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Both HMAC_DRBG using SHA-1 and HMAC_DRBG using SHA-256 are Approved algorithms in ANS X9.82 for our chosen security strength of 128 bits. However, general recommendations (see e.g. NIST SP800-57) are to use a larger hash function in preference to SHA-1. Since SHA-256 is required anyway for TLSv1.2 support, there is no code size penalty for switching HMAC_DRBG to also use SHA-256. Signed-off-by: Michael Brown <mcb30@ipxe.org>
iPXE README File Quick start guide: cd src make For any more detailed instructions, see http://ipxe.org
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