssize_t ccacipher_aes_128_xts_read(struct file *filp,
+ struct kobject *kobj,
+ struct bin_attribute *attr,
+ char *buf, loff_t off,
+ size_t count)
+{
+ return pkey_ccacipher_aes_attr_read(PKEY_SIZE_AES_128, true, buf,
+ off, count);
+}
+
+static ssize_t ccacipher_aes_256_xts_read(struct file *filp,
+ struct kobject *kobj,
+ struct bin_attribute *attr,
+ char *buf, loff_t off,
+ size_t count)
+{
+ return pkey_ccacipher_aes_attr_read(PKEY_SIZE_AES_256, true, buf,
+ off, count);
+}
+
+static BIN_ATTR_RO(ccacipher_aes_128, CCACIPHERTOKENSIZE);
+static BIN_ATTR_RO(ccacipher_aes_192, CCACIPHERTOKENSIZE);
+static BIN_ATTR_RO(ccacipher_aes_256, CCACIPHERTOKENSIZE);
+static BIN_ATTR_RO(ccacipher_aes_128_xts, 2 * CCACIPHERTOKENSIZE);
+static BIN_ATTR_RO(ccacipher_aes_256_xts, 2 * CCACIPHERTOKENSIZE);
+
+static struct bin_attribute *ccacipher_attrs[] = {
+ &bin_attr_ccacipher_aes_128,
+ &bin_attr_ccacipher_aes_192,
+ &bin_attr_ccacipher_aes_256,
+ &bin_attr_ccacipher_aes_128_xts,
+ &bin_attr_ccacipher_aes_256_xts,
+ NULL
+};
+
+static struct attribute_group ccacipher_attr_group = {
+ .name = "ccacipher",
+ .bin_attrs = ccacipher_attrs,
+};
+
+/*
+ * Sysfs attribute read function for all ep11 aes key binary attributes.
+ * The implementation can not deal with partial reads, because a new random
+ * secure key blob is generated with each read. In case of partial reads
+ * (i.e. off != 0 or count < key blob size) -EINVAL is returned.
+ * This function and the sysfs attributes using it provide EP11 key blobs
+ * padded to the upper limit of MAXEP11AESKEYBLOBSIZE which is currently
+ * 336 bytes.
+ */
+static ssize_t pkey_ep11_aes_attr_read(enum pkey_key_size keybits,
+ bool is_xts, char *buf, loff_t off,
+ size_t count)
+{
+ u32 keysize = MAXEP11AESKEYBLOBSIZE;
+ int rc;
+
+ if (off != 0 || count < MAXEP11AESKEYBLOBSIZE)
+ return -EINVAL;
+ if (is_xts)
+ if (count < 2 * MAXEP11AESKEYBLOBSIZE)
+ return -EINVAL;
+
+ memset(buf, 0, is_xts ? 2 * keysize : keysize);
+
+ rc = sys_pkey_handler_gen_key(pkey_aes_bitsize_to_keytype(keybits),
+ PKEY_TYPE_EP11_AES, keybits, 0,
+ buf, &keysize, NULL);
+ if (rc)
+ return rc;
+
+ if (is_xts) {
+ keysize = MAXEP11AESKEYBLOBSIZE;
+ buf += MAXEP11AESKEYBLOBSIZE;
+ rc = sys_pkey_handler_gen_key(
+ pkey_aes_bitsize_to_keytype(keybits),
+ PKEY_TYPE_EP11_AES, keybits, 0,
+ buf, &keysize, NULL);
+ if (rc)
+ return rc;
+ return 2 * MAXEP11AESKEYBLOBSIZE;
+ }
+
+ return MAXEP11AESKEYBLOBSIZE;
+}
+
+static ssize_t ep11_aes_128_read(struct file *filp,
+ struct kobject *kobj,
+ struct bin_attribute *attr,
+ char *buf, loff_t off,
+ size_t count)
+{
+ return pkey_ep11_aes_attr_read(PKEY_SIZE_AES_128, false, buf,
+ off, count);
+}
+
+static ssize_t ep11_aes_192_read(struct file *filp,
+ struct kobject *kobj,
+ struct bin_attribute *attr,
+ char *buf, loff_t off,
+ size_t count)
+{
+ return pkey_ep11_aes_attr_read(PKEY_SIZE_AES_192, false, buf,
+ off, count);
+}
+
+static ssize_t ep11_aes_256_read(struct file *filp,
+ struct kobject *kobj,
+ struct bin_attribute *attr,
+ char *buf, loff_t off,
+ size_t count)
+{
+ return pkey_ep11_aes_attr_read(PKEY_SIZE_AES_256, false, buf,
+ off, count);
+}
+
+static ssize_t ep11_aes_128_xts_read(struct file *filp,
+ struct kobject *kobj,
+ struct bin_attribute *attr,
+ char *buf, loff_t off,
+ size_t count)
+{
+ return pkey_ep11_aes_attr_read(PKEY_SIZE_AES_128, true, buf,
+ off, count);
+}
+
+static ssize_t ep11_aes_256_xts_read(struct file *filp,
+ struct kobject *kobj,
+ struct bin_attribute *attr,
+ char *buf, loff_t off,
+ size_t count)
+{
+ return pkey_ep11_aes_attr_read(PKEY_SIZE_AES_256, true, buf,
+ off, count);
+}
+
+static BIN_ATTR_RO(ep11_aes_128, MAXEP11AESKEYBLOBSIZE);
+static BIN_ATTR_RO(ep11_aes_192, MAXEP11AESKEYBLOBSIZE);
+static BIN_ATTR_RO(ep11_aes_256, MAXEP11AESKEYBLOBSIZE);
+static BIN_ATTR_RO(ep11_aes_128_xts, 2 * MAXEP11AESKEYBLOBSIZE);
+static BIN_ATTR_RO(ep11_aes_256_xts, 2 * MAXEP11AESKEYBLOBSIZE);
+
+static struct bin_attribute *ep11_attrs[] = {
+ &bin_attr_ep11_aes_128,
+ &bin_attr_ep11_aes_192,
+ &bin_attr_ep11_aes_256,
+ &bin_attr_ep11_aes_128_xts,
+ &bin_attr_ep11_aes_256_xts,
+ NULL
+};
+
+static struct attribute_group ep11_attr_group = {
+ .name = "ep11",
+ .bin_attrs = ep11_attrs,
+};
+
+const struct attribute_group *pkey_attr_groups[] = {
+ &protkey_attr_group,
+ &ccadata_attr_group,
+ &ccacipher_attr_group,
+ &ep11_attr_group,
+ NULL,
+};
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-09 03:33:31 +0100