src/HOL/SPARK/Examples/RIPEMD-160/R_R.thy
author wenzelm
Sun, 06 Jan 2019 15:04:34 +0100
changeset 69605 a96320074298
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isabelle update -u path_cartouches;
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(*  Title:      HOL/SPARK/Examples/RIPEMD-160/R_R.thy
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    Author:     Fabian Immler, TU Muenchen
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Verification of the RIPEMD-160 hash function
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*)
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theory R_R
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imports RMD_Specification RMD_Lemmas
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begin
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spark_open \<open>rmd/r_r\<close>
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spark_vc function_r_r_2
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proof -
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  from \<open>0 \<le> j\<close> \<open>j \<le> 79\<close>
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  show C: ?C1
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    by (simp add: r'_def r'_list_def nth_map [symmetric, of _ _ int] del: fun_upd_apply)
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      (simp add: nth_fun_of_list_eq [of _ _ undefined] del: fun_upd_apply)
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  from C show ?C2 by simp
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  have "list_all (\<lambda>n. int n \<le> 15) r'_list"
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    by (simp add: r'_list_def)
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  moreover have "length r'_list = 80"
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    by (simp add: r'_list_def)
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  ultimately show ?C3 unfolding C using \<open>j \<le> 79\<close>
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    by (simp add: r'_def list_all_length)
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qed
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spark_end
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end