CONFIG_CRYPTO_MD5_SPARC64 is not available for thedefaultarchitecture x86.
Result is shown for architecture 64BIT or sparc

Digests: MD5

modulename: md5-sparc64.ko

configname: CONFIG_CRYPTO_MD5_SPARC64

Linux Kernel Configuration
└─>Accelerated Cryptographic Algorithms for CPU (sparc64)
└─>Digests: MD5
In linux kernel since version 3.1 (release Date: 2011-10-24)  
MD5 message digest algorithm (RFC1321)

Architecture: sparc64 using crypto instructions, when available

source code:
/arch/sparc/crypto/

depends
CONFIG_SPARC64