diff --git a/hook/iobuf.c b/hook/iobuf.c
index cdad287..d100274 100644
--- a/hook/iobuf.c
+++ b/hook/iobuf.c
@@ -124,6 +124,31 @@ HRESULT iobuf_read_be32(struct const_iobuf *src, uint32_t *out)
     return S_OK;
 }
 
+HRESULT iobuf_read_be64(struct const_iobuf *src, uint64_t *out)
+{
+    uint64_t value;
+
+    assert(src != NULL);
+    assert(out != NULL);
+
+    if (src->pos + sizeof(uint64_t) > src->nbytes) {
+        return HRESULT_FROM_WIN32(ERROR_INSUFFICIENT_BUFFER);
+    }
+
+    value  = ((uint64_t) src->bytes[src->pos++]) << 56;
+    value |= ((uint64_t) src->bytes[src->pos++]) << 48;
+    value |= ((uint64_t) src->bytes[src->pos++]) << 40;
+    value |= ((uint64_t) src->bytes[src->pos++]) << 32;
+    value |= ((uint64_t) src->bytes[src->pos++]) << 24;
+    value |= ((uint64_t) src->bytes[src->pos++]) << 16;
+    value |= ((uint64_t) src->bytes[src->pos++]) << 8;
+    value |= ((uint64_t) src->bytes[src->pos++]);
+
+    *out = value;
+
+    return S_OK;
+}
+
 HRESULT iobuf_read_le16(struct const_iobuf *src, uint16_t *out)
 {
     uint16_t value;
@@ -164,6 +189,31 @@ HRESULT iobuf_read_le32(struct const_iobuf *src, uint32_t *out)
     return S_OK;
 }
 
+HRESULT iobuf_read_le64(struct const_iobuf *src, uint64_t *out)
+{
+    uint64_t value;
+
+    assert(src != NULL);
+    assert(out != NULL);
+
+    if (src->pos + sizeof(uint64_t) > src->nbytes) {
+        return HRESULT_FROM_WIN32(ERROR_INSUFFICIENT_BUFFER);
+    }
+
+    value  = ((uint64_t) src->bytes[src->pos++]);
+    value |= ((uint64_t) src->bytes[src->pos++]) << 8;
+    value |= ((uint64_t) src->bytes[src->pos++]) << 16;
+    value |= ((uint64_t) src->bytes[src->pos++]) << 24;
+    value |= ((uint64_t) src->bytes[src->pos++]) << 32;
+    value |= ((uint64_t) src->bytes[src->pos++]) << 40;
+    value |= ((uint64_t) src->bytes[src->pos++]) << 48;
+    value |= ((uint64_t) src->bytes[src->pos++]) << 56;
+
+    *out = value;
+
+    return S_OK;
+}
+
 HRESULT iobuf_write(struct iobuf *dest, const void *bytes, size_t nbytes)
 {
     assert(dest != NULL);
@@ -222,6 +272,26 @@ HRESULT iobuf_write_be32(struct iobuf *dest, uint32_t value)
     return S_OK;
 }
 
+HRESULT iobuf_write_be64(struct iobuf *dest, uint64_t value)
+{
+    assert(dest != NULL);
+
+    if (dest->pos + sizeof(uint64_t) > dest->nbytes) {
+        return HRESULT_FROM_WIN32(ERROR_INSUFFICIENT_BUFFER);
+    }
+
+    dest->bytes[dest->pos++] = value >> 56;
+    dest->bytes[dest->pos++] = value >> 48;
+    dest->bytes[dest->pos++] = value >> 40;
+    dest->bytes[dest->pos++] = value >> 32;
+    dest->bytes[dest->pos++] = value >> 24;
+    dest->bytes[dest->pos++] = value >> 16;
+    dest->bytes[dest->pos++] = value >> 8;
+    dest->bytes[dest->pos++] = value;
+
+    return S_OK;
+}
+
 HRESULT iobuf_write_le16(struct iobuf *dest, uint16_t value)
 {
     assert(dest != NULL);
@@ -251,3 +321,23 @@ HRESULT iobuf_write_le32(struct iobuf *dest, uint32_t value)
 
     return S_OK;
 }
+
+HRESULT iobuf_write_le64(struct iobuf *dest, uint64_t value)
+{
+    assert(dest != NULL);
+
+    if (dest->pos + sizeof(uint64_t) > dest->nbytes) {
+        return HRESULT_FROM_WIN32(ERROR_INSUFFICIENT_BUFFER);
+    }
+
+    dest->bytes[dest->pos++] = value;
+    dest->bytes[dest->pos++] = value >> 8;
+    dest->bytes[dest->pos++] = value >> 16;
+    dest->bytes[dest->pos++] = value >> 24;
+    dest->bytes[dest->pos++] = value >> 32;
+    dest->bytes[dest->pos++] = value >> 40;
+    dest->bytes[dest->pos++] = value >> 48;
+    dest->bytes[dest->pos++] = value >> 56;
+
+    return S_OK;
+}
diff --git a/hook/iobuf.h b/hook/iobuf.h
index 0a78ea5..02b726c 100644
--- a/hook/iobuf.h
+++ b/hook/iobuf.h
@@ -25,12 +25,16 @@ HRESULT iobuf_read(struct const_iobuf *src, void *bytes, size_t nbytes);
 HRESULT iobuf_read_8(struct const_iobuf *src, uint8_t *value);
 HRESULT iobuf_read_be16(struct const_iobuf *src, uint16_t *value);
 HRESULT iobuf_read_be32(struct const_iobuf *src, uint32_t *value);
+HRESULT iobuf_read_be64(struct const_iobuf *src, uint64_t *value);
 HRESULT iobuf_read_le16(struct const_iobuf *src, uint16_t *value);
 HRESULT iobuf_read_le32(struct const_iobuf *src, uint32_t *value);
+HRESULT iobuf_read_le64(struct const_iobuf *src, uint64_t *value);
 
 HRESULT iobuf_write(struct iobuf *dest, const void *bytes, size_t nbytes);
 HRESULT iobuf_write_8(struct iobuf *dest, uint8_t value);
 HRESULT iobuf_write_be16(struct iobuf *dest, uint16_t value);
 HRESULT iobuf_write_be32(struct iobuf *dest, uint32_t value);
+HRESULT iobuf_write_be64(struct iobuf *dest, uint64_t value);
 HRESULT iobuf_write_le16(struct iobuf *dest, uint16_t value);
 HRESULT iobuf_write_le32(struct iobuf *dest, uint32_t value);
+HRESULT iobuf_write_le64(struct iobuf *dest, uint64_t value);