Add datasheet for SIKE (#301)

* Add tentative datasheet for SIKE

* Added submitter's website

Added submitter's website

.travis/algorithm-datasheets-check.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+
+###
+# Checks that all algorithms have an algorithm datasheet in doc/algorithms.
+###
+
+PRINT_GREEN="tput setaf 2"
+PRINT_RED="tput setaf 1"
+PRINT_RESET="tput sgr 0"
+
+# get the list of KEMs from the list of algorithm identifiers in enum OQS_KEM_alg_name in src/kem/kem.h
+KEMS=`grep 'define OQS_KEM_alg_' src/kem/kem.h | grep -v 'default' | sed -e 's/^[^"]*"//' | sed -e 's/".*$//' | tr -d '[:blank:]'`
+
+RET=0
+for kem in ${KEMS}; do
+	FOUND=`grep ${kem} docs/algorithms/*.md`
+	if [[ -z "${FOUND}" ]];
+	then
+		${PRINT_RED}
+		echo "Could not find algorithm datasheet containing '${kem}'."
+		${PRINT_RESET}
+		RET=1
+	fi
+done
+
+if [[ "${RET}" == "0" ]];
+then
+	${PRINT_GREEN}
+	echo "Algorithm datasheet present for all KEMs #defined in src/kem/kem.h.";
+	${PRINT_RESET}
+fi
+
+exit ${RET}

docs/algorithms/kem_sike.md

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+liboqs master branch algorithm datasheet: `kem_sike`
+====================================================
+
+Summary
+-------
+
+- **Name**: SIKE
+- **Algorithm type**: key encapsulation mechanism
+- **Main cryptographic assumption**: (supersingular) isogeny walk problem
+- **NIST submission URL**: https://csrc.nist.gov/CSRC/media/Projects/Post-Quantum-Cryptography/documents/round-1/submissions/SIKE.zip
+- **Submitters (to NIST competition)**: David Jao, Reza Azarderakhsh, Matthew Campagna, Craig Costello, Luca De Feo, Basil Hess, Amir Jalali, Brian Koziel, Brian LaMacchia, Patrick Longa, Michael Naehrig, Joost Renes, Vladimir Soukharev, David Urbanik
+- **Submitters' website**: http://sike.org/
+- **Added to liboqs by**: Christian Paquin
+
+Parameter sets
+--------------
+
+| Parameter set   | Security model | Claimed NIST security level | Public key size (bytes) | Secret key size (bytes) | Ciphertext size (bytes) | Shared secret size (bytes) |
+|-----------------|:--------------:|:---------------------------:|:-----------------------:|:-----------------------:|:-----------------------:|:--------------------------:|
+| Sike-p503       |     IND-CCA    |              1              |            378          |            434          |            402          |             16             |
+| Sike-p751       |     IND-CCA    |              3              |            564          |            644          |            596          |             24             |
+
+Implementation
+--------------
+
+- **Source of implementation:** https://github.com/Microsoft/PQCrypto-SIDH
+- **License:** MIT License
+- **Language:** C
+- **Constant-time:** Yes
+- **Architectures supported in liboqs master branch**: x86, x64
+
+Additional comments
+-------------------
+
+The original Sike implementation includes optimizations that are not currently being built in liboqs. See src/kem/sike/upstream/README for details.