2002-01-03 2024-02-16 RFC Required or Specification Required James Manger This registry is deprecated since it lists the algorithms that can be used with the Digest and Want-Digest fields defined in , which has been obsoleted by . While registration is not closed, new registrations are encouraged to use the Hash Algorithms for HTTP Digest Fields registry instead. ADLER32 The ADLER32 algorithm is a checksum specified in RFC1950 "ZLIB Compressed Data Format". The 32-bit output is encoded in hexadecimal (using between 1 and 8 ASCII characters from 0-9, A-F, and a-f; leading 0's are allowed). For example, ADLER32=03da0195 and ADLER32=3DA0195 are both valid checksums for the 4-byte message "Wiki". CRC32c The CRC32c algorithm is a 32-bit cyclic redundancy check. It achieves a better hamming distance (for better error-detection performance) than many other 32-bit CRC functions. Other places it is used include iSCSI and SCTP. The 32-bit output is encoded in hexadecimal (using between 1 and 8 ASCII characters from 0-9, A-F, and a-f; leading 0's are allowed). For example, CRC32c=0a72a4df and crc32c=A72A4DF are both valid checksums for the 3-byte message "dog". RFC9260, Appendix A MD5 The MD5 algorithm, as specified in . The output of this algorithm is encoded using the base64 encoding . SHA The SHA-1 algorithm National Institute of Standards and Technology. Secure Hash Standard (SHS). FEDERAL INFORMATION PROCESSING STANDARDS PUBLICATION 180-3, U.S. Department of Commerce, October 2008.. The output of this algorithm is encoded using the base64 encoding . National Institute of Standards and Technology. Secure Hash Standard (SHS). FEDERAL INFORMATION PROCESSING STANDARDS PUBLICATION 180-3, U.S. Department of Commerce, October 2008. SHA-256 The SHA-256 algorithm National Institute of Standards and Technology. Secure Hash Standard (SHS). FEDERAL INFORMATION PROCESSING STANDARDS PUBLICATION 180-3, U.S. Department of Commerce, October 2008.. The output of this algorithm is encoded using the base64 encoding . National Institute of Standards and Technology. Secure Hash Standard (SHS). FEDERAL INFORMATION PROCESSING STANDARDS PUBLICATION 180-3, U.S. Department of Commerce, October 2008. SHA-512 The SHA-512 algorithm National Institute of Standards and Technology. Secure Hash Standard (SHS). FEDERAL INFORMATION PROCESSING STANDARDS PUBLICATION 180-3, U.S. Department of Commerce, October 2008.. The output of this algorithm is encoded using the base64 encoding . National Institute of Standards and Technology. Secure Hash Standard (SHS). FEDERAL INFORMATION PROCESSING STANDARDS PUBLICATION 180-3, U.S. Department of Commerce, October 2008. UNIXsum The algorithm computed by the UNIX ``sum'' command, as defined by the Single UNIX Specification, Version 2 The Open Group. The Single UNIX Specification, Version 2 - 6 Vol Set for UNIX 98. Document number T912, The Open Group, February 1997.. The output of this algorithm is an ASCII decimal-digit string representing the 16-bit checksum, which is the first word of the output of the UNIX ``sum'' command. The Open Group. The Single UNIX Specification, Version 2 - 6 Vol Set for UNIX 98. Document number T912, The Open Group, February 1997. UNIXcksum The algorithm computed by the UNIX ``cksum'' command, as defined by the Single UNIX Specification, Version 2 The Open Group. The Single UNIX Specification, Version 2 - 6 Vol Set for UNIX 98. Document number T912, The Open Group, February 1997.. The output of this algorithm is an ASCII digit string representing the 32-bit CRC, which is the first word of the output of the UNIX ``cksum'' command. The Open Group. The Single UNIX Specification, Version 2 - 6 Vol Set for UNIX 98. Document number T912, The Open Group, February 1997. Specification Required Unassigned MD5 128 SHA-512-256 256 SHA-256 256 Paul Millar mailto:paul.millar&desy.de 2012-11-06