Rendering Issue in SPDM Specifications for Key Derivation

[steven-bellock]

During symmetric key derivation an eight byte string that identifies the negotiated SPDM version is included in the derivation.

libspdm/include/industry_standard/spdm.h

Lines 1219 to 1221 in 0081c1f

	#define SPDM_VERSION_1_1_BIN_CONCAT_LABEL "spdm1.1 "
	#define SPDM_VERSION_1_2_BIN_CONCAT_LABEL "spdm1.2 "
	#define SPDM_VERSION_1_3_BIN_CONCAT_LABEL "spdm1.3 "

This string includes a space at the end so that its size is eight bytes without the C null terminator. Due to a document rendering issue, recent SPDM specifications published as PDFs do not include the space. For example SPDM 1.1.3 contains

The affected specifications are

• 1.1.3
• 1.2.2
• 1.3.0
• 1.3.1

The SPDM Working Group is working to fix this issue and republish affected specifications.

Thanks to @xiaoyuruan for reporting this issue.