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B.3.1. HMAC-SHA-1

B.3.1. HMAC-SHA-1​

HMAC-SHA-1 is the HMAC message authentication scheme [RFC2104] based on the SHA-1 hash function [NIST180]. HMAC-SHA-1 has a variable key length and a 20-octet (160-bit) message authentication code.

The object identifier id-hmacWithSHA1 (see Appendix B.1.1) identifies the HMAC-SHA-1 message authentication scheme. (The object identifier is the same for both the pseudorandom function and the message authentication scheme; the distinction is to be understood by context.) This object identifier is intended to be employed in the object set PBMAC1-Macs (Appendix A.5).

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