diff options
author | lloyd <[email protected]> | 2008-09-28 19:29:24 +0000 |
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committer | lloyd <[email protected]> | 2008-09-28 19:29:24 +0000 |
commit | 9bcfe627321ddc81691b835dffaa6324ac4684a4 (patch) | |
tree | fe5e8ae9813b853549558b59833022e87e83981b /src/engine/gnump/gmp_wrap.cpp | |
parent | 9822a701516396b7de4e41339faecd48ff8dc8ff (diff) |
Move all modules into src/ directory
Diffstat (limited to 'src/engine/gnump/gmp_wrap.cpp')
-rw-r--r-- | src/engine/gnump/gmp_wrap.cpp | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/src/engine/gnump/gmp_wrap.cpp b/src/engine/gnump/gmp_wrap.cpp new file mode 100644 index 000000000..4c73c2562 --- /dev/null +++ b/src/engine/gnump/gmp_wrap.cpp @@ -0,0 +1,96 @@ +/************************************************* +* GMP Wrapper Source File * +* (C) 1999-2007 Jack Lloyd * +*************************************************/ + +#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; + } + +} |