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Many CPU design houses have added dedicated support for cryptography in recent processor generations, including Intel, IBM, and ARM. While adding accelerators and/or dedicated instructions boosts performance on cryptography, we are investigating a different approach that is not adding extra silicon area: We study to replace the hardened NEON SIMD unit of an ARM Cortex-A9 with an identical sized FPGA fabric, called an interlay. This will be used for implementing cryptographic instructions in soft-logic. We show that this approach can outperform the hardened NEON by up to 7.7× on AES and provide functionality that is not available in the hardened ARM.