diff options
Diffstat (limited to 'botan/src/engine/gnump/gmp_wrap.cpp')
-rw-r--r-- | botan/src/engine/gnump/gmp_wrap.cpp | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/botan/src/engine/gnump/gmp_wrap.cpp b/botan/src/engine/gnump/gmp_wrap.cpp new file mode 100644 index 0000000..735fc70 --- /dev/null +++ b/botan/src/engine/gnump/gmp_wrap.cpp @@ -0,0 +1,98 @@ +/* +* GMP Wrapper +* (C) 1999-2007 Jack Lloyd +* +* Distributed under the terms of the Botan license +*/ + +#include <botan/gmp_wrap.h> + +#define GNU_MP_VERSION_CODE_FOR(a,b,c) ((a << 16) | (b << 8) | (c)) + +#define GNU_MP_VERSION_CODE \ + GNU_MP_VERSION_CODE_FOR(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, \ + __GNU_MP_VERSION_PATCHLEVEL) + +#if GNU_MP_VERSION_CODE < GNU_MP_VERSION_CODE_FOR(4,1,0) + #error Your GNU MP install is too old, upgrade to 4.1 or later +#endif + +namespace Botan { + +/* +* GMP_MPZ Constructor +*/ +GMP_MPZ::GMP_MPZ(const BigInt& in) + { + mpz_init(value); + if(in != 0) + mpz_import(value, in.sig_words(), -1, sizeof(word), 0, 0, in.data()); + } + +/* +* GMP_MPZ Constructor +*/ +GMP_MPZ::GMP_MPZ(const byte in[], u32bit length) + { + mpz_init(value); + mpz_import(value, length, 1, 1, 0, 0, in); + } + +/* +* GMP_MPZ Copy Constructor +*/ +GMP_MPZ::GMP_MPZ(const GMP_MPZ& other) + { + mpz_init_set(value, other.value); + } + +/* +* GMP_MPZ Destructor +*/ +GMP_MPZ::~GMP_MPZ() + { + mpz_clear(value); + } + +/* +* GMP_MPZ Assignment Operator +*/ +GMP_MPZ& GMP_MPZ::operator=(const GMP_MPZ& other) + { + mpz_set(value, other.value); + return (*this); + } + +/* +* Export the mpz_t as a bytestring +*/ +void GMP_MPZ::encode(byte out[], u32bit length) const + { + size_t dummy = 0; + mpz_export(out + (length - bytes()), &dummy, 1, 1, 0, 0, value); + } + +/* +* Return the number of significant bytes +*/ +u32bit GMP_MPZ::bytes() const + { + return ((mpz_sizeinbase(value, 2) + 7) / 8); + } + +/* +* GMP to BigInt Conversions +*/ +BigInt GMP_MPZ::to_bigint() const + { + BigInt out(BigInt::Positive, (bytes() + sizeof(word) - 1) / sizeof(word)); + size_t dummy = 0; + mpz_export(out.get_reg(), &dummy, -1, sizeof(word), 0, 0, value); + + if(mpz_sgn(value) < 0) + out.flip_sign(); + + return out; + } + +} |