2014-12-10 00:00:52 +01:00
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# NOTE
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This implementation is direct fork of Kylom's implementation. I claim no authorship over this code apart from some minor modifications.
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Please be aware this code **has not yet been reviewed**.
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ecies implements the Elliptic Curve Integrated Encryption Scheme.
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The package is designed to be compliant with the appropriate NIST
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standards, and therefore doesn't support the full SEC 1 algorithm set.
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STATUS:
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ecies should be ready for use. The ASN.1 support is only complete so
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far as to supported the listed algorithms before.
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CAVEATS
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1. CMAC support is currently not present.
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SUPPORTED ALGORITHMS
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SYMMETRIC CIPHERS HASH FUNCTIONS
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AES128 SHA-1
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AES192 SHA-224
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AES256 SHA-256
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SHA-384
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ELLIPTIC CURVE SHA-512
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P256
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P384 KEY DERIVATION FUNCTION
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P521 NIST SP 800-65a Concatenation KDF
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Curve P224 isn't supported because it does not provide a minimum security
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level of AES128 with HMAC-SHA1. According to NIST SP 800-57, the security
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level of P224 is 112 bits of security. Symmetric ciphers use CTR-mode;
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message tags are computed using HMAC-<HASH> function.
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CURVE SELECTION
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According to NIST SP 800-57, the following curves should be selected:
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+----------------+-------+
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| SYMMETRIC SIZE | CURVE |
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+----------------+-------+
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| 128-bit | P256 |
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+----------------+-------+
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| 192-bit | P384 |
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+----------------+-------+
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| 256-bit | P521 |
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+----------------+-------+
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TODO
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1. Look at serialising the parameters with the SEC 1 ASN.1 module.
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2. Validate ASN.1 formats with SEC 1.
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TEST VECTORS
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The only test vectors I've found so far date from 1993, predating AES
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and including only 163-bit curves. Therefore, there are no published
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test vectors to compare to.
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LICENSE
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ecies is released under the same license as the Go source code. See the
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LICENSE file for details.
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REFERENCES
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* SEC (Standard for Efficient Cryptography) 1, version 2.0: Elliptic
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Curve Cryptography; Certicom, May 2009.
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http://www.secg.org/sec1-v2.pdf
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2014-12-10 00:00:52 +01:00
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* GEC (Guidelines for Efficient Cryptography) 2, version 0.3: Test
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Vectors for SEC 1; Certicom, September 1999.
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http://read.pudn.com/downloads168/doc/772358/TestVectorsforSEC%201-gec2.pdf
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* NIST SP 800-56a: Recommendation for Pair-Wise Key Establishment Schemes
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Using Discrete Logarithm Cryptography. National Institute of Standards
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and Technology, May 2007.
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http://csrc.nist.gov/publications/nistpubs/800-56A/SP800-56A_Revision1_Mar08-2007.pdf
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* Suite B Implementer’s Guide to NIST SP 800-56A. National Security
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Agency, July 28, 2009.
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http://www.nsa.gov/ia/_files/SuiteB_Implementer_G-113808.pdf
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* NIST SP 800-57: Recommendation for Key Management – Part 1: General
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(Revision 3). National Institute of Standards and Technology, July
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2012.
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http://csrc.nist.gov/publications/nistpubs/800-57/sp800-57_part1_rev3_general.pdf
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