Libgcrypt at gos.i
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Libgcrypt

libgcrypt is a cryptographic library developed as a separated module of GnuPG. It can also be used independently of GnuPG, although it requires its error-reporting library.

Libgcrypt features its own multiple precision arithmetic implementation, with assembler implementations for a variety of processors, including alpha, amd64, HP PA-RISC, i386, i586, m68k, mips3, powerpc, and sparc. It also features an entropy gathering utility, coming in different versions for Unix-like and Windows machines.