The Vajrasamadhi-sutra is the reconstructed Sanskrit title of a Buddhist sutra ascribed to Shakyamuni Buddha but produced in Korea under the name Kumgang sammae kyong (Chinese: 金剛三昧經; pinyin: Jīngāng sānmèi jīng; Japanese: Kongō sanmaikyō), or the Adamantine Absorption Sutra.
Wonhyo wrote a commentary on the text shortly after its production called the Kumgang sammaegyong non in which he speculates that it may have been the inspiration for the Awakening of Faith in the Mahayana, which was in fact written over a hundred years earlier.
[1] The Adamantine Absorption Sutra presents itself as a fusion of all pre-existing Mahayana ideas with the Vinaya precepts that work together to give a complete system of Buddhist meditation.
The text includes quotations of Bodhidharma and references to the East Mountain Teachings of Daoxin and Hongren.
The text also includes elements of the philosophy from the Awakening of Faith in the Mahayana, specifically the notion of one mind that has an aspect of true thusness on the one hand and arising/ceasing on the other.